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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\Promise;
</span><span id="3" class="l">
</span><span id="4" class="l"><span class="php-comment">/**
</span></span><span id="5" class="l"><span class="php-comment"> * Represents a promise that iterates over many promises and invokes
</span></span><span id="6" class="l"><span class="php-comment"> * side-effect functions in the process.
</span></span><span id="7" class="l"><span class="php-comment"> */</span>
</span><span id="8" class="l"><span class="php-keyword1">class</span> EachPromise <span class="php-keyword1">implements</span> PromisorInterface
</span><span id="9" class="l">{
</span><span id="10" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$pending</span> = [];
</span><span id="11" class="l">
</span><span id="12" class="l"> <span class="php-comment">/** @var \Iterator */</span>
</span><span id="13" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$iterable</span>;
</span><span id="14" class="l">
</span><span id="15" class="l"> <span class="php-comment">/** @var callable|int */</span>
</span><span id="16" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$concurrency</span>;
</span><span id="17" class="l">
</span><span id="18" class="l"> <span class="php-comment">/** @var callable */</span>
</span><span id="19" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$onFulfilled</span>;
</span><span id="20" class="l">
</span><span id="21" class="l"> <span class="php-comment">/** @var callable */</span>
</span><span id="22" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$onRejected</span>;
</span><span id="23" class="l">
</span><span id="24" class="l"> <span class="php-comment">/** @var Promise */</span>
</span><span id="25" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$aggregate</span>;
</span><span id="26" class="l">
</span><span id="27" class="l"> <span class="php-comment">/** @var bool */</span>
</span><span id="28" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$mutex</span>;
</span><span id="29" class="l">
</span><span id="30" class="l"> <span class="php-comment">/**
</span></span><span id="31" class="l"><span class="php-comment"> * Configuration hash can include the following key value pairs:
</span></span><span id="32" class="l"><span class="php-comment"> *
</span></span><span id="33" class="l"><span class="php-comment"> * - fulfilled: (callable) Invoked when a promise fulfills. The function
</span></span><span id="34" class="l"><span class="php-comment"> * is invoked with three arguments: the fulfillment value, the index
</span></span><span id="35" class="l"><span class="php-comment"> * position from the iterable list of the promise, and the aggregate
</span></span><span id="36" class="l"><span class="php-comment"> * promise that manages all of the promises. The aggregate promise may
</span></span><span id="37" class="l"><span class="php-comment"> * be resolved from within the callback to short-circuit the promise.
</span></span><span id="38" class="l"><span class="php-comment"> * - rejected: (callable) Invoked when a promise is rejected. The
</span></span><span id="39" class="l"><span class="php-comment"> * function is invoked with three arguments: the rejection reason, the
</span></span><span id="40" class="l"><span class="php-comment"> * index position from the iterable list of the promise, and the
</span></span><span id="41" class="l"><span class="php-comment"> * aggregate promise that manages all of the promises. The aggregate
</span></span><span id="42" class="l"><span class="php-comment"> * promise may be resolved from within the callback to short-circuit
</span></span><span id="43" class="l"><span class="php-comment"> * the promise.
</span></span><span id="44" class="l"><span class="php-comment"> * - concurrency: (integer) Pass this configuration option to limit the
</span></span><span id="45" class="l"><span class="php-comment"> * allowed number of outstanding concurrently executing promises,
</span></span><span id="46" class="l"><span class="php-comment"> * creating a capped pool of promises. There is no limit by default.
</span></span><span id="47" class="l"><span class="php-comment"> *
</span></span><span id="48" class="l"><span class="php-comment"> * @param mixed $iterable Promises or values to iterate.
</span></span><span id="49" class="l"><span class="php-comment"> * @param array $config Configuration options
</span></span><span id="50" class="l"><span class="php-comment"> */</span>
</span><span id="51" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __construct(<span class="php-var">$iterable</span>, <span class="php-keyword1">array</span> <span class="php-var">$config</span> = [])
</span><span id="52" class="l"> {
</span><span id="53" class="l"> <span class="php-var">$this</span>->iterable = iter_for(<span class="php-var">$iterable</span>);
</span><span id="54" class="l">
</span><span id="55" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">isset</span>(<span class="php-var">$config</span>[<span class="php-quote">'concurrency'</span>])) {
</span><span id="56" class="l"> <span class="php-var">$this</span>->concurrency = <span class="php-var">$config</span>[<span class="php-quote">'concurrency'</span>];
</span><span id="57" class="l"> }
</span><span id="58" class="l">
</span><span id="59" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">isset</span>(<span class="php-var">$config</span>[<span class="php-quote">'fulfilled'</span>])) {
</span><span id="60" class="l"> <span class="php-var">$this</span>->onFulfilled = <span class="php-var">$config</span>[<span class="php-quote">'fulfilled'</span>];
</span><span id="61" class="l"> }
</span><span id="62" class="l">
</span><span id="63" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">isset</span>(<span class="php-var">$config</span>[<span class="php-quote">'rejected'</span>])) {
</span><span id="64" class="l"> <span class="php-var">$this</span>->onRejected = <span class="php-var">$config</span>[<span class="php-quote">'rejected'</span>];
</span><span id="65" class="l"> }
</span><span id="66" class="l"> }
</span><span id="67" class="l">
</span><span id="68" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> promise()
</span><span id="69" class="l"> {
</span><span id="70" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>) {
</span><span id="71" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>;
</span><span id="72" class="l"> }
</span><span id="73" class="l">
</span><span id="74" class="l"> <span class="php-keyword1">try</span> {
</span><span id="75" class="l"> <span class="php-var">$this</span>->createPromise();
</span><span id="76" class="l"> <span class="php-var">$this</span>->iterable-><span class="php-keyword2">rewind</span>();
</span><span id="77" class="l"> <span class="php-var">$this</span>->refillPending();
</span><span id="78" class="l"> } <span class="php-keyword1">catch</span> (\Throwable <span class="php-var">$e</span>) {
</span><span id="79" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->reject(<span class="php-var">$e</span>);
</span><span id="80" class="l"> } <span class="php-keyword1">catch</span> (\Exception <span class="php-var">$e</span>) {
</span><span id="81" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->reject(<span class="php-var">$e</span>);
</span><span id="82" class="l"> }
</span><span id="83" class="l">
</span><span id="84" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>;
</span><span id="85" class="l"> }
</span><span id="86" class="l">
</span><span id="87" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> createPromise()
</span><span id="88" class="l"> {
</span><span id="89" class="l"> <span class="php-var">$this</span>->mutex = <span class="php-keyword1">false</span>;
</span><span id="90" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span> = <span class="php-keyword1">new</span> Promise(<span class="php-keyword1">function</span> () {
</span><span id="91" class="l"> <span class="php-keyword2">reset</span>(<span class="php-var">$this</span>->pending);
</span><span id="92" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">empty</span>(<span class="php-var">$this</span>->pending) && !<span class="php-var">$this</span>->iterable->valid()) {
</span><span id="93" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->resolve(<span class="php-keyword1">null</span>);
</span><span id="94" class="l"> <span class="php-keyword1">return</span>;
</span><span id="95" class="l"> }
</span><span id="96" class="l">
</span><span id="97" class="l"> <span class="php-comment">// Consume a potentially fluctuating list of promises while</span>
</span><span id="98" class="l"> <span class="php-comment">// ensuring that indexes are maintained (precluding array_shift).</span>
</span><span id="99" class="l"> <span class="php-keyword1">while</span> (<span class="php-var">$promise</span> = <span class="php-keyword2">current</span>(<span class="php-var">$this</span>->pending)) {
</span><span id="100" class="l"> <span class="php-keyword2">next</span>(<span class="php-var">$this</span>->pending);
</span><span id="101" class="l"> <span class="php-var">$promise</span>->wait();
</span><span id="102" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->getState() !== PromiseInterface::PENDING) {
</span><span id="103" class="l"> <span class="php-keyword1">return</span>;
</span><span id="104" class="l"> }
</span><span id="105" class="l"> }
</span><span id="106" class="l"> });
</span><span id="107" class="l">
</span><span id="108" class="l"> <span class="php-comment">// Clear the references when the promise is resolved.</span>
</span><span id="109" class="l"> <span class="php-var">$clearFn</span> = <span class="php-keyword1">function</span> () {
</span><span id="110" class="l"> <span class="php-var">$this</span>->iterable = <span class="php-var">$this</span>->concurrency = <span class="php-var">$this</span>->pending = <span class="php-keyword1">null</span>;
</span><span id="111" class="l"> <span class="php-var">$this</span>->onFulfilled = <span class="php-var">$this</span>->onRejected = <span class="php-keyword1">null</span>;
</span><span id="112" class="l"> };
</span><span id="113" class="l">
</span><span id="114" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->then(<span class="php-var">$clearFn</span>, <span class="php-var">$clearFn</span>);
</span><span id="115" class="l"> }
</span><span id="116" class="l">
</span><span id="117" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> refillPending()
</span><span id="118" class="l"> {
</span><span id="119" class="l"> <span class="php-keyword1">if</span> (!<span class="php-var">$this</span>->concurrency) {
</span><span id="120" class="l"> <span class="php-comment">// Add all pending promises.</span>
</span><span id="121" class="l"> <span class="php-keyword1">while</span> (<span class="php-var">$this</span>->addPending() && <span class="php-var">$this</span>->advanceIterator());
</span><span id="122" class="l"> <span class="php-keyword1">return</span>;
</span><span id="123" class="l"> }
</span><span id="124" class="l">
</span><span id="125" class="l"> <span class="php-comment">// Add only up to N pending promises.</span>
</span><span id="126" class="l"> <span class="php-var">$concurrency</span> = <span class="php-keyword2">is_callable</span>(<span class="php-var">$this</span>->concurrency)
</span><span id="127" class="l"> ? <span class="php-keyword2">call_user_func</span>(<span class="php-var">$this</span>->concurrency, <span class="php-keyword2">count</span>(<span class="php-var">$this</span>->pending))
</span><span id="128" class="l"> : <span class="php-var">$this</span>->concurrency;
</span><span id="129" class="l"> <span class="php-var">$concurrency</span> = <span class="php-keyword2">max</span>(<span class="php-var">$concurrency</span> - <span class="php-keyword2">count</span>(<span class="php-var">$this</span>->pending), <span class="php-num">0</span>);
</span><span id="130" class="l"> <span class="php-comment">// Concurrency may be set to 0 to disallow new promises.</span>
</span><span id="131" class="l"> <span class="php-keyword1">if</span> (!<span class="php-var">$concurrency</span>) {
</span><span id="132" class="l"> <span class="php-keyword1">return</span>;
</span><span id="133" class="l"> }
</span><span id="134" class="l"> <span class="php-comment">// Add the first pending promise.</span>
</span><span id="135" class="l"> <span class="php-var">$this</span>->addPending();
</span><span id="136" class="l"> <span class="php-comment">// Note this is special handling for concurrency=1 so that we do</span>
</span><span id="137" class="l"> <span class="php-comment">// not advance the iterator after adding the first promise. This</span>
</span><span id="138" class="l"> <span class="php-comment">// helps work around issues with generators that might not have the</span>
</span><span id="139" class="l"> <span class="php-comment">// next value to yield until promise callbacks are called.</span>
</span><span id="140" class="l"> <span class="php-keyword1">while</span> (--<span class="php-var">$concurrency</span>
</span><span id="141" class="l"> && <span class="php-var">$this</span>->advanceIterator()
</span><span id="142" class="l"> && <span class="php-var">$this</span>->addPending());
</span><span id="143" class="l"> }
</span><span id="144" class="l">
</span><span id="145" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> addPending()
</span><span id="146" class="l"> {
</span><span id="147" class="l"> <span class="php-keyword1">if</span> (!<span class="php-var">$this</span>->iterable || !<span class="php-var">$this</span>->iterable->valid()) {
</span><span id="148" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="149" class="l"> }
</span><span id="150" class="l">
</span><span id="151" class="l"> <span class="php-var">$promise</span> = promise_for(<span class="php-var">$this</span>->iterable-><span class="php-keyword2">current</span>());
</span><span id="152" class="l"> <span class="php-var">$idx</span> = <span class="php-var">$this</span>->iterable-><span class="php-keyword2">key</span>();
</span><span id="153" class="l">
</span><span id="154" class="l"> <span class="php-var">$this</span>->pending[<span class="php-var">$idx</span>] = <span class="php-var">$promise</span>->then(
</span><span id="155" class="l"> <span class="php-keyword1">function</span> (<span class="php-var">$value</span>) <span class="php-keyword1">use</span> (<span class="php-var">$idx</span>) {
</span><span id="156" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->onFulfilled) {
</span><span id="157" class="l"> <span class="php-keyword2">call_user_func</span>(
</span><span id="158" class="l"> <span class="php-var">$this</span>->onFulfilled, <span class="php-var">$value</span>, <span class="php-var">$idx</span>, <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>
</span><span id="159" class="l"> );
</span><span id="160" class="l"> }
</span><span id="161" class="l"> <span class="php-var">$this</span>->step(<span class="php-var">$idx</span>);
</span><span id="162" class="l"> },
</span><span id="163" class="l"> <span class="php-keyword1">function</span> (<span class="php-var">$reason</span>) <span class="php-keyword1">use</span> (<span class="php-var">$idx</span>) {
</span><span id="164" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->onRejected) {
</span><span id="165" class="l"> <span class="php-keyword2">call_user_func</span>(
</span><span id="166" class="l"> <span class="php-var">$this</span>->onRejected, <span class="php-var">$reason</span>, <span class="php-var">$idx</span>, <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>
</span><span id="167" class="l"> );
</span><span id="168" class="l"> }
</span><span id="169" class="l"> <span class="php-var">$this</span>->step(<span class="php-var">$idx</span>);
</span><span id="170" class="l"> }
</span><span id="171" class="l"> );
</span><span id="172" class="l">
</span><span id="173" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">true</span>;
</span><span id="174" class="l"> }
</span><span id="175" class="l">
</span><span id="176" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> advanceIterator()
</span><span id="177" class="l"> {
</span><span id="178" class="l"> <span class="php-comment">// Place a lock on the iterator so that we ensure to not recurse,</span>
</span><span id="179" class="l"> <span class="php-comment">// preventing fatal generator errors.</span>
</span><span id="180" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->mutex) {
</span><span id="181" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="182" class="l"> }
</span><span id="183" class="l">
</span><span id="184" class="l"> <span class="php-var">$this</span>->mutex = <span class="php-keyword1">true</span>;
</span><span id="185" class="l">
</span><span id="186" class="l"> <span class="php-keyword1">try</span> {
</span><span id="187" class="l"> <span class="php-var">$this</span>->iterable-><span class="php-keyword2">next</span>();
</span><span id="188" class="l"> <span class="php-var">$this</span>->mutex = <span class="php-keyword1">false</span>;
</span><span id="189" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">true</span>;
</span><span id="190" class="l"> } <span class="php-keyword1">catch</span> (\Throwable <span class="php-var">$e</span>) {
</span><span id="191" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->reject(<span class="php-var">$e</span>);
</span><span id="192" class="l"> <span class="php-var">$this</span>->mutex = <span class="php-keyword1">false</span>;
</span><span id="193" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="194" class="l"> } <span class="php-keyword1">catch</span> (\Exception <span class="php-var">$e</span>) {
</span><span id="195" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->reject(<span class="php-var">$e</span>);
</span><span id="196" class="l"> <span class="php-var">$this</span>->mutex = <span class="php-keyword1">false</span>;
</span><span id="197" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="198" class="l"> }
</span><span id="199" class="l"> }
</span><span id="200" class="l">
</span><span id="201" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> step(<span class="php-var">$idx</span>)
</span><span id="202" class="l"> {
</span><span id="203" class="l"> <span class="php-comment">// If the promise was already resolved, then ignore this step.</span>
</span><span id="204" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->getState() !== PromiseInterface::PENDING) {
</span><span id="205" class="l"> <span class="php-keyword1">return</span>;
</span><span id="206" class="l"> }
</span><span id="207" class="l">
</span><span id="208" class="l"> <span class="php-keyword1">unset</span>(<span class="php-var">$this</span>->pending[<span class="php-var">$idx</span>]);
</span><span id="209" class="l">
</span><span id="210" class="l"> <span class="php-comment">// Only refill pending promises if we are not locked, preventing the</span>
</span><span id="211" class="l"> <span class="php-comment">// EachPromise to recursively invoke the provided iterator, which</span>
</span><span id="212" class="l"> <span class="php-comment">// cause a fatal error: "Cannot resume an already running generator"</span>
</span><span id="213" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$this</span>->advanceIterator() && !<span class="php-var">$this</span>->checkIfFinished()) {
</span><span id="214" class="l"> <span class="php-comment">// Add more pending promises if possible.</span>
</span><span id="215" class="l"> <span class="php-var">$this</span>->refillPending();
</span><span id="216" class="l"> }
</span><span id="217" class="l"> }
</span><span id="218" class="l">
</span><span id="219" class="l"> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> checkIfFinished()
</span><span id="220" class="l"> {
</span><span id="221" class="l"> <span class="php-keyword1">if</span> (!<span class="php-var">$this</span>->pending && !<span class="php-var">$this</span>->iterable->valid()) {
</span><span id="222" class="l"> <span class="php-comment">// Resolve the promise if there's nothing left to do.</span>
</span><span id="223" class="l"> <span class="php-var">$this</span>-><span class="php-keyword2">aggregate</span>->resolve(<span class="php-keyword1">null</span>);
</span><span id="224" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">true</span>;
</span><span id="225" class="l"> }
</span><span id="226" class="l">
</span><span id="227" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="228" class="l"> }
</span><span id="229" class="l">}
</span><span id="230" class="l"></span></code></pre>
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