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怎么在PHP中使用redis限制搶購防止商品超發(fā)功能?相信很多沒有經(jīng)驗的人對此束手無策,為此本文總結(jié)了問題出現(xiàn)的原因和解決方法,通過這篇文章希望你能解決這個問題。
具體如下:
redis不僅僅是單純的緩存,它還有一些特殊的功能,在一些特殊場景上很好用。redis中key的原子自增incrby和判斷key不存在再寫入的setnx方法,可以有效的防止超發(fā)。
下面使用兩個不同的方式來說明利用redis做商品購買庫存數(shù)量限制。
業(yè)務(wù)場景很簡單,就是限制搶購5個商品,模擬并發(fā)請求搶購商品,每搶購一次對應(yīng)redis中的key值增加一次,通過判斷限購的數(shù)量來限制搶購,搶購成功寫入成功日志,失敗寫入失敗的信息記錄,通過記錄的數(shù)量來判斷是否超發(fā)。
文件index.php
<?php require_once './myRedis.php'; require_once './function.php'; class sendAward{ public $conf = []; const V1 = 'way1';//版本一 const V2 = 'way2';//版本二 const AMOUNTLIMIT = 5;//搶購數(shù)量限制 const INCRAMOUNT = 1;//redis遞增數(shù)量值 //初始化調(diào)用對應(yīng)方法執(zhí)行商品發(fā)放 public function __construct($conf,$type){ $this->conf = $conf; if(empty($type)) return ''; if($type==self::V1){ $this->way1(self::V1); }elseif($type==self::V2){ $this->way2(self::V2); }else{ return ''; } } //搶購商品方式一 protected function way1($v){ $redis = new myRedis($this->conf); $keyNmae = getKeyName($v); if(!$redis->exists($keyNmae)){ $redis->set($keyNmae,0); } $currAmount = $redis->get($keyNmae); if(($currAmount+self::INCRAMOUNT)>self::AMOUNTLIMIT){ writeLog("沒有搶到商品",$v); return; } $redis->incrby($keyNmae,self::INCRAMOUNT); writeLog("搶到商品",$v); } //搶購商品方式二 protected function way2($v){ $redis = new myRedis($this->conf); $keyNmae = getKeyName($v); if(!$redis->exists($keyNmae)){ $redis->setnx($keyNmae,0); } if($redis->incrby($keyNmae,self::INCRAMOUNT) > self::AMOUNTLIMIT){ writeLog("沒有搶到商品",$v); return; } writeLog("搶到商品",$v); } } //實例化調(diào)用對應(yīng)執(zhí)行方法 $type = isset($_GET['v'])?$_GET['v']:'way1'; $conf = [ 'host'=>'192.168.0.214','port'=>'6379', 'auth'=>'test','db'=>2, ]; new sendAward($conf,$type);
文件myRedis.php
<?php /** * @desc 自定義redis操作類 * **/ class myRedis{ public $handler = NULL; public function __construct($conf){ $this->handler = new Redis(); $this->handler->connect($conf['host'], $conf['port']); //連接Redis //設(shè)置密碼 if(isset($conf['auth'])){ $this->handler->auth($conf['auth']); //密碼驗證 } //選擇數(shù)據(jù)庫 if(isset($conf['db'])){ $this->handler->select($conf['db']);//選擇數(shù)據(jù)庫2 }else{ $this->handler->select(0);//默認(rèn)選擇0庫 } } //獲取key的值 public function get($name){ return $this->handler->get($name); } //設(shè)置key的值 public function set($name,$value){ return $this->handler->set($name,$value); } //判斷key是否存在 public function exists($key){ if($this->handler->exists($key)){ return true; } return false; } //當(dāng)key不存在的設(shè)置key的值,存在則不設(shè)置 public function setnx($key,$value){ return $this->handler->setnx($key,$value); } //將key的數(shù)值增加指定數(shù)值 public function incrby($key,$value){ return $this->handler->incrBy($key,$value); } }
文件function.php
<?php //獲取商品key名稱 function getKeyName($v) { return "send_goods_".$v; } //日志寫入方法 function writeLog($msg,$v) { $log = $msg.PHP_EOL; file_put_contents("log/$v.log",$log,FILE_APPEND); }
1.ab工具并發(fā)測試way1方法
[root@localhost oversend]# ab -c 100 -n 200 http://192.168.0.213:8083/index.php?v=way1 This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.0.213 (be patient) Completed 100 requests Completed 200 requests Finished 200 requests Server Software: nginx Server Hostname: 192.168.0.213 Server Port: 8083 Document Path: /index.php?v=way1 Document Length: 0 bytes Concurrency Level: 100 Time taken for tests: 0.089 seconds Complete requests: 200 Failed requests: 0 Write errors: 0 Total transferred: 30600 bytes HTML transferred: 0 bytes Requests per second: 2243.13 [#/sec] (mean) Time per request: 44.581 [ms] (mean) Time per request: 0.446 [ms] (mean, across all concurrent requests) Transfer rate: 335.16 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 6 2.2 5 17 Processing: 2 28 16.3 25 55 Waiting: 1 26 15.2 24 50 Total: 5 34 16.3 30 60 Percentage of the requests served within a certain time (ms) 50% 30 66% 35 75% 54 80% 56 90% 57 95% 60 98% 60 99% 60 100% 60 (longest request)
v1方法日志分析
[root@localhost log]# less -N way1.log 1 搶到商品 2 搶到商品 3 搶到商品 4 搶到商品 5 搶到商品 6 搶到商品 7 沒有搶到商品 8 沒有搶到商品 9 沒有搶到商品 10 沒有搶到商品 11 沒有搶到商品 12 沒有搶到商品
觀察日志發(fā)現(xiàn) 搶到商品的記錄有6條超過正常的5條,說明超發(fā)了
2.ab工具并發(fā)測試way2方法
[root@localhost oversend]# ab -c 100 -n 200 http://192.168.0.213:8083/index.php?v=way2 This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.0.213 (be patient) Completed 100 requests Completed 200 requests Finished 200 requests Server Software: nginx Server Hostname: 192.168.0.213 Server Port: 8083 Document Path: /index.php?v=way2 Document Length: 0 bytes Concurrency Level: 100 Time taken for tests: 0.087 seconds Complete requests: 200 Failed requests: 0 Write errors: 0 Total transferred: 31059 bytes HTML transferred: 0 bytes Requests per second: 2311.68 [#/sec] (mean) Time per request: 43.259 [ms] (mean) Time per request: 0.433 [ms] (mean, across all concurrent requests) Transfer rate: 350.58 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 6 5.4 5 13 Processing: 3 31 16.6 30 70 Waiting: 1 30 16.6 30 70 Total: 5 37 18.5 32 82 Percentage of the requests served within a certain time (ms) 50% 32 66% 41 75% 45 80% 50 90% 68 95% 80 98% 81 99% 82 100% 82 (longest request)
v2方法日志分析
[root@localhost log]# less -N v2.log [root@localhost log]# less -N way2.log 1 搶到商品 2 搶到商品 3 搶到商品 4 搶到商品 5 沒有搶到商品 6 搶到商品 7 沒有搶到商品 8 沒有搶到商品 9 沒有搶到商品 10 沒有搶到商品
看完上述內(nèi)容,你們掌握怎么在PHP中使用redis限制搶購防止商品超發(fā)功能的方法了嗎?如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容,歡迎關(guān)注億速云行業(yè)資訊頻道,感謝各位的閱讀!
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