syntax = "proto3";

package healthchecker;

option go_package = "git.ipng.ch/ipng/vpp-maglev/internal/grpcapi";

// HealthChecker exposes the state of backend health for all VIPs.
service HealthChecker {
  rpc ListVIPs(ListVIPsRequest) returns (ListVIPsResponse);
  rpc GetVIP(GetVIPRequest) returns (VIPInfo);
  rpc ListBackends(ListBackendsRequest) returns (ListBackendsResponse);
  rpc GetBackend(GetBackendRequest) returns (BackendInfo);
  rpc PauseBackend(PauseResumeRequest) returns (BackendInfo);
  rpc ResumeBackend(PauseResumeRequest) returns (BackendInfo);
  rpc WatchTransitions(WatchRequest) returns (stream TransitionEvent);
}

// ---- requests ---------------------------------------------------------------

message ListVIPsRequest {}

message GetVIPRequest {
  string vip_name = 1;
}

message ListBackendsRequest {
  string vip_name = 1;
}

message GetBackendRequest {
  string vip_name = 1;
  string backend_address = 2;
}

message PauseResumeRequest {
  string vip_name = 1;
  string backend_address = 2;
}

message WatchRequest {}

// ---- responses --------------------------------------------------------------

message ListVIPsResponse {
  repeated string vip_names = 1;
}

message VIPInfo {
  string name = 1;
  string address = 2;
  string protocol = 3;
  uint32 port = 4;
  repeated string backends = 5;
  string description = 6;
}

message ListBackendsResponse {
  repeated BackendInfo backends = 1;
}

message BackendInfo {
  string vip_name = 1;
  string address = 2;
  string state = 3;
  repeated TransitionRecord transitions = 4;
}

message TransitionRecord {
  string from = 1;
  string to = 2;
  int64 at_unix_ns = 3;
}

message TransitionEvent {
  string vip_name = 1;
  string backend_address = 2;
  TransitionRecord transition = 3;
}