syntax = "proto3";

package envoy.service.trace.v2;

import "envoy/api/v2/core/base.proto";

import "google/api/annotations.proto";

import "opencensus/proto/trace/v1/trace.proto";

import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.service.trace.v2";
option java_outer_classname = "TraceServiceProto";
option java_multiple_files = true;
option java_generic_services = true;

// Service for streaming traces to server that consumes the trace data. It
// uses OpenCensus data model as a standard to represent trace information.
service TraceService {
  // Envoy will connect and send StreamTracesMessage messages forever. It does
  // not expect any response to be sent as nothing would be done in the case
  // of failure.
  rpc StreamTraces(stream StreamTracesMessage) returns (StreamTracesResponse) {
  }
}

message StreamTracesResponse {
}

message StreamTracesMessage {
  message Identifier {
    // The node sending the access log messages over the stream.
    api.v2.core.Node node = 1 [(validate.rules).message = {required: true}];
  }

  // Identifier data effectively is a structured metadata.
  // As a performance optimization this will only be sent in the first message
  // on the stream.
  Identifier identifier = 1;

  // A list of Span entries
  repeated opencensus.proto.trace.v1.Span spans = 2;
}