rc: factor out duplicate code in job creation

fs/rc/jobs/job.go

@@ -184,15 +184,15 @@ func getGroup(in rc.Params) string {
 	return group
 }
 
-// NewAsyncJob start a new asynchronous Job off
-func (jobs *Jobs) NewAsyncJob(fn rc.Func, in rc.Params) *Job {
+// NewJob creates a Job ready to be executed
+func (jobs *Jobs) NewJob(ctx context.Context, in rc.Params) (*Job, context.Context) {
 	id := atomic.AddInt64(&jobID, 1)
 
 	group := getGroup(in)
 	if group == "" {
 		group = fmt.Sprintf("job/%d", id)
 	}
-	ctx := accounting.WithStatsGroup(context.Background(), group)
+	ctx = accounting.WithStatsGroup(ctx, group)
 	ctx, cancel := context.WithCancel(ctx)
 	stop := func() {
 		cancel()
@@ -208,36 +208,16 @@ func (jobs *Jobs) NewAsyncJob(fn rc.Func, in rc.Params) *Job {
 	jobs.mu.Lock()
 	jobs.jobs[job.ID] = job
 	jobs.mu.Unlock()
-	go job.run(ctx, fn, in)
-	return job
-}
-
-// NewSyncJob start a new synchronous Job off
-func (jobs *Jobs) NewSyncJob(ctx context.Context, in rc.Params) (*Job, context.Context) {
-	id := atomic.AddInt64(&jobID, 1)
-	group := getGroup(in)
-	if group == "" {
-		group = fmt.Sprintf("job/%d", id)
-	}
-	ctxG := accounting.WithStatsGroup(ctx, fmt.Sprintf("job/%d", id))
-	ctx, cancel := context.WithCancel(ctxG)
-	stop := func() {
-		cancel()
-		// Wait for cancel to propagate before returning.
-		<-ctx.Done()
-	}
-	job := &Job{
-		ID:        id,
-		Group:     group,
-		StartTime: time.Now(),
-		Stop:      stop,
-	}
-	jobs.mu.Lock()
-	jobs.jobs[job.ID] = job
-	jobs.mu.Unlock()
 	return job, ctx
 }
 
+// NewAsyncJob start a new asynchronous Job off
+func (jobs *Jobs) NewAsyncJob(fn rc.Func, in rc.Params) *Job {
+	job, ctx := jobs.NewJob(context.Background(), in)
+	go job.run(ctx, fn, in)
+	return job
+}
+
 // StartAsyncJob starts a new job asynchronously and returns a Param suitable
 // for output.
 func StartAsyncJob(fn rc.Func, in rc.Params) (rc.Params, error) {
@@ -250,7 +230,7 @@ func StartAsyncJob(fn rc.Func, in rc.Params) (rc.Params, error) {
 // ExecuteJob executes new job synchronously and returns a Param suitable for
 // output.
 func ExecuteJob(ctx context.Context, fn rc.Func, in rc.Params) (rc.Params, int64, error) {
-	job, ctx := running.NewSyncJob(ctx, in)
+	job, ctx := running.NewJob(ctx, in)
 	job.run(ctx, fn, in)
 	return job.Output, job.ID, job.realErr
 }