feat: region procedure service (#137)

* feat: adds region service and procedure service

* refactor: adds procedure service for ddl and region task

* feat: adds QueryProcedureRequest

* feat: improve ProcedureStateResponse and MigrateRegionRequest

* fix: forgot headers

* fix: remove cluster_id in MigrateRegionRequest

* refactor: rename Procedure to ProcedureService

* chore: rename peer

* fix: forgot java Procedure

proto/greptime/v1/meta/common.proto

@@ -73,3 +73,8 @@ message KeyValue {
   // value is the value held by the key, in bytes.
   bytes value = 2;
 }
+
+// Procedure identifer
+message ProcedureId {
+  bytes key = 1;
+}

proto/greptime/v1/meta/ddl.proto

@@ -22,12 +22,6 @@ import "greptime/v1/meta/common.proto";
 import "greptime/v1/meta/route.proto";
 import "greptime/v1/ddl.proto";
 
-
-service DdlTask {
-    // Submits a DDL task to meta.
-    rpc SubmitDdlTask(SubmitDdlTaskRequest) returns (SubmitDdlTaskResponse);
-}
-
 enum DdlTaskType {
     Create = 0;
     Drop = 1;
@@ -57,7 +51,7 @@ message TruncateTableTask {
     TruncateTableExpr truncate_table = 1;
 }
 
-message SubmitDdlTaskRequest {
+message DdlTaskRequest {
     RequestHeader header = 1;
 
     oneof task {
@@ -71,10 +65,9 @@ message SubmitDdlTaskRequest {
      }
 }
 
-message SubmitDdlTaskResponse {
+message DdlTaskResponse {
     ResponseHeader header = 1;
-    // Key is the identifier for the ddl task.
-    bytes key = 2;
+    ProcedureId pid = 2;
 
     // Returns if table created.
     // TODO(jeremy): remove it?

proto/greptime/v1/meta/procedure.proto

@@ -0,0 +1,42 @@
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package greptime.v1.meta;
+
+option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/meta";
+
+import "greptime/v1/meta/common.proto";
+import "greptime/v1/meta/ddl.proto";
+import "greptime/v1/meta/region.proto";
+
+enum ProcedureStatus {
+    Running = 0;
+    Done = 1;
+    Retrying = 2;
+    Failed = 3;
+}
+
+message QueryProcedureRequest {
+    RequestHeader header = 1;
+    ProcedureId pid = 2;
+}
+
+message ProcedureStateResponse {
+    ResponseHeader header = 1;
+    ProcedureStatus status = 2;
+    string error = 3;
+}
+
+service ProcedureService {
+    // Query a submitted procedure state
+    rpc query(QueryProcedureRequest) returns (ProcedureStateResponse);
+
+    // Submits a DDL task
+    rpc ddl(DdlTaskRequest) returns (DdlTaskResponse);
+
+    // Submits a region migration task
+    rpc migrate(MigrateRegionRequest) returns (MigrateRegionResponse);
+}

proto/greptime/v1/meta/region.proto

@@ -0,0 +1,34 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package greptime.v1.meta;
+
+option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/meta";
+
+import "greptime/v1/meta/common.proto";
+
+message MigrateRegionRequest {
+    RequestHeader header = 1;
+    uint64 region_id = 3;
+    uint64 from_peer = 4;
+    uint64 to_peer = 5;
+    uint32 replay_timeout_secs = 6;
+}
+
+message MigrateRegionResponse {
+    ResponseHeader header = 1;
+    ProcedureId pid = 2;
+}