Autbahn.ws + Google Protobuf

[Gerald Madlmayr]

Hi,

I'd like to use Autobahn.ws in combination with Google Protobufs. Actually I'm a Java Developer and my Server Infrastructure is already up and running with Netty 4.0.0 CR1 + Protobufs 2.5.0.

When using "standard" Messages over the WebSockets Channel everything is fine, but when using Protobufs, I do have an encoding/decoding problem, as I'm using HTTP but Googles Protobufs.

On the Java Server I do have Classes, such as ProtobufVarint32FrameDecoder,  ProtobufDecoder, ProtobufVarint32LengthFieldPrepender and ProtobufEncoder that help me to do the Jobs with Netty. So I was wondering if there a similar thing for Python as well? I'm new to Pyhton so I might have missed something.

Here is the example that works fine in java: https://github.com/netty/netty/blob/master/example/src/main/java/io/netty/example/worldclock/WorldClockServerInitializer.java

Many Thanks in Advance and looking forward to your response

Kind Regards, Gerald

[Tobias Oberstein]

Am 11.05.2013 22:19, schrieb Gerald Madlmayr:
> Hi,
>
> I'd like to use Autobahn.ws in combination with Google Protobufs.

Which? AutobahnPython, AutobahnAndroid, ..?

> Actually I'm a Java Developer and my Server Infrastructure is already up
> and running with Netty 4.0.0 CR1 + Protobufs 2.5.0.
>
> When using "standard" Messages over the WebSockets Channel everything is
> fine, but when using Protobufs, I do have an encoding/decoding problem,
> as I'm using HTTP but Googles Protobufs.
>
> On the Java Server I do have Classes, such as
> ProtobufVarint32FrameDecoder, ProtobufDecoder,
> ProtobufVarint32LengthFieldPrepender and ProtobufEncoder that help me to
> do the Jobs with Netty. So I was wondering if there a similar thing for
> Python as well? I'm new to Pyhton so I might have missed something.

Protobuf's seem to be supported on Python
https://developers.google.com/protocol-buffers/docs/pythontutorial

>
> Here is the example that works fine in java:
> https://github.com/netty/netty/blob/master/example/src/main/java/io/netty/example/worldclock/WorldClockServerInitializer.java
>
> Many Thanks in Advance and looking forward to your response

Honestly, I'm not sure I understand how this is related to Autobahn. Do
you want to write a WebSocket-based client using Protobufs talking to
your Netty server? You want a Python or Android client? If so, then yes,
you can take AutobahnPython or AutobahnAndroid as a basis, use the raw
WebSocket layer those libraries expose, and then layer your Protobuf
stuff on top ..

Apart from that, Autobahn also provides WAMP: http://www.wamp.ws/

Different from Protobufs, the serialization is (deliberately)
schemaless, and WAMP provides RPC and PubSub messaging patterns.

Tobias


>
> Kind Regards, Gerald
>
>
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[Gerald Madlmayr]

Hi Tobias,

thanks for point that out to me. After a nice day with afternoon with Wireshark, I was able to overcome the issue. As you pointed out correctly, I don't need Websockets at all -- pure TCP-Sockets will do. Thus I modified the simpleClient from Twisted (http://twistedmatrix.com/documents/12.2.0/core/examples/simpleclient.py) and added some protobuf Encoding using varint (http://code.google.com/p/spinn3r-client/source/browse/src/python/varint.py) and it does the job. No autobahn.ws this time - but I fixed the issues. Thanks for the support.

best, Gerald

[Tobias Oberstein]

Am 20.05.2013 21:58, schrieb Gerald Madlmayr:
> Hi Tobias,
>
> thanks for point that out to me. After a nice day with afternoon with
> Wireshark, I was able to overcome the issue. As you pointed out
> correctly, I don't need Websockets at all -- pure TCP-Sockets will do.
> Thus I modified the simpleClient from Twisted
> (http://twistedmatrix.com/documents/12.2.0/core/examples/simpleclient.py) and
> added some protobuf Encoding using varint
> (http://code.google.com/p/spinn3r-client/source/browse/src/python/varint.py)
> and it does the job. No autobahn.ws this time - but I fixed the issues.
> Thanks for the support.

Sure, no problem. Should you ever need to support browser clients as
well, we'd be happy to welcome you back to Autobahn;)

Tobias

>
> best, Gerald
>
> Am Samstag, 11. Mai 2013 22:19:41 UTC+2 schrieb Gerald Madlmayr:
>
> Hi,
>
> I'd like to use Autobahn.ws in combination with Google Protobufs.
> Actually I'm a Java Developer and my Server Infrastructure is
> already up and running with Netty 4.0.0 CR1 + Protobufs 2.5.0.
>
> When using "standard" Messages over the WebSockets Channel
> everything is fine, but when using Protobufs, I do have an
> encoding/decoding problem, as I'm using HTTP but Googles Protobufs.
>
> On the Java Server I do have Classes, such as
> ProtobufVarint32FrameDecoder, ProtobufDecoder,
> ProtobufVarint32LengthFieldPrepender and ProtobufEncoder that help
> me to do the Jobs with Netty. So I was wondering if there a similar
> thing for Python as well? I'm new to Pyhton so I might have missed
> something.
>
> Here is the example that works fine in java:
> https://github.com/netty/netty/blob/master/example/src/main/java/io/netty/example/worldclock/WorldClockServerInitializer.java
> <https://github.com/netty/netty/blob/master/example/src/main/java/io/netty/example/worldclock/WorldClockServerInitializer.java>
>
> Many Thanks in Advance and looking forward to your response
>
> Kind Regards, Gerald
>
>