Example #1 Simple HTTP client
<?php
// Read callback
function readcb($bev, $base) {
//$input = $bev->input; //$bev->getInput();
//$pos = $input->search("TTP");
$pos = $bev->input->search("TTP");
while (($n = $bev->input->remove($buf, 1024)) > 0) {
echo $buf;
}
}
// Event callback
function eventcb($bev, $events, $base) {
if ($events & EventBufferEvent::CONNECTED) {
echo "Connected.\n";
} elseif ($events & (EventBufferEvent::ERROR | EventBufferEvent::EOF)) {
if ($events & EventBufferEvent::ERROR) {
echo "DNS error: ", $bev->getDnsErrorString(), PHP_EOL;
}
echo "Closing\n";
$base->exit();
exit("Done\n");
}
}
if ($argc != 3) {
echo <<<EOS
Trivial HTTP 0.x client
Syntax: php {$argv[0]} [hostname] [resource]
Example: php {$argv[0]} www.google.com /
EOS;
exit();
}
$base = new EventBase();
$dns_base = new EventDnsBase($base, TRUE); // We'll use async DNS resolving
if (!$dns_base) {
exit("Failed to init DNS Base\n");
}
$bev = new EventBufferEvent($base, /* use internal socket */ NULL,
EventBufferEvent::OPT_CLOSE_ON_FREE | EventBufferEvent::OPT_DEFER_CALLBACKS,
"readcb", /* writecb */ NULL, "eventcb", $base
);
if (!$bev) {
exit("Failed creating bufferevent socket\n");
}
//$bev->setCallbacks("readcb", /* writecb */ NULL, "eventcb", $base);
$bev->enable(Event::READ | Event::WRITE);
$output = $bev->output; //$bev->getOutput();
if (!$output->add(
"GET {$argv[2]} HTTP/1.0\r\n".
"Host: {$argv[1]}\r\n".
"Connection: Close\r\n\r\n"
)) {
exit("Failed adding request to output buffer\n");
}
if (!$bev->connectHost($dns_base, $argv[1], 80, EventUtil::AF_UNSPEC)) {
exit("Can't connect to host {$argv[1]}\n");
}
$base->dispatch();
?>
以上例程的输出类似于：
Connected. HTTP/1.1 301 Moved Permanently Date: Fri, 01 Mar 2013 18:47:48 GMT Location: http://www.google.co.uk/ Content-Type: text/html; charset=UTF-8 Cache-Control: public, max-age=2592000 Server: gws Content-Length: 221 X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Age: 133438 Expires: Sat, 30 Mar 2013 05:39:28 GMT Connection: close <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8"> <TITLE>301 Moved</TITLE></HEAD><BODY> <H1>301 Moved</H1> The document has moved <A HREF="http://www.google.co.uk/">here</A>. </BODY></HTML> Closing Done
Example #2 HTTP client using asynchronous DNS resolver
<?php
/*
* 1. Connect to 127.0.0.1 at port 80
* by means of EventBufferEvent::connect().
*
* 2. Request /index.cphp via HTTP/1.0
* using the output buffer.
*
* 3. Asyncronously read the response and print it to stdout.
*/
// Read callback
function readcb($bev, $base) {
$input = $bev->getInput();
while (($n = $input->remove($buf, 1024)) > 0) {
echo $buf;
}
}
// Event callback
function eventcb($bev, $events, $base) {
if ($events & EventBufferEvent::CONNECTED) {
echo "Connected.\n";
} elseif ($events & (EventBufferEvent::ERROR | EventBufferEvent::EOF)) {
if ($events & EventBufferEvent::ERROR) {
echo "DNS error: ", $bev->getDnsErrorString(), PHP_EOL;
}
echo "Closing\n";
$base->exit();
exit("Done\n");
}
}
$base = new EventBase();
echo "step 1\n";
$bev = new EventBufferEvent($base, /* use internal socket */ NULL,
EventBufferEvent::OPT_CLOSE_ON_FREE | EventBufferEvent::OPT_DEFER_CALLBACKS);
if (!$bev) {
exit("Failed creating bufferevent socket\n");
}
echo "step 2\n";
$bev->setCallbacks("readcb", /* writecb */ NULL, "eventcb", $base);
$bev->enable(Event::READ | Event::WRITE);
echo "step 3\n";
// Send request
$output = $bev->getOutput();
if (!$output->add(
"GET /index.cphp HTTP/1.0\r\n".
"Connection: Close\r\n\r\n"
)) {
exit("Failed adding request to output buffer\n");
}
/* Connect to the host syncronously.
We know the IP, and don't need to resolve DNS. */
if (!$bev->connect("127.0.0.1:80")) {
exit("Can't connect to host\n");
}
// Dispatch pending events
$base->dispatch();
?>
Example #3 Echo server
<?php
/*
* Simple echo server based on libevent's connection listener.
*
* Usage:
* 1) In one terminal window run:
*
* $ php listener.php 9881
*
* 2) In another terminal window open up connection, e.g.:
*
* $ nc 127.0.0.1 9881
*
* 3) start typing. The server should repeat the input.
*/
class MyListenerConnection {
private $bev, $base;
public function __destruct() {
$this->bev->free();
}
public function __construct($base, $fd) {
$this->base = $base;
$this->bev = new EventBufferEvent($base, $fd, EventBufferEvent::OPT_CLOSE_ON_FREE);
$this->bev->setCallbacks(array($this, "echoReadCallback"), NULL,
array($this, "echoEventCallback"), NULL);
if (!$this->bev->enable(Event::READ)) {
echo "Failed to enable READ\n";
return;
}
}
public function echoReadCallback($bev, $ctx) {
// Copy all the data from the input buffer to the output buffer
// Variant #1
$bev->output->addBuffer($bev->input);
/* Variant #2 */
/*
$input = $bev->getInput();
$output = $bev->getOutput();
$output->addBuffer($input);
*/
}
public function echoEventCallback($bev, $events, $ctx) {
if ($events & EventBufferEvent::ERROR) {
echo "Error from bufferevent\n";
}
if ($events & (EventBufferEvent::EOF | EventBufferEvent::ERROR)) {
//$bev->free();
$this->__destruct();
}
}
}
class MyListener {
public $base,
$listener,
$socket;
private $conn = array();
public function __destruct() {
foreach ($this->conn as &$c) $c = NULL;
}
public function __construct($port) {
$this->base = new EventBase();
if (!$this->base) {
echo "Couldn't open event base";
exit(1);
}
// Variant #1
/*
$this->socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if (!socket_bind($this->socket, '0.0.0.0', $port)) {
echo "Unable to bind socket\n";
exit(1);
}
$this->listener = new EventListener($this->base,
array($this, "acceptConnCallback"), $this->base,
EventListener::OPT_CLOSE_ON_FREE | EventListener::OPT_REUSEABLE,
-1, $this->socket);
*/
// Variant #2
$this->listener = new EventListener($this->base,
array($this, "acceptConnCallback"), $this->base,
EventListener::OPT_CLOSE_ON_FREE | EventListener::OPT_REUSEABLE, -1,
"0.0.0.0:$port");
if (!$this->listener) {
echo "Couldn't create listener";
exit(1);
}
$this->listener->setErrorCallback(array($this, "accept_error_cb"));
}
public function dispatch() {
$this->base->dispatch();
}
// This callback is invoked when there is data to read on $bev
public function acceptConnCallback($listener, $fd, $address, $ctx) {
// We got a new connection! Set up a bufferevent for it. */
$base = $this->base;
$this->conn[] = new MyListenerConnection($base, $fd);
}
public function accept_error_cb($listener, $ctx) {
$base = $this->base;
fprintf(STDERR, "Got an error %d (%s) on the listener. "
."Shutting down.\n",
EventUtil::getLastSocketErrno(),
EventUtil::getLastSocketError());
$base->exit(NULL);
}
}
$port = 9808;
if ($argc > 1) {
$port = (int) $argv[1];
}
if ($port <= 0 || $port > 65535) {
exit("Invalid port");
}
$l = new MyListener($port);
$l->dispatch();
?>
Example #4 SSL echo server
<?php
/*
* SSL echo server
*
* To test:
* 1) Run:
* $ php examples/ssl-echo-server/server.php 9998
*
* 2) in another terminal window run:
* $ socat - SSL:127.0.0.1:9998,verify=1,cafile=examples/ssl-echo-server/cert.pem
*/
class MySslEchoServer {
public $port,
$base,
$bev,
$listener,
$ctx;
function __construct ($port, $host = "127.0.0.1") {
$this->port = $port;
$this->ctx = $this->init_ssl();
if (!$this->ctx) {
exit("Failed creating SSL context\n");
}
$this->base = new EventBase();
if (!$this->base) {
exit("Couldn't open event base\n");
}
$this->listener = new EventListener($this->base,
array($this, "ssl_accept_cb"), $this->ctx,
EventListener::OPT_CLOSE_ON_FREE | EventListener::OPT_REUSEABLE,
-1, "$host:$port");
if (!$this->listener) {
exit("Couldn't create listener\n");
}
$this->listener->setErrorCallback(array($this, "accept_error_cb"));
}
function dispatch() {
$this->base->dispatch();
}
// This callback is invoked when there is data to read on $bev.
function ssl_read_cb($bev, $ctx) {
$in = $bev->input; //$bev->getInput();
printf("Received %zu bytes\n", $in->length);
printf("----- data ----\n");
printf("%ld:\t%s\n", (int) $in->length, $in->pullup(-1));
$bev->writeBuffer($in);
}
// This callback is invoked when some even occurs on the event listener,
// e.g. connection closed, or an error occured
function ssl_event_cb($bev, $events, $ctx) {
if ($events & EventBufferEvent::ERROR) {
// Fetch errors from the SSL error stack
while ($err = $bev->sslError()) {
fprintf(STDERR, "Bufferevent error %s.\n", $err);
}
}
if ($events & (EventBufferEvent::EOF | EventBufferEvent::ERROR)) {
$bev->free();
}
}
// This callback is invoked when a client accepts new connection
function ssl_accept_cb($listener, $fd, $address, $ctx) {
// We got a new connection! Set up a bufferevent for it.
$this->bev = EventBufferEvent::sslSocket($this->base, $fd, $this->ctx,
EventBufferEvent::SSL_ACCEPTING, EventBufferEvent::OPT_CLOSE_ON_FREE);
if (!$this->bev) {
echo "Failed creating ssl buffer\n";
$this->base->exit(NULL);
exit(1);
}
$this->bev->enable(Event::READ);
$this->bev->setCallbacks(array($this, "ssl_read_cb"), NULL,
array($this, "ssl_event_cb"), NULL);
}
// This callback is invoked when we failed to setup new connection for a client
function accept_error_cb($listener, $ctx) {
fprintf(STDERR, "Got an error %d (%s) on the listener. "
."Shutting down.\n",
EventUtil::getLastSocketErrno(),
EventUtil::getLastSocketError());
$this->base->exit(NULL);
}
// Initialize SSL structures, create an EventSslContext
// Optionally create self-signed certificates
function init_ssl() {
// We *must* have entropy. Otherwise there's no point to crypto.
if (!EventUtil::sslRandPoll()) {
exit("EventUtil::sslRandPoll failed\n");
}
$local_cert = __DIR__."/cert.pem";
$local_pk = __DIR__."/privkey.pem";
if (!file_exists($local_cert) || !file_exists($local_pk)) {
echo "Couldn't read $local_cert or $local_pk file. To generate a key\n",
"and self-signed certificate, run:\n",
" openssl genrsa -out $local_pk 2048\n",
" openssl req -new -key $local_pk -out cert.req\n",
" openssl x509 -req -days 365 -in cert.req -signkey $local_pk -out $local_cert\n";
return FALSE;
}
$ctx = new EventSslContext(EventSslContext::SSLv3_SERVER_METHOD, array (
EventSslContext::OPT_LOCAL_CERT => $local_cert,
EventSslContext::OPT_LOCAL_PK => $local_pk,
//EventSslContext::OPT_PASSPHRASE => "echo server",
EventSslContext::OPT_VERIFY_PEER => true,
EventSslContext::OPT_ALLOW_SELF_SIGNED => false,
));
return $ctx;
}
}
// Allow to override the port
$port = 9999;
if ($argc > 1) {
$port = (int) $argv[1];
}
if ($port <= 0 || $port > 65535) {
exit("Invalid port\n");
}
$l = new MySslEchoServer($port);
$l->dispatch();
?>
Example #5 Signal handler
<?php
/*
Launch it in a terminal window:
$ php examples/signal.php
In another terminal window find out the pid and send SIGTERM, e.g.:
$ ps aux | grep examp
ruslan 3976 0.2 0.0 139896 11256 pts/1 S+ 10:25 0:00 php examples/signal.php
ruslan 3978 0.0 0.0 9572 864 pts/2 S+ 10:26 0:00 grep --color=auto examp
$ kill -TERM 3976
At the first terminal window you should catch the following:
Caught signal 15
*/
class MyEventSignal {
private $base;
function __construct($base) {
$this->base = $base;
}
function eventSighandler($no, $c) {
echo "Caught signal $no\n";
event_base_loopexit($c->base);
}
}
$base = event_base_new();
$c = new MyEventSignal($base);
$no = SIGTERM;
$ev = evsignal_new($base, $no, array($c,'eventSighandler'), $c);
evsignal_add($ev);
event_base_loop($base);
?>
Example #6 Use libevent's loop to process requests of `eio' extension
<?php
// Callback for eio_nop()
function my_nop_cb($d, $r) {
echo "step 6\n";
}
$dir = "/tmp/abc-eio-temp";
if (file_exists($dir)) {
rmdir($dir);
}
echo "step 1\n";
$base = new EventBase();
echo "step 2\n";
eio_init();
eio_mkdir($dir, 0750, EIO_PRI_DEFAULT, "my_nop_cb");
$event = new Event($base, eio_get_event_stream(),
Event::READ | Event::PERSIST, function ($fd, $events, $base) {
echo "step 5\n";
while (eio_nreqs()) {
eio_poll();
}
$base->stop();
}, $base);
echo "step 3\n";
$event->add();
echo "step 4\n";
$base->dispatch();
echo "Done\n";
?>
Example #7 Miscellaneous
<?php
/* {{{ Config & supported stuff */
echo "Supported methods:\n";
foreach (Event::getSupportedMethods() as $m) {
echo $m, PHP_EOL;
}
// Avoiding "select" method
$cfg = new EventConfig();
if ($cfg->avoidMethod("select")) {
echo "`select' method avoided\n";
}
// Create event_base associated with the config
$base = new EventBase($cfg);
echo "Event method used: ", $base->getMethod(), PHP_EOL;
echo "Features:\n";
$features = $base->getFeatures();
($features & EventConfig::FEATURE_ET) and print("ET - edge-triggered IO\n");
($features & EventConfig::FEATURE_O1) and print("O1 - O(1) operation for adding/deletting events\n");
($features & EventConfig::FEATURE_FDS) and print("FDS - arbitrary file descriptor types, and not just sockets\n");
// Require FDS feature
if ($cfg->requireFeatures(EventConfig::FEATURE_FDS)) {
echo "FDS feature is now requried\n";
$base = new EventBase($cfg);
($base->getFeatures() & EventConfig::FEATURE_FDS)
and print("FDS - arbitrary file descriptor types, and not just sockets\n");
}
/* }}} */
/* {{{ Base */
$base = new EventBase();
$event = new Event($base, STDIN, Event::READ | Event::PERSIST, function ($fd, $events, $arg) {
static $max_iterations = 0;
if (++$max_iterations >= 5) {
/* exit after 5 iterations with timeout of 2.33 seconds */
echo "Stopping...\n";
$arg[0]->exit(2.33);
}
echo fgets($fd);
}, array (&$base));
$event->add();
$base->loop();
/* Base }}} */
?>
Example #8 Simple HTTP server
<?php
/*
* Simple HTTP server.
*
* To test it:
* 1) Run it on a port of your choice, e.g.:
* $ php examples/http.php 8010
* 2) In another terminal connect to some address on this port
* and make GET or POST request(others are turned off here), e.g.:
* $ nc -t 127.0.0.1 8010
* POST /about HTTP/1.0
* Content-Type: text/plain
* Content-Length: 4
* Connection: close
* (press Enter)
*
* It will output
* a=12
* HTTP/1.0 200 OK
* Content-Type: text/html; charset=ISO-8859-1
* Connection: close
*
* $ nc -t 127.0.0.1 8010
* GET /dump HTTP/1.0
* Content-Type: text/plain
* Content-Encoding: UTF-8
* Connection: close
* (press Enter)
*
* It will output:
* HTTP/1.0 200 OK
* Content-Type: text/html; charset=ISO-8859-1
* Connection: close
* (press Enter)
*
* $ nc -t 127.0.0.1 8010
* GET /unknown HTTP/1.0
* Connection: close
*
* It will output:
* HTTP/1.0 200 OK
* Content-Type: text/html; charset=ISO-8859-1
* Connection: close
*
* 3) See what the server outputs on the previous terminal window.
*/
function _http_dump($req, $data) {
static $counter = 0;
static $max_requests = 2;
if (++$counter >= $max_requests) {
echo "Counter reached max requests $max_requests. Exiting\n";
exit();
}
echo __METHOD__, " called\n";
echo "request:"; var_dump($req);
echo "data:"; var_dump($data);
echo "\n===== DUMP =====\n";
echo "Command:", $req->getCommand(), PHP_EOL;
echo "URI:", $req->getUri(), PHP_EOL;
echo "Input headers:"; var_dump($req->getInputHeaders());
echo "Output headers:"; var_dump($req->getOutputHeaders());
echo "\n >> Sending reply ...";
$req->sendReply(200, "OK");
echo "OK\n";
echo "\n >> Reading input buffer ...\n";
$buf = $req->getInputBuffer();
while ($s = $buf->readLine(EventBuffer::EOL_ANY)) {
echo $s, PHP_EOL;
}
echo "No more data in the buffer\n";
}
function _http_about($req) {
echo __METHOD__, PHP_EOL;
echo "URI: ", $req->getUri(), PHP_EOL;
echo "\n >> Sending reply ...";
$req->sendReply(200, "OK");
echo "OK\n";
}
function _http_default($req, $data) {
echo __METHOD__, PHP_EOL;
echo "URI: ", $req->getUri(), PHP_EOL;
echo "\n >> Sending reply ...";
$req->sendReply(200, "OK");
echo "OK\n";
}
$port = 8010;
if ($argc > 1) {
$port = (int) $argv[1];
}
if ($port <= 0 || $port > 65535) {
exit("Invalid port");
}
$base = new EventBase();
$http = new EventHttp($base);
$http->setAllowedMethods(EventHttpRequest::CMD_GET | EventHttpRequest::CMD_POST);
$http->setCallback("/dump", "_http_dump", array(4, 8));
$http->setCallback("/about", "_http_about");
$http->setDefaultCallback("_http_default", "custom data value");
$http->bind("0.0.0.0", 8010);
$base->loop();
?>
以上例程的输出类似于：
a=12 HTTP/1.0 200 OK Content-Type: text/html; charset=ISO-8859-1 Connection: close HTTP/1.0 200 OK Content-Type: text/html; charset=ISO-8859-1 Connection: close (press Enter) HTTP/1.0 200 OK Content-Type: text/html; charset=ISO-8859-1 Connection: close
Example #9 EventHttpConnection::makeRequest() example
<?php
function _request_handler($req, $base) {
echo __FUNCTION__, PHP_EOL;
if (is_null($req)) {
echo "Timed out\n";
} else {
$response_code = $req->getResponseCode();
if ($response_code == 0) {
echo "Connection refused\n";
} elseif ($response_code != 200) {
echo "Unexpected response: $response_code\n";
} else {
echo "Success: $response_code\n";
$buf = $req->getInputBuffer();
echo "Body:\n";
while ($s = $buf->readLine(EventBuffer::EOL_ANY)) {
echo $s, PHP_EOL;
}
}
}
$base->exit(NULL);
}
$address = "127.0.0.1";
$port = 80;
$base = new EventBase();
$conn = new EventHttpConnection($base, NULL, $address, $port);
$conn->setTimeout(5);
$req = new EventHttpRequest("_request_handler", $base);
$req->addHeader("Host", $address, EventHttpRequest::OUTPUT_HEADER);
$req->addHeader("Content-Length", "0", EventHttpRequest::OUTPUT_HEADER);
$conn->makeRequest($req, EventHttpRequest::CMD_GET, "/index.cphp");
$base->loop();
?>
以上例程的输出类似于：
_request_handler Success: 200 Body: PHP, date: 2013-03-13T20:27:52+05:00
Example #10 Connection listener based on a UNIX domain socket
<?php
/*
* Simple echo server based on libevent's connection listener.
*
* Usage:
* 1) In one terminal window run:
*
* $ php unix-domain-listener.php [path-to-socket]
*
* 2) In another terminal window open up connection
* to the socket, e.g.:
*
* $ socat - GOPEN:/tmp/1.sock
*
* 3) Start typing. The server should repeat the input.
*/
class MyListenerConnection {
private $bev, $base;
public function __destruct() {
if ($this->bev) {
$this->bev->free();
}
}
public function __construct($base, $fd) {
$this->base = $base;
$this->bev = new EventBufferEvent($base, $fd, EventBufferEvent::OPT_CLOSE_ON_FREE);
$this->bev->setCallbacks(array($this, "echoReadCallback"), NULL,
array($this, "echoEventCallback"), NULL);
if (!$this->bev->enable(Event::READ)) {
echo "Failed to enable READ\n";
return;
}
}
public function echoReadCallback($bev, $ctx) {
// Copy all the data from the input buffer to the output buffer
$bev->output->addBuffer($bev->input);
}
public function echoEventCallback($bev, $events, $ctx) {
if ($events & EventBufferEvent::ERROR) {
echo "Error from bufferevent\n";
}
if ($events & (EventBufferEvent::EOF | EventBufferEvent::ERROR)) {
$bev->free();
$bev = NULL;
}
}
}
class MyListener {
public $base,
$listener,
$socket;
private $conn = array();
public function __destruct() {
foreach ($this->conn as &$c) $c = NULL;
}
public function __construct($sock_path) {
$this->base = new EventBase();
if (!$this->base) {
echo "Couldn't open event base";
exit(1);
}
if (file_exists($sock_path)) {
unlink($sock_path);
}
$this->listener = new EventListener($this->base,
array($this, "acceptConnCallback"), $this->base,
EventListener::OPT_CLOSE_ON_FREE | EventListener::OPT_REUSEABLE, -1,
"unix:$sock_path");
if (!$this->listener) {
trigger_error("Couldn't create listener", E_USER_ERROR);
}
$this->listener->setErrorCallback(array($this, "accept_error_cb"));
}
public function dispatch() {
$this->base->dispatch();
}
// This callback is invoked when there is data to read on $bev
public function acceptConnCallback($listener, $fd, $address, $ctx) {
// We got a new connection! Set up a bufferevent for it. */
$base = $this->base;
$this->conn[] = new MyListenerConnection($base, $fd);
}
public function accept_error_cb($listener, $ctx) {
$base = $this->base;
fprintf(STDERR, "Got an error %d (%s) on the listener. "
."Shutting down.\n",
EventUtil::getLastSocketErrno(),
EventUtil::getLastSocketError());
$base->exit(NULL);
}
}
if ($argc <= 1) {
exit("Socket path is not provided\n");
}
$sock_path = $argv[1];
$l = new MyListener($sock_path);
$l->dispatch();
?>