feat: move_value & delete_route (#707)

* feat: move_value & delete_route

* chore: minor refactor

* chore: refactor unit test of metaclient

* chore: map to kv

* Update src/meta-srv/src/service/router.rs

Co-authored-by: Yingwen <realevenyag@gmail.com>

* Update src/meta-srv/src/service/router.rs

Co-authored-by: Yingwen <realevenyag@gmail.com>

* chore: by code review

Co-authored-by: Yingwen <realevenyag@gmail.com>

src/api/greptime/v1/meta/route.proto

@@ -5,6 +5,8 @@ package greptime.v1.meta;
 import "greptime/v1/meta/common.proto";
 
 service Router {
+  rpc Create(CreateRequest) returns (RouteResponse) {}
+
   // Fetch routing information for tables. The smallest unit is the complete
   // routing information(all regions) of a table.
   // 
@@ -26,7 +28,14 @@ service Router {
   //
   rpc Route(RouteRequest) returns (RouteResponse) {}
 
-  rpc Create(CreateRequest) returns (RouteResponse) {}
+  rpc Delete(DeleteRequest) returns (RouteResponse) {}
+}
+
+message CreateRequest {
+  RequestHeader header = 1;
+
+  TableName table_name = 2;
+  repeated Partition partitions = 3;
 }
 
 message RouteRequest {
@@ -35,6 +44,12 @@ message RouteRequest {
   repeated TableName table_names = 2;
 }
 
+message DeleteRequest {
+  RequestHeader header = 1;
+
+  TableName table_name = 2; 
+}
+
 message RouteResponse {
   ResponseHeader header = 1;
 
@@ -42,13 +57,6 @@ message RouteResponse {
   repeated TableRoute table_routes = 3;
 }
 
-message CreateRequest {
-  RequestHeader header = 1;
-
-  TableName table_name = 2;
-  repeated Partition partitions = 3;
-}
-
 message TableRoute {
   Table table = 1;
   repeated RegionRoute region_routes = 2;

src/api/greptime/v1/meta/store.proto

@@ -20,6 +20,9 @@ service Store {
 
   // DeleteRange deletes the given range from the key-value store.
   rpc DeleteRange(DeleteRangeRequest) returns (DeleteRangeResponse);
+
+  // MoveValue atomically renames the key to the given updated key.
+  rpc MoveValue(MoveValueRequest) returns (MoveValueResponse);
 }
 
 message RangeRequest {
@@ -136,3 +139,21 @@ message DeleteRangeResponse {
   // returned.
   repeated KeyValue prev_kvs = 3;
 }
+
+message MoveValueRequest {
+  RequestHeader header = 1;
+
+  // If from_key dose not exist, return the value of to_key (if it exists).
+  // If from_key exists, move the value of from_key to to_key (i.e. rename),
+  // and return the value.
+  bytes from_key = 2;
+  bytes to_key = 3;
+}
+
+message MoveValueResponse {
+  ResponseHeader header = 1;
+
+  // If from_key dose not exist, return the value of to_key (if it exists).
+  // If from_key exists, return the value of from_key.
+  KeyValue kv = 2;
+}

src/api/src/v1/meta.rs

@@ -145,10 +145,12 @@ gen_set_header!(HeartbeatRequest);
 gen_set_header!(RouteRequest);
 gen_set_header!(CreateRequest);
 gen_set_header!(RangeRequest);
+gen_set_header!(DeleteRequest);
 gen_set_header!(PutRequest);
 gen_set_header!(BatchPutRequest);
 gen_set_header!(CompareAndPutRequest);
 gen_set_header!(DeleteRangeRequest);
+gen_set_header!(MoveValueRequest);
 
 #[cfg(test)]
 mod tests {