syntax = "proto3";
package pdpb;

import "metapb.proto";

service PD {
    rpc Tso(stream TsoRequest) returns (stream TsoResponse) {}
    rpc AllocID(AllocIDRequest) returns (AllocIDResponse) {}
    rpc Heartbeat(stream HeartbeatRequest) returns (stream HeartbeatResponse) {}
}

message Member {
    // name is the name of the PD member.
    string name = 1;
    // member_id is the unique id of the PD member.
    uint64 member_id = 2;
    repeated string peer_urls = 3;
    repeated string client_urls = 4;
}

message RequestHeader {
    // cluster_id is the ID of the cluster which be sent to.
    uint64 cluster_id = 1;
}

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

enum ErrorType {
    OK = 0;
    UNKNOWN = 1;
    NOT_BOOTSTRAPPED = 2;
    STORE_TOMBSTONE = 3;
    ALREADY_BOOTSTRAPPED = 4;
    INCOMPATIBLE_VERSION = 5;
    REGION_NOT_FOUND = 6;
}

message Error {
    ErrorType type = 1;
    string message = 2;
}

message TsoRequest {
    RequestHeader header = 1;

    uint32 count = 2;
}

message Timestamp {
    int64 physical = 1;
    int64 logical = 2;
}

message TsoResponse {
    ResponseHeader header = 1;

    uint32 count = 2;
    Timestamp timestamp = 3;
}

message AllocIDRequest {
    RequestHeader header = 1;
}

message AllocIDResponse {
    ResponseHeader header = 1;
    uint64 id = 2;
}

message HeartbeatRequest {
    RequestHeader header = 1;
    metapb.Peer peer = 2;

}

message HeartbeatResponse {
    ResponseHeader header = 1;
}