syntax = "proto3";

package logproto;

option go_package = "github.com/grafana/loki/pkg/logproto";

import "google/protobuf/timestamp.proto";
import "gogo.proto";

service Pusher {
  rpc Push(PushRequest) returns (PushResponse) {};
}

service Querier {
  rpc Query(QueryRequest) returns (stream QueryResponse) {};
  rpc Label(LabelRequest) returns (LabelResponse) {};
  rpc Tail(TailRequest) returns (stream TailResponse) {};
  rpc Series(SeriesRequest) returns (SeriesResponse) {};
  rpc TailersCount(TailersCountRequest) returns (TailersCountResponse) {};
}

service Ingester {
  rpc TransferChunks(stream TimeSeriesChunk) returns (TransferChunksResponse) {};
}

message PushRequest {
  repeated StreamAdapter streams = 1 [(gogoproto.jsontag) = "streams", (gogoproto.customtype) = "Stream"];
}

message PushResponse {
}

message QueryRequest {
  string selector = 1;
  uint32 limit = 2;
  google.protobuf.Timestamp start = 3 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
  google.protobuf.Timestamp end = 4 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
  Direction direction = 5;
  reserved 6;
}

enum Direction {
  FORWARD = 0;
  BACKWARD = 1;
}

message QueryResponse {
  repeated StreamAdapter streams = 1 [(gogoproto.customtype) = "Stream", (gogoproto.nullable) = true];
}

message LabelRequest {
  string name = 1;
  bool values = 2; // True to fetch label values, false for fetch labels names.
  google.protobuf.Timestamp start = 3 [(gogoproto.stdtime) = true, (gogoproto.nullable) = true];
  google.protobuf.Timestamp end = 4 [(gogoproto.stdtime) = true, (gogoproto.nullable) = true];
}

message LabelResponse {
  repeated string values = 1;
}

message StreamAdapter {
  string labels = 1 [(gogoproto.jsontag) = "labels"];
  repeated EntryAdapter entries = 2 [(gogoproto.nullable) = false, (gogoproto.jsontag) = "entries"];
}

message EntryAdapter {
  google.protobuf.Timestamp timestamp = 1 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false, (gogoproto.jsontag) = "ts"];
  string line = 2 [(gogoproto.jsontag) = "line"];
}

message TailRequest {
  string query = 1;
  reserved 2;
  uint32 delayFor = 3;
  uint32 limit = 4;
  google.protobuf.Timestamp start = 5 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
}

message TailResponse {
  StreamAdapter stream = 1 [(gogoproto.customtype) = "Stream"];
  repeated DroppedStream droppedStreams = 2;
}

message SeriesRequest {
  google.protobuf.Timestamp start = 1 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
  google.protobuf.Timestamp end = 2 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
  repeated string groups = 3;
}

message SeriesResponse {
  repeated SeriesIdentifier series = 1 [(gogoproto.nullable) = false];
}

message SeriesIdentifier {
  map<string,string> labels = 1;
}

message DroppedStream {
  google.protobuf.Timestamp from = 1 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
  google.protobuf.Timestamp to = 2 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
  string labels = 3;
}

message TimeSeriesChunk {
  string from_ingester_id = 1;
  string user_id = 2;
  repeated LabelPair labels = 3;
  repeated Chunk chunks = 4;
}

message LabelPair {
  string name = 1;
  string value = 2;
}

message Chunk {
  bytes data = 1;
}

message TransferChunksResponse {

}

message TailersCountRequest {

}

message TailersCountResponse {
  uint32 count = 1;
}