75 lines
1.9 KiB
JavaScript
75 lines
1.9 KiB
JavaScript
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"use strict";
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var utils = require("../utils");
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var GenericWorker = require("../stream/GenericWorker");
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/**
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* A worker that use a nodejs stream as source.
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* @constructor
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* @param {String} filename the name of the file entry for this stream.
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* @param {Readable} stream the nodejs stream.
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*/
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function NodejsStreamInputAdapter(filename, stream) {
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GenericWorker.call(this, "Nodejs stream input adapter for " + filename);
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this._upstreamEnded = false;
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this._bindStream(stream);
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}
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utils.inherits(NodejsStreamInputAdapter, GenericWorker);
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/**
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* Prepare the stream and bind the callbacks on it.
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* Do this ASAP on node 0.10 ! A lazy binding doesn't always work.
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* @param {Stream} stream the nodejs stream to use.
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*/
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NodejsStreamInputAdapter.prototype._bindStream = function (stream) {
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var self = this;
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this._stream = stream;
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stream.pause();
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stream
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.on("data", function (chunk) {
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self.push({
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data: chunk,
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meta : {
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percent : 0
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}
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});
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})
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.on("error", function (e) {
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if(self.isPaused) {
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this.generatedError = e;
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} else {
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self.error(e);
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}
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})
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.on("end", function () {
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if(self.isPaused) {
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self._upstreamEnded = true;
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} else {
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self.end();
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}
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});
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};
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NodejsStreamInputAdapter.prototype.pause = function () {
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if(!GenericWorker.prototype.pause.call(this)) {
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return false;
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}
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this._stream.pause();
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return true;
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};
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NodejsStreamInputAdapter.prototype.resume = function () {
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if(!GenericWorker.prototype.resume.call(this)) {
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return false;
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}
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if(this._upstreamEnded) {
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this.end();
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} else {
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this._stream.resume();
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}
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return true;
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};
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module.exports = NodejsStreamInputAdapter;
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