[wp-trac] [WordPress Trac] #33055: Support Parallel HTTP Requests in WP_Http, et al

[WordPress Trac]

#33055: Support Parallel HTTP Requests in WP_Http, et al
----------------------------+-------------------------------------
 Reporter:  wonderboymusic  |      Owner:
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  Future Release
Component:  HTTP API        |    Version:
 Severity:  normal          |   Keywords:  has-patch needs-refresh
  Focuses:                  |
----------------------------+-------------------------------------
 HTTP-driven applications need to be performant. Being able to make
 multiple HTTP requests asynchronously is vital to making this a reality.
 Currently, WordPress only allows us to make one request at a time,
 serially:

 {{{
 $req1 = wp_remote_get( 'http://failwhale.com/posts', [ 'timeout' => 2 ] );
 $req2 = wp_remote_get( 'http://failwhale.com/burritos', [ 'timeout' => 2 ]
 );
 }}}

 Wouldn't it be cool if we could do:

 {{{
 $responses = wp_remote_get( [
     [ 'http://api.bandsintown.com/artists/Ed%20Sheeran.json?app_id=woo', [
 'timeout' => 2 ] ],
     [ 'http://api.bandsintown.com/artists/Taylor%20Swift.json?app_id=woo',
 [ 'timeout' => 2 ] ]
 ] );
 }}}

 My patch does this by doing the following:

 * Introduces `WP_Http_Request`
 * If an array is passed to `WP_Http::request()`, automatically calls
 `WP_Http::request_multi()`
 * When multiple requests are made, hashes the request to the maintain a
 reference generated by `WP_Http::hash_request()`
 * Adds `WP_Http::_get_first_available_multi_transport()` to initially
 support cURL only, we could also add support for PECL HTTP and
 `HttpRequestPool`
 * If an array of data is passed to `WP_Http::_dispatch_request()`, calls
 `->request_multi()` instead of `->request()` on the approved multi
 transport
 * In `WP_Http_Curl`, does kung fu and jiu jitsu at the same time to
 dynamically support streaming of multiple requests simultaneously via
 `->__call()`
 * Implements cURL Multi

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Ticket URL: <https://core.trac.wordpress.org/ticket/33055>
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