2 * \file ServerSocket.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Lars Gullik Bjønnes
7 * \author Jean-Marc Lasgouttes
8 * \author Angus Leeming
10 * \author João Luis M. Assirati
12 * Full author contact details are available in file CREDITS.
17 #include "ServerSocket.h"
19 #include "DispatchResult.h"
20 #include "FuncRequest.h"
22 #include "LyXAction.h"
24 #include "frontends/Application.h"
26 #include "support/debug.h"
27 #include "support/environment.h"
28 #include "support/FileName.h"
29 #include "support/socktools.h"
31 #include "support/bind.h"
41 using namespace lyx::support;
47 // Address is the unix address for the socket.
48 // MAX_CLIENTS is the maximum number of clients
49 // that can connect at the same time.
50 ServerSocket::ServerSocket(FileName const & addr)
51 : fd_(socktools::listen(addr, 3)),
55 LYXERR(Debug::LYXSERVER, "lyx: Disabling LyX socket.");
59 // These env vars are used by DVI inverse search
61 setEnv("XEDITOR", "lyxclient -g %f %l");
62 // Needed by lyxclient
63 setEnv("LYXSOCKET", address_.absFileName());
65 theApp()->registerSocketCallback(
67 bind(&ServerSocket::serverCallback, this)
70 LYXERR(Debug::LYXSERVER, "lyx: New server socket "
71 << fd_ << ' ' << address_.absFileName());
75 // Close the socket and remove the address of the filesystem.
76 ServerSocket::~ServerSocket()
79 BOOST_ASSERT (theApp());
80 theApp()->unregisterSocketCallback(fd_);
81 if (::close(fd_) != 0)
82 lyxerr << "lyx: Server socket " << fd_
83 << " IO error on closing: " << strerror(errno)
86 address_.removeFile();
87 LYXERR(Debug::LYXSERVER, "lyx: Server socket quitting");
91 string const ServerSocket::address() const
93 return address_.absFileName();
97 // Creates a new LyXDataSocket and checks to see if the connection
98 // is OK and if the number of clients does not exceed MAX_CLIENTS
99 void ServerSocket::serverCallback()
101 int const client_fd = socktools::accept(fd_);
104 LYXERR(Debug::LYXSERVER, "lyx: Failed to accept new client");
108 if (clients.size() >= MAX_CLIENTS) {
109 writeln("BYE:Too many clients connected");
113 // Register the new client.
115 shared_ptr<LyXDataSocket>(new LyXDataSocket(client_fd));
116 theApp()->registerSocketCallback(
118 bind(&ServerSocket::dataCallback,
124 // Reads and processes input from client and check
125 // if the connection has been closed
126 void ServerSocket::dataCallback(int fd)
128 shared_ptr<LyXDataSocket> client = clients[fd];
132 bool saidbye = false;
133 while (!saidbye && client->readln(line)) {
134 // The protocol must be programmed here
135 // Split the key and the data
136 if ((pos = line.find(':')) == string::npos) {
137 client->writeln("ERROR:" + line + ":malformed message");
141 string const key = line.substr(0, pos);
142 if (key == "LYXCMD") {
143 string const cmd = line.substr(pos + 1);
145 theApp()->dispatch(lyxaction.lookupFunc(cmd), dr);
146 theApp()->dispatch(FuncRequest(LFUN_PARAGRAPH_UPDATE));
147 string const rval = to_utf8(dr.message());
149 client->writeln("ERROR:" + cmd + ':' + rval);
151 client->writeln("INFO:" + cmd + ':' + rval);
152 } else if (key == "HELLO") {
153 // no use for client name!
154 client->writeln("HELLO:");
155 } else if (key == "BYE") {
158 client->writeln("ERROR:unknown key " + key);
162 if (saidbye || !client->connected()) {
168 void ServerSocket::writeln(string const & line)
170 string const linen = line + '\n';
171 int const size = linen.size();
172 int const written = ::write(fd_, linen.c_str(), size);
173 if (written < size) { // Always mean end of connection.
174 if (written == -1 && errno == EPIPE) {
175 // The program will also receive a SIGPIPE
176 // that must be caught
177 lyxerr << "lyx: Server socket " << fd_
178 << " connection closed while writing." << endl;
180 // Anything else, including errno == EAGAIN, must be
181 // considered IO error. EAGAIN should never happen
182 // when line is small
183 lyxerr << "lyx: Server socket " << fd_
184 << " IO error: " << strerror(errno);
190 // void ServerSocket::dump() const
192 // lyxerr << "ServerSocket debug dump.\n"
193 // << "fd = " << fd_ << ", address = " << address_.absFileName() << ".\n"
194 // << "Clients: " << clients.size() << ".\n";
195 // map<int, shared_ptr<LyXDataSocket> >::const_iterator client = clients.begin();
196 // map<int, shared_ptr<LyXDataSocket> >::const_iterator end = clients.end();
197 // for (; client != end; ++client)
198 // lyxerr << "fd = " << client->first << '\n';
202 LyXDataSocket::LyXDataSocket(int fd)
203 : fd_(fd), connected_(true)
205 LYXERR(Debug::LYXSERVER, "lyx: New data socket " << fd_);
209 LyXDataSocket::~LyXDataSocket()
211 if (::close(fd_) != 0)
212 lyxerr << "lyx: Data socket " << fd_
213 << " IO error on closing: " << strerror(errno);
215 theApp()->unregisterSocketCallback(fd_);
216 LYXERR(Debug::LYXSERVER, "lyx: Data socket " << fd_ << " quitting.");
220 bool LyXDataSocket::connected() const
226 // Returns true if there was a complete line to input
227 bool LyXDataSocket::readln(string & line)
229 int const charbuf_size = 100;
230 char charbuf[charbuf_size]; // buffer for the ::read() system call
233 // read and store characters in buffer
234 while ((count = ::read(fd_, charbuf, charbuf_size - 1)) > 0) {
235 buffer_.append(charbuf, charbuf + count);
238 // Error conditions. The buffer must still be
239 // processed for lines read
240 if (count == 0) { // EOF -- connection closed
241 LYXERR(Debug::LYXSERVER, "lyx: Data socket " << fd_
242 << ": connection closed.");
244 } else if ((count == -1) && (errno != EAGAIN)) { // IO error
245 lyxerr << "lyx: Data socket " << fd_
246 << ": IO error." << endl;
250 // Cut a line from buffer
251 size_t pos = buffer_.find('\n');
252 if (pos == string::npos) {
253 LYXERR(Debug::LYXSERVER, "lyx: Data socket " << fd_
254 << ": line not completed.");
255 return false; // No complete line stored
257 line = buffer_.substr(0, pos);
258 buffer_.erase(0, pos + 1);
263 // Write a line of the form <key>:<value> to the socket
264 void LyXDataSocket::writeln(string const & line)
266 string const linen = line + '\n';
267 int const size = linen.size();
268 int const written = ::write(fd_, linen.c_str(), size);
269 if (written < size) { // Always mean end of connection.
270 if (written == -1 && errno == EPIPE) {
271 // The program will also receive a SIGPIPE
272 // that must be catched
273 lyxerr << "lyx: Data socket " << fd_
274 << " connection closed while writing." << endl;
276 // Anything else, including errno == EAGAIN, must be
277 // considered IO error. EAGAIN should never happen
278 // when line is small
279 lyxerr << "lyx: Data socket " << fd_
280 << " IO error: " << strerror(errno);