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<pre class="code"><code><span id="1" class="l"><span class="xlang"><?php</span>
</span><span id="2" class="l"><span class="php-keyword1">namespace</span> GuzzleHttp;
</span><span id="3" class="l">
</span><span id="4" class="l"><span class="php-keyword1">use</span> GuzzleHttp\Promise\PromiseInterface;
</span><span id="5" class="l"><span class="php-keyword1">use</span> GuzzleHttp\Promise\RejectedPromise;
</span><span id="6" class="l"><span class="php-keyword1">use</span> GuzzleHttp\Psr7;
</span><span id="7" class="l"><span class="php-keyword1">use</span> Psr\Http\Message\RequestInterface;
</span><span id="8" class="l"><span class="php-keyword1">use</span> Psr\Http\Message\ResponseInterface;
</span><span id="9" class="l">
</span><span id="10" class="l"><span class="php-comment">/**
</span></span><span id="11" class="l"><span class="php-comment"> * Middleware that retries requests based on the boolean result of
</span></span><span id="12" class="l"><span class="php-comment"> * invoking the provided "decider" function.
</span></span><span id="13" class="l"><span class="php-comment"> */</span>
</span><span id="14" class="l"><span class="php-keyword1">class</span> RetryMiddleware
</span><span id="15" class="l">{
</span><span id="16" class="l"> <span class="php-comment">/** @var callable */</span>
</span><span id="17" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$nextHandler</span>;
</span><span id="18" class="l">
</span><span id="19" class="l"> <span class="php-comment">/** @var callable */</span>
</span><span id="20" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$decider</span>;
</span><span id="21" class="l">
</span><span id="22" class="l"> <span class="php-comment">/**
</span></span><span id="23" class="l"><span class="php-comment"> * @param callable $decider Function that accepts the number of retries,
</span></span><span id="24" class="l"><span class="php-comment"> * a request, [response], and [exception] and
</span></span><span id="25" class="l"><span class="php-comment"> * returns true if the request is to be
</span></span><span id="26" class="l"><span class="php-comment"> * retried.
</span></span><span id="27" class="l"><span class="php-comment"> * @param callable $nextHandler Next handler to invoke.
</span></span><span id="28" class="l"><span class="php-comment"> * @param callable $delay Function that accepts the number of retries
</span></span><span id="29" class="l"><span class="php-comment"> * and [response] and returns the number of
</span></span><span id="30" class="l"><span class="php-comment"> * milliseconds to delay.
</span></span><span id="31" class="l"><span class="php-comment"> */</span>
</span><span id="32" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __construct(
</span><span id="33" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$decider</span>,
</span><span id="34" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$nextHandler</span>,
</span><span id="35" class="l"> <span class="php-keyword1">callable</span> <span class="php-var">$delay</span> = <span class="php-keyword1">null</span>
</span><span id="36" class="l"> ) {
</span><span id="37" class="l"> <span class="php-var">$this</span>->decider = <span class="php-var">$decider</span>;
</span><span id="38" class="l"> <span class="php-var">$this</span>->nextHandler = <span class="php-var">$nextHandler</span>;
</span><span id="39" class="l"> <span class="php-var">$this</span>->delay = <span class="php-var">$delay</span> ?: __CLASS__ . <span class="php-quote">'::exponentialDelay'</span>;
</span><span id="40" class="l"> }
</span><span id="41" class="l">
</span><span id="42" class="l"> <span class="php-comment">/**
</span></span><span id="43" class="l"><span class="php-comment"> * Default exponential backoff delay function.
</span></span><span id="44" class="l"><span class="php-comment"> *
</span></span><span id="45" class="l"><span class="php-comment"> * @param $retries
</span></span><span id="46" class="l"><span class="php-comment"> *
</span></span><span id="47" class="l"><span class="php-comment"> * @return int
</span></span><span id="48" class="l"><span class="php-comment"> */</span>
</span><span id="49" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">static</span> <span class="php-keyword1">function</span> exponentialDelay(<span class="php-var">$retries</span>)
</span><span id="50" class="l"> {
</span><span id="51" class="l"> <span class="php-keyword1">return</span> (int) <span class="php-keyword2">pow</span>(<span class="php-num">2</span>, <span class="php-var">$retries</span> - <span class="php-num">1</span>);
</span><span id="52" class="l"> }
</span><span id="53" class="l">
</span><span id="54" class="l"> <span class="php-comment">/**
</span></span><span id="55" class="l"><span class="php-comment"> * @param RequestInterface $request
</span></span><span id="56" class="l"><span class="php-comment"> * @param array $options
</span></span><span id="57" class="l"><span class="php-comment"> *
</span></span><span id="58" class="l"><span class="php-comment"> * @return PromiseInterface
</span></span><span id="59" class="l"><span class="php-comment"> */</span>
</span><span id="60" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __invoke(RequestInterface <span class="php-var">$request</span>, <span class="php-keyword1">array</span> <span class="php-var">$options</span>)
</span><span id="61" class="l"> {
</span><span id="62" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword1">isset</span>(<span class="php-var">$options</span>[<span class="php-quote">'retries'</span>])) {
</span><span id="63" class="l"> <span class="php-var">$options</span>[<span class="php-quote">'retries'</span>] = <span class="php-num">0</span>;
</span><span id="64" class="l"> }
</span><span id="65" class="l">
</span><span id="66" class="l"> <span class="php-var">$fn</span> = <span class="php-var">$this</span>->nextHandler;
</span><span id="67" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$fn</span>(<span class="php-var">$request</span>, <span class="php-var">$options</span>)
</span><span id="68" class="l"> ->then(
</span><span id="69" class="l"> <span class="php-var">$this</span>->onFulfilled(<span class="php-var">$request</span>, <span class="php-var">$options</span>),
</span><span id="70" class="l"> <span class="php-var">$this</span>->onRejected(<span class="php-var">$request</span>, <span class="php-var">$options</span>)
</span><span id="71" class="l"> );
</span><span id="72" class="l"> }
</span><span id="73" class="l">
</span><span id="74" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> onFulfilled(RequestInterface <span class="php-var">$req</span>, <span class="php-keyword1">array</span> <span class="php-var">$options</span>)
</span><span id="75" class="l"> {
</span><span id="76" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">function</span> (<span class="php-var">$value</span>) <span class="php-keyword1">use</span> (<span class="php-var">$req</span>, <span class="php-var">$options</span>) {
</span><span id="77" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">call_user_func</span>(
</span><span id="78" class="l"> <span class="php-var">$this</span>->decider,
</span><span id="79" class="l"> <span class="php-var">$options</span>[<span class="php-quote">'retries'</span>],
</span><span id="80" class="l"> <span class="php-var">$req</span>,
</span><span id="81" class="l"> <span class="php-var">$value</span>,
</span><span id="82" class="l"> <span class="php-keyword1">null</span>
</span><span id="83" class="l"> )) {
</span><span id="84" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$value</span>;
</span><span id="85" class="l"> }
</span><span id="86" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->doRetry(<span class="php-var">$req</span>, <span class="php-var">$options</span>, <span class="php-var">$value</span>);
</span><span id="87" class="l"> };
</span><span id="88" class="l"> }
</span><span id="89" class="l">
</span><span id="90" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> onRejected(RequestInterface <span class="php-var">$req</span>, <span class="php-keyword1">array</span> <span class="php-var">$options</span>)
</span><span id="91" class="l"> {
</span><span id="92" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">function</span> (<span class="php-var">$reason</span>) <span class="php-keyword1">use</span> (<span class="php-var">$req</span>, <span class="php-var">$options</span>) {
</span><span id="93" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">call_user_func</span>(
</span><span id="94" class="l"> <span class="php-var">$this</span>->decider,
</span><span id="95" class="l"> <span class="php-var">$options</span>[<span class="php-quote">'retries'</span>],
</span><span id="96" class="l"> <span class="php-var">$req</span>,
</span><span id="97" class="l"> <span class="php-keyword1">null</span>,
</span><span id="98" class="l"> <span class="php-var">$reason</span>
</span><span id="99" class="l"> )) {
</span><span id="100" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">new</span> RejectedPromise(<span class="php-var">$reason</span>);
</span><span id="101" class="l"> }
</span><span id="102" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->doRetry(<span class="php-var">$req</span>, <span class="php-var">$options</span>);
</span><span id="103" class="l"> };
</span><span id="104" class="l"> }
</span><span id="105" class="l">
</span><span id="106" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> doRetry(RequestInterface <span class="php-var">$request</span>, <span class="php-keyword1">array</span> <span class="php-var">$options</span>, ResponseInterface <span class="php-var">$response</span> = <span class="php-keyword1">null</span>)
</span><span id="107" class="l"> {
</span><span id="108" class="l"> <span class="php-var">$options</span>[<span class="php-quote">'delay'</span>] = <span class="php-keyword2">call_user_func</span>(<span class="php-var">$this</span>->delay, ++<span class="php-var">$options</span>[<span class="php-quote">'retries'</span>], <span class="php-var">$response</span>);
</span><span id="109" class="l">
</span><span id="110" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>(<span class="php-var">$request</span>, <span class="php-var">$options</span>);
</span><span id="111" class="l"> }
</span><span id="112" class="l">}
</span><span id="113" class="l"></span></code></pre>
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