syntax = "proto3";

package envoy.service.tap.v4alpha;

import "envoy/config/core/v4alpha/base.proto";
import "envoy/data/tap/v3/wrapper.proto";

import "udpa/annotations/status.proto";
import "udpa/annotations/versioning.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.service.tap.v4alpha";
option java_outer_classname = "TapProto";
option java_multiple_files = true;
option java_generic_services = true;
option (udpa.annotations.file_status).package_version_status = NEXT_MAJOR_VERSION_CANDIDATE;

// [#protodoc-title: Tap Sink Service]

// [#not-implemented-hide:] A tap service to receive incoming taps. Envoy will call
// StreamTaps to deliver captured taps to the server
service TapSinkService {
  // Envoy will connect and send StreamTapsRequest messages forever. It does not expect any
  // response to be sent as nothing would be done in the case of failure. The server should
  // disconnect if it expects Envoy to reconnect.
  rpc StreamTaps(stream StreamTapsRequest) returns (StreamTapsResponse) {
  }
}

// [#not-implemented-hide:] Stream message for the Tap API. Envoy will open a stream to the server
// and stream taps without ever expecting a response.
message StreamTapsRequest {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.service.tap.v3.StreamTapsRequest";

  message Identifier {
    option (udpa.annotations.versioning).previous_message_type =
        "envoy.service.tap.v3.StreamTapsRequest.Identifier";

    // The node sending taps over the stream.
    config.core.v4alpha.Node node = 1 [(validate.rules).message = {required: true}];

    // The opaque identifier that was set in the :ref:`output config
    // <envoy_api_field_config.tap.v4alpha.StreamingGrpcSink.tap_id>`.
    string tap_id = 2;
  }

  // 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;

  // The trace id. this can be used to merge together a streaming trace. Note that the trace_id
  // is not guaranteed to be spatially or temporally unique.
  uint64 trace_id = 2;

  // The trace data.
  data.tap.v3.TraceWrapper trace = 3;
}

// [#not-implemented-hide:]
message StreamTapsResponse {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.service.tap.v3.StreamTapsResponse";
}