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221 | -- Fixed length message services implementing using GNAT.Sockets UDP
-- Must be instantiated for each message size.
-- Copyright (C)2017-2023, Philip Munts dba Munts Technologies.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
WITH Ada.Exceptions;
WITH Ada.Strings.Fixed;
WITH Ada.Streams;
WITH GNAT.Sockets;
USE TYPE Ada.Streams.Stream_Element_Offset;
USE TYPE GNAT.Sockets.Sock_Addr_Type;
PACKAGE BODY Messaging.Fixed.GNAT_UDP IS
-- UDP client (initiator) constructor
FUNCTION Create
(server : String;
port : Positive;
timeoutms : Integer := 1000) RETURN Messaging.Fixed.Messenger IS
socket : GNAT.Sockets.Socket_Type;
peer : GNAT.Sockets.Sock_Addr_Type;
BEGIN
BEGIN
peer.Addr := GNAT.Sockets.Inet_Addr(server);
EXCEPTION
WHEN GNAT.Sockets.Socket_Error =>
peer.Addr :=
GNAT.Sockets.Addresses(GNAT.Sockets.Get_Host_By_Name(server));
END;
peer.Port := GNAT.Sockets.Port_Type(port);
GNAT.Sockets.Create_Socket(socket, GNAT.Sockets.Family_Inet,
GNAT.Sockets.Socket_Datagram);
IF timeoutms > 0 THEN
GNAT.Sockets.Set_Socket_Option(socket, GNAT.Sockets.Socket_Level,
(GNAT.Sockets.Receive_Timeout, Timeout => Duration(timeoutms)/1000.0));
END IF;
RETURN NEW MessengerSubclass'(socket, peer);
END Create;
-- UDP client (initiator) transmit service
PROCEDURE Send(Self : MessengerSubclass; msg : Message) IS
Data : Ada.Streams.Stream_Element_Array(0 .. Message'Length - 1);
Last : Ada.Streams.Stream_Element_Offset;
BEGIN
IF Self.peer = GNAT.Sockets.No_Sock_Addr THEN
RAISE GNAT.Sockets.Socket_Error WITH "Cannot call this method from server";
END IF;
FOR i IN Data'Range LOOP
Data(i) := Ada.Streams.Stream_Element(msg(Integer(i)));
END LOOP;
GNAT.Sockets.Send_Socket(Self.socket, Data, Last, Self.peer);
IF Natural(Last) + 1 /= Message'Length THEN
RAISE GNAT.Sockets.Socket_Error WITH "Short write";
END IF;
END Send;
-- UDP client (initiator) receive service
PROCEDURE Receive(Self : MessengerSubclass; msg : OUT Message) IS
Data : Ada.Streams.Stream_Element_Array(0 .. Message'Length - 1);
Last : Ada.Streams.Stream_Element_Offset;
From : GNAT.Sockets.Sock_Addr_Type;
BEGIN
IF Self.peer = GNAT.Sockets.No_Sock_Addr THEN
RAISE GNAT.Sockets.Socket_Error WITH "Cannot call this method from server";
END IF;
GNAT.Sockets.Receive_Socket(Self.socket, Data, Last, From);
IF Natural(Last) + 1 /= Message'Length THEN
RAISE GNAT.Sockets.Socket_Error WITH "Short read";
END IF;
IF From /= Self.peer THEN
RAISE GNAT.Sockets.Socket_Error WITH "Message not from server node";
END IF;
FOR i IN Data'Range LOOP
msg(Integer(i)) := Messaging.Byte(Data(i));
END LOOP;
EXCEPTION
WHEN E : GNAT.Sockets.Socket_Error =>
IF Ada.Strings.Fixed.Head(Ada.Exceptions.Exception_Message(E), 4) = "[11]" THEN
RAISE Messaging.Timeout_Error;
ELSE
RAISE;
END IF;
END Receive;
-- UDP server (responder) constructor
PROCEDURE Initialize_Server
(Self : IN OUT MessengerSubclass;
netiface : String := "0.0.0.0"; -- Bind to all available network interfaces
port : Positive;
timeoutms : Integer := 1000) IS
iface : GNAT.Sockets.Sock_Addr_Type;
socket : GNAT.Sockets.Socket_Type;
BEGIN
iface.Addr := GNAT.Sockets.Inet_Addr(netiface);
iface.Port := GNAT.Sockets.Port_Type(port);
GNAT.Sockets.Create_Socket(socket, GNAT.Sockets.Family_Inet,
GNAT.Sockets.Socket_Datagram);
-- Bind the server socket to network interface(s)
GNAT.Sockets.Bind_Socket(socket, iface);
-- Set receive timeout, if requested
IF timeoutms > 0 THEN
GNAT.Sockets.Set_Socket_Option(socket, GNAT.Sockets.Socket_Level,
(GNAT.Sockets.Receive_Timeout, Timeout => Duration(timeoutms)/1000.0));
END IF;
Self := MessengerSubclass'(socket, GNAT.Sockets.No_Sock_Addr);
END Initialize_Server;
-- UDP server (responder) transmit service
PROCEDURE Send_Server
(Self : MessengerSubclass;
dst : PeerIdentifier;
msg : Message) IS
Data : Ada.Streams.Stream_Element_Array(0 .. Message'Length - 1);
Last : Ada.Streams.Stream_Element_Offset;
To : GNAT.Sockets.Sock_Addr_Type;
BEGIN
To := GNAT.Sockets.Sock_Addr_type(dst);
FOR i IN Data'Range LOOP
Data(i) := Ada.Streams.Stream_Element(msg(Integer(i)));
END LOOP;
GNAT.Sockets.Send_Socket(Self.socket, Data, Last, To);
IF Natural(Last) + 1 /= Message'Length THEN
RAISE GNAT.Sockets.Socket_Error WITH "Short write";
END IF;
END Send_Server;
-- UDP server (responder) receive service
PROCEDURE Receive_Server
(Self : MessengerSubclass;
src : OUT PeerIdentifier;
msg : OUT Message) IS
Data : Ada.Streams.Stream_Element_Array(0 .. Message'Length - 1);
Last : Ada.Streams.Stream_Element_Offset;
From : GNAT.Sockets.Sock_Addr_Type;
BEGIN
GNAT.Sockets.Receive_Socket(Self.socket, Data, Last, From);
IF Natural(Last) + 1 /= Message'Length THEN
RAISE GNAT.Sockets.Socket_Error WITH "Short read";
END IF;
FOR i IN Data'Range LOOP
msg(Integer(i)) := Messaging.Byte(Data(i));
END LOOP;
src := PeerIdentifier(From);
EXCEPTION
WHEN E : GNAT.Sockets.Socket_Error =>
IF Ada.Strings.Fixed.Head(Ada.Exceptions.Exception_Message(E), 4) = "[11]" THEN
RAISE Messaging.Timeout_Error;
ELSE
RAISE;
END IF;
END Receive_Server;
-- Retrieve the underlying Linux file descriptor
FUNCTION fd(Self : MessengerSubclass) RETURN Integer IS
BEGIN
RETURN GNAT.Sockets.To_C(Self.socket);
END fd;
END Messaging.Fixed.GNAT_UDP;
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