stream-flow-control
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Stream Flow Control
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<title>Code coverage report for lib/rules/rules.js</title>
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<h1><a href="../../index.html">All files</a> / <a href="index.html">lib/rules</a> rules.js</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">4.04% </span>
<span class="quiet">Statements</span>
<span class='fraction'>4/99</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Branches</span>
<span class='fraction'>0/80</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Functions</span>
<span class='fraction'>0/15</span>
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<div class='fl pad1y space-right2'>
<span class="strong">4.4% </span>
<span class="quiet">Lines</span>
<span class='fraction'>4/91</span>
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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>
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<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>
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<a name='L15'></a><a href='#L15'>15</a>
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<a name='L85'></a><a href='#L85'>85</a>
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<a name='L108'></a><a href='#L108'>108</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>
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<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-yes">9x</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');
/**
* A rule represents a piece of business logic. Streams can be chained by an arbitrary event name, or by resolve/reject functions.
* @extends Writable
*/
class Rule extends Writable {
/**
* Create a Rule stream
* @param {object} [options] Global options
* @param {string} [options.name] Name for this stream
* @param {RuleProcess} options.rule Method that defines the rule logic.
*
* If inside the rule you emit an event with data, it will be sent to streams attached to the corresponding event on chain method.
*
* If this function returns exactly _true_, incoming payload will be sent to streams attached in _resolve_ function.
*
* If this function returns exactly _false_, incoming payload will be sent to streams attached in _reject_ function.
*
* If this function returns _undefined_, no message will be sent to either streams attached to _resolve_ or _reject_.
*
* If anything else is returned, or an exception is thrown, that will be sent to streams attached in _reject_ function.
*/
<span class="fstat-no" title="function not covered" > co</span>nstructor(options) {
<span class="cstat-no" title="statement not covered" > options = {...options, objectMode: true};</span>
<span class="cstat-no" title="statement not covered" > super(options);</span>
<span class="cstat-no" title="statement not covered" > this.options = options;</span>
<span class="cstat-no" title="statement not covered" > if(this.options.rule && typeof this.options.rule == 'function') <span class="cstat-no" title="statement not covered" >this._rule = this.options.rule;</span></span>
<span class="cstat-no" title="statement not covered" > this._chains = {};</span>
<span class="cstat-no" title="statement not covered" > this._resolve_reader = null;</span>
<span class="cstat-no" title="statement not covered" > this._reject_reader = null;</span>
<span class="cstat-no" title="statement not covered" > this._corking_readers = {};</span>
<span class="cstat-no" title="statement not covered" > this.type = 'Rule';</span>
<span class="cstat-no" title="statement not covered" > this._needsEnd = false;</span>
<span class="cstat-no" title="statement not covered" > if(this.options.name) <span class="cstat-no" title="statement not covered" >Manager.set(this.type, this);</span></span>
}
/**
* Register streams to pipe to when _event_ is fired.
* @param {string} event event name.
* @param {Writable} dst stream to pipe to.
*/
<span class="fstat-no" title="function not covered" > ch</span>ain(event, dst) {
<span class="cstat-no" title="statement not covered" > if(!this._chains[event+""]) {</span>
const self = <span class="cstat-no" title="statement not covered" >this;</span>
<span class="cstat-no" title="statement not covered" > this._chains[event+""] = new Readable({</span>
objectMode: true,
<span class="fstat-no" title="function not covered" > re</span>ad() {
<span class="cstat-no" title="statement not covered" > if(self._corking_readers[event+""]) {</span>
<span class="cstat-no" title="statement not covered" > self.uncork();</span>
<span class="cstat-no" title="statement not covered" > delete self._corking_readers[event+""];</span>
}
}
});
<span class="cstat-no" title="statement not covered" > this._chains[event+""].options = {...this._chains[event+""].options||{}, name: this.options.name, port: event};</span>
<span class="cstat-no" title="statement not covered" > this._chains[event+""]._readableState.sync = false;</span>
<span class="cstat-no" title="statement not covered" > this.on(event+"", <span class="fstat-no" title="function not covered" >(d</span>ata) => {</span>
let goOn = <span class="cstat-no" title="statement not covered" >this._chains[event+""].push(data);</span>
<span class="cstat-no" title="statement not covered" > if(!goOn && !self._corking_readers[event+""]) {</span>
<span class="cstat-no" title="statement not covered" > this.cork();</span>
<span class="cstat-no" title="statement not covered" > self._corking_readers[event+""] = true;</span>
}
});
<span class="cstat-no" title="statement not covered" > this._chains[event+""].on('resume', <span class="fstat-no" title="function not covered" >()</span>=><span class="cstat-no" title="statement not covered" >this.uncork())</span>;</span>
}
const pipes = <span class="cstat-no" title="statement not covered" >Array.isArray(dst)?dst:[dst];</span>
<span class="cstat-no" title="statement not covered" > pipes.forEach(<span class="fstat-no" title="function not covered" >ds</span>t=>{</span>
<span class="cstat-no" title="statement not covered" > this._chains[event+""].pipe(dst);</span>
<span class="cstat-no" title="statement not covered" > dst.emit && dst.emit('chained', {event, src: this});</span>
});
<span class="cstat-no" title="statement not covered" > return Array.isArray(dst)?this:dst;</span>
}
/**
* Register streams to pipe to when _options.rule_ returns _true_
* @param {Writable} dst stream to pipe to
*/
<span class="fstat-no" title="function not covered" > re</span>solve(dst) {
<span class="cstat-no" title="statement not covered" > if(!this._resolve_reader) {</span>
const self = <span class="cstat-no" title="statement not covered" >this;</span>
<span class="cstat-no" title="statement not covered" > this._resolve_reader = new Readable({</span>
objectMode: true,
<span class="fstat-no" title="function not covered" > re</span>ad() {
<span class="cstat-no" title="statement not covered" > if(self._corking_readers["resolve"]) {</span>
<span class="cstat-no" title="statement not covered" > self.uncork();</span>
<span class="cstat-no" title="statement not covered" > delete self._corking_readers["resolve"];</span>
}
}
});
<span class="cstat-no" title="statement not covered" > this._resolve_reader.options = {...this._resolve_reader.options||{}, name: this.options.name, port: 'resolve'};</span>
<span class="cstat-no" title="statement not covered" > this._resolve_reader._readableState.sync = false;</span>
}
const pipes = <span class="cstat-no" title="statement not covered" >Array.isArray(dst)?dst:[dst];</span>
<span class="cstat-no" title="statement not covered" > pipes.forEach(<span class="fstat-no" title="function not covered" >ds</span>t=><span class="cstat-no" title="statement not covered" >this._resolve_reader.pipe(dst))</span>;</span>
<span class="cstat-no" title="statement not covered" > return Array.isArray(dst)?this:dst;</span>
}
/**
* Register streams to pipe to when _options.rule_ returns anything else __but__ _true_, or when an exception is thrown.
* @param {Writable} dst stream to pipe to
*/
<span class="fstat-no" title="function not covered" > re</span>ject(dst) {
<span class="cstat-no" title="statement not covered" > if(!this._reject_reader) {</span>
const self = <span class="cstat-no" title="statement not covered" >this;</span>
<span class="cstat-no" title="statement not covered" > this._reject_reader = new Readable({</span>
objectMode: true,
<span class="fstat-no" title="function not covered" > re</span>ad() {
<span class="cstat-no" title="statement not covered" > if(self._corking_readers["reject"]) {</span>
<span class="cstat-no" title="statement not covered" > self.uncork();</span>
<span class="cstat-no" title="statement not covered" > delete self._corking_readers["reject"];</span>
}
}
});
<span class="cstat-no" title="statement not covered" > this._reject_reader.options = {...this._reject_reader.options||{}, name: this.options.name, port: 'reject'};</span>
<span class="cstat-no" title="statement not covered" > this._reject_reader._readableState.sync = false;</span>
}
const pipes = <span class="cstat-no" title="statement not covered" >Array.isArray(dst)?dst:[dst];</span>
<span class="cstat-no" title="statement not covered" > pipes.forEach(<span class="fstat-no" title="function not covered" >ds</span>t=><span class="cstat-no" title="statement not covered" >this._reject_reader.pipe(dst))</span>;</span>
<span class="cstat-no" title="statement not covered" > return Array.isArray(dst)?this:dst;</span>
}
<span class="fstat-no" title="function not covered" > _r</span>ule(data) {
<span class="cstat-no" title="statement not covered" > throw 'METHOD NOT IMPLEMENTED _rule()';</span>
}
<span class="fstat-no" title="function not covered" > _w</span>rite(payload, encoding, cb) {
<span class="cstat-no" title="statement not covered" > try {<span class="cstat-no" title="statement not covered" >throw "a";}</span> catch(e) {}</span>
var result;
<span class="cstat-no" title="statement not covered" > if(this.goal) {</span>
<span class="cstat-no" title="statement not covered" > payload = payload.getChild(this);</span>
}
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > this._rulling = true;</span>
<span class="cstat-no" title="statement not covered" > result = this._rule(payload);</span>
<span class="cstat-no" title="statement not covered" > this._rulling = false;</span>
<span class="cstat-no" title="statement not covered" > if(this._needsEnd) {</span>
<span class="cstat-no" title="statement not covered" > for(let i in this._chains) {</span>
<span class="cstat-no" title="statement not covered" > this._chains[i].push(null);</span>
}
<span class="cstat-no" title="statement not covered" > this._reject_reader && this._reject_reader.push(null);</span>
<span class="cstat-no" title="statement not covered" > this._resolve_reader && this._resolve_reader.push(null);</span>
}
} catch(e) {
<span class="cstat-no" title="statement not covered" > result = e;</span>
}
<span class="cstat-no" title="statement not covered" > if(result !== undefined) {</span>
<span class="cstat-no" title="statement not covered" > if(this._resolve_reader && result === true) {</span>
let goOn = <span class="cstat-no" title="statement not covered" >this._resolve_reader.push(payload);</span>
<span class="cstat-no" title="statement not covered" > if(!goOn && !this._corking_readers['resolve']) {</span>
<span class="cstat-no" title="statement not covered" > this.cork();</span>
<span class="cstat-no" title="statement not covered" > this._corking_readers['resolve']=true;</span>
}
}
<span class="cstat-no" title="statement not covered" > if(result !== true && this._reject_reader) {</span>
<span class="cstat-no" title="statement not covered" > payload = result===false?payload:result;</span>
<span class="cstat-no" title="statement not covered" > if(!payload instanceof DataWrapper && this.goal) <span class="cstat-no" title="statement not covered" >payload = new DataWrapper(payload, this); </span></span>
let goOn = <span class="cstat-no" title="statement not covered" >this._reject_reader.push(payload);</span>
<span class="cstat-no" title="statement not covered" > if(!goOn && !this._corking_readers['reject']) {</span>
<span class="cstat-no" title="statement not covered" > this.cork();</span>
<span class="cstat-no" title="statement not covered" > this._corking_readers['reject']=true;</span>
}
}
}
<span class="cstat-no" title="statement not covered" > cb();</span>
}
<span class="fstat-no" title="function not covered" > en</span>d() {
<span class="cstat-no" title="statement not covered" > try {<span class="cstat-no" title="statement not covered" >throw "a";}</span> catch(e) {}</span>
<span class="cstat-no" title="statement not covered" > if(this._rulling) {</span>
<span class="cstat-no" title="statement not covered" > this._needsEnd = true;</span>
} else {
<span class="cstat-no" title="statement not covered" > for(let i in this._chains) {</span>
<span class="cstat-no" title="statement not covered" > this._chains[i].push(null);</span>
}
<span class="cstat-no" title="statement not covered" > this._reject_reader && this._reject_reader.push(null);</span>
<span class="cstat-no" title="statement not covered" > this._resolve_reader && this._resolve_reader.push(null);</span>
}
}
}
module.exports.Rule = Rule;</pre></td></tr></table></pre>
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