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// This file defines an interface for exporting monitoring information
// out of gRPC servers.
syntax = "proto3";

// TODO(ericgribkoff) Figure out how to manage the external Census proto
// dependency.
import "tools/grpcz/census.proto";
import "tools/grpcz/empty.proto";
import "tools/grpcz/any.proto";

package grpc.instrumentation.v1alpha;

option java_multiple_files = true;
option java_package = "io.grpc.instrumentation.v1alpha";
option java_outer_classname = "MonitoringProto";

service Monitoring {
  // Return canonical RPC stats
  rpc GetCanonicalRpcStats(google.protobuf.Empty) returns (CanonicalRpcStats) {
  }

  // Query the server for specific stats
  rpc GetStats(StatsRequest) returns (StatsResponse) {
    // TODO(aveitch, ericgribkoff): Pease define the stats response message
    // StatsRequest would specifically identify the stats to be returned.
  }

  // Request the server to stream back snapshots of the requested stats
  rpc WatchStats(StatsRequest) returns (stream StatsResponse) {
  }


  // Return request traces.
  rpc GetRequestTraces(TraceRequest) returns(TraceResponse) {
  // TODO(aveitch): Please define the messages here
  }

  // Return application-defined groups of monitoring data.
  // This is a low level facility to allow extension of the monitoring API to
  // application-specific monitoring data. Frameworks may use this to define
  // additional groups of monitoring data made available by servers.
  rpc GetCustomMonitoringData(MonitoringDataGroup)
    returns (CustomMonitoringData) {
  }

}

// Canonical RPC stats exported by gRPC.
message CanonicalRpcStats {
  // Wrapper combining View and ViewDescriptor.
  message View {
    google.instrumentation.MeasurementDescriptor measurement_descriptor = 1;
    google.instrumentation.ViewDescriptor view_descriptor = 2;
    google.instrumentation.View view = 3;
  }

  View rpc_client_errors = 1;
  View rpc_client_completed_rpcs = 2;
  View rpc_client_started_rpcs = 3;
  View rpc_client_elapsed_time = 4;
  View rpc_client_server_elapsed_time = 5;
  View rpc_client_request_bytes = 6;
  View rpc_client_response_bytes = 7;
  View rpc_client_request_count = 8;
  View rpc_client_response_count = 9;
  View rpc_server_errors = 10;
  View rpc_server_completed_rpcs = 11;
  View rpc_server_server_elapsed_time = 12;
  View rpc_server_request_bytes = 13;
  View rpc_server_response_bytes = 14;
  View rpc_server_request_count = 15;
  View rpc_server_response_count = 16;
  View rpc_server_elapsed_time = 17;
  //TODO(ericgribkoff) Add minute-hour interval stats.
}

message StatsRequest {
  // TODO(aveitch): Complete definition of this type
}

message StatsResponse {
  // TODO(aveitch): Complete definition of this type
}

message TraceRequest {
  // TODO(aveitch): Complete definition of this type
}

message TraceResponse {
  // TODO(aveitch): Complete definition of this type
}

message MonitoringDataGroup {
  string name = 1;  // name of a group of monitoring data
}

// The wrapper for custom monitoring data.
message CustomMonitoringData {
  // can be any application specific monitoring data
  Any contents = 1;
}