Refactor echo plugin

flyteplugins/go/tasks/plugins/testing/echo.go

@@ -3,6 +3,7 @@
 import (
 	"context"
 	"fmt"
+	"sync"
 	"time"
 
 	idlcore "github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core"
@@ -20,6 +21,7 @@
 type EchoPlugin struct {
 	enqueueOwner   core.EnqueueOwner
 	taskStartTimes map[string]time.Time
+	sync.Mutex
 }
 
 func (e *EchoPlugin) GetID() string {
@@ -30,9 +32,11 @@
 	return core.PluginProperties{}
 }
 
-func (e *EchoPlugin) Handle(ctx context.Context, tCtx core.TaskExecutionContext) (core.Transition, error) {
-	echoConfig := ConfigSection.GetConfig().(*Config)
-
+// Enqueue the task to be re-evaluated after SleepDuration.
+// If the task is already enqueued, return the start time of the task.
+func (e *EchoPlugin) addTask(ctx context.Context, tCtx core.TaskExecutionContext) time.Time {
+	e.Lock()
+	defer e.Unlock()
 	var startTime time.Time
 	var exists bool
 	taskExecutionID := tCtx.TaskExecutionMetadata().GetTaskExecutionID().GetGeneratedName()
@@ -42,47 +46,34 @@
 
 		// start timer to enqueue owner once task sleep duration has elapsed
 		go func() {
+			echoConfig := ConfigSection.GetConfig().(*Config)
 			time.Sleep(echoConfig.SleepDuration.Duration)
 			if err := e.enqueueOwner(tCtx.TaskExecutionMetadata().GetOwnerID()); err != nil {
 				logger.Warnf(ctx, "failed to enqueue owner [%s]: %v", tCtx.TaskExecutionMetadata().GetOwnerID(), err)
 			}
 		}()
 	}
+	return startTime
+}
 
-	if time.Since(startTime) >= echoConfig.SleepDuration.Duration {
-		// copy inputs to outputs
-		inputToOutputVariableMappings, err := compileInputToOutputVariableMappings(ctx, tCtx)
-		if err != nil {
-			return core.UnknownTransition, err
-		}
-
-		if len(inputToOutputVariableMappings) > 0 {
-			inputLiterals, err := tCtx.InputReader().Get(ctx)
-			if err != nil {
-				return core.UnknownTransition, err
-			}
-
-			outputLiterals := make(map[string]*idlcore.Literal, len(inputToOutputVariableMappings))
-			for inputVariableName, outputVariableName := range inputToOutputVariableMappings {
-				outputLiterals[outputVariableName] = inputLiterals.Literals[inputVariableName]
-			}
+// Remove the task from the taskStartTimes map.
+func (e *EchoPlugin) removeTask(taskExecutionID string) {
+	e.Lock()
+	defer e.Unlock()
+	delete(e.taskStartTimes, taskExecutionID)
+}
 
-			outputLiteralMap := &idlcore.LiteralMap{
-				Literals: outputLiterals,
-			}
+func (e *EchoPlugin) Handle(ctx context.Context, tCtx core.TaskExecutionContext) (core.Transition, error) {
+	echoConfig := ConfigSection.GetConfig().(*Config)
 
-			outputFile := tCtx.OutputWriter().GetOutputPath()
-			if err := tCtx.DataStore().WriteProtobuf(ctx, outputFile, storage.Options{}, outputLiteralMap); err != nil {
-				return core.UnknownTransition, err
-			}
+	if echoConfig.SleepDuration.Duration == time.Duration(0) {
+		return copyInputsToOutputs(ctx, tCtx)
+	}
 
-			or := ioutils.NewRemoteFileOutputReader(ctx, tCtx.DataStore(), tCtx.OutputWriter(), 0)
-			if err = tCtx.OutputWriter().Put(ctx, or); err != nil {
-				return core.UnknownTransition, err
-			}
-		}
+	startTime := e.addTask(ctx, tCtx)
 
-		return core.DoTransition(core.PhaseInfoSuccess(nil)), nil
+	if time.Since(startTime) >= echoConfig.SleepDuration.Duration {
+		return copyInputsToOutputs(ctx, tCtx)
 	}
 
 	return core.DoTransition(core.PhaseInfoRunning(core.DefaultPhaseVersion, nil)), nil
@@ -94,10 +85,45 @@
 
 func (e *EchoPlugin) Finalize(ctx context.Context, tCtx core.TaskExecutionContext) error {
 	taskExecutionID := tCtx.TaskExecutionMetadata().GetTaskExecutionID().GetGeneratedName()
-	delete(e.taskStartTimes, taskExecutionID)
+	e.removeTask(taskExecutionID)
 	return nil
 }
 
+// copyInputsToOutputs copies the input literals to the output location.
+func copyInputsToOutputs(ctx context.Context, tCtx core.TaskExecutionContext) (core.Transition, error) {
+	inputToOutputVariableMappings, err := compileInputToOutputVariableMappings(ctx, tCtx)
+	if err != nil {
+		return core.UnknownTransition, err
+	}
+
+	if len(inputToOutputVariableMappings) > 0 {
+		inputLiterals, err := tCtx.InputReader().Get(ctx)
+		if err != nil {
+			return core.UnknownTransition, err
+		}
+
+		outputLiterals := make(map[string]*idlcore.Literal, len(inputToOutputVariableMappings))
+		for inputVariableName, outputVariableName := range inputToOutputVariableMappings {
+			outputLiterals[outputVariableName] = inputLiterals.Literals[inputVariableName]
+		}
+
+		outputLiteralMap := &idlcore.LiteralMap{
+			Literals: outputLiterals,
+		}
+
+		outputFile := tCtx.OutputWriter().GetOutputPath()
+		if err := tCtx.DataStore().WriteProtobuf(ctx, outputFile, storage.Options{}, outputLiteralMap); err != nil {
+			return core.UnknownTransition, err
+		}
+
+		or := ioutils.NewRemoteFileOutputReader(ctx, tCtx.DataStore(), tCtx.OutputWriter(), 0)
+		if err = tCtx.OutputWriter().Put(ctx, or); err != nil {
+			return core.UnknownTransition, err
+		}
+	}
+	return core.DoTransition(core.PhaseInfoSuccess(nil)), nil
+}
+
 func compileInputToOutputVariableMappings(ctx context.Context, tCtx core.TaskExecutionContext) (map[string]string, error) {
 	// validate outputs are castable from inputs otherwise error as this plugin is not applicable
 	taskTemplate, err := tCtx.TaskReader().Read(ctx)