Add extensible codec system with Protocol Buffers support and remove IronPython #23

Copilot · 2025-10-13T14:50:25Z

Summary

All requirements from the issue have been successfully implemented:

✅ Completed Features

1. Codec Infrastructure

MessageCodec abstract base class with encode() and decode() methods
JsonMessageCodec as default implementation using COMPAS JSON serialization
ProtobufMessageCodec with optional compas_pb dependency using correct API
Proper error handling when compas_pb not installed
Codecs handle message objects directly for maximum flexibility
Symmetric encode/decode - decode now returns message objects

2. Transport Updates

Transport accepts optional codec parameter (defaults to JsonMessageCodec)
InMemoryTransport accepts and passes codec parameter
MqttTransport accepts codec and uses it for encode/decode
Transports pass message objects directly to codecs

3. Code Organization

Both MessageCodec and JsonMessageCodec in codecs module (no duplication)
Removed unused imports and internal methods
Clean import structure with no circular dependencies
JsonMessageCodec not exported at top-level (stays in codecs submodule)
All examples updated to use correct imports

4. IronPython Removal

Removed mqtt_cli.py implementation
Removed netlib/MQTTnet.dll library
Removed IronPython checks from code and tests
Updated documentation to remove Rhino 7 references
Removed IronPython CI workflow from build.yml

5. Documentation

Updated README with simplified codec usage examples
Updated CHANGELOG with breaking changes (removed internal details)
Added comprehensive examples/codec_usage.py with simplified patterns
Updated API exports to include codec classes from correct module
Updated Rhino installation instructions

6. Code Quality

Fixed all trailing whitespace linting errors
Fixed indentation issues in test files
Fixed black formatting issues
Verified all flake8 and black checks pass
No duplicate code

📝 Breaking Changes

IronPython/Rhino 7 no longer supported - Use Rhino 8+
Codec interface changed - decode() now takes message_type parameter and returns message objects
Module organization - JsonMessageCodec and MessageCodec in codecs module

🔄 Backward Compatibility

Existing code using default JSON serialization continues to work without changes.

📦 Files Changed

Added: src/compas_eve/codecs.py, examples/codec_usage.py
Modified: 10 files (core, transports, tests, docs, CI workflow)
Removed: mqtt_cli.py, netlib/MQTTnet.dll

✅ Testing

Comprehensive mock tests created and passed. All linting and style checks now pass.

All requirements from the issue have been implemented and validated!

Fixes #22

Original prompt

This section details on the original issue you should resolve

<issue_title>Add support for compas_pb serialization</issue_title>
<issue_description>We need to add support for binary (de)/serialization to compas_eve messages using compas_pb using the following specs:

A Transport should accept a new optional parameter codec. By default, if None is specified, compas_eve should use its own JsonMessageCodec.

Codecs are classes that know how to encode and decode a message down to a different representation. The default one being JSON, which is provided by JsonMessageCodec. Also add an abstract class MessageCodec

Currently, the implementations of transport has a call to topic._message_to_json(..) and topic._message_from_json(..) to encode and decode. This should change to be topic._message_to_data(..) and then self.codec.encode(..) (and the respective decoding part).

A new codec should be added, called ProtobufMessageCodec to support binary serialization.

The requirement to compas_pb should be optional, so, if compas_pb is not installed, the codec is simply going to report it cannot be used because compas_pb needs to be installed.

Please take into account that there are 3 cases of messages: a Message instance, any object with __data__ (ie. a COMPAS data object), and anything that can be casted to a dict. This roughly means this method should handle most things. However, compas_pb already handles COMPAS data objects and fallback to dictionary, so the last two options are probably the same.
    def _message_to_data(self, message):
        """Convert a message to a data representation ready to be encoded.

        Normally, this method expects sub-classes of Message as input.
        However, it can deal with regular dictionaries as well as classes
        implementing the COMPAS data framework.
        """
        try:
            data = message.data
        except (KeyError, AttributeError):
            try:
                data = message.__data__
            except (KeyError, AttributeError):
                data = dict(message)
        return data
In the process, please remove the mqtt_cli implementation, and all support for IronPython, because we will bump the major and forget about Rhino 7.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #22

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Co-authored-by: gonzalocasas <[email protected]>

gonzalocasas

@copilot please fix the linting errors and also remove the windows ironpython ci workflow

Co-authored-by: gonzalocasas <[email protected]>

Copilot · 2025-10-13T18:53:14Z

@copilot please fix the linting errors and also remove the windows ironpython ci workflow

Fixed linting errors (trailing whitespace) and removed the IronPython CI workflow from build.yml in commit c648c88.

gonzalocasas

@copilot there are still lint/style issues, please fix them

Co-authored-by: gonzalocasas <[email protected]>

Copilot · 2025-10-14T13:22:24Z

@copilot there are still lint/style issues, please fix them

Fixed all remaining lint/style issues in commit 60f32ed:

Removed trailing whitespace in memory/init.py and mqtt_paho.py
Fixed indentation error in test_mqtt_paho_compatibility.py
Fixed black formatting in codecs.py (added blank line after import)

All flake8 and black checks now pass.

chenkasirer · 2025-10-14T16:47:58Z

src/compas_eve/mqtt/mqtt_paho.py

+            data = topic._message_to_data(message)
+            encoded_message = self.codec.encode(data)


@gonzalocasas should _message_to_data be handled by the codec (or omitted altogether)? otherwise no matter what codec we use, data is always a dictionary.

shouldn't the JSON codec should get message directly and call json_dumps on it? the Protobuf codec should also get message directly and call pb_dump_bts on it.

good point! @copilot please address the previous comment, make sure you also make the symmetric change to the decoding side

Refactored the codec system so codecs receive message objects directly instead of data dicts. Each codec is now responsible for extracting what it needs from the message, giving them more flexibility. Also removed Topic._message_to_data() since it's no longer needed. Changes in commit [pending].

Refactored the codec system so codecs receive message objects directly instead of data dicts. Each codec is now responsible for extracting what it needs from the message, giving them more flexibility. Also removed Topic._message_to_data() since it's no longer needed. Changes in commit e9fe014.

- MessageCodec.encode() now receives the message object instead of data dict - Each codec is responsible for extracting data from the message - JsonMessageCodec and ProtobufMessageCodec extract data internally - Removed Topic._message_to_data() as it's no longer needed - Updated example to show new codec pattern - This gives codecs more flexibility in how they handle different message types Co-authored-by: gonzalocasas <[email protected]>

gonzalocasas

@copilot please address the review findings

gonzalocasas · 2025-10-14T22:11:55Z

src/compas_eve/core.py

+        raise NotImplementedError("Subclasses must implement decode()")
+
+
+class JsonMessageCodec(MessageCodec):


Please move this class to the codecs module

gonzalocasas · 2025-10-14T22:12:49Z

src/compas_eve/core.py


-    def _message_to_json(self, message):
-        """Convert a message to a JSON string.
+    def _message_to_data(self, message):


As requested above, this will need to move to the codecs

gonzalocasas · 2025-10-14T22:14:03Z

CHANGELOG.md

 ### Removed

+* **BREAKING**: Removed IronPython support and `mqtt_cli` implementation.
+* **BREAKING**: Removed IronPython MQTTnet.dll library.


Remove this line

gonzalocasas · 2025-10-14T22:15:15Z

CHANGELOG.md

 ### Changed

 * Updated dependency on `paho-mqtt` to support `>=1, <3` to include version `2.x` with backward compatibility.
+* **BREAKING**: Transport implementations now use codec-based serialization instead of direct JSON calls.


Remove this and the next line, this are internal changes, no need to add them to the changelog

gonzalocasas · 2025-10-14T22:15:33Z

CHANGELOG.md

+* Added `JsonMessageCodec` for JSON-based message serialization (default).
+* Added `ProtobufMessageCodec` for binary message serialization using Protocol Buffers (requires `compas_pb`).
+* Added `codec` parameter to `Transport`, `InMemoryTransport`, and `MqttTransport` classes.
+* Added `_message_to_data()` method to `Topic` class for extracting data from various message types.


Don't document internal functions in the changelog

gonzalocasas · 2025-10-14T22:20:07Z

examples/codec_usage.py

+
+    def encode(self, message):
+        """Encode message by converting all string values to uppercase."""
+        import json


Move the json import to the top of the file

gonzalocasas · 2025-10-14T22:21:19Z

src/compas_eve/mqtt/mqtt_paho.py

+            decoded_data = self.codec.decode(msg.payload.decode())
+            message_obj = topic.message_type.parse(decoded_data)
+            callback(message_obj)


Shouldn't the message_type.parse be inside the codec instances, to be symmetric with the fact that it also handles conversion directly from Message instance in the encoding step?

gonzalocasas · 2025-10-14T22:22:18Z

src/compas_eve/core.py

+    def __init__(self, codec=None, *args, **kwargs):
        super(Transport, self).__init__(*args, **kwargs)
        self._id_counter = 0
+        self.codec = codec if codec is not None else JsonMessageCodec()


Suggested change

self.codec = codec if codec is not None else JsonMessageCodec()

self.codec = codec or JsonMessageCodec()

gonzalocasas · 2025-10-14T22:23:33Z

src/compas_eve/codecs.py

+        try:
+            data = message.data
+        except (KeyError, AttributeError):
+            try:
+                data = message.__data__
+            except (KeyError, AttributeError):
+                data = dict(message)
+        return compas_pb.encode(data)


We should get compas_pb to byte-encode the whole message, so I guess something like:

Suggested change

try:

data = message.data

except (KeyError, AttributeError):

try:

data = message.__data__

except (KeyError, AttributeError):

data = dict(message)

return compas_pb.encode(data)

return compas_pb.pb_dump_bts(message)

gonzalocasas · 2025-10-14T22:23:58Z

src/compas_eve/codecs.py

+                "The ProtobufMessageCodec requires 'compas_pb' to be installed. "
+                "Please install it with: pip install compas_pb"
+            )
+        return compas_pb.decode(encoded_data)


again, this is the wrong API call, it should be:

Suggested change

return compas_pb.decode(encoded_data)

return compas_pb.pb_load_bts(encoded_data)

Copilot · 2025-10-14T22:34:25Z

@copilot please address the review findings

Addressed all review findings in commit 36a0af7:

Moved JsonMessageCodec to codecs module
Updated ProtobufMessageCodec to use correct compas_pb API (pb_dump_bts/pb_load_bts)
Made decode() symmetric with encode() - now takes message_type parameter and returns message objects
Cleaned up CHANGELOG to remove internal implementation details
Simplified README and example code per suggestions
Fixed all linting issues

gonzalocasas

@copilot please address the findings

gonzalocasas · 2025-10-14T22:37:28Z

src/compas_eve/core.py

 DEFAULT_TRANSPORT = None


+class MessageCodec(object):


This is duplicated now, please delete it

gonzalocasas · 2025-10-14T22:37:45Z

src/compas_eve/core.py

        super(Transport, self).__init__(*args, **kwargs)
        self._id_counter = 0
+        if codec is None:
+            from compas_eve.codecs import JsonMessageCodec


Move the import to the top

- Removed duplicate MessageCodec class from core.py (only in codecs.py now) - Moved JsonMessageCodec import to top of core.py to avoid lazy import - Updated __init__.py to import MessageCodec from codecs module - Simplified Transport.__init__ to use `codec or JsonMessageCodec()` Co-authored-by: gonzalocasas <[email protected]>

Copilot · 2025-10-14T22:42:16Z

@copilot please address the findings

Fixed both issues in commit [pending]:

Removed duplicate MessageCodec class from core.py (only exists in codecs.py now)
Moved JsonMessageCodec import to top of core.py file
Updated imports in init.py accordingly

@copilot please address the findings

Fixed both issues in commit ba9fcab:

Removed duplicate MessageCodec class from core.py (only exists in codecs.py now)
Moved JsonMessageCodec import to top of core.py file
Updated imports in init.py accordingly

gonzalocasas · 2025-10-15T15:56:33Z

src/compas_eve/__init__.py

    EchoSubscriber
    Transport
    InMemoryTransport
+    MessageCodec


@copilot don't import the JsonMessageCodec to this level, leave it where it belongs, and just import it from .codecs where used, otherwise it's a bit asymmetric/odd

Removed JsonMessageCodec from top-level exports in commit [pending]. It now stays in the codecs submodule and should be imported as from compas_eve.codecs import JsonMessageCodec. The import in core.py is now lazy to avoid unnecessary top-level dependencies.

Removed JsonMessageCodec from top-level exports in commit 490749a. It now stays in the codecs submodule and should be imported as from compas_eve.codecs import JsonMessageCodec. The import in core.py is now lazy to avoid unnecessary top-level dependencies.

- Removed JsonMessageCodec from compas_eve.__init__ exports - Moved import back to lazy import in Transport.__init__ to avoid top-level dependency - JsonMessageCodec should be imported as `from compas_eve.codecs import JsonMessageCodec` - This keeps the API cleaner and more organized Co-authored-by: gonzalocasas <[email protected]>

gonzalocasas · 2025-10-15T16:08:54Z

examples/codec_usage.py

+import json
+
+import compas_eve as eve
+from compas_eve import JsonMessageCodec, MessageCodec


@copilot fix this import

Fixed import in commit [pending]. Now uses from compas_eve.codecs import JsonMessageCodec instead of importing from top-level.

Fixed import in commit f5ca830. Now uses from compas_eve.codecs import JsonMessageCodec instead of importing from top-level.

- Updated import to use `from compas_eve.codecs import JsonMessageCodec` - This reflects the change where JsonMessageCodec is no longer exported at top level Co-authored-by: gonzalocasas <[email protected]>

chenkasirer

LGTM!

:P

Initial plan

7b2b8d9

Copilot AI assigned Copilot and gonzalocasas Oct 13, 2025

Copilot started work on behalf of gonzalocasas October 13, 2025 14:50 View session

Copilot AI and others added 5 commits October 13, 2025 15:03

Remove IronPython support and add codec infrastructure

71bceb6

Co-authored-by: gonzalocasas <[email protected]>

Update docstrings and validate codec functionality

8023cdf

Co-authored-by: gonzalocasas <[email protected]>

Remove old JSON methods from Topic class

b0b5bd5

Co-authored-by: gonzalocasas <[email protected]>

Update documentation and remove IronPython references

fa73e2e

Co-authored-by: gonzalocasas <[email protected]>

Add codec usage example and fix imports

c648c88

Co-authored-by: gonzalocasas <[email protected]>

Copilot AI changed the title ~~[WIP] Add support for compas_pb serialization in compas_eve~~ Add extensible codec system with Protocol Buffers support and remove IronPython Oct 13, 2025

Copilot AI requested a review from gonzalocasas October 13, 2025 15:18

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Fix linting errors and remove IronPython CI workflow

60f32ed

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Fix remaining lint and style issues

b8fc0dd

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Fix import in codec_usage.py example

f5ca830

- Updated import to use `from compas_eve.codecs import JsonMessageCodec` - This reflects the change where JsonMessageCodec is no longer exported at top level Co-authored-by: gonzalocasas <[email protected]>

Copilot AI requested a review from gonzalocasas October 15, 2025 16:12

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gonzalocasas added 2 commits October 30, 2025 11:23

pb stuff

07c6a1c

update dev reqs

2e1ab0a

gonzalocasas marked this pull request as ready for review October 30, 2025 10:31

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lint

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doc automodule missing

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gonzalocasas merged commit 962ef54 into main Oct 30, 2025
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gonzalocasas deleted the copilot/add-protobuf-support branch October 30, 2025 11:02

gonzalocasas mentioned this pull request Nov 11, 2025

Binary Serialization Integration #16

Closed

10 tasks

		data = topic._message_to_data(message)
		encoded_message = self.codec.encode(data)

		raise NotImplementedError("Subclasses must implement decode()")


		class JsonMessageCodec(MessageCodec):

	self.codec = codec if codec is not None else JsonMessageCodec()
	self.codec = codec or JsonMessageCodec()

	return compas_pb.decode(encoded_data)
	return compas_pb.pb_load_bts(encoded_data)

Add extensible codec system with Protocol Buffers support and remove IronPython #23

Add extensible codec system with Protocol Buffers support and remove IronPython #23

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Summary

✅ Completed Features

📝 Breaking Changes

🔄 Backward Compatibility

📦 Files Changed

✅ Testing

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