《PHP教程:PHP高級(jí)編程實(shí)例:編寫守護(hù)進(jìn)程》要點(diǎn):
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PHP應(yīng)用1.什么是守護(hù)過程
PHP應(yīng)用守護(hù)進(jìn)程是脫離于終端而且在后臺(tái)運(yùn)行的進(jìn)程.守護(hù)進(jìn)程脫離于終端是為了避免進(jìn)程在執(zhí)行過程中的信息在任何終端上顯示而且進(jìn)程也不會(huì)被任何終端所產(chǎn)生的終端信息所打斷.
PHP應(yīng)用例如 apache, nginx, mysql 都是守護(hù)過程
PHP應(yīng)用2.為什么開發(fā)守護(hù)過程
PHP應(yīng)用很多程序以服務(wù)形式存在,他沒有終端或UI交互,它可能采納其他方式與其他程序交互,如TCP/UDP Socket, UNIX Socket, fifo.程序一旦啟動(dòng)便進(jìn)入后臺(tái),直到滿足條件他便開始處理任務(wù).
PHP應(yīng)用3.何時(shí)采納守護(hù)進(jìn)程開發(fā)應(yīng)用程序
PHP應(yīng)用以我當(dāng)前的需求為例,我必要運(yùn)行一個(gè)程序,然后監(jiān)聽某端口,持續(xù)接受服務(wù)端發(fā)起的數(shù)據(jù),然后對(duì)數(shù)據(jù)分析處理,再將結(jié)果寫入到數(shù)據(jù)庫(kù)中; 我采用ZeroMQ實(shí)現(xiàn)數(shù)據(jù)收發(fā).
PHP應(yīng)用如果我不采納守護(hù)進(jìn)程方式開發(fā)該程序,程序一旦運(yùn)行就會(huì)占用當(dāng)前終端窗框,還有受到當(dāng)前終端鍵盤輸入影響,有可能程序誤退出.
PHP應(yīng)用4.守護(hù)進(jìn)程的平安問題
PHP應(yīng)用我們希望程序在非超等用戶運(yùn)行,這樣一旦由于程序出現(xiàn)漏洞被駭客控制,攻擊者只能繼承運(yùn)行權(quán)限,而無(wú)法獲得超等用戶權(quán)限.
PHP應(yīng)用我們希望程序只能運(yùn)行一個(gè)實(shí)例,不運(yùn)行同事開啟兩個(gè)以上的程序,因?yàn)闀?huì)呈現(xiàn)端口沖突等等問題.
PHP應(yīng)用5.怎樣開發(fā)守護(hù)過程
PHP應(yīng)用例 1. 守護(hù)過程例示
PHP應(yīng)用
<?php
class ExampleWorker extends Worker {
#public function __construct(Logging $logger) {
# $this->logger = $logger;
#}
#protected $logger;
protected static $dbh;
public function __construct() {
}
public function run(){
$dbhost = '192.168.2.1'; // 數(shù)據(jù)庫(kù)服務(wù)器
$dbport = 3306;
$dbuser = 'www'; // 數(shù)據(jù)庫(kù)用戶名
$dbpass = 'qwer123'; // 數(shù)據(jù)庫(kù)暗碼
$dbname = 'example'; // 數(shù)據(jù)庫(kù)名
self::$dbh = new PDO("mysql:host=$dbhost;port=$dbport;dbname=$dbname", $dbuser, $dbpass, array(
/* PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\'', */
PDO::MYSQL_ATTR_COMPRESS => true,
PDO::ATTR_PERSISTENT => true
)
);
}
protected function getInstance(){
return self::$dbh;
}
}
/* the collectable class implements machinery for Pool::collect */
class Fee extends Stackable {
public function __construct($msg) {
$trades = explode(",", $msg);
$this->data = $trades;
print_r($trades);
}
public function run() {
#$this->worker->logger->log("%s executing in Thread #%lu", __CLASS__, $this->worker->getThreadId() );
try {
$dbh = $this->worker->getInstance();
$insert = "INSERT INTO fee(ticket, login, volume, `status`) VALUES(:ticket, :login, :volume,'N')";
$sth = $dbh->prepare($insert);
$sth->bindValue(':ticket', $this->data[0]);
$sth->bindValue(':login', $this->data[1]);
$sth->bindValue(':volume', $this->data[2]);
$sth->execute();
$sth = null;
/* ...... */
$update = "UPDATE fee SET `status` = 'Y' WHERE ticket = :ticket and `status` = 'N'";
$sth = $dbh->prepare($update);
$sth->bindValue(':ticket', $this->data[0]);
$sth->execute();
//echo $sth->queryString;
//$dbh = null;
}
catch(PDOException $e) {
$error = sprintf("%s,%s\n", $mobile, $id );
file_put_contents("mobile_error.log", $error, FILE_APPEND);
}
}
}
class Example {
/* config */
const LISTEN = "tcp://192.168.2.15:5555";
const MAXCONN = 100;
const pidfile = __CLASS__;
const uid = 80;
const gid = 80;
protected $pool = NULL;
protected $zmq = NULL;
public function __construct() {
$this->pidfile = '/var/run/'.self::pidfile.'.pid';
}
private function daemon(){
if (file_exists($this->pidfile)) {
echo "The file $this->pidfile exists.\n";
exit();
}
$pid = pcntl_fork();
if ($pid == -1) {
die('could not fork');
} else if ($pid) {
// we are the parent
//pcntl_wait($status); //Protect against Zombie children
exit($pid);
} else {
// we are the child
file_put_contents($this->pidfile, getmypid());
posix_setuid(self::uid);
posix_setgid(self::gid);
return(getmypid());
}
}
private function start(){
$pid = $this->daemon();
$this->pool = new Pool(self::MAXCONN, \ExampleWorker::class, []);
$this->zmq = new ZMQSocket(new ZMQContext(), ZMQ::SOCKET_REP);
$this->zmq->bind(self::LISTEN);
/* Loop receiving and echoing back */
while ($message = $this->zmq->recv()) {
//print_r($message);
//if($trades){
$this->pool->submit(new Fee($message));
$this->zmq->send('TRUE');
//}else{
// $this->zmq->send('FALSE');
//}
}
$pool->shutdown();
}
private function stop(){
if (file_exists($this->pidfile)) {
$pid = file_get_contents($this->pidfile);
posix_kill($pid, 9);
unlink($this->pidfile);
}
}
private function help($proc){
printf("%s start | stop | help \n", $proc);
}
public function main($argv){
if(count($argv) < 2){
printf("please input help parameter\n");
exit();
}
if($argv[1] === 'stop'){
$this->stop();
}else if($argv[1] === 'start'){
$this->start();
}else{
$this->help($argv[0]);
}
}
}
$cgse = new Example();
$cgse->main($argv);
PHP應(yīng)用5.1. 程序啟動(dòng)
PHP應(yīng)用下面是法式啟動(dòng)后進(jìn)入后臺(tái)的代碼
PHP應(yīng)用通過進(jìn)程ID文件來(lái)判斷,當(dāng)前進(jìn)程狀態(tài),如果進(jìn)程ID文件存在表示程序在運(yùn)行中,通過代碼file_exists($this->pidfile)實(shí)現(xiàn),但而后進(jìn)程被kill必要手工刪除該文件才能運(yùn)行
PHP應(yīng)用
private function daemon(){
if (file_exists($this->pidfile)) {
echo "The file $this->pidfile exists.\n";
exit();
}
$pid = pcntl_fork();
if ($pid == -1) {
die('could not fork');
} else if ($pid) {
// we are the parent
//pcntl_wait($status); //Protect against Zombie children
exit($pid);
} else {
// we are the child
file_put_contents($this->pidfile, getmypid());
posix_setuid(self::uid);
posix_setgid(self::gid);
return(getmypid());
}
}
PHP應(yīng)用法式啟動(dòng)后,父進(jìn)程會(huì)推出,子進(jìn)程會(huì)在后臺(tái)運(yùn)行,子進(jìn)程權(quán)限從root切換到指定用戶,同時(shí)將pid寫入進(jìn)程ID文件.
PHP應(yīng)用5.2. 法式停止
PHP應(yīng)用法式停止,只需讀取pid文件,然后調(diào)用posix_kill($pid, 9); 最后將該文件刪除.
PHP利用
private function stop(){
if (file_exists($this->pidfile)) {
$pid = file_get_contents($this->pidfile);
posix_kill($pid, 9);
unlink($this->pidfile);
}
}
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