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<?php
/**
* Redis connector using FFI and libhiredis
* PoC, only for documentation purpose
*
* Copyright (c) 2019 Remi Collet
* License: CC-BY-SA
* http://creativecommons.org/licenses/by-sa/4.0/
*/
namespace Remi;
class Redis {
// Singleton
static private $ffi = NULL;
// Redis connection: redisContext
private $conn = NULL;
// Log method calls
private $debug = false;
// From hiredis/read.h, REDIS_REPLY_* macros
const REDIS_REPLY_STRING = 1;
const REDIS_REPLY_ARRAY = 2;
const REDIS_REPLY_INTEGER = 3;
const REDIS_REPLY_NIL = 4;
const REDIS_REPLY_STATUS = 5;
const REDIS_REPLY_ERROR = 6;
/**
* Display debug information
*/
private function log($f, ...$a) {
if ($this->debug) {
vprintf($f, $a);
}
}
/**
* Parser the header and and init the FFI Singleton
*/
private function initFFI() {
if (self::$ffi) {
return;
}
$this->log("+ %s()\n", __METHOD__);
// Try if preloaded
try {
self::$ffi = \FFI::scope("_REMI_REDIS_");
} catch (\FFI\Exception $e) {
// Try direct load
self::$ffi = \FFI::load(__DIR__ . '/preload-redis.h');
}
if (!self::$ffi) {
throw new \RuntimeException("FFI parse fails");
}
}
/**
* Free redisContext memory
*/
public function cleanup() {
if (!is_null($this->conn)) {
self::$ffi->redisFree($this->conn);
$this->conn = NULL;
}
}
/**
* Constructor + connection
*/
public function __construct($path, $port=6379, $debug=false) {
$this->debug = $debug;
$this->log("+ %s(%s, %d)\n", __METHOD__, $path, $port);
$this->initFFI();
if ($path[0] === '/') {
$this->conn = self::$ffi->redisConnectUnix($path);
} else {
$this->conn = self::$ffi->redisConnect($path, $port);
}
if ($this->conn->err) {
$msg = '';
for($i=0 ; $i<128 && $this->conn->errstr[$i] ; $i++) {
$msg .= $this->conn->errstr[$i];
}
$this->cleanup();
throw new \RuntimeException($msg);
}
}
/**
* Destructor
*/
public function __destruct() {
$this->log("+ %s\n\n", __METHOD__);
$this->cleanup();
}
/**
* Parse the redisReply
*/
private function resp($rep, $free=true) {
if (is_null($rep)) {
throw new \RuntimeException('Command fails');
}
switch ($rep->type) {
case self::REDIS_REPLY_STATUS:
case self::REDIS_REPLY_STRING:
case self::REDIS_REPLY_ERROR:
$msg = '';
for($i=0 ; $i<$rep->len ; $i++) {
$msg .= $rep->str[$i];
}
if ($rep->type == self::REDIS_REPLY_ERROR) {
if ($free) self::$ffi->freeReplyObject($rep);
throw new \RuntimeException($msg);
}
$ret = $msg;
break;
case self::REDIS_REPLY_ARRAY:
$ret = [];
for ($i=0 ; $i<$rep->elements ; $i++) {
$ret[] = $this->resp($rep->element[$i], false);
}
break;
case self::REDIS_REPLY_INTEGER:
$ret = $rep->integer;
break;
case self::REDIS_REPLY_NIL:
$ret = NULL;
break;
default:
if ($free) self::$ffi->freeReplyObject($rep);
throw new \RuntimeException('Unkown response type');
}
if ($free) self::$ffi->freeReplyObject($rep);
return $ret;
}
/**
* Unkown command
*/
public function grrr() {
$this->log("+ %s()\n", __METHOD__);
return($this->resp(self::$ffi->redisCommand($this->conn, 'GRRR')));
}
/**
* DEL command
*/
public function del($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "DEL $name")));
}
/**
* SET command
*/
public function set($name, $value) {
$this->log("+ %s(%s, %s)\n", __METHOD__, $name, $value);
return($this->resp(self::$ffi->redisCommand($this->conn, "SET $name %s", (string)$value)));
}
/**
* GET command
*/
public function get($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "GET $name")));
}
/**
* INCR command
*/
public function incr($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "INCR $name")));
}
/**
* DECR command
*/
public function decr($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "DECR $name")));
}
/**
* LPUSH command
*/
public function lpush($name, $elt) {
$this->log("+ %s(%s, %s)\n", __METHOD__, $name, $elt);
return($this->resp(self::$ffi->redisCommand($this->conn, "LPUSH $name %s", (string)$elt)));
}
/**
* RPUSH command
*/
public function rpush($name, $elt) {
$this->log("+ %s(%s, %s)\n", __METHOD__, $name, $elt);
return($this->resp(self::$ffi->redisCommand($this->conn, "RPUSH $name %s", (string)$elt)));
}
/**
* LSET command
*/
public function lset($name, $ind, $elt) {
$this->log("+ %s(%s, %d, %s)\n", __METHOD__, $name, $ind, $elt);
return($this->resp(self::$ffi->redisCommand($this->conn, "LSET $name %d %s", (int)$ind, (string)$elt)));
}
/**
* LRANGE command
*/
public function lrange($name, $start, $end) {
$this->log("+ %s(%s, %d, %s)\n", __METHOD__, $name, $start, $end);
return($this->resp(self::$ffi->redisCommand($this->conn, "LRANGE $name %d %d", (int)$start, (int)$end)));
}
/**
* LPOP command
*/
public function lpop($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "LPOP $name")));
}
/**
* RPOP command
*/
public function rpop($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "RPOP $name")));
}
/**
* LLEN command
*/
public function llen($name) {
$this->log("+ %s(%s)\n", __METHOD__, $name);
return($this->resp(self::$ffi->redisCommand($this->conn, "LLEN $name")));
}
}
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