Add Temporal worker and test client programs

Creates:
- cmd/worker/main.go: Worker that registers workflows and activities
- cmd/test-workflow/main.go: Test client to trigger workflows

Adds go.temporal.io/sdk dependency to go.mod.

cmd/test-workflow/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"time"
+
+	"go.temporal.io/sdk/client"
+	"github.com/Riotpiaole/homelab-frontend/internal/workflow"
+)
+
+func main() {
+	hostPort := flag.String("host", "temporal.temporal:7233", "Temporal server host:port")
+	namespace := flag.String("namespace", "production", "Temporal namespace")
+	taskQueue := flag.String("queue", "worker-production", "Task queue")
+	workflowType := flag.String("workflow", "HelloWorldWorkflow", "Workflow type")
+	workflowID := flag.String("id", "", "Workflow ID (auto-generated if not set)")
+	flag.Parse()
+
+	// Auto-generate ID
+	if *workflowID == "" {
+		*workflowID = fmt.Sprintf("test-%s-%d", *workflowType, time.Now().Unix())
+	}
+
+	log.Printf("Connecting to Temporal at %s (namespace: %s)", *hostPort, *namespace)
+
+	// Connect to Temporal
+	c, err := client.Dial(client.Options{
+		HostPort:  *hostPort,
+		Namespace: *namespace,
+	})
+	if err != nil {
+		log.Fatalf("Failed to connect: %v", err)
+	}
+	defer c.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	// Start workflow
+	log.Printf("Starting %s (ID: %s)", *workflowType, *workflowID)
+
+	var run client.WorkflowRun
+	switch *workflowType {
+	case "HelloWorldWorkflow":
+		run, err = c.ExecuteWorkflow(ctx, client.StartWorkflowOptions{
+			ID:        *workflowID,
+			TaskQueue: *taskQueue,
+		}, workflow.HelloWorldWorkflow, "World")
+
+	case "GreeterWorkflow":
+		run, err = c.ExecuteWorkflow(ctx, client.StartWorkflowOptions{
+			ID:        *workflowID,
+			TaskQueue: *taskQueue,
+		}, workflow.GreeterWorkflow, "Alice")
+
+	case "ProcessOrderWorkflow":
+		run, err = c.ExecuteWorkflow(ctx, client.StartWorkflowOptions{
+			ID:        *workflowID,
+			TaskQueue: *taskQueue,
+		}, workflow.ProcessOrderWorkflow, "ORDER-12345")
+
+	default:
+		log.Fatalf("Unknown workflow type: %s", *workflowType)
+	}
+
+	if err != nil {
+		log.Fatalf("Failed to start workflow: %v", err)
+	}
+
+	log.Printf("✓ Workflow submitted")
+	log.Printf("  Run ID:       %s", run.GetRunID())
+	log.Printf("  Workflow ID:  %s", *workflowID)
+	log.Printf("  Watch at:     http://localhost:8080/namespaces/%s/workflows/%s", *namespace, *workflowID)
+
+	// Try to get result
+	ctx2, cancel2 := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel2()
+
+	var result string
+	if err := run.Get(ctx2, &result); err != nil {
+		log.Printf("⏳ Workflow executing (or error): %v", err)
+	} else {
+		log.Printf("✓ Result: %s", result)
+	}
+}

cmd/worker/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"go.temporal.io/sdk/client"
+	"go.temporal.io/sdk/worker"
+	"github.com/Riotpiaole/homelab-frontend/internal/workflow"
+)
+
+func main() {
+	hostPort := flag.String("host", "temporal.temporal:7233", "Temporal server host:port")
+	namespace := flag.String("namespace", "production", "Temporal namespace")
+	taskQueue := flag.String("queue", "worker-production", "Task queue")
+	flag.Parse()
+
+	// Connect to Temporal server
+	c, err := client.Dial(client.Options{
+		HostPort:  *hostPort,
+		Namespace: *namespace,
+	})
+	if err != nil {
+		log.Fatalf("Failed to connect to Temporal: %v", err)
+	}
+	defer c.Close()
+
+	log.Printf("Connected to Temporal at %s (namespace: %s)", *hostPort, *namespace)
+
+	// Create worker
+	w := worker.New(c, *taskQueue, worker.Options{})
+
+	// Register workflows
+	w.RegisterWorkflow(workflow.HelloWorldWorkflow)
+	w.RegisterWorkflow(workflow.GreeterWorkflow)
+	w.RegisterWorkflow(workflow.ProcessOrderWorkflow)
+
+	// Register activities
+	w.RegisterActivity(workflow.GreetActivity)
+	w.RegisterActivity(workflow.ValidateOrderActivity)
+	w.RegisterActivity(workflow.ProcessPaymentActivity)
+	w.RegisterActivity(workflow.NotifyCustomerActivity)
+
+	log.Printf("Starting worker on task queue: %s", *taskQueue)
+
+	// Handle graceful shutdown
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		<-sigChan
+		log.Println("Shutting down worker...")
+		w.Stop()
+	}()
+
+	// Run worker (blocks)
+	if err := w.Run(worker.InterruptCh()); err != nil {
+		log.Fatalf("Worker error: %v", err)
+	}
+}

go.mod

@@ -1,5 +1,34 @@
 module github.com/Riotpiaole/homelab-frontend
 
-go 1.25.0
+go 1.25.4
 
-require gopkg.in/yaml.v3 v3.0.1 // indirect
+require (
+	go.temporal.io/sdk v1.48.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/mock v1.6.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.3.2 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.22.0 // indirect
+	github.com/nexus-rpc/nexus-proto-annotations v0.1.0 // indirect
+	github.com/nexus-rpc/sdk-go v0.7.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/robfig/cron v1.2.0 // indirect
+	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
+	go.temporal.io/api v1.63.4 // indirect
+	golang.org/x/net v0.55.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/text v0.37.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260414002931-afd174a4e478 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
+	google.golang.org/grpc v1.82.1 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+)

go.sum

@@ -1,3 +1,121 @@
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internal/workflow/helloworld.go

@@ -0,0 +1,56 @@
+package workflow
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"go.temporal.io/sdk/workflow"
+)
+
+// HelloWorldWorkflow is a simple hello world workflow
+func HelloWorldWorkflow(ctx workflow.Context, name string) (string, error) {
+	opts := workflow.ActivityOptions{
+		StartToCloseTimeout: time.Minute,
+	}
+	ctx = workflow.WithActivityOptions(ctx, opts)
+
+	var result string
+	if err := workflow.ExecuteActivity(ctx, GreetActivity, name).Get(ctx, &result); err != nil {
+		return "", err
+	}
+	return result, nil
+}
+
+// GreetActivity greets someone
+func GreetActivity(ctx context.Context, name string) (string, error) {
+	return fmt.Sprintf("Hello, %s!", name), nil
+}
+
+// ValidateOrderActivity validates an order
+func ValidateOrderActivity(ctx context.Context, orderID string) (bool, error) {
+	// Simulate validation
+	if orderID == "" {
+		return false, nil
+	}
+	return true, nil
+}
+
+// ProcessPaymentActivity processes payment
+func ProcessPaymentActivity(ctx context.Context, orderID string) (string, error) {
+	// Simulate payment processing
+	return fmt.Sprintf("payment-%s", orderID[:min(len(orderID), 3)]), nil
+}
+
+// NotifyCustomerActivity sends notification
+func NotifyCustomerActivity(ctx context.Context, orderID string) (string, error) {
+	// Simulate notification
+	return fmt.Sprintf("notified for order %s", orderID), nil
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}

internal/workflow/worker.go

@@ -0,0 +1,120 @@
+package workflow
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"go.temporal.io/sdk/client"
+	"go.temporal.io/sdk/worker"
+	"go.temporal.io/sdk/temporal"
+	"go.temporal.io/sdk/workflow"
+)
+
+// WorkerConfig holds worker configuration
+type WorkerConfig struct {
+	HostPort  string
+	Namespace string
+	TaskQueue string
+}
+
+// NewWorker creates and starts a Temporal worker
+func NewWorker(cfg WorkerConfig) error {
+	// Connect to Temporal server
+	c, err := client.Dial(client.Options{
+		HostPort:  cfg.HostPort,
+		Namespace: cfg.Namespace,
+	})
+	if err != nil {
+		return err
+	}
+	defer c.Close()
+
+	log.Printf("Connected to Temporal at %s (namespace: %s)", cfg.HostPort, cfg.Namespace)
+
+	// Create worker
+	w := worker.New(c, cfg.TaskQueue, worker.Options{})
+
+	// Register workflows
+	w.RegisterWorkflow(HelloWorldWorkflow)
+	w.RegisterWorkflow(GreeterWorkflow)
+	w.RegisterWorkflow(ProcessOrderWorkflow)
+
+	// Register activities
+	w.RegisterActivity(GreetActivity)
+	w.RegisterActivity(ValidateOrderActivity)
+	w.RegisterActivity(ProcessPaymentActivity)
+	w.RegisterActivity(NotifyCustomerActivity)
+
+	// Start worker (blocks until signal received)
+	log.Printf("Starting worker on task queue: %s", cfg.TaskQueue)
+
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		if err := w.Run(worker.InterruptCh()); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	// Wait for shutdown signal
+	<-sigChan
+	log.Println("Shutting down worker...")
+	w.Stop()
+
+	return nil
+}
+
+// ProcessOrderWorkflow demonstrates multi-step workflow with activities
+func ProcessOrderWorkflow(ctx workflow.Context, orderID string) (string, error) {
+	opts := workflow.ActivityOptions{
+		StartToCloseTimeout: 5 * time.Minute,
+		RetryPolicy: &temporal.RetryPolicy{
+			InitialInterval:    time.Second,
+			BackoffCoefficient: 2.0,
+			MaximumInterval:    time.Minute,
+			MaximumAttempts:    3,
+		},
+	}
+	ctx = workflow.WithActivityOptions(ctx, opts)
+
+	// Step 1: Validate order
+	var validated bool
+	if err := workflow.ExecuteActivity(ctx, ValidateOrderActivity, orderID).Get(ctx, &validated); err != nil {
+		return "", err
+	}
+	if !validated {
+		return "", temporal.NewApplicationError("invalid order", "InvalidOrder")
+	}
+
+	// Step 2: Process payment
+	var paymentID string
+	if err := workflow.ExecuteActivity(ctx, ProcessPaymentActivity, orderID).Get(ctx, &paymentID); err != nil {
+		return "", err
+	}
+
+	// Step 3: Notify customer
+	var notifyResult string
+	if err := workflow.ExecuteActivity(ctx, NotifyCustomerActivity, orderID).Get(ctx, &notifyResult); err != nil {
+		return "", err
+	}
+
+	return paymentID, nil
+}
+
+// GreeterWorkflow is a multi-step workflow
+func GreeterWorkflow(ctx workflow.Context, name string) (string, error) {
+	opts := workflow.ActivityOptions{
+		StartToCloseTimeout: 5 * time.Minute,
+	}
+	ctx = workflow.WithActivityOptions(ctx, opts)
+
+	var result string
+	if err := workflow.ExecuteActivity(ctx, GreetActivity, name).Get(ctx, &result); err != nil {
+		return "", err
+	}
+	return result, nil
+}