Add conversion responder

src/lib/responders/conversion.js

+const
+  config = require('config'),
+  Queue = require('bull'),
+  { DateTime } = require('luxon'),
+  { ObjectUtil } = require('mbjs-utils'),
+  cote = require('cote')
+
+const init = async function () {
+  const
+    queue = new Queue('conversions', config.conversions.redisURL),
+    conversionService = new cote.Responder({ name: 'Conversion Service' })
+
+  queue.process(parseInt(config.conversions.concurrency), require('../workers/convert'))
+
+  conversionService.on('start', (req, cb) => {
+    const jobId = ObjectUtil.uuid4()
+    queue.add(req, { jobId })
+    cb({ jobId })
+  })
+
+  conversionService.on('status', async (req, cb) => {
+    const job = await queue.getJob(req.id)
+    if (!job) return cb(null)
+
+    const jobInfo = {
+      uuid: job.id,
+      source: job.data.source,
+      result: job.returnvalue,
+      failed: typeof job.failedReason !== 'undefined',
+      attempts: job.attemptsMade,
+      progress: job.progress,
+      delay: job.delay,
+      created: DateTime.fromMillis(job.timestamp).toISO(),
+      processed: job.processedOn ? DateTime.fromMillis(job.processedOn).toISO() : undefined,
+      finished: job.finishedOn ? DateTime.fromMillis(job.finishedOn).toISO() : undefined
+    }
+
+    cb(jobInfo)
+  })
+}
+
+init()