Configure alternate backend for Dapr workflow (dapr#7283)

* Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Update pkg/runtime/runtime.go Co-authored-by: Chris Gillum <[email protected]> Signed-off-by: MD Ashique <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: ashiquemd <[email protected]> * Configurable workflow backend Signed-off-by: MD Ashique <[email protected]> * Adding e2e tests for sqlite Signed-off-by: MD Ashique <[email protected]> * Create workflow backend component Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * fix unit tests Signed-off-by: MD Ashique <[email protected]> * perf test build issue Signed-off-by: MD Ashique <[email protected]> * Add perf test for sqlite backend Signed-off-by: MD Ashique <[email protected]> * Moving component-contrib changes to dapr/dapr Signed-off-by: MD Ashique <[email protected]> * Moving component-contrib changes to dapr/dapr Signed-off-by: MD Ashique <[email protected]> * Initialize dtf-go backen in the dtf-go library Signed-off-by: MD Ashique <[email protected]> * Initialize dtf-go backen in the dtf-go library Signed-off-by: MD Ashique <[email protected]> * Initialize dtf-go backen in the dtf-go library Signed-off-by: MD Ashique <[email protected]> * Initialize dtf-go backend in dapr itself Signed-off-by: MD Ashique <[email protected]> * remove visual studio solution file Signed-off-by: MD Ashique <[email protected]> * remove visual studio solution file Signed-off-by: MD Ashique <[email protected]> * rename wbe to wfbe Signed-off-by: MD Ashique <[email protected]> * renaming backend file to actor_backend Signed-off-by: MD Ashique <[email protected]> * fix link error Signed-off-by: MD Ashique <[email protected]> * Update pkg/runtime/wfengine/wfengine_backend_test.go Co-authored-by: Chris Gillum <[email protected]> Signed-off-by: MD Ashique <[email protected]> * Add workflow backend Signed-off-by: MD Ashique <[email protected]> * Fixed workflow backend ready issue Signed-off-by: MD Ashique <[email protected]> * modifying perf test to run only for one backed at a time, by default run actor backend Signed-off-by: MD Ashique <[email protected]> * modifying perf test to run only for one backed at a time, by default run actor backend Signed-off-by: MD Ashique <[email protected]> * Added unit test Signed-off-by: MD Ashique <[email protected]> * Added unit test Signed-off-by: MD Ashique <[email protected]> * Added unit test Signed-off-by: MD Ashique <[email protected]> * Added unit test Signed-off-by: MD Ashique <[email protected]> * moving sqlite to its own component file Signed-off-by: MD Ashique <[email protected]> * add map structure for sqlite options Signed-off-by: MD Ashique <[email protected]> * add map structure for sqlite options Signed-off-by: MD Ashique <[email protected]> * Implemented workflow backend drop in Signed-off-by: MD Ashique <[email protected]> * fixed lint error Signed-off-by: MD Ashique <[email protected]> * Update cmd/daprd/components/wfbackend_actor.go Co-authored-by: Alessandro (Ale) Segala <[email protected]> Signed-off-by: MD Ashique <[email protected]> * Update pkg/runtime/wfengine/sqlite_backend.go Co-authored-by: Alessandro (Ale) Segala <[email protected]> Signed-off-by: MD Ashique <[email protected]> * Update pkg/runtime/wfengine/sqlite_backend.go Co-authored-by: Alessandro (Ale) Segala <[email protected]> Signed-off-by: MD Ashique <[email protected]> * fixed review comments Signed-off-by: MD Ashique <[email protected]> * fixed review comments Signed-off-by: MD Ashique <[email protected]> * fixed review comments Signed-off-by: MD Ashique <[email protected]> * fixed unit tests Signed-off-by: MD Ashique <[email protected]> * Update pkg/components/wfbackend/metadata.go Co-authored-by: Alessandro (Ale) Segala <[email protected]> Signed-off-by: MD Ashique <[email protected]> * Update pkg/components/wfbackend/registry.go Co-authored-by: Alessandro (Ale) Segala <[email protected]> Signed-off-by: MD Ashique <[email protected]> * Remove space from log messsages Signed-off-by: MD Ashique <[email protected]> * return error on backend component parsing failure Signed-off-by: MD Ashique <[email protected]> * WIP: Ensure backends can be loaded via drop-in Signed-off-by: ItalyPaleAle <[email protected]> * Various fixes Signed-off-by: ItalyPaleAle <[email protected]> * Various fixes Signed-off-by: ItalyPaleAle <[email protected]> * removing duplicate actors variable Signed-off-by: MD Ashique <[email protected]> * fix merge conflict Signed-off-by: MD Ashique <[email protected]> * fix merge conflict Signed-off-by: MD Ashique <[email protected]> * commenting monitor test to check if thats creating issue with e2e test Signed-off-by: MD Ashique <[email protected]> * commenting monitor test to check if thats creating issue with e2e test Signed-off-by: MD Ashique <[email protected]> * run only sqlite test Signed-off-by: MD Ashique <[email protected]> * fix wf backend test Signed-off-by: MD Ashique <[email protected]> * Update Dockerfile Signed-off-by: MD Ashique <[email protected]> * making sqlite backend only available for unit/e2e/integration/perf tests and local development Signed-off-by: MD Ashique <[email protected]> * making sqlite backend only available for unit/e2e/integration/perf tests and local development Signed-off-by: MD Ashique <[email protected]> * making sqlite backend only available for unit/e2e/integration/perf tests and local development Signed-off-by: MD Ashique <[email protected]> * fix merge conflict Signed-off-by: MD Ashique <[email protected]> * Change build tag to wfbackendsqlite Signed-off-by: MD Ashique <[email protected]> * removing DAPR_GO_BUILD_TAGS=wfbackendsqlite as it will come from https://github.com/dapr/dapr/pull/7373/files Signed-off-by: MD Ashique <[email protected]> --------- Signed-off-by: ashiquemd <[email protected]> Signed-off-by: MD Ashique <[email protected]> Signed-off-by: ItalyPaleAle <[email protected]> Co-authored-by: Chris Gillum <[email protected]> Co-authored-by: Alessandro (Ale) Segala <[email protected]> Co-authored-by: Mukundan Sundararajan <[email protected]>
Glepooek · Jan 15, 2024 · a19902a · a19902a
1 parent 51dc3a1
commit a19902a
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Showing 38 changed files with 1,060 additions and 357 deletions.
diff --git a/.github/workflows/kind-e2e.yaml b/.github/workflows/kind-e2e.yaml
@@ -57,6 +57,7 @@ jobs:
       # Container registry where to cache e2e test images
       DAPR_CACHE_REGISTRY: "dapre2eacr.azurecr.io"
       PULL_POLICY: IfNotPresent
+      DAPR_GO_BUILD_TAGS: wfbackendsqlite
     strategy:
       fail-fast: false # Keep running if one leg fails.
       matrix:

diff --git a/cmd/daprd/app/app.go b/cmd/daprd/app/app.go
@@ -34,6 +34,7 @@ import (
 	pubsubLoader "github.com/dapr/dapr/pkg/components/pubsub"
 	secretstoresLoader "github.com/dapr/dapr/pkg/components/secretstores"
 	stateLoader "github.com/dapr/dapr/pkg/components/state"
+	wfbeLoader "github.com/dapr/dapr/pkg/components/wfbackend"
 	workflowsLoader "github.com/dapr/dapr/pkg/components/workflows"
 	"github.com/dapr/dapr/pkg/modes"
 	"github.com/dapr/dapr/pkg/runtime/registry"
@@ -92,6 +93,7 @@ func Run() {
 	nrLoader.DefaultRegistry.Logger = logContrib
 	bindingsLoader.DefaultRegistry.Logger = logContrib
 	workflowsLoader.DefaultRegistry.Logger = logContrib
+	wfbeLoader.DefaultRegistry.Logger = logContrib
 	httpMiddlewareLoader.DefaultRegistry.Logger = log // Note this uses log on purpose
 
 	reg := registry.NewOptions().
@@ -104,7 +106,8 @@ func Run() {
 		WithBindings(bindingsLoader.DefaultRegistry).
 		WithCryptoProviders(cryptoLoader.DefaultRegistry).
 		WithHTTPMiddlewares(httpMiddlewareLoader.DefaultRegistry).
-		WithWorkflows(workflowsLoader.DefaultRegistry)
+		WithWorkflows(workflowsLoader.DefaultRegistry).
+		WithWorkflowBackends(wfbeLoader.DefaultRegistry)
 
 	ctx := signals.Context()
 	secProvider, err := security.New(ctx, security.Options{

diff --git a/cmd/daprd/components/wfbackend_actors.go b/cmd/daprd/components/wfbackend_actors.go
@@ -0,0 +1,27 @@
+//go:build allcomponents || stablecomponents
+
+/*
+Copyright 2023 The Dapr Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package components
+
+import (
+	wfbeLoader "github.com/dapr/dapr/pkg/components/wfbackend"
+	"github.com/dapr/dapr/pkg/runtime/wfengine/backends/actors"
+)
+
+func init() {
+	// Note that the actors backend is always enabled, even if this file is deleted
+	// This component is still registered here to allow users to explicitly instantiate the actors backend
+	wfbeLoader.DefaultRegistry.RegisterComponent(actors.NewActorBackend, "actor", "actors")
+}
diff --git a/cmd/daprd/components/wfbackend_sqlite.go b/cmd/daprd/components/wfbackend_sqlite.go
@@ -0,0 +1,25 @@
+//go:build wfbackendsqlite
+
+/*
+Copyright 2023 The Dapr Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package components
+
+import (
+	wfbeLoader "github.com/dapr/dapr/pkg/components/wfbackend"
+	"github.com/dapr/dapr/pkg/runtime/wfengine/backends/sqlite"
+)
+
+func init() {
+	wfbeLoader.DefaultRegistry.RegisterComponent(sqlite.NewSQLiteBackend, "sqlite")
+}
diff --git a/pkg/api/http/http_test.go b/pkg/api/http/http_test.go
@@ -64,6 +64,7 @@ import (
 	"github.com/dapr/dapr/pkg/runtime/channels"
 	"github.com/dapr/dapr/pkg/runtime/compstore"
 	runtimePubsub "github.com/dapr/dapr/pkg/runtime/pubsub"
+	"github.com/dapr/dapr/pkg/runtime/wfengine"
 	daprt "github.com/dapr/dapr/pkg/testing"
 	testtrace "github.com/dapr/dapr/pkg/testing/trace"
 	"github.com/dapr/dapr/utils"
@@ -2649,11 +2650,17 @@ func TestV1Beta1Workflow(t *testing.T) {
 	resiliencyConfig := resiliency.FromConfigurations(logger.NewLogger("workflow.test"), testResiliency)
 	compStore := compstore.New()
 	compStore.AddWorkflow(componentName, fakeWorkflowComponent)
+
+	spec := config.WorkflowSpec{MaxConcurrentWorkflowInvocations: 100, MaxConcurrentActivityInvocations: 100}
+	wfengine := wfengine.NewWorkflowEngine("testAppID", spec, nil)
+	wfengine.SetWorkflowEngineReadyDone()
+
 	testAPI := &api{
 		universal: universal.New(universal.Options{
-			Logger:     logger.NewLogger("fakeLogger"),
-			CompStore:  compStore,
-			Resiliency: resiliencyConfig,
+			Logger:         logger.NewLogger("fakeLogger"),
+			CompStore:      compStore,
+			Resiliency:     resiliencyConfig,
+			WorkflowEngine: wfengine,
 		}),
 	}
 	testAPI.universal.SetActorsInitDone()

diff --git a/pkg/api/universal/universal.go b/pkg/api/universal/universal.go
@@ -23,6 +23,7 @@ import (
 	"github.com/dapr/dapr/pkg/config"
 	"github.com/dapr/dapr/pkg/resiliency"
 	"github.com/dapr/dapr/pkg/runtime/compstore"
+	"github.com/dapr/dapr/pkg/runtime/wfengine"
 	"github.com/dapr/kit/logger"
 )
 
@@ -37,6 +38,7 @@ type Options struct {
 	ExtendedMetadata            map[string]string
 	AppConnectionConfig         config.AppConnectionConfig
 	GlobalConfig                *config.Configuration
+	WorkflowEngine              *wfengine.WorkflowEngine
 }
 
 // Universal contains the implementation of gRPC APIs that are also used by the HTTP server.
@@ -51,6 +53,7 @@ type Universal struct {
 	extendedMetadata            map[string]string
 	appConnectionConfig         config.AppConnectionConfig
 	globalConfig                *config.Configuration
+	workflowEngine              *wfengine.WorkflowEngine
 
 	extendedMetadataLock sync.RWMutex
 	actorsLock           sync.RWMutex
@@ -70,6 +73,7 @@ func New(opts Options) *Universal {
 		extendedMetadata:            opts.ExtendedMetadata,
 		appConnectionConfig:         opts.AppConnectionConfig,
 		globalConfig:                opts.GlobalConfig,
+		workflowEngine:              opts.WorkflowEngine,
 		actorsReadyCh:               make(chan struct{}),
 	}
 }

diff --git a/pkg/api/universal/workflow.go b/pkg/api/universal/workflow.go
@@ -34,8 +34,7 @@ func (a *Universal) GetWorkflowBeta1(ctx context.Context, in *runtimev1pb.GetWor
 		return &runtimev1pb.GetWorkflowResponse{}, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {
@@ -81,8 +80,7 @@ func (a *Universal) StartWorkflowBeta1(ctx context.Context, in *runtimev1pb.Star
 		return &runtimev1pb.StartWorkflowResponse{}, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {
@@ -117,8 +115,7 @@ func (a *Universal) TerminateWorkflowBeta1(ctx context.Context, in *runtimev1pb.
 		return emptyResponse, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {
@@ -155,8 +152,7 @@ func (a *Universal) RaiseEventWorkflowBeta1(ctx context.Context, in *runtimev1pb
 		return emptyResponse, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {
@@ -187,8 +183,7 @@ func (a *Universal) PauseWorkflowBeta1(ctx context.Context, in *runtimev1pb.Paus
 		return emptyResponse, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {
@@ -215,8 +210,7 @@ func (a *Universal) ResumeWorkflowBeta1(ctx context.Context, in *runtimev1pb.Res
 		return emptyResponse, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {
@@ -243,8 +237,7 @@ func (a *Universal) PurgeWorkflowBeta1(ctx context.Context, in *runtimev1pb.Purg
 		return emptyResponse, err
 	}
 
-	// Workflow requires actors to be ready
-	a.WaitForActorsReady(ctx)
+	a.workflowEngine.WaitForWorkflowEngineReady(ctx)
 
 	workflowComponent, err := a.getWorkflowComponent(in.GetWorkflowComponent())
 	if err != nil {

diff --git a/pkg/api/universal/workflow_test.go b/pkg/api/universal/workflow_test.go
@@ -20,10 +20,12 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/dapr/components-contrib/workflows"
+	"github.com/dapr/dapr/pkg/config"
 	"github.com/dapr/dapr/pkg/messages"
 	runtimev1pb "github.com/dapr/dapr/pkg/proto/runtime/v1"
 	"github.com/dapr/dapr/pkg/resiliency"
 	"github.com/dapr/dapr/pkg/runtime/compstore"
+	"github.com/dapr/dapr/pkg/runtime/wfengine"
 	daprt "github.com/dapr/dapr/pkg/testing"
 	"github.com/dapr/kit/logger"
 )
@@ -111,10 +113,11 @@ func TestStartWorkflowBeta1API(t *testing.T) {
 
 	// Setup universal dapr API
 	fakeAPI := &Universal{
-		logger:        logger.NewLogger("test"),
-		resiliency:    resiliency.New(nil),
-		compStore:     compStore,
-		actorsReadyCh: make(chan struct{}),
+		logger:         logger.NewLogger("test"),
+		resiliency:     resiliency.New(nil),
+		compStore:      compStore,
+		actorsReadyCh:  make(chan struct{}),
+		workflowEngine: getWorkflowEngine(),
 	}
 	fakeAPI.SetActorsInitDone()
 
@@ -185,10 +188,11 @@ func TestGetWorkflowBeta1API(t *testing.T) {
 
 	// Setup universal dapr API
 	fakeAPI := &Universal{
-		logger:        logger.NewLogger("test"),
-		resiliency:    resiliency.New(nil),
-		compStore:     compStore,
-		actorsReadyCh: make(chan struct{}),
+		logger:         logger.NewLogger("test"),
+		resiliency:     resiliency.New(nil),
+		compStore:      compStore,
+		actorsReadyCh:  make(chan struct{}),
+		workflowEngine: getWorkflowEngine(),
 	}
 	fakeAPI.SetActorsInitDone()
 
@@ -258,10 +262,11 @@ func TestTerminateWorkflowBeta1API(t *testing.T) {
 
 	// Setup universal dapr API
 	fakeAPI := &Universal{
-		logger:        logger.NewLogger("test"),
-		resiliency:    resiliency.New(nil),
-		compStore:     compStore,
-		actorsReadyCh: make(chan struct{}),
+		logger:         logger.NewLogger("test"),
+		resiliency:     resiliency.New(nil),
+		compStore:      compStore,
+		actorsReadyCh:  make(chan struct{}),
+		workflowEngine: getWorkflowEngine(),
 	}
 	fakeAPI.SetActorsInitDone()
 
@@ -346,10 +351,11 @@ func TestRaiseEventWorkflowBeta1Api(t *testing.T) {
 
 	// Setup universal dapr API
 	fakeAPI := &Universal{
-		logger:        logger.NewLogger("test"),
-		resiliency:    resiliency.New(nil),
-		compStore:     compStore,
-		actorsReadyCh: make(chan struct{}),
+		logger:         logger.NewLogger("test"),
+		resiliency:     resiliency.New(nil),
+		compStore:      compStore,
+		actorsReadyCh:  make(chan struct{}),
+		workflowEngine: getWorkflowEngine(),
 	}
 	fakeAPI.SetActorsInitDone()
 
@@ -421,10 +427,11 @@ func TestPauseWorkflowBeta1Api(t *testing.T) {
 
 	// Setup universal dapr API
 	fakeAPI := &Universal{
-		logger:        logger.NewLogger("test"),
-		resiliency:    resiliency.New(nil),
-		compStore:     compStore,
-		actorsReadyCh: make(chan struct{}),
+		logger:         logger.NewLogger("test"),
+		resiliency:     resiliency.New(nil),
+		compStore:      compStore,
+		actorsReadyCh:  make(chan struct{}),
+		workflowEngine: getWorkflowEngine(),
 	}
 	fakeAPI.SetActorsInitDone()
 
@@ -494,10 +501,11 @@ func TestResumeWorkflowBeta1Api(t *testing.T) {
 
 	// Setup universal dapr API
 	fakeAPI := &Universal{
-		logger:        logger.NewLogger("test"),
-		resiliency:    resiliency.New(nil),
-		compStore:     compStore,
-		actorsReadyCh: make(chan struct{}),
+		logger:         logger.NewLogger("test"),
+		resiliency:     resiliency.New(nil),
+		compStore:      compStore,
+		actorsReadyCh:  make(chan struct{}),
+		workflowEngine: getWorkflowEngine(),
 	}
 	fakeAPI.SetActorsInitDone()
 
@@ -517,3 +525,10 @@ func TestResumeWorkflowBeta1Api(t *testing.T) {
 		})
 	}
 }
+
+func getWorkflowEngine() *wfengine.WorkflowEngine {
+	spec := config.WorkflowSpec{MaxConcurrentWorkflowInvocations: 100, MaxConcurrentActivityInvocations: 100}
+	wfengine := wfengine.NewWorkflowEngine("testAppID", spec, nil)
+	wfengine.SetWorkflowEngineReadyDone()
+	return wfengine
+}
diff --git a/pkg/components/category.go b/pkg/components/category.go
@@ -17,14 +17,15 @@ type Category string
 
 // supported components category
 const (
-	CategoryBindings       Category = "bindings"
-	CategoryPubSub         Category = "pubsub"
-	CategorySecretStore    Category = "secretstores"
-	CategoryStateStore     Category = "state"
-	CategoryWorkflow       Category = "workflow"
-	CategoryMiddleware     Category = "middleware"
-	CategoryConfiguration  Category = "configuration"
-	CategoryCryptoProvider Category = "crypto"
-	CategoryLock           Category = "lock"
-	CategoryNameResolution Category = "nameresolution"
+	CategoryBindings        Category = "bindings"
+	CategoryPubSub          Category = "pubsub"
+	CategorySecretStore     Category = "secretstores"
+	CategoryStateStore      Category = "state"
+	CategoryWorkflow        Category = "workflow"
+	CategoryWorkflowBackend Category = "workflowbackend"
+	CategoryMiddleware      Category = "middleware"
+	CategoryConfiguration   Category = "configuration"
+	CategoryCryptoProvider  Category = "crypto"
+	CategoryLock            Category = "lock"
+	CategoryNameResolution  Category = "nameresolution"
 )
diff --git a/pkg/components/wfbackend/metadata.go b/pkg/components/wfbackend/metadata.go
@@ -0,0 +1,26 @@
+/*
+Copyright 2023 The Dapr Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package wfbackend
+
+import (
+	"github.com/dapr/components-contrib/metadata"
+)
+
+// Metadata represents a set of properties specific for workflow backends.
+type Metadata struct {
+	metadata.Base `json:",inline"`
+
+	// Dapr app ID
+	AppID string
+}