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https://git.lyx.org/repos/lyx.git
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efe0b0b8eb
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@2254 a592a061-630c-0410-9148-cb99ea01b6c8
573 lines
15 KiB
C
573 lines
15 KiB
C
/* This file is part of
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* ======================================================
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*
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* LyX, The Document Processor
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*
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* Copyright 1995 Matthias Ettrich
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* Copyright 1995-2001 The LyX Team.
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*
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* ====================================================== */
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/**
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Docu : To use the lyxserver define the name of the pipe in your
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lyxrc:
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\serverpipe "/home/myhome/.lyxpipe"
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Then use .lyxpipe.in and .lyxpipe.out to communicate to LyX.
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Each message consists of a single line in ASCII. Input lines
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(client -> LyX) have the following format:
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"LYXCMD:<clientname>:<functionname>:<argument>"
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Answers from LyX look like this:
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"INFO:<clientname>:<functionname>:<data>"
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[asierra970531] Or like this in case of error:
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"ERROR:<clientname>:<functionname>:<error message>"
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where <clientname> and <functionname> are just echoed.
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If LyX notifies about a user defined extension key-sequence,
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the line looks like this:
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"NOTIFY:<key-sequence>"
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[asierra970531] New server-only messages to implement a simple protocol
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"LYXSRV:<clientname>:<protocol message>"
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where <protocol message> can be "hello" or "bye". If hello is
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received LyX will inform the client that it's listening its
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messages, and 'bye' will inform that lyx is closing.
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See development/server_monitor.c for an example client.
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Purpose: implement a client/server lib for LyX
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*/
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#include <config.h>
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//#include <cstring>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <cerrno>
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#include FORMS_H_LOCATION
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#ifdef __GNUG__
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#pragma implementation
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#endif
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#include "lyxserver.h"
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#include "lyx_main.h"
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#include "debug.h"
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#include "LyXAction.h"
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#include "lyxfunc.h"
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#include "support/lstrings.h"
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#include "support/lyxlib.h"
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#ifdef __EMX__
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#include <cstdlib>
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#include <io.h>
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#define OS2EMX_PLAIN_CHAR
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#define INCL_DOSNMPIPES
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#define INCL_DOSERRORS
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#include <os2.h>
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#include "os2_errortable.h"
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#endif
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using std::endl;
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// provide an empty mkfifo() if we do not have one. This disables the
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// lyxserver.
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#ifndef HAVE_MKFIFO
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int mkfifo(char const * __path, mode_t __mode) {
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return 0;
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}
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#endif
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/* === variables ========================================================= */
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extern LyXAction lyxaction;
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// C wrapper
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extern "C" void C_LyXComm_callback(int fd, void *v);
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// LyXComm class
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// Open pipes
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void LyXComm::openConnection() {
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lyxerr[Debug::LYXSERVER] << "LyXComm: Opening connection" << endl;
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// If we are up, that's an error
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if (ready) {
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lyxerr << "LyXComm: Already connected" << endl;
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return;
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}
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// We assume that we don't make it
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ready = false;
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if (pipename.empty()) return;
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// --- prepare input pipe ---------------------------------------
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string tmp = pipename + ".in";
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#ifdef __EMX__
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HPIPE fd;
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APIRET rc;
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int errnum;
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// Try create one instance of named pipe with the mode O_RDONLY|O_NONBLOCK.
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// The current emx implementation of access() won't work with pipes.
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rc = DosCreateNPipe(tmp.c_str(), &fd, NP_ACCESS_INBOUND,
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NP_NOWAIT|0x01, 0600, 0600, 0);
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if (rc == ERROR_PIPE_BUSY) {
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#else
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if (::access(tmp.c_str(), F_OK) == 0) {
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#endif
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lyxerr << "LyXComm: Pipe " << tmp << " already exists.\n"
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<< "If no other LyX program is active, please delete"
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" the pipe by hand and try again." << endl;
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pipename.erase();
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return;
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}
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#ifndef __EMX__
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if (::mkfifo(tmp.c_str(), 0600) < 0) {
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lyxerr << "LyXComm: Could not create pipe " << tmp << '\n'
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<< strerror(errno) << endl;
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return;
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};
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infd = ::open(tmp.c_str(), O_RDONLY|O_NONBLOCK);
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#else
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if (rc != NO_ERROR) {
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errnum = TranslateOS2Error(rc);
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lyxerr <<"LyXComm: Could not create pipe " << tmp
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<< strerror(errnum) << endl;
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return;
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};
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// Listen to it.
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rc = DosConnectNPipe(fd);
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if (rc != NO_ERROR && rc != ERROR_PIPE_NOT_CONNECTED) {
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errnum = TranslateOS2Error(rc);
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lyxerr <<"LyXComm: Could not create pipe " << tmp
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<< strerror(errnum) << endl;
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return;
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};
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// Imported handles can be used both with OS/2 APIs and emx
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// library functions.
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infd = _imphandle(fd);
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#endif
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if (infd < 0) {
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lyxerr << "LyXComm: Could not open pipe " << tmp << '\n'
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<< strerror(errno) << endl;
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return;
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}
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fl_add_io_callback(infd, FL_READ, C_LyXComm_callback, this);
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// --- prepare output pipe ---------------------------------------
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tmp = pipename + ".out";
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#ifndef __EMX__
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if (::access(tmp.c_str(), F_OK) == 0) {
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#else
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rc = DosCreateNPipe(tmp.c_str(), &fd, NP_ACCESS_DUPLEX,
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NP_NOWAIT|0x01, 0600, 0600, 0);
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if (rc == ERROR_PIPE_BUSY) {
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#endif
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lyxerr << "LyXComm: Pipe " << tmp << " already exists.\n"
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<< "If no other LyX program is active, please delete"
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" the pipe by hand and try again." << endl;
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pipename.erase();
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return;
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}
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#ifndef __EMX__
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if (::mkfifo(tmp.c_str(), 0600) < 0) {
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lyxerr << "LyXComm: Could not create pipe " << tmp << '\n'
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<< strerror(errno) << endl;
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return;
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};
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if (::access(tmp.c_str(), F_OK) != 0) {
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lyxerr << "LyXComm: Pipe " << tmp
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<< " does not exist" << endl;
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return;
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}
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outfd = ::open(tmp.c_str(), O_RDWR);
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#else
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if (rc != NO_ERROR) {
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errnum = TranslateOS2Error(rc);
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lyxerr << "LyXComm: Could not create pipe " << tmp << '\n'
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<< strerror(errnum) << endl;
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return;
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}
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rc = DosConnectNPipe(fd);
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if (rc == ERROR_BAD_PIPE) {
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lyxerr << "LyXComm: Pipe " << tmp
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<< " does not exist" << endl;
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return;
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}
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if (rc != NO_ERROR && rc != ERROR_PIPE_NOT_CONNECTED) {
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errnum = TranslateOS2Error(rc);
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lyxerr << "LyXComm: Could not create pipe " << tmp << '\n'
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<< strerror(errnum) << endl;
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return;
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}
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outfd = _imphandle(fd);
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#endif
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if (outfd < 0) {
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lyxerr << "LyXComm: Could not open pipe " << tmp << '\n'
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<< strerror(errno) << endl;
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return;
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}
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if (fcntl(outfd, F_SETFL, O_NONBLOCK) < 0) {
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lyxerr << "LyXComm: Could not set flags on pipe " << tmp
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<< '\n' << strerror(errno) << endl;
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return;
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};
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// We made it!
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ready = true;
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lyxerr[Debug::LYXSERVER] << "LyXComm: Connection established" << endl;
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}
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/// Close pipes
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void LyXComm::closeConnection() {
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#ifdef __EMX__
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APIRET rc;
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int errnum;
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#endif
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lyxerr[Debug::LYXSERVER] << "LyXComm: Closing connection" << endl;
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if (pipename.empty()) {
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return;
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}
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if (!ready) {
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lyxerr << "LyXComm: Already disconnected" << endl;
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return;
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}
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if (infd > -1) {
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fl_remove_io_callback(infd, FL_READ, C_LyXComm_callback);
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string tmp = pipename + ".in";
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#ifdef __EMX__ // Notify the operating system.
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rc = DosDisConnectNPipe(infd);
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if (rc != NO_ERROR) {
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errnum = TranslateOS2Error(rc);
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lyxerr << "LyXComm: Could not disconnect pipe " << tmp
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<< '\n' << strerror(errnum) << endl;
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return;
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}
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#endif
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if (close(infd) < 0) {
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lyxerr << "LyXComm: Could not close pipe " << tmp
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<< '\n' << strerror(errno) << endl;
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}
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#ifndef __EMX__ // OS/2 named pipes will be automatically removed.
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if (lyx::unlink(tmp) < 0){
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lyxerr << "LyXComm: Could not remove pipe " << tmp
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<< '\n' << strerror(errno) << endl;
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};
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#endif
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}
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if (outfd > -1) {
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string tmp = pipename + ".out";
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#ifdef __EMX__
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rc = DosDisConnectNPipe(outfd);
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if (rc != NO_ERROR) {
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errnum = TranslateOS2Error(rc);
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lyxerr << "LyXComm: Could not disconnect pipe " << tmp
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<< '\n' << strerror(errnum) << endl;
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return;
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}
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#endif
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if (::close(outfd) < 0) {
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lyxerr << "LyXComm: Could not close pipe " << tmp
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<< '\n' << strerror(errno) << endl;
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}
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#ifndef __EMX__
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if (lyx::unlink(tmp) < 0){
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lyxerr << "LyXComm: Could not remove pipe " << tmp
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<< '\n' << strerror(errno) << endl;
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};
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#endif
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}
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ready = false;
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}
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// Receives messages and sends then to client
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void LyXComm::callback(int fd, void *v)
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{
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LyXComm * c = static_cast<LyXComm*>(v);
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if (lyxerr.debugging(Debug::LYXSERVER)) {
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lyxerr << "LyXComm: Receiving from fd " << fd << endl;
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}
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const int CMDBUFLEN = 100;
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char charbuf[CMDBUFLEN];
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string cmd;
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// nb! make lsbuf a class-member for multiple sessions
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static string lsbuf;
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errno = 0;
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int status;
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// the single = is intended here.
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while((status = read(fd, charbuf, CMDBUFLEN-1)))
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{// break and return in loop
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if (status > 0) // got something
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{
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charbuf[status]= '\0'; // turn it into a c string
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lsbuf += strip(charbuf, '\r');
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// commit any commands read
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while(lsbuf.find('\n') != string::npos) // while still
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// commands
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// left
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{
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// split() grabs the entire string if
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// the delim /wasn't/ found. ?:-P
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lsbuf= split(lsbuf, cmd,'\n');
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lyxerr[Debug::LYXSERVER]
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<< "LyXComm: status:" << status
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<< ", lsbuf:" << lsbuf
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<< ", cmd:" << cmd << endl;
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if (!cmd.empty())
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c->clientcb(c->client, cmd);
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//\n or not \n?
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}
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}
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if (errno == EAGAIN)
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{ // EAGAIN is not really an error , it means we're
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// only reading too fast for the writing process on
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// the other end of the pipe.
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errno = 0;
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return; // up to libforms select-loop (*crunch*)
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}
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if (errno != 0 )
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{
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lyxerr << "LyXComm: " << strerror(errno) << endl;
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if (!lsbuf.empty())
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{
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lyxerr << "LyxComm: truncated command: "
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<< lsbuf << endl;
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lsbuf.erase();
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}
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break; // reset connection
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}
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}
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c->closeConnection();
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c->openConnection();
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errno= 0;
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}
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extern "C" void C_LyXComm_callback(int fd, void *v)
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{
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LyXComm::callback(fd, v);
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}
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void LyXComm::send(string const & msg) {
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if (msg.empty()) {
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lyxerr << "LyXComm: Request to send empty string. Ignoring."
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<< endl;
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return;
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}
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if (lyxerr.debugging(Debug::LYXSERVER)) {
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lyxerr << "LyXComm: Sending '" << msg << '\'' << endl;
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}
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if (pipename.empty()) return;
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if (!ready) {
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lyxerr << "LyXComm: Pipes are closed. Could not send "
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<< msg << endl;
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} else if (::write(outfd, msg.c_str(), msg.length()) < 0) {
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lyxerr << "LyXComm: Error sending message: " << msg
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<< '\n' << strerror(errno)
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<< "\nLyXComm: Resetting connection" << endl;
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closeConnection();
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openConnection();
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}
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#ifdef __EMX__
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APIRET rc;
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int errnum;
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rc = DosResetBuffer(outfd); // To avoid synchronization problems.
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if (rc != NO_ERROR) {
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errnum = TranslateOS2Error(rc);
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lyxerr << "LyXComm: Message could not be flushed: " << msg
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<< '\n' << strerror(errnum) << endl;
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}
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#endif
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}
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// LyXServer class
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LyXServer::~LyXServer()
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{
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// say goodbye to clients so they stop sending messages
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// modified june 1999 by stefano@zool.su.se to send as many bye
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// messages as there are clients, each with client's name.
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string message;
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for (int i= 0; i<numclients; ++i) {
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message = "LYXSRV:" + clients[i] + ":bye\n";
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pipes.send(message);
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}
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}
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/* ---F+------------------------------------------------------------------ *\
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Function : ServerCallback
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Called by : LyXComm
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Purpose : handle data gotten from communication
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\* ---F------------------------------------------------------------------- */
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void LyXServer::callback(LyXServer * serv, string const & msg)
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{
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lyxerr[Debug::LYXSERVER] << "LyXServer: Received: '"
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<< msg << '\'' << endl;
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char const * p = msg.c_str();
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// --- parse the string --------------------------------------------
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//
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// Format: LYXCMD:<client>:<func>:<argstring>\n
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//
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bool server_only = false;
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while(*p) {
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// --- 1. check 'header' ---
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if (compare(p, "LYXSRV:", 7) == 0) {
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server_only = true;
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} else if (0 != compare(p, "LYXCMD:", 7)) {
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lyxerr << "LyXServer: Unknown request" << endl;
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return;
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}
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p += 7;
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// --- 2. for the moment ignore the client name ---
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string client;
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while(*p && *p != ':')
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client += char(*p++);
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if (*p == ':') ++p;
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if (!*p) return;
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// --- 3. get function name ---
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string cmd;
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while(*p && *p != ':')
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cmd += char(*p++);
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// --- 4. parse the argument ---
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string arg;
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if (!server_only && *p == ':' && *(++p)) {
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while(*p && *p != '\n')
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arg += char(*p++);
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if (*p) ++p;
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}
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lyxerr[Debug::LYXSERVER]
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<< "LyXServer: Client: '" << client
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<< "' Command: '" << cmd
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<< "' Argument: '" << arg << '\'' << endl;
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// --- lookup and exec the command ------------------
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if (server_only) {
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string buf;
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// return the greeting to inform the client that
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// we are listening.
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if (cmd == "hello") {
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// One more client
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if (serv->numclients == MAX_CLIENTS){ //paranoid check
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lyxerr[Debug::LYXSERVER]
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<< "LyXServer: too many clients..."
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<< endl;
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return;
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}
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int i= 0; //find place in clients[]
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while (!serv->clients[i].empty()
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&& i<serv->numclients)
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++i;
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serv->clients[i] = client;
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serv->numclients++;
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buf = "LYXSRV:" + client + ":hello\n";
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lyxerr[Debug::LYXSERVER]
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<< "LyXServer: Greeting "
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<< client << endl;
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serv->pipes.send(buf);
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} else if (cmd == "bye") {
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// If clients == 0 maybe we should reset the pipes
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// to prevent fake callbacks
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int i = 0; //look if client is registered
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for (; i < serv->numclients; ++i) {
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if (serv->clients[i] == client) break;
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}
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if (i < serv->numclients) {
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serv->numclients--;
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serv->clients[i].erase();
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lyxerr[Debug::LYXSERVER]
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<< "LyXServer: Client "
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<< client << " said goodbye"
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<< endl;
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} else {
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lyxerr[Debug::LYXSERVER]
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<< "LyXServer: ignoring bye messge from unregistered client"
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<< client << endl;
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}
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} else {
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lyxerr <<"LyXServer: Undefined server command "
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<< cmd << "." << endl;
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}
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return;
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}
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if (!cmd.empty()) {
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// which lyxfunc should we let it connect to?
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// The correct solution would be to have a
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// specialized (non-gui) BufferView. But how do
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// we do it now? Probably we should just let it
|
|
// connect to the lyxfunc in the single LyXView we
|
|
// support currently. (Lgb)
|
|
|
|
int action = lyxaction.LookupFunc(cmd);
|
|
//int action = -1;
|
|
string rval, buf;
|
|
|
|
if (action>= 0) {
|
|
rval = serv->func->dispatch(action, arg);
|
|
} else {
|
|
rval = "Unknown command";
|
|
}
|
|
|
|
//modified june 1999 stefano@zool.su.se:
|
|
//all commands produce an INFO or ERROR message
|
|
//in the output pipe, even if they do not return
|
|
//anything. See chapter 4 of Customization doc.
|
|
if (action<0 || serv->func->errorStat())
|
|
buf = "ERROR:";
|
|
else
|
|
buf = "INFO:";
|
|
buf += string(client) + ":" + cmd + ":" + rval + "\n";
|
|
serv->pipes.send(buf);
|
|
|
|
// !!! we don't do any error checking -
|
|
// if the client won't listen, the
|
|
// message is lost and others too
|
|
// maybe; so the client should empty
|
|
// the outpipe before issuing a request.
|
|
|
|
// not found
|
|
}
|
|
} /* while *p */
|
|
}
|
|
|
|
|
|
/* ---F+------------------------------------------------------------------ *\
|
|
Function : LyxNotifyClient
|
|
Called by : WorkAreaKeyPress
|
|
Purpose : send a notify messge to a client
|
|
Parameters: s - string to send
|
|
Returns : nothing
|
|
\* ---F------------------------------------------------------------------- */
|
|
|
|
void LyXServer::notifyClient(string const & s)
|
|
{
|
|
string buf = string("NOTIFY:") + s + "\n";
|
|
pipes.send(buf);
|
|
}
|
|
|