syntax = "proto3";

package proto;

option go_package = "osapi";
option java_multiple_files = true;
option java_outer_classname = "OsApi";
option java_package = "com.os.api";

import "google/protobuf/empty.proto";

// The OS service definition.
//
// OS Service also implements all the API of Init Service
service OS {
  rpc Containers(ContainersRequest) returns (ContainersReply);
  rpc Dmesg(google.protobuf.Empty) returns (DataReply);
  rpc Kubeconfig(google.protobuf.Empty) returns (DataReply);
  rpc Logs(LogsRequest) returns (stream Data);
  rpc Processes(google.protobuf.Empty) returns (ProcessesReply);
  rpc Restart(RestartRequest) returns (RestartReply);
  rpc Stats(StatsRequest) returns (StatsReply);
}

// Common metadata message nested in all reply message types
message NodeMetadata {
  string hostname = 1;
}

// rpc Containers

// The request message containing the containerd namespace.
enum ContainerDriver {
  CONTAINERD = 0;
  CRI = 1;
}

message ContainersRequest {
  string namespace = 1;
  // driver might be default "containerd" or "cri"
  ContainerDriver driver = 2;
}

// The response message containing the requested containers.
message Container {
  string namespace = 1;
  string id = 2;
  string image = 3;
  uint32 pid = 4;
  string status = 5;
  string pod_id = 6;
  string name = 7;
}

// The response message containing the requested containers.
message ContainerResponse {
  NodeMetadata metadata = 1;
  repeated Container containers = 2;
}

message ContainersReply {
  repeated ContainerResponse response = 1;
}

// rpc dmesg
// rpc kubeconfig

// The response message containing the requested logs.
message Data {
  bytes bytes = 1;
}

message DataResponse {
  NodeMetadata metadata = 1;
  Data bytes = 2;
}

message DataReply {
  repeated DataResponse response = 1;
}

// rpc logs

// The request message containing the process name.
message LogsRequest {
  string namespace = 1;
  string id = 2;
  // driver might be default "containerd" or "cri"
  ContainerDriver driver = 3;
}

// rpc processes
message ProcessesRequest {}

message ProcessesReply {
  repeated ProcessResponse response = 1;
}

message ProcessResponse {
  NodeMetadata metadata = 1;
  repeated Process processes = 2;
}

message Process {
  int32 pid = 1;
  int32 ppid = 2;
  string state = 3;
  int32 threads = 4;
  double cpu_time = 5;
  uint64 virtual_memory = 6;
  uint64 resident_memory = 7;
  string command = 8;
  string executable = 9;
  string args = 10;
}

// rpc restart
// The request message containing the process to restart.
message RestartRequest {
  string namespace = 1;
  string id = 2;
  // driver might be default "containerd" or "cri"
  ContainerDriver driver = 3;
}

message RestartResponse {
  NodeMetadata metadata = 1;
}

// The response message containing the restart status.
message RestartReply {
  repeated RestartResponse response = 1;
}

// rpc stats

// The request message containing the containerd namespace.
message StatsRequest {
  string namespace = 1;
  // driver might be default "containerd" or "cri"
  ContainerDriver driver = 2;
}

// The response message containing the requested stats.
message StatsResponse {
  NodeMetadata metadata = 1;
  repeated Stat stats = 2;
}

message StatsReply {
  repeated StatsResponse response = 1;
}

// The response message containing the requested stat.
message Stat {
  string namespace = 1;
  string id = 2;
  uint64 memory_usage = 4;
  uint64 cpu_usage = 5;
  string pod_id = 6;
  string name = 7;
}