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streams: introduce StreamWrap and JSStream
Introduce a way to wrap plain-js `stream.Duplex` streams into C++ StreamBase's child class. With such method at hand it is now possible to pass `stream.Duplex` instance as a `socket` parameter to `tls.connect()`. PR-URL: #926 Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| const util = require('util'); | ||
| const Socket = require('net').Socket; | ||
| const JSStream = process.binding('js_stream').JSStream; | ||
| const uv = process.binding('uv'); | ||
|
|
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| function StreamWrap(stream) { | ||
| var handle = new JSStream(); | ||
|
|
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| this.stream = stream; | ||
|
|
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| var self = this; | ||
| handle.close = function(cb) { | ||
| cb(); | ||
| }; | ||
| handle.isAlive = function() { | ||
| return self.isAlive(); | ||
| }; | ||
| handle.isClosing = function() { | ||
| return self.isClosing(); | ||
| }; | ||
| handle.onreadstart = function() { | ||
| return self.readStart(); | ||
| }; | ||
| handle.onreadstop = function() { | ||
| return self.readStop(); | ||
| }; | ||
| handle.onshutdown = function(req) { | ||
| return self.shutdown(req); | ||
| }; | ||
| handle.onwrite = function(req, bufs) { | ||
| return self.write(req, bufs); | ||
| }; | ||
|
|
||
| this.stream.pause(); | ||
| this.stream.on('data', function(chunk) { | ||
| self._handle.readBuffer(chunk); | ||
| }); | ||
| this.stream.once('end', function() { | ||
| self._handle.emitEOF(); | ||
| }); | ||
| this.stream.on('error', function(err) { | ||
| self.emit('error', err); | ||
| }); | ||
|
|
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| Socket.call(this, { | ||
| handle: handle | ||
| }); | ||
| } | ||
| util.inherits(StreamWrap, Socket); | ||
| module.exports = StreamWrap; | ||
|
|
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| // require('_stream_wrap').StreamWrap | ||
| StreamWrap.StreamWrap = StreamWrap; | ||
|
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| StreamWrap.prototype.isAlive = function isAlive() { | ||
| return this.readable && this.writable; | ||
| }; | ||
|
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| StreamWrap.prototype.isClosing = function isClosing() { | ||
| return !this.isAlive(); | ||
| }; | ||
|
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| StreamWrap.prototype.readStart = function readStart() { | ||
| this.stream.resume(); | ||
| return 0; | ||
| }; | ||
|
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| StreamWrap.prototype.readStop = function readStop() { | ||
| this.stream.pause(); | ||
| return 0; | ||
| }; | ||
|
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| StreamWrap.prototype.shutdown = function shutdown(req) { | ||
| var self = this; | ||
|
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||
| this.stream.end(function() { | ||
| // Ensure that write was dispatched | ||
| setImmediate(function() { | ||
| self._handle.finishShutdown(req, 0); | ||
| }); | ||
| }); | ||
| return 0; | ||
| }; | ||
|
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| StreamWrap.prototype.write = function write(req, bufs) { | ||
| var pending = bufs.length; | ||
| var self = this; | ||
|
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| self.stream.cork(); | ||
| bufs.forEach(function(buf) { | ||
| self.stream.write(buf, done); | ||
| }); | ||
| self.stream.uncork(); | ||
|
|
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| function done(err) { | ||
| if (!err && --pending !== 0) | ||
| return; | ||
|
|
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| // Ensure that this is called once in case of error | ||
| pending = 0; | ||
|
|
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| // Ensure that write was dispatched | ||
| setImmediate(function() { | ||
| var errCode = 0; | ||
| if (err) { | ||
| if (err.code && uv['UV_' + err.code]) | ||
| errCode = uv['UV_' + err.code]; | ||
| else | ||
| errCode = uv.UV_EPIPE; | ||
| } | ||
|
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| self._handle.doAfterWrite(req); | ||
| self._handle.finishWrite(req, errCode); | ||
| }); | ||
| } | ||
|
|
||
| return 0; | ||
| }; |
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