add code 'too early' (#230)

cs3/gateway/v1beta1/gateway_api.proto

@@ -108,6 +108,7 @@ service GatewayAPI {
   // then the entire directory is deleted recursively.
   // If a resource specifies a reference or symlink type, only the reference is removed (not the target).
   // MUST return CODE_NOT_FOUND if the reference does not exist.
+  // MUST return CODE_TOO_EARLY if some are not finished job over resource is still in process.
   rpc Delete(cs3.storage.provider.v1beta1.DeleteRequest) returns (cs3.storage.provider.v1beta1.DeleteResponse);
   // Returns the path reference for
   // the provided resource id reference.
@@ -145,7 +146,8 @@ service GatewayAPI {
   rpc ListRecycle(cs3.storage.provider.v1beta1.ListRecycleRequest) returns (cs3.storage.provider.v1beta1.ListRecycleResponse);
   // Moves a resource from one reference to another.
   // MUST return CODE_NOT_FOUND if any of the references do not exist.
-  // MUST return CODE_FAILED_PRECONDITION if the source reference
+  // MUST return CODE_FAILED_PRECONDITION if the source reference.
+  // MUST return CODE_TOO_EARLY if some are not finished job over resource is still in process.
   // cannot be moved to the destination reference.
   rpc Move(cs3.storage.provider.v1beta1.MoveRequest) returns (cs3.storage.provider.v1beta1.MoveResponse);
   // Permanently removes a recycle item from the recycle.

cs3/rpc/v1beta1/code.proto

@@ -183,19 +183,23 @@ enum Code {
   // Redirects the operation to another location.
   // Used in a Status reponse with a reference to the target URI.
   CODE_REDIRECTION = 18;
-  //
   // The operation could not be performed because there is not enough
   // storage available. This can be because of lack of real storage
   // space or because of the exceeding of a quota associated to a
   // storage.
   //
   // HTTP Mapping: 507 Insufficient Storage
   CODE_INSUFFICIENT_STORAGE = 19;
-  //
   // The ability to lock a resource is specific to some WebDAV servers.
   // The HTTP 423 Locked error response code indicates that either
   // the resources tentatively targeted by is locked, meaning it can't be accessed.
   //
   // HTTP Mapping: 423 Locked
   CODE_LOCKED = 20;
+  // The server returns the response status code to indicate that it has received
+  // the request but is not going to process it because an asynchronous job
+  // that has been started is still being processed and the result can not yet be provided.
+  //
+  // HTTP Mapping: 425 Too Early
+  CODE_TOO_EARLY = 21;
 }