susyweb
Version:
Sophon JavaScript API, middleware to talk to a sophon node over RPC
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<title>Code coverage report for susyweb-providers-ipc/src/index.js</title>
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<a href="../../index.html">All files</a> / <a href="index.html">susyweb-providers-ipc/src</a> index.js
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<div class='fl pad1y space-right2'>
<span class="strong">32.73% </span>
<span class="quiet">Statements</span>
<span class='fraction'>36/110</span>
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<div class='fl pad1y space-right2'>
<span class="strong">7.89% </span>
<span class="quiet">Branches</span>
<span class='fraction'>3/38</span>
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<div class='fl pad1y space-right2'>
<span class="strong">21.74% </span>
<span class="quiet">Functions</span>
<span class='fraction'>5/23</span>
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<div class='fl pad1y space-right2'>
<span class="strong">32.73% </span>
<span class="quiet">Lines</span>
<span class='fraction'>36/110</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/*
This file is part of susyweb.js.
susyweb.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
susyweb.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MSRCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with susyweb.js. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file index.js
* @authors:
* Fabian Vogelsteller <fabian@ethereum.org>
* @date 2017
*/
"use strict";
var _ = require('underscore');
var errors = require('susyweb-core-helpers').errors;
var oboe = require('oboe');
var IpcProvider = function IpcProvider(path, net) {
var _this = this;
this.responseCallbacks = {};
this.notificationCallbacks = [];
this.path = path;
this.connection = net.connect({path: this.path});
this.addDefaultEvents();
// LISTEN FOR CONNECTION RESPONSES
var <span class="fstat-no" title="function not covered" >callback = f</span>unction(result) {
var id = <span class="cstat-no" title="statement not covered" >null;</span>
// get the id which matches the returned id
<span class="cstat-no" title="statement not covered" > if(_.isArray(result)) {</span>
<span class="cstat-no" title="statement not covered" > result.forEach(<span class="fstat-no" title="function not covered" >function(</span>load){</span>
<span class="cstat-no" title="statement not covered" > if(_this.responseCallbacks[load.id])</span>
<span class="cstat-no" title="statement not covered" > id = load.id;</span>
});
} else {
<span class="cstat-no" title="statement not covered" > id = result.id;</span>
}
// notification
<span class="cstat-no" title="statement not covered" > if(!id && result.method.indexOf('_subscription') !== -1) {</span>
<span class="cstat-no" title="statement not covered" > _this.notificationCallbacks.forEach(<span class="fstat-no" title="function not covered" >function(</span>callback){</span>
<span class="cstat-no" title="statement not covered" > if(_.isFunction(callback))</span>
<span class="cstat-no" title="statement not covered" > callback(result);</span>
});
// fire the callback
} else <span class="cstat-no" title="statement not covered" >if(_this.responseCallbacks[id]) {</span>
<span class="cstat-no" title="statement not covered" > _this.responseCallbacks[id](null, result);</span>
<span class="cstat-no" title="statement not covered" > delete _this.responseCallbacks[id];</span>
}
};
// use oboe.js for Sockets
<span class="missing-if-branch" title="if path not taken" >I</span>if (net.constructor.name === 'Socket') {
<span class="cstat-no" title="statement not covered" > oboe(this.connection)</span>
.done(callback);
} else {
this.connection.on('data', <span class="fstat-no" title="function not covered" >function(</span>data){
<span class="cstat-no" title="statement not covered" > _this._parseResponse(data.toString()).forEach(callback);</span>
});
}
};
/**
Will add the error and end event to timeout existing calls
@method addDefaultEvents
*/
IpcProvider.prototype.addDefaultEvents = function(){
var _this = this;
this.connection.on('connect', <span class="fstat-no" title="function not covered" >function()</span>{
});
this.connection.on('error', function(){
_this._timeout();
});
this.connection.on('end', <span class="fstat-no" title="function not covered" >function()</span>{
<span class="cstat-no" title="statement not covered" > _this._timeout();</span>
});
this.connection.on('timeout', <span class="fstat-no" title="function not covered" >function()</span>{
<span class="cstat-no" title="statement not covered" > _this._timeout();</span>
});
};
/**
Will parse the response and make an array out of it.
NOTE, this exists for backwards compatibility reasons.
@method _parseResponse
@param {String} data
*/
IpcProvider.prototype._parseResponse = <span class="fstat-no" title="function not covered" >function(</span>data) {
var _this = <span class="cstat-no" title="statement not covered" >this,</span>
returnValues = <span class="cstat-no" title="statement not covered" >[];</span>
// DE-CHUNKER
var dechunkedData = <span class="cstat-no" title="statement not covered" >data</span>
.replace(/\}[\n\r]?\{/g,'}|--|{') // }{
.replace(/\}\][\n\r]?\[\{/g,'}]|--|[{') // }][{
.replace(/\}[\n\r]?\[\{/g,'}|--|[{') // }[{
.replace(/\}\][\n\r]?\{/g,'}]|--|{') // }]{
.split('|--|');
<span class="cstat-no" title="statement not covered" > dechunkedData.forEach(<span class="fstat-no" title="function not covered" >function(</span>data){</span>
// prepend the last chunk
<span class="cstat-no" title="statement not covered" > if(_this.lastChunk)</span>
<span class="cstat-no" title="statement not covered" > data = _this.lastChunk + data;</span>
var result = <span class="cstat-no" title="statement not covered" >null;</span>
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > result = JSON.parse(data);</span>
} catch(e) {
<span class="cstat-no" title="statement not covered" > _this.lastChunk = data;</span>
// start timeout to cancel all requests
<span class="cstat-no" title="statement not covered" > clearTimeout(_this.lastChunkTimeout);</span>
<span class="cstat-no" title="statement not covered" > _this.lastChunkTimeout = setTimeout(<span class="fstat-no" title="function not covered" >function()</span>{</span>
<span class="cstat-no" title="statement not covered" > _this._timeout();</span>
<span class="cstat-no" title="statement not covered" > throw errors.InvalidResponse(data);</span>
}, 1000 * 15);
<span class="cstat-no" title="statement not covered" > return;</span>
}
// cancel timeout and set chunk to null
<span class="cstat-no" title="statement not covered" > clearTimeout(_this.lastChunkTimeout);</span>
<span class="cstat-no" title="statement not covered" > _this.lastChunk = null;</span>
<span class="cstat-no" title="statement not covered" > if(result)</span>
<span class="cstat-no" title="statement not covered" > returnValues.push(result);</span>
});
<span class="cstat-no" title="statement not covered" > return returnValues;</span>
};
/**
Get the adds a callback to the responseCallbacks object,
which will be called if a response matching the response Id will arrive.
@method _addResponseCallback
*/
IpcProvider.prototype._addResponseCallback = <span class="fstat-no" title="function not covered" >function(</span>payload, callback) {
var id = <span class="cstat-no" title="statement not covered" >payload.id || payload[0].id;</span>
var method = <span class="cstat-no" title="statement not covered" >payload.method || payload[0].method;</span>
<span class="cstat-no" title="statement not covered" > this.responseCallbacks[id] = callback;</span>
<span class="cstat-no" title="statement not covered" > this.responseCallbacks[id].method = method;</span>
};
/**
Timeout all requests when the end/error event is fired
@method _timeout
*/
IpcProvider.prototype._timeout = function() {
for(var key in this.responseCallbacks) {
<span class="cstat-no" title="statement not covered" > if(this.responseCallbacks.hasOwnProperty(key)){</span>
<span class="cstat-no" title="statement not covered" > this.responseCallbacks[key](errors.InvalidConnection('on IPC'));</span>
<span class="cstat-no" title="statement not covered" > delete this.responseCallbacks[key];</span>
}
}
};
/**
Try to reconnect
@method reconnect
*/
IpcProvider.prototype.reconnect = <span class="fstat-no" title="function not covered" >function() </span>{
<span class="cstat-no" title="statement not covered" > this.connection.connect({path: this.path});</span>
};
IpcProvider.prototype.send = <span class="fstat-no" title="function not covered" >function (</span>payload, callback) {
// try reconnect, when connection is gone
<span class="cstat-no" title="statement not covered" > if(!this.connection.writable)</span>
<span class="cstat-no" title="statement not covered" > this.connection.connect({path: this.path});</span>
<span class="cstat-no" title="statement not covered" > this.connection.write(JSON.stringify(payload));</span>
<span class="cstat-no" title="statement not covered" > this._addResponseCallback(payload, callback);</span>
};
/**
Subscribes to provider events.provider
@method on
@param {String} type 'notification', 'connect', 'error', 'end' or 'data'
@param {Function} callback the callback to call
*/
IpcProvider.prototype.on = function (type, callback) {
<span class="missing-if-branch" title="if path not taken" >I</span>if(typeof callback !== 'function')
<span class="cstat-no" title="statement not covered" > throw new Error('The second parameter callback must be a function.');</span>
switch(type){
case 'data':
this.notificationCallbacks.push(callback);
break;
// adds error, end, timeout, connect
<span class="branch-1 cbranch-no" title="branch not covered" > default:</span>
<span class="cstat-no" title="statement not covered" > this.connection.on(type, callback);</span>
<span class="cstat-no" title="statement not covered" > break;</span>
}
};
/**
Subscribes to provider events.provider
@method on
@param {String} type 'connect', 'error', 'end' or 'data'
@param {Function} callback the callback to call
*/
IpcProvider.prototype.once = <span class="fstat-no" title="function not covered" >function (</span>type, callback) {
<span class="cstat-no" title="statement not covered" > if(typeof callback !== 'function')</span>
<span class="cstat-no" title="statement not covered" > throw new Error('The second parameter callback must be a function.');</span>
<span class="cstat-no" title="statement not covered" > this.connection.once(type, callback);</span>
};
/**
Removes event listener
@method removeListener
@param {String} type 'data', 'connect', 'error', 'end' or 'data'
@param {Function} callback the callback to call
*/
IpcProvider.prototype.removeListener = <span class="fstat-no" title="function not covered" >function (</span>type, callback) {
var _this = <span class="cstat-no" title="statement not covered" >this;</span>
<span class="cstat-no" title="statement not covered" > switch(type){</span>
case 'data':
<span class="cstat-no" title="statement not covered" > this.notificationCallbacks.forEach(<span class="fstat-no" title="function not covered" >function(</span>cb, index){</span>
<span class="cstat-no" title="statement not covered" > if(cb === callback)</span>
<span class="cstat-no" title="statement not covered" > _this.notificationCallbacks.splice(index, 1);</span>
});
<span class="cstat-no" title="statement not covered" > break;</span>
default:
<span class="cstat-no" title="statement not covered" > this.connection.removeListener(type, callback);</span>
<span class="cstat-no" title="statement not covered" > break;</span>
}
};
/**
Removes all event listeners
@method removeAllListeners
@param {String} type 'data', 'connect', 'error', 'end' or 'data'
*/
IpcProvider.prototype.removeAllListeners = <span class="fstat-no" title="function not covered" >function (</span>type) {
<span class="cstat-no" title="statement not covered" > switch(type){</span>
case 'data':
<span class="cstat-no" title="statement not covered" > this.notificationCallbacks = [];</span>
<span class="cstat-no" title="statement not covered" > break;</span>
default:
<span class="cstat-no" title="statement not covered" > this.connection.removeAllListeners(type);</span>
<span class="cstat-no" title="statement not covered" > break;</span>
}
};
/**
Resets the providers, clears all callbacks
@method reset
*/
IpcProvider.prototype.reset = <span class="fstat-no" title="function not covered" >function () </span>{
<span class="cstat-no" title="statement not covered" > this._timeout();</span>
<span class="cstat-no" title="statement not covered" > this.notificationCallbacks = [];</span>
<span class="cstat-no" title="statement not covered" > this.connection.removeAllListeners('error');</span>
<span class="cstat-no" title="statement not covered" > this.connection.removeAllListeners('end');</span>
<span class="cstat-no" title="statement not covered" > this.connection.removeAllListeners('timeout');</span>
<span class="cstat-no" title="statement not covered" > this.addDefaultEvents();</span>
};
module.exports = IpcProvider;
</pre></td></tr>
</table></pre>
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