includes/libs/MultiHttpClient.php

   1 <?php
   2 /**
   3  * HTTP service client
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class to handle concurrent HTTP requests
  25  *
  26  * HTTP request maps are arrays that use the following format:
  27  *   - method   : GET/HEAD/PUT/POST/DELETE
  28  *   - url      : HTTP/HTTPS URL
  29  *   - query    : <query parameter field/value associative array> (uses RFC 3986)
  30  *   - headers  : <header name/value associative array>
  31  *   - body     : source to get the HTTP request body from;
  32  *                this can simply be a string (always), a resource for
  33  *                PUT requests, and a field/value array for POST request;
  34  *                array bodies are encoded as multipart/form-data and strings
  35  *                use application/x-www-form-urlencoded (headers sent automatically)
  36  *   - stream   : resource to stream the HTTP response body to
  37  *   - proxy    : HTTP proxy to use
  38  *   - flags    : map of boolean flags which supports:
  39  *                  - relayResponseHeaders : write out header via header()
  40  * Request maps can use integer index 0 instead of 'method' and 1 instead of 'url'.
  41  *
  42  * @author Aaron Schulz
  43  * @since 1.23
  44  */
  45 class MultiHttpClient {
  46         /** @var resource */
  47         protected $multiHandle = null; // curl_multi handle
  48         /** @var string|null SSL certificates path  */
  49         protected $caBundlePath;
  50         /** @var integer */
  51         protected $connTimeout = 10;
  52         /** @var integer */
  53         protected $reqTimeout = 300;
  54         /** @var bool */
  55         protected $usePipelining = false;
  56         /** @var integer */
  57         protected $maxConnsPerHost = 50;
  58         /** @var string|null proxy */
  59         protected $proxy;
  60         /** @var string */
  61         protected $userAgent = 'wikimedia/multi-http-client v1.0';
  62
  63         /**
  64          * @param array $options
  65          *   - connTimeout     : default connection timeout (seconds)
  66          *   - reqTimeout      : default request timeout (seconds)
  67          *   - proxy           : HTTP proxy to use
  68          *   - usePipelining   : whether to use HTTP pipelining if possible (for all hosts)
  69          *   - maxConnsPerHost : maximum number of concurrent connections (per host)
  70          *   - userAgent       : The User-Agent header value to send
  71          * @throws Exception
  72          */
  73         public function __construct( array $options ) {
  74                 if ( isset( $options['caBundlePath'] ) ) {
  75                         $this->caBundlePath = $options['caBundlePath'];
  76                         if ( !file_exists( $this->caBundlePath ) ) {
  77                                 throw new Exception( "Cannot find CA bundle: " . $this->caBundlePath );
  78                         }
  79                 }
  80                 static $opts = [
  81                         'connTimeout', 'reqTimeout', 'usePipelining', 'maxConnsPerHost', 'proxy', 'userAgent'
  82                 ];
  83                 foreach ( $opts as $key ) {
  84                         if ( isset( $options[$key] ) ) {
  85                                 $this->$key = $options[$key];
  86                         }
  87                 }
  88         }
  89
  90         /**
  91          * Execute an HTTP(S) request
  92          *
  93          * This method returns a response map of:
  94          *   - code    : HTTP response code or 0 if there was a serious cURL error
  95          *   - reason  : HTTP response reason (empty if there was a serious cURL error)
  96          *   - headers : <header name/value associative array>
  97          *   - body    : HTTP response body or resource (if "stream" was set)
  98          *   - error     : Any cURL error string
  99          * The map also stores integer-indexed copies of these values. This lets callers do:
 100          * @code
 101          *              list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $http->run( $req );
 102          * @endcode
 103          * @param array $req HTTP request array
 104          * @param array $opts
 105          *   - connTimeout    : connection timeout per request (seconds)
 106          *   - reqTimeout     : post-connection timeout per request (seconds)
 107          * @return array Response array for request
 108          */
 109         public function run( array $req, array $opts = [] ) {
 110                 return $this->runMulti( [ $req ], $opts )[0]['response'];
 111         }
 112
 113         /**
 114          * Execute a set of HTTP(S) requests concurrently
 115          *
 116          * The maps are returned by this method with the 'response' field set to a map of:
 117          *   - code    : HTTP response code or 0 if there was a serious cURL error
 118          *   - reason  : HTTP response reason (empty if there was a serious cURL error)
 119          *   - headers : <header name/value associative array>
 120          *   - body    : HTTP response body or resource (if "stream" was set)
 121          *   - error   : Any cURL error string
 122          * The map also stores integer-indexed copies of these values. This lets callers do:
 123          * @code
 124          *        list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $req['response'];
 125          * @endcode
 126          * All headers in the 'headers' field are normalized to use lower case names.
 127          * This is true for the request headers and the response headers. Integer-indexed
 128          * method/URL entries will also be changed to use the corresponding string keys.
 129          *
 130          * @param array $reqs Map of HTTP request arrays
 131          * @param array $opts
 132          *   - connTimeout     : connection timeout per request (seconds)
 133          *   - reqTimeout      : post-connection timeout per request (seconds)
 134          *   - usePipelining   : whether to use HTTP pipelining if possible
 135          *   - maxConnsPerHost : maximum number of concurrent connections (per host)
 136          * @return array $reqs With response array populated for each
 137          * @throws Exception
 138          */
 139         public function runMulti( array $reqs, array $opts = [] ) {
 140                 $chm = $this->getCurlMulti();
 141
 142                 // Normalize $reqs and add all of the required cURL handles...
 143                 $handles = [];
 144                 foreach ( $reqs as $index => &$req ) {
 145                         $req['response'] = [
 146                                 'code'     => 0,
 147                                 'reason'   => '',
 148                                 'headers'  => [],
 149                                 'body'     => '',
 150                                 'error'    => ''
 151                         ];
 152                         if ( isset( $req[0] ) ) {
 153                                 $req['method'] = $req[0]; // short-form
 154                                 unset( $req[0] );
 155                         }
 156                         if ( isset( $req[1] ) ) {
 157                                 $req['url'] = $req[1]; // short-form
 158                                 unset( $req[1] );
 159                         }
 160                         if ( !isset( $req['method'] ) ) {
 161                                 throw new Exception( "Request has no 'method' field set." );
 162                         } elseif ( !isset( $req['url'] ) ) {
 163                                 throw new Exception( "Request has no 'url' field set." );
 164                         }
 165                         $req['query'] = isset( $req['query'] ) ? $req['query'] : [];
 166                         $headers = []; // normalized headers
 167                         if ( isset( $req['headers'] ) ) {
 168                                 foreach ( $req['headers'] as $name => $value ) {
 169                                         $headers[strtolower( $name )] = $value;
 170                                 }
 171                         }
 172                         $req['headers'] = $headers;
 173                         if ( !isset( $req['body'] ) ) {
 174                                 $req['body'] = '';
 175                                 $req['headers']['content-length'] = 0;
 176                         }
 177                         $req['flags'] = isset( $req['flags'] ) ? $req['flags'] : [];
 178                         $handles[$index] = $this->getCurlHandle( $req, $opts );
 179                         if ( count( $reqs ) > 1 ) {
 180                                 // https://github.com/guzzle/guzzle/issues/349
 181                                 curl_setopt( $handles[$index], CURLOPT_FORBID_REUSE, true );
 182                         }
 183                 }
 184                 unset( $req ); // don't assign over this by accident
 185
 186                 $indexes = array_keys( $reqs );
 187                 if ( isset( $opts['usePipelining'] ) ) {
 188                         curl_multi_setopt( $chm, CURLMOPT_PIPELINING, (int)$opts['usePipelining'] );
 189                 }
 190                 if ( isset( $opts['maxConnsPerHost'] ) ) {
 191                         // Keep these sockets around as they may be needed later in the request
 192                         curl_multi_setopt( $chm, CURLMOPT_MAXCONNECTS, (int)$opts['maxConnsPerHost'] );
 193                 }
 194
 195                 // @TODO: use a per-host rolling handle window (e.g. CURLMOPT_MAX_HOST_CONNECTIONS)
 196                 $batches = array_chunk( $indexes, $this->maxConnsPerHost );
 197                 $infos = [];
 198
 199                 foreach ( $batches as $batch ) {
 200                         // Attach all cURL handles for this batch
 201                         foreach ( $batch as $index ) {
 202                                 curl_multi_add_handle( $chm, $handles[$index] );
 203                         }
 204                         // Execute the cURL handles concurrently...
 205                         $active = null; // handles still being processed
 206                         do {
 207                                 // Do any available work...
 208                                 do {
 209                                         $mrc = curl_multi_exec( $chm, $active );
 210                                         $info = curl_multi_info_read( $chm );
 211                                         if ( $info !== false ) {
 212                                                 $infos[(int)$info['handle']] = $info;
 213                                         }
 214                                 } while ( $mrc == CURLM_CALL_MULTI_PERFORM );
 215                                 // Wait (if possible) for available work...
 216                                 if ( $active > 0 && $mrc == CURLM_OK ) {
 217                                         if ( curl_multi_select( $chm, 10 ) == -1 ) {
 218                                                 // PHP bug 63411; http://curl.haxx.se/libcurl/c/curl_multi_fdset.html
 219                                                 usleep( 5000 ); // 5ms
 220                                         }
 221                                 }
 222                         } while ( $active > 0 && $mrc == CURLM_OK );
 223                 }
 224
 225                 // Remove all of the added cURL handles and check for errors...
 226                 foreach ( $reqs as $index => &$req ) {
 227                         $ch = $handles[$index];
 228                         curl_multi_remove_handle( $chm, $ch );
 229
 230                         if ( isset( $infos[(int)$ch] ) ) {
 231                                 $info = $infos[(int)$ch];
 232                                 $errno = $info['result'];
 233                                 if ( $errno !== 0 ) {
 234                                         $req['response']['error'] = "(curl error: $errno)";
 235                                         if ( function_exists( 'curl_strerror' ) ) {
 236                                                 $req['response']['error'] .= " " . curl_strerror( $errno );
 237                                         }
 238                                 }
 239                         } else {
 240                                 $req['response']['error'] = "(curl error: no status set)";
 241                         }
 242
 243                         // For convenience with the list() operator
 244                         $req['response'][0] = $req['response']['code'];
 245                         $req['response'][1] = $req['response']['reason'];
 246                         $req['response'][2] = $req['response']['headers'];
 247                         $req['response'][3] = $req['response']['body'];
 248                         $req['response'][4] = $req['response']['error'];
 249                         curl_close( $ch );
 250                         // Close any string wrapper file handles
 251                         if ( isset( $req['_closeHandle'] ) ) {
 252                                 fclose( $req['_closeHandle'] );
 253                                 unset( $req['_closeHandle'] );
 254                         }
 255                 }
 256                 unset( $req ); // don't assign over this by accident
 257
 258                 // Restore the default settings
 259                 curl_multi_setopt( $chm, CURLMOPT_PIPELINING, (int)$this->usePipelining );
 260                 curl_multi_setopt( $chm, CURLMOPT_MAXCONNECTS, (int)$this->maxConnsPerHost );
 261
 262                 return $reqs;
 263         }
 264
 265         /**
 266          * @param array $req HTTP request map
 267          * @param array $opts
 268          *   - connTimeout    : default connection timeout
 269          *   - reqTimeout     : default request timeout
 270          * @return resource
 271          * @throws Exception
 272          */
 273         protected function getCurlHandle( array &$req, array $opts = [] ) {
 274                 $ch = curl_init();
 275
 276                 curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT,
 277                         isset( $opts['connTimeout'] ) ? $opts['connTimeout'] : $this->connTimeout );
 278                 curl_setopt( $ch, CURLOPT_PROXY, isset( $req['proxy'] ) ? $req['proxy'] : $this->proxy );
 279                 curl_setopt( $ch, CURLOPT_TIMEOUT,
 280                         isset( $opts['reqTimeout'] ) ? $opts['reqTimeout'] : $this->reqTimeout );
 281                 curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1 );
 282                 curl_setopt( $ch, CURLOPT_MAXREDIRS, 4 );
 283                 curl_setopt( $ch, CURLOPT_HEADER, 0 );
 284                 if ( !is_null( $this->caBundlePath ) ) {
 285                         curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, true );
 286                         curl_setopt( $ch, CURLOPT_CAINFO, $this->caBundlePath );
 287                 }
 288                 curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
 289
 290                 $url = $req['url'];
 291                 $query = http_build_query( $req['query'], '', '&', PHP_QUERY_RFC3986 );
 292                 if ( $query != '' ) {
 293                         $url .= strpos( $req['url'], '?' ) === false ? "?$query" : "&$query";
 294                 }
 295                 curl_setopt( $ch, CURLOPT_URL, $url );
 296
 297                 curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, $req['method'] );
 298                 if ( $req['method'] === 'HEAD' ) {
 299                         curl_setopt( $ch, CURLOPT_NOBODY, 1 );
 300                 }
 301
 302                 if ( $req['method'] === 'PUT' ) {
 303                         curl_setopt( $ch, CURLOPT_PUT, 1 );
 304                         if ( is_resource( $req['body'] ) ) {
 305                                 curl_setopt( $ch, CURLOPT_INFILE, $req['body'] );
 306                                 if ( isset( $req['headers']['content-length'] ) ) {
 307                                         curl_setopt( $ch, CURLOPT_INFILESIZE, $req['headers']['content-length'] );
 308                                 } elseif ( isset( $req['headers']['transfer-encoding'] ) &&
 309                                         $req['headers']['transfer-encoding'] === 'chunks'
 310                                 ) {
 311                                         curl_setopt( $ch, CURLOPT_UPLOAD, true );
 312                                 } else {
 313                                         throw new Exception( "Missing 'Content-Length' or 'Transfer-Encoding' header." );
 314                                 }
 315                         } elseif ( $req['body'] !== '' ) {
 316                                 $fp = fopen( "php://temp", "wb+" );
 317                                 fwrite( $fp, $req['body'], strlen( $req['body'] ) );
 318                                 rewind( $fp );
 319                                 curl_setopt( $ch, CURLOPT_INFILE, $fp );
 320                                 curl_setopt( $ch, CURLOPT_INFILESIZE, strlen( $req['body'] ) );
 321                                 $req['_closeHandle'] = $fp; // remember to close this later
 322                         } else {
 323                                 curl_setopt( $ch, CURLOPT_INFILESIZE, 0 );
 324                         }
 325                         curl_setopt( $ch, CURLOPT_READFUNCTION,
 326                                 function ( $ch, $fd, $length ) {
 327                                         $data = fread( $fd, $length );
 328                                         $len = strlen( $data );
 329                                         return $data;
 330                                 }
 331                         );
 332                 } elseif ( $req['method'] === 'POST' ) {
 333                         curl_setopt( $ch, CURLOPT_POST, 1 );
 334                         // Don't interpret POST parameters starting with '@' as file uploads, because this
 335                         // makes it impossible to POST plain values starting with '@' (and causes security
 336                         // issues potentially exposing the contents of local files).
 337                         // The PHP manual says this option was introduced in PHP 5.5 defaults to true in PHP 5.6,
 338                         // but we support lower versions, and the option doesn't exist in HHVM 5.6.99.
 339                         if ( defined( 'CURLOPT_SAFE_UPLOAD' ) ) {
 340                                 curl_setopt( $ch, CURLOPT_SAFE_UPLOAD, true );
 341                         } elseif ( is_array( $req['body'] ) ) {
 342                                 // In PHP 5.2 and later, '@' is interpreted as a file upload if POSTFIELDS
 343                                 // is an array, but not if it's a string. So convert $req['body'] to a string
 344                                 // for safety.
 345                                 $req['body'] = http_build_query( $req['body'] );
 346                         }
 347                         curl_setopt( $ch, CURLOPT_POSTFIELDS, $req['body'] );
 348                 } else {
 349                         if ( is_resource( $req['body'] ) || $req['body'] !== '' ) {
 350                                 throw new Exception( "HTTP body specified for a non PUT/POST request." );
 351                         }
 352                         $req['headers']['content-length'] = 0;
 353                 }
 354
 355                 if ( !isset( $req['headers']['user-agent'] ) ) {
 356                         $req['headers']['user-agent'] = $this->userAgent;
 357                 }
 358
 359                 $headers = [];
 360                 foreach ( $req['headers'] as $name => $value ) {
 361                         if ( strpos( $name, ': ' ) ) {
 362                                 throw new Exception( "Headers cannot have ':' in the name." );
 363                         }
 364                         $headers[] = $name . ': ' . trim( $value );
 365                 }
 366                 curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
 367
 368                 curl_setopt( $ch, CURLOPT_HEADERFUNCTION,
 369                         function ( $ch, $header ) use ( &$req ) {
 370                                 if ( !empty( $req['flags']['relayResponseHeaders'] ) ) {
 371                                         header( $header );
 372                                 }
 373                                 $length = strlen( $header );
 374                                 $matches = [];
 375                                 if ( preg_match( "/^(HTTP\/1\.[01]) (\d{3}) (.*)/", $header, $matches ) ) {
 376                                         $req['response']['code'] = (int)$matches[2];
 377                                         $req['response']['reason'] = trim( $matches[3] );
 378                                         return $length;
 379                                 }
 380                                 if ( strpos( $header, ":" ) === false ) {
 381                                         return $length;
 382                                 }
 383                                 list( $name, $value ) = explode( ":", $header, 2 );
 384                                 $req['response']['headers'][strtolower( $name )] = trim( $value );
 385                                 return $length;
 386                         }
 387                 );
 388
 389                 if ( isset( $req['stream'] ) ) {
 390                         // Don't just use CURLOPT_FILE as that might give:
 391                         // curl_setopt(): cannot represent a stream of type Output as a STDIO FILE*
 392                         // The callback here handles both normal files and php://temp handles.
 393                         curl_setopt( $ch, CURLOPT_WRITEFUNCTION,
 394                                 function ( $ch, $data ) use ( &$req ) {
 395                                         return fwrite( $req['stream'], $data );
 396                                 }
 397                         );
 398                 } else {
 399                         curl_setopt( $ch, CURLOPT_WRITEFUNCTION,
 400                                 function ( $ch, $data ) use ( &$req ) {
 401                                         $req['response']['body'] .= $data;
 402                                         return strlen( $data );
 403                                 }
 404                         );
 405                 }
 406
 407                 return $ch;
 408         }
 409
 410         /**
 411          * @return resource
 412          */
 413         protected function getCurlMulti() {
 414                 if ( !$this->multiHandle ) {
 415                         $cmh = curl_multi_init();
 416                         curl_multi_setopt( $cmh, CURLMOPT_PIPELINING, (int)$this->usePipelining );
 417                         curl_multi_setopt( $cmh, CURLMOPT_MAXCONNECTS, (int)$this->maxConnsPerHost );
 418                         $this->multiHandle = $cmh;
 419                 }
 420                 return $this->multiHandle;
 421         }
 422
 423         function __destruct() {
 424                 if ( $this->multiHandle ) {
 425                         curl_multi_close( $this->multiHandle );
 426                 }
 427         }
 428 }