fix(flagd): do not retry for certain status codes (#756)

providers/flagd/e2e/inprocess_test.go

@@ -26,7 +26,7 @@ func TestInProcessProviderE2E(t *testing.T) {
 	}
 
 	// Run tests with in-process specific tags
-	tags := "@in-process && ~@unixsocket && ~@metadata && ~@customCert && ~@contextEnrichment && ~@sync-payload"
+	tags := "@in-process && ~@unixsocket && ~@metadata && ~@customCert && ~@contextEnrichment && ~@sync-payload && ~@sync-port"
 
 	if err := runner.RunGherkinTestsWithSubtests(t, featurePaths, tags); err != nil {
 		t.Fatalf("Gherkin tests failed: %v", err)

providers/flagd/e2e/rpc_test.go

@@ -26,7 +26,7 @@ func TestRPCProviderE2E(t *testing.T) {
 	}
 
 	// Run tests with RPC-specific tags - exclude unimplemented scenarios
-	tags := "@rpc && ~@unixsocket && ~@targetURI && ~@sync && ~@metadata && ~@grace && ~@customCert && ~@caching"
+	tags := "@rpc && ~@unixsocket && ~@targetURI && ~@sync && ~@metadata && ~@grace && ~@customCert && ~@caching && ~@forbidden"
 
 	if err := runner.RunGherkinTestsWithSubtests(t, featurePaths, tags); err != nil {
 		t.Fatalf("Gherkin tests failed: %v", err)

providers/flagd/pkg/configuration.go

@@ -3,14 +3,15 @@ package flagd
 import (
 	"errors"
 	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
 	"github.com/go-logr/logr"
 	"github.com/open-feature/flagd/core/pkg/sync"
 	"github.com/open-feature/go-sdk-contrib/providers/flagd/internal/cache"
 	"github.com/open-feature/go-sdk-contrib/providers/flagd/internal/logger"
 	"google.golang.org/grpc"
-	"os"
-	"strconv"
-	"strings"
 )
 
 type ResolverType string
@@ -26,6 +27,7 @@ const (
 	defaultHost                         = "localhost"
 	defaultResolver                     = rpc
 	defaultGracePeriod                  = 5
+	defaultFatalStatusCodes             = ""
 
 	rpc       ResolverType = "rpc"
 	inProcess ResolverType = "in-process"
@@ -45,6 +47,7 @@ const (
 	flagdOfflinePathEnvironmentVariableName           = "FLAGD_OFFLINE_FLAG_SOURCE_PATH"
 	flagdTargetUriEnvironmentVariableName             = "FLAGD_TARGET_URI"
 	flagdGracePeriodVariableName                      = "FLAGD_RETRY_GRACE_PERIOD"
+	flagdFatalStatusCodesVariableName                 = "FLAGD_FATAL_STATUS_CODES"
 )
 
 type ProviderConfiguration struct {
@@ -66,6 +69,7 @@ type ProviderConfiguration struct {
 	CustomSyncProviderUri            string
 	GrpcDialOptionsOverride          []grpc.DialOption
 	RetryGracePeriod                 int
+	FatalStatusCodes                 []string
 
 	log logr.Logger
 }
@@ -80,6 +84,7 @@ func newDefaultConfiguration(log logr.Logger) *ProviderConfiguration {
 		Resolver:                         defaultResolver,
 		Tls:                              defaultTLS,
 		RetryGracePeriod:                 defaultGracePeriod,
+		FatalStatusCodes:                 strings.Split(defaultFatalStatusCodes, ","),
 	}
 
 	p.updateFromEnvVar()
@@ -130,6 +135,7 @@ func validateProviderConfiguration(p *ProviderConfiguration) error {
 
 // updateFromEnvVar is a utility to update configurations based on current environment variables
 func (cfg *ProviderConfiguration) updateFromEnvVar() {
+
 	portS := os.Getenv(flagdPortEnvironmentVariableName)
 	if portS != "" {
 		port, err := strconv.Atoi(portS)
@@ -159,17 +165,7 @@ func (cfg *ProviderConfiguration) updateFromEnvVar() {
 		cfg.CertPath = certificatePath
 	}
 
-	if maxCacheSizeS := os.Getenv(flagdMaxCacheSizeEnvironmentVariableName); maxCacheSizeS != "" {
-		maxCacheSizeFromEnv, err := strconv.Atoi(maxCacheSizeS)
-		if err != nil {
-			cfg.log.Error(err,
-				fmt.Sprintf("invalid env config for %s provided, using default value: %d",
-					flagdMaxCacheSizeEnvironmentVariableName, defaultMaxCacheSize,
-				))
-		} else {
-			cfg.MaxCacheSize = maxCacheSizeFromEnv
-		}
-	}
+	cfg.MaxCacheSize = getIntFromEnvVarOrDefault(flagdMaxCacheSizeEnvironmentVariableName, defaultMaxCacheSize, cfg.log)
 
 	if cacheValue := os.Getenv(flagdCacheEnvironmentVariableName); cacheValue != "" {
 		switch cache.Type(cacheValue) {
@@ -185,18 +181,8 @@ func (cfg *ProviderConfiguration) updateFromEnvVar() {
 		}
 	}
 
-	if maxEventStreamRetriesS := os.Getenv(
-		flagdMaxEventStreamRetriesEnvironmentVariableName); maxEventStreamRetriesS != "" {
-
-		maxEventStreamRetries, err := strconv.Atoi(maxEventStreamRetriesS)
-		if err != nil {
-			cfg.log.Error(err,
-				fmt.Sprintf("invalid env config for %s provided, using default value: %d",
-					flagdMaxEventStreamRetriesEnvironmentVariableName, defaultMaxEventStreamRetries))
-		} else {
-			cfg.EventStreamConnectionMaxAttempts = maxEventStreamRetries
-		}
-	}
+	cfg.EventStreamConnectionMaxAttempts = getIntFromEnvVarOrDefault(
+		flagdMaxEventStreamRetriesEnvironmentVariableName, defaultMaxEventStreamRetries, cfg.log)
 
 	if resolver := os.Getenv(flagdResolverEnvironmentVariableName); resolver != "" {
 		switch strings.ToLower(resolver) {
@@ -230,12 +216,34 @@ func (cfg *ProviderConfiguration) updateFromEnvVar() {
 	if gracePeriod := os.Getenv(flagdGracePeriodVariableName); gracePeriod != "" {
 		if seconds, err := strconv.Atoi(gracePeriod); err == nil {
 			cfg.RetryGracePeriod = seconds
-		} else {
-			// Handle parsing error
-			cfg.log.Error(err, fmt.Sprintf("invalid grace period '%s'", gracePeriod))
+			cfg.RetryGracePeriod = getIntFromEnvVarOrDefault(flagdGracePeriodVariableName, defaultGracePeriod, cfg.log)
 		}
 	}
 
+	if fatalStatusCodes := os.Getenv(flagdFatalStatusCodesVariableName); fatalStatusCodes != "" {
+		fatalStatusCodesArr := strings.Split(fatalStatusCodes, ",")
+		for i, fatalStatusCode := range fatalStatusCodesArr {
+			fatalStatusCodesArr[i] = strings.TrimSpace(fatalStatusCode)
+		}
+		cfg.FatalStatusCodes = fatalStatusCodesArr
+	}
+}
+
+// Helper
+
+func getIntFromEnvVarOrDefault(envVarName string, defaultValue int, log logr.Logger) int {
+	if valueFromEnv := os.Getenv(envVarName); valueFromEnv != "" {
+		intValue, err := strconv.Atoi(valueFromEnv)
+		if err != nil {
+			log.Error(err,
+				fmt.Sprintf("invalid env config for %s provided, using default value: %d",
+					envVarName, defaultValue,
+				))
+		} else {
+			return intValue
+		}
+	}
+	return defaultValue
 }
 
 // ProviderOptions
@@ -415,3 +423,11 @@ func WithRetryGracePeriod(gracePeriod int) ProviderOption {
 		p.RetryGracePeriod = gracePeriod
 	}
 }
+
+// WithFatalStatusCodes allows to set a list of gRPC status codes, which will cause streams to give up
+// and put the provider in a PROVIDER_FATAL state
+func WithFatalStatusCodes(fatalStatusCodes []string) ProviderOption {
+	return func(p *ProviderConfiguration) {
+		p.FatalStatusCodes = fatalStatusCodes
+	}
+}

providers/flagd/pkg/provider.go

@@ -74,6 +74,7 @@ func NewProvider(opts ...ProviderOption) (*Provider, error) {
 			CustomSyncProviderUri:   provider.providerConfiguration.CustomSyncProviderUri,
 			GrpcDialOptionsOverride: provider.providerConfiguration.GrpcDialOptionsOverride,
 			RetryGracePeriod:        provider.providerConfiguration.RetryGracePeriod,
+			FatalStatusCodes:        provider.providerConfiguration.FatalStatusCodes,
 		})
 	default:
 		service = process.NewInProcessService(process.Configuration{

providers/flagd/pkg/service/in_process/grpc_config.go

@@ -0,0 +1,66 @@
+package process
+
+import (
+	"encoding/json"
+	"fmt"
+	"google.golang.org/grpc/codes"
+	"time"
+)
+
+const (
+	// Default timeouts and retry intervals
+	defaultKeepaliveTime    = 30 * time.Second
+	defaultKeepaliveTimeout = 5 * time.Second
+)
+
+type RetryPolicy struct {
+	MaxAttempts          int      `json:"MaxAttempts"`
+	InitialBackoff       string   `json:"InitialBackoff"`
+	MaxBackoff           string   `json:"MaxBackoff"`
+	BackoffMultiplier    float64  `json:"BackoffMultiplier"`
+	RetryableStatusCodes []string `json:"RetryableStatusCodes"`
+}
+
+func (g *Sync) buildRetryPolicy() string {
+	var policy = map[string]interface{}{
+		"methodConfig": []map[string]interface{}{
+			{
+				"name": []map[string]string{
+					{"service": "flagd.sync.v1.FlagSyncService"},
+				},
+				"retryPolicy": RetryPolicy{
+					MaxAttempts:          3,
+					InitialBackoff:       "1s",
+					MaxBackoff:           "5s",
+					BackoffMultiplier:    2.0,
+					RetryableStatusCodes: []string{"UNKNOWN", "UNAVAILABLE"},
+				},
+			},
+		},
+	}
+	retryPolicyBytes, _ := json.Marshal(policy)
+	retryPolicy := string(retryPolicyBytes)
+
+	return retryPolicy
+}
+
+// Set of non-retryable gRPC status codes for faster lookup
+var nonRetryableCodes map[codes.Code]struct{}
+
+// initNonRetryableStatusCodesSet initializes the set of non-retryable gRPC status codes for quick lookup
+func (g *Sync) initNonRetryableStatusCodesSet() {
+	nonRetryableCodes = make(map[codes.Code]struct{})
+
+	for _, codeStr := range g.FatalStatusCodes {
+		// Wrap the string in quotes to match the expected JSON format
+		jsonStr := fmt.Sprintf(`"%s"`, codeStr)
+
+		var code codes.Code
+		if err := code.UnmarshalJSON([]byte(jsonStr)); err != nil {
+			g.Logger.Warn(fmt.Sprintf("unknown status code: %s, error: %v", codeStr, err))
+			continue
+		}
+
+		nonRetryableCodes[code] = struct{}{}
+	}
+}

providers/flagd/pkg/service/in_process/grpc_config_test.go

@@ -0,0 +1,77 @@
+package process
+
+import (
+	"github.com/open-feature/flagd/core/pkg/logger"
+	"go.uber.org/zap"
+	"google.golang.org/grpc/codes"
+	"testing"
+)
+
+func TestSync_initNonRetryableStatusCodesSet(t *testing.T) {
+	tests := []struct {
+		name             string
+		fatalStatusCodes []string
+		expectedCodes    []codes.Code
+		notExpectedCodes []codes.Code
+	}{
+		{
+			name:             "valid status codes",
+			fatalStatusCodes: []string{"UNAVAILABLE", "INTERNAL", "DEADLINE_EXCEEDED"},
+			expectedCodes:    []codes.Code{codes.Unavailable, codes.Internal, codes.DeadlineExceeded},
+			notExpectedCodes: []codes.Code{codes.OK, codes.Unknown},
+		},
+		{
+			name:             "empty array",
+			fatalStatusCodes: []string{},
+			expectedCodes:    []codes.Code{},
+			notExpectedCodes: []codes.Code{codes.Unavailable, codes.Internal},
+		},
+		{
+			name:             "invalid status codes",
+			fatalStatusCodes: []string{"INVALID_CODE", "UNKNOWN_STATUS"},
+			expectedCodes:    []codes.Code{},
+			notExpectedCodes: []codes.Code{codes.Unavailable, codes.Internal},
+		},
+		{
+			name:             "mixed valid and invalid codes",
+			fatalStatusCodes: []string{"UNAVAILABLE", "INVALID_CODE", "INTERNAL"},
+			expectedCodes:    []codes.Code{codes.Unavailable, codes.Internal},
+			notExpectedCodes: []codes.Code{codes.OK, codes.Unknown},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Reset the global map before each test
+			nonRetryableCodes = nil
+
+			s := &Sync{
+				FatalStatusCodes: tt.fatalStatusCodes,
+				Logger: &logger.Logger{
+					Logger: zap.NewNop(),
+				},
+			}
+
+			s.initNonRetryableStatusCodesSet()
+
+			// Verify expected codes are present
+			for _, code := range tt.expectedCodes {
+				if _, exists := nonRetryableCodes[code]; !exists {
+					t.Errorf("expected code %v to be in nonRetryableCodes, but it was not found", code)
+				}
+			}
+
+			// Verify not expected codes are absent
+			for _, code := range tt.notExpectedCodes {
+				if _, exists := nonRetryableCodes[code]; exists {
+					t.Errorf("did not expect code %v to be in nonRetryableCodes, but it was found", code)
+				}
+			}
+
+			// Verify the map size matches expected
+			if len(nonRetryableCodes) != len(tt.expectedCodes) {
+				t.Errorf("expected map size %d, got %d", len(tt.expectedCodes), len(nonRetryableCodes))
+			}
+		})
+	}
+}