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stream: move legacy to lib/internal dir
Improve readability of lib/stream.js by moving the legacy abstract Stream into lib/internal/streams/legacy.js. PR-URL: #8197 Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,93 @@ | ||
'use strict'; | ||
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const EE = require('events'); | ||
const util = require('util'); | ||
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function Stream() { | ||
EE.call(this); | ||
} | ||
util.inherits(Stream, EE); | ||
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Stream.prototype.pipe = function(dest, options) { | ||
var source = this; | ||
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function ondata(chunk) { | ||
if (dest.writable) { | ||
if (false === dest.write(chunk) && source.pause) { | ||
source.pause(); | ||
} | ||
} | ||
} | ||
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source.on('data', ondata); | ||
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function ondrain() { | ||
if (source.readable && source.resume) { | ||
source.resume(); | ||
} | ||
} | ||
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dest.on('drain', ondrain); | ||
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// If the 'end' option is not supplied, dest.end() will be called when | ||
// source gets the 'end' or 'close' events. Only dest.end() once. | ||
if (!dest._isStdio && (!options || options.end !== false)) { | ||
source.on('end', onend); | ||
source.on('close', onclose); | ||
} | ||
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var didOnEnd = false; | ||
function onend() { | ||
if (didOnEnd) return; | ||
didOnEnd = true; | ||
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dest.end(); | ||
} | ||
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function onclose() { | ||
if (didOnEnd) return; | ||
didOnEnd = true; | ||
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if (typeof dest.destroy === 'function') dest.destroy(); | ||
} | ||
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// don't leave dangling pipes when there are errors. | ||
function onerror(er) { | ||
cleanup(); | ||
if (EE.listenerCount(this, 'error') === 0) { | ||
throw er; // Unhandled stream error in pipe. | ||
} | ||
} | ||
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source.on('error', onerror); | ||
dest.on('error', onerror); | ||
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// remove all the event listeners that were added. | ||
function cleanup() { | ||
source.removeListener('data', ondata); | ||
dest.removeListener('drain', ondrain); | ||
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source.removeListener('end', onend); | ||
source.removeListener('close', onclose); | ||
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source.removeListener('error', onerror); | ||
dest.removeListener('error', onerror); | ||
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source.removeListener('end', cleanup); | ||
source.removeListener('close', cleanup); | ||
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dest.removeListener('close', cleanup); | ||
} | ||
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source.on('end', cleanup); | ||
source.on('close', cleanup); | ||
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dest.on('close', cleanup); | ||
dest.emit('pipe', source); | ||
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// Allow for unix-like usage: A.pipe(B).pipe(C) | ||
return dest; | ||
}; | ||
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module.exports = Stream; |
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