storage-users: Add config option for graceful shutdown timeout

Add STORAGE_USERS_GRACEFUL_SHUTDOWN_TIMEOUT setting to allow a graceful
shutdown of the storage-users service. This currently only applicable
when running storage-user as a sepearate service.

Setting STORAGE_USERS_GRACEFUL_SHUTDOWN_TIMEOUT to a non-zero value
gives the storage-users service a chance to cleanly shutdown and finish
any in progess tasks (e.g. metadata propagation) before exiting.

Partial-Fix: #6602

services/storage-users/pkg/config/config.go

@@ -21,7 +21,8 @@ type Config struct {
 	TokenManager *TokenManager `yaml:"token_manager"`
 	Reva         *shared.Reva  `yaml:"reva"`
 
-	SkipUserGroupsInToken bool `yaml:"skip_user_groups_in_token" env:"STORAGE_USERS_SKIP_USER_GROUPS_IN_TOKEN" desc:"Disables the loading of user's group memberships from the reva access token."`
+	SkipUserGroupsInToken   bool `yaml:"skip_user_groups_in_token" env:"STORAGE_USERS_SKIP_USER_GROUPS_IN_TOKEN" desc:"Disables the loading of user's group memberships from the reva access token."`
+	GracefulShutdownTimeout int  `yaml:"graceful_shutdown_timeout" env:"STORAGE_USERS_GRACEFUL_SHUTDOWN_TIMEOUT" desc:"The number of seconds to wait for the service to shutdown cleanly before exiting with an error. Note: This setting is only applicable when running the 'storage-users' service as a standalone service."`
 
 	Driver            string            `yaml:"driver" env:"STORAGE_USERS_DRIVER" desc:"The storage driver which should be used by the service. Defaults to 'ocis', Supported values are: 'ocis', 's3ng' and 'owncloudsql'. The 'ocis' driver stores all data (blob and meta data) in an POSIX compliant volume. The 's3ng' driver stores metadata in a POSIX compliant volume and uploads blobs to the s3 bucket."`
 	Drivers           Drivers           `yaml:"drivers"`

services/storage-users/pkg/config/defaults/defaultconfig.go

@@ -41,12 +41,13 @@ func DefaultConfig() *config.Config {
 		Service: config.Service{
 			Name: "storage-users",
 		},
-		Reva:             shared.DefaultRevaConfig(),
-		DataServerURL:    "http://localhost:9158/data",
-		DataGatewayURL:   "https://localhost:9200/data",
-		TransferExpires:  86400,
-		UploadExpiration: 24 * 60 * 60,
-		Driver:           "ocis",
+		Reva:                    shared.DefaultRevaConfig(),
+		DataServerURL:           "http://localhost:9158/data",
+		DataGatewayURL:          "https://localhost:9200/data",
+		TransferExpires:         86400,
+		UploadExpiration:        24 * 60 * 60,
+		GracefulShutdownTimeout: 30,
+		Driver:                  "ocis",
 		Drivers: config.Drivers{
 			OwnCloudSQL: config.OwnCloudSQLDriver{
 				Root:                  filepath.Join(defaults.BaseDataPath(), "storage", "owncloud"),

services/storage-users/pkg/revaconfig/config.go

@@ -1,3 +1,4 @@
+// Package revaconfig contains the config for the reva service
 package revaconfig
 
 import (
@@ -10,11 +11,12 @@ import (
 func StorageUsersConfigFromStruct(cfg *config.Config) map[string]interface{} {
 	rcfg := map[string]interface{}{
 		"core": map[string]interface{}{
-			"tracing_enabled":      cfg.Tracing.Enabled,
-			"tracing_exporter":     cfg.Tracing.Type,
-			"tracing_endpoint":     cfg.Tracing.Endpoint,
-			"tracing_collector":    cfg.Tracing.Collector,
-			"tracing_service_name": cfg.Service.Name,
+			"tracing_enabled":           cfg.Tracing.Enabled,
+			"tracing_exporter":          cfg.Tracing.Type,
+			"tracing_endpoint":          cfg.Tracing.Endpoint,
+			"tracing_collector":         cfg.Tracing.Collector,
+			"tracing_service_name":      cfg.Service.Name,
+			"graceful_shutdown_timeout": cfg.GracefulShutdownTimeout,
 		},
 		"shared": map[string]interface{}{
 			"jwt_secret":                cfg.TokenManager.JWTSecret,