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(* Title: Pure/General/socket_io.ML
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Author: Timothy Bourke, NICTA
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Author: Makarius
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Stream IO over TCP sockets. Following example 10.2 in "The Standard
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ML Basis Library" by Emden R. Gansner and John H. Reppy.
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*)
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signature SOCKET_IO =
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sig
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val make_streams: Socket.active INetSock.stream_sock -> BinIO.instream * BinIO.outstream
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val open_streams: string -> BinIO.instream * BinIO.outstream
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end;
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structure Socket_IO: SOCKET_IO =
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struct
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fun make_streams socket =
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let
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val (host, port) = INetSock.fromAddr (Socket.Ctl.getSockName socket);
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val name = NetHostDB.toString host ^ ":" ^ string_of_int port;
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val rd =
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BinPrimIO.RD {
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name = name,
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chunkSize = Socket.Ctl.getRCVBUF socket,
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readVec = SOME (fn n => Socket.recvVec (socket, n)),
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readArr = SOME (fn buffer => Socket.recvArr (socket, buffer)),
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readVecNB = NONE,
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readArrNB = NONE,
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block = NONE,
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canInput = NONE,
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avail = fn () => NONE,
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getPos = NONE,
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setPos = NONE,
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endPos = NONE,
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verifyPos = NONE,
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close = fn () => Socket.close socket,
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ioDesc = NONE
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};
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val wr =
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BinPrimIO.WR {
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name = name,
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chunkSize = Socket.Ctl.getSNDBUF socket,
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writeVec = SOME (fn buffer => Socket.sendVec (socket, buffer)),
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writeArr = SOME (fn buffer => Socket.sendArr (socket, buffer)),
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writeVecNB = NONE,
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writeArrNB = NONE,
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block = NONE,
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canOutput = NONE,
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getPos = NONE,
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setPos = NONE,
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endPos = NONE,
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verifyPos = NONE,
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close = fn () => Socket.close socket,
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ioDesc = NONE
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};
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val in_stream =
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BinIO.mkInstream
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(BinIO.StreamIO.mkInstream (rd, Word8Vector.fromList []));
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val out_stream =
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BinIO.mkOutstream
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(BinIO.StreamIO.mkOutstream (wr, IO.BLOCK_BUF));
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in (in_stream, out_stream) end;
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fun open_streams socket_name =
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let
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fun err () = error ("Bad socket name: " ^ quote socket_name);
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val (host, port) =
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(case space_explode ":" socket_name of
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[h, p] =>
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(case NetHostDB.getByName h of SOME host => host | NONE => err (),
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case Int.fromString p of SOME port => port | NONE => err ())
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| _ => err ());
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val socket: Socket.active INetSock.stream_sock = INetSock.TCP.socket ();
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val _ = Socket.connect (socket, INetSock.toAddr (NetHostDB.addr host, port));
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in make_streams socket end;
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end;
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