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✏️ delayed_stream.js
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var Stream = require('stream').Stream; var util = require('util'); module.exports = DelayedStream; function DelayedStream() { this.source = null; this.dataSize = 0; this.maxDataSize = 1024 * 1024; this.pauseStream = true; this._maxDataSizeExceeded = false; this._released = false; this._bufferedEvents = []; } util.inherits(DelayedStream, Stream); DelayedStream.create = function(source, options) { var delayedStream = new this(); options = options || {}; for (var option in options) { delayedStream[option] = options[option]; } delayedStream.source = source; var realEmit = source.emit; source.emit = function() { delayedStream._handleEmit(arguments); return realEmit.apply(source, arguments); }; source.on('error', function() {}); if (delayedStream.pauseStream) { source.pause(); } return delayedStream; }; Object.defineProperty(DelayedStream.prototype, 'readable', { configurable: true, enumerable: true, get: function() { return this.source.readable; } }); DelayedStream.prototype.setEncoding = function() { return this.source.setEncoding.apply(this.source, arguments); }; DelayedStream.prototype.resume = function() { if (!this._released) { this.release(); } this.source.resume(); }; DelayedStream.prototype.pause = function() { this.source.pause(); }; DelayedStream.prototype.release = function() { this._released = true; this._bufferedEvents.forEach(function(args) { this.emit.apply(this, args); }.bind(this)); this._bufferedEvents = []; }; DelayedStream.prototype.pipe = function() { var r = Stream.prototype.pipe.apply(this, arguments); this.resume(); return r; }; DelayedStream.prototype._handleEmit = function(args) { if (this._released) { this.emit.apply(this, args); return; } if (args[0] === 'data') { this.dataSize += args[1].length; this._checkIfMaxDataSizeExceeded(); } this._bufferedEvents.push(args); }; DelayedStream.prototype._checkIfMaxDataSizeExceeded = function() { if (this._maxDataSizeExceeded) { return; } if (this.dataSize <= this.maxDataSize) { return; } this._maxDataSizeExceeded = true; var message = 'DelayedStream#maxDataSize of ' + this.maxDataSize + ' bytes exceeded.' this.emit('error', new Error(message)); };
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