syntax = "proto3";

// 微服务通过 ws_channel 与 efka 之间的通道消息定义。
// 该协议用于替代当前基于 JSON 的请求/响应/推送格式。

message ServiceRequest {
  uint64 packet_id = 1;

  message Register {
    string service_id = 1;
  }

  message Subscribe {
    string topic = 1;
  }

  oneof request {
    Register register = 10;
    Subscribe subscribe = 11;
  }
}

message ServiceReply {
  uint64 packet_id = 1;

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

  oneof reply {
    bytes result = 10;
    Error error = 11;
  }
}

message ServiceCast {

  message MetricData {
    bytes route_key = 1;
    bytes metric = 2;
  }

  message TopicEvent {
    string topic = 1;
    bytes content = 2;
  }

  oneof body {
    TopicEvent topic_event = 10;
    MetricData metric_data = 11;
  }

}