usher
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Simple DSL for composing decision workflows for AWS Simple Workflow
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<h1 class="page-title">Source: activity/task.js</h1>
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<pre class="prettyprint source linenums"><code>/*!
* Usher
* Copyright(c) 2014 meltmedia <mike@meltmedia.com>
*/
'use strict';
var winston = require('winston');
module.exports = ActivityTask;
/**
* The context for the execution of the activity
* @constructor
* @param {string} task - The raw `aws-swf` activity task
*/
function ActivityTask(task) {
if (!(this instanceof ActivityTask)) {
return new ActivityTask(task);
}
this.input = {};
if (task.config.input) {
this.input = JSON.parse(task.config.input);
}
// Depending on the language of the Decider impl, this can be an Array or Object
// This is a big assumption, maybe make this configurable
if (Array.isArray(this.input)) {
this.input = this.input[0];
}
this.activityId = task.config.activityId;
this.activityType = task.config.activityType;
this.startedEventId = task.config.startedEventId;
this.taskToken = task.config.taskToken;
this.workflowExecution = task.config.workflowExecution;
this._task = task;
// Register a hearbeat callback every 10 seconds
this.hearbeatCount = 0;
this.heartbeatTimer = setInterval(function () {
var self = this;
self._task.recordHeartbeat(
{ activity: self.activityType.name, id: self.activityId, count: self.hearbeatCount++ },
function (err) {
if (err) {
winston.log('debug', 'Heartbead failed for task: %s (%s) due to:', self.activityType.name, self.activityId, err);
}
});
}.bind(this), 10000);
}
/**
* Execute once the activity has completed successfuly
*
* @param {object} output - The results of the activity, if any
* @param {function} [cb] - Callback to run once we have successfuly informed SWF of our status
*/
ActivityTask.prototype.success = function (output, cb) {
var self = this;
cb = cb || function () {};
winston.log('debug', 'Activity task: %s (%s) completed successfuly', this.activityType.name, self.activityId);
// Stop heartbeat timer
clearInterval(self.heartbeatTimer);
this._task.respondCompleted(output, function (err) {
if (err) {
return winston.log('warn', 'Unable to complete activity task: %s (%s) due to: %s', self.activityType.name, self.activityId, err);
}
winston.log('verbose', 'Completed activity task: %s (%s)', self.activityType.name, self.activityId);
cb(err);
});
};
/**
* Execute if the activity failed
*
* @param {string} name - A unique name for the failure
* @param {object} [err] - The reason for the failure
* @param {boolean} [retriable] - A hint to if the activity should be attempted again
* @param {function} [cb] - Callback to run once we have successfuly informed SWF of our status
*/
ActivityTask.prototype.failed = function (name, err, retriable, cb) {
var self = this;
cb = cb || function () {};
winston.log('debug', 'Activity task: %s (%s) failed, due to: %s', this.activityType.name, this.activityId, name);
// Stop heartbeat timer
clearInterval(self.heartbeatTimer);
var message = {
name: name,
retriable: retriable || false,
message: err.message || err
};
this._task.respondFailed(name, JSON.stringify(message), function (e) {
if (e) {
return winston.log('warn', 'Unable to fail activity task: %s (%s) due to:', self.activityType.name, self.activityId, e);
}
winston.log('warn', 'Failed activity task: %s (%s) due to:', self.activityType.name, self.activityId, message);
cb(e);
});
};
</code></pre>
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<h2><a href="index.html">Index</a></h2><h3>Classes</h3><ul><li><a href="Accumulator.html">Accumulator</a></li><li><a href="ActivityPoller.html">ActivityPoller</a></li><li><a href="ActivityTask.html">ActivityTask</a></li><li><a href="DecisionPoller.html">DecisionPoller</a></li><li><a href="Fragment.html">Fragment</a></li><li><a href="Loop.html">Loop</a></li><li><a href="Usher.html">Usher</a></li><li><a href="WhileLoop.html">WhileLoop</a></li><li><a href="WorkflowVersion.html">WorkflowVersion</a></li></ul>
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