sails-hook-cron
v3.2.0
Published
Sails hook for running tasks by cron
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sails-hook-cron
Sails hook for running cron tasks.
Getting Started
Install it via npm:
npm install sails-hook-cron
Configure config/cron.js
in your project:
module.exports.cron = {
myFirstJob: {
schedule: '* * * * * *',
onTick: function () {
console.log('You will see this every second');
console.log(`Also, sails object is available as this, e.g. ${this.config.environment}`);
}
}
};
Examples
Schedule field syntax is:
// ['seconds', 'minutes', 'hours', 'dayOfMonth', 'month', 'dayOfWeek']
module.exports.cron = {
firstJob: {
schedule: '30 47 15 17 may *',
// in May 17 15:47:30 GMT-0300 (BRT)
onTick: function() {
console.log('I will trigger in May 17 15:47:30');
},
timezone: 'America/Sao_Paulo'
// timezone Brazil example
}
};
You can define cron tasks only with required fields:
module.exports.cron = {
firstJob: {
schedule: '* * * * * *',
onTick: function() {
console.log('I am triggering every second');
}
},
secondJob: {
schedule: '*/5 * * * * *',
onTick: function() {
console.log('I am triggering every five seconds');
}
}
};
You can define advanced fields:
module.exports.cron = {
myJob: {
schedule: '* * * * * *',
onTick: function() {
console.log('I am triggering when time is come');
},
onComplete: function() {
console.log('I am triggering when job is complete');
},
start: true, // Start task immediately
timezone: 'Ukraine/Kiev', // Custom timezone
context: undefined, // Custom context for onTick callback
runOnInit: true // Will fire your onTick function as soon as the request initialization has happened.
}
};
You can get created jobs and start\stop them when you wish:
// config/cron.js
module.exports.cron = {
myJob: {
schedule: '* * * * * *',
onTick: function() {
console.log('I am triggering when time is come');
},
start: false
}
};
// api/controllers/SomeController.js
module.exports = {
someAction: function(req, res) {
sails.hooks.cron.jobs.myJob.start();
sails.hooks.cron.jobs.myJob.stop();
}
};
Context
There are three states for the context, i.e. this on onTick
call:
- When you don’t declare context -
this
points to the Sails object. - If you declare it as a null (
context: null
),this
points to the original context from the cron library. - Otherwise, if you declare a context with some object (
context: {foo: 'bar'}
),this
will point to the object instead.