syntax = "proto3";

package greptime.v1.meta;

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

message RequestHeader {
  uint64 protocol_version = 1;
  // cluster_id is the ID of the cluster which be sent to.
  uint64 cluster_id = 2;
  // member_id is the ID of the sender server.
  uint64 member_id = 3;
  Role role = 4;
}

enum Role {
  DATANODE = 0;
  FRONTEND = 1;
}

message ResponseHeader {
  uint64 protocol_version = 1;
  // cluster_id is the ID of the cluster which sent the response.
  uint64 cluster_id = 2;
  Error error = 3;
}

message Error {
  int32 code = 1;
  string err_msg = 2;
}

message Peer {
  uint64 id = 1;
  string addr = 2;
}

message TableName {
  string catalog_name = 1;
  string schema_name = 2;
  string table_name = 3;
}

message TimeInterval {
  // The unix timestamp in millis of the start of this period.
  int64 start_timestamp_millis = 1;
  // The unix timestamp in millis of the end of this period.
  int64 end_timestamp_millis = 2;
}

message KeyValue {
  // key is the key in bytes. An empty key is not allowed.
  bytes key = 1;
  // value is the value held by the key, in bytes.
  bytes value = 2;
}