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/*
IMMS: Intelligent Multimedia Management System
Copyright (C) 2001-2009 Michael Grigoriev
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __GIOSOCKET_H
#define __GIOSOCKET_H
#include <glib.h>
#include <string>
#include <list>
#include <iostream>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <string.h>
#include "immsconf.h"
using std::string;
class LineProcessor
{
public:
virtual void process_line(const string &line) = 0;
virtual ~LineProcessor() {}
};
class GIOSocket : public LineProcessor
{
public:
GIOSocket() : con(0), read_tag(0), write_tag(0), outp(0) {}
virtual ~GIOSocket() { close(); }
bool isok() { return con; }
void init(int fd)
{
fcntl(fd, F_SETFD, O_NONBLOCK);
con = g_io_channel_unix_new(fd);
read_tag = g_io_add_watch(con,
(GIOCondition)(G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP),
_read_event, this);
}
void write(const string &line)
{
if (outbuf.empty())
write_tag = g_io_add_watch(con, G_IO_OUT, _write_event, this);
outbuf.push_back(line);
}
void close()
{
if (con)
{
g_io_channel_close(con);
g_io_channel_unref(con);
}
if (write_tag)
g_source_remove(write_tag);
if (read_tag)
g_source_remove(read_tag);
write_tag = read_tag = 0;
inbuf = "";
outbuf.clear();
outp = 0;
con = 0;
}
virtual void connection_lost() = 0;
static gboolean _read_event(GIOChannel *source,
GIOCondition condition, gpointer data)
{
GIOSocket *s = (GIOSocket*)data;
return s->read_event(condition);
}
static gboolean _write_event(GIOChannel *source,
GIOCondition condition, gpointer data)
{
GIOSocket *s = (GIOSocket*)data;
return s->write_event(condition);
}
bool write_event(GIOCondition condition)
{
if (!con)
return false;
assert(condition & G_IO_OUT);
if (!outp && !outbuf.empty())
outp = outbuf.front().c_str();
if (!outp)
return (write_tag = 0);
unsigned len = strlen(outp);
gsize n = 0;
GIOError e = g_io_channel_write(con, (char*)outp, len, &n);
if (e == G_IO_ERROR_NONE)
{
if (n == len)
{
outbuf.pop_front();
outp = 0;
return outbuf.empty() ? (write_tag = 0) : 1;
}
outp += n;
}
return true;
}
bool read_event(GIOCondition condition)
{
if (!con)
return false;
if (condition & G_IO_HUP)
{
close();
connection_lost();
#ifdef DEBUG
std::cerr << "Connection terminated." << std::endl;
#endif
return false;
}
if (condition & G_IO_IN)
{
gsize n = 0;
GIOError e = g_io_channel_read(con, buf, sizeof(buf) - 1, &n);
if (e == G_IO_ERROR_NONE)
{
buf[n] = '\0';
char *lineend, *cur = buf;
while ((lineend = strchr(cur, '\n')))
{
*lineend = '\0';
inbuf += cur;
cur = lineend + 1;
process_line(inbuf);
inbuf = "";
}
inbuf += cur;
}
}
return true;
}
private:
char buf[128];
GIOChannel *con;
int read_tag, write_tag;
string inbuf;
const char *outp;
std::list<string> outbuf;
};
#endif
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