syntax = "proto3";

package meta_event;
option go_package = "github.com/CeresDB/ceresdbproto/golang/pkg/metaeventpb";

import "common.proto";
import "meta_service.proto";

// The service is hosted by CeresDB to handle the events from CeresMeta.
service MetaEventService {
  rpc OpenShard(OpenShardRequest) returns (OpenShardResponse) {}
  rpc CloseShard(CloseShardRequest) returns (CloseShardResponse) {}
  rpc CreateTableOnShard(CreateTableOnShardRequest)
      returns (CreateTableOnShardResponse) {}
  rpc DropTableOnShard(DropTableOnShardRequest)
      returns (DropTableOnShardResponse) {}
  rpc OpenTableOnShard(OpenTableOnShardRequest)
      returns (OpenTableOnShardResponse) {}
  rpc CloseTableOnShard(CloseTableOnShardRequest)
      returns (CloseTableOnShardResponse) {}
  rpc SplitShard(SplitShardRequest) returns (SplitShardResponse) {}
  rpc MergeShards(MergeShardsRequest) returns (MergeShardsResponse) {}
  rpc ChangeShardRole(ChangeShardRoleRequest)
      returns (ChangeShardRoleResponse) {}
}

message UpdateShardInfo {
  meta_service.ShardInfo curr_shard_info = 1;
  // Deprecated: This field is deprecated.
  // Use version in ShardInfo to get the current version instead.
  uint64 prev_version = 2;
}

message OpenShardRequest {
  meta_service.ShardInfo shard = 1;
}

message OpenShardResponse {
  common.ResponseHeader header = 1;
}

message CloseShardRequest {
  uint32 shard_id = 1;
}

message CloseShardResponse {
  common.ResponseHeader header = 1;
}

message CreateTableOnShardRequest {
  UpdateShardInfo update_shard_info = 1;
  meta_service.TableInfo table_info = 2;
  bytes encoded_schema = 3;
  string engine = 4;
  bool create_if_not_exist = 5;
  map<string, string> options = 6;
}

message CreateTableOnShardResponse {
  common.ResponseHeader header = 1;
  uint64 latest_shard_version = 2;
}

message DropTableOnShardRequest {
  UpdateShardInfo update_shard_info = 1;
  meta_service.TableInfo table_info = 2;
}

message DropTableOnShardResponse {
  common.ResponseHeader header = 1;
  uint64 latest_shard_version = 2;
}

message OpenTableOnShardRequest {
  UpdateShardInfo update_shard_info = 1;
  meta_service.TableInfo table_info = 2;
}

message OpenTableOnShardResponse {
  common.ResponseHeader header = 1;
}

message CloseTableOnShardRequest {
  UpdateShardInfo update_shard_info = 1;
  meta_service.TableInfo table_info = 2;
}

message CloseTableOnShardResponse {
  common.ResponseHeader header = 1;
}

message SplitShardRequest {}

message SplitShardResponse {
  common.ResponseHeader header = 1;
}

message MergeShardsRequest {}

message MergeShardsResponse {
  common.ResponseHeader header = 1;
}

message ChangeShardRoleRequest {}

message ChangeShardRoleResponse {
  common.ResponseHeader header = 1;
}

message ShardLockValue {
  string node_name = 1;
}