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43 lines
1.0 KiB
43 lines
1.0 KiB
4 years ago
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'use strict';
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var Readable = require('readable-stream').Readable;
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var utils = require('../utils');
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utils.inherits(NodejsStreamOutputAdapter, Readable);
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/**
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* A nodejs stream using a worker as source.
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* @see the SourceWrapper in http://nodejs.org/api/stream.html
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* @constructor
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* @param {StreamHelper} helper the helper wrapping the worker
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* @param {Object} options the nodejs stream options
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* @param {Function} updateCb the update callback.
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*/
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function NodejsStreamOutputAdapter(helper, options, updateCb) {
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Readable.call(this, options);
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this._helper = helper;
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var self = this;
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helper.on("data", function (data, meta) {
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if (!self.push(data)) {
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self._helper.pause();
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}
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if(updateCb) {
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updateCb(meta);
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}
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})
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.on("error", function(e) {
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self.emit('error', e);
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})
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.on("end", function () {
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self.push(null);
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});
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}
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NodejsStreamOutputAdapter.prototype._read = function() {
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this._helper.resume();
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};
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module.exports = NodejsStreamOutputAdapter;
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