<?php
namespace GuzzleHttp\Handler;

use GuzzleHttp\RequestOptions;
use Psr\Http\Message\RequestInterface;

/**
* Provides basic proxies for handlers.
*/
class Proxy
{
/**
* Sends synchronous requests to a specific handler while sending all other
* requests to another handler.
*
* @param callable $default Handler used for normal responses
* @param callable $sync Handler used for synchronous responses.
*
* @return callable Returns the composed handler.
*/
public static function wrapSync(
callable $default,
callable $sync
) {
return function (RequestInterface $request, array $options) use ($default, $sync) {
return empty($options[RequestOptions::SYNCHRONOUS])
? $default($request, $options)
: $sync($request, $options);
};
}

/**
* Sends streaming requests to a streaming compatible handler while sending
* all other requests to a default handler.
*
* This, for example, could be useful for taking advantage of the
* performance benefits of curl while still supporting true streaming
* through the StreamHandler.
*
* @param callable $default Handler used for non-streaming responses
* @param callable $streaming Handler used for streaming responses
*
* @return callable Returns the composed handler.
*/
public static function wrapStreaming(
callable $default,
callable $streaming
) {
return function (RequestInterface $request, array $options) use ($default, $streaming) {
return empty($options['stream'])
? $default($request, $options)
: $streaming($request, $options);
};
}
}