syntax = "proto3";

package conduit.public;

import "google/protobuf/duration.proto";

import "common/common.proto";

enum MetricName {
  REQUEST_RATE = 0;
  LATENCY = 1;
  SUCCESS_RATE = 2;
}

enum TimeWindow {
  TEN_SEC = 0;
  ONE_MIN = 1;
  TEN_MIN = 2;
  ONE_HOUR = 3;
}

enum AggregationType {
  TARGET_POD = 0;
  TARGET_DEPLOY = 1;
  SOURCE_POD = 2;
  SOURCE_DEPLOY = 3;
  MESH = 4;
  PATH = 5;
}

enum HistogramLabel {
  MIN = 0;
  P50 = 1;
  P95 = 2;
  P99 = 3;
  MAX = 4;
}

message HistogramValue {
  HistogramLabel label = 1;
  int64 value = 2;
}

message Histogram {
  repeated HistogramValue values = 1;
}

message MetricValue {
  oneof value {
    int64 counter = 1;
    double gauge = 2;
    Histogram histogram = 3;
  }
}

message MetricDatapoint {
  MetricValue value = 1;
  int64 timestamp_ms = 2;
}

message MetricSeries {
  MetricName name = 1;
  MetricMetadata metadata = 2;
  repeated MetricDatapoint datapoints = 3;
}

message MetricMetadata {
  string targetPod = 1;
  string targetDeploy = 2;
  string sourcePod = 3;
  string sourceDeploy = 4;
  string component = 5;
  string path = 6;
}

message MetricResponse {
  repeated MetricSeries metrics = 1;
}

message MetricRequest {
  repeated MetricName metrics = 1;
  TimeWindow window = 2;
  AggregationType groupBy = 3;
  MetricMetadata filterBy = 4;
  bool summarize = 5;
}

message Empty {}

message VersionInfo {
  string goVersion = 1;
  string buildDate = 2;
  string releaseVersion = 3;
}

message ListPodsResponse {
  repeated Pod pods = 1;
}

message Pod {
  string name = 1;
  string podIP = 2;
  string deployment = 3;
  string status = 4;
  bool added = 5; // true if this pod has a proxy sidecar (data plane)
  google.protobuf.Duration sinceLastReport = 6;
  string controllerNamespace = 7; // namespace of contoller this pod reports to
  bool controlPlane = 8; // true if this pod is part of the control plane
}

message TapRequest {
  oneof target {
    string pod = 1;
    string deployment = 2;
  }
  // validation of these fields happens on the server
  float maxRps = 3;
  uint32 toPort = 4;
  string toIP = 5;
  uint32 fromPort = 6;
  string fromIP = 7;
  string scheme = 8;
  string method = 9;
  string authority = 10;
  string path = 11;
}

message ApiError {
  string error = 1;
}

service Api {
  rpc Stat(MetricRequest) returns (MetricResponse) {}
  rpc Version(Empty) returns (VersionInfo) {}
  rpc ListPods(Empty) returns (ListPodsResponse) {}
  rpc Tap(TapRequest) returns (stream common.TapEvent) {}
}