fix: switch PullSchemaResponse.deployment_key to optional

This reflects the fact that builtin modules will not have an associated
deployment key.

Also use strongly typed model.DeploymentKey where appropriate.

backend/controller/controller.go

@@ -1531,7 +1531,7 @@ func (s *Service) watchModuleChanges(ctx context.Context, sendChange func(respon
 				moduleRemoved := mostRecentDeploymentByModule[name] == deletion.String()
 				response = &ftlv1.PullSchemaResponse{
 					ModuleName:    name,
-					DeploymentKey: deletion.String(),
+					DeploymentKey: proto.String(deletion.String()),
 					ChangeType:    ftlv1.DeploymentChangeType_DEPLOYMENT_REMOVED,
 					ModuleRemoved: moduleRemoved,
 				}
@@ -1571,7 +1571,7 @@ func (s *Service) watchModuleChanges(ctx context.Context, sendChange func(respon
 						}
 						response = &ftlv1.PullSchemaResponse{
 							ModuleName:    moduleSchema.Name,
-							DeploymentKey: message.Key.String(),
+							DeploymentKey: proto.String(message.Key.String()),
 							Schema:        moduleSchema,
 							ChangeType:    changeType,
 							ModuleRemoved: moduleRemoved,
@@ -1581,7 +1581,7 @@ func (s *Service) watchModuleChanges(ctx context.Context, sendChange func(respon
 					mostRecentDeploymentByModule[message.Schema.Name] = message.Key.String()
 					response = &ftlv1.PullSchemaResponse{
 						ModuleName:    moduleSchema.Name,
-						DeploymentKey: message.Key.String(),
+						DeploymentKey: proto.String(message.Key.String()),
 						Schema:        moduleSchema,
 						ChangeType:    ftlv1.DeploymentChangeType_DEPLOYMENT_ADDED,
 						More:          initialCount > 1,

backend/controller/scaling/k8sscaling/deployment_provisioner.go

@@ -39,6 +39,7 @@ import (
 	ftlv1 "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1"
 	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
 	"github.com/TBD54566975/ftl/internal/log"
+	"github.com/TBD54566975/ftl/internal/model"
 )
 
 const thisDeploymentName = "ftl-controller"
@@ -54,7 +55,7 @@ type DeploymentProvisioner struct {
 	MyDeploymentName string
 	Namespace        string
 	// Map of known deployments
-	KnownDeployments *xsync.Map
+	KnownDeployments *xsync.MapOf[string, bool]
 	FTLEndpoint      string
 	IstioSecurity    optional.Option[istioclient.Clientset]
 }
@@ -106,22 +107,26 @@ func (r *DeploymentProvisioner) handleSchemaChange(ctx context.Context, msg *ftl
 	if !msg.More {
 		defer r.deleteMissingDeployments(ctx)
 	}
-	if msg.DeploymentKey == "" {
+	if msg.DeploymentKey == nil {
 		// Builtins don't have deployments
 		return nil
 	}
 	logger := log.FromContext(ctx)
 	logger = logger.Module(msg.ModuleName)
 	ctx = log.ContextWithLogger(ctx, logger)
-	logger.Debugf("Handling schema change for %s", msg.DeploymentKey)
+	deploymentKey, err := model.ParseDeploymentKey(msg.GetDeploymentKey())
+	if err != nil {
+		return fmt.Errorf("failed to parse deployment key %s: %w", msg.GetDeploymentKey(), err)
+	}
+	logger.Debugf("Handling schema change for %s", deploymentKey)
 	deploymentClient := r.Client.AppsV1().Deployments(r.Namespace)
-	deployment, err := deploymentClient.Get(ctx, msg.DeploymentKey, v1.GetOptions{})
+	deployment, err := deploymentClient.Get(ctx, deploymentKey.String(), v1.GetOptions{})
 	deploymentExists := true
 	if err != nil {
 		if errors.IsNotFound(err) {
 			deploymentExists = false
 		} else {
-			return fmt.Errorf("failed to get deployment %s: %w", msg.DeploymentKey, err)
+			return fmt.Errorf("failed to get deployment %s: %w", deploymentKey, err)
 		}
 	}
 
@@ -131,12 +136,12 @@ func (r *DeploymentProvisioner) handleSchemaChange(ctx context.Context, msg *ftl
 		// Note that a change is now currently usually and add and a delete
 		// As it should really be called a module changed, not a deployment changed
 		// This will need to be fixed as part of the support for rolling deployments
-		r.KnownDeployments.Store(msg.DeploymentKey, true)
+		r.KnownDeployments.Store(deploymentKey.String(), true)
 		if deploymentExists {
-			logger.Debugf("Updating deployment %s", msg.DeploymentKey)
+			logger.Debugf("Updating deployment %s", deploymentKey)
 			return r.handleExistingDeployment(ctx, deployment, msg.Schema)
 		} else {
-			return r.handleNewDeployment(ctx, msg.Schema, msg.DeploymentKey)
+			return r.handleNewDeployment(ctx, msg.Schema, deploymentKey.String())
 		}
 	case ftlv1.DeploymentChangeType_DEPLOYMENT_REMOVED:
 		if deploymentExists {
@@ -145,9 +150,9 @@ func (r *DeploymentProvisioner) handleSchemaChange(ctx context.Context, msg *ftl
 				// Nasty hack, we want all the controllers to have updated their route tables before we kill the runner
 				// so we add a slight delay here
 				time.Sleep(time.Second * 10)
-				r.KnownDeployments.Delete(msg.DeploymentKey)
+				r.KnownDeployments.Delete(deploymentKey.String())
 				logger.Debugf("Deleting service %s", msg.ModuleName)
-				err = r.Client.CoreV1().Services(r.Namespace).Delete(ctx, msg.DeploymentKey, v1.DeleteOptions{})
+				err = r.Client.CoreV1().Services(r.Namespace).Delete(ctx, deploymentKey.String(), v1.DeleteOptions{})
 				if err != nil {
 					if !errors.IsNotFound(err) {
 						logger.Errorf(err, "Failed to delete service %s", msg.ModuleName)

backend/controller/scaling/k8sscaling/k8s_scaling.go

@@ -61,7 +61,7 @@ func (k k8sScaling) Start(ctx context.Context, controller url.URL, leaser leases
 	deploymentReconciler := &DeploymentProvisioner{
 		Client:           clientset,
 		Namespace:        namespace,
-		KnownDeployments: xsync.NewMap(),
+		KnownDeployments: xsync.NewMapOf[string, bool](),
 		FTLEndpoint:      controller.String(),
 		IstioSecurity:    optional.Ptr(sec),
 	}

backend/controller/scaling/localscaling/local_scaling.go

@@ -50,8 +50,9 @@ type localScaling struct {
 }
 
 type devModeRunner struct {
-	uri           url.URL
-	deploymentKey string
+	uri url.URL
+	// Set to None under mysterious circumstances...
+	deploymentKey optional.Option[model.DeploymentKey]
 	debugPort     int
 }
 
@@ -113,7 +114,7 @@ type deploymentInfo struct {
 	runner   optional.Option[runnerInfo]
 	module   string
 	replicas int32
-	key      string
+	key      model.DeploymentKey
 	language string
 	exits    int
 }
@@ -149,32 +150,36 @@ func NewLocalScaling(portAllocator *bind.BindAllocator, controllerAddresses []*u
 }
 
 func (l *localScaling) handleSchemaChange(ctx context.Context, msg *ftlv1.PullSchemaResponse) error {
-	if msg.DeploymentKey == "" {
+	if msg.DeploymentKey == nil {
 		// Builtins don't have deployments
 		return nil
 	}
+	deploymentKey, err := model.ParseDeploymentKey(msg.GetDeploymentKey())
+	if err != nil {
+		return fmt.Errorf("failed to parse deployment key: %w", err)
+	}
 	l.lock.Lock()
 	defer l.lock.Unlock()
 	logger := log.FromContext(ctx).Scope("localScaling").Module(msg.ModuleName)
 	ctx = log.ContextWithLogger(ctx, logger)
-	logger.Debugf("Handling schema change for %s", msg.DeploymentKey)
+	logger.Debugf("Handling schema change for %s", deploymentKey)
 	moduleDeployments := l.runners[msg.ModuleName]
 	if moduleDeployments == nil {
 		moduleDeployments = map[string]*deploymentInfo{}
 		l.runners[msg.ModuleName] = moduleDeployments
 	}
-	deploymentRunners := moduleDeployments[msg.DeploymentKey]
+	deploymentRunners := moduleDeployments[deploymentKey.String()]
 	if deploymentRunners == nil {
-		deploymentRunners = &deploymentInfo{runner: optional.None[runnerInfo](), key: msg.DeploymentKey, module: msg.ModuleName, language: msg.Schema.Runtime.Language}
-		moduleDeployments[msg.DeploymentKey] = deploymentRunners
+		deploymentRunners = &deploymentInfo{runner: optional.None[runnerInfo](), key: deploymentKey, module: msg.ModuleName, language: msg.Schema.Runtime.Language}
+		moduleDeployments[deploymentKey.String()] = deploymentRunners
 	}
 
 	switch msg.ChangeType {
 	case ftlv1.DeploymentChangeType_DEPLOYMENT_ADDED, ftlv1.DeploymentChangeType_DEPLOYMENT_CHANGED:
 		deploymentRunners.replicas = msg.Schema.Runtime.MinReplicas
 	case ftlv1.DeploymentChangeType_DEPLOYMENT_REMOVED:
 		deploymentRunners.replicas = 0
-		delete(moduleDeployments, msg.DeploymentKey)
+		delete(moduleDeployments, deploymentKey.String())
 	}
 	return l.reconcileRunners(ctx, deploymentRunners)
 }
@@ -203,7 +208,7 @@ func (l *localScaling) reconcileRunners(ctx context.Context, deploymentRunners *
 	return nil
 }
 
-func (l *localScaling) startRunner(ctx context.Context, deploymentKey string, info *deploymentInfo) error {
+func (l *localScaling) startRunner(ctx context.Context, deploymentKey model.DeploymentKey, info *deploymentInfo) error {
 	select {
 	case <-ctx.Done():
 		// In some cases this gets called with an expired context, generally after the lease is released
@@ -217,11 +222,11 @@ func (l *localScaling) startRunner(ctx context.Context, deploymentKey string, in
 	debugPort := 0
 	if devEndpoint != nil {
 		devURI = optional.Some(devEndpoint.uri)
-		if devEndpoint.deploymentKey == deploymentKey {
+		if devKey, ok := devEndpoint.deploymentKey.Get(); ok && devKey.Equal(deploymentKey) {
 			// Already running, don't start another
 			return nil
 		}
-		devEndpoint.deploymentKey = deploymentKey
+		devEndpoint.deploymentKey = optional.Some(deploymentKey)
 		debugPort = devEndpoint.debugPort
 	} else if ide, ok := l.ideSupport.Get(); ok {
 		var debug *localdebug.DebugInfo
@@ -282,7 +287,7 @@ func (l *localScaling) startRunner(ctx context.Context, deploymentKey string, in
 		l.lock.Lock()
 		defer l.lock.Unlock()
 		if devEndpoint != nil {
-			devEndpoint.deploymentKey = ""
+			devEndpoint.deploymentKey = optional.None[model.DeploymentKey]()
 		}
 		// Don't count context.Canceled as an a restart error
 		if err != nil && !errors.Is(err, context.Canceled) {

backend/cron/service.go

@@ -171,7 +171,7 @@ func updateCronJobs(ctx context.Context, cronJobs map[string][]cronJob, resp *ft
 		// We see the new state of the module before we see the removed deployment.
 		// We only want to actually remove if it was not replaced by a new deployment.
 		if !resp.ModuleRemoved {
-			logger.Debugf("Not removing cron jobs for %s as module is still present", resp.DeploymentKey)
+			logger.Debugf("Not removing cron jobs for %s as module is still present", resp.GetDeploymentKey())
 			return nil
 		}
 		logger.Debugf("Removing cron jobs for module %s", resp.ModuleName)

backend/ingress/service.go

@@ -103,7 +103,7 @@ func Start(ctx context.Context, config Config, pullSchemaClient PullSchemaClient
 				// We see the new state of the module before we see the removed deployment.
 				// We only want to actually remove if it was not replaced by a new deployment.
 				if !resp.ModuleRemoved {
-					logger.Debugf("Not removing ingress for %s as it is not the current deployment", resp.DeploymentKey)
+					logger.Debugf("Not removing ingress for %s as it is not the current deployment", resp.GetDeploymentKey())
 					return nil
 				}
 				for i := range existing.Modules {