feat: Add Redis upload cache for multi-replica deployments (#5724)

cmd/root.go

@@ -46,6 +46,7 @@ var (
 		"disable-type-detection-by-header": "disableTypeDetectionByHeader",
 		"img-processors":                   "imageProcessors",
 		"cache-dir":                        "cacheDir",
+		"redis-cache-url":                  "redisCacheUrl",
 		"token-expiration-time":            "tokenExpirationTime",
 		"baseurl":                          "baseURL",
 	}
@@ -88,6 +89,7 @@ func init() {
 	flags.String("password", "", "hashed password for the first user when using quick setup")
 	flags.Uint32("socketPerm", 0666, "unix socket file permissions")
 	flags.String("cacheDir", "", "file cache directory (disabled if empty)")
+	flags.String("redisCacheUrl", "", "redis cache URL (for multi-instance deployments), e.g. redis://user:pass@host:port")
 	flags.Int("imageProcessors", 4, "image processors count")
 	addServerFlags(flags)
 }
@@ -176,6 +178,12 @@ user created with the credentials from options "username" and "password".`,
 			fileCache = diskcache.New(afero.NewOsFs(), cacheDir)
 		}
 
+		redisCacheURL := v.GetString("redisCacheUrl")
+		uploadCache, err := fbhttp.NewUploadCache(redisCacheURL)
+		if err != nil {
+			return fmt.Errorf("failed to initialize upload cache: %w", err)
+		}
+
 		server, err := getServerSettings(v, st.Storage)
 		if err != nil {
 			return err
@@ -227,7 +235,7 @@ user created with the credentials from options "username" and "password".`,
 			panic(err)
 		}
 
-		handler, err := fbhttp.NewHandler(imageService, fileCache, st.Storage, server, assetsFs)
+		handler, err := fbhttp.NewHandler(imageService, fileCache, uploadCache, st.Storage, server, assetsFs)
 		if err != nil {
 			return err
 		}