Examples
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"
);
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");
}
$base->dispatch();
?>
The above example will output something similar to:
Connected. HTTP/1.1 301 Moved Permanently Date: Fri, 01 Mar 2013 18:47:48 GMT Location: http://www.google.co.uk/ Content-Type: text/html; charset=UTF-8 Cache-Control: public, max-age=2592000 Server: gws Content-Length: 221 X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Age: 133438 Expires: Sat, 30 Mar 2013 05:39:28 GMT Connection: close <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8"> <TITLE>301 Moved</TITLE></HEAD><BODY> <H1>301 Moved</H1> The document has moved <A HREF="http://www.google.co.uk/">here</A>. </BODY></HTML> Closing Done
Example #2 HTTP client using asynchronous DNS resolver
<?php
/*
* 1. Connect to 127.0.0.1 at port 80
* by means of EventBufferEvent::connect().
*
* 2. Request /index.cphp via HTTP/1.0
* using the output buffer.
*
* 3. Asyncronously read the response and print it to stdout.
*/
// Read callback
function readcb($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 occurred
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);
$base->loop();
?>
The above example will output something similar to:
a=12 HTTP/1.0 200 OK Content-Type: text/html; charset=ISO-8859-1 Connection: close HTTP/1.0 200 OK Content-Type: text/html; charset=ISO-8859-1 Connection: close (press Enter) HTTP/1.0 200 OK Content-Type: text/html; charset=ISO-8859-1 Connection: close
Example #9 Simple HTTPS server
<?php
/*
* Simple HTTPS server.
*
* 1) Run the server: `php examples/https.php 9999`
* 2) Test it: `php examples/ssl-connection.php 9999`
*/
function _http_dump($req, $data) {
static $counter = 0;
static $max_requests = 200;
if (++$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";
$buf = $req->getInputBuffer();
echo "\n >> Reading input buffer (", $buf->length, ") ...\n";
while ($s = $buf->read(1024)) {
echo $s;
}
echo "\nNo more data in the buffer\n";
}
function _http_about($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 ...";
$req->sendReply(200, "OK");
echo "OK\n";
}
function _http_400($req) {
$req->sendError(400);
}
function _init_ssl() {
$local_cert = __DIR__."/ssl-echo-server/cert.pem";
$local_pk = __DIR__."/ssl-echo-server/privkey.pem";
$ctx = new EventSslContext(EventSslContext::SSLv3_SERVER_METHOD, array (
EventSslContext::OPT_LOCAL_CERT => $local_cert,
EventSslContext::OPT_LOCAL_PK => $local_pk,
//EventSslContext::OPT_PASSPHRASE => "test",
EventSslContext::OPT_ALLOW_SELF_SIGNED => true,
));
return $ctx;
}
$port = 9999;
if ($argc > 1) {
$port = (int) $argv[1];
}
if ($port <= 0 || $port > 65535) {
exit("Invalid port");
}
$ip = '0.0.0.0';
$base = new EventBase();
$ctx = _init_ssl();
$http = new EventHttp($base, $ctx);
$http->setAllowedMethods(EventHttpRequest::CMD_GET | EventHttpRequest::CMD_POST);
$http->setCallback("/dump", "_http_dump", array(4, 8));
$http->setCallback("/about", "_http_about");
$http->setCallback("/err400", "_http_400");
$http->setDefaultCallback("_http_default", "custom data value");
$http->bind($ip, $port);
$base->dispatch();
Example #10 OpenSSL connection
<?php
/*
* Sample OpenSSL client.
*
* Usage:
* 1) Launch a server, e.g.:
* $ php examples/https.php 9999
*
* 2) Launch the client in another terminal:
* $ php examples/ssl-connection.php 9999
*/
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);
}
function _init_ssl() {
$ctx = new EventSslContext(EventSslContext::SSLv3_CLIENT_METHOD, array ());
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");
}
$host = '127.0.0.1';
$ctx = _init_ssl();
if (!$ctx) {
trigger_error("Failed creating SSL context", E_USER_ERROR);
}
$base = new EventBase();
if (!$base) {
trigger_error("Failed to initialize event base", E_USER_ERROR);
}
$conn = new EventHttpConnection($base, NULL, $host, $port, $ctx);
$conn->setTimeout(50);
$req = new EventHttpRequest("_request_handler", $base);
$req->addHeader("Host", $host, EventHttpRequest::OUTPUT_HEADER);
$buf = $req->getOutputBuffer();
$buf->add("<html>HTML TEST</html>");
//$req->addHeader("Content-Length", $buf->length, EventHttpRequest::OUTPUT_HEADER);
//$req->addHeader("Connection", "close", EventHttpRequest::OUTPUT_HEADER);
$conn->makeRequest($req, EventHttpRequest::CMD_POST, "/dump");
$base->dispatch();
echo "END\n";
?>
Example #11 EventHttpConnection::makeRequest() example
<?php
function _request_handler($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();
?>
The above example will output something similar to:
_request_handler Success: 200 Body: PHP, date: 2013-03-13T20:27:52+05:00
Example #12 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();
?>
Example #13 Simple SMTP server
<?php
/*
* Author: Andrew Rose <hello at andrewrose dot co dot uk>
*
* Usage:
* 1) Prepare cert.pem certificate and privkey.pem private key files.
* 2) Launch the server script
* 3) Open TLS connection, e.g.:
* $ openssl s_client -connect localhost:25 -starttls smtp -crlf
* 4) Start testing the commands listed in `cmd` method below.
*/
class Handler {
public $domainName = FALSE;
public $connections = [];
public $buffers = [];
public $maxRead = 256000;
public function __construct() {
$this->ctx = new EventSslContext(EventSslContext::SSLv3_SERVER_METHOD, [
EventSslContext::OPT_LOCAL_CERT => 'cert.pem',
EventSslContext::OPT_LOCAL_PK => 'privkey.pem',
//EventSslContext::OPT_PASSPHRASE => '',
EventSslContext::OPT_VERIFY_PEER => false, // change to true with authentic cert
EventSslContext::OPT_ALLOW_SELF_SIGNED => true // change to false with authentic cert
]);
$this->base = new EventBase();
if (!$this->base) {
exit("Couldn't open event base\n");
}
if (!$this->listener = new EventListener($this->base,
[$this, 'ev_accept'],
$this->ctx,
EventListener::OPT_CLOSE_ON_FREE | EventListener::OPT_REUSEABLE,
-1,
'0.0.0.0:25'))
{
exit("Couldn't create listener\n");
}
$this->listener->setErrorCallback([$this, 'ev_error']);
$this->base->dispatch();
}
public function ev_accept($listener, $fd, $address, $ctx) {
static $id = 0;
$id += 1;
$this->connections[$id]['clientData'] = '';
$this->connections[$id]['cnx'] = new EventBufferEvent($this->base, $fd,
EventBufferEvent::OPT_CLOSE_ON_FREE);
if (!$this->connections[$id]['cnx']) {
echo "Failed creating buffer\n";
$this->base->exit(NULL);
exit(1);
}
$this->connections[$id]['cnx']->setCallbacks([$this, "ev_read"], NULL,
[$this, 'ev_error'], $id);
$this->connections[$id]['cnx']->enable(Event::READ | Event::WRITE);
$this->ev_write($id, '220 '.$this->domainName." wazzzap?\r\n");
}
function ev_error($listener, $ctx) {
$errno = EventUtil::getLastSocketErrno();
fprintf(STDERR, "Got an error %d (%s) on the listener. Shutting down.\n",
$errno, EventUtil::getLastSocketError());
if ($errno != 0) {
$this->base->exit(NULL);
exit();
}
}
public function ev_close($id) {
$this->connections[$id]['cnx']->disable(Event::READ | Event::WRITE);
unset($this->connections[$id]);
}
protected function ev_write($id, $string) {
echo 'S('.$id.'): '.$string;
$this->connections[$id]['cnx']->write($string);
}
public function ev_read($buffer, $id) {
while($buffer->input->length > 0) {
$this->connections[$id]['clientData'] .= $buffer->input->read($this->maxRead);
$clientDataLen = strlen($this->connections[$id]['clientData']);
if($this->connections[$id]['clientData'][$clientDataLen-1] == "\n"
&& $this->connections[$id]['clientData'][$clientDataLen-2] == "\r")
{
// remove the trailing \r\n
$line = substr($this->connections[$id]['clientData'], 0,
strlen($this->connections[$id]['clientData']) - 2);
$this->connections[$id]['clientData'] = '';
$this->cmd($buffer, $id, $line);
}
}
}
protected function cmd($buffer, $id, $line) {
switch ($line) {
case strncmp('EHLO ', $line, 4):
$this->ev_write($id, "250-STARTTLS\r\n");
$this->ev_write($id, "250 OK ehlo\r\n");
break;
case strncmp('HELO ', $line, 4):
$this->ev_write($id, "250-STARTTLS\r\n");
$this->ev_write($id, "250 OK helo\r\n");
break;
case strncmp('QUIT', $line, 3):
$this->ev_write($id, "250 OK quit\r\n");
$this->ev_close($id);
break;
case strncmp('STARTTLS', $line, 3):
$this->ev_write($id, "220 Ready to start TLS\r\n");
$this->connections[$id]['cnx'] = EventBufferEvent::sslFilter($this->base,
$this->connections[$id]['cnx'], $this->ctx,
EventBufferEvent::SSL_ACCEPTING,
EventBufferEvent::OPT_CLOSE_ON_FREE);
$this->connections[$id]['cnx']->setCallbacks([$this, "ev_read"], NULL, [$this, 'ev_error'], $id);
$this->connections[$id]['cnx']->enable(Event::READ | Event::WRITE);
break;
default:
echo 'unknown command: '.$line."\n";
break;
}
}
}
new Handler();
Vertaling niet beschikbaar
De PHP-handleiding is nog niet in het Nederlands vertaald, dus het scherm is in het Engels. Als u wilt, kunt u het ook in het Frans of in het Duits raadplegen.
Als je de moed voelt, kun je je vertaling aanbieden ;-)
Nederlandse vertaling
U hebt gevraagd om deze site in het Nederlands te bezoeken. Voor nu wordt alleen de interface vertaald, maar nog niet alle inhoud.Als je me wilt helpen met vertalingen, is je bijdrage welkom. Het enige dat u hoeft te doen, is u op de site registreren en mij een bericht sturen waarin u wordt gevraagd om u toe te voegen aan de groep vertalers, zodat u de gewenste pagina's kunt vertalen. Een link onderaan elke vertaalde pagina geeft aan dat u de vertaler bent en heeft een link naar uw profiel.
Bij voorbaat dank.
Document heeft de 30/01/2003 gemaakt, de laatste keer de 26/10/2018 gewijzigd
Bron van het afgedrukte document:https://www.gaudry.be/nl/php-rf-event.examples.html
De infobrol is een persoonlijke site waarvan de inhoud uitsluitend mijn verantwoordelijkheid is. De tekst is beschikbaar onder CreativeCommons-licentie (BY-NC-SA). Meer info op de gebruiksvoorwaarden en de auteur.
Referenties
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De auteur Deze site is als enige verantwoordelijk voor de manier waarop de verschillende concepten, en de vrijheden die met de referentiewerken worden genomen, hier worden gepresenteerd. Vergeet niet dat u meerdere broninformatie moet doorgeven om het risico op fouten te verkleinen.