syntax = "proto2";
option go_package = "socket";

package appengine;

message RemoteSocketServiceError {
  enum ErrorCode {
    SYSTEM_ERROR = 1;
    GAI_ERROR = 2;
    FAILURE = 4;
    PERMISSION_DENIED = 5;
    INVALID_REQUEST = 6;
    SOCKET_CLOSED = 7;
  }

  enum SystemError {
    option allow_alias = true;

    SYS_SUCCESS = 0;
    SYS_EPERM = 1;
    SYS_ENOENT = 2;
    SYS_ESRCH = 3;
    SYS_EINTR = 4;
    SYS_EIO = 5;
    SYS_ENXIO = 6;
    SYS_E2BIG = 7;
    SYS_ENOEXEC = 8;
    SYS_EBADF = 9;
    SYS_ECHILD = 10;
    SYS_EAGAIN = 11;
    SYS_EWOULDBLOCK = 11;
    SYS_ENOMEM = 12;
    SYS_EACCES = 13;
    SYS_EFAULT = 14;
    SYS_ENOTBLK = 15;
    SYS_EBUSY = 16;
    SYS_EEXIST = 17;
    SYS_EXDEV = 18;
    SYS_ENODEV = 19;
    SYS_ENOTDIR = 20;
    SYS_EISDIR = 21;
    SYS_EINVAL = 22;
    SYS_ENFILE = 23;
    SYS_EMFILE = 24;
    SYS_ENOTTY = 25;
    SYS_ETXTBSY = 26;
    SYS_EFBIG = 27;
    SYS_ENOSPC = 28;
    SYS_ESPIPE = 29;
    SYS_EROFS = 30;
    SYS_EMLINK = 31;
    SYS_EPIPE = 32;
    SYS_EDOM = 33;
    SYS_ERANGE = 34;
    SYS_EDEADLK = 35;
    SYS_EDEADLOCK = 35;
    SYS_ENAMETOOLONG = 36;
    SYS_ENOLCK = 37;
    SYS_ENOSYS = 38;
    SYS_ENOTEMPTY = 39;
    SYS_ELOOP = 40;
    SYS_ENOMSG = 42;
    SYS_EIDRM = 43;
    SYS_ECHRNG = 44;
    SYS_EL2NSYNC = 45;
    SYS_EL3HLT = 46;
    SYS_EL3RST = 47;
    SYS_ELNRNG = 48;
    SYS_EUNATCH = 49;
    SYS_ENOCSI = 50;
    SYS_EL2HLT = 51;
    SYS_EBADE = 52;
    SYS_EBADR = 53;
    SYS_EXFULL = 54;
    SYS_ENOANO = 55;
    SYS_EBADRQC = 56;
    SYS_EBADSLT = 57;
    SYS_EBFONT = 59;
    SYS_ENOSTR = 60;
    SYS_ENODATA = 61;
    SYS_ETIME = 62;
    SYS_ENOSR = 63;
    SYS_ENONET = 64;
    SYS_ENOPKG = 65;
    SYS_EREMOTE = 66;
    SYS_ENOLINK = 67;
    SYS_EADV = 68;
    SYS_ESRMNT = 69;
    SYS_ECOMM = 70;
    SYS_EPROTO = 71;
    SYS_EMULTIHOP = 72;
    SYS_EDOTDOT = 73;
    SYS_EBADMSG = 74;
    SYS_EOVERFLOW = 75;
    SYS_ENOTUNIQ = 76;
    SYS_EBADFD = 77;
    SYS_EREMCHG = 78;
    SYS_ELIBACC = 79;
    SYS_ELIBBAD = 80;
    SYS_ELIBSCN = 81;
    SYS_ELIBMAX = 82;
    SYS_ELIBEXEC = 83;
    SYS_EILSEQ = 84;
    SYS_ERESTART = 85;
    SYS_ESTRPIPE = 86;
    SYS_EUSERS = 87;
    SYS_ENOTSOCK = 88;
    SYS_EDESTADDRREQ = 89;
    SYS_EMSGSIZE = 90;
    SYS_EPROTOTYPE = 91;
    SYS_ENOPROTOOPT = 92;
    SYS_EPROTONOSUPPORT = 93;
    SYS_ESOCKTNOSUPPORT = 94;
    SYS_EOPNOTSUPP = 95;
    SYS_ENOTSUP = 95;
    SYS_EPFNOSUPPORT = 96;
    SYS_EAFNOSUPPORT = 97;
    SYS_EADDRINUSE = 98;
    SYS_EADDRNOTAVAIL = 99;
    SYS_ENETDOWN = 100;
    SYS_ENETUNREACH = 101;
    SYS_ENETRESET = 102;
    SYS_ECONNABORTED = 103;
    SYS_ECONNRESET = 104;
    SYS_ENOBUFS = 105;
    SYS_EISCONN = 106;
    SYS_ENOTCONN = 107;
    SYS_ESHUTDOWN = 108;
    SYS_ETOOMANYREFS = 109;
    SYS_ETIMEDOUT = 110;
    SYS_ECONNREFUSED = 111;
    SYS_EHOSTDOWN = 112;
    SYS_EHOSTUNREACH = 113;
    SYS_EALREADY = 114;
    SYS_EINPROGRESS = 115;
    SYS_ESTALE = 116;
    SYS_EUCLEAN = 117;
    SYS_ENOTNAM = 118;
    SYS_ENAVAIL = 119;
    SYS_EISNAM = 120;
    SYS_EREMOTEIO = 121;
    SYS_EDQUOT = 122;
    SYS_ENOMEDIUM = 123;
    SYS_EMEDIUMTYPE = 124;
    SYS_ECANCELED = 125;
    SYS_ENOKEY = 126;
    SYS_EKEYEXPIRED = 127;
    SYS_EKEYREVOKED = 128;
    SYS_EKEYREJECTED = 129;
    SYS_EOWNERDEAD = 130;
    SYS_ENOTRECOVERABLE = 131;
    SYS_ERFKILL = 132;
  }

  optional int32 system_error = 1 [default=0];
  optional string error_detail = 2;
}

message AddressPort {
  required int32 port = 1;
  optional bytes packed_address = 2;

  optional string hostname_hint = 3;
}


message CreateSocketRequest {
  enum SocketFamily {
    IPv4 = 1;
    IPv6 = 2;
  }

  enum SocketProtocol {
    TCP = 1;
    UDP = 2;
  }

  required SocketFamily family = 1;
  required SocketProtocol protocol = 2;

  repeated SocketOption socket_options = 3;

  optional AddressPort proxy_external_ip = 4;

  optional int32 listen_backlog = 5 [default=0];

  optional AddressPort remote_ip = 6;

  optional string app_id = 9;

  optional int64 project_id = 10;
}

message CreateSocketReply {
  optional string socket_descriptor = 1;

  optional AddressPort server_address = 3;

  optional AddressPort proxy_external_ip = 4;

  extensions 1000 to max;
}


message BindRequest {
  required string socket_descriptor = 1;
  required AddressPort proxy_external_ip = 2;
}

message BindReply {
  optional AddressPort proxy_external_ip = 1;
}


message GetSocketNameRequest {
  required string socket_descriptor = 1;
}

message GetSocketNameReply {
  optional AddressPort proxy_external_ip = 2;
}


message GetPeerNameRequest {
  required string socket_descriptor = 1;
}

message GetPeerNameReply {
  optional AddressPort peer_ip = 2;
}


message SocketOption {

  enum SocketOptionLevel {
    SOCKET_SOL_IP = 0;
    SOCKET_SOL_SOCKET = 1;
    SOCKET_SOL_TCP = 6;
    SOCKET_SOL_UDP = 17;
  }

  enum SocketOptionName {
    option allow_alias = true;

    SOCKET_SO_DEBUG = 1;
    SOCKET_SO_REUSEADDR = 2;
    SOCKET_SO_TYPE = 3;
    SOCKET_SO_ERROR = 4;
    SOCKET_SO_DONTROUTE = 5;
    SOCKET_SO_BROADCAST = 6;
    SOCKET_SO_SNDBUF = 7;
    SOCKET_SO_RCVBUF = 8;
    SOCKET_SO_KEEPALIVE = 9;
    SOCKET_SO_OOBINLINE = 10;
    SOCKET_SO_LINGER = 13;
    SOCKET_SO_RCVTIMEO = 20;
    SOCKET_SO_SNDTIMEO = 21;

    SOCKET_IP_TOS = 1;
    SOCKET_IP_TTL = 2;
    SOCKET_IP_HDRINCL = 3;
    SOCKET_IP_OPTIONS = 4;

    SOCKET_TCP_NODELAY = 1;
    SOCKET_TCP_MAXSEG = 2;
    SOCKET_TCP_CORK = 3;
    SOCKET_TCP_KEEPIDLE = 4;
    SOCKET_TCP_KEEPINTVL = 5;
    SOCKET_TCP_KEEPCNT = 6;
    SOCKET_TCP_SYNCNT = 7;
    SOCKET_TCP_LINGER2 = 8;
    SOCKET_TCP_DEFER_ACCEPT = 9;
    SOCKET_TCP_WINDOW_CLAMP = 10;
    SOCKET_TCP_INFO = 11;
    SOCKET_TCP_QUICKACK = 12;
  }

  required SocketOptionLevel level = 1;
  required SocketOptionName option = 2;
  required bytes value = 3;
}


message SetSocketOptionsRequest {
  required string socket_descriptor = 1;
  repeated SocketOption options = 2;
}

message SetSocketOptionsReply {
}

message GetSocketOptionsRequest {
  required string socket_descriptor = 1;
  repeated SocketOption options = 2;
}

message GetSocketOptionsReply {
  repeated SocketOption options = 2;
}


message ConnectRequest {
  required string socket_descriptor = 1;
  required AddressPort remote_ip = 2;
  optional double timeout_seconds = 3 [default=-1];
}

message ConnectReply {
  optional AddressPort proxy_external_ip = 1;

  extensions 1000 to max;
}


message ListenRequest {
  required string socket_descriptor = 1;
  required int32 backlog = 2;
}

message ListenReply {
}


message AcceptRequest {
  required string socket_descriptor = 1;
  optional double timeout_seconds = 2 [default=-1];
}

message AcceptReply {
  optional bytes new_socket_descriptor = 2;
  optional AddressPort remote_address = 3;
}


message ShutDownRequest {
  enum How {
    SOCKET_SHUT_RD = 1;
    SOCKET_SHUT_WR = 2;
    SOCKET_SHUT_RDWR = 3;
  }
  required string socket_descriptor = 1;
  required How how = 2;
  required int64 send_offset = 3;
}

message ShutDownReply {
}


message CloseRequest {
  required string socket_descriptor = 1;
  optional int64 send_offset = 2 [default=-1];
}

message CloseReply {
}


message SendRequest {
  required string socket_descriptor = 1;
  required bytes data = 2 [ctype=CORD];
  required int64 stream_offset = 3;
  optional int32 flags = 4 [default=0];
  optional AddressPort send_to = 5;
  optional double timeout_seconds = 6 [default=-1];
}

message SendReply {
  optional int32 data_sent = 1;
}


message ReceiveRequest {
  enum Flags {
    MSG_OOB = 1;
    MSG_PEEK = 2;
  }
  required string socket_descriptor = 1;
  required int32 data_size = 2;
  optional int32 flags = 3 [default=0];
  optional double timeout_seconds = 5 [default=-1];
}

message ReceiveReply {
  optional int64 stream_offset = 2;
  optional bytes data = 3 [ctype=CORD];
  optional AddressPort received_from = 4;
  optional int32 buffer_size = 5;
}


message PollEvent {

  enum PollEventFlag {
    SOCKET_POLLNONE = 0;
    SOCKET_POLLIN = 1;
    SOCKET_POLLPRI = 2;
    SOCKET_POLLOUT = 4;
    SOCKET_POLLERR = 8;
    SOCKET_POLLHUP = 16;
    SOCKET_POLLNVAL = 32;
    SOCKET_POLLRDNORM = 64;
    SOCKET_POLLRDBAND = 128;
    SOCKET_POLLWRNORM = 256;
    SOCKET_POLLWRBAND = 512;
    SOCKET_POLLMSG = 1024;
    SOCKET_POLLREMOVE = 4096;
    SOCKET_POLLRDHUP = 8192;
  };

  required string socket_descriptor = 1;
  required int32 requested_events = 2;
  required int32 observed_events = 3;
}

message PollRequest {
  repeated PollEvent events = 1;
  optional double timeout_seconds = 2 [default=-1];
}

message PollReply {
  repeated PollEvent events = 2;
}

message ResolveRequest {
  required string name = 1;
  repeated CreateSocketRequest.SocketFamily address_families = 2;
}

message ResolveReply {
  enum ErrorCode {
    SOCKET_EAI_ADDRFAMILY = 1;
    SOCKET_EAI_AGAIN = 2;
    SOCKET_EAI_BADFLAGS = 3;
    SOCKET_EAI_FAIL = 4;
    SOCKET_EAI_FAMILY = 5;
    SOCKET_EAI_MEMORY = 6;
    SOCKET_EAI_NODATA = 7;
    SOCKET_EAI_NONAME = 8;
    SOCKET_EAI_SERVICE = 9;
    SOCKET_EAI_SOCKTYPE = 10;
    SOCKET_EAI_SYSTEM = 11;
    SOCKET_EAI_BADHINTS = 12;
    SOCKET_EAI_PROTOCOL = 13;
    SOCKET_EAI_OVERFLOW = 14;
    SOCKET_EAI_MAX = 15;
  };

  repeated bytes packed_address = 2;
  optional string canonical_name = 3;
  repeated string aliases = 4;
}