rc: add executeId to job statuses - fixes #8972

docs/content/rc.md

@@ -257,7 +257,7 @@ Each rc call is classified as a job and it is assigned its own id. By default
 jobs are executed immediately as they are created or synchronously.
 
 If `_async` has a true value when supplied to an rc call then it will
-return immediately with a job id and the task will be run in the
+return immediately with a job id and execute id, and the task will be run in the
 background. The `job/status` call can be used to get information of
 the background job. The job can be queried for up to 1 minute after
 it has finished.
@@ -272,10 +272,16 @@ Starting a job with the `_async` flag:
 ```console
 $ rclone rc --json '{ "p1": [1,"2",null,4], "p2": { "a":1, "b":2 }, "_async": true }' rc/noop
 {
-    "jobid": 2
+    "jobid": 2,
+    "executeId": "d794c33c-463e-4acf-b911-f4b23e4f40b7"
 }
 ```
 
+The `jobid` is a unique identifier for the job within this rclone instance.
+The `executeId` identifies the rclone process instance and changes after
+rclone restart. Together, the pair (`executeId`, `jobid`) uniquely identifies
+a job across rclone restarts.
+
 Query the status to see if the job has finished.  For more information
 on the meaning of these return parameters see the `job/status` call.
 
@@ -285,6 +291,7 @@ $ rclone rc --json '{ "jobid":2 }' job/status
     "duration": 0.000124163,
     "endTime": "2018-10-27T11:38:07.911245881+01:00",
     "error": "",
+    "executeId": "d794c33c-463e-4acf-b911-f4b23e4f40b7",
     "finished": true,
     "id": 2,
     "output": {
@@ -305,17 +312,31 @@ $ rclone rc --json '{ "jobid":2 }' job/status
 }
 ```
 
-`job/list` can be used to show the running or recently completed jobs
+`job/list` can be used to show running or recently completed jobs along with their status
 
 ```console
 $ rclone rc job/list
 {
+    "executeId": "d794c33c-463e-4acf-b911-f4b23e4f40b7",
+    "finished_ids": [
+        1
+    ],
     "jobids": [
+        1,
+        2
+    ],
+    "running_ids": [
         2
     ]
 }
 ```
 
+This shows:
+- `executeId` - the current rclone instance ID (same for all jobs, changes after restart)
+- `jobids` - array of all job IDs (both running and finished)
+- `running_ids` - array of currently running job IDs
+- `finished_ids` - array of finished job IDs
+
 ### Setting config flags with _config
 
 If you wish to set config (the equivalent of the global flags) for the

fs/rc/jobs/job.go

@@ -34,6 +34,7 @@ func init() {
 type Job struct {
 	mu        sync.Mutex
 	ID        int64     `json:"id"`
+	ExecuteID string    `json:"executeId"`
 	Group     string    `json:"group"`
 	StartTime time.Time `json:"startTime"`
 	EndTime   time.Time `json:"endTime"`
@@ -125,6 +126,7 @@ type Jobs struct {
 var (
 	running = newJobs()
 	jobID   atomic.Int64
+	// executeID is a unique ID for this rclone execution
 	executeID = uuid.New().String()
 )
 
@@ -313,6 +315,7 @@ func (jobs *Jobs) NewJob(ctx context.Context, fn rc.Func, in rc.Params) (job *Jo
 	}
 	job = &Job{
 		ID:        id,
+		ExecuteID: executeID,
 		Group:     group,
 		StartTime: time.Now(),
 		Stop:      stop,
@@ -329,6 +332,7 @@ func (jobs *Jobs) NewJob(ctx context.Context, fn rc.Func, in rc.Params) (job *Jo
 		go job.run(ctx, fn, in)
 		out = make(rc.Params)
 		out["jobid"] = job.ID
+		out["executeId"] = job.ExecuteID
 		err = nil
 	} else {
 		job.run(ctx, fn, in)
@@ -386,6 +390,7 @@ Results:
 - error - error from the job or empty string for no error
 - finished - boolean whether the job has finished or not
 - id - as passed in above
+- executeId - rclone instance ID (changes after restart); combined with id uniquely identifies a job
 - startTime - time the job started (e.g. "2018-10-26T18:50:20.528336039+01:00")
 - success - boolean - true for success false otherwise
 - output - output of the job as would have been returned if called synchronously

fs/rc/jobs/job_test.go

@@ -56,7 +56,7 @@ func TestJobsExpire(t *testing.T) {
 		return in, nil
 	}, rc.Params{"_async": true})
 	require.NoError(t, err)
-	assert.Equal(t, 1, len(out))
+	assert.Equal(t, 2, len(out), "check output has jobid and executeId")
 	<-wait
 	assert.Equal(t, job.ID, gotJobID, "check can get JobID from ctx")
 	assert.Equal(t, job, gotJob, "check can get Job from ctx")
@@ -96,6 +96,18 @@ func TestJobsIDs(t *testing.T) {
 	assert.Equal(t, wantIDs, gotIDs)
 }
 
+func TestJobsExecuteIDs(t *testing.T) {
+	ctx := context.Background()
+	jobs := newJobs()
+	job1, _, err := jobs.NewJob(ctx, noopFn, rc.Params{"_async": true})
+	require.NoError(t, err)
+	job2, _, err := jobs.NewJob(ctx, noopFn, rc.Params{"_async": true})
+	require.NoError(t, err)
+	assert.Equal(t, executeID, job1.ExecuteID, "execute ID should match global executeID")
+	assert.Equal(t, executeID, job2.ExecuteID, "execute ID should match global executeID")
+	assert.True(t, job1.ExecuteID == job2.ExecuteID, "just to be sure, all the jobs share the same executeID")
+}
+
 func TestJobsGet(t *testing.T) {
 	ctx := context.Background()
 	jobs := newJobs()
@@ -234,7 +246,8 @@ func TestJobsNewJob(t *testing.T) {
 	job, out, err := jobs.NewJob(ctx, noopFn, rc.Params{"_async": true})
 	require.NoError(t, err)
 	assert.Equal(t, int64(1), job.ID)
-	assert.Equal(t, rc.Params{"jobid": int64(1)}, out)
+	assert.Equal(t, executeID, job.ExecuteID)
+	assert.Equal(t, rc.Params{"jobid": int64(1), "executeId": executeID}, out)
 	assert.Equal(t, job, jobs.Get(1))
 	assert.NotEmpty(t, job.Stop)
 }
@@ -244,8 +257,9 @@ func TestStartJob(t *testing.T) {
 	jobID.Store(0)
 	job, out, err := NewJob(ctx, longFn, rc.Params{"_async": true})
 	assert.NoError(t, err)
-	assert.Equal(t, rc.Params{"jobid": int64(1)}, out)
+	assert.Equal(t, rc.Params{"jobid": int64(1), "executeId": executeID}, out)
 	assert.Equal(t, int64(1), job.ID)
+	assert.Equal(t, executeID, job.ExecuteID)
 }
 
 func TestExecuteJob(t *testing.T) {
@@ -350,6 +364,7 @@ func TestRcJobStatus(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, out)
 	assert.Equal(t, float64(1), out["id"])
+	assert.Equal(t, executeID, out["executeId"])
 	assert.Equal(t, "", out["error"])
 	assert.Equal(t, false, out["finished"])
 	assert.Equal(t, false, out["success"])
@@ -377,6 +392,7 @@ func TestRcJobList(t *testing.T) {
 	out1, err := call.Fn(context.Background(), in)
 	require.NoError(t, err)
 	require.NotNil(t, out1)
+	assert.Equal(t, executeID, out1["executeId"], "should have executeId")
 	assert.Equal(t, []int64{1}, out1["jobids"], "should have job listed")
 	assert.Equal(t, []int64{1}, out1["running_ids"], "should have running job")
 	assert.Equal(t, []int64{}, out1["finished_ids"], "should not have finished job")
@@ -392,7 +408,6 @@ func TestRcJobList(t *testing.T) {
 	require.NotNil(t, out2)
 	assert.Equal(t, 2, len(out2["jobids"].([]int64)), "should have all jobs listed")
 
-	require.NotNil(t, out1["executeId"], "should have executeId")
 	assert.Equal(t, out1["executeId"], out2["executeId"], "executeId should be the same")
 }