feat: add limited retry mechanism to prevent startup error if redis is not ready

internal/admin/bootstrap.go

@@ -22,7 +22,7 @@ func (s *Server) bootstrapProxies(ctx context.Context) error {
 	layerRepo := s.layerRepository
 
 	lockTimeout := time.Duration(s.bootstrapConfig.LockTimeout)
-	locker := redis.NewLocker(s.redisClient)
+	locker := redis.NewLocker(s.redisClient, int(s.bootstrapConfig.MaxConnectionRetries))
 
 	err := locker.WithLock(ctx, "bouncer-admin-bootstrap", lockTimeout, func(ctx context.Context) error {
 		logger.Info(ctx, "bootstrapping proxies")

internal/config/bootstrap.go

@@ -15,6 +15,7 @@ type BootstrapConfig struct {
 	Proxies              map[store.ProxyName]BootstrapProxyConfig `yaml:"proxies"`
 	Dir                  InterpolatedString                       `yaml:"dir"`
 	LockTimeout          InterpolatedDuration                     `yaml:"lockTimeout"`
+	MaxConnectionRetries InterpolatedInt                          `yaml:"maxRetries"`
 }
 
 func (c *BootstrapConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
@@ -64,6 +65,7 @@ func NewDefaultBootstrapConfig() BootstrapConfig {
 	return BootstrapConfig{
 		Dir:                  "",
 		LockTimeout:          *NewInterpolatedDuration(30 * time.Second),
+		MaxConnectionRetries: 10,
 	}
 }
 

internal/config/redis.go

@@ -14,6 +14,7 @@ type RedisConfig struct {
 	ReadTimeout    InterpolatedDuration    `yaml:"readTimeout"`
 	WriteTimeout   InterpolatedDuration    `yaml:"writeTimeout"`
 	DialTimeout    InterpolatedDuration    `yaml:"dialTimeout"`
+	LockMaxRetries InterpolatedInt         `yaml:"lockMaxRetries"`
 }
 
 func NewDefaultRedisConfig() RedisConfig {
@@ -23,5 +24,6 @@ func NewDefaultRedisConfig() RedisConfig {
 		ReadTimeout:    InterpolatedDuration(30 * time.Second),
 		WriteTimeout:   InterpolatedDuration(30 * time.Second),
 		DialTimeout:    InterpolatedDuration(30 * time.Second),
+		LockMaxRetries: 10,
 	}
 }

internal/lock/redis/locker.go

@@ -13,7 +13,7 @@ import (
 
 type Locker struct {
 	client     redis.UniversalClient
-	timeout time.Duration
+	maxRetries int
 }
 
 // WithLock implements lock.Locker.
@@ -26,6 +26,7 @@ func (l *Locker) WithLock(ctx context.Context, key string, timeout time.Duration
 
 	logger.Debug(ctx, "acquiring lock")
 
+	err := retryWithBackoff(ctx, l.maxRetries, func(ctx context.Context) error {
 		lock, err := locker.Obtain(ctx, key, timeout, &redislock.Options{
 			RetryStrategy: backoff,
 		})
@@ -47,12 +48,19 @@ func (l *Locker) WithLock(ctx context.Context, key string, timeout time.Duration
 			return errors.WithStack(err)
 		}
 
+		return nil
+	})
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
 	return nil
 }
 
-func NewLocker(client redis.UniversalClient) *Locker {
+func NewLocker(client redis.UniversalClient, maxRetries int) *Locker {
 	return &Locker{
 		client:     client,
+		maxRetries: maxRetries,
 	}
 }
 

internal/lock/redis/retry.go

@@ -0,0 +1,42 @@
+package redis
+
+import (
+	"context"
+	"time"
+
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+const (
+	baseWatchBackoffDelay = time.Millisecond * 500
+	maxDelay              = time.Minute * 10
+)
+
+func retryWithBackoff(ctx context.Context, attempts int, fn func(ctx context.Context) error) error {
+	backoffDelay := baseWatchBackoffDelay
+	count := 0
+
+	for {
+		err := fn(ctx)
+		if err == nil {
+			return nil
+		}
+
+		err = errors.WithStack(err)
+
+		count++
+		if count >= attempts {
+			return errors.Wrapf(err, "execution failed after %d attempts", attempts)
+		}
+
+		logger.Error(ctx, "error while executing func, retrying with backoff", logger.E(err), logger.F("backoffDelay", backoffDelay), logger.F("remainingAttempts", attempts-count))
+
+		time.Sleep(backoffDelay)
+
+		backoffDelay *= 2
+		if backoffDelay > maxDelay {
+			backoffDelay = maxDelay
+		}
+	}
+}

internal/setup/integrations.go

@@ -28,7 +28,7 @@ func SetupIntegrations(ctx context.Context, conf *config.Config) ([]integration.
 
 func setupKubernetesIntegration(ctx context.Context, conf *config.Config) (*kubernetes.Integration, error) {
 	client := newRedisClient(conf.Redis)
-	locker := redis.NewLocker(client)
+	locker := redis.NewLocker(client, 10)
 
 	integration := kubernetes.NewIntegration(
 		kubernetes.WithReaderTokenSecret(string(conf.Integrations.Kubernetes.ReaderTokenSecret)),

internal/setup/lock.go

@@ -10,6 +10,6 @@ import (
 
 func SetupLocker(ctx context.Context, conf *config.Config) (lock.Locker, error) {
 	client := newRedisClient(conf.Redis)
-	locker := redis.NewLocker(client)
+	locker := redis.NewLocker(client, int(conf.Redis.LockMaxRetries))
 	return locker, nil
 }