// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Contains the definitions for a metrics service and the type of metrics
// exposed by the service.
//
// Currently, 'Gauge' (i.e a metric that represents the measured value of
// something at an instant of time) is the only metric type supported by the
// service.
syntax = "proto3";

package grpc.testing;

// Reponse message containing the gauge name and value
message GaugeResponse {
  string name = 1;
  oneof value {
    int64 long_value = 2;
    double double_vale = 3;
    string string_value = 4;
  }
}

// Request message containing the gauge name
message GaugeRequest {
  string name = 1;
}

message EmptyMessage {}

service MetricsService {
  // Returns the values of all the gauges that are currently being maintained by
  // the service
  rpc GetAllGauges(EmptyMessage) returns (stream GaugeResponse);

  // Returns the value of one gauge
  rpc GetGauge(GaugeRequest) returns (GaugeResponse);
}