[undertow-dev] Read request body in HttpHandler

[Stuart Douglas]

RequestBufferingHandler is a performance enhancing handler that is designed to be used for blocking requests, basically
it allows you to fully read the request before the request gets dispatched to a (potentially limited) thread pool.

If you want to read the full body in a non blocking manner the easiest way is to just use the following, it will read the full request into a buffer and then invoke the provided callback:

HttpServerExchange.getRequestReceiver().receiveFullBytes((exchange, data) -> {
  //do stuff with the data
}, 
(exchange, exception) -> {
  //optional error handler
}
)



Stuart

----- Original Message -----
> From: "Friso van Vollenhoven" <f.van.vollenhoven at gmail.com>
> To: undertow-dev at lists.jboss.org
> Sent: Thursday, 11 February, 2016 11:12:11 PM
> Subject: [undertow-dev] Read request body in HttpHandler
> 
> Hi all,
> 
> I'm not sure if this is the right channel to go for help, but there seems to
> be no separate user list, so I'll take a shot here.
> 
> I need to create a HttpHandler that fully reads the request body and stores
> it into a buffer or byte[] before ending the exchange. For this, I'm trying
> to digest what Undertow's RequestBufferingHandler does.
> 
> It seems that I have to take care of the scenario where the handler is called
> before the entire request body is available on the stream by doing the
> following:
> - read from the stream
> - check whether I've hit the end of the stream when as many bytes as possible
> have been read
> - if not, register a listener on the stream and continue handling the request
> from there
> - if so, handle the request from the handler directly
> - finally close the stream
> 
> Can someone assert that the above is correct?
> 
> Also, are there general pointers to what I'd like to achieve (read the
> request body into a buffer)?
> 
> 
> Many thanks, cheers,
> Friso
> 
> 
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