Add NATS publisher support to reminder

Signed-off-by: Vyom Yadav <[email protected]>

config/reminder-config.yaml.example

@@ -18,10 +18,17 @@ logging:
   level: "debug"
 
 events:
-  sql_connection:
-    dbhost: "watermill-postgres"
-    dbport: 5432
-    dbuser: postgres
-    dbpass: postgres
-    dbname: watermill
-    sslmode: disable
+  driver: "sql"
+#  driver: "cloudevents-nats"
+  sql:
+    connection:
+      dbhost: "watermill-postgres"
+      dbport: 5432
+      dbuser: postgres
+      dbpass: postgres
+      dbname: watermill
+      sslmode: disable
+#  nats:
+#    url: "nats://localhost:4222"
+#    prefix: "minder"
+#    queue: "minder"

internal/events/events.go

@@ -150,7 +150,7 @@ func instantiateDriver(
 		return eventersql.BuildPostgreSQLDriver(ctx, cfg)
 	case constants.NATSDriver:
 		zerolog.Ctx(ctx).Info().Msg("Using NATS driver")
-		return nats.BuildNatsChannelDriver(cfg)
+		return nats.BuildNatsChannelDriver(&cfg.Nats)
 	default:
 		zerolog.Ctx(ctx).Info().Msg("Driver unknown")
 		return nil, nil, nil, fmt.Errorf("unknown driver %s", driver)

internal/events/nats/natschannel.go

@@ -19,20 +19,24 @@ import (
 	"github.com/rs/zerolog"
 
 	"github.com/mindersec/minder/internal/events/common"
-	serverconfig "github.com/mindersec/minder/pkg/config/server"
+	"github.com/mindersec/minder/pkg/config"
 )
 
 // BuildNatsChannelDriver creates a new event driver using
 // CloudEvents with the NATS-JetStream transport
-func BuildNatsChannelDriver(cfg *serverconfig.EventConfig) (message.Publisher, message.Subscriber, common.DriverCloser, error) {
-	adapter := &cloudEventsNatsAdapter{cfg: &cfg.Nats}
+func BuildNatsChannelDriver(cfg *config.NatsConfig) (message.Publisher, message.Subscriber, common.DriverCloser, error) {
+	if cfg == nil {
+		return nil, nil, nil, fmt.Errorf("NATS config is nil")
+	}
+
+	adapter := &cloudEventsNatsAdapter{cfg: cfg}
 	return adapter, adapter, func() {}, nil
 }
 
 // CloudEventsNatsPublisher actually consumes a _set_ of NATS topics,
 // because CloudEvents-Jetstream has a separate Consumer for each topic
 type cloudEventsNatsAdapter struct {
-	cfg  *serverconfig.NatsConfig
+	cfg  *config.NatsConfig
 	lock sync.Mutex
 	// Keep a cache of the topics we subscribe/publish to
 	topics map[string]topicState

internal/events/nats/natschannel_test.go

@@ -16,6 +16,7 @@ import (
 	natsserver "github.com/nats-io/nats-server/v2/test"
 
 	"github.com/mindersec/minder/internal/events/common"
+	"github.com/mindersec/minder/pkg/config"
 	serverconfig "github.com/mindersec/minder/pkg/config/server"
 )
 
@@ -27,7 +28,7 @@ func TestNatsChannel(t *testing.T) {
 	}
 	defer server.Shutdown()
 	cfg := serverconfig.EventConfig{
-		Nats: serverconfig.NatsConfig{
+		Nats: config.NatsConfig{
 			URL:    server.ClientURL(),
 			Prefix: "test",
 			Queue:  "minder",
@@ -120,7 +121,7 @@ loop:
 }
 
 func buildDriverPair(ctx context.Context, cfg serverconfig.EventConfig) (message.Publisher, message.Subscriber, common.DriverCloser, <-chan *message.Message, error) {
-	pub, sub, closer, err := BuildNatsChannelDriver(&cfg)
+	pub, sub, closer, err := BuildNatsChannelDriver(&cfg.Nats)
 	if err != nil {
 		return nil, nil, nil, nil, fmt.Errorf("failed to build nats channel driver: %v", err)
 	}

internal/reminder/sql_publisher.go → internal/reminder/publisher.go

@@ -13,12 +13,33 @@ import (
 	"github.com/rs/zerolog"
 
 	"github.com/mindersec/minder/internal/events/common"
+	natsinternal "github.com/mindersec/minder/internal/events/nats"
+	"github.com/mindersec/minder/pkg/eventer/constants"
 )
 
+func (r *reminder) getMessagePublisher(ctx context.Context) (message.Publisher, common.DriverCloser, error) {
+	switch r.cfg.EventConfig.Driver {
+	case constants.NATSDriver:
+		return r.setupNATSPublisher(ctx)
+	case constants.SQLDriver:
+		return r.setupSQLPublisher(ctx)
+	default:
+		return nil, nil, fmt.Errorf("unknown publisher type: %s", r.cfg.EventConfig.Driver)
+	}
+}
+
+func (r *reminder) setupNATSPublisher(_ context.Context) (message.Publisher, common.DriverCloser, error) {
+	pub, _, cl, err := natsinternal.BuildNatsChannelDriver(&r.cfg.EventConfig.NatsConfig)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to create NATS publisher: %w", err)
+	}
+	return pub, cl, nil
+}
+
 func (r *reminder) setupSQLPublisher(ctx context.Context) (message.Publisher, common.DriverCloser, error) {
 	logger := zerolog.Ctx(ctx)
 
-	db, _, err := r.cfg.EventConfig.Connection.GetDBConnection(ctx)
+	db, _, err := r.cfg.EventConfig.SQLPubConfig.Connection.GetDBConnection(ctx)
 	if err != nil {
 		return nil, nil, fmt.Errorf("unable to connect to events database: %w", err)
 	}

internal/reminder/reminder.go

@@ -59,7 +59,7 @@ func NewReminder(ctx context.Context, store db.Store, config *reminderconfig.Con
 	logger := zerolog.Ctx(ctx)
 	logger.Info().Msgf("initial repository cursor: %s", r.repositoryCursor)
 
-	pub, cl, err := r.setupSQLPublisher(ctx)
+	pub, cl, err := r.getMessagePublisher(ctx)
 	if err != nil {
 		return nil, err
 	}

pkg/config/common.go

@@ -149,3 +149,14 @@ func ReadKey(keypath string) ([]byte, error) {
 
 	return data, nil
 }
+
+// NatsConfig is the configuration when using NATS as the event driver
+type NatsConfig struct {
+	// URL is the URL for the NATS server
+	URL string `mapstructure:"url" default:"nats://localhost:4222"`
+	// Prefix is the prefix for the NATS subjects to subscribe to
+	Prefix string `mapstructure:"prefix" default:"minder"`
+	// Queue is the name of the queue group to join when consuming messages
+	// queue groups allow multiple process to round-robin process messages.
+	Queue string `mapstructure:"queue" default:"minder"`
+}

pkg/config/reminder/config_test.go

@@ -35,8 +35,10 @@ func TestValidateConfig(t *testing.T) {
 					MinElapsed: parseTimeDuration(t, "1h"),
 				},
 				EventConfig: reminder.EventConfig{
-					Connection: config.DatabaseConfig{
-						Port: 8080,
+					SQLPubConfig: reminder.SQLPubConfig{
+						Connection: config.DatabaseConfig{
+							Port: 8080,
+						},
 					},
 				},
 			},

pkg/config/reminder/events.go

@@ -9,8 +9,15 @@ import (
 
 // EventConfig is the configuration for reminder's eventing system.
 type EventConfig struct {
+	Driver       string            `mapstructure:"driver" default:"sql"`
+	SQLPubConfig SQLPubConfig      `mapstructure:"sql"`
+	NatsConfig   config.NatsConfig `mapstructure:"nats"`
+}
+
+// SQLPubConfig is the configuration for the SQL publisher
+type SQLPubConfig struct {
 	// Connection is the configuration for the SQL event driver
 	//
 	// nolint: lll
-	Connection config.DatabaseConfig `mapstructure:"sql_connection" default:"{\"dbname\":\"reminder\",\"dbhost\":\"reminder-event-postgres\"}"`
+	Connection config.DatabaseConfig `mapstructure:"connection" default:"{\"dbname\":\"reminder\",\"dbhost\":\"reminder-event-postgres\"}"`
 }

pkg/config/server/events.go

@@ -22,7 +22,7 @@ type EventConfig struct {
 	// Aggregator is the configuration for the event aggregator middleware
 	Aggregator AggregatorConfig `mapstructure:"aggregator"`
 	// Nats is the configuration when using NATS as the event driver
-	Nats NatsConfig `mapstructure:"nats"`
+	Nats config.NatsConfig `mapstructure:"nats"`
 }
 
 // GoChannelEventConfig is the configuration for the go channel event driver
@@ -54,14 +54,3 @@ type AggregatorConfig struct {
 	// This is the threshold between rule evaluations + actions.
 	LockInterval int64 `mapstructure:"lock_interval" default:"30"`
 }
-
-// NatsConfig is the configuration when using NATS as the event driver
-type NatsConfig struct {
-	// URL is the URL for the NATS server
-	URL string `mapstructure:"url" default:"nats://localhost:4222"`
-	// Prefix is the prefix for the NATS subjects to subscribe to
-	Prefix string `mapstructure:"prefix" default:"minder"`
-	// Queue is the name of the queue group to join when consuming messages
-	// queue groups allow multiple process to round-robin process messages.
-	Queue string `mapstructure:"queue" default:"minder"`
-}