pkg/settings/cresettings: env var for scoped settings

Author: jmank88

pkg/loop/server.go

@@ -18,6 +18,7 @@ import (
 	"github.com/smartcontractkit/chainlink-common/pkg/services"
 	"github.com/smartcontractkit/chainlink-common/pkg/services/otelhealth"
 	"github.com/smartcontractkit/chainlink-common/pkg/services/promhealth"
+	"github.com/smartcontractkit/chainlink-common/pkg/settings/cresettings"
 	"github.com/smartcontractkit/chainlink-common/pkg/settings/limits"
 	"github.com/smartcontractkit/chainlink-common/pkg/sqlutil"
 	"github.com/smartcontractkit/chainlink-common/pkg/sqlutil/pg"
@@ -223,6 +224,7 @@ func (s *Server) start() error {
 	s.LimitsFactory.Logger = s.Logger.Named("LimitsFactory")
 	if bc := beholder.GetClient(); bc != nil {
 		s.LimitsFactory.Meter = bc.Meter
+		s.LimitsFactory.Settings = cresettings.DefaultGetter
 	}
 
 	return nil

pkg/settings/cresettings/settings.go

@@ -1,4 +1,7 @@
 // Package cresettings contains configurable settings definitions for nodes in the CRE.
+// Environment Variables:
+//  - CL_CRE_SETTINGS_DEFAULT: defaults like in ./defaults.json - initializes Default
+// 	- CL_CRE_SETTINGS: scoped settings like in ../settings/testdata/config.json - initializes DefaultGetter
 package cresettings
 
 import (
@@ -14,7 +17,7 @@ import (
 )
 
 func init() {
-	if v, ok := os.LookupEnv("CL_CRE_SETTINGS"); ok {
+	if v, ok := os.LookupEnv("CL_CRE_SETTINGS_DEFAULT"); ok {
 		err := json.Unmarshal([]byte(v), &Default)
 		if err != nil {
 			log.Fatalf("failed to initialize defaults: %v", err)
@@ -25,8 +28,18 @@ func init() {
 		log.Fatalf("failed to initialize keys: %v", err)
 	}
 	Config = Default
+
+	if v, ok := os.LookupEnv("CL_CRE_SETTINGS"); ok {
+		DefaultGetter, err = NewJSONGetter([]byte(v))
+		if err != nil {
+			log.Fatalf("failed to initialize settings: %v", err)
+		}
+	}
 }
 
+// DefaultGetter is a default settings getter populated from the env var CL_CRE_SETTINGS if set, otherwise it is nil.
+var DefaultGetter Getter
+
 // Deprecated: use Default
 var Config Schema