274 lines
7.4 KiB
PHP
274 lines
7.4 KiB
PHP
<?php
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namespace GuzzleHttp;
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use Psr\Http\Message\RequestInterface;
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/**
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* Creates a composed Guzzle handler function by stacking middlewares on top of
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* an HTTP handler function.
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*/
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class HandlerStack
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{
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/** @var callable */
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private $handler;
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/** @var array */
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private $stack = [];
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/** @var callable|null */
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private $cached;
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/**
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* Creates a default handler stack that can be used by clients.
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*
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* The returned handler will wrap the provided handler or use the most
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* appropriate default handler for your system. The returned HandlerStack has
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* support for cookies, redirects, HTTP error exceptions, and preparing a body
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* before sending.
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*
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* The returned handler stack can be passed to a client in the "handler"
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* option.
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*
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* @param callable $handler HTTP handler function to use with the stack. If no
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* handler is provided, the best handler for your
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* system will be utilized.
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*
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* @return HandlerStack
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*/
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public static function create(callable $handler = null)
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{
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$stack = new self($handler ?: choose_handler());
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$stack->push(Middleware::httpErrors(), 'http_errors');
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$stack->push(Middleware::redirect(), 'allow_redirects');
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$stack->push(Middleware::cookies(), 'cookies');
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$stack->push(Middleware::prepareBody(), 'prepare_body');
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return $stack;
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}
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/**
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* @param callable $handler Underlying HTTP handler.
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*/
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public function __construct(callable $handler = null)
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{
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$this->handler = $handler;
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}
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/**
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* Invokes the handler stack as a composed handler
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*
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* @param RequestInterface $request
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* @param array $options
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*/
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public function __invoke(RequestInterface $request, array $options)
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{
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$handler = $this->resolve();
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return $handler($request, $options);
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}
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/**
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* Dumps a string representation of the stack.
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*
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* @return string
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*/
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public function __toString()
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{
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$depth = 0;
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$stack = [];
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if ($this->handler) {
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$stack[] = "0) Handler: " . $this->debugCallable($this->handler);
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}
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$result = '';
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foreach (array_reverse($this->stack) as $tuple) {
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$depth++;
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$str = "{$depth}) Name: '{$tuple[1]}', ";
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$str .= "Function: " . $this->debugCallable($tuple[0]);
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$result = "> {$str}\n{$result}";
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$stack[] = $str;
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}
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foreach (array_keys($stack) as $k) {
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$result .= "< {$stack[$k]}\n";
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}
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return $result;
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}
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/**
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* Set the HTTP handler that actually returns a promise.
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*
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* @param callable $handler Accepts a request and array of options and
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* returns a Promise.
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*/
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public function setHandler(callable $handler)
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{
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$this->handler = $handler;
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$this->cached = null;
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}
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/**
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* Returns true if the builder has a handler.
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*
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* @return bool
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*/
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public function hasHandler()
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{
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return (bool) $this->handler;
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}
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/**
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* Unshift a middleware to the bottom of the stack.
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*
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* @param callable $middleware Middleware function
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* @param string $name Name to register for this middleware.
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*/
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public function unshift(callable $middleware, $name = null)
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{
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array_unshift($this->stack, [$middleware, $name]);
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$this->cached = null;
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}
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/**
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* Push a middleware to the top of the stack.
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*
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* @param callable $middleware Middleware function
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* @param string $name Name to register for this middleware.
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*/
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public function push(callable $middleware, $name = '')
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{
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$this->stack[] = [$middleware, $name];
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$this->cached = null;
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}
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/**
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* Add a middleware before another middleware by name.
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*
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* @param string $findName Middleware to find
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* @param callable $middleware Middleware function
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* @param string $withName Name to register for this middleware.
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*/
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public function before($findName, callable $middleware, $withName = '')
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{
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$this->splice($findName, $withName, $middleware, true);
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}
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/**
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* Add a middleware after another middleware by name.
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*
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* @param string $findName Middleware to find
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* @param callable $middleware Middleware function
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* @param string $withName Name to register for this middleware.
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*/
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public function after($findName, callable $middleware, $withName = '')
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{
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$this->splice($findName, $withName, $middleware, false);
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}
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/**
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* Remove a middleware by instance or name from the stack.
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*
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* @param callable|string $remove Middleware to remove by instance or name.
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*/
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public function remove($remove)
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{
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$this->cached = null;
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$idx = is_callable($remove) ? 0 : 1;
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$this->stack = array_values(array_filter(
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$this->stack,
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function ($tuple) use ($idx, $remove) {
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return $tuple[$idx] !== $remove;
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}
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));
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}
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/**
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* Compose the middleware and handler into a single callable function.
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*
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* @return callable
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*/
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public function resolve()
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{
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if (!$this->cached) {
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if (!($prev = $this->handler)) {
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throw new \LogicException('No handler has been specified');
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}
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foreach (array_reverse($this->stack) as $fn) {
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$prev = $fn[0]($prev);
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}
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$this->cached = $prev;
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}
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return $this->cached;
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}
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/**
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* @param $name
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* @return int
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*/
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private function findByName($name)
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{
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foreach ($this->stack as $k => $v) {
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if ($v[1] === $name) {
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return $k;
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}
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}
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throw new \InvalidArgumentException("Middleware not found: $name");
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}
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/**
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* Splices a function into the middleware list at a specific position.
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*
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* @param $findName
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* @param $withName
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* @param callable $middleware
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* @param $before
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*/
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private function splice($findName, $withName, callable $middleware, $before)
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{
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$this->cached = null;
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$idx = $this->findByName($findName);
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$tuple = [$middleware, $withName];
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if ($before) {
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if ($idx === 0) {
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array_unshift($this->stack, $tuple);
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} else {
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$replacement = [$tuple, $this->stack[$idx]];
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array_splice($this->stack, $idx, 1, $replacement);
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}
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} elseif ($idx === count($this->stack) - 1) {
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$this->stack[] = $tuple;
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} else {
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$replacement = [$this->stack[$idx], $tuple];
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array_splice($this->stack, $idx, 1, $replacement);
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}
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}
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/**
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* Provides a debug string for a given callable.
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*
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* @param array|callable $fn Function to write as a string.
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*
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* @return string
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*/
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private function debugCallable($fn)
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{
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if (is_string($fn)) {
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return "callable({$fn})";
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}
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if (is_array($fn)) {
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return is_string($fn[0])
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? "callable({$fn[0]}::{$fn[1]})"
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: "callable(['" . get_class($fn[0]) . "', '{$fn[1]}'])";
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}
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return 'callable(' . spl_object_hash($fn) . ')';
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}
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}
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