Here's what I have done in the past, if I get an incomplete chunk, I hang
on to it and call done, I have technically consumed it by hanging on to it.
When I get another chunk I check if that completes my partial chunk, if it
does, I do this.push then call done, if I don't I hang to another partial
chunk and call done anyways.
Instead of hanging on to the callback (done), just call it once you've put
your partial chunk on to your _pendingChunks array
On Sunday, 14 April 2013 07:16:18 UTC-4, Mike Pilsbury wrote:
>
> I'm extending Transform, and I'm a little unclear when to
> call transform._transform(chunk, encoding, callback)'s callback.
>
> The documentation says "Call the callback function only when the current
> chunk is completely consumed. Note that there may or may not be output as a
> result of any particular input chunk.". But what does "completely
> consumed" mean?
>
> If I can't use the chunk yet (because I need to wait for more data for a
> full packet, and the packet's length has to be in the packet's header), and
> I keep a reference to the chunk, does that mean that I shouldn't call the
> callback yet? If that's the case, I guess that I need to keep the callback
> associated with each of these chunks.
>
> this._pendingChunks = [];
> ...
> this._pendingChunks.push({chunk: chunk, callback: callback});
>
> Then I can call each chunk's callback (in a latter execution of
> _transform) when I've used it to create and push a complete packet, and
> I've no longer a need to reference the chunk.
>
> Or am I making things more complicated than they need to be?
>
>
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