ipaacalib/java/test/src/ipaaca/JavaPythonTest.java

@@ -205,7 +205,7 @@ public class JavaPythonTest
         String pypr = PYTHON_PREAMBLE 
                 +"ob = ipaaca.OutputBuffer('pythonside')\n"
                 +"iu = ipaaca.Message('JavaPythonTest')\n"
-                +"iu.payload['data'] = 'Hello from Python!'\n"
+                +"iu.payload = {'data':'Hello from Python!'}\n"
                 +"time.sleep(0.1)\n"
                 +"ob.add(iu)\n";
         runPythonProgram(pypr);

ipaacalib/java/test/src/ipaaca/util/BlackboardIntegrationTest.java

+package ipaaca.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import ipaaca.Initializer;
+
+import org.junit.After;
+import org.junit.Test;
+
+import com.google.common.collect.ImmutableMap;
+
+/**
+ * Integration tests for the blackboard
+ * @author hvanwelbergen
+ */
+public class BlackboardIntegrationTest
+{
+    static
+    {
+        Initializer.initializeIpaacaRsb();
+    }
+    
+    private Blackboard bb = new Blackboard("myblackboard","blackboardx");
+    private BlackboardClient bbc;
+    
+    @After
+    public void after()
+    {
+        bb.close();
+        if(bbc!=null)
+        {
+            bbc.close();
+        }
+    }
+    
+    @Test
+    public void testGetValueFromBlackboardBeforeConnection()
+    {
+        bb.put("key1","value1");
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        assertEquals("value1", bbc.get("key1"));        
+    }
+    
+    @Test
+    public void testGetValueFromBlackboardAfterConnection() throws InterruptedException
+    {
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        bb.put("key1","value1");
+        Thread.sleep(200);
+        assertEquals("value1", bbc.get("key1"));        
+    }
+    
+    @Test
+    public void testSetValueOnBlackboard() throws InterruptedException
+    {
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        bbc.put("key2","value2");
+        Thread.sleep(300);
+        assertEquals("value2", bb.get("key2"));        
+    }
+    
+    @Test
+    public void testBlackboardUpdateHandler()throws InterruptedException
+    {
+        BlackboardUpdateListener mockListener = mock(BlackboardUpdateListener.class);
+        bb.addUpdateListener(mockListener);
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        bbc.put("key2","value2");
+        Thread.sleep(200);
+        bb.put("key2","value3");
+        verify(mockListener,times(1)).update();
+    }
+    
+    @Test
+    public void testBlackboardClientUpdateHandler() throws InterruptedException
+    {
+        BlackboardUpdateListener mockListener = mock(BlackboardUpdateListener.class);
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        bbc.addUpdateListener(mockListener);
+        bb.put("key3","value3");
+        Thread.sleep(200);
+        bbc.put("key3","value4");
+        verify(mockListener,times(2)).update();
+    }
+    
+    @Test
+    public void testSetManyValuesOnBlackboard() throws InterruptedException
+    {
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        for(int i=0;i<100;i++)
+        {
+            bbc.put("key"+i,"value"+i);
+            bb.put("key"+i,"value"+i);
+        }
+        Thread.sleep(300);
+        assertEquals("value2", bb.get("key2"));        
+        assertEquals("value3", bb.get("key3"));
+    }
+    
+    @Test
+    public void testSetValuesOnClient() throws InterruptedException
+    {
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        bbc.putAll(ImmutableMap.of("key1","value1","key2","value2"));
+        Thread.sleep(200);
+        assertEquals("value1", bb.get("key1"));        
+        assertEquals("value2", bb.get("key2"));
+    }
+    
+    @Test
+    public void testSetValuesOnBlackBoard() throws InterruptedException
+    {
+        bbc = new BlackboardClient("myblackboardclient","blackboardx");
+        bbc.waitForBlackboardConnection();
+        bb.putAll(ImmutableMap.of("key1","value1","key2","value2"));
+        Thread.sleep(200);
+        assertEquals("value1", bbc.get("key1"));        
+        assertEquals("value2", bbc.get("key2"));
+    }
+}

ipaacalib/java/test/src/ipaaca/util/ComponentNotifierIntegrationTest.java

 package ipaaca.util;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import ipaaca.AbstractIU;
 import ipaaca.HandlerFunctor;
 import ipaaca.IUEventType;
 import ipaaca.Initializer;
 import ipaaca.InputBuffer;
+import ipaaca.LocalIU;
 import ipaaca.OutputBuffer;
-import ipaaca.util.ComponentNotifier;
 
 import java.util.Set;
 
+import lombok.Getter;
+
 import org.junit.After;
 import org.junit.Test;
 
-import lombok.Getter;
-
 import com.google.common.collect.ImmutableSet;
 
 /**
@@ -29,7 +30,7 @@ public class ComponentNotifierIntegrationTest
     private ComponentNotifier notifier2;
     private InputBuffer inBuffer;
     private OutputBuffer outBuffer;
-
+    private static final String OTHER_CATEGORY="OTHER";
     static
     {
         Initializer.initializeIpaacaRsb();
@@ -67,6 +68,13 @@ public class ComponentNotifierIntegrationTest
         return new ComponentNotifier(id, "test", ImmutableSet.copyOf(sendList), ImmutableSet.copyOf(recvList), outBuffer, inBuffer);
     }
 
+    private ComponentNotifier setupCompNotifierWithOtherCategoryInputBuffer(String id, Set<String> sendList, Set<String> recvList)
+    {
+        inBuffer = new InputBuffer(id + "in", ImmutableSet.of(ComponentNotifier.NOTIFY_CATEGORY, OTHER_CATEGORY));
+        outBuffer = new OutputBuffer(id + "out");
+        return new ComponentNotifier(id, "test", ImmutableSet.copyOf(sendList), ImmutableSet.copyOf(recvList), outBuffer, inBuffer);
+    }
+    
     @Test
     public void testSelf() throws InterruptedException
     {
@@ -97,4 +105,19 @@ public class ComponentNotifierIntegrationTest
         assertEquals(1, h1.getNumCalled());
         assertEquals(1, h2.getNumCalled());
     }
+    
+    @Test
+    public void testOtherCategoryInInputBuffer() throws InterruptedException
+    {
+        notifier1 = setupCompNotifierWithOtherCategoryInputBuffer("not1", ImmutableSet.of("a1", "b1"), ImmutableSet.of("a3", "b1"));
+        MyHandlerFunctor h1 = new MyHandlerFunctor();
+        notifier1.addNotificationHandler(h1);
+        
+        OutputBuffer out = new OutputBuffer("out");
+        LocalIU iu = new LocalIU(OTHER_CATEGORY);
+        out.add(iu);
+        Thread.sleep(500);
+        assertEquals(0, h1.getNumCalled());
+        assertNotNull(inBuffer.getIU(iu.getUid()));
+    }
 }

ipaacalib/java/test/src/ipaaca/util/communication/FutureIUTest.java

+package ipaaca.util.communication;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import java.util.concurrent.TimeUnit;
+
+import org.junit.Test;
+
+import ipaaca.LocalMessageIU;
+import ipaaca.OutputBuffer;
+
+/**
+ * Unit tests for the FutureIU
+ * @author hvanwelbergen
+ *
+ */
+public class FutureIUTest
+{
+    private final OutputBuffer outBuffer = new OutputBuffer("component1");
+
+    @Test(timeout = 2000)
+    public void testSendBeforeTake() throws InterruptedException
+    {
+        FutureIU fu = new FutureIU("cat1", "status", "started");
+        LocalMessageIU message = new LocalMessageIU("cat1");
+        message.getPayload().put("status", "started");
+        outBuffer.add(message);
+        assertEquals(message.getPayload(), fu.take().getPayload());
+    }
+
+    @Test(timeout = 2000)
+    public void testSendAfterTake() throws InterruptedException
+    {
+        FutureIU fu = new FutureIU("cat1", "status", "started");
+        LocalMessageIU message = new LocalMessageIU("cat1");
+        message.getPayload().put("status", "started");
+        Runnable send = () -> {
+            try
+            {
+                Thread.sleep(1000);
+            }
+            catch (Exception e)
+            {
+                throw new RuntimeException(e);
+            }
+            outBuffer.add(message);
+        };
+        new Thread(send).start();
+        assertEquals(message.getPayload(), fu.take().getPayload());
+    }
+    
+    @Test
+    public void testInvalidKeyValue() throws InterruptedException
+    {
+        FutureIU fu = new FutureIU("cat1", "status", "started");
+        LocalMessageIU message = new LocalMessageIU("cat1");
+        message.getPayload().put("status", "cancelled");
+        assertNull(fu.take(1,TimeUnit.SECONDS));
+    }
+}

ipaacalib/java/test/src/ipaaca/util/communication/FutureIUsTest.java

+package ipaaca.util.communication;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import java.util.concurrent.TimeUnit;
+
+import org.junit.After;
+import org.junit.Test;
+
+import ipaaca.LocalMessageIU;
+import ipaaca.OutputBuffer;
+
+/**
+ * Unit tests for FutureIUs
+ * @author hvanwelbergen
+ *
+ */
+public class FutureIUsTest
+{
+    private FutureIUs fus = new FutureIUs("cat1","id");
+    private final OutputBuffer outBuffer = new OutputBuffer("component1");
+    
+    @After
+    public void cleanup()
+    {
+        fus.close();
+    }
+    
+    @Test(timeout = 2000)
+    public void testSendBeforeTake() throws InterruptedException
+    {
+        LocalMessageIU message = new LocalMessageIU("cat1");
+        message.getPayload().put("id", "id1");
+        outBuffer.add(message);
+        assertEquals(message.getPayload(), fus.take("id1").getPayload());
+    }
+    
+    @Test(timeout = 2000)
+    public void testSendAfterTake() throws InterruptedException
+    {
+        LocalMessageIU message = new LocalMessageIU("cat1");
+        message.getPayload().put("id", "id1");        
+        Runnable send = () -> {
+            try
+            {
+                Thread.sleep(1000);
+            }
+            catch (Exception e)
+            {
+                throw new RuntimeException(e);
+            }
+            outBuffer.add(message);
+        };
+        new Thread(send).start();
+        assertEquals(message.getPayload(), fus.take("id1").getPayload());    
+    }
+    
+    @Test
+    public void testNonMatchingKeyValue() throws InterruptedException
+    {
+        LocalMessageIU message = new LocalMessageIU("cat1");
+        message.getPayload().put("id", "id2");
+        outBuffer.add(message);
+        assertNull(fus.take("id1", 1,TimeUnit.SECONDS));
+    }
+    
+    @Test
+    public void testMultipleKeyValues() throws InterruptedException
+    {
+        LocalMessageIU message1 = new LocalMessageIU("cat1");
+        message1.getPayload().put("id", "id1");
+        LocalMessageIU message2 = new LocalMessageIU("cat1");
+        message2.getPayload().put("id", "id2");        
+        outBuffer.add(message2);
+        outBuffer.add(message1);
+        
+        assertEquals(message1.getPayload(), fus.take("id1").getPayload());
+        assertEquals(message2.getPayload(), fus.take("id2").getPayload());
+    }
+}

ipaacalib/proto/ipaaca.proto

@@ -2,7 +2,7 @@
 //  "Incremental Processing Architecture
 //   for Artificial Conversational Agents".	
 //
-// Copyright (c) 2009-2014 Social Cognitive Systems Group
+// Copyright (c) 2009-2022 Social Cognitive Systems Group
 //                         CITEC, Bielefeld University	
 //
 // http://opensource.cit-ec.de/projects/ipaaca/
@@ -28,72 +28,150 @@
 // Forschungsgemeinschaft (DFG) in the context of the German
 // Excellence Initiative.
 
+syntax = "proto2";
+
 package ipaaca.protobuf;
 
+enum TransportMessageType {
+    WireTypeRESERVED = 0;
+    WireTypeIntMessage = 1;
+    WireTypeRemoteRequestResult = 2;
+    WireTypeIU = 3;
+    WireTypeMessageIU = 4; // special case on the wire (use other converter)
+    WireTypeIUPayloadUpdate = 5;
+    WireTypeIULinkUpdate = 6;
+    WireTypeIURetraction = 7;
+    WireTypeIUCommission = 8;
+    WireTypeIUResendRequest = 9;
+    WireTypeIUPayloadUpdateRequest = 100;
+    WireTypeIUCommissionRequest = 101;
+    WireTypeIULinkUpdateRequest = 102;
+}
+
+
+
+message TransportLevelWrapper {
+    required TransportMessageType transport_message_type = 1;
+    required bytes raw_message = 2;
+}
+
 message IntMessage {
-	required sint32 value = 1;
+    required sint32 value = 1;
 }
 
 message LinkSet {
-	required string type = 1;
-	repeated string targets = 2;
+    required string type = 1;
+    repeated string targets = 2;
 }
 
 message PayloadItem {
-	required string key = 1;
-	required string value = 2;
-	required string type = 3 [default = "str"];
+    required string key = 1;
+    required string value = 2;
+    required string type = 3 [default = "str"];
 }
 
 message IU {
-	enum AccessMode {
-		PUSH = 0;
-		REMOTE = 1;
-		MESSAGE = 2;
-	}
-
-	required string uid  = 1;
-	required uint32 revision = 2;
-	required string category = 3 [default = "undef"];
-	required string payload_type = 4 [default = "MAP"];
-	required string owner_name = 5;
-	required bool committed = 6 [default = false];
-	required AccessMode access_mode = 7 [default = PUSH];
-	required bool read_only = 8 [default = false];
-	repeated PayloadItem payload = 9;
-	repeated LinkSet links = 10;
+    enum AccessMode {
+        PUSH = 0;
+        REMOTE = 1;
+        MESSAGE = 2;
+    }
+
+    required string uid  = 1;
+    required uint32 revision = 2;
+    required string category = 3 [default = "undef"];
+    required string payload_type = 4 [default = "MAP"];
+    required string owner_name = 5;
+    required bool committed = 6 [default = false];
+    required AccessMode access_mode = 7 [default = PUSH];
+    required bool read_only = 8 [default = false];
+    repeated PayloadItem payload = 9;
+    repeated LinkSet links = 10;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
 }
 
 message IUPayloadUpdate {
-	required string uid = 1;
-	required uint32 revision = 2;
-	repeated PayloadItem new_items = 3;
-	repeated string keys_to_remove = 4;
-	required bool is_delta = 5 [default = false];
-	required string writer_name = 6;
+    required string uid = 1;
+    required uint32 revision = 2;
+    repeated PayloadItem new_items = 3;
+    repeated string keys_to_remove = 4;
+    required bool is_delta = 5 [default = false];
+    required string writer_name = 6;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
 }
 
 message IURetraction {
-	required string uid = 1;
-	required uint32 revision = 2;
+    required string uid = 1;
+    required uint32 revision = 2;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
 }
 
 message IUCommission {
-	required string uid = 1;
-	required uint32 revision = 2;
-	required string writer_name = 3;
+    required string uid = 1;
+    required uint32 revision = 2;
+    required string writer_name = 3;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
+}
+
+message IULinkUpdate {
+    required string uid = 1;
+    required uint32 revision = 2;
+    repeated LinkSet new_links = 3;
+    repeated LinkSet links_to_remove = 4;
+    required bool is_delta = 5 [default = false];
+    required string writer_name = 6;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
 }
 
 message IUResendRequest {
-	required string uid = 1;
-	required string hidden_scope_name = 2;
+    required string uid = 1;
+    required string hidden_scope_name = 2;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
 }
 
-message IULinkUpdate {
-	required string uid = 1;
-	required uint32 revision = 2;
-	repeated LinkSet new_links = 3;
-	repeated LinkSet links_to_remove = 4;
-	required bool is_delta = 5 [default = false];
-	required string writer_name = 6;
+// Result for remote operations (below).
+//  Used to send a raw int, which was problematic.
+//  Usually: 0 = Failed, >0 = new revision of successfully modified resource.
+message RemoteRequestResult {
+    required uint32 result = 1;
+    optional string request_uid = 100 [default = ""];
+    //optional string request_endpoint = 101 [default = ""];
+}
+
+// Remote / request versions of buffer setters:
+//  they just go with a dedicated ID
+message IUPayloadUpdateRequest {
+    required string uid = 1;
+    required uint32 revision = 2;
+    repeated PayloadItem new_items = 3;
+    repeated string keys_to_remove = 4;
+    required bool is_delta = 5 [default = false];
+    required string writer_name = 6;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
 }
+message IUCommissionRequest {
+    required string uid = 1;
+    required uint32 revision = 2;
+    required string writer_name = 3;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
+}
+
+message IULinkUpdateRequest {
+    required string uid = 1;
+    required uint32 revision = 2;
+    repeated LinkSet new_links = 3;
+    repeated LinkSet links_to_remove = 4;
+    required bool is_delta = 5 [default = false];
+    required string writer_name = 6;
+    optional string request_uid = 100 [default = ""];
+    optional string request_endpoint = 101 [default = ""];
+}
+

ipaacalib/python/build.xml

@@ -7,7 +7,7 @@
      <exec executable="protoc">
         <arg value="--proto_path=../proto" />
         <arg value="../proto/ipaaca.proto" />
-        <arg value="--python_out=build/" />
+		<arg value="--python_out=src/ipaaca/" />
      </exec>
    </target>
 </project>

ipaacalib/python/ivy.xml

@@ -5,8 +5,6 @@
    </publications>
    <dependencies>
       <dependency org="google" name="protobuf-python" rev="latest.release"/>
-      <dependency org="rsb" name="rsb-python" rev="latest.release"/>
-            <dependency org="spread" name="spread" rev="latest.release"/>
    </dependencies>
 
 </ivy-module>

ipaacalib/python/setup.py

+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+"""
+Created on Fri Sep  9 14:12:05 2016
+
+@author: jpoeppel
+"""
+
+from setuptools import setup
+
+import os
+import sys
+import subprocess
+
+from os import path as op 
+from distutils.spawn import find_executable
+from setuptools.command.build_py import build_py
+from setuptools.command.bdist_egg import bdist_egg
+from distutils.command.build import build
+from distutils.command.sdist import sdist
+
+class ProtoBuild(build_py):
+    """
+    This command automatically compiles all .proto files with `protoc` compiler
+    and places generated files near them -- i.e. in the same directory.
+    """
+
+    def find_protoc(self):
+        "Locates protoc executable"
+
+        if 'PROTOC' in os.environ and os.path.exists(os.environ['PROTOC']):
+            protoc = os.environ['PROTOC']
+        else:
+            protoc = find_executable('protoc')
+
+        if protoc is None:
+            sys.stderr.write('protoc not found. Is protobuf-compiler installed? \n'
+                             'Alternatively, you can point the PROTOC environment variable at a local version.')
+            sys.exit(1)
+
+        return protoc
+
+    def run(self):
+        #TODO determine path automaticall
+        packagedir = "../proto"
+        print("running build proto")
+        for protofile in filter(lambda x: x.endswith('.proto'), os.listdir(packagedir)):
+            source = op.join(packagedir, protofile)
+            output = source.replace('.proto', '_pb2.py')
+
+            if (not op.exists(output) or (op.getmtime(source) > op.getmtime(output))):
+                sys.stderr.write('Protobuf-compiling ' + source + '\n')
+                subprocess.check_call([self.find_protoc(), "-I={}".format(packagedir),'--python_out=./src/ipaaca', source])
+
+class BDist_egg(bdist_egg):
+    '''
+    Simple wrapper around the normal bdist_egg command to require
+    protobuf build before normal build.
+
+    .. codeauthor:: jwienke
+
+    '''
+
+    def run(self):
+        self.run_command('build_proto')
+        bdist_egg.run(self)
+
+
+class Build(build):
+    '''
+    Simple wrapper around the normal build command to require protobuf build
+    before normal build.
+
+    .. codeauthor:: jwienke
+    '''
+
+    def run(self):
+        self.run_command('build_proto')
+        build.run(self)
+
+
+class Sdist(sdist):
+    '''
+    Simple wrapper around the normal sdist command to require protobuf build
+    before generating the source distribution..
+
+    .. codeauthor:: jwienke
+    '''
+
+    def run(self):
+        # fetch the protocol before building the source distribution so that
+        # we have a cached version and each user can rebuild the protocol
+        # with his own protobuf version
+        self.run_command('build_proto')
+        sdist.run(self)
+
+
+version = "0.1.3" #TODO determine correct version! ideally from git, maybe do something similar to rsb/setup.py
+
+        
+setup(name="ipaaca",
+      version=version,
+      author="Hendrik Buschmeier, Ramin Yaghoubzadeh, Sören Klett",
+      author_email="hbuschme@uni-bielefeld.de,ryaghoubzadeh@uni-bielefeld.de,sklett@techfak.uni-bielefeld.de",
+      license='LGPLv3+',
+      url='https://opensource.cit-ec.de/projects/ipaaca',
+      install_requires=["paho-mqtt", "six", "protobuf"],
+      packages=["ipaaca", "ipaaca.util"],
+      package_dir={"ipaaca":"src/ipaaca"},  
+
+# TODO Do we want to add ipaaca_pb2.py to the egg or as separate package?
+#      data_files=[("./ipaaca", ["ipaaca_pb2.py"])],
+                  
+#      dependency_links=[
+#          'http://www.spread.org/files/'
+#          'SpreadModule-1.5spread4.tgz#egg=SpreadModule-1.5spread4'],
+
+      cmdclass ={
+                 "build_proto": ProtoBuild,
+                 "sdist": Sdist,
+                 "build": Build,
+                 "bdist_egg":BDist_egg
+                 }
+        
+      )

ipaacalib/python/src/informer.py

@@ -4,7 +4,7 @@
 #  "Incremental Processing Architecture
 #   for Artificial Conversational Agents".	
 #
-# Copyright (c) 2009-2013 Sociable Agents Group
+# Copyright (c) 2009-2022 Sociable Agents Group
 #                         CITEC, Bielefeld University	
 #
 # http://opensource.cit-ec.de/projects/ipaaca/
@@ -36,7 +36,7 @@ import ipaaca
 
 def remote_change_dumper(iu, event_type, local):
 	if local:
-		print 'remote side '+event_type+': '+str(iu)
+		print('remote side '+event_type+': '+str(iu))
 
 
 ob = ipaaca.OutputBuffer('CoolInformerOut')

ipaacalib/python/src/ipaaca/.gitignore

+*_pb2.py
+

ipaacalib/python/src/ipaaca/__init__.py

@@ -4,7 +4,7 @@
 #  "Incremental Processing Architecture
 #   for Artificial Conversational Agents".
 #
-# Copyright (c) 2009-2014 Social Cognitive Systems Group
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
 #                         CITEC, Bielefeld University
 #
 # http://opensource.cit-ec.de/projects/ipaaca/
@@ -32,10 +32,13 @@
 
 from __future__ import division, print_function
 
-import rsb
-import rsb.converter
+import os
+import threading
 
-import ipaaca_pb2
+#import rsb
+#import rsb.converter
+
+import ipaaca.ipaaca_pb2
 import ipaaca.converter
 from ipaaca.buffer import InputBuffer, OutputBuffer
 from ipaaca.exception import *
@@ -43,47 +46,77 @@ from ipaaca.iu import IU, Message, IUAccessMode, IUEventType
 from ipaaca.misc import enable_logging, IpaacaArgumentParser
 from ipaaca.payload import Payload
 
+import ipaaca.backend
 
-def initialize_ipaaca_rsb():
-	''''Register own RSB Converters and initialise RSB from default config file.'''
-	rsb.converter.registerGlobalConverter(
-		ipaaca.converter.IntConverter(
-			wireSchema="int32",
-			dataType=int))
-
-	rsb.converter.registerGlobalConverter(
-		ipaaca.converter.IUConverter(
-			wireSchema="ipaaca-iu",
-			dataType=IU))
-
-	rsb.converter.registerGlobalConverter(
-		ipaaca.converter.MessageConverter(
-			wireSchema="ipaaca-messageiu",
-			dataType=Message))
-
-	rsb.converter.registerGlobalConverter(
-		ipaaca.converter.IULinkUpdateConverter(
-			wireSchema="ipaaca-iu-link-update",
-			dataType=converter.IULinkUpdate))
+#
+# ipaaca.exit(int_retval)
+#
+from ipaaca.buffer import atexit_cleanup_function
 
-	rsb.converter.registerGlobalConverter(
-		ipaaca.converter.IUPayloadUpdateConverter(
-			wireSchema="ipaaca-iu-payload-update",
-			dataType=converter.IUPayloadUpdate))
+def exit(int_retval=0):
+    '''For the time being, this function can be used to
+    circumvent any sys.exit blocks, while at the same time
+    cleaning up the buffers (e.g. retracting IUs).
 
-	rsb.converter.registerGlobalConverter(
-		rsb.converter.ProtocolBufferConverter(
-			messageClass=ipaaca_pb2.IUCommission))
+    Call once at the end of any python script (or anywhere
+    in lieu of sys.exit() / os._exit(). '''
+    print('ipaaca: cleaning up and exiting with code '+str(int_retval))
+    atexit_cleanup_function()
+    os._exit(int_retval)
 
-	rsb.converter.registerGlobalConverter(
-		rsb.converter.ProtocolBufferConverter(
-			messageClass=ipaaca_pb2.IUResendRequest))
+__RSB_INITIALIZER_LOCK = threading.Lock()
+__RSB_INITIALIZED = False
 
-	rsb.converter.registerGlobalConverter(
-		rsb.converter.ProtocolBufferConverter(
-			messageClass=ipaaca_pb2.IURetraction))
 
-	rsb.__defaultParticipantConfig = rsb.ParticipantConfig.fromDefaultSources()
+def initialize_ipaaca_rsb_if_needed():
+    """Initialise rsb if not yet initialise.
 
-# Initialise module
-initialize_ipaaca_rsb()
+       * Register own RSB converters.
+       * Initialise RSB from enviroment variables, rsb config file, or
+         from default values for RSB trnasport, host, and port (via
+         ipaaca.defaults or ipaaca.misc.IpaacaArgumentParser).
+    """
+    global __RSB_INITIALIZED
+    with __RSB_INITIALIZER_LOCK:
+        if __RSB_INITIALIZED:
+            return
+        else:
+            ipaaca.converter.register_global_converter(
+                ipaaca.converter.IUConverter(
+                    wireSchema="ipaaca-iu",
+                    dataType=IU))
+            ipaaca.converter.register_global_converter(
+                ipaaca.converter.MessageConverter(
+                    wireSchema="ipaaca-messageiu",
+                    dataType=Message))
+            ipaaca.converter.register_global_converter(
+                ipaaca.converter.IULinkUpdateConverter(
+                    wireSchema="ipaaca-iu-link-update",
+                    dataType=converter.IULinkUpdate))
+            ipaaca.converter.register_global_converter(
+                ipaaca.converter.IUPayloadUpdateConverter(
+                    wireSchema="ipaaca-iu-payload-update",
+                    dataType=converter.IUPayloadUpdate))
+            if ipaaca.defaults.IPAACA_DEFAULT_RSB_TRANSPORT is not None:
+                if ipaaca.defaults.IPAACA_DEFAULT_RSB_TRANSPORT == 'spread':
+                    os.environ['RSB_TRANSPORT_SPREAD_ENABLED'] = str(1)
+                    os.environ['RSB_TRANSPORT_SOCKET_ENABLED'] = str(0)
+                elif ipaaca.defaults.IPAACA_DEFAULT_RSB_TRANSPORT == 'socket':
+                    os.environ['RSB_TRANSPORT_SPREAD_ENABLED'] = str(0)
+                    os.environ['RSB_TRANSPORT_SOCKET_ENABLED'] = str(1)
+                    if ipaaca.defaults.IPAACA_DEFAULT_RSB_SOCKET_SERVER is not None:
+                        os.environ['RSB_TRANSPORT_SOCKET_SERVER'] = str(
+                            ipaaca.defaults.IPAACA_DEFAULT_RSB_SOCKET_SERVER)
+            if ipaaca.defaults.IPAACA_DEFAULT_RSB_HOST is not None:
+                os.environ['RSB_TRANSPORT_SPREAD_HOST'] = str(
+                    ipaaca.defaults.IPAACA_DEFAULT_RSB_HOST)
+                os.environ['RSB_TRANSPORT_SOCKET_HOST'] = str(
+                    ipaaca.defaults.IPAACA_DEFAULT_RSB_HOST)
+            if ipaaca.defaults.IPAACA_DEFAULT_RSB_PORT is not None:
+                os.environ['RSB_TRANSPORT_SPREAD_PORT'] = str(
+                        ipaaca.defaults.IPAACA_DEFAULT_RSB_PORT)
+                os.environ['RSB_TRANSPORT_SOCKET_PORT'] = str(
+                        ipaaca.defaults.IPAACA_DEFAULT_RSB_PORT)
+            #
+            ipaaca.backend.register_backends()
+            __RSB_INITIALIZED = True

ipaacalib/python/src/ipaaca/backend.py

+# -*- coding: utf-8 -*-
+
+# This file is part of IPAACA, the
+#  "Incremental Processing Architecture
+#   for Artificial Conversational Agents".
+#
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
+#                         CITEC, Bielefeld University
+#
+# http://opensource.cit-ec.de/projects/ipaaca/
+# http://purl.org/net/ipaaca
+#
+# This file may be licensed under the terms of of the
+# GNU Lesser General Public License Version 3 (the ``LGPL''),
+# or (at your option) any later version.
+#
+# Software distributed under the License is distributed
+# on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+# express or implied. See the LGPL for the specific language
+# governing rights and limitations.
+#
+# You should have received a copy of the LGPL along with this
+# program. If not, go to http://www.gnu.org/licenses/lgpl.html
+# or write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# The development of this software was supported by the
+# Excellence Cluster EXC 277 Cognitive Interaction Technology.
+# The Excellence Cluster EXC 277 is a grant of the Deutsche
+# Forschungsgemeinschaft (DFG) in the context of the German
+# Excellence Initiative.
+
+from __future__ import division, print_function
+
+import ipaaca.defaults
+import ipaaca.exception
+import ipaaca.iu
+import ipaaca.misc
+import ipaaca.converter
+
+import threading
+import uuid
+import os
+import time
+
+LOGGER = ipaaca.misc.get_library_logger()
+
+__registered_backends = {}
+__backend_registration_done = False
+
+def register_backends():
+    global __registered_backends
+    global __backend_registration_done
+    if not __backend_registration_done:
+        __backend_registration_done = True
+        LOGGER.debug('Registering available back-ends')
+        # register available backends
+        # mqtt
+        import ipaaca.backend_mqtt
+        be = ipaaca.backend_mqtt.create_backend()
+        if be is not None:
+            __registered_backends[be.name] = be
+            LOGGER.debug('Back-end '+str(be.name)+' added')
+
+        # ros
+        import ipaaca.backend_ros
+        be = ipaaca.backend_ros.create_backend()
+        if be is not None:
+            __registered_backends[be.name] = be
+            LOGGER.debug('Back-end '+str(be.name)+' added')
+
+def get_default_backend():
+    # TODO selection mechanism / config
+    if not __backend_registration_done:
+        register_backends()
+    if len(__registered_backends) == 0:
+        raise RuntimeError('No back-ends could be initialized for ipaaca-python')
+    cfg = ipaaca.config.get_global_config()
+    preferred = cfg.get_with_default('backend', None)
+    if preferred is None:
+        k = list(__registered_backends.keys())[0]
+        if len(__registered_backends) > 1:
+            LOGGER.warning('No preferred ipaaca.backend set, returning one of several (probably the first in list)')
+            print('Using randomly selected back-end {}!'.format(k))
+    else:
+        if preferred in __registered_backends:
+            k = preferred
+        else:
+            raise ipaaca.exception.BackendInitializationError(preferred)
+    LOGGER.info('Back-end is '+str(k))
+    return __registered_backends[k]
+
+

ipaacalib/python/src/ipaaca/backend_mqtt.py

+# -*- coding: utf-8 -*-
+
+# This file is part of IPAACA, the
+#  "Incremental Processing Architecture
+#   for Artificial Conversational Agents".
+#
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
+#                         CITEC, Bielefeld University
+#
+# http://opensource.cit-ec.de/projects/ipaaca/
+# http://purl.org/net/ipaaca
+#
+# This file may be licensed under the terms of of the
+# GNU Lesser General Public License Version 3 (the ``LGPL''),
+# or (at your option) any later version.
+#
+# Software distributed under the License is distributed
+# on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+# express or implied. See the LGPL for the specific language
+# governing rights and limitations.
+#
+# You should have received a copy of the LGPL along with this
+# program. If not, go to http://www.gnu.org/licenses/lgpl.html
+# or write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# The development of this software was supported by the
+# Excellence Cluster EXC 277 Cognitive Interaction Technology.
+# The Excellence Cluster EXC 277 is a grant of the Deutsche
+# Forschungsgemeinschaft (DFG) in the context of the German
+# Excellence Initiative.
+
+from __future__ import division, print_function
+
+import collections
+
+import ipaaca.ipaaca_pb2
+import ipaaca.defaults
+import ipaaca.exception
+import ipaaca.iu
+import ipaaca.misc
+import ipaaca.converter
+import ipaaca.backend
+import ipaaca.config
+
+import threading
+try:
+    import queue
+except:
+    import Queue as queue
+import uuid
+import os
+import time
+
+try:
+    import paho.mqtt.client as mqtt
+    MQTT_ENABLED = True
+except:
+    MQTT_ENABLED = False
+
+if not MQTT_ENABLED:
+    def create_backend():
+        return None
+else:
+    def create_backend():
+        return MQTTBackend(name='mqtt')
+    
+    LOGGER = ipaaca.misc.get_library_logger()
+
+    _REMOTE_SERVER_MAX_QUEUED_REQUESTS = -1 # unlimited
+    _REMOTE_LISTENER_MAX_QUEUED_EVENTS = 1024 # 'Full' exception if exceeded
+
+    class EventWrapper(object):
+        def __init__(self, data):
+            self.data = data
+
+    class PendingRequest(object):
+        '''Encapsulation of a pending remote request with
+        a facility to keep the requesting thread locked
+        until the reply or a timeout unlocks it.'''
+        def __init__(self, request):
+            self._request = request
+            self._event = threading.Event()
+            self._reply = None
+            self._request_uid = str(uuid.uuid4())[0:8]
+        def wait_for_reply(self, timeout=30.0):
+            wr = self._event.wait(timeout)
+            return None if wr is False else self._reply
+        def reply_with_result(self, reply):
+            self._reply = reply
+            self._event.set()
+            
+    class Informer(object):
+        '''Informer interface, wrapping an outbound port to MQTT'''
+        def __init__(self, scope, config=None):
+            self._scope = scope
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._handlers = []
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + scope
+            self._mqtt_client = mqtt.Client(self._client_id)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = int(config.get_with_default('transport.mqtt.port', 1883, warn=True))
+            self._mqtt_client.on_connect = self.mqtt_callback_on_connect
+            self._mqtt_client.on_disconnect = self.mqtt_callback_on_disconnect
+            self._mqtt_client.on_message = self.mqtt_callback_on_message
+            self._mqtt_client.on_subscribe = self.mqtt_callback_on_subscribe
+            #self._mqtt_client.on_publish = self.mqtt_callback_on_publish
+            self.run_in_background()
+        def deactivate(self):
+            pass
+        def deactivate_internal(self):
+            self._mqtt_client.disconnect()
+            self._mqtt_client = None
+        def run_in_background(self):
+            if not self._running:
+                self._running = True
+                self._mqtt_client.loop_start()
+                self._mqtt_client.connect(self._host, self._port)
+        def mqtt_callback_on_connect(self, client, userdata, flags, rc):
+            if rc > 0:
+                LOGGER.warning('MQTT connect failed, result code ' + str(rc))
+            else:
+                self._live = True
+                self._live_event.set()
+        def mqtt_callback_on_subscribe(self, client, userdata, mid, granted_qos):
+            # TODO should / could track how many / which topics have been granted
+            if any(q != 2 for q in granted_qos):
+                LOGGER.warning('MQTT subscription did not obtain QoS level 2')
+        def mqtt_callback_on_disconnect(self, client, userdata, rc):
+            LOGGER.warning('MQTT disconnect for '+str(self._scope)+' with result code '+str(rc))
+        def mqtt_callback_on_message(self, client, userdata, message):
+            pass
+        def publishData(self, data):
+            #print('Informer publishing '+str(data.__class__.__name__)+' on '+self._scope)
+            self._mqtt_client.publish(self._scope, ipaaca.converter.serialize(data), qos=2)
+
+    class BackgroundEventDispatcher(threading.Thread):
+        def __init__(self, listener):
+            super(BackgroundEventDispatcher, self).__init__()
+            self.daemon = True
+            self._listener = listener
+        def terminate(self):
+            self._running = False
+        def run(self):
+            self._running = True
+            listener = self._listener
+            while self._running: # auto-terminated (daemon)
+                event = listener._event_queue.get(block=True, timeout=None)
+                if event is None: return # signaled termination
+                #print('\033[31mDispatch '+str(event.data.__class__.__name__)+' start ...\033[m')
+                for handler in self._listener._handlers:
+                    handler(event)
+                #print('\033[32m... dispatch '+str(event.data.__class__.__name__)+' end.\033[m')
+
+    class Listener(object):
+        '''Listener interface, wrapping an inbound port from MQTT'''
+        def __init__(self, scope, config=None):
+            self._scope = scope
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._handlers = []
+            self._event_queue = queue.Queue(_REMOTE_LISTENER_MAX_QUEUED_EVENTS)
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + scope
+            self._mqtt_client = mqtt.Client(self._client_id)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = int(config.get_with_default('transport.mqtt.port', 1883, warn=True))
+            self._mqtt_client.on_connect = self.mqtt_callback_on_connect
+            self._mqtt_client.on_disconnect = self.mqtt_callback_on_disconnect
+            self._mqtt_client.on_message = self.mqtt_callback_on_message
+            self._mqtt_client.on_subscribe = self.mqtt_callback_on_subscribe
+            #self._mqtt_client.on_socket_open = self.mqtt_callback_on_socket_open
+            #self._mqtt_client.on_socket_close = self.mqtt_callback_on_socket_close
+            #self._mqtt_client.on_log = self.mqtt_callback_on_log
+            #self._mqtt_client.on_publish = self.mqtt_callback_on_publish
+            self._dispatcher = BackgroundEventDispatcher(self)
+            self._dispatcher.start()
+            self.run_in_background()
+        def deactivate(self):
+            pass
+        def deactivate_internal(self):
+            self._event_queue.put(None, block=False) # signal termination, waking queue
+            self._dispatcher.terminate()
+            self._mqtt_client.disconnect()
+            self._mqtt_client = None
+        def run_in_background(self):
+            if not self._running:
+                self._running = True
+                self._mqtt_client.loop_start()
+                LOGGER.debug('Connect to '+str(self._host)+':'+str(self._port))
+                self._mqtt_client.connect(self._host, self._port)
+        #def mqtt_callback_on_log(self, client, userdata, level, buf):
+        #    print('Listener: LOG: '+str(buf))
+        def mqtt_callback_on_connect(self, client, userdata, flags, rc):
+            if rc > 0:
+                LOGGER.warning('MQTT connect failed, result code ' + str(rc))
+            else:
+                self._mqtt_client.subscribe(self._scope, qos=2)
+        def mqtt_callback_on_subscribe(self, client, userdata, mid, granted_qos):
+            # TODO should / could track how many / which topics have been granted
+            if any(q != 2 for q in granted_qos):
+                LOGGER.warning('MQTT subscription did not obtain QoS level 2')
+            self._live = True
+            self._live_event.set()
+        def mqtt_callback_on_disconnect(self, client, userdata, rc):
+            LOGGER.warning('MQTT disconnect for '+str(self._scope)+' with result code '+str(rc))
+        def mqtt_callback_on_message(self, client, userdata, message):
+            event = EventWrapper(ipaaca.converter.deserialize(message.payload))
+            self._event_queue.put(event, block=False) # queue event for BackgroundEventDispatcher
+        def addHandler(self, handler):
+            self._handlers.append(handler)
+        #def publishData(self, data):
+        #    self._mqtt_client.publish(self._
+
+    class LocalServer(object):
+        '''LocalServer interface, allowing for RPC requests to
+        IU functions, or reporting back success or failure.'''
+        def __init__(self, buffer_impl, scope, config=None):
+            self._buffer = buffer_impl
+            self._scope = scope
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._pending_requests_lock = threading.Lock()
+            self._pending_requests = {}
+            self._uuid = str(uuid.uuid4())[0:8]
+            self._name = 'PID_' + str(os.getpid()) + '_LocalServer_' + self._uuid # unused atm
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + scope
+            self._mqtt_client = mqtt.Client(self._client_id)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = int(config.get_with_default('transport.mqtt.port', 1883, warn=True))
+            self._mqtt_client.on_connect = self.mqtt_callback_on_connect
+            self._mqtt_client.on_disconnect = self.mqtt_callback_on_disconnect
+            self._mqtt_client.on_message = self.mqtt_callback_on_message
+            self._mqtt_client.on_subscribe = self.mqtt_callback_on_subscribe
+            #self._mqtt_client.on_publish = self.mqtt_callback_on_publish
+            self.run_in_background()
+        def deactivate(self):
+            pass
+        def deactivate_internal(self):
+            self._mqtt_client.disconnect()
+            self._mqtt_client = None
+        def run_in_background(self):
+            if not self._running:
+                self._running = True
+                self._mqtt_client.loop_start()
+                self._mqtt_client.connect(self._host, self._port)
+        def mqtt_callback_on_connect(self, client, userdata, flags, rc):
+            if rc > 0:
+                LOGGER.warning('MQTT connect failed, result code ' + str(rc))
+            else:
+                self._mqtt_client.subscribe(self._scope, qos=2)
+        def mqtt_callback_on_subscribe(self, client, userdata, mid, granted_qos):
+            # TODO should / could track how many / which topics have been granted
+            if any(q != 2 for q in granted_qos):
+                LOGGER.warning('MQTT subscription did not obtain QoS level 2')
+            self._live = True
+            self._live_event.set()
+        def mqtt_callback_on_disconnect(self, client, userdata, rc):
+            LOGGER.warning('MQTT disconnect for '+str(self._scope)+' with result code '+str(rc))
+        def mqtt_callback_on_message(self, client, userdata, message):
+            req = ipaaca.converter.deserialize(message.payload)
+            result = None
+            if isinstance(req, ipaaca.converter.IUPayloadUpdate):
+                result = self.attempt_to_apply_remote_updatePayload(req)
+            elif isinstance(req, ipaaca.converter.IULinkUpdate):
+                result = self.attempt_to_apply_remote_updateLinks(req)
+            elif isinstance(req, ipaaca.ipaaca_pb2.IUCommission):
+                result = self.attempt_to_apply_remote_commit(req)
+            elif isinstance(req, ipaaca.ipaaca_pb2.IUResendRequest):
+                result = self.attempt_to_apply_remote_resendRequest(req)
+            else:
+                raise RuntimeError('LocalServer: got an object of wrong class '+str(req.__class__.__name__))  # TODO replace
+            if result is not None:
+                self.send_result_for_request(req, result)
+        #
+        def send_result_for_request(self, obj, result):
+            pbo = ipaaca.ipaaca_pb2.RemoteRequestResult()
+            pbo.result = result
+            pbo.request_uid = obj.request_uid
+            #print('Sending result to endpoint '+str(obj.request_endpoint))
+            self._mqtt_client.publish(obj.request_endpoint, ipaaca.converter.serialize(pbo), qos=2)
+        def attempt_to_apply_remote_updateLinks(self, obj):
+            return self._buffer._remote_update_links(obj)
+        def attempt_to_apply_remote_updatePayload(self, obj):
+            return self._buffer._remote_update_payload(obj)
+        def attempt_to_apply_remote_commit(self, obj):
+            return self._buffer._remote_commit(obj)
+        def attempt_to_apply_remote_resendRequest(self, obj):
+            return self._buffer._remote_request_resend(obj)
+
+
+    class RemoteServer(object):
+        '''RemoteServer, connects to a LocalServer on the side
+        of an actual IU owner, which will process any requests.
+        The RemoteServer is put on hold while the owner is
+        processing. RemoteServer is from RSB terminology,
+        it might more aptly be described as an RPC client.'''
+        def __init__(self, remote_end_scope, config=None):
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._pending_requests_lock = threading.Lock()
+            self._pending_requests = {}
+            #queue.Queue(_REMOTE_SERVER_MAX_QUEUED_REQUESTS)
+            self._uuid = str(uuid.uuid4())[0:8]
+            self._name = 'PID_' + str(os.getpid()) + '_RemoteServer_' + self._uuid
+            # will RECV here:
+            self._scope = '/ipaaca/remotes/' + self._name
+            # will SEND here
+            self._remote_end_scope = remote_end_scope
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + remote_end_scope
+            self._mqtt_client = mqtt.Client(self._client_id)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = int(config.get_with_default('transport.mqtt.port', 1883, warn=True))
+            self._mqtt_client.on_connect = self.mqtt_callback_on_connect
+            self._mqtt_client.on_disconnect = self.mqtt_callback_on_disconnect
+            self._mqtt_client.on_message = self.mqtt_callback_on_message
+            self._mqtt_client.on_subscribe = self.mqtt_callback_on_subscribe
+            #self._mqtt_client.on_publish = self.mqtt_callback_on_publish
+            self.run_in_background()
+        def deactivate(self):
+            pass
+        def deactivate_internal(self):
+            self._mqtt_client.disconnect()
+            self._mqtt_client = None
+        def run_in_background(self):
+            if not self._running:
+                self._running = True
+                self._mqtt_client.loop_start()
+                self._mqtt_client.connect(self._host, self._port)
+        def mqtt_callback_on_connect(self, client, userdata, flags, rc):
+            if rc > 0:
+                LOGGER.warning('MQTT connect failed, result code ' + str(rc))
+            else:
+                self._mqtt_client.subscribe(self._scope, qos=2)
+        def mqtt_callback_on_subscribe(self, client, userdata, mid, granted_qos):
+            # TODO should / could track how many / which topics have been granted
+            if any(q != 2 for q in granted_qos):
+                LOGGER.warning('MQTT subscription did not obtain QoS level 2')
+            self._live = True
+            self._live_event.set()
+        def mqtt_callback_on_disconnect(self, client, userdata, rc):
+            LOGGER.warning('MQTT disconnect for '+str(self._scope)+' with result code '+str(rc))
+        def mqtt_callback_on_message(self, client, userdata, message):
+            reply = ipaaca.converter.deserialize(message.payload)
+            if isinstance(reply, ipaaca.ipaaca_pb2.RemoteRequestResult):
+                uid = reply.request_uid
+                pending_request = None
+                with self._pending_requests_lock:
+                    if uid in self._pending_requests:
+                        pending_request = self._pending_requests[uid]
+                        del self._pending_requests[uid]
+                if pending_request is None:
+                    raise RuntimeError('RemoteServer: got a reply for request uid that is not queued: '+str(uid))
+                else:
+                    # provide result to other thread and unblock it
+                    pending_request.reply_with_result(reply)
+            else:
+                raise RuntimeError('RemoteServer: got an object of wrong class '+str(reply.__class__.__name__))  # TODO replace
+        def queue_pending_request(self, request):
+            pending_request = PendingRequest(request)
+            with self._pending_requests_lock:
+                if _REMOTE_SERVER_MAX_QUEUED_REQUESTS>0 and len(self._pending_requests) >= _REMOTE_SERVER_MAX_QUEUED_REQUESTS:
+                    raise RuntimeError('RemoteServer: maximum number of pending requests exceeded')   # TODO replace?
+                else:
+                    self._pending_requests[pending_request._request_uid] = pending_request
+                    return pending_request
+        # impl
+        def blocking_call(self, request):
+            # Broker's queue will raise before sending anything if capacity is exceeded
+            pending_request = self.queue_pending_request(request)
+            # complete and send request
+            request.request_uid = pending_request._request_uid
+            request.request_endpoint = self._scope
+            self._mqtt_client.publish(self._remote_end_scope, ipaaca.converter.serialize(request), qos=2)
+            # wait for other end to return result
+            reply = pending_request.wait_for_reply()
+            if reply is None:
+                LOGGER.warning('A request timed out!')
+                return 0
+            else:
+                return reply.result  # the actual int result
+        # glue that quacks like the RSB version
+        def resendRequest(self, req):
+            return self.blocking_call(req)
+        def commit(self, req):
+            return self.blocking_call(req)
+        def updatePayload(self, req):
+            return self.blocking_call(req)
+        def updateLinks(self, req):
+            return self.blocking_call(req)
+
+    class MQTTBackend(object):
+        
+        def __init__(self, name='mqtt'):
+            # back-end initialization code
+            self._config = ipaaca.config.get_global_config()
+            self._name = name
+            self._participants = set()
+
+        def _get_name(self):
+            return self._name
+        name = property(_get_name)
+
+        def teardown(self):
+            LOGGER.info('MQTT teardown: waiting 1 sec for final deliveries')
+            time.sleep(1)
+            for p in self._participants:
+                p.deactivate_internal()
+
+        def Scope(self, scope_str):
+            '''Scope adapter (glue replacing rsb.Scope)'''
+            return str(scope_str)
+
+        def createLocalServer(self, buffer_impl, scope, config=None):
+            LOGGER.debug('Creating a LocalServer on '+str(scope))
+            s = LocalServer(buffer_impl, scope, self._config if config is None else config)
+            self._participants.add(s)
+            s._live_event.wait(30.0)
+            return s
+         
+        def createRemoteServer(self, scope, config=None):
+            LOGGER.debug('Creating a RemoteServer on '+str(scope))
+            s = RemoteServer(scope, self._config if config is None else config)
+            self._participants.add(s)
+            s._live_event.wait(30.0)
+            return s
+
+        def createInformer(self, scope, config=None, dataType="ignored in this backend"):
+            LOGGER.debug('Creating an Informer on '+str(scope))
+            s = Informer(scope, self._config if config is None else config)
+            self._participants.add(s)
+            s._live_event.wait(30.0)
+            return s
+
+        def createListener(self, scope, config=None):
+            LOGGER.debug('Creating a Listener on '+str(scope))
+            s = Listener(scope, self._config if config is None else config)
+            self._participants.add(s)
+            s._live_event.wait(30.0)
+            return s
+            
+
+

ipaacalib/python/src/ipaaca/backend_ros.py

+# -*- coding: utf-8 -*-
+
+# This file is part of IPAACA, the
+#  "Incremental Processing Architecture
+#   for Artificial Conversational Agents".
+#
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
+#                         CITEC, Bielefeld University
+#
+# http://opensource.cit-ec.de/projects/ipaaca/
+# http://purl.org/net/ipaaca
+#
+# This file may be licensed under the terms of of the
+# GNU Lesser General Public License Version 3 (the ``LGPL''),
+# or (at your option) any later version.
+#
+# Software distributed under the License is distributed
+# on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+# express or implied. See the LGPL for the specific language
+# governing rights and limitations.
+#
+# You should have received a copy of the LGPL along with this
+# program. If not, go to http://www.gnu.org/licenses/lgpl.html
+# or write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# The development of this software was supported by the
+# Excellence Cluster EXC 277 Cognitive Interaction Technology.
+# The Excellence Cluster EXC 277 is a grant of the Deutsche
+# Forschungsgemeinschaft (DFG) in the context of the German
+# Excellence Initiative.
+
+from __future__ import division, print_function
+
+import collections
+import sys
+
+import ipaaca.ipaaca_pb2
+import ipaaca.defaults
+import ipaaca.exception
+import ipaaca.iu
+import ipaaca.misc
+import ipaaca.converter
+import ipaaca.backend
+
+import ipaaca.config as config
+
+LOGGER = ipaaca.misc.get_library_logger()
+
+
+
+ROS_ENABLED, __try_guessing = False, False
+try:
+    import rospy
+    from std_msgs.msg import String
+    import base64
+    ROS_ENABLED = True
+except:
+    LOGGER.debug('rospy or deps not found, ROS backend disabled')
+    ROS_ENABLED = False
+
+if not ROS_ENABLED:
+    def create_backend():
+        return None
+else:
+    def create_backend():
+        return ROSBackend(name='ros')
+
+    import threading
+    try:
+        import queue
+    except:
+        import Queue as queue
+    import uuid
+    import os
+    import time
+    import sys
+
+    class EventWrapper(object):
+        def __init__(self, data):
+            self.data = data
+
+    class PendingRequest(object):
+        '''Encapsulation of a pending remote request with
+        a facility to keep the requesting thread locked
+        until the reply or a timeout unlocks it.'''
+        def __init__(self, request):
+            self._request = request
+            self._event = threading.Event()
+            self._reply = None
+            self._request_uid = str(uuid.uuid4())[0:8]
+        def wait_for_reply(self, timeout=30.0):
+            wr = self._event.wait(timeout)
+            return None if wr is False else self._reply
+        def reply_with_result(self, reply):
+            self._reply = reply
+            self._event.set()
+            
+    class Informer(object):
+        '''Informer interface, wrapping an outbound port to ROS'''
+        def __init__(self, scope, config=None):
+            self._scope = scope
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._handlers = []
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + scope
+            self._ros_pub = rospy.Publisher(self._scope, String, queue_size=100, tcp_nodelay=True, latch=True)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = config.get_with_default('transport.mqtt.port', 1883, warn=True)
+        def deactivate(self):
+            pass
+            #self._ros_pub.unregister()
+            #self._ros_pub = None
+        def publishData(self, data):
+            self._ros_pub.publish(ROSBackend.serialize(data))
+
+    class BackgroundEventDispatcher(threading.Thread):
+        def __init__(self, event, handlers):
+            super(BackgroundEventDispatcher, self).__init__()
+            self.daemon = True
+            self._event = event
+            self._handlers = handlers
+        def run(self):
+            for handler in self._handlers:
+                handler(self._event)
+
+    class Listener(object):
+        '''Listener interface, wrapping an inbound port from ROS'''
+        def __init__(self, scope, config=None):
+            self._scope = scope
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._handlers = []
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + scope
+            self._ros_sub = rospy.Subscriber(self._scope, String, self.on_message, tcp_nodelay=True)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = config.get_with_default('transport.mqtt.port', 1883, warn=True)
+        def deactivate(self):
+            pass
+            #self._ros_sub.unregister()
+            #self._ros_sub = None
+        def on_message(self, message):
+            event = EventWrapper(ROSBackend.deserialize(message.data))
+            ## (1) with extra thread:
+            #dispatcher = BackgroundEventDispatcher(event, self._handlers)
+            #dispatcher.start()
+            ## or (2) with no extra thread:
+            for handler in self._handlers:
+                handler(event)
+        def addHandler(self, handler):
+            self._handlers.append(handler)
+
+    class LocalServer(object):
+        '''LocalServer interface, allowing for RPC requests to
+        IU functions, or reporting back success or failure.'''
+        def __init__(self, buffer_impl, scope, config=None):
+            self._buffer = buffer_impl
+            self._scope = scope
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._pending_requests_lock = threading.Lock()
+            self._pending_requests = {}
+            self._uuid = str(uuid.uuid4())[0:8]
+            self._name = 'PID_' + str(os.getpid()) + '_LocalServer_' + self._uuid # unused atm
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + scope
+            self._ros_pubs = {}
+            self._ros_sub = rospy.Subscriber(self._scope, String, self.on_message, tcp_nodelay=True)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = config.get_with_default('transport.mqtt.port', 1883, warn=True)
+        def get_publisher(self, endpoint):
+            if endpoint in self._ros_pubs:
+                return self._ros_pubs[endpoint]
+            else:
+                p = rospy.Publisher(endpoint, String, queue_size=10, tcp_nodelay=True, latch=True)
+                self._ros_pubs[endpoint] = p
+                return p
+        def deactivate(self):
+            pass
+            #self._ros_sub.unregister()
+            #for v in self._ros_pubs.values():
+            #    v.unregister()
+            #self._ros_sub = None
+            #self._ros_pubs = {}
+        def on_message(self, message):
+            req = ROSBackend.deserialize(message.data)
+            result = None
+            if isinstance(req, ipaaca.converter.IUPayloadUpdate):
+                result = self.attempt_to_apply_remote_updatePayload(req)
+            elif isinstance(req, ipaaca.converter.IULinkUpdate):
+                result = self.attempt_to_apply_remote_updateLinks(req)
+            elif isinstance(req, ipaaca.ipaaca_pb2.IUCommission):
+                result = self.attempt_to_apply_remote_commit(req)
+            elif isinstance(req, ipaaca.ipaaca_pb2.IUResendRequest):
+                result = self.attempt_to_apply_remote_resendRequest(req)
+            else:
+                raise RuntimeError('LocalServer: got an object of wrong class '+str(req.__class__.__name__))  # TODO replace
+            if result is not None:
+                self.send_result_for_request(req, result)
+        #
+        def send_result_for_request(self, obj, result):
+            pbo = ipaaca.ipaaca_pb2.RemoteRequestResult()
+            pbo.result = result
+            pbo.request_uid = obj.request_uid
+            #print('Sending result to endpoint '+str(obj.request_endpoint))
+            pub = self.get_publisher(obj.request_endpoint)
+            pub.publish(ROSBackend.serialize(pbo))
+        def attempt_to_apply_remote_updateLinks(self, obj):
+            return self._buffer._remote_update_links(obj)
+        def attempt_to_apply_remote_updatePayload(self, obj):
+            return self._buffer._remote_update_payload(obj)
+        def attempt_to_apply_remote_commit(self, obj):
+            return self._buffer._remote_commit(obj)
+        def attempt_to_apply_remote_resendRequest(self, obj):
+            return self._buffer._remote_request_resend(obj)
+
+
+    _REMOTE_SERVER_MAX_QUEUED_REQUESTS = -1 # unlimited
+
+    class RemoteServer(object):
+        '''RemoteServer, connects to a LocalServer on the side
+        of an actual IU owner, which will process any requests.
+        The RemoteServer is put on hold while the owner is
+        processing. RemoteServer is from RSB terminology,
+        it might more aptly be described as an RPC client.'''
+        def __init__(self, remote_end_scope, config=None):
+            self._running = False
+            self._live = False
+            self._live_event = threading.Event()
+            self._pending_requests_lock = threading.Lock()
+            self._pending_requests = {}
+            #queue.Queue(_REMOTE_SERVER_MAX_QUEUED_REQUESTS)
+            self._uuid = str(uuid.uuid4())[0:8]
+            self._name = 'PID_' + str(os.getpid()) + '_RemoteServer_' + self._uuid
+            # will RECV here:
+            self._scope = '/ipaaca/remotes/' + self._name
+            # will SEND here
+            self._remote_end_scope = remote_end_scope
+            #
+            self._client_id = '%s.%s_%s'%(self.__module__, self.__class__.__name__, str(uuid.uuid4())[0:8])
+            self._client_id += '_' + remote_end_scope
+            self._ros_pub = rospy.Publisher(self._remote_end_scope, String, queue_size=10, tcp_nodelay=True, latch=True)
+            self._ros_sub = rospy.Subscriber(self._scope, String, self.on_message, tcp_nodelay=True)
+            self._host = config.get_with_default('transport.mqtt.host', 'localhost', warn=True)
+            self._port = config.get_with_default('transport.mqtt.port', 1883, warn=True)
+        def deactivate(self):
+            pass
+            #self._ros_sub.unregister()
+            #self._ros_pub.unregister()
+            #self._ros_sub = None
+            #self._ros_pub = None
+        def on_message(self, message):
+            reply = ROSBackend.deserialize(message.data)
+            if isinstance(reply, ipaaca.ipaaca_pb2.RemoteRequestResult):
+                uid = reply.request_uid
+                pending_request = None
+                with self._pending_requests_lock:
+                    if uid in self._pending_requests:
+                        pending_request = self._pending_requests[uid]
+                        del self._pending_requests[uid]
+                if pending_request is None:
+                    raise RuntimeError('RemoteServer: got a reply for request uid that is not queued: '+str(uid))
+                else:
+                    # provide result to other thread and unblock it
+                    pending_request.reply_with_result(reply)
+            else:
+                raise RuntimeError('RemoteServer: got an object of wrong class '+str(reply.__class__.__name__))  # TODO replace
+        def queue_pending_request(self, request):
+            pending_request = PendingRequest(request)
+            with self._pending_requests_lock:
+                if _REMOTE_SERVER_MAX_QUEUED_REQUESTS>0 and len(self._pending_requests) >= _REMOTE_SERVER_MAX_QUEUED_REQUESTS:
+                    raise RuntimeError('RemoteServer: maximum number of pending requests exceeded')   # TODO replace?
+                else:
+                    self._pending_requests[pending_request._request_uid] = pending_request
+                    return pending_request
+        # impl
+        def blocking_call(self, request):
+            # Broker's queue will raise before sending anything if capacity is exceeded
+            pending_request = self.queue_pending_request(request)
+            # complete and send request
+            request.request_uid = pending_request._request_uid
+            request.request_endpoint = self._scope
+            self._ros_pub.publish(ROSBackend.serialize(request))
+            # wait for other end to return result
+            reply = pending_request.wait_for_reply()
+            if reply is None:
+                LOGGER.warning('A request timed out!')
+                return 0
+            else:
+                return reply.result  # the actual int result
+        # glue that quacks like the RSB version
+        def resendRequest(self, req):
+            return self.blocking_call(req)
+        def commit(self, req):
+            return self.blocking_call(req)
+        def updatePayload(self, req):
+            return self.blocking_call(req)
+        def updateLinks(self, req):
+            return self.blocking_call(req)
+
+    class ROSBackend(object):
+        
+        def __init__(self, name='ros'):
+            #import logging
+            # back-end initialization code
+            self._name = name
+            self._need_init = True
+            #logging.basicConfig(level=logging.DEBUG)
+        
+        def init_once(self):
+            '''Actual back-end initialization is only done when it is used'''
+            if self._need_init:
+                self._need_init = False
+                self._config = config.get_global_config()
+                try:
+                    # generate a ROS node prefix from the basename of argv[0]
+                    clean_name = ''.join([c for c in sys.argv[0].rsplit('/',1)[-1].replace('.', '_').replace('-','_') if c.lower() in 'abcdefghijklmnoprqstuvwxzy0123456789_'])
+                except:
+                    clean_name = ''
+                rospy.init_node('ipaaca_python' if len(clean_name)==0 else clean_name,
+                        anonymous=True, disable_signals=True)
+
+        def _get_name(self):
+            return self._name
+        name = property(_get_name)
+
+        def teardown(self):
+            LOGGER.info('ROS teardown: waiting 1 sec for final deliveries')
+            time.sleep(1)
+            rospy.signal_shutdown('Done')
+
+        @staticmethod
+        def serialize(obj):
+            #print('object class: '+obj.__class__.__name__)
+            bb = ipaaca.converter.serialize(obj)
+            st = str(base64.b64encode(bb))
+            #print('serialized: '+str(st))
+            return st
+        
+        @staticmethod
+        def deserialize(msg):
+            #print('got serialized: '+str(msg))
+            bb = base64.b64decode(msg)
+            return ipaaca.converter.deserialize(bb)
+        
+        def Scope(self, scope_str):
+            '''Scope adapter (glue replacing rsb.Scope)'''
+            # ROS graph resources must not start with a slash
+            return str(scope_str)[1:] if scope_str.startswith('/') else str(scope_str)
+
+        def createLocalServer(self, buffer_impl, scope, config=None):
+            self.init_once()
+            LOGGER.debug('Creating a LocalServer on '+str(scope))
+            LOGGER.debug('              from thread '+threading.current_thread().name)
+            s = LocalServer(buffer_impl, scope, self._config if config is None else config)
+            #s._live_event.wait(30.0)
+            return s
+         
+        def createRemoteServer(self, scope, config=None):
+            self.init_once()
+            LOGGER.debug('Creating a RemoteServer on '+str(scope))
+            LOGGER.debug('               from thread '+threading.current_thread().name)
+            s = RemoteServer(scope, self._config if config is None else config)
+            #s._live_event.wait(30.0)
+            return s
+
+        def createInformer(self, scope, config=None, dataType="ignored in this backend"):
+            self.init_once()
+            LOGGER.debug('Creating an Informer on '+str(scope))
+            LOGGER.debug('            from thread '+threading.current_thread().name)
+            s = Informer(scope, self._config if config is None else config)
+            #s._live_event.wait(30.0)
+            return s
+
+        def createListener(self, scope, config=None):
+            self.init_once()
+            LOGGER.debug('Creating a Listener on '+str(scope))
+            LOGGER.debug('           from thread '+threading.current_thread().name)
+            s = Listener(scope, self._config if config is None else config)
+            #s._live_event.wait(30.0)
+            return s
+            
+
+

ipaacalib/python/src/ipaaca/buffer.py

@@ -4,7 +4,7 @@
 #  "Incremental Processing Architecture
 #   for Artificial Conversational Agents".
 #
-# Copyright (c) 2009-2014 Social Cognitive Systems Group
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
 #                         CITEC, Bielefeld University
 #
 # http://opensource.cit-ec.de/projects/ipaaca/
@@ -35,24 +35,49 @@ from __future__ import division, print_function
 
 import threading
 import uuid
+import traceback
 
-import rsb
+import six
+import weakref
+import atexit
 
-import ipaaca_pb2
+#import rsb
+
+import ipaaca.ipaaca_pb2
 import ipaaca.defaults
 import ipaaca.exception
 import ipaaca.converter
 import ipaaca.iu
-
-
+import ipaaca.backend
 
 __all__ = [
 	'InputBuffer',
 	'OutputBuffer',
 ]
-
 LOGGER = ipaaca.misc.get_library_logger()
 
+# set of objects to auto-clean on exit, assumes _teardown() method
+TEARDOWN_OBJECTS = set()
+
+def atexit_cleanup_function():
+	'''Function to call at program exit to auto-clean objects.'''
+	global TEARDOWN_OBJECTS
+	for obj_r in TEARDOWN_OBJECTS:
+		obj = obj_r()
+		if obj is not None: # if weakref still valid
+			obj._teardown()
+	ipaaca.backend.get_default_backend().teardown()
+atexit.register(atexit_cleanup_function)
+
+def auto_teardown_instances(fn):
+	'''Decorator function for object constructors, to add
+	new instances to the object set to auto-clean at exit.'''
+	def auto_teardown_instances_wrapper(instance, *args, **kwargs):
+		global TEARDOWN_OBJECTS
+		fn(instance, *args, **kwargs)
+		TEARDOWN_OBJECTS.add(weakref.ref(instance))
+	return auto_teardown_instances_wrapper
+
 class IUStore(dict):
 	"""A dictionary storing IUs."""
 	def __init__(self):
@@ -89,10 +114,10 @@ class IUEventHandler(object):
 		self._handler_function = handler_function
 		self._for_event_types = (
 			None if for_event_types is None else
-			(for_event_types[:] if hasattr(for_event_types, '__iter__') else [for_event_types]))
+			(for_event_types[:] if not isinstance(for_event_types, six.string_types) and hasattr(for_event_types, '__iter__') else [for_event_types]))
 		self._for_categories = (
 			None if for_categories is None else
-			(for_categories[:] if hasattr(for_categories, '__iter__') else [for_categories]))
+			(for_categories[:] if not isinstance(for_categories, six.string_types) and hasattr(for_categories, '__iter__') else [for_categories]))
 
 	def condition_met(self, event_type, category):
 		"""Check whether this IUEventHandler should be called.
@@ -132,9 +157,10 @@ class Buffer(object):
 		participant_config -- RSB configuration
 		'''
 		super(Buffer, self).__init__()
+		ipaaca.initialize_ipaaca_rsb_if_needed()
 		self._owning_component_name = owning_component_name
 		self._channel = channel if channel is not None else ipaaca.defaults.IPAACA_DEFAULT_CHANNEL
-		self._participant_config = rsb.ParticipantConfig.fromDefaultSources() if participant_config is None else participant_config
+		self._participant_config = participant_config
 		self._uuid = str(uuid.uuid4())[0:8]
 		# Initialise with a temporary, but already unique, name
 		self._unique_name = "undef-"+self._uuid
@@ -145,6 +171,12 @@ class Buffer(object):
 		return FrozenIUStore(original_iu_store = self._iu_store)
 	iu_store = property(fget=_get_frozen_iu_store, doc='Copy-on-read version of the internal IU store')
 
+	def _get_channel(self):
+		return self._channel
+	channel = property(
+			fget=_get_channel,
+			doc='The IPAACA channel the buffer is connected to.')
+
 	def register_handler(self, handler_function, for_event_types=None, for_categories=None):
 		"""Register a new IU event handler function.
 
@@ -168,8 +200,9 @@ class Buffer(object):
 				h.call(self, uid, local=local, event_type=event_type, category=category)
 			except Exception as e:
 				if local:
-					LOGGER.error('Local IU handler raised an exception upon remote write.' + unicode(e))
+					LOGGER.error('Local IU handler raised an exception upon remote write.' + str(e))
 				else:
+					print(str(traceback.format_exc()))
 					raise e
 	
 	def _get_owning_component_name(self):
@@ -187,6 +220,7 @@ class InputBuffer(Buffer):
 
 	"""An InputBuffer that holds remote IUs."""
 
+	@auto_teardown_instances
 	def __init__(self, owning_component_name, category_interests=None, channel=None, participant_config=None, resend_active=False):
 		'''Create an InputBuffer.
 
@@ -205,26 +239,40 @@ class InputBuffer(Buffer):
 		self._add_category_listener(str(self._uuid))
 		if category_interests is not None:
 			self.add_category_interests(category_interests)
-
-	def _get_remote_server(self, iu):
+	
+	def _get_remote_server(self, event_or_iu):
 		'''Return (or create, store and return) a remote server.'''
-		_owner = None
-		if hasattr(iu,'owner_name'):
-			_owner = iu.owner_name
-		elif hasattr(iu,'writer_name'):
-			_owner = iu.writer_name
-		if _owner is not None:
-			if _owner in self._remote_server_store:
-				return self._remote_server_store[_owner]
-			#  TODO remove the str() when unicode is supported (issue #490)
-			remote_server = rsb.createRemoteServer(rsb.Scope(str(_owner)))
-			self._remote_server_store[_owner] = remote_server
-		return remote_server
+		_remote_server_name = self._get_owner(event_or_iu) + '/Server'
+		if _remote_server_name:
+			try:
+				return self._remote_server_store[_remote_server_name]
+			except KeyError:
+				be = ipaaca.backend.get_default_backend()
+				remote_server = be.createRemoteServer(be.Scope(str(_remote_server_name)), config=self._participant_config)
+				self._remote_server_store[_remote_server_name] = remote_server
+				return remote_server
+		else:
+			None
+
+	def _get_owner(self, event_or_iu):
+		if hasattr(event_or_iu, 'data'):
+			# is RSB event
+			data = event_or_iu.data
+			if hasattr(data, 'owner_name'):
+				return data.owner_name
+			elif hasattr(data, 'writer_name'):
+				return data.writer_name
+			else:
+				return None
+		else:
+			# is IU
+			return event_or_iu.owner_name
 
 	def _add_category_listener(self, iu_category):
 		'''Create and store a listener on a specific category.'''
 		if iu_category not in self._listener_store:
-			cat_listener = rsb.createListener(rsb.Scope("/ipaaca/channel/"+str(self._channel)+"/category/"+str(iu_category)), config=self._participant_config)
+			be = ipaaca.backend.get_default_backend()
+			cat_listener = be.createListener(be.Scope("/ipaaca/channel/"+str(self._channel)+"/category/"+str(iu_category)), config=self._participant_config)
 			cat_listener.addHandler(self._handle_iu_events)
 			self._listener_store[iu_category] = cat_listener
 			self._category_interests.append(iu_category)
@@ -237,6 +285,24 @@ class InputBuffer(Buffer):
 			self._category_interests.remove(iu_category)
 			LOGGER.info("Removed listener in scope /ipaaca/channel/" + str(self._channel) + "/category/ " + iu_category)
 
+	def _teardown(self):
+		'''OutputBuffer retracts remaining live IUs on teardown'''
+		self._deactivate_all_internal()
+
+	def __del__(self):
+		'''Perform teardown as soon as Buffer is lost.'''
+		self._deactivate_all_internal()
+
+	def _deactivate_all_internal(self):
+		'''Deactivate all participants.'''
+		for listener in self._listener_store.values():
+			try:
+				listener.deactivate()
+			except RuntimeError:
+				# Is raised if an already deactivated participant is 
+				# deactivated again
+				pass
+
 	def _handle_iu_events(self, event):
 		'''Dispatch incoming IU events.
 
@@ -247,7 +313,7 @@ class InputBuffer(Buffer):
 		event -- a converted RSB event
 		'''
 		type_ = type(event.data)
-		if type_ is ipaaca.iu.RemotePushIU:
+		if type_ == ipaaca.iu.RemotePushIU:
 			# a new IU
 			if event.data.uid not in self._iu_store:
 				self._iu_store[event.data.uid] = event.data
@@ -260,7 +326,7 @@ class InputBuffer(Buffer):
 				# done via the resend request mechanism).
 				self._iu_store[event.data.uid] = event.data
 				event.data.buffer = self
-		elif type_ is ipaaca.iu.RemoteMessage:
+		elif type_ == ipaaca.iu.RemoteMessage:
 			# a new Message, an ephemeral IU that is removed after calling handlers
 			self._iu_store[ event.data.uid ] = event.data
 			event.data.buffer = self
@@ -268,40 +334,41 @@ class InputBuffer(Buffer):
 			del self._iu_store[ event.data.uid ]
 		else:
 			if event.data.uid not in self._iu_store:
-				if self._resend_active:
-					# send resend request to remote server
-					self._request_remote_resend(event.data)
+				if (self._resend_active and 
+							not type_ == ipaaca.ipaaca_pb2.IURetraction):
+					# send resend request to remote server, IURetraction is ignored
+					try:
+						self._request_remote_resend(event)
+					except ipaaca.exception.IUResendRequestFailedError:
+						LOGGER.warning('Requesting resend for IU {} failed.'.
+								format(event.data.uid))
 				else:
 					LOGGER.warning("Received an update for an IU which we did not receive before.")
 				return
 			# an update to an existing IU
-			if type_ is ipaaca_pb2.IURetraction:
+			if type_ == ipaaca.ipaaca_pb2.IURetraction:
 				# IU retraction (cannot be triggered remotely)
 				iu = self._iu_store[event.data.uid]
 				iu._revision = event.data.revision
 				iu._apply_retraction() # for now - just sets the _rectracted flag.
 				self.call_iu_event_handlers(event.data.uid, local=False, event_type=ipaaca.iu.IUEventType.RETRACTED, category=iu.category)
-				# SPECIAL CASE: allow the handlers (which will need to find the IU
-				#  in the buffer) to operate on the IU - then delete it afterwards!
-				# FIXME: for now: retracted == deleted! Think about this later
-				del(self._iu_store[iu.uid])
 			else:
 				if event.data.writer_name == self.unique_name:
 					# Notify only for remotely triggered events;
 					# Discard updates that originate from this buffer
 					return
-				if type_ is ipaaca_pb2.IUCommission:
+				if type_ == ipaaca.ipaaca_pb2.IUCommission:
 					# IU commit
 					iu = self._iu_store[event.data.uid]
 					iu._apply_commission()
 					iu._revision = event.data.revision
 					self.call_iu_event_handlers(event.data.uid, local=False, event_type=ipaaca.iu.IUEventType.COMMITTED, category=iu.category)
-				elif type_ is ipaaca.converter.IUPayloadUpdate:
+				elif type_ == ipaaca.converter.IUPayloadUpdate:
 					# IU payload update
 					iu = self._iu_store[event.data.uid]
 					iu._apply_update(event.data)
 					self.call_iu_event_handlers(event.data.uid, local=False, event_type=ipaaca.iu.IUEventType.UPDATED, category=iu.category)
-				elif type_ is ipaaca.converter.IULinkUpdate:
+				elif type_ == ipaaca.converter.IULinkUpdate:
 					# IU link update
 					iu = self._iu_store[event.data.uid]
 					iu._apply_link_update(event.data)
@@ -310,27 +377,31 @@ class InputBuffer(Buffer):
 					LOGGER.warning('Warning: _handle_iu_events failed to handle an object of type '+str(type_))
 
 	def add_category_interests(self, category_interests):
-		if hasattr(category_interests, '__iter__'):
+		if not isinstance(category_interests, six.string_types) and hasattr(category_interests, '__iter__'):
 			for interest in category_interests:
 				self._add_category_listener(interest)
 		else:
 			self._add_category_listener(category_interests)
 
 	def remove_category_interests(self, category_interests):
-		if hasattr(category_interests, '__iter__'):
+		if not isinstance(category_interests, six.string_types) and hasattr(category_interests, '__iter__'):
 			for interest in category_interests:
 				self._remove_category_listener(interest)
 		else:
 			self._remove_category_listener(category_interests)
 
-	def _request_remote_resend(self, iu):
-		remote_server = self._get_remote_server(iu)
-		resend_request = ipaaca_pb2.IUResendRequest()
-		resend_request.uid = iu.uid # target iu
-		resend_request.hidden_scope_name = str(self._uuid) # hidden category name
-		remote_revision = remote_server.requestResend(resend_request)
-		if remote_revision == 0:
-			raise ipaaca.exception.IUResendRequestFailedError()
+	def _request_remote_resend(self, event):
+		remote_server = self._get_remote_server(event)
+		if remote_server:
+			resend_request = ipaaca.ipaaca_pb2.IUResendRequest()
+			resend_request.uid = event.data.uid # target iu
+			resend_request.hidden_scope_name = str(self._uuid) # hidden category name
+			remote_revision = remote_server.resendRequest(resend_request)
+			if remote_revision == 0:
+				raise ipaaca.exception.IUResendRequestFailedError(event.data.uid)
+		else:
+			# Remote server is not known
+			raise ipaaca.exception.IUResendRequestRemoteServerUnknownError(event.data.uid)
 
 	def register_handler(self, handler_function, for_event_types=None, for_categories=None):
 		"""Register a new IU event handler function.
@@ -362,8 +433,9 @@ class OutputBuffer(Buffer):
 
 	"""An OutputBuffer that holds local IUs."""
 
+	@auto_teardown_instances
 	def __init__(self, owning_component_name, channel=None, participant_config=None):
-		'''Create an Output Buffer.
+		'''Create an OutputBuffer.
 
 		Keyword arguments:
 		owning_component_name -- name of the entity that own this buffer
@@ -371,15 +443,25 @@ class OutputBuffer(Buffer):
 		'''
 		super(OutputBuffer, self).__init__(owning_component_name, channel, participant_config)
 		self._unique_name = '/ipaaca/component/' + str(owning_component_name) + 'ID' + self._uuid + '/OB'
-		self._server = rsb.createLocalServer(rsb.Scope(self._unique_name))
-		self._server.addMethod('updateLinks', self._remote_update_links, ipaaca.converter.IULinkUpdate, int)
-		self._server.addMethod('updatePayload', self._remote_update_payload, ipaaca.converter.IUPayloadUpdate, int)
-		self._server.addMethod('commit', self._remote_commit, ipaaca_pb2.IUCommission, int)
-		self._server.addMethod('requestResend', self._remote_request_resend, ipaaca_pb2.IUResendRequest, int)
+		be = ipaaca.backend.get_default_backend()
+		self._server = be.createLocalServer(self, be.Scope(self._unique_name + '/Server'), config=self._participant_config)
 		self._informer_store = {}
 		self._id_prefix = str(owning_component_name)+'-'+str(self._uuid)+'-IU-'
 		self.__iu_id_counter_lock = threading.Lock()
 
+	def _teardown(self):
+		'''OutputBuffer retracts remaining live IUs on teardown'''
+		self._retract_all_internal()
+		self._deactivate_all_internal()
+
+	def __del__(self):
+		'''Perform teardown (IU retractions) as soon as Buffer is lost.
+		Note that at program exit the teardown might be called
+		twice for live objects (atexit, then del), but the
+		_retract_all_internal method prevents double retractions.'''
+		self._retract_all_internal()
+		self._deactivate_all_internal()
+
 	def _remote_update_links(self, update):
 		'''Apply a remotely requested update to one of the stored IU's links.'''
 		if update.uid not in self._iu_store:
@@ -407,10 +489,10 @@ class OutputBuffer(Buffer):
 		with iu.revision_lock:
 			if (update.revision != 0) and (update.revision != iu.revision):
 				# (0 means "do not pay attention to the revision number" -> "force update")
-				LOGGER.warning(u"Remote update_payload operation failed because request was out of date; IU "+str(update.uid))
-				LOGGER.warning(u"  Writer was: "+update.writer_name)
-				LOGGER.warning(u"  Requested update was: (New keys:) "+','.join(update.new_items.keys())+'  (Removed keys:) '+','.join(update.keys_to_remove))
-				LOGGER.warning(u"  Referred-to revision was "+str(update.revision)+' while local revision is '+str(iu.revision))
+				LOGGER.warning("Remote update_payload operation failed because request was out of date; IU "+str(update.uid))
+				LOGGER.warning("  Writer was: "+update.writer_name)
+				LOGGER.warning("  Requested update was: (New keys:) "+','.join(update.new_items.keys())+'  (Removed keys:) '+','.join(update.keys_to_remove))
+				LOGGER.warning("  Referred-to revision was "+str(update.revision)+' while local revision is '+str(iu.revision))
 				return 0
 			if update.is_delta:
 				#print('Writing delta update by '+str(update.writer_name))
@@ -433,7 +515,7 @@ class OutputBuffer(Buffer):
 			return 0
 		iu = self._iu_store[iu_resend_request_pack.uid]
 		with iu.revision_lock:
-			if iu_resend_request_pack.hidden_scope_name is not None and iu_resend_request_pack.hidden_scope_name is not '':
+			if iu_resend_request_pack.hidden_scope_name is not None and iu_resend_request_pack.hidden_scope_name != '':
 				informer = self._get_informer(iu_resend_request_pack.hidden_scope_name)
 				informer.publishData(iu)
 				return iu.revision
@@ -463,8 +545,9 @@ class OutputBuffer(Buffer):
 		if iu_category in self._informer_store:
 			LOGGER.info("Returning informer on scope "+"/ipaaca/channel/"+str(self._channel)+"/category/"+str(iu_category))
 			return self._informer_store[iu_category]
-		informer_iu = rsb.createInformer(
-				rsb.Scope("/ipaaca/channel/"+str(self._channel)+"/category/"+str(iu_category)),
+		be = ipaaca.backend.get_default_backend()
+		informer_iu = be.createInformer(
+				be.Scope("/ipaaca/channel/"+str(self._channel)+"/category/"+str(iu_category)),
 				config=self._participant_config,
 				dataType=object)
 		self._informer_store[iu_category] = informer_iu #new_tuple
@@ -477,6 +560,8 @@ class OutputBuffer(Buffer):
 			raise ipaaca.exception.IUPublishedError(iu)
 		if iu.buffer is not None:
 			raise ipaaca.exception.IUPublishedError(iu)
+		if iu.retracted:
+			raise ipaaca.exception.IURetractedError(iu)
 		if iu.access_mode != ipaaca.iu.IUAccessMode.MESSAGE:
 			# Messages are not really stored in the OutputBuffer
 			self._iu_store[iu.uid] = iu
@@ -484,12 +569,12 @@ class OutputBuffer(Buffer):
 		self._publish_iu(iu)
 
 	def remove(self, iu=None, iu_uid=None):
-		'''Remove the iu or an IU corresponding to iu_uid from the OutputBuffer, retracting it from the system.'''
+		'''Retracts an IU and removes it from the OutputBuffer.'''
 		if iu is None:
 			if iu_uid is None:
 				return None
 			else:
-				if iu_uid not in self. _iu_store:
+				if iu_uid not in self._iu_store:
 					raise ipaaca.exception.IUNotFoundError(iu_uid)
 				iu = self._iu_store[iu_uid]
 		# unpublish the IU
@@ -503,12 +588,35 @@ class OutputBuffer(Buffer):
 		informer.publishData(iu)
 
 	def _retract_iu(self, iu):
-		'''Retract (unpublish) an IU.'''
-		iu_retraction = ipaaca_pb2.IURetraction()
+		'''Retract an IU.'''
+		iu._retracted = True
+		iu_retraction = ipaaca.ipaaca_pb2.IURetraction()
 		iu_retraction.uid = iu.uid
 		iu_retraction.revision = iu.revision
 		informer = self._get_informer(iu._category)
 		informer.publishData(iu_retraction)
+	
+	def _retract_all_internal(self):
+		'''Retract all IUs without removal (for Buffer teardown).'''
+		for iu in self._iu_store.values():
+			if not iu._retracted:
+				self._retract_iu(iu)
+
+	def _deactivate_all_internal(self):
+		'''Deactivate all participants.'''
+		try:
+			self._server.deactivate()
+		except RuntimeError:
+			# Is raised if an already deactivated participant is 
+			# deactivated again
+			pass
+		for informer in self._informer_store.values():
+			try:
+				informer.deactivate()
+			except RuntimeError:
+				# Is raised if an already deactivated participant is 
+				# deactivated again
+				pass
 
 	def _send_iu_commission(self, iu, writer_name):
 		'''Send IU commission.
@@ -521,7 +629,7 @@ class OutputBuffer(Buffer):
 		'''
 		# a raw Protobuf object for IUCommission is produced
 		# (unlike updates, where we have an intermediate class)
-		iu_commission = ipaaca_pb2.IUCommission()
+		iu_commission = ipaaca.ipaaca_pb2.IUCommission()
 		iu_commission.uid = iu.uid
 		iu_commission.revision = iu.revision
 		iu_commission.writer_name = iu.owner_name if writer_name is None else writer_name

ipaacalib/python/src/ipaaca/config.py

+# -*- coding: utf-8 -*-
+
+# This file is part of IPAACA, the
+#  "Incremental Processing Architecture
+#   for Artificial Conversational Agents".
+#
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
+#                         CITEC, Bielefeld University
+#
+# http://opensource.cit-ec.de/projects/ipaaca/
+# http://purl.org/net/ipaaca
+#
+# This file may be licensed under the terms of of the
+# GNU Lesser General Public License Version 3 (the ``LGPL''),
+# or (at your option) any later version.
+#
+# Software distributed under the License is distributed
+# on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+# express or implied. See the LGPL for the specific language
+# governing rights and limitations.
+#
+# You should have received a copy of the LGPL along with this
+# program. If not, go to http://www.gnu.org/licenses/lgpl.html
+# or write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# The development of this software was supported by the
+# Excellence Cluster EXC 277 Cognitive Interaction Technology.
+# The Excellence Cluster EXC 277 is a grant of the Deutsche
+# Forschungsgemeinschaft (DFG) in the context of the German
+# Excellence Initiative.
+
+from __future__ import division, print_function
+
+import ipaaca.defaults
+import ipaaca.exception
+import ipaaca.iu
+import ipaaca.misc
+
+import os
+import re
+try:
+    import configparser
+except:
+    import ConfigParser as configparser
+
+
+LOGGER = ipaaca.misc.get_library_logger()
+
+__global_config = None
+
+class Config(object):
+    def __init__(self):
+        self._store = {}
+
+    def get_with_default(self, key, default_value, warn=False):
+        if key in self._store:
+            return self._store[key]
+        else:
+            notif = LOGGER.warning if warn else LOGGER.debug
+            notif('Config key '+str(key)+' not found, returning default of '+str(default_value))
+            return default_value
+    
+    def populate_from_global_sources(self):
+        self._store = {}
+        self.populate_from_any_conf_files()
+        self.populate_from_environment()
+        #self.populate_from_argv_overrides() # TODO IMPLEMENT_ME
+
+    def populate_from_any_conf_files(self):
+        globalconf = os.getenv('HOME', '')+'/.config/ipaaca.conf'
+        for filename in ['ipaaca.conf', globalconf]:
+            try:
+                f = open(filename, 'r')
+                c = configparser.ConfigParser()
+                c.readfp(f)
+                f.close()
+                LOGGER.info('Including configuration from '+filename)
+                for k,v in c.items('ipaaca'):
+                    self._store[k] = v
+                return
+            except:
+                pass
+        LOGGER.info('Could not load ipaaca.conf either here or in ~/.config')
+
+    def populate_from_environment(self):
+        for k, v in os.environ.items():
+            if k.startswith('IPAACA_'):
+                if re.match(r'^[A-Za-z0-9_]*$', k) is None:
+                    LOGGER.warning('Ignoring malformed environment key')
+                else:
+                    if len(v)>1023:
+                        LOGGER.warning('Ignoring long environment value')
+                    else:
+                        # remove initial IPAACA_ and transform key to dotted lowercase
+                        trans_key = k[7:].lower().replace('_', '.')
+                        self._store[trans_key] = v
+                        LOGGER.debug('Configured from environment: '+str(trans_key)+'="'+str(v)+'"')
+
+
+def get_global_config():
+    global __global_config
+    if __global_config is None:
+        __global_config = Config()
+        __global_config.populate_from_global_sources()
+    return __global_config
+

ipaacalib/python/src/ipaaca/converter.py

@@ -4,7 +4,7 @@
 #  "Incremental Processing Architecture
 #   for Artificial Conversational Agents".
 #
-# Copyright (c) 2009-2014 Social Cognitive Systems Group
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
 #                         CITEC, Bielefeld University
 #
 # http://opensource.cit-ec.de/projects/ipaaca/
@@ -34,9 +34,9 @@ from __future__ import division, print_function
 
 import collections
 
-import rsb.converter
+#import rsb.converter
 
-import ipaaca_pb2
+import ipaaca.ipaaca_pb2
 import ipaaca.defaults
 import ipaaca.exception
 import ipaaca.iu
@@ -45,230 +45,364 @@ import ipaaca.misc
 LOGGER = ipaaca.misc.get_library_logger()
 
 try:
-	import simplejson as json
+    import simplejson as json
 except ImportError:
-	import json
-	LOGGER.warn('INFO: Using module "json" instead of "simplejson". Install "simplejson" for better performance.')
+    import json
+    LOGGER.warn('INFO: Using module "json" instead of "simplejson". Install "simplejson" for better performance.')
 
 
 __all__ = [
-	'IntConverter',
-	'IUConverter',
-	'IULinkUpdate',
-	'IULinkUpdateConverter',
-	'IUPayloadUpdate',
-	'IUPayloadUpdateConverter',
-	'MessageConverter',
-]
-
-
-class IntConverter(rsb.converter.Converter):
-	"""Convert Python int objects to Protobuf ints and vice versa."""
-	def __init__(self, wireSchema="int", dataType=int):
-		super(IntConverter, self).__init__(bytearray, dataType, wireSchema)
-
-	def serialize(self, value):
-		pbo = ipaaca_pb2.IntMessage()
-		pbo.value = value
-		return bytearray(pbo.SerializeToString()), self.wireSchema
-
-	def deserialize(self, byte_stream, ws):
-		pbo = ipaaca_pb2.IntMessage()
-		pbo.ParseFromString( str(byte_stream) )
-		return pbo.value
-
-
-def pack_payload_entry(entry, key, value, _type=ipaaca.iu.IUPayloadType.JSON):
-	entry.key = key
-	if _type == ipaaca.iu.IUPayloadType.JSON: 
-		entry.value = json.dumps(value)
-	elif _type == ipaaca.iu.IUPayloadType.STR or _type == 'MAP':
-		entry.value = str(value)
-	else:
-		raise ipaaca.exception.IpaacaException('Asked to send payload entry with unsupported type "' +  _type + '".')
-	entry.type = _type
+        'IntConverter',
+        'IUConverter',
+        'IULinkUpdate',
+        'IULinkUpdateConverter',
+        'IUPayloadUpdate',
+        'IUPayloadUpdateConverter',
+        'MessageConverter',
+        'register_global_converter',
+    ]
+
+_LOW_LEVEL_WIRE_SCHEMA_MAP = None
+def LOW_LEVEL_WIRE_SCHEMA_FOR(abstractname):
+    '''Map the abstract wire schema name (was used in RSB) to a
+    transport-dependent magic to detect on the wire.
+    Here: a required protobuf field'''
+    global _LOW_LEVEL_WIRE_SCHEMA_MAP
+    if _LOW_LEVEL_WIRE_SCHEMA_MAP is None:
+        _LOW_LEVEL_WIRE_SCHEMA_MAP = {
+                int: ipaaca.ipaaca_pb2.WireTypeIntMessage,
+                ipaaca.iu.IU: ipaaca.ipaaca_pb2.WireTypeIU,
+                ipaaca.iu.Message: ipaaca.ipaaca_pb2.WireTypeMessageIU,
+                IUPayloadUpdate: ipaaca.ipaaca_pb2.WireTypeIUPayloadUpdate,
+                IULinkUpdate: ipaaca.ipaaca_pb2.WireTypeIULinkUpdate,
+                'int': ipaaca.ipaaca_pb2.WireTypeIntMessage,
+                'ipaaca-iu': ipaaca.ipaaca_pb2.WireTypeIU,
+                'ipaaca-messageiu': ipaaca.ipaaca_pb2.WireTypeMessageIU,
+                'ipaaca-iu-payload-update': ipaaca.ipaaca_pb2.WireTypeIUPayloadUpdate,
+                'ipaaca-iu-link-update': ipaaca.ipaaca_pb2.WireTypeIULinkUpdate,
+            }
+    return _LOW_LEVEL_WIRE_SCHEMA_MAP.get(abstractname)
+
+
+def __fail_no_type_converter():
+    raise ipaaca.exception.BackendSerializationError()
+
+class FailingDict(dict):
+    def __init__(self, error_class, *args, **kwargs):
+        super(FailingDict, self).__init__(*args, **kwargs)
+        self._error_class = error_class
+    def __getitem__(self, k):
+        if k in self:
+            return dict.__getitem__(self, k)
+        else:
+            raise self._error_class(k)
+
+# global converter / [un]marshaller store
+__converter_registry_by_type = FailingDict(ipaaca.exception.BackendSerializationError)
+__converter_registry_by_wire_schema = FailingDict(ipaaca.exception.BackendDeserializationError)
+
+def register_global_converter(converter):
+    global __converter_registry_by_type, __converter_registry_by_wire_schema
+    real_wire_schema = LOW_LEVEL_WIRE_SCHEMA_FOR(converter._wire_schema)
+    if real_wire_schema is None:
+        raise NotImplementedError('There is no entry in the _LOW_LEVEL_WIRE_SCHEMA_MAP for '+str(converter._wire_schema))
+    if real_wire_schema in __converter_registry_by_wire_schema:
+        raise ipaaca.exception.ConverterRegistrationError(real_wire_schema)
+    if converter._data_type in __converter_registry_by_type:
+        raise ipaaca.exception.ConverterRegistrationError(converter._data_type.__name__)
+    __converter_registry_by_type[converter._data_type] = converter
+    __converter_registry_by_wire_schema[real_wire_schema] = converter
+
+def deserialize(lowlevel_message):
+    pbo_outer = ipaaca.ipaaca_pb2.TransportLevelWrapper()
+    pbo_outer.ParseFromString(lowlevel_message)
+    type_ = pbo_outer.transport_message_type
+    #print('Received wire message type', type_)
+    if type_ in __converter_registry_by_wire_schema:
+        return __converter_registry_by_wire_schema[type_].deserialize(pbo_outer.raw_message, None)
+    else:
+        pbo = None
+        if type_ ==   ipaaca.ipaaca_pb2.WireTypeRemoteRequestResult:
+            pbo = ipaaca.ipaaca_pb2.RemoteRequestResult()
+        elif type_ == ipaaca.ipaaca_pb2.WireTypeIURetraction:
+            pbo = ipaaca.ipaaca_pb2.IURetraction()
+        elif type_ == ipaaca.ipaaca_pb2.WireTypeIUCommission:
+            pbo = ipaaca.ipaaca_pb2.IUCommission()
+        elif type_ == ipaaca.ipaaca_pb2.WireTypeIUResendRequest:
+            pbo = ipaaca.ipaaca_pb2.IUResendRequest()
+        elif type_ == ipaaca.ipaaca_pb2.WireTypeIUPayloadUpdateRequest:
+            pbo = ipaaca.ipaaca_pb2.IUPayloadUpdateRequest()
+        elif type_ == ipaaca.ipaaca_pb2.WireTypeIUCommissionRequest:
+            pbo = ipaaca.ipaaca_pb2.IUCommissionRequest()
+        elif type_ == ipaaca.ipaaca_pb2.WireTypeIULinkUpdateRequest:
+            pbo = ipaaca.ipaaca_pb2.IULinkUpdateRequest()
+        if pbo is None:
+            raise ipaaca.exception.BackendDeserializationError(type_)
+        else:
+            pbo.ParseFromString(pbo_outer.raw_message)
+            return pbo
+    raise ipaaca.exception.BackendDeserializationError(type_)
+
+def serialize(obj):
+    inner, type_ = None, None
+    if obj.__class__ in __converter_registry_by_type:
+        cls_ = obj.__class__
+        inner, wire = __converter_registry_by_type[obj.__class__].serialize(obj)
+        type_ = LOW_LEVEL_WIRE_SCHEMA_FOR(wire)
+    else:
+        cls_ = obj.__class__
+        if cls_ == ipaaca.ipaaca_pb2.RemoteRequestResult:
+            type_ = ipaaca.ipaaca_pb2.WireTypeRemoteRequestResult
+        elif cls_ == ipaaca.ipaaca_pb2.IURetraction:
+            type_ = ipaaca.ipaaca_pb2.WireTypeIURetraction
+        elif cls_ == ipaaca.ipaaca_pb2.IUCommission:
+            type_ = ipaaca.ipaaca_pb2.WireTypeIUCommission
+        elif cls_ == ipaaca.ipaaca_pb2.IUResendRequest:
+            type_ = ipaaca.ipaaca_pb2.WireTypeIUResendRequest
+        elif cls_ == ipaaca.ipaaca_pb2.IUPayloadUpdateRequest:
+            type_ = ipaaca.ipaaca_pb2.WireTypeIUPayloadUpdateRequest
+        elif cls_ == ipaaca.ipaaca_pb2.IUCommissionRequest:
+            type_ = ipaaca.ipaaca_pb2.WireTypeIUCommissionRequest
+        elif cls_ == ipaaca.ipaaca_pb2.IULinkUpdateRequest:
+            type_ = ipaaca.ipaaca_pb2.WireTypeIULinkUpdateRequest
+        if type_ is None:
+            raise ipaaca.exception.BackendSerializationError(cls_)
+        else:
+            inner = obj.SerializeToString()
+    pbo = ipaaca.ipaaca_pb2.TransportLevelWrapper()
+    pbo.transport_message_type = type_
+    pbo.raw_message = inner
+    return bytearray(pbo.SerializeToString())
+
+class ConverterBase(object):
+    '''Base for converters (to serialize and unserialize
+    data automatically depending on its Python type).'''
+    def __init__(self, substrate, data_type, wire_schema):
+        self._substrate = substrate
+        self._wire_schema = wire_schema
+        self._data_type = data_type
+        self.wireSchema = wire_schema  # added compat with RSB
+        #print('Made a ConverterBase with wire '+str(self._wire_schema)+' and data '+str(self._data_type))
+    def serialize(self, value):
+        raise NotImplementedError('NOT IMPLEMENTED for '   \
+                + self.__class__.__name__+': serialize')
+    def deserialize(self, stream, _UNUSED_override_wire_schema):
+        raise NotImplementedError('NOT IMPLEMENTED for '   \
+                + self.__class__.__name__+': deserialize')
+
+class IntConverter(ConverterBase):
+    """Convert Python int objects to Protobuf ints and vice versa."""
+    def __init__(self, wireSchema="int", dataType=None):
+        super(IntConverter, self).__init__(bytearray, int, wireSchema)
+
+    def serialize(self, value):
+        pbo = ipaaca.ipaaca_pb2.IntMessage()
+        pbo.value = value
+        return pbo.SerializeToString(), self.wireSchema
+
+    def deserialize(self, byte_stream, ws):
+        pbo = ipaaca.ipaaca_pb2.IntMessage()
+        pbo.ParseFromString(byte_stream)
+        return pbo.value
+
+
+def pack_payload_entry(entry, key, value, _type=None):
+    #if _type is None: _type=ipaaca.iu.IUPayloadType.JSON
+    entry.key = key
+    if _type is None or _type == ipaaca.iu.IUPayloadType.JSON: 
+        entry.value = json.dumps(value)
+    elif _type == ipaaca.iu.IUPayloadType.STR or _type == 'MAP':
+        entry.value = str(value)
+    else:
+        raise ipaaca.exception.IpaacaException('Asked to send payload entry with unsupported type "' +  _type + '".')
+    entry.type = _type
 
 
 def unpack_payload_entry(entry):
-	# We assume that the only transfer types are 'STR' or 'JSON'. Both are transparently handled by json.loads
-	if entry.type == ipaaca.iu.IUPayloadType.JSON:
-		return json.loads(entry.value)
-	elif entry.type == ipaaca.iu.IUPayloadType.STR or entry.type == 'str':
-		return entry.value
-	else:
-		LOGGER.warn('Received payload entry with unsupported type "' + entry.type + '".')
-		return entry.value
-
-
-class IUConverter(rsb.converter.Converter):
-	'''
-	Converter class for Full IU representations
-	wire:bytearray <-> wire-schema:ipaaca-full-iu <-> class ipaacaRSB.IU
-	'''
-	def __init__(self, wireSchema="ipaaca-iu", dataType=ipaaca.iu.IU):
-		super(IUConverter, self).__init__(bytearray, dataType, wireSchema)
-		self._access_mode = ipaaca_pb2.IU.PUSH
-		self._remote_data_type = ipaaca.iu.RemotePushIU
-
-	def serialize(self, iu):
-		pbo = ipaaca_pb2.IU()
-		pbo.access_mode = self._access_mode
-		pbo.uid = iu._uid
-		pbo.revision = iu._revision
-		pbo.category = iu._category
-		pbo.payload_type = iu._payload_type
-		pbo.owner_name = iu._owner_name
-		pbo.committed = iu._committed
-		pbo.read_only = iu._read_only
-		for k, v in iu._payload.iteritems():
-			entry = pbo.payload.add()
-			pack_payload_entry(entry, k, v, iu.payload_type)
-		for type_ in iu._links.keys():
-			linkset = pbo.links.add()
-			linkset.type = type_
-			linkset.targets.extend(iu._links[type_])
-		return bytearray(pbo.SerializeToString()), self.wireSchema
-
-	def deserialize(self, byte_stream, ws):
-		pbo = ipaaca_pb2.IU()
-		pbo.ParseFromString(str(byte_stream))
-		_payload = {}
-		for entry in pbo.payload:
-			_payload[entry.key] = unpack_payload_entry(entry)
-		_links = collections.defaultdict(set)
-		for linkset in pbo.links:
-			for target_uid in linkset.targets:
-				_links[linkset.type].add(target_uid)
-		return self._remote_data_type(
-			uid=pbo.uid,
-			revision=pbo.revision,
-			read_only = pbo.read_only,
-			owner_name = pbo.owner_name,
-			category = pbo.category,
-			payload_type = 'str' if pbo.payload_type is 'MAP' else pbo.payload_type,
-			committed = pbo.committed,
-			payload=_payload,
-			links=_links)
+    # We assume that the only transfer types are 'STR' or 'JSON'. Both are transparently handled by json.loads
+    if entry.type == ipaaca.iu.IUPayloadType.JSON:
+        return json.loads(entry.value)
+    elif entry.type == ipaaca.iu.IUPayloadType.STR or entry.type == 'str':
+        return entry.value
+    else:
+        LOGGER.warn('Received payload entry with unsupported type "' + entry.type + '".')
+        return entry.value
+
+
+class IUConverter(ConverterBase):
+    '''
+    Converter class for Full IU representations
+    wire:bytearray <-> wire-schema:ipaaca-full-iu <-> class ipaacaRSB.IU
+    '''
+    def __init__(self, wireSchema="ipaaca-iu", dataType=None): #ipaaca.iu.IU):
+        super(IUConverter, self).__init__(bytearray, ipaaca.iu.IU if dataType is None else dataType, wireSchema)
+        self._access_mode = ipaaca.ipaaca_pb2.IU.PUSH
+        self._remote_data_type = ipaaca.iu.RemotePushIU
+
+    def serialize(self, iu):
+        pbo = ipaaca.ipaaca_pb2.IU()
+        pbo.access_mode = self._access_mode
+        pbo.uid = iu._uid
+        pbo.revision = iu._revision
+        pbo.category = iu._category
+        pbo.payload_type = iu._payload_type
+        pbo.owner_name = iu._owner_name
+        pbo.committed = iu._committed
+        pbo.read_only = iu._read_only
+        for k, v in iu._payload.items():
+            entry = pbo.payload.add()
+            pack_payload_entry(entry, k, v, iu.payload_type)
+        for type_ in iu._links.keys():
+            linkset = pbo.links.add()
+            linkset.type = type_
+            linkset.targets.extend(iu._links[type_])
+        return pbo.SerializeToString(), self.wireSchema
+
+    def deserialize(self, byte_stream, ws):
+        pbo = ipaaca.ipaaca_pb2.IU()
+        pbo.ParseFromString(byte_stream)
+        _payload = {}
+        for entry in pbo.payload:
+            _payload[entry.key] = unpack_payload_entry(entry)
+        _links = collections.defaultdict(set)
+        for linkset in pbo.links:
+            for target_uid in linkset.targets:
+                _links[linkset.type].add(target_uid)
+        return self._remote_data_type(
+            uid=pbo.uid,
+            revision=pbo.revision,
+            read_only = pbo.read_only,
+            owner_name = pbo.owner_name,
+            category = pbo.category,
+            payload_type = 'str' if pbo.payload_type == 'MAP' else pbo.payload_type,
+            committed = pbo.committed,
+            payload=_payload,
+            links=_links)
 
 
 class MessageConverter(IUConverter):
-	'''
-	Converter class for Full IU representations
-	wire:bytearray <-> wire-schema:ipaaca-full-iu <-> class ipaacaRSB.IU
-	'''
-	def __init__(self, wireSchema="ipaaca-messageiu", dataType=ipaaca.iu.Message):
-		super(MessageConverter, self).__init__(wireSchema, dataType)
-		self._access_mode = ipaaca_pb2.IU.MESSAGE
-		self._remote_data_type = ipaaca.iu.RemoteMessage
+    '''
+    Converter class for Full IU representations
+    wire:bytearray <-> wire-schema:ipaaca-full-iu <-> class ipaacaRSB.IU
+    '''
+    def __init__(self, wireSchema="ipaaca-messageiu", dataType=None): #ipaaca.iu.Message):
+        super(MessageConverter, self).__init__(wireSchema, ipaaca.iu.Message)
+        self._access_mode = ipaaca.ipaaca_pb2.IU.MESSAGE
+        self._remote_data_type = ipaaca.iu.RemoteMessage
 
 
 class IULinkUpdate(object):
 
-	def __init__(self, uid, revision, is_delta, writer_name="undef", new_links=None, links_to_remove=None):
-		super(IULinkUpdate, self).__init__()
-		self.uid = uid
-		self.revision = revision
-		self.writer_name = writer_name
-		self.is_delta = is_delta
-		self.new_links = collections.defaultdict(set) if new_links is None else collections.defaultdict(set, new_links)
-		self.links_to_remove = collections.defaultdict(set) if links_to_remove is None else collections.defaultdict(set, links_to_remove)
-
-	def __str__(self):
-		s =  'LinkUpdate(' + 'uid=' + self.uid + ', '
-		s += 'revision='+str(self.revision)+', '
-		s += 'writer_name='+str(self.writer_name)+', '
-		s += 'is_delta='+str(self.is_delta)+', '
-		s += 'new_links = '+str(self.new_links)+', '
-		s += 'links_to_remove = '+str(self.links_to_remove)+')'
-		return s
-
-
-class IULinkUpdateConverter(rsb.converter.Converter):
-	
-	def __init__(self, wireSchema="ipaaca-iu-link-update", dataType=IULinkUpdate):
-		super(IULinkUpdateConverter, self).__init__(bytearray, dataType, wireSchema)
-
-	def serialize(self, iu_link_update):
-		pbo = ipaaca_pb2.IULinkUpdate()
-		pbo.uid = iu_link_update.uid
-		pbo.writer_name = iu_link_update.writer_name
-		pbo.revision = iu_link_update.revision
-		for type_ in iu_link_update.new_links.keys():
-			linkset = pbo.new_links.add()
-			linkset.type = type_
-			linkset.targets.extend(iu_link_update.new_links[type_])
-		for type_ in iu_link_update.links_to_remove.keys():
-			linkset = pbo.links_to_remove.add()
-			linkset.type = type_
-			linkset.targets.extend(iu_link_update.links_to_remove[type_])
-		pbo.is_delta = iu_link_update.is_delta
-		return bytearray(pbo.SerializeToString()), self.wireSchema
-
-	def deserialize(self, byte_stream, ws):
-		type = self.getDataType()
-		if type == IULinkUpdate:
-			pbo = ipaaca_pb2.IULinkUpdate()
-			pbo.ParseFromString( str(byte_stream) )
-			LOGGER.debug('received an IULinkUpdate for revision '+str(pbo.revision))
-			iu_link_up = IULinkUpdate( uid=pbo.uid, revision=pbo.revision, writer_name=pbo.writer_name, is_delta=pbo.is_delta)
-			for entry in pbo.new_links:
-				iu_link_up.new_links[str(entry.type)] = set(entry.targets)
-			for entry in pbo.links_to_remove:
-				iu_link_up.links_to_remove[str(entry.type)] = set(entry.targets)
-			return iu_link_up
-		else:
-			raise ValueError("Inacceptable dataType %s" % type)
+    def __init__(self, uid, revision, is_delta, writer_name="undef", new_links=None, links_to_remove=None, request_uid=None, request_endpoint=None):
+        super(IULinkUpdate, self).__init__()
+        self.uid = uid
+        self.revision = revision
+        self.writer_name = writer_name
+        self.is_delta = is_delta
+        self.new_links = collections.defaultdict(set) if new_links is None else collections.defaultdict(set, new_links)
+        self.links_to_remove = collections.defaultdict(set) if links_to_remove is None else collections.defaultdict(set, links_to_remove)
+        self.request_uid = request_uid
+        self.request_endpoint = request_endpoint
+
+    def __str__(self):
+        s =  'LinkUpdate(' + 'uid=' + self.uid + ', '
+        s += 'revision='+str(self.revision)+', '
+        s += 'writer_name='+str(self.writer_name)+', '
+        s += 'is_delta='+str(self.is_delta)+', '
+        s += 'new_links = '+str(self.new_links)+', '
+        s += 'links_to_remove = '+str(self.links_to_remove)+')'
+        return s
+
+
+class IULinkUpdateConverter(ConverterBase):
+    
+    def __init__(self, wireSchema="ipaaca-iu-link-update", dataType=None): #=IULinkUpdate):
+        super(IULinkUpdateConverter, self).__init__(bytearray, IULinkUpdate, wireSchema)
+
+    def serialize(self, iu_link_update):
+        pbo = ipaaca.ipaaca_pb2.IULinkUpdate()
+        pbo.uid = iu_link_update.uid
+        pbo.writer_name = iu_link_update.writer_name
+        pbo.revision = iu_link_update.revision
+        if iu_link_update.request_uid:
+            pbo.request_uid = iu_link_update.request_uid
+        if iu_link_update.request_endpoint:
+            pbo.request_endpoint = iu_link_update.request_endpoint
+        for type_ in iu_link_update.new_links.keys():
+            linkset = pbo.new_links.add()
+            linkset.type = type_
+            linkset.targets.extend(iu_link_update.new_links[type_])
+        for type_ in iu_link_update.links_to_remove.keys():
+            linkset = pbo.links_to_remove.add()
+            linkset.type = type_
+            linkset.targets.extend(iu_link_update.links_to_remove[type_])
+        pbo.is_delta = iu_link_update.is_delta
+        return pbo.SerializeToString(), self.wireSchema
+
+    def deserialize(self, byte_stream, ws):
+        pbo = ipaaca.ipaaca_pb2.IULinkUpdate()
+        pbo.ParseFromString(byte_stream)
+        LOGGER.debug('received an IULinkUpdate for revision '+str(pbo.revision))
+        iu_link_up = IULinkUpdate( uid=pbo.uid, revision=pbo.revision, writer_name=pbo.writer_name, is_delta=pbo.is_delta, request_uid=pbo.request_uid, request_endpoint=pbo.request_endpoint)
+        for entry in pbo.new_links:
+                iu_link_up.new_links[str(entry.type)] = set(entry.targets)
+        for entry in pbo.links_to_remove:
+                iu_link_up.links_to_remove[str(entry.type)] = set(entry.targets)
+        return iu_link_up
 
 
 class IUPayloadUpdate(object):
 
-	def __init__(self, uid, revision, is_delta, payload_type, writer_name="undef", new_items=None, keys_to_remove=None):
-		super(IUPayloadUpdate, self).__init__()
-		self.uid = uid
-		self.revision = revision
-		self.payload_type = payload_type
-		self.writer_name = writer_name
-		self.is_delta = is_delta
-		self.new_items = {} if new_items is None else new_items
-		self.keys_to_remove = [] if keys_to_remove is None else keys_to_remove
-
-	def __str__(self):
-		s =  'PayloadUpdate(' + 'uid=' + self.uid + ', '
-		s += 'revision='+str(self.revision)+', '
-		s += 'writer_name='+str(self.writer_name)+', '
-		s += 'payload_type='+str(self.payload_type)+', '
-		s += 'is_delta='+str(self.is_delta)+', '
-		s += 'new_items = '+str(self.new_items)+', '
-		s += 'keys_to_remove = '+str(self.keys_to_remove)+')'
-		return s
-
-
-class IUPayloadUpdateConverter(rsb.converter.Converter):
-	def __init__(self, wireSchema="ipaaca-iu-payload-update", dataType=IUPayloadUpdate):
-		super(IUPayloadUpdateConverter, self).__init__(bytearray, dataType, wireSchema)
-
-	def serialize(self, iu_payload_update):
-		pbo = ipaaca_pb2.IUPayloadUpdate()
-		pbo.uid = iu_payload_update.uid
-		pbo.writer_name = iu_payload_update.writer_name
-		pbo.revision = iu_payload_update.revision
-		for k, v in iu_payload_update.new_items.items():
-			entry = pbo.new_items.add()
-			pack_payload_entry(entry, k, v, iu_payload_update.payload_type)
-		pbo.keys_to_remove.extend(iu_payload_update.keys_to_remove)
-		pbo.is_delta = iu_payload_update.is_delta
-		return bytearray(pbo.SerializeToString()), self.wireSchema
-
-	def deserialize(self, byte_stream, ws):
-		type = self.getDataType()
-		if type == IUPayloadUpdate:
-			pbo = ipaaca_pb2.IUPayloadUpdate()
-			pbo.ParseFromString( str(byte_stream) )
-			LOGGER.debug('received an IUPayloadUpdate for revision '+str(pbo.revision))
-			iu_up = IUPayloadUpdate( uid=pbo.uid, revision=pbo.revision, payload_type=None, writer_name=pbo.writer_name, is_delta=pbo.is_delta)
-			for entry in pbo.new_items:
-				iu_up.new_items[entry.key] = unpack_payload_entry(entry)
-			iu_up.keys_to_remove = pbo.keys_to_remove[:]
-			return iu_up
-		else:
-			raise ValueError("Inacceptable dataType %s" % type)
+    def __init__(self, uid, revision, is_delta, payload_type, writer_name="undef", new_items=None, keys_to_remove=None, request_uid=None, request_endpoint=None):
+        super(IUPayloadUpdate, self).__init__()
+        self.uid = uid
+        self.revision = revision
+        self.payload_type = payload_type
+        self.writer_name = writer_name
+        self.is_delta = is_delta
+        self.new_items = {} if new_items is None else new_items
+        self.keys_to_remove = [] if keys_to_remove is None else keys_to_remove
+        self.request_uid = request_uid
+        self.request_endpoint = request_endpoint
+
+    def __str__(self):
+        s =  'PayloadUpdate(' + 'uid=' + self.uid + ', '
+        s += 'revision='+str(self.revision)+', '
+        s += 'writer_name='+str(self.writer_name)+', '
+        s += 'payload_type='+str(self.payload_type)+', '
+        s += 'is_delta='+str(self.is_delta)+', '
+        s += 'new_items = '+str(self.new_items)+', '
+        s += 'keys_to_remove = '+str(self.keys_to_remove)+')'
+        return s
+
+
+class IUPayloadUpdateConverter(ConverterBase):
+    def __init__(self, wireSchema="ipaaca-iu-payload-update", dataType=None):
+        super(IUPayloadUpdateConverter, self).__init__(bytearray, IUPayloadUpdate, wireSchema)
+
+    def serialize(self, iu_payload_update):
+        pbo = ipaaca.ipaaca_pb2.IUPayloadUpdate()
+        pbo.uid = iu_payload_update.uid
+        pbo.writer_name = iu_payload_update.writer_name
+        pbo.revision = iu_payload_update.revision
+        if iu_payload_update.request_uid:
+            pbo.request_uid = iu_payload_update.request_uid
+        if iu_payload_update.request_endpoint:
+            pbo.request_endpoint = iu_payload_update.request_endpoint
+        for k, v in iu_payload_update.new_items.items():
+            entry = pbo.new_items.add()
+            pack_payload_entry(entry, k, v, iu_payload_update.payload_type)
+        pbo.keys_to_remove.extend(iu_payload_update.keys_to_remove)
+        pbo.is_delta = iu_payload_update.is_delta
+        return pbo.SerializeToString(), self.wireSchema
+
+    def deserialize(self, byte_stream, ws):
+        pbo = ipaaca.ipaaca_pb2.IUPayloadUpdate()
+        pbo.ParseFromString(byte_stream)
+        LOGGER.debug('received an IUPayloadUpdate for revision '+str(pbo.revision))
+        iu_up = IUPayloadUpdate( uid=pbo.uid, revision=pbo.revision, payload_type=None, writer_name=pbo.writer_name, is_delta=pbo.is_delta, request_uid=pbo.request_uid, request_endpoint=pbo.request_endpoint)
+        for entry in pbo.new_items:
+            iu_up.new_items[entry.key] = unpack_payload_entry(entry)
+        iu_up.keys_to_remove = pbo.keys_to_remove[:]
+        return iu_up
+

ipaacalib/python/src/ipaaca/defaults.py

@@ -4,7 +4,7 @@
 #  "Incremental Processing Architecture
 #   for Artificial Conversational Agents".
 #
-# Copyright (c) 2009-2014 Social Cognitive Systems Group
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
 #                         CITEC, Bielefeld University
 #
 # http://opensource.cit-ec.de/projects/ipaaca/
@@ -33,6 +33,15 @@
 IPAACA_DEFAULT_CHANNEL = 'default'
 
 IPAACA_LOGGER_NAME = 'ipaaca'
+
 IPAACA_DEFAULT_LOGGING_LEVEL = 'WARNING'
 
 IPAACA_DEFAULT_IU_PAYLOAD_TYPE = 'JSON' # one of ipaaca.iu.IUPayloadType
+
+IPAACA_DEFAULT_RSB_HOST = None
+
+IPAACA_DEFAULT_RSB_PORT = None
+
+IPAACA_DEFAULT_RSB_TRANSPORT = None
+
+IPAACA_DEFAULT_RSB_SOCKET_SERVER = None

ipaacalib/python/src/ipaaca/exception.py

@@ -4,7 +4,7 @@
 #  "Incremental Processing Architecture
 #   for Artificial Conversational Agents".
 #
-# Copyright (c) 2009-2014 Social Cognitive Systems Group
+# Copyright (c) 2009-2022 Social Cognitive Systems Group
 #                         CITEC, Bielefeld University
 #
 # http://opensource.cit-ec.de/projects/ipaaca/
@@ -48,6 +48,35 @@ __all__ = [
 
 class IpaacaError(Exception): pass
 
+class BackendInitializationError(IpaacaError):
+    """Error indicating that type marshalling cannot proceed
+    because no matching converter is known."""
+    def __init__(self, name=''):
+        super(BackendInitializationError, self).__init__(    \
+                'Failed to initialize selected backend '+str(name))
+
+class BackendSerializationError(IpaacaError):
+    """Error indicating that type marshalling cannot proceed
+    because no matching converter is known."""
+    def __init__(self, typ):
+        super(BackendSerializationError, self).__init__(    \
+                'Could not serialize type ' + str(typ.__name__)  \
+                + ' - no converter registered.')
+
+class BackendDeserializationError(IpaacaError):
+    """Error indicating that type unmarshalling cannot proceed
+    because no matching converter is known."""
+    def __init__(self, wire_schema):
+        super(BackendDeserializationError, self).__init__(           \
+                'Could not deserialize wire format "' + str(wire_schema) \
+                + '" - no converter registered.')
+
+class ConverterRegistrationError(IpaacaError):
+    '''Error indicating that a type or wire schema already had a registered converter.'''
+    def __init__(self, type_name_or_schema):
+        super(ConverterRegistrationError, self).__init__(
+                'Failed to register a converter: we already have one for ' \
+                + str(type_name_or_schema))
 
 class IUCommittedError(IpaacaError):
 	"""Error indicating that an IU is immutable because it has been committed to."""
@@ -82,13 +111,26 @@ class IUPublishedError(IpaacaError):
 class IUReadOnlyError(IpaacaError):
 	"""Error indicating that an IU is immutable because it is 'read only'."""
 	def __init__(self, iu):
-		super(IUReadOnlyError, self).__init__('Writing to IU ' + str(iu.uid) + ' failed -- it is read-only.')
+		super(IUReadOnlyError, self).__init__(
+			'Writing to IU ' + str(iu.uid) + ' failed -- it is read-only.')
 
 
 class IUResendRequestFailedError(IpaacaError):
 	"""Error indicating that a remote IU resend failed."""
+	def __init__(self, iu_uid):
+		super(IUResendRequestFailedError, self).__init__(
+			'Remote resend failed for IU ' + str(iu_uid))
+
+class IUResendRequestRemoteServerUnknownError(IpaacaError):
+	"""Error indicating that a remote IU resend failed."""
+	def __init__(self, iu_uid):
+		super(IUResendRequestRemoteServerUnknownError, self).__init__(
+			'Remote resend request: remote server unknown for IU ' + str(iu_uid))
+
+class IURetractedError(IpaacaError):
+	"""Error indicating that an IU has been retracted."""
 	def __init__(self, iu):
-		super(IUResendFailedError, self).__init__('Remote resend failed for IU ' + str(iu.uid) + '.')
+		super(IURetractedError, self).__init__('Writing to IU ' + str(iu.uid) + ' failed -- it has been retracted.')
 
 
 class IUUpdateFailedError(IpaacaError):