If you control the sender and are guaranteed to get some messages exceeding
the websocket limit (which I'm assuming is 4500 bytes) is to either send
multiple smaller updates, or assign some sort of message id and prepend it
to each chunk.
Another option you can do (if you can't control the sender) is have a
string buffer, and each time you get data, if it can't be decoded, append
it to the buffer. After every append, attempt a decode, and if it's
successful, clear the buffer. This will probably break if you get multiple
unrelated messages.
One thing you should keep in mind is websockets on their own aren't really
for messages, it's for streaming data. If you can guarantee synchronous
messages (ie first message must always complete before the second message
starts), you could send a byte length + json (ie "14{ foo: 'bar' }", and do
the buffer method I suggested.
So if you have big messages, your best bet is to chunk them yourself so
you're guaranteeing the size. Otherwise, hope they are synchronous and
assemble them in elm.
On Monday, 10 July 2017 09:12:31 UTC-4, _Boris _ wrote:
>
> Hello,
>
> I have implemented very straightforward converting received packet into
> Msg:
>
> subscriptions : Model -> Sub Msg
> subscriptions model =
> Sub.batch
> [ WebSocket.listen wsServer decoderServerMsg
>
> where decoderServerMsg:
> decoderServerMsg : String -> Msg
> decoderServerMsg rcvdStr = case JD.decodeString jsonDecServerMsg rcvdStr
> of
> Ok serverMsg -> ServerMsgReceived serverMsg
> Err err-> SystemError ("Failed to parser server msg:"++err++"
> string:"++rcvdStr)
>
>
> It works well as long as there is no fragmentation, ie. every packet
> contains valid json payload.
> My problem starts when packet exceeds about 4500 bytes and then it is
> broken into two chunks.
> I believe it very common case so before reinventing the wheel I wanted to
> ask if there is already solution for this problem that I can use?
>
>
> Thanks,
> Boris
>
>
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