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friendica/include/dba.php

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<?php
require_once("dbm.php");
require_once('include/datetime.php');
/**
* @class MySQL database class
*
* For debugging, insert 'dbg(1);' anywhere in the program flow.
* dbg(0); will turn it off. Logging is performed at LOGGER_DATA level.
* When logging, all binary info is converted to text and html entities are escaped so that
* the debugging stream is safe to view within both terminals and web pages.
*
* This class is for the low level database stuff that does driver specific things.
*/
class dba {
private $debug = 0;
private $db;
private $result;
private $driver;
public $connected = false;
public $error = false;
private $_server_info = '';
private static $dbo;
function __construct($server, $user, $pass, $db, $install = false) {
$a = get_app();
$stamp1 = microtime(true);
$server = trim($server);
$user = trim($user);
$pass = trim($pass);
$db = trim($db);
if (!(strlen($server) && strlen($user))) {
$this->connected = false;
$this->db = null;
return;
}
if ($install) {
if (strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
if (! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) {
$this->error = sprintf(t('Cannot locate DNS info for database server \'%s\''), $server);
$this->connected = false;
$this->db = null;
return;
}
}
}
if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
$this->driver = 'pdo';
$connect = "mysql:host=".$server.";dbname=".$db;
if (isset($a->config["system"]["db_charset"])) {
$connect .= ";charset=".$a->config["system"]["db_charset"];
}
$this->db = @new PDO($connect, $user, $pass);
if (!$this->db->errorCode()) {
$this->connected = true;
}
} elseif (class_exists('mysqli')) {
$this->driver = 'mysqli';
$this->db = @new mysqli($server,$user,$pass,$db);
if (!mysqli_connect_errno()) {
$this->connected = true;
if (isset($a->config["system"]["db_charset"])) {
$this->db->set_charset($a->config["system"]["db_charset"]);
}
}
} elseif (function_exists('mysql_connect')) {
$this->driver = 'mysql';
$this->db = mysql_connect($server,$user,$pass);
if ($this->db && mysql_select_db($db,$this->db)) {
$this->connected = true;
if (isset($a->config["system"]["db_charset"])) {
mysql_set_charset($a->config["system"]["db_charset"], $this->db);
}
}
} else {
// No suitable SQL driver was found.
if (!$install) {
system_unavailable();
}
}
if (!$this->connected) {
$this->db = null;
if (!$install) {
system_unavailable();
}
}
$a->save_timestamp($stamp1, "network");
self::$dbo = $this;
}
/**
* @brief Returns the MySQL server version string
*
* This function discriminate between the deprecated mysql API and the current
* object-oriented mysqli API. Example of returned string: 5.5.46-0+deb8u1
*
* @return string
*/
public function server_info() {
if ($this->_server_info == '') {
switch ($this->driver) {
case 'pdo':
$this->_server_info = $this->db->getAttribute(PDO::ATTR_SERVER_VERSION);
break;
case 'mysqli':
$this->_server_info = $this->db->server_info;
break;
case 'mysql':
$this->_server_info = mysql_get_server_info($this->db);
break;
}
}
return $this->_server_info;
}
/**
* @brief Returns the selected database name
*
* @return string
*/
public function database_name() {
$r = $this->q("SELECT DATABASE() AS `db`");
return $r[0]['db'];
}
/**
* @brief Analyze a database query and log this if some conditions are met.
*
* @param string $query The database query that will be analyzed
*/
public function log_index($query) {
$a = get_app();
if ($a->config["system"]["db_log_index"] == "") {
return;
}
// Don't explain an explain statement
if (strtolower(substr($query, 0, 7)) == "explain") {
return;
}
// Only do the explain on "select", "update" and "delete"
if (!in_array(strtolower(substr($query, 0, 6)), array("select", "update", "delete"))) {
return;
}
$r = $this->q("EXPLAIN ".$query);
if (!dbm::is_result($r)) {
return;
}
$watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
$blacklist = explode(',', $a->config["system"]["db_log_index_blacklist"]);
foreach ($r AS $row) {
if ((intval($a->config["system"]["db_loglimit_index"]) > 0)) {
$log = (in_array($row['key'], $watchlist) AND
($row['rows'] >= intval($a->config["system"]["db_loglimit_index"])));
} else {
$log = false;
}
if ((intval($a->config["system"]["db_loglimit_index_high"]) > 0) AND ($row['rows'] >= intval($a->config["system"]["db_loglimit_index_high"]))) {
$log = true;
}
if (in_array($row['key'], $blacklist) OR ($row['key'] == "")) {
$log = false;
}
if ($log) {
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
$row['key']."\t".$row['rows']."\t".$row['Extra']."\t".
basename($backtrace[1]["file"])."\t".
$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
substr($query, 0, 2000)."\n", FILE_APPEND);
}
}
}
public function q($sql, $onlyquery = false) {
$a = get_app();
if (!$this->db || !$this->connected) {
return false;
}
$this->error = '';
$connstr = ($this->connected() ? "Connected" : "Disonnected");
$stamp1 = microtime(true);
$orig_sql = $sql;
if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
$sql = "/*".$a->callstack()." */ ".$sql;
}
$columns = 0;
switch ($this->driver) {
case 'pdo':
$result = @$this->db->query($sql);
// Is used to separate between queries that returning data - or not
if (!is_bool($result)) {
$columns = $result->columnCount();
}
break;
case 'mysqli':
$result = @$this->db->query($sql);
break;
case 'mysql':
$result = @mysql_query($sql,$this->db);
break;
}
$stamp2 = microtime(true);
$duration = (float)($stamp2 - $stamp1);
$a->save_timestamp($stamp1, "database");
if (strtolower(substr($orig_sql, 0, 6)) != "select") {
$a->save_timestamp($stamp1, "database_write");
}
if (x($a->config,'system') && x($a->config['system'],'db_log')) {
if (($duration > $a->config["system"]["db_loglimit"])) {
$duration = round($duration, 3);
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
basename($backtrace[1]["file"])."\t".
$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
substr($sql, 0, 2000)."\n", FILE_APPEND);
}
}
switch ($this->driver) {
case 'pdo':
$errorInfo = $this->db->errorInfo();
if ($errorInfo) {
$this->error = $errorInfo[2];
$this->errorno = $errorInfo[1];
}
break;
case 'mysqli':
if ($this->db->errno) {
$this->error = $this->db->error;
$this->errorno = $this->db->errno;
}
break;
case 'mysql':
if (mysql_errno($this->db)) {
$this->error = mysql_error($this->db);
$this->errorno = mysql_errno($this->db);
}
break;
}
if (strlen($this->error)) {
logger('DB Error ('.$connstr.') '.$this->errorno.': '.$this->error);
}
if ($this->debug) {
$mesg = '';
if ($result === false) {
$mesg = 'false';
} elseif ($result === true) {
$mesg = 'true';
} else {
switch ($this->driver) {
case 'pdo':
$mesg = $result->rowCount().' results'.EOL;
break;
case 'mysqli':
$mesg = $result->num_rows.' results'.EOL;
break;
case 'mysql':
$mesg = mysql_num_rows($result).' results'.EOL;
break;
}
}
$str = 'SQL = ' . printable($sql) . EOL . 'SQL returned ' . $mesg
. (($this->error) ? ' error: ' . $this->error : '')
. EOL;
logger('dba: ' . $str );
}
/**
* If dbfail.out exists, we will write any failed calls directly to it,
* regardless of any logging that may or may nor be in effect.
* These usually indicate SQL syntax errors that need to be resolved.
*/
if ($result === false) {
logger('dba: ' . printable($sql) . ' returned false.' . "\n" . $this->error);
if (file_exists('dbfail.out')) {
file_put_contents('dbfail.out', datetime_convert() . "\n" . printable($sql) . ' returned false' . "\n" . $this->error . "\n", FILE_APPEND);
}
}
if (is_bool($result)) {
return $result;
}
if ($onlyquery) {
$this->result = $result;
return true;
}
$r = array();
switch ($this->driver) {
case 'pdo':
while ($x = $result->fetch(PDO::FETCH_ASSOC)) {
$r[] = $x;
}
$result->closeCursor();
break;
case 'mysqli':
while ($x = $result->fetch_array(MYSQLI_ASSOC)) {
$r[] = $x;
}
$result->free_result();
break;
case 'mysql':
while ($x = mysql_fetch_array($result, MYSQL_ASSOC)) {
$r[] = $x;
}
mysql_free_result($result);
break;
}
// PDO doesn't return "true" on successful operations - like mysqli does
// Emulate this behaviour by checking if the query returned data and had columns
// This should be reliable enough
if (($this->driver == 'pdo') AND (count($r) == 0) AND ($columns == 0)) {
return true;
}
//$a->save_timestamp($stamp1, "database");
if ($this->debug) {
logger('dba: ' . printable(print_r($r, true)));
}
return($r);
}
public function dbg($dbg) {
$this->debug = $dbg;
}
public function escape($str) {
if ($this->db && $this->connected) {
switch ($this->driver) {
case 'pdo':
return substr(@$this->db->quote($str, PDO::PARAM_STR), 1, -1);
case 'mysqli':
return @$this->db->real_escape_string($str);
case 'mysql':
return @mysql_real_escape_string($str,$this->db);
}
}
}
function connected() {
switch ($this->driver) {
case 'pdo':
// Not sure if this really is working like expected
$connected = ($this->db->getAttribute(PDO::ATTR_CONNECTION_STATUS) != "");
break;
case 'mysqli':
$connected = $this->db->ping();
break;
case 'mysql':
$connected = mysql_ping($this->db);
break;
}
return $connected;
}
function insert_id() {
switch ($this->driver) {
case 'pdo':
$id = $this->db->lastInsertId();
break;
case 'mysqli':
$id = $this->db->insert_id;
break;
case 'mysql':
$id = mysql_insert_id($this->db);
break;
}
return $id;
}
function __destruct() {
if ($this->db) {
switch ($this->driver) {
case 'pdo':
$this->db = null;
break;
case 'mysqli':
$this->db->close();
break;
case 'mysql':
mysql_close($this->db);
break;
}
}
}
/**
* @brief Replaces ANY_VALUE() function by MIN() function,
* if the database server does not support ANY_VALUE().
*
* Considerations for Standard SQL, or MySQL with ONLY_FULL_GROUP_BY (default since 5.7.5).
* ANY_VALUE() is available from MySQL 5.7.5 https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
* A standard fall-back is to use MIN().
*
* @param string $sql An SQL string without the values
* @return string The input SQL string modified if necessary.
*/
public function any_value_fallback($sql) {
$server_info = $this->server_info();
if (version_compare($server_info, '5.7.5', '<') ||
(stripos($server_info, 'MariaDB') !== false)) {
$sql = str_ireplace('ANY_VALUE(', 'MIN(', $sql);
}
return $sql;
}
/**
* @brief Replaces the ? placeholders with the parameters in the $args array
*
* @param string $sql SQL query
* @param array $args The parameters that are to replace the ? placeholders
* @return string The replaced SQL query
*/
static private function replace_parameters($sql, $args) {
$offset = 0;
foreach ($args AS $param => $value) {
if (is_int($args[$param]) OR is_float($args[$param])) {
$replace = intval($args[$param]);
} else {
$replace = "'".dbesc($args[$param])."'";
}
$pos = strpos($sql, '?', $offset);
if ($pos !== false) {
$sql = substr_replace($sql, $replace, $pos, 1);
}
$offset = $pos + strlen($replace);
}
return $sql;
}
/**
* @brief Executes a prepared statement that returns data
* @usage Example: $r = p("SELECT * FROM `item` WHERE `guid` = ?", $guid);
* @param string $sql SQL statement
* @return object statement object
*/
static public function p($sql) {
$a = get_app();
$stamp1 = microtime(true);
$args = func_get_args();
unset($args[0]);
if (!self::$dbo OR !self::$dbo->connected) {
return false;
}
$sql = self::$dbo->any_value_fallback($sql);
if (x($a->config,'system') && x($a->config['system'], 'db_callstack')) {
$sql = "/*".$a->callstack()." */ ".$sql;
}
self::$dbo->error = '';
self::$dbo->errorno = 0;
switch (self::$dbo->driver) {
case 'pdo':
if (!$stmt = self::$dbo->db->prepare($sql)) {
$errorInfo = self::$dbo->db->errorInfo();
self::$dbo->error = $errorInfo[2];
self::$dbo->errorno = $errorInfo[1];
$retval = false;
break;
}
foreach ($args AS $param => $value) {
$stmt->bindParam($param, $args[$param]);
}
if (!$stmt->execute()) {
$errorInfo = self::$dbo->db->errorInfo();
self::$dbo->error = $errorInfo[2];
self::$dbo->errorno = $errorInfo[1];
$retval = false;
} else {
$retval = $stmt;
}
break;
case 'mysqli':
$stmt = self::$dbo->db->stmt_init();
if (!$stmt->prepare($sql)) {
self::$dbo->error = self::$dbo->db->error;
self::$dbo->errorno = self::$dbo->db->errno;
$retval = false;
break;
}
$params = '';
$values = array();
foreach ($args AS $param => $value) {
if (is_int($args[$param])) {
$params .= 'i';
} elseif (is_float($args[$param])) {
$params .= 'd';
} elseif (is_string($args[$param])) {
$params .= 's';
} else {
$params .= 'b';
}
$values[] = &$args[$param];
}
array_unshift($values, $params);
call_user_func_array(array($stmt, 'bind_param'), $values);
if (!$stmt->execute()) {
self::$dbo->error = self::$dbo->db->error;
self::$dbo->errorno = self::$dbo->db->errno;
$retval = false;
} else {
$stmt->store_result();
$retval = $stmt;
}
break;
case 'mysql':
// For the old "mysql" functions we cannot use prepared statements
$retval = mysql_query(self::replace_parameters($sql, $args), self::$dbo->db);
if (mysql_errno(self::$dbo->db)) {
self::$dbo->error = mysql_error(self::$dbo->db);
self::$dbo->errorno = mysql_errno(self::$dbo->db);
}
break;
}
if (self::$dbo->errorno != 0) {
logger('DB Error '.self::$dbo->errorno.': '.self::$dbo->error);
}
$a->save_timestamp($stamp1, 'database');
if (x($a->config,'system') && x($a->config['system'], 'db_log')) {
$stamp2 = microtime(true);
$duration = (float)($stamp2 - $stamp1);
if (($duration > $a->config["system"]["db_loglimit"])) {
$duration = round($duration, 3);
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
@file_put_contents($a->config["system"]["db_log"], datetime_convert()."\t".$duration."\t".
basename($backtrace[1]["file"])."\t".
$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
substr(self::replace_parameters($sql, $args), 0, 2000)."\n", FILE_APPEND);
}
}
return $retval;
}
/**
* @brief Executes a prepared statement like UPDATE or INSERT that doesn't return data
*
* @param string $sql SQL statement
* @return boolean Was the query successfull? False is returned only if an error occurred
*/
static public function e($sql) {
$a = get_app();
$stamp = microtime(true);
$args = func_get_args();
$stmt = call_user_func_array('self::p', $args);
if (is_bool($stmt)) {
$retval = $stmt;
} elseif (is_object($stmt)) {
$retval = true;
} else {
$retval = false;
}
self::close($stmt);
$a->save_timestamp($stamp, "database_write");
return $retval;
}
/**
* @brief Check if data exists
*
* @param string $sql SQL statement
* @return boolean Are there rows for that query?
*/
static public function exists($sql) {
$args = func_get_args();
$stmt = call_user_func_array('self::p', $args);
if (is_bool($stmt)) {
$retval = $stmt;
} else {
$retval = (self::num_rows($stmt) > 0);
}
self::close($stmt);
return $retval;
}
/**
* @brief Fetches the first row
*
* @param string $sql SQL statement
* @return array first row of query
*/
static public function fetch_first($sql) {
$args = func_get_args();
$stmt = call_user_func_array('self::p', $args);
if (is_bool($stmt)) {
$retval = $stmt;
} else {
$retval = self::fetch($stmt);
}
self::close($stmt);
return $retval;
}
/**
* @brief Returns the number of rows of a statement
*
* @param object Statement object
* @return int Number of rows
*/
static public function num_rows($stmt) {
switch (self::$dbo->driver) {
case 'pdo':
return $stmt->rowCount();
case 'mysqli':
return $stmt->num_rows;
case 'mysql':
return mysql_num_rows($stmt);
}
return 0;
}
/**
* @brief Fetch a single row
*
* @param object $stmt statement object
* @return array current row
*/
static public function fetch($stmt) {
if (!is_object($stmt)) {
return false;
}
switch (self::$dbo->driver) {
case 'pdo':
return $stmt->fetch(PDO::FETCH_ASSOC);
case 'mysqli':
// This code works, but is slow
// Bind the result to a result array
$cols = array();
$cols_num = array();
for ($x = 0; $x < $stmt->field_count; $x++) {
$cols[] = &$cols_num[$x];
}
call_user_func_array(array($stmt, 'bind_result'), $cols);
if (!$stmt->fetch()) {
return false;
}
// The slow part:
// We need to get the field names for the array keys
// It seems that there is no better way to do this.
$result = $stmt->result_metadata();
$fields = $result->fetch_fields();
$columns = array();
foreach ($cols_num AS $param => $col) {
$columns[$fields[$param]->name] = $col;
}
return $columns;
case 'mysql':
return mysql_fetch_array(self::$dbo->result, MYSQL_ASSOC);
}
}
/**
* @brief Insert a row into a table
*
* @param string $table Table name
* @param array $param parameter array
*
* @return boolean was the insert successfull?
*/
static public function insert($table, $param) {
$sql = "INSERT INTO `".$table."` (`".implode("`, `", array_keys($param))."`) VALUES (".
substr(str_repeat("?, ", count($param)), 0, -2).");";
$sql = self::replace_parameters($sql, $param);
return self::e($sql);
}
/**
* @brief Closes the current statement
*
* @param object $stmt statement object
* @return boolean was the close successfull?
*/
static public function close($stmt) {
if (!is_object($stmt)) {
return false;
}
switch (self::$dbo->driver) {
case 'pdo':
return $stmt->closeCursor();
case 'mysqli':
return $stmt->free_result();
return $stmt->close();
case 'mysql':
return mysql_free_result($stmt);
}
}
}
function printable($s) {
$s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
$s = str_replace("\x00",'.',$s);
if (x($_SERVER,'SERVER_NAME')) {
$s = escape_tags($s);
}
return $s;
}
// Procedural functions
function dbg($state) {
global $db;
if ($db) {
$db->dbg($state);
}
}
function dbesc($str) {
global $db;
if ($db && $db->connected) {
return($db->escape($str));
} else {
return(str_replace("'","\\'",$str));
}
}
// Function: q($sql,$args);
// Description: execute SQL query with printf style args.
// Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
// 'user', 1);
function q($sql) {
global $db;
$args = func_get_args();
unset($args[0]);
if ($db && $db->connected) {
$sql = $db->any_value_fallback($sql);
$stmt = @vsprintf($sql,$args); // Disabled warnings
//logger("dba: q: $stmt", LOGGER_ALL);
if ($stmt === false)
logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
$db->log_index($stmt);
return $db->q($stmt);
}
/**
*
* This will happen occasionally trying to store the
* session data after abnormal program termination
*
*/
logger('dba: no database: ' . print_r($args,true));
return false;
}
/**
* @brief Performs a query with "dirty reads"
*
* By doing dirty reads (reading uncommitted data) no locks are performed
* This function can be used to fetch data that doesn't need to be reliable.
*
* @param $args Query parameters (1 to N parameters of different types)
* @return array Query array
*/
function qu($sql) {
global $db;
$args = func_get_args();
unset($args[0]);
if ($db && $db->connected) {
$sql = $db->any_value_fallback($sql);
$stmt = @vsprintf($sql,$args); // Disabled warnings
if ($stmt === false)
logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
$db->log_index($stmt);
$db->q("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
$retval = $db->q($stmt);
$db->q("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
return $retval;
}
/**
*
* This will happen occasionally trying to store the
* session data after abnormal program termination
*
*/
logger('dba: no database: ' . print_r($args,true));
return false;
}
/**
*
* Raw db query, no arguments
*
*/
function dbq($sql) {
global $db;
if ($db && $db->connected) {
$ret = $db->q($sql);
} else {
$ret = false;
}
return $ret;
}
// Caller is responsible for ensuring that any integer arguments to
// dbesc_array are actually integers and not malformed strings containing
// SQL injection vectors. All integer array elements should be specifically
// cast to int to avoid trouble.
function dbesc_array_cb(&$item, $key) {
if (is_string($item))
$item = dbesc($item);
}
function dbesc_array(&$arr) {
if (is_array($arr) && count($arr)) {
array_walk($arr,'dbesc_array_cb');
}
}
function dba_timer() {
return microtime(true);
}
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