// 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;

import "greptime/v1/meta/common.proto";

option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/meta";

service Lock {
  // Lock acquires a distributed shared lock on a given named lock. On success,
  // it will return a unique key that exists so long as the lock is held by the
  // caller.
  rpc Lock(LockRequest) returns (LockResponse);

  // Unlock takes a key returned by Lock and releases the hold on lock.
  rpc Unlock(UnlockRequest) returns (UnlockResponse);
}

message LockRequest {
  RequestHeader header = 1;

  // Name is the identifier for the distributed shared lock to be acquired.
  bytes name = 2;

  // If the expiration time is exceeded and currently holds the lock, the lock
  // is automatically released.
  int64 expire_secs = 3;
}

message LockResponse {
  ResponseHeader header = 1;

  // Key will exist as long as lock is held by the caller.
  bytes key = 2;
}

message UnlockRequest {
  RequestHeader header = 1;

  // key is the lock ownership key granted by Lock.
  bytes key = 2;
}

message UnlockResponse {
  ResponseHeader header = 1;
}