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<?php
/**
* HTTP service client
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Class to handle concurrent HTTP requests
*
* HTTP request maps are arrays that use the following format:
* - method : GET/HEAD/PUT/POST/DELETE
* - url : HTTP/HTTPS URL
* - query : <query parameter field/value associative array> (uses RFC 3986)
* - headers : <header name/value associative array>
* - body : source to get the HTTP request body from;
* this can simply be a string (always), a resource for
* PUT requests, and a field/value array for POST request;
* array bodies are encoded as multipart/form-data and strings
* use application/x-www-form-urlencoded (headers sent automatically)
* - stream : resource to stream the HTTP response body to
* - proxy : HTTP proxy to use
* Request maps can use integer index 0 instead of 'method' and 1 instead of 'url'.
*
* @author Aaron Schulz
* @since 1.23
*/
class MultiHttpClient {
/** @var resource */
protected $multiHandle = null; // curl_multi handle
/** @var string|null SSL certificates path */
protected $caBundlePath;
/** @var integer */
protected $connTimeout = 10;
/** @var integer */
protected $reqTimeout = 300;
/** @var bool */
protected $usePipelining = false;
/** @var integer */
protected $maxConnsPerHost = 50;
/** @var string|null proxy */
protected $proxy;
/** @var string */
protected $userAgent = 'wikimedia/multi-http-client v1.0';
/**
* @param array $options
* - connTimeout : default connection timeout (seconds)
* - reqTimeout : default request timeout (seconds)
* - proxy : HTTP proxy to use
* - usePipelining : whether to use HTTP pipelining if possible (for all hosts)
* - maxConnsPerHost : maximum number of concurrent connections (per host)
* - userAgent : The User-Agent header value to send
* @throws Exception
*/
public function __construct( array $options ) {
if ( isset( $options['caBundlePath'] ) ) {
$this->caBundlePath = $options['caBundlePath'];
if ( !file_exists( $this->caBundlePath ) ) {
throw new Exception( "Cannot find CA bundle: " . $this->caBundlePath );
}
}
static $opts = [
'connTimeout', 'reqTimeout', 'usePipelining', 'maxConnsPerHost', 'proxy', 'userAgent'
];
foreach ( $opts as $key ) {
if ( isset( $options[$key] ) ) {
$this->$key = $options[$key];
}
}
}
/**
* Execute an HTTP(S) request
*
* This method returns a response map of:
* - code : HTTP response code or 0 if there was a serious cURL error
* - reason : HTTP response reason (empty if there was a serious cURL error)
* - headers : <header name/value associative array>
* - body : HTTP response body or resource (if "stream" was set)
* - error : Any cURL error string
* The map also stores integer-indexed copies of these values. This lets callers do:
* @code
* list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $http->run( $req );
* @endcode
* @param array $req HTTP request array
* @param array $opts
* - connTimeout : connection timeout per request (seconds)
* - reqTimeout : post-connection timeout per request (seconds)
* @return array Response array for request
*/
final public function run( array $req, array $opts = [] ) {
return $this->runMulti( [ $req ], $opts )[0]['response'];
}
/**
* Execute a set of HTTP(S) requests concurrently
*
* The maps are returned by this method with the 'response' field set to a map of:
* - code : HTTP response code or 0 if there was a serious cURL error
* - reason : HTTP response reason (empty if there was a serious cURL error)
* - headers : <header name/value associative array>
* - body : HTTP response body or resource (if "stream" was set)
* - error : Any cURL error string
* The map also stores integer-indexed copies of these values. This lets callers do:
* @code
* list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $req['response'];
* @endcode
* All headers in the 'headers' field are normalized to use lower case names.
* This is true for the request headers and the response headers. Integer-indexed
* method/URL entries will also be changed to use the corresponding string keys.
*
* @param array $reqs Map of HTTP request arrays
* @param array $opts
* - connTimeout : connection timeout per request (seconds)
* - reqTimeout : post-connection timeout per request (seconds)
* - usePipelining : whether to use HTTP pipelining if possible
* - maxConnsPerHost : maximum number of concurrent connections (per host)
* @return array $reqs With response array populated for each
* @throws Exception
*/
public function runMulti( array $reqs, array $opts = [] ) {
$chm = $this->getCurlMulti();
// Normalize $reqs and add all of the required cURL handles...
$handles = [];
foreach ( $reqs as $index => &$req ) {
$req['response'] = [
'code' => 0,
'reason' => '',
'headers' => [],
'body' => '',
'error' => ''
];
if ( isset( $req[0] ) ) {
$req['method'] = $req[0]; // short-form
unset( $req[0] );
}
if ( isset( $req[1] ) ) {
$req['url'] = $req[1]; // short-form
unset( $req[1] );
}
if ( !isset( $req['method'] ) ) {
throw new Exception( "Request has no 'method' field set." );
} elseif ( !isset( $req['url'] ) ) {
throw new Exception( "Request has no 'url' field set." );
}
$req['query'] = isset( $req['query'] ) ? $req['query'] : [];
$headers = []; // normalized headers
if ( isset( $req['headers'] ) ) {
foreach ( $req['headers'] as $name => $value ) {
$headers[strtolower( $name )] = $value;
}
}
$req['headers'] = $headers;
if ( !isset( $req['body'] ) ) {
$req['body'] = '';
$req['headers']['content-length'] = 0;
}
$handles[$index] = $this->getCurlHandle( $req, $opts );
if ( count( $reqs ) > 1 ) {
// https://github.com/guzzle/guzzle/issues/349
curl_setopt( $handles[$index], CURLOPT_FORBID_REUSE, true );
}
}
unset( $req ); // don't assign over this by accident
$indexes = array_keys( $reqs );
if ( function_exists( 'curl_multi_setopt' ) ) { // PHP 5.5
if ( isset( $opts['usePipelining'] ) ) {
curl_multi_setopt( $chm, CURLMOPT_PIPELINING, (int)$opts['usePipelining'] );
}
if ( isset( $opts['maxConnsPerHost'] ) ) {
// Keep these sockets around as they may be needed later in the request
curl_multi_setopt( $chm, CURLMOPT_MAXCONNECTS, (int)$opts['maxConnsPerHost'] );
}
}
// @TODO: use a per-host rolling handle window (e.g. CURLMOPT_MAX_HOST_CONNECTIONS)
$batches = array_chunk( $indexes, $this->maxConnsPerHost );
$infos = [];
foreach ( $batches as $batch ) {
// Attach all cURL handles for this batch
foreach ( $batch as $index ) {
curl_multi_add_handle( $chm, $handles[$index] );
}
// Execute the cURL handles concurrently...
$active = null; // handles still being processed
do {
// Do any available work...
do {
$mrc = curl_multi_exec( $chm, $active );
$info = curl_multi_info_read( $chm );
if ( $info !== false ) {
$infos[(int)$info['handle']] = $info;
}
} while ( $mrc == CURLM_CALL_MULTI_PERFORM );
// Wait (if possible) for available work...
if ( $active > 0 && $mrc == CURLM_OK ) {
if ( curl_multi_select( $chm, 10 ) == -1 ) {
// PHP bug 63411; http://curl.haxx.se/libcurl/c/curl_multi_fdset.html
usleep( 5000 ); // 5ms
}
}
} while ( $active > 0 && $mrc == CURLM_OK );
}
// Remove all of the added cURL handles and check for errors...
foreach ( $reqs as $index => &$req ) {
$ch = $handles[$index];
curl_multi_remove_handle( $chm, $ch );
if ( isset( $infos[(int)$ch] ) ) {
$info = $infos[(int)$ch];
$errno = $info['result'];
if ( $errno !== 0 ) {
$req['response']['error'] = "(curl error: $errno)";
if ( function_exists( 'curl_strerror' ) ) {
$req['response']['error'] .= " " . curl_strerror( $errno );
}
}
} else {
$req['response']['error'] = "(curl error: no status set)";
}
// For convenience with the list() operator
$req['response'][0] = $req['response']['code'];
$req['response'][1] = $req['response']['reason'];
$req['response'][2] = $req['response']['headers'];
$req['response'][3] = $req['response']['body'];
$req['response'][4] = $req['response']['error'];
curl_close( $ch );
// Close any string wrapper file handles
if ( isset( $req['_closeHandle'] ) ) {
fclose( $req['_closeHandle'] );
unset( $req['_closeHandle'] );
}
}
unset( $req ); // don't assign over this by accident
// Restore the default settings
if ( function_exists( 'curl_multi_setopt' ) ) { // PHP 5.5
curl_multi_setopt( $chm, CURLMOPT_PIPELINING, (int)$this->usePipelining );
curl_multi_setopt( $chm, CURLMOPT_MAXCONNECTS, (int)$this->maxConnsPerHost );
}
return $reqs;
}
/**
* @param array $req HTTP request map
* @param array $opts
* - connTimeout : default connection timeout
* - reqTimeout : default request timeout
* @return resource
* @throws Exception
*/
protected function getCurlHandle( array &$req, array $opts = [] ) {
$ch = curl_init();
curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT,
isset( $opts['connTimeout'] ) ? $opts['connTimeout'] : $this->connTimeout );
curl_setopt( $ch, CURLOPT_PROXY, isset( $req['proxy'] ) ? $req['proxy'] : $this->proxy );
curl_setopt( $ch, CURLOPT_TIMEOUT,
isset( $opts['reqTimeout'] ) ? $opts['reqTimeout'] : $this->reqTimeout );
curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1 );
curl_setopt( $ch, CURLOPT_MAXREDIRS, 4 );
curl_setopt( $ch, CURLOPT_HEADER, 0 );
if ( !is_null( $this->caBundlePath ) ) {
curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, true );
curl_setopt( $ch, CURLOPT_CAINFO, $this->caBundlePath );
}
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
$url = $req['url'];
// PHP_QUERY_RFC3986 is PHP 5.4+ only
$query = str_replace(
[ '+', '%7E' ],
[ '%20', '~' ],
http_build_query( $req['query'], '', '&' )
);
if ( $query != '' ) {
$url .= strpos( $req['url'], '?' ) === false ? "?$query" : "&$query";
}
curl_setopt( $ch, CURLOPT_URL, $url );
curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, $req['method'] );
if ( $req['method'] === 'HEAD' ) {
curl_setopt( $ch, CURLOPT_NOBODY, 1 );
}
if ( $req['method'] === 'PUT' ) {
curl_setopt( $ch, CURLOPT_PUT, 1 );
if ( is_resource( $req['body'] ) ) {
curl_setopt( $ch, CURLOPT_INFILE, $req['body'] );
if ( isset( $req['headers']['content-length'] ) ) {
curl_setopt( $ch, CURLOPT_INFILESIZE, $req['headers']['content-length'] );
} elseif ( isset( $req['headers']['transfer-encoding'] ) &&
$req['headers']['transfer-encoding'] === 'chunks'
) {
curl_setopt( $ch, CURLOPT_UPLOAD, true );
} else {
throw new Exception( "Missing 'Content-Length' or 'Transfer-Encoding' header." );
}
} elseif ( $req['body'] !== '' ) {
$fp = fopen( "php://temp", "wb+" );
fwrite( $fp, $req['body'], strlen( $req['body'] ) );
rewind( $fp );
curl_setopt( $ch, CURLOPT_INFILE, $fp );
curl_setopt( $ch, CURLOPT_INFILESIZE, strlen( $req['body'] ) );
$req['_closeHandle'] = $fp; // remember to close this later
} else {
curl_setopt( $ch, CURLOPT_INFILESIZE, 0 );
}
curl_setopt( $ch, CURLOPT_READFUNCTION,
function ( $ch, $fd, $length ) {
$data = fread( $fd, $length );
$len = strlen( $data );
return $data;
}
);
} elseif ( $req['method'] === 'POST' ) {
curl_setopt( $ch, CURLOPT_POST, 1 );
// Don't interpret POST parameters starting with '@' as file uploads, because this
// makes it impossible to POST plain values starting with '@' (and causes security
// issues potentially exposing the contents of local files).
// The PHP manual says this option was introduced in PHP 5.5 defaults to true in PHP 5.6,
// but we support lower versions, and the option doesn't exist in HHVM 5.6.99.
if ( defined( 'CURLOPT_SAFE_UPLOAD' ) ) {
curl_setopt( $ch, CURLOPT_SAFE_UPLOAD, true );
} elseif ( is_array( $req['body'] ) ) {
// In PHP 5.2 and later, '@' is interpreted as a file upload if POSTFIELDS
// is an array, but not if it's a string. So convert $req['body'] to a string
// for safety.
$req['body'] = wfArrayToCgi( $req['body'] );
}
curl_setopt( $ch, CURLOPT_POSTFIELDS, $req['body'] );
} else {
if ( is_resource( $req['body'] ) || $req['body'] !== '' ) {
throw new Exception( "HTTP body specified for a non PUT/POST request." );
}
$req['headers']['content-length'] = 0;
}
if ( !isset( $req['headers']['user-agent'] ) ) {
$req['headers']['user-agent'] = $this->userAgent;
}
$headers = [];
foreach ( $req['headers'] as $name => $value ) {
if ( strpos( $name, ': ' ) ) {
throw new Exception( "Headers cannot have ':' in the name." );
}
$headers[] = $name . ': ' . trim( $value );
}
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch, CURLOPT_HEADERFUNCTION,
function ( $ch, $header ) use ( &$req ) {
$length = strlen( $header );
$matches = [];
if ( preg_match( "/^(HTTP\/1\.[01]) (\d{3}) (.*)/", $header, $matches ) ) {
$req['response']['code'] = (int)$matches[2];
$req['response']['reason'] = trim( $matches[3] );
return $length;
}
if ( strpos( $header, ":" ) === false ) {
return $length;
}
list( $name, $value ) = explode( ":", $header, 2 );
$req['response']['headers'][strtolower( $name )] = trim( $value );
return $length;
}
);
if ( isset( $req['stream'] ) ) {
// Don't just use CURLOPT_FILE as that might give:
// curl_setopt(): cannot represent a stream of type Output as a STDIO FILE*
// The callback here handles both normal files and php://temp handles.
curl_setopt( $ch, CURLOPT_WRITEFUNCTION,
function ( $ch, $data ) use ( &$req ) {
return fwrite( $req['stream'], $data );
}
);
} else {
curl_setopt( $ch, CURLOPT_WRITEFUNCTION,
function ( $ch, $data ) use ( &$req ) {
$req['response']['body'] .= $data;
return strlen( $data );
}
);
}
return $ch;
}
/**
* @return resource
*/
protected function getCurlMulti() {
if ( !$this->multiHandle ) {
$cmh = curl_multi_init();
if ( function_exists( 'curl_multi_setopt' ) ) { // PHP 5.5
curl_multi_setopt( $cmh, CURLMOPT_PIPELINING, (int)$this->usePipelining );
curl_multi_setopt( $cmh, CURLMOPT_MAXCONNECTS, (int)$this->maxConnsPerHost );
}
$this->multiHandle = $cmh;
}
return $this->multiHandle;
}
function __destruct() {
if ( $this->multiHandle ) {
curl_multi_close( $this->multiHandle );
}
}
}