syntax = "proto3";

import "google/protobuf/timestamp.proto";

option go_package = "/proto";

package management;

service FlowService {
  // Client to receiver streams of events and acknowledgements
  rpc Events(stream FlowEvent) returns (stream FlowEventAck) {}
}

message FlowEvent {
  // Unique client event identifier
  string event_id = 1;

  // Unique client flow session identifier
  string flow_id = 2;

  // When the event occurred
  google.protobuf.Timestamp timestamp = 3;

  // Public key of the sending peer
  bytes public_key = 4;

  EventFields event_fields = 5;
}

message FlowEventAck {
  // Unique client event identifier that has been ack'ed
  string event_id = 1;
}

message EventFields {
  // Event type
  Type type = 1;

  // Initiating traffic direction
  Direction direction = 2;

  // IP protocol number
  uint32 protocol = 3;

  // Source IP address
  bytes source_ip = 4;

  // Destination IP address
  bytes dest_ip = 5;

  // Layer 4 -specific information
  oneof connection_info {
    // TCP/UDP port information
    PortInfo port_info = 6;

    // ICMP type and code
    ICMPInfo icmp_info = 7;
  }
}

// Flow event types
enum Type {
  TYPE_UNKNOWN = 0;
  TYPE_START = 1;
  TYPE_END = 2;
}

// Flow direction
enum Direction {
  DIRECTION_UNKNOWN = 0;
  INGRESS = 1;
  EGRESS = 2;
}

// TCP/UDP port information
message PortInfo {
  uint32 source_port = 1;
  uint32 dest_port = 2;
}

// ICMP message information
message ICMPInfo {
  uint32 icmp_type = 1;
  uint32 icmp_code = 2;
}