fix redis 4 (#449)

compile/src/handlers/worker.js

@@ -2,10 +2,24 @@ const { processJob } = require("../controllers/job")
 const { compileLog } = require("../utils/base")
 
 const Queue = require("bull")
+const redisUrlParse = require("redis-url-parse")
 
 // Connect to a local redis instance locally, and the Heroku-provided URL in production
 const REDIS_URL = process.env.REDIS_URL || "redis://compile_queue:6379"
-
+const { host, port, password } = redisUrlParse(REDIS_URL)
+const bullOptions = REDIS_URL.includes("rediss://")
+  ? {
+      redis: {
+        port: Number(port),
+        host,
+        password,
+        tls: {
+          rejectUnauthorized: false,
+          requestCert: true,
+        },
+      },
+    }
+  : REDIS_URL
 // The maximum number of jobs each worker should process at once
 // Each job is CPU-intensive, so this value should not be too high
 const maxJobsPerWorker = process.env.JOB_CONCURRENCY || 1
@@ -20,9 +34,7 @@ module.exports.start = id => {
   compileLog(`Started worker ${id}`)
 
   // Connect to the named queue
-  const compile_queue = new Queue("submissions", REDIS_URL, {
-    redis: { tls: { rejectUnauthorized: false, requestCert: true } },
-  })
+  const compile_queue = new Queue("submissions", bullOptions)
 
   // start processing jobs from the submission queue
   compile_queue.process(maxJobsPerWorker, processJob)