stream-flow-control
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Stream Flow Control
665 lines (650 loc) • 28.8 kB
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<title>Code coverage report for lib/goals/goals.js</title>
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<h1><a href="../../index.html">All files</a> / <a href="index.html">lib/goals</a> goals.js</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">90.82% </span>
<span class="quiet">Statements</span>
<span class='fraction'>89/98</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">74.14% </span>
<span class="quiet">Branches</span>
<span class='fraction'>43/58</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>25/25</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">97.62% </span>
<span class="quiet">Lines</span>
<span class='fraction'>82/84</span>
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<p class="quiet">
Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
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<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
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<a name='L110'></a><a href='#L110'>110</a>
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<a name='L112'></a><a href='#L112'>112</a>
<a name='L113'></a><a href='#L113'>113</a>
<a name='L114'></a><a href='#L114'>114</a>
<a name='L115'></a><a href='#L115'>115</a>
<a name='L116'></a><a href='#L116'>116</a>
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<a name='L118'></a><a href='#L118'>118</a>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const {Writable, Readable} = require('stream');
const {Manager} = require('../manager/manager.js');
const {DataWrapper} = require('../wrapper/data_wrapper.js');
const vm = require('vm');
/**
* Goal wrapps many streams within, hidding complex business logic. Represents a goal to achieve.
*
* @extends Writable
*/
class Goal extends Writable {
/**
* Create a Goal stream
* @param {object} [options] Global options
* @param {string} [options.name] Name for this stream
*/
constructor(options, cb) {
options = {...options, objectMode: true};
super(options);
this.options = options;
this.type = 'Goal';
<span class="missing-if-branch" title="if path not taken" >I</span>if(this.options.name) <span class="cstat-no" title="statement not covered" >Manager.set(this.type, this);</span>
const self = this;
this._start = new Readable({
objectMode: true,
read() {
self.uncork();
}
});
this._start.options = {...this._start.options||{}, name: this.options.name, port: 'start'};
this._start._readableState.sync = false;
this.on('prefinish', ()=>{
this._start.push(null);
})
this._error_reader = new Readable({
objectMode: true,
read() {}
});
this._error_reader.options = {...this._error_reader.options||{}, name: this.options.name, port: 'error'};
this._error_reader._readableState.sync = false;
this._resolve_reader = null;
this._reject_reader = null;
this._resolve_writer =new Writable({
objectMode: true,
write: (payload, encoding, cb) => {
let data = payload instanceof DataWrapper?payload.data:<span class="branch-1 cbranch-no" title="branch not covered" >payload;</span>
if(self._cb) self._cb(null, data);
if(self._resolve_reader) {
//process.nextTick(()=>self._resolve_reader.push(data));
let goOn = self._resolve_reader.push(data);
<span class="missing-if-branch" title="if path not taken" >I</span>if(!self._resolve_writer.corked && !goOn) <span class="cstat-no" title="statement not covered" >self._resolve_writer.cork();</span>
}
self.emit('resolve', data);
cb();
}
});
this._resolve_writer.on('prefinish', ()=>{
if(this._resolve_reader) this._resolve_reader.push(null);
});
this._reject_writer = new Writable({
objectMode: true,
write: (payload, encoding, cb) => {
// TODO - save payload for statistics
let data = payload instanceof DataWrapper?payload.data:payload;
if(self._cb) self._cb(data);
if(self._reject_reader) {
//process.nextTick(()=>self._resolve_reader.push(data));
let goOn = self._reject_reader.push(data);
<span class="missing-if-branch" title="if path not taken" >I</span>if(!self._reject_writer.corked && !goOn) <span class="cstat-no" title="statement not covered" >self._reject_writer.cork();</span>
}
self.emit('reject', data);
cb();
}
});
this._reject_writer.on('prefinish', ()=>{
if(this._reject_reader) this._reject_reader.push(null);
});
this._error_reader.pipe(this._reject_writer);
this._cb = cb;
this.on('pipe', src => {
this._src = src;
})
}
/**
* Pipe to a destination stream when goal was achieved
* @param {Writable} dst
*/
resolve(dst) {
<span class="missing-if-branch" title="else path not taken" >E</span>if(!this._resolve_reader) {
const self = this;
this._resolve_reader = new Readable({
objectMode: true,
read() {
<span class="missing-if-branch" title="else path not taken" >E</span>if(self._resolve_writer) self._resolve_writer.uncork()
}
});
this._resolve_reader.options = {...this._resolve_reader.options||{}, name: this.options.name, port: 'resolve'};
this._resolve_reader._readableState.sync = false;
}
const pipes = Array.isArray(dst)?<span class="branch-0 cbranch-no" title="branch not covered" >dst:</span>[dst];
pipes.forEach(dst=>this._resolve_reader.pipe(dst));
return Array.isArray(dst)?<span class="branch-0 cbranch-no" title="branch not covered" >this:</span>dst;
}
/**
* Register a node style callback, called when goal is resolved or rejected
* @param {NodeCallback} cb
*/
callback(cb) {
this._cb = cb;
return this;
}
_registerChild(src) {
src.on('error', (error)=>{
this._error_reader.push(error);
})
}
/**
* Pipe to a destination stream when goal was not achieved
* @param {Writable} dst
*/
reject(dst) {
<span class="missing-if-branch" title="else path not taken" >E</span>if(!this._reject_reader) {
this._reject_reader = new Readable({
objectMode: true,
read() {
<span class="missing-if-branch" title="if path not taken" >I</span>if(self._reject_writer) <span class="cstat-no" title="statement not covered" >self._reject_writer.uncork()</span>
}
});
this._reject_reader.options = {...this._reject_reader.options||{}, name: this.options.name, port: 'reject'};
this._reject_reader._readableState.sync = false;
}
const pipes = Array.isArray(dst)?<span class="branch-0 cbranch-no" title="branch not covered" >dst:</span>[dst];
pipes.forEach(dst=>this._reject_reader.pipe(dst));
return Array.isArray(dst)?<span class="branch-0 cbranch-no" title="branch not covered" >this:</span>dst;
}
/**
* Thenable function to work with promises.
* @param {ThenCallback} thenCallback called when goal is achieved
* @param {CatchCallback} [catchCallback] called when goal is not achieved
* @returns {Promise}
*/
then(rescb, rejcb) {
return new Promise((resolve, reject) => {
this.on('resolve', data => {
<span class="missing-if-branch" title="if path not taken" >I</span>if(!rescb) <span class="cstat-no" title="statement not covered" >return resolve(data);</span>
try {
resolve(rescb(data));
} catch(e) {
<span class="cstat-no" title="statement not covered" > reject(e);</span>
}
});
this.on('reject', data => {
<span class="missing-if-branch" title="if path not taken" >I</span>if(!rejcb) <span class="cstat-no" title="statement not covered" >return reject(data);</span>
try {
resolve(rejcb(data));
} catch(e) {
<span class="cstat-no" title="statement not covered" > reject(e);</span>
}
})
});
}
/**
* Thenable function to work with promises.
* @param {CatchCallback} catchCallback called when goal is not achieved
* @returns {Promise}
*/
catch(rejcb) {
return this.then(null, rejcb);
}
build(chain, options) {
Manager._build(chain, {...options, goal: this});
}
_write(payload, encoding, cb) {
var data = new DataWrapper(payload, this);
//process.nextTick(()=>this._start.push(data));
let goOn = this._start.push(data);
<span class="missing-if-branch" title="if path not taken" >I</span>if(!this._writableState.corked && !goOn) <span class="cstat-no" title="statement not covered" >this.cork();</span>
cb();
}
}
module.exports.Goal = Goal;
// module.exports.GoalGroup = GoalGroup;</pre></td></tr></table></pre>
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