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index.js
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index.js
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const Koa = require('koa')
const Router = require('koa-router')
const Parser = require('koa-bodyparser')
const Ilp = require('koa-ilp')
const plugin = require('ilp-plugin')()
const ilp = new Ilp({ plugin })
const request = require('superagent')
const agent = require('superagent-ilp')(request, plugin)
const council = require('council')({ plugin })
const codiusHostPromise = council('org.codius')
// TODO: persistence
const debug = require('debug')('crontract')
const cron = require('cron')
const crypto = require('crypto')
const childProcess = require('child_process')
const jobs = {}
const TASK_TIMEOUT = 10000
const app = new Koa()
const router = Router()
const parser = Parser()
router.get('/', async (ctx) => {
ctx.body = 'Hello World!'
})
/* {
time: '* * * * *',
run: '...',
}
*/
router.post('/jobs/:job', ilp.paid({ price: 1000 }), async (ctx) => {
const jobInfo = jobs[ctx.params.job]
const body = ctx.request.body
if (jobInfo) {
ctx.throw(422, JSON.stringify({ error: 'a job with that ID already exists' }))
return
}
const token = crypto.randomBytes(16).toString('base64')
const timeZone = body.timezone || 'America/Los_Angeles'
const { time, task } = body
const job = new cron.CronJob({
cronTime: time,
onTick: runJob.bind(null, ctx.params.job),
start: true,
timeZone
})
jobs[ctx.params.job] = {
token,
job,
task,
time,
timeZone
}
debug('added job with id %s', ctx.params.job)
ctx.body = {
token,
task,
time,
timeZone
}
ctx.status = 201
})
function getJobInfo (ctx) {
const jobInfo = jobs[ctx.params.job]
if (!jobInfo) {
ctx.throw(422, JSON.stringify({ error: 'no job with the given ID exists' }))
return
} else if (ctx.get('authorization') !== `Bearer ${jobInfo.token}`) {
ctx.throw(403, JSON.stringify({ error: 'unauthorized' }))
}
return jobInfo
}
router.delete('/jobs/:job', async (ctx) => {
const jobInfo = getJobInfo(ctx)
jobInfo.job.stop()
debug('stopped job with id %s', ctx.params.job)
ctx.status = 200
})
router.get('/jobs/:job', async (ctx) => {
const jobInfo = getJobInfo(ctx)
const { token, task, time, timeZone } = jobInfo
debug('fetched job with id %s', ctx.params.job)
ctx.body = {
token,
task,
time,
timeZone
}
})
async function runJob (id) {
debug('called job with id %s', id)
const codiusHosts = await codiusHostPromise
const manifest = {
image: 'sharafian/crontract-task',
port: 9999, // no port used
environment: {},
command: [ '/bin/bash', '-c', jobs[id].task ]
}
debug('calling codius')
await agent
.post(codiusHosts[0].host + '/start')
.send({ manifest })
.query({ duration: 10 })
.pay(1000000)
}
app
.use(parser)
.use(router.allowedMethods())
.use(router.routes())
.listen(5001)