-/***************************************************************************
- * Copyright (C) 2006 by Gerd v. Egidy *
- * gve@intra2net.com *
- * *
- * This library is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU Lesser General Public License version *
- * 2.1 as published by the Free Software Foundation. *
- * *
- * This library is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU Lesser General Public License for more details. *
- * *
- * You should have received a copy of the GNU Lesser General Public *
- * License along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
+/*
+Copyright (C) 2006 by Intra2net AG - Gerd v. Egidy
+
+The software in this package is distributed under the GNU General
+Public License version 2 (with a special exception described below).
+
+A copy of GNU General Public License (GPL) is included in this distribution,
+in the file COPYING.GPL.
+
+As a special exception, if other files instantiate templates or use macros
+or inline functions from this file, or you compile this file and link it
+with other works to produce a work based on this file, this file
+does not by itself cause the resulting work to be covered
+by the GNU General Public License.
+
+However the source code for this file must still be made available
+in accordance with section (3) of the GNU General Public License.
+
+This exception does not invalidate any other reasons why a work based
+on this file might be covered by the GNU General Public License.
+*/
#include <stdio.h>
#include <errno.h>
#include "socket_client.hxx"
#include "t2n_exception.hxx"
+#include "log.hxx"
using namespace std;
namespace libt2n
{
-socket_client_connection::socket_client_connection(const std::string& _server, int _port, int _max_retries)
+/// returns a closed connection if connection could not be established, call get_last_error_msg() for details
+socket_client_connection::socket_client_connection(int _port, const std::string& _server,
+ long long _connect_timeout_usec, int _max_retries,
+ std::ostream *_logstream, log_level_values _log_level)
: client_connection(), socket_handler(0,tcp_s)
{
max_retries=_max_retries;
+ connect_timeout_usec=_connect_timeout_usec;
server=_server;
port=_port;
- connect();
+ set_logging(_logstream,_log_level);
+
+ try
+ {
+ tcp_connect(max_retries);
+ }
+ catch (t2n_communication_error &e)
+ {
+ lastErrorMsg=e.what();
+ LOGSTREAM(debug,"tcp connect error: " << lastErrorMsg);
+ // FIXME: Don't call virtual function in constructor. Currently not dangerous but bad design.
+ close();
+ }
+
+ if (!connection::is_closed())
+ do_callbacks(new_connection);
}
-socket_client_connection::socket_client_connection(const std::string& _path, int _max_retries)
+/// returns a closed connection if connection could not be established, call get_last_error_msg() for details
+socket_client_connection::socket_client_connection(const std::string& _path,
+ long long _connect_timeout_usec, int _max_retries,
+ std::ostream *_logstream, log_level_values _log_level)
: client_connection(), socket_handler(0,unix_s)
{
max_retries=_max_retries;
+ connect_timeout_usec=_connect_timeout_usec;
path=_path;
- connect();
+ set_logging(_logstream,_log_level);
+
+ try
+ {
+ unix_connect(max_retries);
+ }
+ catch (t2n_communication_error &e)
+ {
+ lastErrorMsg=e.what();
+ LOGSTREAM(debug,"unix connect error: " << lastErrorMsg);
+ // FIXME: Don't call virtual function in constructor. Currently not dangerous
+ close();
+ }
+
+ if (!connection::is_closed())
+ do_callbacks(new_connection);
}
-void socket_client_connection::connect()
+/**
+ * Destructor. Closes an open connection.
+ */
+socket_client_connection::~socket_client_connection()
{
- if (get_type() == unix_s)
+ // Destructor of socket_handler will close the socket!
+}
+
+
+/// establish a connection via tcp
+void socket_client_connection::tcp_connect(int max_retries)
+{
+ struct sockaddr_in sock_addr;
+
+ sock_addr.sin_family = AF_INET;
+ sock_addr.sin_port = htons(port);
+
+ // find the target ip
+ if (inet_aton(server.c_str(),&sock_addr.sin_addr)==0)
{
- struct sockaddr_un unix_addr;
+ struct hostent *server_hent;
+ server_hent=gethostbyname(server.c_str());
+ if (server_hent == NULL)
+ throw t2n_connect_error(string("can't find server ")+server);
- unix_addr.sun_family = AF_UNIX;
- strcpy (unix_addr.sun_path, path.c_str());
+ memcpy(&sock_addr.sin_addr,server_hent->h_addr_list[0],sizeof(sock_addr.sin_addr));
+ }
- sock = socket(PF_UNIX, SOCK_STREAM, 0);
- if (!sock)
- throw t2n_connect_error(string("socket() error: ")+strerror(errno));
+ sock = socket(PF_INET, SOCK_STREAM, 0);
+ if (!sock)
+ throw t2n_connect_error(string("socket() error: ")+strerror(errno));
- if (::connect(sock,(struct sockaddr *) &unix_addr, sizeof(unix_addr)))
- throw t2n_connect_error(string("connect() error: ")+strerror(errno));
+ try
+ {
+ connect_with_timeout((struct sockaddr *) &sock_addr,sizeof(sock_addr));
}
- else if (get_type() == tcp_s)
+ catch (t2n_connect_error &e)
{
- struct sockaddr_in sock_addr;
+ // recurse if retries left
+ if (max_retries > 0)
+ {
+ LOGSTREAM(debug,"retrying connect after connect error");
+ tcp_connect(max_retries-1);
+ }
+ else
+ throw t2n_connect_error("no more retries left after connect error");
+ }
+}
+
+/// establish a connection via unix-socket
+void socket_client_connection::unix_connect(int max_retries)
+{
+ struct sockaddr_un unix_addr;
- sock_addr.sin_family = AF_INET;
- sock_addr.sin_port = htons(port);
+ unix_addr.sun_family = AF_UNIX;
+ strcpy (unix_addr.sun_path, path.c_str());
- // find the target ip
- if (inet_aton(server.c_str(),&sock_addr.sin_addr)==0)
- {
- struct hostent *server_hent;
- server_hent=gethostbyname(server.c_str());
- if (server_hent == NULL)
- throw t2n_connect_error(string("can't find server ")+server);
+ sock = socket(PF_UNIX, SOCK_STREAM, 0);
+ if (!sock)
+ throw t2n_connect_error(string("socket() error: ")+strerror(errno));
- memcpy(&sock_addr.sin_addr,server_hent->h_addr_list[0],sizeof(sock_addr.sin_addr));
+ try
+ {
+ connect_with_timeout((struct sockaddr *) &unix_addr, sizeof(unix_addr));
+ }
+ catch (t2n_connect_error &e)
+ {
+ // recurse if retries left
+ if (max_retries > 0)
+ {
+ LOGSTREAM(debug,"retrying connect after connect error");
+ unix_connect(max_retries-1);
}
+ else
+ throw t2n_connect_error("no more retries left after connect error");
+ }
+}
+
+/// execute a connect on a prepared socket (tcp or unix) respecting timeouts
+void socket_client_connection::connect_with_timeout(struct sockaddr *sock_addr,unsigned int sockaddr_size)
+{
+ set_socket_options(sock);
+
+ /* non-blocking mode */
+ int flflags;
+ flflags=fcntl(sock,F_GETFL,0);
+ if (flflags < 0)
+ EXCEPTIONSTREAM(error,t2n_communication_error,"fcntl error on socket: " << strerror(errno));
+
+ flflags &= (O_NONBLOCK ^ 0xFFFF);
+ if (fcntl(sock,F_SETFL,flflags) < 0)
+ EXCEPTIONSTREAM(error,t2n_communication_error,"fcntl error on socket: " << strerror(errno));
+
+
+ LOGSTREAM(debug,"connect_with_timeout()");
+ int ret=::connect(sock,sock_addr, sockaddr_size);
+
+ if (ret < 0)
+ {
+ if (errno==EINPROGRESS)
+ {
+ LOGSTREAM(debug,"connect_with_timeout(): EINPROGRESS");
+
+ /* set timeout */
+ struct timeval tval;
+ struct timeval *timeout_ptr;
- sock = socket(PF_INET, SOCK_STREAM, 0);
- if (!sock)
- throw t2n_connect_error(string("socket() error: ")+strerror(errno));
+ if (connect_timeout_usec == -1)
+ timeout_ptr = NULL;
+ else
+ {
+ timeout_ptr = &tval;
- if (::connect(sock,(struct sockaddr *) &sock_addr, sizeof(sock_addr)))
+ // convert timeout from long long usec to int sec + int usec
+ tval.tv_sec = connect_timeout_usec / 1000000;
+ tval.tv_usec = connect_timeout_usec % 1000000;
+ }
+
+ fd_set connect_socket_set;
+ FD_ZERO(&connect_socket_set);
+ FD_SET(sock,&connect_socket_set);
+
+ int ret;
+ while ((ret=select(FD_SETSIZE, NULL, &connect_socket_set, NULL, timeout_ptr)) &&
+ ret < 0 && errno==EINTR);
+
+ if (ret < 0)
+ throw t2n_connect_error(string("connect() error (select): ")+strerror(errno));
+
+ socklen_t sopt=sizeof(int);
+ int valopt;
+ ret=getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)(&valopt), &sopt);
+ if (ret < 0 || valopt)
+ throw t2n_connect_error(string("connect() error (getsockopt): ")+strerror(errno));
+ }
+ else
throw t2n_connect_error(string("connect() error: ")+strerror(errno));
}
- else
- throw t2n_connect_error(string("invalid connection type"));
-
- set_socket_options(sock);
- do_callbacks(new_connection);
+ LOGSTREAM(debug,"connect_with_timeout(): success");
}
void socket_client_connection::close()
}
}
+/** @brief try to reconnect the current connection with the same connection credentials (host and port or path)
+
+ @note will throw an exeption if reconnecting not possible
+*/
+void socket_client_connection::reconnect()
+{
+ LOGSTREAM(debug,"reconnect()");
+
+ // close the current connection if still open
+ close();
+
+ socket_type_value type=get_type();
+
+ if (type == tcp_s)
+ tcp_connect(max_retries);
+ else if (type == unix_s)
+ unix_connect(max_retries);
+
+ // connection is open now, otherwise an execption would have been thrown
+ reopen();
+
+ LOGSTREAM(debug,"reconnect() done, client_connection::is_closed() now " << client_connection::is_closed());
+}
+
}
git://developer.intra2net.com / libt2n / blobdiff