Swoole 4.4：支持 CURL 协程化

桶哥

发布于 2019-07-10 18:05:15

1.2K0

发布于 2019-07-10 18:05:15

在4.4之前的版本中，Swoole一直不支持CURL协程化，在代码中无法使用curl。由于curl使用了libcurl库实现，无法直接hook它的socket，4.4版本使用Swoole\Coroutine\Http\Client模拟实现了curl的API，并在底层替换了curl_init等函数的C Handler。

提示

CURL Hook的特性尚处于试验阶段，请勿在生产环境中直接使用
暂不支持文件上传、CURL Multi
仍然需要依赖curl，请务必安装curl扩展

支持的特性列表

GET/POST
Header
Cookie
Https

经过验证Guzzle CURL完全可以使用

开启

使用Runtime::enableCoroutine来开启CURL Hook。

默认不开启CURL Hook

Swoole\Runtime::enableCoroutine(SWOOLE_HOOK_ALL);
Swoole\Runtime::enableCoroutine(SWOOLE_HOOK_CURL);

使用

$n = 10;
while($n--) {
    go(function () {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "http://www.xinhuanet.com/");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        $output = curl_exec($ch);
        if ($output === FALSE) {
            echo "CURL Error:" . curl_error($ch);
        }
        curl_close($ch);
        echo strlen($output) . " bytes\n";
    });
}

要将上面两段代码合并到一个文件中执行

运行结果

htf@LAPTOP-0K15EFQI:~/swoole-src/examples$ time php curl.php
177173 bytes
177173 bytes
177173 bytes
177173 bytes
177173 bytes
177173 bytes
177173 bytes
177173 bytes
177173 bytes
177173 bytes

real    0m0.534s
user    0m0.031s
sys     0m0.297s

可以看到整个程序是并行的，进程没有任何阻塞。

strace 跟踪

使用strace跟踪发现，所有系统调用均变成epoll+socket的异步非阻塞调用了。

munmap(0x7fc021950000, 2101248)         = 0
epoll_ctl(3, EPOLL_CTL_DEL, 19, NULL)   = 0
recvfrom(19, "\3442@o\362\340\10\240#\337=J2=\274\337\201\307=3O\324\342\35s7\\\16\7^\"\23"..., 65536, 0, NULL, NULL) = 19559
close(19)                               = 0
write(1, "177115 bytes\n", 13)          = 13
munmap(0x7fc021110000, 2101248)         = 0
epoll_ctl(3, EPOLL_CTL_DEL, 18, NULL)   = 0
recvfrom(18, "\3442@o\362\340\10\240#\337=J2=\274\337\201\307=3O\324\342\35s7\\\16\7^\"\23"..., 65536, 0, NULL, NULL) = 19559
close(18)                               = 0
write(1, "177115 bytes\n", 13)          = 13
munmap(0x7fc021320000, 2101248)         = 0
clock_gettime(CLOCK_MONOTONIC, {tv_sec=238, tv_nsec=802835000}) = 0
time(NULL)                              = 1559698606 (2019-06-05T09:36:46+0800)
futex(0x7fffd9e01ce0, FUTEX_WAKE_PRIVATE, 2147483647) = 4
futex(0x7fffd9e01c90, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fc023ff09d0, FUTEX_WAIT, 56, NULL) = -1 EAGAIN (Resource temporarily unavailable)
epoll_ctl(3, EPOLL_CTL_DEL, 5, NULL)    = 0
close(5)                                = 0
close(6)                                = 0
close(2)                                = 0
close(1)                                = 0
close(0)                                = 0
munmap(0x7fc028fa0000, 2231560)         = 0
munmap(0x7fc028d1f000, 2624568)         = 0
close(3)                                =

划重点