syntax = "proto3";

option go_package = "bitbucket.org/innius/grafana-simple-grpc-datasource/v2";

import "google/protobuf/timestamp.proto";

package grafanav2;

// The GrafanaQueryAPI definition.
service GrafanaQueryAPI {
  // Returns a list of all available dimensions
  rpc ListDimensionKeys (ListDimensionKeysRequest) returns (ListDimensionKeysResponse) {
  }

  // Returns a list of all dimension values for a certain dimension
  rpc ListDimensionValues (ListDimensionValuesRequest) returns (ListDimensionValuesResponse) {
  }

  // Returns all metrics from the system
  rpc ListMetrics (ListMetricsRequest) returns (ListMetricsResponse) {
  }

  // Gets the last known value for one or more metrics
  rpc GetMetricValue (GetMetricValueRequest) returns (GetMetricValueResponse) {
  }

  // Gets the history for one or more metrics
  rpc GetMetricHistory (GetMetricHistoryRequest) returns (GetMetricHistoryResponse) {
  }

  // Gets the history for one or more metrics
  rpc GetMetricAggregate(GetMetricAggregateRequest) returns (GetMetricAggregateResponse) {
  }
}

message ListMetricsRequest {
  repeated Dimension dimensions = 1;
  string filter = 2;
}

message ListMetricsResponse {
  message Metric {
    string name = 1;
    string description = 2;
  }
  repeated Metric Metrics = 1;
}

message GetMetricValueRequest {
  repeated Dimension dimensions = 1;

  repeated string metrics = 2;
}

message GetMetricValueResponse {
  message Frame {
    string metric = 1;

    google.protobuf.Timestamp timestamp = 2;

    repeated SingleValueField fields = 3;

    FrameMeta meta = 4;
  }

  repeated Frame frames = 1;
}

message GetMetricAggregateRequest {
  // The dimensions for the query
  repeated Dimension dimensions = 1;

  // the metrics for which the aggregates are retrieved
  repeated string metrics = 2;

  AggregateType aggregateType = 3;
  google.protobuf.Timestamp startDate = 4;
  google.protobuf.Timestamp endDate = 5;
  int64 maxItems = 6;
  TimeOrdering timeOrdering = 7;
  string startingToken = 8;
  int64 intervalMs = 9;
}

message GetMetricAggregateResponse {
  repeated Frame frames = 1;

  string nextToken = 2;
}

message GetMetricHistoryRequest {
  repeated Dimension dimensions = 3;
  repeated string metrics = 4;
  google.protobuf.Timestamp startDate = 5;
  google.protobuf.Timestamp endDate = 6;
  int64 maxItems = 7;
  TimeOrdering timeOrdering = 8;
  string startingToken = 9;
}

message GetMetricHistoryResponse {
  repeated Frame frames = 1;

  string nextToken = 2;
}

message Label {
  string key = 1;
  string value = 2;
}

message Field {
  string name = 1;

  repeated Label labels = 2;

  config config = 3;

  repeated double values = 4;
}

message ValueMapping {
  double from = 1;
  double to = 2; 
  string value = 3; 
  string text = 4;
  string color = 5;
}

message config {
  string unit = 1;

  repeated ValueMapping Mappings = 2;
}

message SingleValueField {
  string name = 1;

  repeated Label labels = 2;

  config config = 3;

  double value = 4;
}

// The data frame for each metric
message Frame {
  string metric = 1;

  repeated google.protobuf.Timestamp timestamps = 2;

  repeated Field fields = 3;

  FrameMeta meta = 4;
}

// FrameMeta matches:
// https://github.com/grafana/grafana/blob/master/packages/grafana-data/src/types/data.ts#L11
// NOTE -- in javascript this can accept any `[key: string]: any;` however
// this interface only exposes the values we want to be exposed
message FrameMeta {
  enum FrameType {
    FrameTypeUnknown = 0;
    FrameTypeTimeSeriesWide = 1;
    FrameTypeTimeSeriesLong = 2;
    FrameTypeTimeSeriesMany = 3;
    FrameTypeDirectoryListing = 4;
    FrameTypeTable = 5;
  }
  // Type asserts that the frame matches a known type structure
  FrameType type = 1 ;

  message Notice {
    enum NoticeSeverity {
      // NoticeSeverityInfo is informational severity.
      NoticeSeverityInfo = 0;
      // NoticeSeverityWarning is warning severity.
      NoticeSeverityWarning = 1;
      // NoticeSeverityError is error severity.
      NoticeSeverityError = 3;
    }
    // Severity is the severity level of the notice: info, warning, or error.
    NoticeSeverity Severity = 1;

    // Text is freeform descriptive text for the notice.
    string text = 2;

    // Link is an optional link for display in the user interface and can be an
    // absolute URL or a path relative to Grafana's root url.
    string link = 3;

    enum InspectType {
      // InspectTypeNone is no suggestion for a tab of the panel editor in Grafana's user interface.
      InspectTypeNone = 0;

      // InspectTypeMeta suggests the "meta" tab of the panel editor in Grafana's user interface.
      InspectTypeMeta = 1;

      // InspectTypeError suggests the "error" tab of the panel editor in Grafana's user interface.
      InspectTypeError = 2;

      // InspectTypeData suggests the "data" tab of the panel editor in Grafana's user interface.
      InspectTypeData = 3;

      // InspectTypeStats suggests the "stats" tab of the panel editor in Grafana's user interface.
      InspectTypeStats = 4;
    }
    // Inspect is an optional suggestion for which tab to display in the panel inspector
    // in Grafana's User interface. Can be meta, error, data, or stats.
    InspectType inspect = 4;
  }
  // Notices provide additional information about the data in the Frame that
  // Grafana can display to the user in the user interface.
  repeated Notice  Notices = 6;

  // VisType is used to indicate how the data should be visualized in explore.
  enum VisType {
    // VisTypeGraph indicates the response should be visualized using a graph.
    VisTypeGraph = 0;

    // VisTypeTable indicates the response should be visualized using a table.
    VisTypeTable = 1;

    // VisTypeLogs indicates the response should be visualized using a logs visualization.
    VisTypeLogs = 2;

    // VisTypeTrace indicates the response should be visualized using a trace view visualization.
    VisTypeTrace = 3;

    // VisTypeNodeGraph indicates the response should be visualized using a node graph visualization.
    VisTypeNodeGraph = 4;
  }

  // PreferredVisualization is currently used to show results in Explore only in preferred visualisation option.
  VisType PreferredVisualization = 8;

  // ExecutedQueryString is the raw query sent to the underlying system. All macros and templating
  // have been applied.  When metadata contains this value, it will be shown in the query inspector.
  string executedQueryString = 9;
}

enum TimeOrdering {
  ASCENDING = 0;
  DESCENDING = 1;
}

enum AggregateType {
  AVERAGE = 0;
  MAX = 1;
  MIN = 2;
  COUNT = 3;
}

message ListDimensionKeysRequest {
  string filter = 1;
  repeated Dimension selected_dimensions = 2;
}

message ListDimensionKeysResponse {
  message Result {
    string key = 1;
    string description = 2;
  }
  repeated Result results = 1;
}

message ListDimensionValuesRequest {
  string dimension_key = 1;
  string filter = 2;
  repeated Dimension selected_dimensions = 3;
}

message ListDimensionValuesResponse {
  message Result {
    string value = 1;
    string description = 2;
  }
  repeated Result results = 1;
}

message TimeRange {
  int64 fromEpochMS = 1;
  int64 toEpochMS = 2;
}

message Dimension {
  string key = 1;
  string value = 2;
}

message QueryRequest {
  string refId = 1;
  int64 maxDataPoints = 2;
  int64 intervalMS = 3;
  TimeRange timeRange = 4;
  // The offset for the result set
  int64 startKey = 5;
  repeated Dimension dimensions = 6;
}

// The response message containing the greetings
message QueryResponse {
  string refId = 1;
  int64 nextKey = 2;
  message Value {
    int64 timestamp = 1;
    float value = 2;
  }
  repeated Value values = 3;
}