113 lines
2.2 KiB
JavaScript
113 lines
2.2 KiB
JavaScript
'use strict';
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var through2 = require('through2');
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var EE = require('events').EventEmitter;
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var fancyLog = require('fancy-log');
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var chalk = require('chalk');
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var PluginError = require('plugin-error');
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function removeDefaultHandler(stream, event) {
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var found = false;
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stream.listeners(event).forEach(function (item) {
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if (item.name === 'on' + event) {
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found = item;
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this.removeListener(event, item);
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}
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}, stream);
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return found;
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}
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function wrapPanicOnErrorHandler(stream) {
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var oldHandler = removeDefaultHandler(stream, 'error');
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if (oldHandler) {
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stream.on('error', function onerror2(er) {
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if (EE.listenerCount(stream, 'error') === 1) {
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this.removeListener('error', onerror2);
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oldHandler.call(stream, er);
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}
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});
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}
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}
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function defaultErrorHandler(error) {
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// onerror2 and this handler
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if (EE.listenerCount(this, 'error') < 3) {
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fancyLog(
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chalk.cyan('Plumber') + chalk.red(' found unhandled error:\n'),
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error.toString()
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);
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}
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}
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function plumber(opts) {
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opts = opts || {};
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if (typeof opts === 'function') {
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opts = {errorHandler: opts};
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}
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var through = through2.obj();
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through._plumber = true;
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if (opts.errorHandler !== false) {
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through.errorHandler = (typeof opts.errorHandler === 'function') ?
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opts.errorHandler :
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defaultErrorHandler;
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}
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function patchPipe(stream) {
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if (stream.pipe2) {
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wrapPanicOnErrorHandler(stream);
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stream._pipe = stream._pipe || stream.pipe;
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stream.pipe = stream.pipe2;
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stream._plumbed = true;
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}
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}
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through.pipe2 = function pipe2(dest) {
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if (!dest) {
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throw new PluginError('plumber', 'Can\'t pipe to undefined');
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}
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this._pipe.apply(this, arguments);
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if (dest._unplumbed) {
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return dest;
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}
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removeDefaultHandler(this, 'error');
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if (dest._plumber) {
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return dest;
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}
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dest.pipe2 = pipe2;
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// Patching pipe method
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if (opts.inherit !== false) {
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patchPipe(dest);
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}
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// Placing custom on error handler
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if (this.errorHandler) {
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dest.errorHandler = this.errorHandler;
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dest.on('error', this.errorHandler.bind(dest));
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}
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dest._plumbed = true;
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return dest;
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};
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patchPipe(through);
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return through;
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}
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module.exports = plumber;
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module.exports.stop = function () {
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var through = through2.obj();
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through._unplumbed = true;
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return through;
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};
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