晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php
namespace GuzzleHttp;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Promise\RejectedPromise;
use GuzzleHttp\Psr7;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* Middleware that retries requests based on the boolean result of
* invoking the provided "decider" function.
*/
class RetryMiddleware
{
/** @var callable */
private $nextHandler;
/** @var callable */
private $decider;
/**
* @param callable $decider Function that accepts the number of retries,
* a request, [response], and [exception] and
* returns true if the request is to be
* retried.
* @param callable $nextHandler Next handler to invoke.
* @param callable $delay Function that accepts the number of retries
* and [response] and returns the number of
* milliseconds to delay.
*/
public function __construct(
callable $decider,
callable $nextHandler,
callable $delay = null
) {
$this->decider = $decider;
$this->nextHandler = $nextHandler;
$this->delay = $delay ?: __CLASS__ . '::exponentialDelay';
}
/**
* Default exponential backoff delay function.
*
* @param $retries
*
* @return int
*/
public static function exponentialDelay($retries)
{
return (int) pow(2, $retries - 1);
}
/**
* @param RequestInterface $request
* @param array $options
*
* @return PromiseInterface
*/
public function __invoke(RequestInterface $request, array $options)
{
if (!isset($options['retries'])) {
$options['retries'] = 0;
}
$fn = $this->nextHandler;
return $fn($request, $options)
->then(
$this->onFulfilled($request, $options),
$this->onRejected($request, $options)
);
}
private function onFulfilled(RequestInterface $req, array $options)
{
return function ($value) use ($req, $options) {
if (!call_user_func(
$this->decider,
$options['retries'],
$req,
$value,
null
)) {
return $value;
}
return $this->doRetry($req, $options, $value);
};
}
private function onRejected(RequestInterface $req, array $options)
{
return function ($reason) use ($req, $options) {
if (!call_user_func(
$this->decider,
$options['retries'],
$req,
null,
$reason
)) {
return \GuzzleHttp\Promise\rejection_for($reason);
}
return $this->doRetry($req, $options);
};
}
private function doRetry(RequestInterface $request, array $options, ResponseInterface $response = null)
{
$options['delay'] = call_user_func($this->delay, ++$options['retries'], $response);
return $this($request, $options);
}
}