164 lines
2.9 KiB
JavaScript
164 lines
2.9 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var EventEmitter = require('events').EventEmitter
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, debug = require('debug')('runnable');
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/**
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* Expose `Runnable`.
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*/
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module.exports = Runnable;
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/**
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* Initialize a new `Runnable` with the given `title` and callback `fn`.
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*
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* @param {String} title
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* @param {Function} fn
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* @api private
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*/
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function Runnable(title, fn) {
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this.title = title;
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this.fn = fn;
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this.async = fn && fn.length;
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this.sync = ! this.async;
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this._timeout = 2000;
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this.timedOut = false;
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this.context = this;
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}
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/**
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* Inherit from `EventEmitter.prototype`.
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*/
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Runnable.prototype.__proto__ = EventEmitter.prototype;
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/**
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* Set & get timeout `ms`.
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*
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* @param {Number} ms
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* @return {Runnable|Number} ms or self
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* @api private
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*/
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Runnable.prototype.timeout = function(ms){
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if (0 == arguments.length) return this._timeout;
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debug('timeout %d', ms);
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this._timeout = ms;
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if (this.timer) this.resetTimeout();
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return this;
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};
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/**
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* Return the full title generated by recursively
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* concatenating the parent's full title.
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*
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* @return {String}
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* @api public
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*/
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Runnable.prototype.fullTitle = function(){
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return this.parent.fullTitle() + ' ' + this.title;
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};
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/**
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* Clear the timeout.
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*
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* @api private
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*/
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Runnable.prototype.clearTimeout = function(){
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clearTimeout(this.timer);
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};
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/**
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* Reset the timeout.
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*
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* @api private
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*/
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Runnable.prototype.resetTimeout = function(){
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var self = this
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, ms = this.timeout();
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this.clearTimeout();
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if (ms) {
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this.timer = setTimeout(function(){
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self.callback(new Error('timeout of ' + ms + 'ms exceeded'));
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self.timedOut = true;
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}, ms);
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}
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};
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/**
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* Run the test and invoke `fn(err)`.
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*
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* @param {Function} fn
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* @api private
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*/
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Runnable.prototype.run = function(fn){
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var self = this
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, ms = this.timeout()
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, start = new Date
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, ctx = this.context
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, finished
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, emitted;
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// timeout
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if (this.async) {
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if (ms) {
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this.timer = setTimeout(function(){
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done(new Error('timeout of ' + ms + 'ms exceeded'));
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self.timedOut = true;
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}, ms);
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}
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}
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// called multiple times
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function multiple() {
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if (emitted) return;
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emitted = true;
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self.emit('error', new Error('done() called multiple times'));
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}
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// finished
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function done(err) {
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if (self.timedOut) return;
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if (finished) return multiple();
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self.clearTimeout();
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self.duration = new Date - start;
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finished = true;
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fn(err);
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}
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// for .resetTimeout()
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this.callback = done;
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// async
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if (this.async) {
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try {
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this.fn.call(ctx, function(err){
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if (err instanceof Error) return done(err);
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if (null != err) return done(new Error('done() invoked with non-Error: ' + err));
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done();
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});
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} catch (err) {
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done(err);
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}
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return;
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}
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// sync
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try {
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if (!this.pending) this.fn.call(ctx);
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this.duration = new Date - start;
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fn();
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} catch (err) {
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fn(err);
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}
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};
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