[erlang-questions] Help Using Bullet + BERT

Loïc Hoguin essen@REDACTED
Mon Jul 1 12:57:03 CEST 2013

Note that bullet only supports text data right now which must be valid 
UTF-8 with some transports like Websocket. So what I'm guessing happens 
is that the browser encodes your binary to be valid UTF-8 and messes 
things up. To use binary data with bullet you need to base64 encode it 
or something similar.

On 07/01/2013 09:03 AM, Kolo Rahl wrote:
> I've been messing around with Bullet and Cowboy recently and am loving
> how easy it is to perform websocket handling. But then I tried
> integrating a BERT JavaScript library with it (the one from 5HT/n2o) and
> noticed that the messages hitting my server are in a form that can't be
> parsed by binary_to_term/1, which is the whole point to to using BERT
> encoding. Even just sending a string or an integer results in an error
> on the server.
> Client/JavaScript:
> bullet.send(Bert.encode("testing"))
> Server/Erlang:
> ** Cowboy handler bullet_handler terminating in websocket_handle/3
>     for the reason error:badarg
> ** Message was {text,<<194,131,107,0,7,116,101,115,116,105,110,103>>}
> [...]
> ** Stacktrace: [{erlang,binary_to_term,
> [<<194,131,107,0,7,116,101,115,116,105,110,103>>],[]},
> [...]
> Calling term_to_binary/1 using "testing" returns
> <<131,107,0,7,116,101,115,116,105,110,103>>, so I can only imagine it's
> that "194" part at the head of the binary object that's the problem, but
> I don't know why it's there and whether that's a result of the internals
> of the client or of the server. Any help?
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Loïc Hoguin
Erlang Cowboy
Nine Nines

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