Remove event GenericSource, and address other code review comments. Also added deprecation info in comments.

client/alloc_runner_test.go

@@ -152,7 +152,7 @@ func TestAllocRunner_DeploymentHealth_Unhealthy_BadStart(t *testing.T) {
 	assert.NotNil(state)
 	assert.NotEmpty(state.Events)
 	last := state.Events[len(state.Events)-1]
-	assert.Equal(allocHealthEventSource, last.GenericSource)
+	assert.Equal(allocHealthEventSource, last.Type)
 	assert.Contains(last.Message, "failed task")
 }
 
@@ -202,7 +202,7 @@ func TestAllocRunner_DeploymentHealth_Unhealthy_Deadline(t *testing.T) {
 	assert.NotNil(state)
 	assert.NotEmpty(state.Events)
 	last := state.Events[len(state.Events)-1]
-	assert.Equal(allocHealthEventSource, last.GenericSource)
+	assert.Equal(allocHealthEventSource, last.Type)
 	assert.Contains(last.Message, "not running by deadline")
 }
 
@@ -412,7 +412,7 @@ func TestAllocRunner_DeploymentHealth_Unhealthy_Checks(t *testing.T) {
 	assert.NotNil(state)
 	assert.NotEmpty(state.Events)
 	last := state.Events[len(state.Events)-1]
-	assert.Equal(allocHealthEventSource, last.GenericSource)
+	assert.Equal(allocHealthEventSource, last.Type)
 	assert.Contains(last.Message, "Services not healthy by deadline")
 }
 

client/task_runner.go

@@ -543,6 +543,7 @@ func (r *TaskRunner) DestroyState() error {
 // setState is used to update the state of the task runner
 func (r *TaskRunner) setState(state string, event *structs.TaskEvent, lazySync bool) {
 	event.PopulateEventDisplayMessage()
+
 	// Persist our state to disk.
 	if err := r.SaveState(); err != nil {
 		r.logger.Printf("[ERR] client: failed to save state of Task Runner for task %q: %v", r.task.Name, err)
@@ -1752,8 +1753,8 @@ func (r *TaskRunner) Kill(source, reason string, fail bool) {
 }
 
 func (r *TaskRunner) EmitEvent(source, message string) {
-	event := structs.NewTaskEvent(structs.TaskGenericMessage).
+	event := structs.NewTaskEvent(source).
-		SetGenericSource(source).SetMessage(message)
+		SetMessage(message)
 	r.setState("", event, false)
 	r.logger.Printf("[DEBUG] client: event from %q for task %q in alloc %q: %v",
 		source, r.task.Name, r.alloc.ID, message)

command/alloc_status.go

@@ -325,20 +325,18 @@ func (c *AllocStatusCommand) outputTaskStatus(state *api.TaskState) {
 
 	size := len(state.Events)
 	for i, event := range state.Events {
-		if event.DisplayMessage != "" {
+		msg := event.DisplayMessage
-			formattedTime := formatUnixNanoTime(event.Time)
+		if msg == "" {
-			formattedDisplayMsg := fmt.Sprintf("%s|%s|%s", formattedTime, event.Type, event.DisplayMessage)
+			msg = buildDisplayMessage(event)
-			events[size-i] = formattedDisplayMsg
-		} else {
-			events[size-i] = buildDisplayMessage(event)
 		}
+		formattedTime := formatUnixNanoTime(event.Time)
+		events[size-i] = fmt.Sprintf("%s|%s|%s", formattedTime, event.Type, msg)
+		// Reverse order so we are sorted by time
 	}
 	c.Ui.Output(formatList(events))
 }
 
 func buildDisplayMessage(event *api.TaskEvent) string {
-	formattedTime := formatUnixNanoTime(event.Time)
-
 	// Build up the description based on the event type.
 	var desc string
 	switch event.Type {
@@ -447,8 +445,7 @@ func buildDisplayMessage(event *api.TaskEvent) string {
 		desc = event.Message
 	}
 
-	// Reverse order so we are sorted by time
+	return desc
-	return fmt.Sprintf("%s|%s|%s", formattedTime, event.Type, desc)
 }
 
 // outputTaskResources prints the task resources for the passed task and if

nomad/structs/structs.go

@@ -73,9 +73,6 @@ const (
 	ACLTokenUpsertRequestType
 	ACLTokenDeleteRequestType
 	ACLTokenBootstrapRequestType
-
-	// Constant for restart events that are within policy
-	ReasonWithinPolicy = "Restart within policy"
 )
 
 const (
@@ -2487,6 +2484,9 @@ const (
 	// RestartPolicyMinInterval is the minimum interval that is accepted for a
 	// restart policy.
 	RestartPolicyMinInterval = 5 * time.Second
+
+	// ReasonWithinPolicy describes restart events that are within policy
+	ReasonWithinPolicy = "Restart within policy"
 )
 
 // RestartPolicy configures how Tasks are restarted when they crash or fail.
@@ -3753,9 +3753,6 @@ const (
 
 	// TaskLeaderDead indicates that the leader task within the has finished.
 	TaskLeaderDead = "Leader Task Dead"
-
-	// TaskGenericMessage is used by various subsystems to emit a message.
-	TaskGenericMessage = "Generic"
 )
 
 // TaskEvent is an event that effects the state of a task and contains meta-data
@@ -3764,75 +3761,105 @@ type TaskEvent struct {
 	Type string
 	Time int64 // Unix Nanosecond timestamp
 
-	// FailsTask marks whether this event fails the task
+	Message string // A possible message explaining the termination of the task.
-	FailsTask bool
-
-	// Restart fields.
-	RestartReason string
-
-	// Setup Failure fields.
-	SetupError string
-
-	// Driver Failure fields.
-	DriverError string // A driver error occurred while starting the task.
-
-	// Task Terminated Fields.
-	ExitCode int    // The exit code of the task.
-	Signal   int    // The signal that terminated the task.
-	Message  string // A possible message explaining the termination of the task.
-
-	// Killing fields
-	KillTimeout time.Duration
-
-	// Task Killed Fields.
-	KillError string // Error killing the task.
-
-	// KillReason is the reason the task was killed
-	KillReason string
-
-	// TaskRestarting fields.
-	StartDelay int64 // The sleep period before restarting the task in unix nanoseconds.
-
-	// Artifact Download fields
-	DownloadError string // Error downloading artifacts
-
-	// Validation fields
-	ValidationError string // Validation error
-
-	// The maximum allowed task disk size.
-	DiskLimit int64
-
-	// Name of the sibling task that caused termination of the task that
-	// the TaskEvent refers to.
-	FailedSibling string
-
-	// VaultError is the error from token renewal
-	VaultError string
-
-	// TaskSignalReason indicates the reason the task is being signalled.
-	TaskSignalReason string
-
-	// TaskSignal is the signal that was sent to the task
-	TaskSignal string
-
-	// DriverMessage indicates a driver action being taken.
-	DriverMessage string
-
-	// GenericSource is the source of a message.
-	GenericSource string
 
 	// DisplayMessage is a human friendly message about the event
 	DisplayMessage string
 
 	// Details is a map with annotated info about the event
 	Details map[string]string
+
+	// DEPRECATION NOTICE: The following fields are deprecated and will be removed
+	// in a future release. Field values are available in the Details map.
+
+	// FailsTask marks whether this event fails the task.
+	// Deprecated, use Details["fails_task"] to access this.
+	FailsTask bool
+
+	// Restart fields.
+	// Deprecated, use Details["restart_reason"] to access this.
+	RestartReason string
+
+	// Setup Failure fields.
+	// Deprecated, use Details["setup_error"] to access this.
+	SetupError string
+
+	// Driver Failure fields.
+	// Deprecated, use Details["driver_error"] to access this.
+	DriverError string // A driver error occurred while starting the task.
+
+	// Task Terminated Fields.
+
+	// Deprecated, use Details["exit_code"] to access this.
+	ExitCode int // The exit code of the task.
+
+	// Deprecated, use Details["signal"] to access this.
+	Signal int // The signal that terminated the task.
+
+	// Killing fields
+	// Deprecated, use Details["kill_timeout"] to access this.
+	KillTimeout time.Duration
+
+	// Task Killed Fields.
+	// Deprecated, use Details["kill_error"] to access this.
+	KillError string // Error killing the task.
+
+	// KillReason is the reason the task was killed
+	// Deprecated, use Details["kill_reason"] to access this.
+	KillReason string
+
+	// TaskRestarting fields.
+	// Deprecated, use Details["start_delay"] to access this.
+	StartDelay int64 // The sleep period before restarting the task in unix nanoseconds.
+
+	// Artifact Download fields
+	// Deprecated, use Details["download_error"] to access this.
+	DownloadError string // Error downloading artifacts
+
+	// Validation fields
+	// Deprecated, use Details["validation_error"] to access this.
+	ValidationError string // Validation error
+
+	// The maximum allowed task disk size.
+	// Deprecated, use Details["disk_limit"] to access this.
+	DiskLimit int64
+
+	// Name of the sibling task that caused termination of the task that
+	// the TaskEvent refers to.
+	// Deprecated, use Details["failed_sibling"] to access this.
+	FailedSibling string
+
+	// VaultError is the error from token renewal
+	// Deprecated, use Details["vault_renewal_error"] to access this.
+	VaultError string
+
+	// TaskSignalReason indicates the reason the task is being signalled.
+	// Deprecated, use Details["task_signal_reason"] to access this.
+	TaskSignalReason string
+
+	// TaskSignal is the signal that was sent to the task
+	// Deprecated, use Details["task_signal"] to access this.
+	TaskSignal string
+
+	// DriverMessage indicates a driver action being taken.
+	// Deprecated, use Details["driver_message"] to access this.
+	DriverMessage string
+
+	// GenericSource is the source of a message.
+	// Deprecated, is redundant with event type.
+	GenericSource string
 }
 
 func (event *TaskEvent) PopulateEventDisplayMessage() {
 	// Build up the description based on the event type.
-	if event == nil { //TODO PA needs investigation alloc_runner's Run method sends a nil event when sigterming nomad. Why?
+	if event == nil { //TODO(preetha) needs investigation alloc_runner's Run method sends a nil event when sigterming nomad. Why?
 		return
 	}
+
+	if event.DisplayMessage != "" {
+		return
+	}
+
 	var desc string
 	switch event.Type {
 	case TaskSetup:
@@ -3935,9 +3962,6 @@ func (event *TaskEvent) PopulateEventDisplayMessage() {
 		desc = event.DriverMessage
 	case TaskLeaderDead:
 		desc = "Leader Task in Group dead"
-	case TaskGenericMessage:
-		event.Type = event.GenericSource
-		desc = event.Message
 	default:
 		desc = ""
 	}
@@ -4103,12 +4127,6 @@ func (e *TaskEvent) SetDriverMessage(m string) *TaskEvent {
 	return e
 }
 
-func (e *TaskEvent) SetGenericSource(s string) *TaskEvent {
-	e.GenericSource = s
-	e.Details["generic_source"] = s
-	return e
-}
-
 // TaskArtifact is an artifact to download before running the task.
 type TaskArtifact struct {
 	// GetterSource is the source to download an artifact using go-getter