/*
 * Copyright (C) 2017 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.
 */

syntax = "proto2";

package android.drm_metrics;


// This message contains the specific metrics captured by DrmMetrics. It is
// used for serializing and logging metrics.
// next id: 11.
message DrmFrameworkMetrics {
  // TODO: Consider using extensions.

  // Attributes are associated with a recorded value. E.g. A counter may
  // represent a count of an operation returning a specific error code. The
  // error code will be an attribute.
  message Attributes {
    // Reserved for compatibility with logging proto.
    reserved 2 to 13;

    // A general purpose error code where 0 means OK.
    optional int32 error_code = 1;

    // Defined at ::android::hardware::drm::V1_0::KeyStatusType;
    optional uint32 key_status_type = 14;

    // Defined at ::android::hardware::drm::V1_0::EventType;
    optional uint32 event_type = 15;
  }

  // The Counter message is used to store a count value with an associated
  // Attribute.
  message Counter {
    optional uint64 count = 1;
    // Represents the attributes associated with this counter instance.
    optional Attributes attributes = 2;
  }

  // The DistributionMetric is meant to capture the moments of a normally
  // distributed (or approximately normal) value.
  message DistributionMetric {
    optional float min = 1;
    optional float max = 2;
    optional float mean = 3;
    optional double variance = 4;
    optional uint64 operation_count = 5;

    // Represents the attributes assocated with this distribution metric
    // instance.
    optional Attributes attributes = 6;
  }

  message SessionLifetime {
    // Start time of the session in milliseconds since epoch.
    optional uint64 start_time_ms = 1;
    // End time of the session in milliseconds since epoch.
    optional uint64 end_time_ms = 2;
  }

  // The count of open session operations. Each instance has a specific error
  // code associated with it.
  repeated Counter open_session_counter = 1;

  // The count of close session operations. Each instance has a specific error
  // code associated with it.
  repeated Counter close_session_counter = 2;

  // Count and execution time of getKeyRequest calls.
  repeated DistributionMetric get_key_request_time_us = 3;

  // Count and execution time of provideKeyResponse calls.
  repeated DistributionMetric provide_key_response_time_us = 4;

  // Count of getProvisionRequest calls.
  repeated Counter get_provisioning_request_counter = 5;

  // Count of provideProvisionResponse calls.
  repeated Counter provide_provisioning_response_counter = 6;

  // Count of key status events broken out by status type.
  repeated Counter key_status_change_counter = 7;

  // Count of events broken out by event type
  repeated Counter event_callback_counter = 8;

  // Count getPropertyByteArray calls to retrieve the device unique id.
  repeated Counter get_device_unique_id_counter = 9;

  // Session ids to lifetime (start and end time) map.
  // Session ids are strings of hex-encoded byte arrays.
  map<string, SessionLifetime> session_lifetimes = 10;
}