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2013-12-14T16:36:34.100
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Here's my take on your issue. The basic idea is to create a <code>Transform</code> stream, which will allow us to execute your custom buffering logic before sending the data on the output of the stream: <pre><code>var util = require('util') var stream = require('stream') var BufferStream = function (streamOptions) { stream.Transform.call(this, streamOptions) this.buffer = new Buffer('') } util.inherits(BufferStream, stream.Transform) BufferStream.prototype._transform = function (chunk, encoding, done) { // custom buffering logic // ie. add chunk to this.buffer, check buffer size, etc. this.buffer = new Buffer(chunk) this.push(chunk) done() } </code></pre> Then, we need to override the <code>.pipe()</code> method so that we are are notified when the <code>BufferStream</code> is piped into a stream, which allows us to automatically write data to it: <pre><code>BufferStream.prototype.pipe = function (destination, options) { var res = BufferStream.super_.prototype.pipe.call(this, destination, options) res.write(this.buffer) return res } </code></pre> In this way, when we write <code>buffer.pipe(someStream)</code>, we perform the pipe as intended and write the internal buffer to the output stream. After that, the <code>Transform</code> class takes care of everything, while keeping track of the backpressure and whatnot. Here is a <a href="https://gist.github.com/PaulMougel/7961469" rel="noreferrer">working gist</a>. Please note that I didn't bother writing a correct buffering logic (ie. I don't care about the size of the internal buffer), but this should be easy to fix.
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