[Events] This PR introduces the Trigger Service for Event Consumption + Some Minor improvements (#419)

cli/server/config.go

@@ -13,6 +13,7 @@ import (
 	"github.com/harness/gitness/events"
 	"github.com/harness/gitness/gitrpc"
 	"github.com/harness/gitness/gitrpc/server"
+	"github.com/harness/gitness/internal/services/trigger"
 	"github.com/harness/gitness/internal/services/webhook"
 	"github.com/harness/gitness/lock"
 	"github.com/harness/gitness/store/database"
@@ -147,23 +148,26 @@ func ProvideEventsConfig() (events.Config, error) {
 	return config, nil
 }
 
-// ProvideWebhookConfig loads the webhook config from the environment.
-// It backfills certain config elements if required.
-func ProvideWebhookConfig() (webhook.Config, error) {
-	config := webhook.Config{}
-	err := envconfig.Process("", &config)
-	if err != nil {
-		return webhook.Config{}, fmt.Errorf("failed to load events config: %w", err)
+// ProvideWebhookConfig loads the webhook service config from the main config.
+func ProvideWebhookConfig(config *types.Config) webhook.Config {
+	return webhook.Config{
+		UserAgentIdentity:   config.Webhook.UserAgentIdentity,
+		HeaderIdentity:      config.Webhook.HeaderIdentity,
+		EventReaderName:     config.InstanceID,
+		Concurrency:         config.Webhook.Concurrency,
+		MaxRetries:          config.Webhook.MaxRetries,
+		AllowPrivateNetwork: config.Webhook.AllowPrivateNetwork,
+		AllowLoopback:       config.Webhook.AllowLoopback,
 	}
+}
 
-	if config.EventReaderName == "" {
-		config.EventReaderName, err = getSanitizedMachineName()
-		if err != nil {
-			return webhook.Config{}, fmt.Errorf("failed to get sanitized machine name: %w", err)
-		}
+// ProvideTriggerConfig loads the trigger service config from the main config.
+func ProvideTriggerConfig(config *types.Config) trigger.Config {
+	return trigger.Config{
+		EventReaderName: config.InstanceID,
+		Concurrency:     config.Webhook.Concurrency,
+		MaxRetries:      config.Webhook.MaxRetries,
 	}
-
-	return config, nil
 }
 
 // ProvideLockConfig generates the `lock` package config from the gitness config.

cmd/gitness/wire.go

@@ -32,7 +32,7 @@ import (
 	"github.com/harness/gitness/internal/api/controller/space"
 	"github.com/harness/gitness/internal/api/controller/system"
 	"github.com/harness/gitness/internal/api/controller/template"
-	"github.com/harness/gitness/internal/api/controller/trigger"
+	controllertrigger "github.com/harness/gitness/internal/api/controller/trigger"
 	"github.com/harness/gitness/internal/api/controller/user"
 	controllerwebhook "github.com/harness/gitness/internal/api/controller/webhook"
 	"github.com/harness/gitness/internal/auth/authn"
@@ -54,6 +54,7 @@ import (
 	"github.com/harness/gitness/internal/services/importer"
 	"github.com/harness/gitness/internal/services/job"
 	pullreqservice "github.com/harness/gitness/internal/services/pullreq"
+	"github.com/harness/gitness/internal/services/trigger"
 	"github.com/harness/gitness/internal/services/webhook"
 	"github.com/harness/gitness/internal/store"
 	"github.com/harness/gitness/internal/store/cache"
@@ -106,6 +107,8 @@ func initSystem(ctx context.Context, config *types.Config) (*cliserver.System, e
 		events.WireSet,
 		cliserver.ProvideWebhookConfig,
 		webhook.WireSet,
+		cliserver.ProvideTriggerConfig,
+		trigger.WireSet,
 		githook.WireSet,
 		cliserver.ProvideLockConfig,
 		lock.WireSet,
@@ -129,7 +132,7 @@ func initSystem(ctx context.Context, config *types.Config) (*cliserver.System, e
 		eventsstream.WireSet,
 		scheduler.WireSet,
 		commit.WireSet,
-		trigger.WireSet,
+		controllertrigger.WireSet,
 		plugin.WireSet,
 		importer.WireSet,
 	)

cmd/gitness/wire_gen.go

@@ -52,6 +52,7 @@ import (
 	"github.com/harness/gitness/internal/services/importer"
 	"github.com/harness/gitness/internal/services/job"
 	pullreq2 "github.com/harness/gitness/internal/services/pullreq"
+	trigger2 "github.com/harness/gitness/internal/services/trigger"
 	"github.com/harness/gitness/internal/services/webhook"
 	"github.com/harness/gitness/internal/store"
 	"github.com/harness/gitness/internal/store/cache"
@@ -174,10 +175,7 @@ func initSystem(ctx context.Context, config *types.Config) (*server.System, erro
 	}
 	migrator := codecomments.ProvideMigrator(gitrpcInterface)
 	pullreqController := pullreq.ProvideController(db, provider, authorizer, pullReqStore, pullReqActivityStore, codeCommentView, pullReqReviewStore, pullReqReviewerStore, repoStore, principalStore, gitrpcInterface, reporter, mutexManager, migrator)
-	webhookConfig, err := server.ProvideWebhookConfig()
-	if err != nil {
-		return nil, err
-	}
+	webhookConfig := server.ProvideWebhookConfig(config)
 	webhookStore := database.ProvideWebhookStore(db)
 	webhookExecutionStore := database.ProvideWebhookExecutionStore(db)
 	readerFactory, err := events4.ProvideReaderFactory(eventsSystem)
@@ -236,7 +234,12 @@ func initSystem(ctx context.Context, config *types.Config) (*server.System, erro
 	if err != nil {
 		return nil, err
 	}
-	servicesServices := services.ProvideServices(webhookService, pullreqService, executor, jobScheduler)
+	triggerConfig := server.ProvideTriggerConfig(config)
+	triggerService, err := trigger2.ProvideService(ctx, triggerConfig, readerFactory, eventsReaderFactory)
+	if err != nil {
+		return nil, err
+	}
+	servicesServices := services.ProvideServices(webhookService, pullreqService, triggerService, jobScheduler)
 	serverSystem := server.NewSystem(bootstrapBootstrap, serverServer, poller, grpcServer, cronManager, servicesServices)
 	return serverSystem, nil
 }

events/reader.go

@@ -43,9 +43,9 @@ func (f *ReaderFactory[R]) Launch(ctx context.Context,
 
 	// setup ctx with copied logger that has extra fields set
 	log := log.Ctx(ctx).With().
-		Str("events_category", f.category).
-		Str("events_group_name", groupName).
-		Str("events_reader_name", readerName).
+		Str("events.category", f.category).
+		Str("events.group_name", groupName).
+		Str("events.reader_name", readerName).
 		Logger()
 
 	// create new stream consumer using factory method
@@ -191,8 +191,8 @@ func ReaderRegisterEvent[T interface{}](reader *GenericReader,
 
 			// update ctx with event type for proper logging
 			log := log.Ctx(ctx).With().
-				Str("events_type", string(eventType)).
-				Str("events_id", event.ID).
+				Str("events.type", string(eventType)).
+				Str("events.id", event.ID).
 				Logger()
 			ctx = log.WithContext(ctx)
 

internal/services/trigger/handler_branch.go

@@ -0,0 +1,22 @@
+// Copyright 2022 Harness Inc. All rights reserved.
+// Use of this source code is governed by the Polyform Free Trial License
+// that can be found in the LICENSE.md file for this repository.
+
+package trigger
+
+import (
+	"context"
+
+	"github.com/harness/gitness/events"
+	gitevents "github.com/harness/gitness/internal/events/git"
+)
+
+func (s *Service) handleEventBranchCreated(ctx context.Context,
+	event *events.Event[*gitevents.BranchCreatedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}
+
+func (s *Service) handleEventBranchUpdated(ctx context.Context,
+	event *events.Event[*gitevents.BranchUpdatedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}

internal/services/trigger/handler_pullreq.go

@@ -0,0 +1,27 @@
+// Copyright 2022 Harness Inc. All rights reserved.
+// Use of this source code is governed by the Polyform Free Trial License
+// that can be found in the LICENSE.md file for this repository.
+
+package trigger
+
+import (
+	"context"
+
+	"github.com/harness/gitness/events"
+	pullreqevents "github.com/harness/gitness/internal/events/pullreq"
+)
+
+func (s *Service) handleEventPullReqCreated(ctx context.Context,
+	event *events.Event[*pullreqevents.CreatedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}
+
+func (s *Service) handleEventPullReqReopened(ctx context.Context,
+	event *events.Event[*pullreqevents.ReopenedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}
+
+func (s *Service) handleEventPullReqBranchUpdated(ctx context.Context,
+	event *events.Event[*pullreqevents.BranchUpdatedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}

internal/services/trigger/handler_tag.go

@@ -0,0 +1,22 @@
+// Copyright 2022 Harness Inc. All rights reserved.
+// Use of this source code is governed by the Polyform Free Trial License
+// that can be found in the LICENSE.md file for this repository.
+
+package trigger
+
+import (
+	"context"
+
+	"github.com/harness/gitness/events"
+	gitevents "github.com/harness/gitness/internal/events/git"
+)
+
+func (s *Service) handleEventTagCreated(ctx context.Context,
+	event *events.Event[*gitevents.TagCreatedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}
+
+func (s *Service) handleEventTagUpdated(ctx context.Context,
+	event *events.Event[*gitevents.TagUpdatedPayload]) error {
+	return events.NewDiscardEventErrorf("not implemented")
+}

internal/services/trigger/service.go

@@ -0,0 +1,103 @@
+// Copyright 2022 Harness Inc. All rights reserved.
+// Use of this source code is governed by the Polyform Free Trial License
+// that can be found in the LICENSE.md file for this repository.
+
+package trigger
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/harness/gitness/events"
+	gitevents "github.com/harness/gitness/internal/events/git"
+	pullreqevents "github.com/harness/gitness/internal/events/pullreq"
+	"github.com/harness/gitness/stream"
+)
+
+const (
+	eventsReaderGroupName = "gitness:trigger"
+)
+
+type Config struct {
+	EventReaderName string
+	Concurrency     int
+	MaxRetries      int
+}
+
+func (c *Config) Prepare() error {
+	if c == nil {
+		return errors.New("config is required")
+	}
+	if c.EventReaderName == "" {
+		return errors.New("config.EventReaderName is required")
+	}
+	if c.Concurrency < 1 {
+		return errors.New("config.Concurrency has to be a positive number")
+	}
+	if c.MaxRetries < 0 {
+		return errors.New("config.MaxRetries can't be negative")
+	}
+
+	return nil
+}
+
+type Service struct{}
+
+func New(
+	ctx context.Context,
+	config Config,
+	gitReaderFactory *events.ReaderFactory[*gitevents.Reader],
+	pullreqEvReaderFactory *events.ReaderFactory[*pullreqevents.Reader],
+) (*Service, error) {
+	if err := config.Prepare(); err != nil {
+		return nil, fmt.Errorf("provided trigger service config is invalid: %w", err)
+	}
+
+	service := &Service{}
+
+	_, err := gitReaderFactory.Launch(ctx, eventsReaderGroupName, config.EventReaderName,
+		func(r *gitevents.Reader) error {
+			const idleTimeout = 1 * time.Minute
+			r.Configure(
+				stream.WithConcurrency(config.Concurrency),
+				stream.WithHandlerOptions(
+					stream.WithIdleTimeout(idleTimeout),
+					stream.WithMaxRetries(config.MaxRetries),
+				))
+
+			_ = r.RegisterBranchCreated(service.handleEventBranchCreated)
+			_ = r.RegisterBranchUpdated(service.handleEventBranchUpdated)
+
+			_ = r.RegisterTagCreated(service.handleEventTagCreated)
+			_ = r.RegisterTagUpdated(service.handleEventTagUpdated)
+
+			return nil
+		})
+	if err != nil {
+		return nil, fmt.Errorf("failed to launch git events reader: %w", err)
+	}
+
+	_, err = pullreqEvReaderFactory.Launch(ctx, eventsReaderGroupName, config.EventReaderName,
+		func(r *pullreqevents.Reader) error {
+			const idleTimeout = 1 * time.Minute
+			r.Configure(
+				stream.WithConcurrency(config.Concurrency),
+				stream.WithHandlerOptions(
+					stream.WithIdleTimeout(idleTimeout),
+					stream.WithMaxRetries(config.MaxRetries),
+				))
+
+			_ = r.RegisterCreated(service.handleEventPullReqCreated)
+			_ = r.RegisterBranchUpdated(service.handleEventPullReqBranchUpdated)
+			_ = r.RegisterReopened(service.handleEventPullReqReopened)
+
+			return nil
+		})
+	if err != nil {
+		return nil, fmt.Errorf("failed to launch pr events reader: %w", err)
+	}
+
+	return service, nil
+}

internal/services/trigger/wire.go

@@ -0,0 +1,28 @@
+// Copyright 2022 Harness Inc. All rights reserved.
+// Use of this source code is governed by the Polyform Free Trial License
+// that can be found in the LICENSE.md file for this repository.
+
+package trigger
+
+import (
+	"context"
+
+	"github.com/harness/gitness/events"
+	gitevents "github.com/harness/gitness/internal/events/git"
+	pullreqevents "github.com/harness/gitness/internal/events/pullreq"
+
+	"github.com/google/wire"
+)
+
+var WireSet = wire.NewSet(
+	ProvideService,
+)
+
+func ProvideService(
+	ctx context.Context,
+	config Config,
+	gitReaderFactory *events.ReaderFactory[*gitevents.Reader],
+	pullReqEvFactory *events.ReaderFactory[*pullreqevents.Reader],
+) (*Service, error) {
+	return New(ctx, config, gitReaderFactory, pullReqEvFactory)
+}

internal/services/webhook/service.go

@@ -27,17 +27,15 @@ const (
 type Config struct {
 	// UserAgentIdentity specifies the identity used for the user agent header
 	// IMPORTANT: do not include version.
-	UserAgentIdentity string `envconfig:"GITNESS_WEBHOOK_USER_AGENT_IDENTITY" default:"Gitness"`
+	UserAgentIdentity string
 	// HeaderIdentity specifies the identity used for headers in webhook calls (e.g. X-Gitness-Trigger, ...).
 	// NOTE: If no value is provided, the UserAgentIdentity will be used.
-	HeaderIdentity string `envconfig:"GITNESS_WEBHOOK_HEADER_IDENTITY"`
-	// EventReaderName is the name used to read events from stream.
-	// Note: this should be different for every running instance.
-	EventReaderName     string `envconfig:"GITNESS_WEBHOOK_EVENT_READER_NAME"`
-	Concurrency         int    `envconfig:"GITNESS_WEBHOOK_CONCURRENCY" default:"4"`
-	MaxRetries          int    `envconfig:"GITNESS_WEBHOOK_MAX_RETRIES" default:"3"`
-	AllowPrivateNetwork bool   `envconfig:"GITNESS_WEBHOOK_ALLOW_PRIVATE_NETWORK" default:"false"`
-	AllowLoopback       bool   `envconfig:"GITNESS_WEBHOOK_ALLOW_LOOPBACK" default:"false"`
+	HeaderIdentity      string
+	EventReaderName     string
+	Concurrency         int
+	MaxRetries          int
+	AllowPrivateNetwork bool
+	AllowLoopback       bool
 }
 
 func (c *Config) Prepare() error {
@@ -91,7 +89,7 @@ func NewService(ctx context.Context, config Config,
 	repoStore store.RepoStore, pullreqStore store.PullReqStore, urlProvider *url.Provider,
 	principalStore store.PrincipalStore, gitRPCClient gitrpc.Interface) (*Service, error) {
 	if err := config.Prepare(); err != nil {
-		return nil, fmt.Errorf("provided config is invalid: %w", err)
+		return nil, fmt.Errorf("provided webhook service config is invalid: %w", err)
 	}
 	service := &Service{
 		webhookStore:          webhookStore,

internal/services/wire.go

@@ -7,6 +7,7 @@ package services
 import (
 	"github.com/harness/gitness/internal/services/job"
 	"github.com/harness/gitness/internal/services/pullreq"
+	"github.com/harness/gitness/internal/services/trigger"
 	"github.com/harness/gitness/internal/services/webhook"
 
 	"github.com/google/wire"
@@ -19,20 +20,20 @@ var WireSet = wire.NewSet(
 type Services struct {
 	Webhook      *webhook.Service
 	PullReq      *pullreq.Service
-	JobExecutor  *job.Executor
+	Trigger      *trigger.Service
 	JobScheduler *job.Scheduler
 }
 
 func ProvideServices(
-	webhooksSrv *webhook.Service,
-	pullReqSrv *pullreq.Service,
-	jobExecutor *job.Executor,
+	webhooksSvc *webhook.Service,
+	pullReqSvc *pullreq.Service,
+	triggerSvc *trigger.Service,
 	jobScheduler *job.Scheduler,
 ) Services {
 	return Services{
-		Webhook:      webhooksSrv,
-		PullReq:      pullReqSrv,
-		JobExecutor:  jobExecutor,
+		Webhook:      webhooksSvc,
+		PullReq:      pullReqSvc,
+		Trigger:      triggerSvc,
 		JobScheduler: jobScheduler,
 	}
 }

types/config.go

@@ -200,4 +200,22 @@ type Config struct {
 		// finished and failed jobs will be purged from the DB.
 		PurgeFinishedOlderThan time.Duration `envconfig:"GITNESS_JOBS_PURGE_FINISHED_OLDER_THAN" default:"120h"`
 	}
+
+	Webhook struct {
+		// UserAgentIdentity specifies the identity used for the user agent header
+		// IMPORTANT: do not include version.
+		UserAgentIdentity string `envconfig:"GITNESS_WEBHOOK_USER_AGENT_IDENTITY" default:"Gitness"`
+		// HeaderIdentity specifies the identity used for headers in webhook calls (e.g. X-Gitness-Trigger, ...).
+		// NOTE: If no value is provided, the UserAgentIdentity will be used.
+		HeaderIdentity      string `envconfig:"GITNESS_WEBHOOK_HEADER_IDENTITY"`
+		Concurrency         int    `envconfig:"GITNESS_WEBHOOK_CONCURRENCY" default:"4"`
+		MaxRetries          int    `envconfig:"GITNESS_WEBHOOK_MAX_RETRIES" default:"3"`
+		AllowPrivateNetwork bool   `envconfig:"GITNESS_WEBHOOK_ALLOW_PRIVATE_NETWORK" default:"false"`
+		AllowLoopback       bool   `envconfig:"GITNESS_WEBHOOK_ALLOW_LOOPBACK" default:"false"`
+	}
+
+	Trigger struct {
+		Concurrency int `envconfig:"GITNESS_TRIGGER_CONCURRENCY" default:"4"`
+		MaxRetries  int `envconfig:"GITNESS_TRIGGER_MAX_RETRIES" default:"3"`
+	}
 }