[CODE-717]: redis sentinel mode (#292)

cli/server/redis.go

@@ -5,15 +5,31 @@
 package server
 
 import (
+	"strings"
+
 	"github.com/harness/gitness/types"
 
 	"github.com/go-redis/redis/v8"
 )
 
 // ProvideRedis provides a redis client based on the configuration.
-// TODO: add support for sentinal / cluster
 // TODO: add support for TLS
 func ProvideRedis(config *types.Config) (redis.UniversalClient, error) {
+	if config.Redis.SentinelMode {
+		addrs := strings.Split(config.Redis.SentinelEndpoint, ",")
+
+		failoverOptions := &redis.FailoverOptions{
+			MasterName:    config.Redis.SentinelMaster,
+			SentinelAddrs: addrs,
+			MaxRetries:    config.Redis.MaxRetries,
+			MinIdleConns:  config.Redis.MinIdleConnections,
+		}
+		if config.Redis.Password != "" {
+			failoverOptions.Password = config.Redis.Password
+		}
+		return redis.NewFailoverClient(failoverOptions), nil
+	}
+
 	options := &redis.Options{
 		Addr:         config.Redis.Endpoint,
 		MaxRetries:   config.Redis.MaxRetries,

gitrpc/server/config.go

@@ -34,6 +34,9 @@ type Config struct {
 		MaxRetries         int    `envconfig:"GITRPC_REDIS_MAX_RETRIES"          default:"3"`
 		MinIdleConnections int    `envconfig:"GITRPC_REDIS_MIN_IDLE_CONNECTIONS" default:"0"`
 		Password           string `envconfig:"GITRPC_REDIS_PASSWORD"`
+		SentinelMode       bool   `envconfig:"GITRPC_REDIS_USE_SENTINEL"         default:"false"`
+		SentinelMaster     string `envconfig:"GITRPC_REDIS_SENTINEL_MASTER"`
+		SentinelEndpoint   string `envconfig:"GITRPC_REDIS_SENTINEL_ENDPOINT"`
 	}
 }
 

types/config.go

@@ -128,10 +128,13 @@ type Config struct {
 	}
 
 	Redis struct {
-		Endpoint           string `envconfig:"GITNESS_REDIS_ENDPOINT"             default:"localhost:6379"`
-		MaxRetries         int    `envconfig:"GITNESS_REDIS_MAX_RETRIES"          default:"3"`
-		MinIdleConnections int    `envconfig:"GITNESS_REDIS_MIN_IDLE_CONNECTIONS" default:"0"`
+		Endpoint           string `envconfig:"GITNESS_REDIS_ENDPOINT"              default:"localhost:6379"`
+		MaxRetries         int    `envconfig:"GITNESS_REDIS_MAX_RETRIES"           default:"3"`
+		MinIdleConnections int    `envconfig:"GITNESS_REDIS_MIN_IDLE_CONNECTIONS"  default:"0"`
 		Password           string `envconfig:"GITNESS_REDIS_PASSWORD"`
+		SentinelMode       bool   `envconfig:"GITNESS_REDIS_USE_SENTINEL"          default:"false"`
+		SentinelMaster     string `envconfig:"GITNESS_REDIS_SENTINEL_MASTER"`
+		SentinelEndpoint   string `envconfig:"GITNESS_REDIS_SENTINEL_ENDPOINT"`
 	}
 
 	Lock struct {