// 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;

import "greptime/v1/common.proto";

option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1";
option java_outer_classname = "Prometheus";
option java_package = "io.greptime.v1";

// PrometheusGateway behaves absolutely the same as Prometheus HTTP API
service PrometheusGateway {
  rpc Handle(PromqlRequest) returns (PromqlResponse);
}

message PromqlRequest {
  RequestHeader header = 1;
  oneof promql {
    PromInstantQuery instant_query = 2;
    PromRangeQuery range_query = 3;
  }
}

message PromqlResponse {
  ResponseHeader header = 1;
  bytes body = 2; // absolutely same format as Prometheus in JSON
}

message PromInstantQuery {
  string query = 1;
  string time = 2;
  string lookback = 3;
}

message PromRangeQuery {
  string query = 1;
  string start = 2;
  string end = 3;
  string step = 4;
  string lookback = 5;
}