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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "fetcher_manager.h"
#include <debug.h>
#include <threading/rwlock.h>
#include <utils/linked_list.h>
typedef struct private_fetcher_manager_t private_fetcher_manager_t;
/**
* private data of fetcher_manager
*/
struct private_fetcher_manager_t {
/**
* public functions
*/
fetcher_manager_t public;
/**
* list of registered fetchers, as entry_t
*/
linked_list_t *fetchers;
/**
* read write lock to list
*/
rwlock_t *lock;
};
typedef struct {
/** assocaited fetcher construction function */
fetcher_constructor_t create;
/** URL this fetcher support */
char *url;
} entry_t;
/**
* destroy an entry_t
*/
static void entry_destroy(entry_t *entry)
{
free(entry->url);
free(entry);
}
/**
* Implementation of fetcher_manager_t.fetch.
*/
static status_t fetch(private_fetcher_manager_t *this,
char *url, chunk_t *response, ...)
{
enumerator_t *enumerator;
status_t status = NOT_SUPPORTED;
entry_t *entry;
bool capable = FALSE;
this->lock->read_lock(this->lock);
enumerator = this->fetchers->create_enumerator(this->fetchers);
while (enumerator->enumerate(enumerator, &entry))
{
fetcher_option_t opt;
fetcher_t *fetcher;
bool good = TRUE;
va_list args;
/* check URL support of fetcher */
if (strncasecmp(entry->url, url, strlen(entry->url)))
{
continue;
}
/* create fetcher instance and set options */
fetcher = entry->create();
if (!fetcher)
{
continue;
}
va_start(args, response);
while (good)
{
opt = va_arg(args, fetcher_option_t);
switch (opt)
{
case FETCH_REQUEST_DATA:
good = fetcher->set_option(fetcher, opt, va_arg(args, chunk_t));
continue;
case FETCH_REQUEST_TYPE:
case FETCH_REQUEST_HEADER:
good = fetcher->set_option(fetcher, opt, va_arg(args, char*));
continue;
case FETCH_HTTP_VERSION_1_0:
good = fetcher->set_option(fetcher, opt);
continue;
case FETCH_TIMEOUT:
good = fetcher->set_option(fetcher, opt, va_arg(args, u_int));
continue;
case FETCH_END:
break;;
}
break;
}
va_end(args);
if (!good)
{ /* fetcher does not support supplied options, try another */
fetcher->destroy(fetcher);
continue;
}
status = fetcher->fetch(fetcher, url, response);
fetcher->destroy(fetcher);
/* try another fetcher only if this one does not support that URL */
if (status == NOT_SUPPORTED)
{
continue;
}
capable = TRUE;
break;
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
if (!capable)
{
DBG1(DBG_LIB, "unable to fetch from %s, no capable fetcher found", url);
}
return status;
}
/**
* Implementation of fetcher_manager_t.add_fetcher.
*/
static void add_fetcher(private_fetcher_manager_t *this,
fetcher_constructor_t create, char *url)
{
entry_t *entry = malloc_thing(entry_t);
entry->url = strdup(url);
entry->create = create;
this->lock->write_lock(this->lock);
this->fetchers->insert_last(this->fetchers, entry);
this->lock->unlock(this->lock);
}
/**
* Implementation of fetcher_manager_t.remove_fetcher.
*/
static void remove_fetcher(private_fetcher_manager_t *this,
fetcher_constructor_t create)
{
enumerator_t *enumerator;
entry_t *entry;
this->lock->write_lock(this->lock);
enumerator = this->fetchers->create_enumerator(this->fetchers);
while (enumerator->enumerate(enumerator, &entry))
{
if (entry->create == create)
{
this->fetchers->remove_at(this->fetchers, enumerator);
entry_destroy(entry);
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
}
/**
* Implementation of fetcher_manager_t.destroy
*/
static void destroy(private_fetcher_manager_t *this)
{
this->fetchers->destroy_function(this->fetchers, (void*)entry_destroy);
this->lock->destroy(this->lock);
free(this);
}
/*
* see header file
*/
fetcher_manager_t *fetcher_manager_create()
{
private_fetcher_manager_t *this = malloc_thing(private_fetcher_manager_t);
this->public.fetch = (status_t(*)(fetcher_manager_t*, char *url, chunk_t *response, ...))fetch;
this->public.add_fetcher = (void(*)(fetcher_manager_t*, fetcher_constructor_t,char*))add_fetcher;
this->public.remove_fetcher = (void(*)(fetcher_manager_t*, fetcher_constructor_t))remove_fetcher;
this->public.destroy = (void(*)(fetcher_manager_t*))destroy;
this->fetchers = linked_list_create();
this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
return &this->public;
}
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