refactor: topic provisioner config

cmd/balance-worker/main.go

@@ -266,8 +266,8 @@ func initTopicProvisioner(conf config.Configuration, logger *slog.Logger, meter
 		AdminClient: adminClient,
 		Logger:      logger,
 		Meter:       meter,
-		CacheSize:   conf.Ingest.CacheSize,
-		CacheTTL:    conf.Ingest.CacheTTL,
+		CacheSize:   conf.Ingest.Kafka.CacheSize,
+		CacheTTL:    conf.Ingest.Kafka.CacheTTL,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize topic provisioner: %w", err)

cmd/notification-service/main.go

@@ -295,8 +295,8 @@ func initTopicProvisioner(conf config.Configuration, logger *slog.Logger, meter
 		AdminClient: adminClient,
 		Logger:      logger,
 		Meter:       meter,
-		CacheSize:   conf.Ingest.CacheSize,
-		CacheTTL:    conf.Ingest.CacheTTL,
+		CacheSize:   conf.Ingest.Kafka.CacheSize,
+		CacheTTL:    conf.Ingest.Kafka.CacheTTL,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize topic provisioner: %w", err)

cmd/sink-worker/main.go

@@ -310,8 +310,8 @@ func initTopicProvisioner(conf config.Configuration, logger *slog.Logger, meter
 		AdminClient: adminClient,
 		Logger:      logger,
 		Meter:       meter,
-		CacheSize:   conf.Ingest.CacheSize,
-		CacheTTL:    conf.Ingest.CacheTTL,
+		CacheSize:   conf.Ingest.Kafka.CacheSize,
+		CacheTTL:    conf.Ingest.Kafka.CacheTTL,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize topic provisioner: %w", err)

config/config_test.go

@@ -101,9 +101,11 @@ func TestComplete(t *testing.T) {
 				},
 				Partitions:          1,
 				EventsTopicTemplate: "om_%s_events",
+				TopicProvisionerConfig: TopicProvisionerConfig{
+					CacheSize: 200,
+					CacheTTL:  15 * time.Minute,
+				},
 			},
-			CacheSize: 200,
-			CacheTTL:  15 * time.Minute,
 		},
 		Aggregation: AggregationConfiguration{
 			ClickHouse: ClickHouseAggregationConfiguration{

config/ingest.go

@@ -14,13 +14,6 @@ import (
 
 type IngestConfiguration struct {
 	Kafka KafkaIngestConfiguration
-
-	// The maximum number of entries stored in topic cache at a time which after the least recently used is evicted.
-	// Setting size to 0 makes it unlimited
-	CacheSize int
-
-	// The maximum time an entries is kept in cache before being evicted
-	CacheTTL time.Duration
 }
 
 // Validate validates the configuration.
@@ -37,6 +30,8 @@ func (c IngestConfiguration) Validate() error {
 type KafkaIngestConfiguration struct {
 	KafkaConfiguration `mapstructure:",squash"`
 
+	TopicProvisionerConfig `mapstructure:",squash"`
+
 	Partitions          int
 	EventsTopicTemplate string
 }
@@ -53,6 +48,10 @@ func (c KafkaIngestConfiguration) Validate() error {
 		errs = append(errs, err)
 	}
 
+	if err := c.TopicProvisionerConfig.Validate(); err != nil {
+		errs = append(errs, err)
+	}
+
 	return errors.Join(errs...)
 }
 
@@ -167,6 +166,6 @@ func ConfigureIngest(v *viper.Viper) {
 	v.SetDefault("ingest.kafka.saslPassword", "")
 	v.SetDefault("ingest.kafka.partitions", 1)
 	v.SetDefault("ingest.kafka.eventsTopicTemplate", "om_%s_events")
-	v.SetDefault("ingest.cacheSize", 250)
-	v.SetDefault("ingest.cacheTTL", "5m")
+
+	ConfigureTopicProvisioner(v, "ingest", "kafka")
 }

config/testdata/complete.yaml

@@ -43,8 +43,8 @@ ingest:
       - broker
       - topic
       - consumer
-  cacheSize: 200
-  cacheTTL: 15m
+    cacheSize: 200
+    cacheTTL: 15m
 
 aggregation:
   clickhouse:

config/topicprovisioner.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/spf13/viper"
+)
+
+// TopicProvisionerConfig stores the configuration for TopicProvisioner
+type TopicProvisionerConfig struct {
+	// The maximum number of entries stored in topic cache at a time which after the least recently used is evicted.
+	// Setting size to 0 makes it unlimited
+	CacheSize int
+
+	// The maximum time an entries is kept in cache before being evicted
+	CacheTTL time.Duration
+}
+
+func (c TopicProvisionerConfig) Validate() error {
+	var errs []error
+
+	if c.CacheSize < 0 {
+		errs = append(errs, fmt.Errorf("invalid cache size: %d", c.CacheSize))
+	}
+
+	if c.CacheTTL < 0 {
+		errs = append(errs, fmt.Errorf("invalid cache ttl: %d", c.CacheTTL))
+	}
+
+	return errors.Join(errs...)
+}
+
+// ConfigureTopicProvisioner configures some defaults in the Viper instance.
+func ConfigureTopicProvisioner(v *viper.Viper, prefixes ...string) {
+	prefixer := NewViperKeyPrefixer(prefixes...)
+
+	v.SetDefault(prefixer("cacheSize"), 250)
+	v.SetDefault(prefixer("cacheTTL"), "5m")
+}

config/viper.go

@@ -13,3 +13,36 @@ func DecodeHook() mapstructure.DecodeHookFunc {
 		mapstructure.StringToSliceHookFunc(","),
 	)
 }
+
+// ViperKeyPrefixer is a helper to prepend prefix to a key name.
+type ViperKeyPrefixer func(s string) string
+
+const delimiter = "."
+
+// NewViperKeyPrefixer returns a new ViperKeyPrefixer which prepends a dot delimited prefix calculated by concatenating provided
+// prefixes in the order they appear in prefixes list.
+//
+//	prefixer := NewViperKeyPrefixer("a", "b")
+//	s := prefixer("c")
+//	fmt.Println(s) // -> "a.b.c"
+func NewViperKeyPrefixer(prefixes ...string) ViperKeyPrefixer {
+	var prefix string
+
+	for _, p := range prefixes {
+		if p == "" {
+			continue
+		}
+
+		if prefix == "" {
+			prefix = p
+		} else {
+			prefix += delimiter + p
+		}
+	}
+
+	if prefix == "" {
+		return func(s string) string { return s }
+	} else {
+		return func(s string) string { return prefix + delimiter + s }
+	}
+}

openmeter/app/kafka.go

@@ -58,8 +58,8 @@ func NewKafkaTopicProvisioner(conf config.IngestConfiguration, logger *slog.Logg
 		AdminClient: adminClient,
 		Logger:      logger,
 		Meter:       meter,
-		CacheSize:   conf.CacheSize,
-		CacheTTL:    conf.CacheTTL,
+		CacheSize:   conf.Kafka.CacheSize,
+		CacheTTL:    conf.Kafka.CacheTTL,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize topic provisioner: %w", err)