From f5028693a896a3076dd286ac0030e3d8f78f5ebf Mon Sep 17 00:00:00 2001
From: Chocobozzz <florian.bigard@gmail.com>
Date: Wed, 25 Oct 2017 16:03:33 +0200
Subject: Use async/await in lib and initializers

---
 server/lib/jobs/job-scheduler.ts | 118 +++++++++++++++++++++------------------
 1 file changed, 63 insertions(+), 55 deletions(-)

(limited to 'server/lib/jobs/job-scheduler.ts')

diff --git a/server/lib/jobs/job-scheduler.ts b/server/lib/jobs/job-scheduler.ts
index c2409d20c..61d483268 100644
--- a/server/lib/jobs/job-scheduler.ts
+++ b/server/lib/jobs/job-scheduler.ts
@@ -23,7 +23,7 @@ class JobScheduler {
     return this.instance || (this.instance = new this())
   }
 
-  activate () {
+  async activate () {
     const limit = JOBS_FETCH_LIMIT_PER_CYCLE
 
     logger.info('Jobs scheduler activated.')
@@ -32,32 +32,36 @@ class JobScheduler {
 
     // Finish processing jobs from a previous start
     const state = JOB_STATES.PROCESSING
-    db.Job.listWithLimit(limit, state)
-      .then(jobs => {
-        this.enqueueJobs(jobsQueue, jobs)
-
-        forever(
-          next => {
-            if (jobsQueue.length() !== 0) {
-              // Finish processing the queue first
-              return setTimeout(next, JOBS_FETCHING_INTERVAL)
-            }
-
-            const state = JOB_STATES.PENDING
-            db.Job.listWithLimit(limit, state)
-              .then(jobs => {
-                this.enqueueJobs(jobsQueue, jobs)
-
-                // Optimization: we could use "drain" from queue object
-                return setTimeout(next, JOBS_FETCHING_INTERVAL)
-              })
-              .catch(err => logger.error('Cannot list pending jobs.', err))
-          },
-
-          err => logger.error('Error in job scheduler queue.', err)
-        )
-      })
-      .catch(err => logger.error('Cannot list pending jobs.', err))
+    try {
+      const jobs = await db.Job.listWithLimit(limit, state)
+
+      this.enqueueJobs(jobsQueue, jobs)
+    } catch (err) {
+      logger.error('Cannot list pending jobs.', err)
+    }
+
+    forever(
+      async next => {
+        if (jobsQueue.length() !== 0) {
+          // Finish processing the queue first
+          return setTimeout(next, JOBS_FETCHING_INTERVAL)
+        }
+
+        const state = JOB_STATES.PENDING
+        try {
+          const jobs = await db.Job.listWithLimit(limit, state)
+
+          this.enqueueJobs(jobsQueue, jobs)
+        } catch (err) {
+          logger.error('Cannot list pending jobs.', err)
+        }
+
+        // Optimization: we could use "drain" from queue object
+        return setTimeout(next, JOBS_FETCHING_INTERVAL)
+      },
+
+      err => logger.error('Error in job scheduler queue.', err)
+    )
   }
 
   createJob (transaction: Sequelize.Transaction, handlerName: string, handlerInputData: object) {
@@ -75,7 +79,7 @@ class JobScheduler {
     jobs.forEach(job => jobsQueue.push(job))
   }
 
-  private processJob (job: JobInstance, callback: (err: Error) => void) {
+  private async processJob (job: JobInstance, callback: (err: Error) => void) {
     const jobHandler = jobHandlers[job.handlerName]
     if (jobHandler === undefined) {
       logger.error('Unknown job handler for job %s.', job.handlerName)
@@ -85,41 +89,45 @@ class JobScheduler {
     logger.info('Processing job %d with handler %s.', job.id, job.handlerName)
 
     job.state = JOB_STATES.PROCESSING
-    return job.save()
-      .then(() => {
-        return jobHandler.process(job.handlerInputData, job.id)
-      })
-      .then(
-        result => {
-          return this.onJobSuccess(jobHandler, job, result)
-        },
-
-        err => {
-          logger.error('Error in job handler %s.', job.handlerName, err)
-          return this.onJobError(jobHandler, job, err)
-        }
-      )
-      .then(() => callback(null))
-      .catch(err => {
-        this.cannotSaveJobError(err)
-        return callback(err)
-      })
+    await job.save()
+
+    try {
+      const result = await jobHandler.process(job.handlerInputData, job.id)
+      await this.onJobSuccess(jobHandler, job, result)
+    } catch (err) {
+      logger.error('Error in job handler %s.', job.handlerName, err)
+
+      try {
+        await this.onJobError(jobHandler, job, err)
+      } catch (innerErr) {
+        this.cannotSaveJobError(innerErr)
+        return callback(innerErr)
+      }
+    }
+
+    callback(null)
   }
 
-  private onJobError (jobHandler: JobHandler<any>, job: JobInstance, err: Error) {
+  private async onJobError (jobHandler: JobHandler<any>, job: JobInstance, err: Error) {
     job.state = JOB_STATES.ERROR
 
-    return job.save()
-      .then(() => jobHandler.onError(err, job.id))
-      .catch(err => this.cannotSaveJobError(err))
+    try {
+      await job.save()
+      await jobHandler.onError(err, job.id)
+    } catch (err) {
+      this.cannotSaveJobError(err)
+    }
   }
 
-  private onJobSuccess (jobHandler: JobHandler<any>, job: JobInstance, jobResult: any) {
+  private async onJobSuccess (jobHandler: JobHandler<any>, job: JobInstance, jobResult: any) {
     job.state = JOB_STATES.SUCCESS
 
-    return job.save()
-      .then(() => jobHandler.onSuccess(job.id, jobResult))
-      .catch(err => this.cannotSaveJobError(err))
+    try {
+      await job.save()
+      jobHandler.onSuccess(job.id, jobResult)
+    } catch (err) {
+      this.cannotSaveJobError(err)
+    }
   }
 
   private cannotSaveJobError (err: Error) {
-- 
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