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/*
This file is part of GNUnet.
Copyright (C) 2008--2013 GNUnet e.V.
GNUnet 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 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
*/
/**
* @file testbed-logger/gnunet-service-testbed-logger.c
* @brief service for collecting messages and writing to a file
* @author Sree Harsha Totakura
*/
#include "platform.h"
#include "gnunet_util_lib.h"
/**
* Generic logging shorthand
*/
#define LOG(type, ...) \
GNUNET_log (type, __VA_ARGS__)
/**
* Debug logging shorthand
*/
#define LOG_DEBUG(...) \
LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
/**
* Handle for buffered writing.
*/
struct GNUNET_BIO_WriteHandle *bio;
/**
* The number of connections we have
*/
static unsigned int nconn;
/**
* Are we shutting down?
*/
static int in_shutdown;
/**
* Check #GNUNET_MESSAGE_TYPE_TESTBED_LOGGER_MSG messages
*
* @param cls client identification of the client
* @param msg the actual message
* @return #GNUNET_OK (they are all always OK)
*/
static int
check_log_msg (void *cls,
const struct GNUNET_MessageHeader *msg)
{
return GNUNET_OK;
}
/**
* Message handler for #GNUNET_MESSAGE_TYPE_TESTBED_LOGGER_MSG messages
*
* @param cls client identification of the client
* @param msg the actual message
*/
static void
handle_log_msg (void *cls,
const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_SERVICE_Client *client = cls;
uint16_t ms;
ms = ntohs (msg->size) - sizeof (struct GNUNET_MessageHeader);
GNUNET_BIO_write (bio,
&msg[1],
ms);
GNUNET_SERVICE_client_continue (client);
}
/**
* Task to clean up and shutdown nicely
*
* @param cls NULL
*/
static void
shutdown_task (void *cls)
{
in_shutdown = GNUNET_YES;
if (0 != nconn)
{
/* Delay shutdown if there are active connections */
GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
NULL);
return;
}
GNUNET_break (GNUNET_OK ==
GNUNET_BIO_write_close (bio));
}
/**
* Callback called when a client connects to the service.
*
* @param cls closure for the service
* @param c the new client that connected to the service
* @param mq the message queue used to send messages to the client
* @return @a c
*/
static void *
client_connect_cb (void *cls,
struct GNUNET_SERVICE_Client *c,
struct GNUNET_MQ_Handle *mq)
{
/* FIXME: is this really what we want here? */
GNUNET_SERVICE_client_persist (c);
nconn++;
return c;
}
/**
* Callback called when a client disconnected from the service
*
* @param cls closure for the service
* @param c the client that disconnected
* @param internal_cls should be equal to @a c
*/
static void
client_disconnect_cb (void *cls,
struct GNUNET_SERVICE_Client *c,
void *internal_cls)
{
nconn--;
if (GNUNET_YES == in_shutdown)
GNUNET_SCHEDULER_shutdown ();
GNUNET_assert (c == internal_cls);
}
/**
* Testbed setup
*
* @param cls closure
* @param cfg configuration to use
* @param service the initialized service
*/
static void
logger_run (void *cls,
const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_SERVICE_Handle *service)
{
char *dir;
char *fn;
char *hname;
size_t hname_len;
pid_t pid;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"TESTBED-LOGGER",
"DIR",
&dir))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"TESTBED-LOGGER",
"DIR");
GNUNET_SCHEDULER_shutdown ();
return;
}
pid = getpid ();
hname_len = GNUNET_OS_get_hostname_max_length ();
hname = GNUNET_malloc (hname_len);
if (0 != gethostname (hname,
hname_len))
{
LOG (GNUNET_ERROR_TYPE_ERROR,
"Cannot get hostname. Exiting\n");
GNUNET_free (hname);
GNUNET_free (dir);
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_asprintf (&fn,
"%s/%.*s_%jd.dat",
dir,
hname_len,
hname,
(intmax_t) pid);
GNUNET_free (hname);
GNUNET_free (dir);
if (NULL == (bio = GNUNET_BIO_write_open (fn)))
{
GNUNET_free (fn);
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_free (fn);
GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
NULL);
LOG_DEBUG ("TESTBED-LOGGER startup complete\n");
}
/**
* Define "main" method using service macro.
*/
GNUNET_SERVICE_MAIN
("testbed-logger",
GNUNET_SERVICE_OPTION_NONE,
&logger_run,
&client_connect_cb,
&client_disconnect_cb,
NULL,
GNUNET_MQ_hd_var_size (log_msg,
GNUNET_MESSAGE_TYPE_TESTBED_LOGGER_MSG,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_handler_end ());
/* end of gnunet-service-testbed-logger.c */
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