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/*
+----------------------------------------------------------------------+
| Copyright (c) 2009-2010 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andrei Zmievski <andrei@php.net> |
+----------------------------------------------------------------------+
*/

#include <stdlib.h>
#include <string.h>
#include <php.h>
#include <php_main.h>

#ifdef ZTS
#include "TSRM.h"
#endif

#include <php_ini.h>
#include <SAPI.h>
#include <ext/standard/info.h>
#include <zend_extensions.h>
#include <zend_exceptions.h>
#include <ext/standard/php_smart_str.h>
#include <ext/standard/php_var.h>
#include <libmemcached/memcached.h>

#include "php_memcached.h"
#include "php_memcached_session.h"

extern ZEND_DECLARE_MODULE_GLOBALS(php_memcached)

#define MEMC_SESS_DEFAULT_LOCK_WAIT 150000
#define MEMC_SESS_LOCK_EXPIRATION 30

ps_module ps_mod_memcached = {
PS_MOD(memcached)
};

static int php_memc_sess_lock(memcached_st *memc, const char *key TSRMLS_DC)
{
char *lock_key = NULL;
int lock_key_len = 0;
unsigned long attempts;
long lock_maxwait;
long lock_wait = MEMC_G(sess_lock_wait);
time_t expiration;
memcached_return status;
/* set max timeout for session_start = max_execution_time. (c) Andrei Darashenka, Richter & Poweleit GmbH */

lock_maxwait = zend_ini_long(ZEND_STRS("max_execution_time"), 0);
if (lock_maxwait <= 0) {
lock_maxwait = MEMC_SESS_LOCK_EXPIRATION;
}
if (lock_wait == 0) {
lock_wait = MEMC_SESS_DEFAULT_LOCK_WAIT;
}
expiration = time(NULL) + lock_maxwait + 1;
attempts = (unsigned long)((1000000.0 / lock_wait) * lock_maxwait);

lock_key_len = spprintf(&lock_key, 0, "lock.%s", key);
do {
status = memcached_add(memc, lock_key, lock_key_len, "1", sizeof("1")-1, expiration, 0);
if (status == MEMCACHED_SUCCESS) {
MEMC_G(sess_locked) = 1;
MEMC_G(sess_lock_key) = lock_key;
MEMC_G(sess_lock_key_len) = lock_key_len;
return 0;
} else if (status != MEMCACHED_NOTSTORED && status != MEMCACHED_DATA_EXISTS) {
break;
}

if (lock_wait > 0) {
usleep(lock_wait);
}
} while(--attempts > 0);

efree(lock_key);
return -1;
}

static void php_memc_sess_unlock(memcached_st *memc TSRMLS_DC)
{
if (MEMC_G(sess_locked)) {
memcached_delete(memc, MEMC_G(sess_lock_key), MEMC_G(sess_lock_key_len), 0);
MEMC_G(sess_locked) = 0;
efree(MEMC_G(sess_lock_key));
MEMC_G(sess_lock_key_len) = 0;
}
}

PS_OPEN_FUNC(memcached)
{
memcached_sess *memc_sess = PS_GET_MOD_DATA();
memcached_return status;
char *p, *plist_key = NULL;
int plist_key_len;

if (!strncmp((char *)save_path, "PERSISTENT=", sizeof("PERSISTENT=") - 1)) {
zend_rsrc_list_entry *le = NULL;
char *e;

p = (char *)save_path + sizeof("PERSISTENT=") - 1;
if (!*p) {
error:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid persistent id for session storage");
return FAILURE;
}
if ((e = strchr(p, ' '))) {
plist_key_len = spprintf(&plist_key, 0, "memcached_sessions:id=%.*s", (int)(e - p), p);
} else {
goto error;
}
plist_key_len++;
if (zend_hash_find(&EG(persistent_list), plist_key, plist_key_len, (void *)&le) == SUCCESS) {
if (le->type == php_memc_sess_list_entry()) {
memc_sess = (memcached_sess *) le->ptr;
PS_SET_MOD_DATA(memc_sess);
return SUCCESS;
}
}
p = e + 1;
memc_sess = pecalloc(sizeof(*memc_sess), 1, 1);
memc_sess->is_persisent = 1;
} else {
p = (char *)save_path;
memc_sess = ecalloc(sizeof(*memc_sess), 1);
memc_sess->is_persisent = 0;
}

if (!strstr(p, "--SERVER")) {
memcached_server_st *servers = memcached_servers_parse(p);
if (servers) {
memc_sess->memc_sess = memcached_create(NULL);
if (memc_sess->memc_sess) {
status = memcached_server_push(memc_sess->memc_sess, servers);
memcached_server_list_free(servers);

if (memcached_callback_set(memc_sess->memc_sess, MEMCACHED_CALLBACK_PREFIX_KEY, MEMC_G(sess_prefix)) != MEMCACHED_SUCCESS) {
PS_SET_MOD_DATA(NULL);
if (plist_key) {
efree(plist_key);
}
memcached_free(memc_sess->memc_sess);
php_error_docref(NULL TSRMLS_CC, E_WARNING, "bad memcached key prefix in memcached.sess_prefix");
return FAILURE;
}

if (status == MEMCACHED_SUCCESS) {
goto success;
}
} else {
memcached_server_list_free(servers);
php_error_docref(NULL TSRMLS_CC, E_WARNING, "could not allocate libmemcached structure");
}
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed to parse session.save_path");
}
} else {
memc_sess->memc_sess = memcached(p, strlen(p));
if (!memc_sess->memc_sess) {
char error_buffer[1024];
if (libmemcached_check_configuration(p, strlen(p), error_buffer, sizeof(error_buffer)) != MEMCACHED_SUCCESS) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "session.save_path configuration error %s", error_buffer);
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed to initialize memcached session storage");
}
} else {
success:
PS_SET_MOD_DATA(memc_sess);

if (plist_key) {
zend_rsrc_list_entry le;

le.type = php_memc_sess_list_entry();
le.ptr = memc_sess;

if (zend_hash_update(&EG(persistent_list), (char *)plist_key, plist_key_len, (void *)&le, sizeof(le), NULL) == FAILURE) {
efree(plist_key);
php_error_docref(NULL TSRMLS_CC, E_ERROR, "could not register persistent entry");
}
efree(plist_key);
}

if (MEMC_G(sess_binary_enabled)) {
if (memcached_behavior_set(memc_sess->memc_sess, MEMCACHED_BEHAVIOR_BINARY_PROTOCOL, (uint64_t) 1) == MEMCACHED_FAILURE) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed to set memcached session binary protocol");
return FAILURE;
}
}

return SUCCESS;
}
}

if (plist_key) {
efree(plist_key);
}
PS_SET_MOD_DATA(NULL);
return FAILURE;
}

PS_CLOSE_FUNC(memcached)
{
memcached_sess *memc_sess = PS_GET_MOD_DATA();

if (MEMC_G(sess_locking_enabled)) {
php_memc_sess_unlock(memc_sess->memc_sess TSRMLS_CC);
}
if (memc_sess->memc_sess) {
if (!memc_sess->is_persisent) {
memcached_free(memc_sess->memc_sess);
efree(memc_sess);
}
PS_SET_MOD_DATA(NULL);
}

return SUCCESS;
}

PS_READ_FUNC(memcached)
{
char *payload = NULL;
size_t payload_len = 0;
int key_len = strlen(key);
uint32_t flags = 0;
memcached_return status;
memcached_sess *memc_sess = PS_GET_MOD_DATA();
size_t key_length;

key_length = strlen(MEMC_G(sess_prefix)) + key_len + 5; // prefix + "lock."
if (!key_length || key_length >= MEMCACHED_MAX_KEY) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "The session id is too long or contains illegal characters");
PS(invalid_session_id) = 1;
return FAILURE;
}

if (MEMC_G(sess_locking_enabled)) {
if (php_memc_sess_lock(memc_sess->memc_sess, key TSRMLS_CC) < 0) {
return FAILURE;
}
}

payload = memcached_get(memc_sess->memc_sess, key, key_len, &payload_len, &flags, &status);

if (status == MEMCACHED_SUCCESS) {
*val = estrndup(payload, payload_len);
*vallen = payload_len;
free(payload);
return SUCCESS;
} else {
return FAILURE;
}
}

PS_WRITE_FUNC(memcached)
{
int key_len = strlen(key);
time_t expiration = 0;
memcached_return status;
memcached_sess *memc_sess = PS_GET_MOD_DATA();
size_t key_length;

key_length = strlen(MEMC_G(sess_prefix)) + key_len + 5; // prefix + "lock."
if (!key_length || key_length >= MEMCACHED_MAX_KEY) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "The session id is too long or contains illegal characters");
PS(invalid_session_id) = 1;
return FAILURE;
}

if (PS(gc_maxlifetime) > 0) {
expiration = PS(gc_maxlifetime);
}
status = memcached_set(memc_sess->memc_sess, key, key_len, val, vallen, expiration, 0);

if (status == MEMCACHED_SUCCESS) {
return SUCCESS;
} else {
return FAILURE;
}
}

PS_DESTROY_FUNC(memcached)
{
memcached_sess *memc_sess = PS_GET_MOD_DATA();

memcached_delete(memc_sess->memc_sess, key, strlen(key), 0);
if (MEMC_G(sess_locking_enabled)) {
php_memc_sess_unlock(memc_sess->memc_sess TSRMLS_CC);
}

return SUCCESS;
}

PS_GC_FUNC(memcached)
{
return SUCCESS;
}
/* }}} */
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