/*
 * Copyright 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// The protobuf messages for lab host to export metadata and reosurce metrics.
syntax = "proto3";

package dual_home_lab.monitoring_agent.resource_monitoring;

import "google/protobuf/timestamp.proto";

option java_package = "com.google.dualhomelab.monitoringagent.resourcemonitoring";
option java_multiple_files = true;
option java_generic_services = true;

// A tag-value pair message represents the metric value.
// For example:
// To represent device disk used percentage.
// metric {
//   tag: "/data"
//   value: 20.5
// }
message Metric {
  // A string tag associates to the value.
  string tag = 1;
  // A float value represents the resource value.
  float value = 2;
}

// A message that describes the resource and its metrics.
// For example:
// To represent disk space usage values at certain moment.
// resource {
//   resource_name: "disk_space"
//   resource_instance: "/data"
//   timestamp {
//     seconds: 1589342214
//   }
//   metric: {
//     tag: "avail"
//     value: 20.5
//   }
//   metric: {
//     tag: "used"
//     value: 18.7
//   }
//   metric: {
//     tag: "reserved for root"
//     value: 16.2
//   }
// }
message Resource {
  // A string resource name. ex. "cpu", "memory", "disk_space".
  string resource_name = 1;
  // A string reperesent the sub resource name.
  string resource_instance = 2;
  // The Metric describe the host or device resource usages.
  repeated Metric metric = 3;
  // The collecting timestamp.
  google.protobuf.Timestamp timestamp = 4;
}

// A name-value message to represent the metadata attribute.
// For example:
// To represent the run target.
// attribute {
//   name: "run_target"
//   value: "atom-userdebug"
// }
// To reperent the pools.
// attribute {
//   name: "pool"
//   value: "asit"
// }
// attribute {
//   name: "pool"
//   value: "apct"
// }
message Attribute {
  string name = 1;
  string value = 2;
}

// A message that describes the device state and resource usages.
// For example:
// To represent a monitored host
// host {
//   identifier: {
//     key: "lab_name"
//     value: "us-mtv43"
//   }
//   identifier: {
//     key: "host_name"
//     value: "foo.bar.com"
//   }
//   identifier: {
//     key: "test_harness"
//     value: "tradefed"
//   }
//   attribute: {... check the attribute example above ...}
//   resource: {... check the resource example abobe ...}
// }
// To represent a monitored device
// device {
//   identifier: {
//     key: "device_serial"
//     value: "VVEG-GIDSAN"
//   }
//   attribute: {... check the attribute example above ...}
//   resource: {... check the resource example abobe ...}
// }
message MonitoredEntity {
  // The string map that helps identify the monitored entity
  map<string, string> identifier = 1;
  // The attribute messages that describe the device metadata.
  repeated Attribute attribute = 2;
  // The resource messages that describe the device state and resource metrics.
  repeated Resource resource = 3;
}

// A message that describe the state and resource usages for a lab host and its
// connected devices.
message LabResource {
  MonitoredEntity host = 1;
  repeated MonitoredEntity device = 2;
}

// The request message to query the LabResource.
message LabResourceRequest {}

// The service which is intend to export device metrics and metadata to the host
// monitoring agent. The host monitoring agent is responsible for
// collecting host/device metrics and exporting the metrics to user defined
// cloud PubSub topics.
service LabResourceService {
  // Queries lab resource message.
  rpc GetLabResource(LabResourceRequest) returns (LabResource) {
    // The http equivalent is curl http://ADDRESS/v1/lab_resource_message
    // (Assuming your service is hosted at the given 'ADDRESS')
  }
}