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<?php
namespace GuzzleHttp\Promise;
final class Is
{
/**
* Returns true if a promise is pending.
*
* @return bool
*/
public static function pending(PromiseInterface $promise)
{
return $promise->getState() === PromiseInterface::PENDING;
}
/**
* Returns true if a promise is fulfilled or rejected.
*
* @return bool
*/
public static function settled(PromiseInterface $promise)
{
return $promise->getState() !== PromiseInterface::PENDING;
}
/**
* Returns true if a promise is fulfilled.
*
* @return bool
*/
public static function fulfilled(PromiseInterface $promise)
{
return $promise->getState() === PromiseInterface::FULFILLED;
}
/**
* Returns true if a promise is rejected.
*
* @return bool
*/
public static function rejected(PromiseInterface $promise)
{
return $promise->getState() === PromiseInterface::REJECTED;
}
}
<?php
namespace GuzzleHttp\Promise;
/**
* Promises/A+ implementation that avoids recursion when possible.
*
* @link https://promisesaplus.com/
*/
class Promise implements PromiseInterface
{
private $state = self::PENDING;
private $result;
private $cancelFn;
private $waitFn;
private $waitList;
private $handlers = [];
/**
* @param callable $waitFn Fn that when invoked resolves the promise.
* @param callable $cancelFn Fn that when invoked cancels the promise.
*/
public function __construct(
callable $waitFn = null,
callable $cancelFn = null
) {
$this->waitFn = $waitFn;
$this->cancelFn = $cancelFn;
}
public function then(
callable $onFulfilled = null,
callable $onRejected = null
) {
if ($this->state === self::PENDING) {
$p = new Promise(null, [$this, 'cancel']);
$this->handlers[] = [$p, $onFulfilled, $onRejected];
$p->waitList = $this->waitList;
$p->waitList[] = $this;
return $p;
}
// Return a fulfilled promise and immediately invoke any callbacks.
if ($this->state === self::FULFILLED) {
$promise = Create::promiseFor($this->result);
return $onFulfilled ? $promise->then($onFulfilled) : $promise;
}
// It's either cancelled or rejected, so return a rejected promise
// and immediately invoke any callbacks.
$rejection = Create::rejectionFor($this->result);
return $onRejected ? $rejection->then(null, $onRejected) : $rejection;
}
public function otherwise(callable $onRejected)
{
return $this->then(null, $onRejected);
}
public function wait($unwrap = true)
{
$this->waitIfPending();
if ($this->result instanceof PromiseInterface) {
return $this->result->wait($unwrap);
}
if ($unwrap) {
if ($this->state === self::FULFILLED) {
return $this->result;
}
// It's rejected so "unwrap" and throw an exception.
throw Create::exceptionFor($this->result);
}
}
public function getState()
{
return $this->state;
}
public function cancel()
{
if ($this->state !== self::PENDING) {
return;
}
$this->waitFn = $this->waitList = null;
if ($this->cancelFn) {
$fn = $this->cancelFn;
$this->cancelFn = null;
try {
$fn();
} catch (\Throwable $e) {
$this->reject($e);
} catch (\Exception $e) {
$this->reject($e);
}
}
// Reject the promise only if it wasn't rejected in a then callback.
/** @psalm-suppress RedundantCondition */
if ($this->state === self::PENDING) {
$this->reject(new CancellationException('Promise has been cancelled'));
}
}
public function resolve($value)
{
$this->settle(self::FULFILLED, $value);
}
public function reject($reason)
{
$this->settle(self::REJECTED, $reason);
}
private function settle($state, $value)
{
if ($this->state !== self::PENDING) {
// Ignore calls with the same resolution.
if ($state === $this->state && $value === $this->result) {
return;
}
throw $this->state === $state
? new \LogicException("The promise is already {$state}.")
: new \LogicException("Cannot change a {$this->state} promise to {$state}");
}
if ($value === $this) {
throw new \LogicException('Cannot fulfill or reject a promise with itself');
}
// Clear out the state of the promise but stash the handlers.
$this->state = $state;
$this->result = $value;
$handlers = $this->handlers;
$this->handlers = null;
$this->waitList = $this->waitFn = null;
$this->cancelFn = null;
if (!$handlers) {
return;
}
// If the value was not a settled promise or a thenable, then resolve
// it in the task queue using the correct ID.
if (!is_object($value) || !method_exists($value, 'then')) {
$id = $state === self::FULFILLED ? 1 : 2;
// It's a success, so resolve the handlers in the queue.
Utils::queue()->add(static function () use ($id, $value, $handlers) {
foreach ($handlers as $handler) {
self::callHandler($id, $value, $handler);
}
});
} elseif ($value instanceof Promise && Is::pending($value)) {
// We can just merge our handlers onto the next promise.
$value->handlers = array_merge($value->handlers, $handlers);
} else {
// Resolve the handlers when the forwarded promise is resolved.
$value->then(
static function ($value) use ($handlers) {
foreach ($handlers as $handler) {
self::callHandler(1, $value, $handler);
}
},
static function ($reason) use ($handlers) {
foreach ($handlers as $handler) {
self::callHandler(2, $reason, $handler);
}
}
);
}
}
/**
* Call a stack of handlers using a specific callback index and value.
*
* @param int $index 1 (resolve) or 2 (reject).
* @param mixed $value Value to pass to the callback.
* @param array $handler Array of handler data (promise and callbacks).
*/
private static function callHandler($index, $value, array $handler)
{
/** @var PromiseInterface $promise */
$promise = $handler[0];
// The promise may have been cancelled or resolved before placing
// this thunk in the queue.
if (Is::settled($promise)) {
return;
}
try {
if (isset($handler[$index])) {
/*
* If $f throws an exception, then $handler will be in the exception
* stack trace. Since $handler contains a reference to the callable
* itself we get a circular reference. We clear the $handler
* here to avoid that memory leak.
*/
$f = $handler[$index];
unset($handler);
$promise->resolve($f($value));
} elseif ($index === 1) {
// Forward resolution values as-is.
$promise->resolve($value);
} else {
// Forward rejections down the chain.
$promise->reject($value);
}
} catch (\Throwable $reason) {
$promise->reject($reason);
} catch (\Exception $reason) {
$promise->reject($reason);
}
}
private function waitIfPending()
{
if ($this->state !== self::PENDING) {
return;
} elseif ($this->waitFn) {
$this->invokeWaitFn();
} elseif ($this->waitList) {
$this->invokeWaitList();
} else {
// If there's no wait function, then reject the promise.
$this->reject('Cannot wait on a promise that has '
. 'no internal wait function. You must provide a wait '
. 'function when constructing the promise to be able to '
. 'wait on a promise.');
}
Utils::queue()->run();
/** @psalm-suppress RedundantCondition */
if ($this->state === self::PENDING) {
$this->reject('Invoking the wait callback did not resolve the promise');
}
}
private function invokeWaitFn()
{
try {
$wfn = $this->waitFn;
$this->waitFn = null;
$wfn(true);
} catch (\Exception $reason) {
if ($this->state === self::PENDING) {
// The promise has not been resolved yet, so reject the promise
// with the exception.
$this->reject($reason);
} else {
// The promise was already resolved, so there's a problem in
// the application.
throw $reason;
}
}
}
private function invokeWaitList()
{
$waitList = $this->waitList;
$this->waitList = null;
foreach ($waitList as $result) {
do {
$result->waitIfPending();
$result = $result->result;
} while ($result instanceof Promise);
if ($result instanceof PromiseInterface) {
$result->wait(false);
}
}
}
}
<?php
namespace GuzzleHttp\Promise;
/**
* A promise represents the eventual result of an asynchronous operation.
*
* The primary way of interacting with a promise is through its then method,
* which registers callbacks to receive either a promise’s eventual value or
* the reason why the promise cannot be fulfilled.
*
* @link https://promisesaplus.com/
*/
interface PromiseInterface
{
const PENDING = 'pending';
const FULFILLED = 'fulfilled';
const REJECTED = 'rejected';
/**
* Appends fulfillment and rejection handlers to the promise, and returns
* a new promise resolving to the return value of the called handler.
*
* @param callable $onFulfilled Invoked when the promise fulfills.
* @param callable $onRejected Invoked when the promise is rejected.
*
* @return PromiseInterface
*/
public function then(
callable $onFulfilled = null,
callable $onRejected = null
);
/**
* Appends a rejection handler callback to the promise, and returns a new
* promise resolving to the return value of the callback if it is called,
* or to its original fulfillment value if the promise is instead
* fulfilled.
*
* @param callable $onRejected Invoked when the promise is rejected.
*
* @return PromiseInterface
*/
public function otherwise(callable $onRejected);
/**
* Get the state of the promise ("pending", "rejected", or "fulfilled").
*
* The three states can be checked against the constants defined on
* PromiseInterface: PENDING, FULFILLED, and REJECTED.
*
* @return string
*/
public function getState();
/**
* Resolve the promise with the given value.
*
* @param mixed $value
*
* @throws \RuntimeException if the promise is already resolved.
*/
public function resolve($value);
/**
* Reject the promise with the given reason.
*
* @param mixed $reason
*
* @throws \RuntimeException if the promise is already resolved.
*/
public function reject($reason);
/**
* Cancels the promise if possible.
*
* @link https://github.com/promises-aplus/cancellation-spec/issues/7
*/
public function cancel();
/**
* Waits until the promise completes if possible.
*
* Pass $unwrap as true to unwrap the result of the promise, either
* returning the resolved value or throwing the rejected exception.
*
* If the promise cannot be waited on, then the promise will be rejected.
*
* @param bool $unwrap
*
* @return mixed
*
* @throws \LogicException if the promise has no wait function or if the
* promise does not settle after waiting.
*/
public function wait($unwrap = true);
}
<?php
namespace GuzzleHttp\Promise;
/**
* Interface used with classes that return a promise.
*/
interface PromisorInterface
{
/**
* Returns a promise.
*
* @return PromiseInterface
*/
public function promise();
}
<?php
namespace GuzzleHttp\Promise;
/**
* A promise that has been rejected.
*
* Thenning off of this promise will invoke the onRejected callback
* immediately and ignore other callbacks.
*/
class RejectedPromise implements PromiseInterface
{
private $reason;
public function __construct($reason)
{
if (is_object($reason) && method_exists($reason, 'then')) {
throw new \InvalidArgumentException(
'You cannot create a RejectedPromise with a promise.'
);
}
$this->reason = $reason;
}
public function then(
callable $onFulfilled = null,
callable $onRejected = null
) {
// If there's no onRejected callback then just return self.
if (!$onRejected) {
return $this;
}
$queue = Utils::queue();
$reason = $this->reason;
$p = new Promise([$queue, 'run']);
$queue->add(static function () use ($p, $reason, $onRejected) {
if (Is::pending($p)) {
try {
// Return a resolved promise if onRejected does not throw.
$p->resolve($onRejected($reason));
} catch (\Throwable $e) {
// onRejected threw, so return a rejected promise.
$p->reject($e);
} catch (\Exception $e) {
// onRejected threw, so return a rejected promise.
$p->reject($e);
}
}
});
return $p;
}
public function otherwise(callable $onRejected)
{
return $this->then(null, $onRejected);
}
public function wait($unwrap = true, $defaultDelivery = null)
{
if ($unwrap) {
throw Create::exceptionFor($this->reason);
}
return null;
}
public function getState()
{
return self::REJECTED;
}
public function resolve($value)
{
throw new \LogicException("Cannot resolve a rejected promise");
}
public function reject($reason)
{
if ($reason !== $this->reason) {
throw new \LogicException("Cannot reject a rejected promise");
}
}
public function cancel()
{
// pass
}
}
<?php
namespace GuzzleHttp\Promise;
/**
* A special exception that is thrown when waiting on a rejected promise.
*
* The reason value is available via the getReason() method.
*/
class RejectionException extends \RuntimeException
{
/** @var mixed Rejection reason. */
private $reason;
/**
* @param mixed $reason Rejection reason.
* @param string $description Optional description
*/
public function __construct($reason, $description = null)
{
$this->reason = $reason;
$message = 'The promise was rejected';
if ($description) {
$message .= ' with reason: ' . $description;
} elseif (is_string($reason)
|| (is_object($reason) && method_exists($reason, '__toString'))
) {
$message .= ' with reason: ' . $this->reason;
} elseif ($reason instanceof \JsonSerializable) {
$message .= ' with reason: '
. json_encode($this->reason, JSON_PRETTY_PRINT);
}
parent::__construct($message);
}
/**
* Returns the rejection reason.
*
* @return mixed
*/
public function getReason()
{
return $this->reason;
}
}
<?php
namespace GuzzleHttp\Promise;
/**
* A task queue that executes tasks in a FIFO order.
*
* This task queue class is used to settle promises asynchronously and
* maintains a constant stack size. You can use the task queue asynchronously
* by calling the `run()` function of the global task queue in an event loop.
*
* GuzzleHttp\Promise\Utils::queue()->run();
*/
class TaskQueue implements TaskQueueInterface
{
private $enableShutdown = true;
private $queue = [];
public function __construct($withShutdown = true)
{
if ($withShutdown) {
register_shutdown_function(function () {
if ($this->enableShutdown) {
// Only run the tasks if an E_ERROR didn't occur.
$err = error_get_last();
if (!$err || ($err['type'] ^ E_ERROR)) {
$this->run();
}
}
});
}
}
public function isEmpty()
{
return !$this->queue;
}
public function add(callable $task)
{
$this->queue[] = $task;
}
public function run()
{
while ($task = array_shift($this->queue)) {
/** @var callable $task */
$task();
}
}
/**
* The task queue will be run and exhausted by default when the process
* exits IFF the exit is not the result of a PHP E_ERROR error.
*
* You can disable running the automatic shutdown of the queue by calling
* this function. If you disable the task queue shutdown process, then you
* MUST either run the task queue (as a result of running your event loop
* or manually using the run() method) or wait on each outstanding promise.
*
* Note: This shutdown will occur before any destructors are triggered.
*/
public function disableShutdown()
{
$this->enableShutdown = false;
}
}
<?php
namespace GuzzleHttp\Promise;
interface TaskQueueInterface
{
/**
* Returns true if the queue is empty.
*
* @return bool
*/
public function isEmpty();
/**
* Adds a task to the queue that will be executed the next time run is
* called.
*/
public function add(callable $task);
/**
* Execute all of the pending task in the queue.
*/
public function run();
}
<?php
namespace GuzzleHttp\Promise;
final class Utils
{
/**
* Get the global task queue used for promise resolution.
*
* This task queue MUST be run in an event loop in order for promises to be
* settled asynchronously. It will be automatically run when synchronously
* waiting on a promise.
*
* <code>
* while ($eventLoop->isRunning()) {
* GuzzleHttp\Promise\Utils::queue()->run();
* }
* </code>
*
* @param TaskQueueInterface $assign Optionally specify a new queue instance.
*
* @return TaskQueueInterface
*/
public static function queue(TaskQueueInterface $assign = null)
{
static $queue;
if ($assign) {
$queue = $assign;
} elseif (!$queue) {
$queue = new TaskQueue();
}
return $queue;
}
/**
* Adds a function to run in the task queue when it is next `run()` and
* returns a promise that is fulfilled or rejected with the result.
*
* @param callable $task Task function to run.
*
* @return PromiseInterface
*/
public static function task(callable $task)
{
$queue = self::queue();
$promise = new Promise([$queue, 'run']);
$queue->add(function () use ($task, $promise) {
try {
$promise->resolve($task());
} catch (\Throwable $e) {
$promise->reject($e);
} catch (\Exception $e) {
$promise->reject($e);
}
});
return $promise;
}
/**
* Synchronously waits on a promise to resolve and returns an inspection
* state array.
*
* Returns a state associative array containing a "state" key mapping to a
* valid promise state. If the state of the promise is "fulfilled", the
* array will contain a "value" key mapping to the fulfilled value of the
* promise. If the promise is rejected, the array will contain a "reason"
* key mapping to the rejection reason of the promise.
*
* @param PromiseInterface $promise Promise or value.
*
* @return array
*/
public static function inspect(PromiseInterface $promise)
{
try {
return [
'state' => PromiseInterface::FULFILLED,
'value' => $promise->wait()
];
} catch (RejectionException $e) {
return ['state' => PromiseInterface::REJECTED, 'reason' => $e->getReason()];
} catch (\Throwable $e) {
return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
} catch (\Exception $e) {
return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
}
}
/**
* Waits on all of the provided promises, but does not unwrap rejected
* promises as thrown exception.
*
* Returns an array of inspection state arrays.
*
* @see inspect for the inspection state array format.
*
* @param PromiseInterface[] $promises Traversable of promises to wait upon.
*
* @return array
*/
public static function inspectAll($promises)
{
$results = [];
foreach ($promises as $key => $promise) {
$results[$key] = inspect($promise);
}
return $results;
}
/**
* Waits on all of the provided promises and returns the fulfilled values.
*
* Returns an array that contains the value of each promise (in the same
* order the promises were provided). An exception is thrown if any of the
* promises are rejected.
*
* @param iterable<PromiseInterface> $promises Iterable of PromiseInterface objects to wait on.
*
* @return array
*
* @throws \Exception on error
* @throws \Throwable on error in PHP >=7
*/
public static function unwrap($promises)
{
$results = [];
foreach ($promises as $key => $promise) {
$results[$key] = $promise->wait();
}
return $results;
}
/**
* Given an array of promises, return a promise that is fulfilled when all
* the items in the array are fulfilled.
*
* The promise's fulfillment value is an array with fulfillment values at
* respective positions to the original array. If any promise in the array
* rejects, the returned promise is rejected with the rejection reason.
*
* @param mixed $promises Promises or values.
* @param bool $recursive If true, resolves new promises that might have been added to the stack during its own resolution.
*
* @return PromiseInterface
*/
public static function all($promises, $recursive = false)
{
$results = [];
$promise = Each::of(
$promises,
function ($value, $idx) use (&$results) {
$results[$idx] = $value;
},
function ($reason, $idx, Promise $aggregate) {
$aggregate->reject($reason);
}
)->then(function () use (&$results) {
ksort($results);
return $results;
});
if (true === $recursive) {
$promise = $promise->then(function ($results) use ($recursive, &$promises) {
foreach ($promises as $promise) {
if (Is::pending($promise)) {
return self::all($promises, $recursive);
}
}
return $results;
});
}
return $promise;
}
/**
* Initiate a competitive race between multiple promises or values (values
* will become immediately fulfilled promises).
*
* When count amount of promises have been fulfilled, the returned promise
* is fulfilled with an array that contains the fulfillment values of the
* winners in order of resolution.
*
* This promise is rejected with a {@see AggregateException} if the number
* of fulfilled promises is less than the desired $count.
*
* @param int $count Total number of promises.
* @param mixed $promises Promises or values.
*
* @return PromiseInterface
*/
public static function some($count, $promises)
{
$results = [];
$rejections = [];
return Each::of(
$promises,
function ($value, $idx, PromiseInterface $p) use (&$results, $count) {
if (Is::settled($p)) {
return;
}
$results[$idx] = $value;
if (count($results) >= $count) {
$p->resolve(null);
}
},
function ($reason) use (&$rejections) {
$rejections[] = $reason;
}
)->then(
function () use (&$results, &$rejections, $count) {
if (count($results) !== $count) {
throw new AggregateException(
'Not enough promises to fulfill count',
$rejections
);
}
ksort($results);
return array_values($results);
}
);
}
/**
* Like some(), with 1 as count. However, if the promise fulfills, the
* fulfillment value is not an array of 1 but the value directly.
*
* @param mixed $promises Promises or values.
*
* @return PromiseInterface
*/
public static function any($promises)
{
return self::some(1, $promises)->then(function ($values) {
return $values[0];
});
}
/**
* Returns a promise that is fulfilled when all of the provided promises have
* been fulfilled or rejected.
*
* The returned promise is fulfilled with an array of inspection state arrays.
*
* @see inspect for the inspection state array format.
*
* @param mixed $promises Promises or values.
*
* @return PromiseInterface
*/
public static function settle($promises)
{
$results = [];
return Each::of(
$promises,
function ($value, $idx) use (&$results) {
$results[$idx] = ['state' => PromiseInterface::FULFILLED, 'value' => $value];
},
function ($reason, $idx) use (&$results) {
$results[$idx] = ['state' => PromiseInterface::REJECTED, 'reason' => $reason];
}
)->then(function () use (&$results) {
ksort($results);
return $results;
});
}
}
<?php
namespace GuzzleHttp\Promise;
/**
* Get the global task queue used for promise resolution.
*
* This task queue MUST be run in an event loop in order for promises to be
* settled asynchronously. It will be automatically run when synchronously
* waiting on a promise.
*
* <code>
* while ($eventLoop->isRunning()) {
* GuzzleHttp\Promise\queue()->run();
* }
* </code>
*
* @param TaskQueueInterface $assign Optionally specify a new queue instance.
*
* @return TaskQueueInterface
*
* @deprecated queue will be removed in guzzlehttp/promises:2.0. Use Utils::queue instead.
*/
function queue(TaskQueueInterface $assign = null)
{
return Utils::queue($assign);
}
/**
* Adds a function to run in the task queue when it is next `run()` and returns
* a promise that is fulfilled or rejected with the result.
*
* @param callable $task Task function to run.
*
* @return PromiseInterface
*
* @deprecated task will be removed in guzzlehttp/promises:2.0. Use Utils::task instead.
*/
function task(callable $task)
{
return Utils::task($task);
}
/**
* Creates a promise for a value if the value is not a promise.
*
* @param mixed $value Promise or value.
*
* @return PromiseInterface
*
* @deprecated promise_for will be removed in guzzlehttp/promises:2.0. Use Create::promiseFor instead.
*/
function promise_for($value)
{
return Create::promiseFor($value);
}
/**
* Creates a rejected promise for a reason if the reason is not a promise. If
* the provided reason is a promise, then it is returned as-is.
*
* @param mixed $reason Promise or reason.
*
* @return PromiseInterface
*
* @deprecated rejection_for will be removed in guzzlehttp/promises:2.0. Use Create::rejectionFor instead.
*/
function rejection_for($reason)
{
return Create::rejectionFor($reason);
}
/**
* Create an exception for a rejected promise value.
*
* @param mixed $reason
*
* @return \Exception|\Throwable
*
* @deprecated exception_for will be removed in guzzlehttp/promises:2.0. Use Create::exceptionFor instead.
*/
function exception_for($reason)
{
return Create::exceptionFor($reason);
}
/**
* Returns an iterator for the given value.
*
* @param mixed $value
*
* @return \Iterator
*
* @deprecated iter_for will be removed in guzzlehttp/promises:2.0. Use Create::iterFor instead.
*/
function iter_for($value)
{
return Create::iterFor($value);
}
/**
* Synchronously waits on a promise to resolve and returns an inspection state
* array.
*
* Returns a state associative array containing a "state" key mapping to a
* valid promise state. If the state of the promise is "fulfilled", the array
* will contain a "value" key mapping to the fulfilled value of the promise. If
* the promise is rejected, the array will contain a "reason" key mapping to
* the rejection reason of the promise.
*
* @param PromiseInterface $promise Promise or value.
*
* @return array
*
* @deprecated inspect will be removed in guzzlehttp/promises:2.0. Use Utils::inspect instead.
*/
function inspect(PromiseInterface $promise)
{
return Utils::inspect($promise);
}
/**
* Waits on all of the provided promises, but does not unwrap rejected promises
* as thrown exception.
*
* Returns an array of inspection state arrays.
*
* @see inspect for the inspection state array format.
*
* @param PromiseInterface[] $promises Traversable of promises to wait upon.
*
* @return array
*
* @deprecated inspect will be removed in guzzlehttp/promises:2.0. Use Utils::inspectAll instead.
*/
function inspect_all($promises)
{
return Utils::inspectAll($promises);
}
/**
* Waits on all of the provided promises and returns the fulfilled values.
*
* Returns an array that contains the value of each promise (in the same order
* the promises were provided). An exception is thrown if any of the promises
* are rejected.
*
* @param iterable<PromiseInterface> $promises Iterable of PromiseInterface objects to wait on.
*
* @return array
*
* @throws \Exception on error
* @throws \Throwable on error in PHP >=7
*
* @deprecated unwrap will be removed in guzzlehttp/promises:2.0. Use Utils::unwrap instead.
*/
function unwrap($promises)
{
return Utils::unwrap($promises);
}
/**
* Given an array of promises, return a promise that is fulfilled when all the
* items in the array are fulfilled.
*
* The promise's fulfillment value is an array with fulfillment values at
* respective positions to the original array. If any promise in the array
* rejects, the returned promise is rejected with the rejection reason.
*
* @param mixed $promises Promises or values.
* @param bool $recursive If true, resolves new promises that might have been added to the stack during its own resolution.
*
* @return PromiseInterface
*
* @deprecated all will be removed in guzzlehttp/promises:2.0. Use Utils::all instead.
*/
function all($promises, $recursive = false)
{
return Utils::all($promises, $recursive);
}
/**
* Initiate a competitive race between multiple promises or values (values will
* become immediately fulfilled promises).
*
* When count amount of promises have been fulfilled, the returned promise is
* fulfilled with an array that contains the fulfillment values of the winners
* in order of resolution.
*
* This promise is rejected with a {@see AggregateException} if the number of
* fulfilled promises is less than the desired $count.
*
* @param int $count Total number of promises.
* @param mixed $promises Promises or values.
*
* @return PromiseInterface
*
* @deprecated some will be removed in guzzlehttp/promises:2.0. Use Utils::some instead.
*/
function some($count, $promises)
{
return Utils::some($count, $promises);
}
/**
* Like some(), with 1 as count. However, if the promise fulfills, the
* fulfillment value is not an array of 1 but the value directly.
*
* @param mixed $promises Promises or values.
*
* @return PromiseInterface
*
* @deprecated any will be removed in guzzlehttp/promises:2.0. Use Utils::any instead.
*/
function any($promises)
{
return Utils::any($promises);
}
/**
* Returns a promise that is fulfilled when all of the provided promises have
* been fulfilled or rejected.
*
* The returned promise is fulfilled with an array of inspection state arrays.
*
* @see inspect for the inspection state array format.
*
* @param mixed $promises Promises or values.
*
* @return PromiseInterface
*
* @deprecated settle will be removed in guzzlehttp/promises:2.0. Use Utils::settle instead.
*/
function settle($promises)
{
return Utils::settle($promises);
}
/**
* Given an iterator that yields promises or values, returns a promise that is
* fulfilled with a null value when the iterator has been consumed or the
* aggregate promise has been fulfilled or rejected.
*
* $onFulfilled is a function that accepts the fulfilled value, iterator index,
* and the aggregate promise. The callback can invoke any necessary side
* effects and choose to resolve or reject the aggregate if needed.
*
* $onRejected is a function that accepts the rejection reason, iterator index,
* and the aggregate promise. The callback can invoke any necessary side
* effects and choose to resolve or reject the aggregate if needed.
*
* @param mixed $iterable Iterator or array to iterate over.
* @param callable $onFulfilled
* @param callable $onRejected
*
* @return PromiseInterface
*
* @deprecated each will be removed in guzzlehttp/promises:2.0. Use Each::of instead.
*/
function each(
$iterable,
callable $onFulfilled = null,
callable $onRejected = null
) {
return Each::of($iterable, $onFulfilled, $onRejected);
}
/**
* Like each, but only allows a certain number of outstanding promises at any
* given time.
*
* $concurrency may be an integer or a function that accepts the number of
* pending promises and returns a numeric concurrency limit value to allow for
* dynamic a concurrency size.
*
* @param mixed $iterable
* @param int|callable $concurrency
* @param callable $onFulfilled
* @param callable $onRejected
*
* @return PromiseInterface
*
* @deprecated each_limit will be removed in guzzlehttp/promises:2.0. Use Each::ofLimit instead.
*/
function each_limit(
$iterable,
$concurrency,
callable $onFulfilled = null,
callable $onRejected = null
) {
return Each::ofLimit($iterable, $concurrency, $onFulfilled, $onRejected);
}
/**
* Like each_limit, but ensures that no promise in the given $iterable argument
* is rejected. If any promise is rejected, then the aggregate promise is
* rejected with the encountered rejection.
*
* @param mixed $iterable
* @param int|callable $concurrency
* @param callable $onFulfilled
*
* @return PromiseInterface
*
* @deprecated each_limit_all will be removed in guzzlehttp/promises:2.0. Use Each::ofLimitAll instead.
*/
function each_limit_all(
$iterable,
$concurrency,
callable $onFulfilled = null
) {
return Each::ofLimitAll($iterable, $concurrency, $onFulfilled);
}
/**
* Returns true if a promise is fulfilled.
*
* @return bool
*
* @deprecated is_fulfilled will be removed in guzzlehttp/promises:2.0. Use Is::fulfilled instead.
*/
function is_fulfilled(PromiseInterface $promise)
{
return Is::fulfilled($promise);
}
/**
* Returns true if a promise is rejected.
*
* @return bool
*
* @deprecated is_rejected will be removed in guzzlehttp/promises:2.0. Use Is::rejected instead.
*/
function is_rejected(PromiseInterface $promise)
{
return Is::rejected($promise);
}
/**
* Returns true if a promise is fulfilled or rejected.
*
* @return bool
*
* @deprecated is_settled will be removed in guzzlehttp/promises:2.0. Use Is::settled instead.
*/
function is_settled(PromiseInterface $promise)
{
return Is::settled($promise);
}
/**
* Create a new coroutine.
*
* @see Coroutine
*
* @return PromiseInterface
*
* @deprecated coroutine will be removed in guzzlehttp/promises:2.0. Use Coroutine::of instead.
*/
function coroutine(callable $generatorFn)
{
return Coroutine::of($generatorFn);
}
<?php
// Don't redefine the functions if included multiple times.
if (!function_exists('GuzzleHttp\Promise\promise_for')) {
require __DIR__ . '/functions.php';
}
# Change Log
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
## [Unreleased]
## [1.7.0] - 2020-09-30
### Added
- Replaced functions by static methods
### Fixed
- Converting a non-seekable stream to a string
- Handle multiple Set-Cookie correctly
- Ignore array keys in header values when merging
- Allow multibyte characters to be parsed in `Message:bodySummary()`
### Changed
- Restored partial HHVM 3 support
## [1.6.1] - 2019-07-02
### Fixed
- Accept null and bool header values again
## [1.6.0] - 2019-06-30
### Added
- Allowed version `^3.0` of `ralouphie/getallheaders` dependency (#244)
- Added MIME type for WEBP image format (#246)
- Added more validation of values according to PSR-7 and RFC standards, e.g. status code range (#250, #272)
### Changed
- Tests don't pass with HHVM 4.0, so HHVM support got dropped. Other libraries like composer have done the same. (#262)
- Accept port number 0 to be valid (#270)
### Fixed
- Fixed subsequent reads from `php://input` in ServerRequest (#247)
- Fixed readable/writable detection for certain stream modes (#248)
- Fixed encoding of special characters in the `userInfo` component of an URI (#253)
## [1.5.2] - 2018-12-04
### Fixed
- Check body size when getting the message summary
## [1.5.1] - 2018-12-04
### Fixed
- Get the summary of a body only if it is readable
## [1.5.0] - 2018-12-03
### Added
- Response first-line to response string exception (fixes #145)
- A test for #129 behavior
- `get_message_body_summary` function in order to get the message summary
- `3gp` and `mkv` mime types
### Changed
- Clarify exception message when stream is detached
### Deprecated
- Deprecated parsing folded header lines as per RFC 7230
### Fixed
- Fix `AppendStream::detach` to not close streams
- `InflateStream` preserves `isSeekable` attribute of the underlying stream
- `ServerRequest::getUriFromGlobals` to support URLs in query parameters
Several other fixes and improvements.
## [1.4.2] - 2017-03-20
### Fixed
- Reverted BC break to `Uri::resolve` and `Uri::removeDotSegments` by removing
calls to `trigger_error` when deprecated methods are invoked.
## [1.4.1] - 2017-02-27
### Added
- Rriggering of silenced deprecation warnings.
### Fixed
- Reverted BC break by reintroducing behavior to automagically fix a URI with a
relative path and an authority by adding a leading slash to the path. It's only
deprecated now.
## [1.4.0] - 2017-02-21
### Added
- Added common URI utility methods based on RFC 3986 (see documentation in the readme):
- `Uri::isDefaultPort`
- `Uri::isAbsolute`
- `Uri::isNetworkPathReference`
- `Uri::isAbsolutePathReference`
- `Uri::isRelativePathReference`
- `Uri::isSameDocumentReference`
- `Uri::composeComponents`
- `UriNormalizer::normalize`
- `UriNormalizer::isEquivalent`
- `UriResolver::relativize`
### Changed
- Ensure `ServerRequest::getUriFromGlobals` returns a URI in absolute form.
- Allow `parse_response` to parse a response without delimiting space and reason.
- Ensure each URI modification results in a valid URI according to PSR-7 discussions.
Invalid modifications will throw an exception instead of returning a wrong URI or
doing some magic.
- `(new Uri)->withPath('foo')->withHost('example.com')` will throw an exception
because the path of a URI with an authority must start with a slash "/" or be empty
- `(new Uri())->withScheme('http')` will return `'http://localhost'`
### Deprecated
- `Uri::resolve` in favor of `UriResolver::resolve`
- `Uri::removeDotSegments` in favor of `UriResolver::removeDotSegments`
### Fixed
- `Stream::read` when length parameter <= 0.
- `copy_to_stream` reads bytes in chunks instead of `maxLen` into memory.
- `ServerRequest::getUriFromGlobals` when `Host` header contains port.
- Compatibility of URIs with `file` scheme and empty host.
## [1.3.1] - 2016-06-25
### Fixed
- `Uri::__toString` for network path references, e.g. `//example.org`.
- Missing lowercase normalization for host.
- Handling of URI components in case they are `'0'` in a lot of places,
e.g. as a user info password.
- `Uri::withAddedHeader` to correctly merge headers with different case.
- Trimming of header values in `Uri::withAddedHeader`. Header values may
be surrounded by whitespace which should be ignored according to RFC 7230
Section 3.2.4. This does not apply to header names.
- `Uri::withAddedHeader` with an array of header values.
- `Uri::resolve` when base path has no slash and handling of fragment.
- Handling of encoding in `Uri::with(out)QueryValue` so one can pass the
key/value both in encoded as well as decoded form to those methods. This is
consistent with withPath, withQuery etc.
- `ServerRequest::withoutAttribute` when attribute value is null.
## [1.3.0] - 2016-04-13
### Added
- Remaining interfaces needed for full PSR7 compatibility
(ServerRequestInterface, UploadedFileInterface, etc.).
- Support for stream_for from scalars.
### Changed
- Can now extend Uri.
### Fixed
- A bug in validating request methods by making it more permissive.
## [1.2.3] - 2016-02-18
### Fixed
- Support in `GuzzleHttp\Psr7\CachingStream` for seeking forward on remote
streams, which can sometimes return fewer bytes than requested with `fread`.
- Handling of gzipped responses with FNAME headers.
## [1.2.2] - 2016-01-22
### Added
- Support for URIs without any authority.
- Support for HTTP 451 'Unavailable For Legal Reasons.'
- Support for using '0' as a filename.
- Support for including non-standard ports in Host headers.
## [1.2.1] - 2015-11-02
### Changes
- Now supporting negative offsets when seeking to SEEK_END.
## [1.2.0] - 2015-08-15
### Changed
- Body as `"0"` is now properly added to a response.
- Now allowing forward seeking in CachingStream.
- Now properly parsing HTTP requests that contain proxy targets in
`parse_request`.
- functions.php is now conditionally required.
- user-info is no longer dropped when resolving URIs.
## [1.1.0] - 2015-06-24
### Changed
- URIs can now be relative.
- `multipart/form-data` headers are now overridden case-insensitively.
- URI paths no longer encode the following characters because they are allowed
in URIs: "(", ")", "*", "!", "'"
- A port is no longer added to a URI when the scheme is missing and no port is
present.
## 1.0.0 - 2015-05-19
Initial release.
Currently unsupported:
- `Psr\Http\Message\ServerRequestInterface`
- `Psr\Http\Message\UploadedFileInterface`
[Unreleased]: https://github.com/guzzle/psr7/compare/1.6.0...HEAD
[1.6.0]: https://github.com/guzzle/psr7/compare/1.5.2...1.6.0
[1.5.2]: https://github.com/guzzle/psr7/compare/1.5.1...1.5.2
[1.5.1]: https://github.com/guzzle/psr7/compare/1.5.0...1.5.1
[1.5.0]: https://github.com/guzzle/psr7/compare/1.4.2...1.5.0
[1.4.2]: https://github.com/guzzle/psr7/compare/1.4.1...1.4.2
[1.4.1]: https://github.com/guzzle/psr7/compare/1.4.0...1.4.1
[1.4.0]: https://github.com/guzzle/psr7/compare/1.3.1...1.4.0
[1.3.1]: https://github.com/guzzle/psr7/compare/1.3.0...1.3.1
[1.3.0]: https://github.com/guzzle/psr7/compare/1.2.3...1.3.0
[1.2.3]: https://github.com/guzzle/psr7/compare/1.2.2...1.2.3
[1.2.2]: https://github.com/guzzle/psr7/compare/1.2.1...1.2.2
[1.2.1]: https://github.com/guzzle/psr7/compare/1.2.0...1.2.1
[1.2.0]: https://github.com/guzzle/psr7/compare/1.1.0...1.2.0
[1.1.0]: https://github.com/guzzle/psr7/compare/1.0.0...1.1.0
Copyright (c) 2015 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
# PSR-7 Message Implementation
This repository contains a full [PSR-7](http://www.php-fig.org/psr/psr-7/)
message implementation, several stream decorators, and some helpful
functionality like query string parsing.
[![Build Status](https://travis-ci.org/guzzle/psr7.svg?branch=master)](https://travis-ci.org/guzzle/psr7)
# Stream implementation
This package comes with a number of stream implementations and stream
decorators.
## AppendStream
`GuzzleHttp\Psr7\AppendStream`
Reads from multiple streams, one after the other.
```php
use GuzzleHttp\Psr7;
$a = Psr7\Utils::streamFor('abc, ');
$b = Psr7\Utils::streamFor('123.');
$composed = new Psr7\AppendStream([$a, $b]);
$composed->addStream(Psr7\Utils::streamFor(' Above all listen to me'));
echo $composed; // abc, 123. Above all listen to me.
```
## BufferStream
`GuzzleHttp\Psr7\BufferStream`
Provides a buffer stream that can be written to fill a buffer, and read
from to remove bytes from the buffer.
This stream returns a "hwm" metadata value that tells upstream consumers
what the configured high water mark of the stream is, or the maximum
preferred size of the buffer.
```php
use GuzzleHttp\Psr7;
// When more than 1024 bytes are in the buffer, it will begin returning
// false to writes. This is an indication that writers should slow down.
$buffer = new Psr7\BufferStream(1024);
```
## CachingStream
The CachingStream is used to allow seeking over previously read bytes on
non-seekable streams. This can be useful when transferring a non-seekable
entity body fails due to needing to rewind the stream (for example, resulting
from a redirect). Data that is read from the remote stream will be buffered in
a PHP temp stream so that previously read bytes are cached first in memory,
then on disk.
```php
use GuzzleHttp\Psr7;
$original = Psr7\Utils::streamFor(fopen('http://www.google.com', 'r'));
$stream = new Psr7\CachingStream($original);
$stream->read(1024);
echo $stream->tell();
// 1024
$stream->seek(0);
echo $stream->tell();
// 0
```
## DroppingStream
`GuzzleHttp\Psr7\DroppingStream`
Stream decorator that begins dropping data once the size of the underlying
stream becomes too full.
```php
use GuzzleHttp\Psr7;
// Create an empty stream
$stream = Psr7\Utils::streamFor();
// Start dropping data when the stream has more than 10 bytes
$dropping = new Psr7\DroppingStream($stream, 10);
$dropping->write('01234567890123456789');
echo $stream; // 0123456789
```
## FnStream
`GuzzleHttp\Psr7\FnStream`
Compose stream implementations based on a hash of functions.
Allows for easy testing and extension of a provided stream without needing
to create a concrete class for a simple extension point.
```php
use GuzzleHttp\Psr7;
$stream = Psr7\Utils::streamFor('hi');
$fnStream = Psr7\FnStream::decorate($stream, [
'rewind' => function () use ($stream) {
echo 'About to rewind - ';
$stream->rewind();
echo 'rewound!';
}
]);
$fnStream->rewind();
// Outputs: About to rewind - rewound!
```
## InflateStream
`GuzzleHttp\Psr7\InflateStream`
Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
This stream decorator skips the first 10 bytes of the given stream to remove
the gzip header, converts the provided stream to a PHP stream resource,
then appends the zlib.inflate filter. The stream is then converted back
to a Guzzle stream resource to be used as a Guzzle stream.
## LazyOpenStream
`GuzzleHttp\Psr7\LazyOpenStream`
Lazily reads or writes to a file that is opened only after an IO operation
take place on the stream.
```php
use GuzzleHttp\Psr7;
$stream = new Psr7\LazyOpenStream('/path/to/file', 'r');
// The file has not yet been opened...
echo $stream->read(10);
// The file is opened and read from only when needed.
```
## LimitStream
`GuzzleHttp\Psr7\LimitStream`
LimitStream can be used to read a subset or slice of an existing stream object.
This can be useful for breaking a large file into smaller pieces to be sent in
chunks (e.g. Amazon S3's multipart upload API).
```php
use GuzzleHttp\Psr7;
$original = Psr7\Utils::streamFor(fopen('/tmp/test.txt', 'r+'));
echo $original->getSize();
// >>> 1048576
// Limit the size of the body to 1024 bytes and start reading from byte 2048
$stream = new Psr7\LimitStream($original, 1024, 2048);
echo $stream->getSize();
// >>> 1024
echo $stream->tell();
// >>> 0
```
## MultipartStream
`GuzzleHttp\Psr7\MultipartStream`
Stream that when read returns bytes for a streaming multipart or
multipart/form-data stream.
## NoSeekStream
`GuzzleHttp\Psr7\NoSeekStream`
NoSeekStream wraps a stream and does not allow seeking.
```php
use GuzzleHttp\Psr7;
$original = Psr7\Utils::streamFor('foo');
$noSeek = new Psr7\NoSeekStream($original);
echo $noSeek->read(3);
// foo
var_export($noSeek->isSeekable());
// false
$noSeek->seek(0);
var_export($noSeek->read(3));
// NULL
```
## PumpStream
`GuzzleHttp\Psr7\PumpStream`
Provides a read only stream that pumps data from a PHP callable.
When invoking the provided callable, the PumpStream will pass the amount of
data requested to read to the callable. The callable can choose to ignore
this value and return fewer or more bytes than requested. Any extra data
returned by the provided callable is buffered internally until drained using
the read() function of the PumpStream. The provided callable MUST return
false when there is no more data to read.
## Implementing stream decorators
Creating a stream decorator is very easy thanks to the
`GuzzleHttp\Psr7\StreamDecoratorTrait`. This trait provides methods that
implement `Psr\Http\Message\StreamInterface` by proxying to an underlying
stream. Just `use` the `StreamDecoratorTrait` and implement your custom
methods.
For example, let's say we wanted to call a specific function each time the last
byte is read from a stream. This could be implemented by overriding the
`read()` method.
```php
use Psr\Http\Message\StreamInterface;
use GuzzleHttp\Psr7\StreamDecoratorTrait;
class EofCallbackStream implements StreamInterface
{
use StreamDecoratorTrait;
private $callback;
public function __construct(StreamInterface $stream, callable $cb)
{
$this->stream = $stream;
$this->callback = $cb;
}
public function read($length)
{
$result = $this->stream->read($length);
// Invoke the callback when EOF is hit.
if ($this->eof()) {
call_user_func($this->callback);
}
return $result;
}
}
```
This decorator could be added to any existing stream and used like so:
```php
use GuzzleHttp\Psr7;
$original = Psr7\Utils::streamFor('foo');
$eofStream = new EofCallbackStream($original, function () {
echo 'EOF!';
});
$eofStream->read(2);
$eofStream->read(1);
// echoes "EOF!"
$eofStream->seek(0);
$eofStream->read(3);
// echoes "EOF!"
```
## PHP StreamWrapper
You can use the `GuzzleHttp\Psr7\StreamWrapper` class if you need to use a
PSR-7 stream as a PHP stream resource.
Use the `GuzzleHttp\Psr7\StreamWrapper::getResource()` method to create a PHP
stream from a PSR-7 stream.
```php
use GuzzleHttp\Psr7\StreamWrapper;
$stream = GuzzleHttp\Psr7\Utils::streamFor('hello!');
$resource = StreamWrapper::getResource($stream);
echo fread($resource, 6); // outputs hello!
```
# Static API
There are various static methods available under the `GuzzleHttp\Psr7` namespace.
## `GuzzleHttp\Psr7\Message::toString`
`public static function toString(MessageInterface $message): string`
Returns the string representation of an HTTP message.
```php
$request = new GuzzleHttp\Psr7\Request('GET', 'http://example.com');
echo GuzzleHttp\Psr7\Message::toString($request);
```
## `GuzzleHttp\Psr7\Message::bodySummary`
`public static function bodySummary(MessageInterface $message, int $truncateAt = 120): string|null`
Get a short summary of the message body.
Will return `null` if the response is not printable.
## `GuzzleHttp\Psr7\Message::rewindBody`
`public static function rewindBody(MessageInterface $message): void`
Attempts to rewind a message body and throws an exception on failure.
The body of the message will only be rewound if a call to `tell()`
returns a value other than `0`.
## `GuzzleHttp\Psr7\Message::parseMessage`
`public static function parseMessage(string $message): array`
Parses an HTTP message into an associative array.
The array contains the "start-line" key containing the start line of
the message, "headers" key containing an associative array of header
array values, and a "body" key containing the body of the message.
## `GuzzleHttp\Psr7\Message::parseRequestUri`
`public static function parseRequestUri(string $path, array $headers): string`
Constructs a URI for an HTTP request message.
## `GuzzleHttp\Psr7\Message::parseRequest`
`public static function parseRequest(string $message): Request`
Parses a request message string into a request object.
## `GuzzleHttp\Psr7\Message::parseResponse`
`public static function parseResponse(string $message): Response`
Parses a response message string into a response object.
## `GuzzleHttp\Psr7\Header::parse`
`public static function parse(string|array $header): array`
Parse an array of header values containing ";" separated data into an
array of associative arrays representing the header key value pair data
of the header. When a parameter does not contain a value, but just
contains a key, this function will inject a key with a '' string value.
## `GuzzleHttp\Psr7\Header::normalize`
`public static function normalize(string|array $header): array`
Converts an array of header values that may contain comma separated
headers into an array of headers with no comma separated values.
## `GuzzleHttp\Psr7\Query::parse`
`public static function parse(string $str, int|bool $urlEncoding = true): array`
Parse a query string into an associative array.
If multiple values are found for the same key, the value of that key
value pair will become an array. This function does not parse nested
PHP style arrays into an associative array (e.g., `foo[a]=1&foo[b]=2`
will be parsed into `['foo[a]' => '1', 'foo[b]' => '2'])`.
## `GuzzleHttp\Psr7\Query::build`
`public static function build(array $params, int|false $encoding = PHP_QUERY_RFC3986): string`
Build a query string from an array of key value pairs.
This function can use the return value of `parse()` to build a query
string. This function does not modify the provided keys when an array is
encountered (like `http_build_query()` would).
## `GuzzleHttp\Psr7\Utils::caselessRemove`
`public static function caselessRemove(iterable<string> $keys, $keys, array $data): array`
Remove the items given by the keys, case insensitively from the data.
## `GuzzleHttp\Psr7\Utils::copyToStream`
`public static function copyToStream(StreamInterface $source, StreamInterface $dest, int $maxLen = -1): void`
Copy the contents of a stream into another stream until the given number
of bytes have been read.
## `GuzzleHttp\Psr7\Utils::copyToString`
`public static function copyToString(StreamInterface $stream, int $maxLen = -1): string`
Copy the contents of a stream into a string until the given number of
bytes have been read.
## `GuzzleHttp\Psr7\Utils::hash`
`public static function hash(StreamInterface $stream, string $algo, bool $rawOutput = false): string`
Calculate a hash of a stream.
This method reads the entire stream to calculate a rolling hash, based on
PHP's `hash_init` functions.
## `GuzzleHttp\Psr7\Utils::modifyRequest`
`public static function modifyRequest(RequestInterface $request, array $changes): RequestInterface`
Clone and modify a request with the given changes.
This method is useful for reducing the number of clones needed to mutate
a message.
- method: (string) Changes the HTTP method.
- set_headers: (array) Sets the given headers.
- remove_headers: (array) Remove the given headers.
- body: (mixed) Sets the given body.
- uri: (UriInterface) Set the URI.
- query: (string) Set the query string value of the URI.
- version: (string) Set the protocol version.
## `GuzzleHttp\Psr7\Utils::readLine`
`public static function readLine(StreamInterface $stream, int $maxLength = null): string`
Read a line from the stream up to the maximum allowed buffer length.
## `GuzzleHttp\Psr7\Utils::streamFor`
`public static function streamFor(resource|string|null|int|float|bool|StreamInterface|callable|\Iterator $resource = '', array $options = []): StreamInterface`
Create a new stream based on the input type.
Options is an associative array that can contain the following keys:
- metadata: Array of custom metadata.
- size: Size of the stream.
This method accepts the following `$resource` types:
- `Psr\Http\Message\StreamInterface`: Returns the value as-is.
- `string`: Creates a stream object that uses the given string as the contents.
- `resource`: Creates a stream object that wraps the given PHP stream resource.
- `Iterator`: If the provided value implements `Iterator`, then a read-only
stream object will be created that wraps the given iterable. Each time the
stream is read from, data from the iterator will fill a buffer and will be
continuously called until the buffer is equal to the requested read size.
Subsequent read calls will first read from the buffer and then call `next`
on the underlying iterator until it is exhausted.
- `object` with `__toString()`: If the object has the `__toString()` method,
the object will be cast to a string and then a stream will be returned that
uses the string value.
- `NULL`: When `null` is passed, an empty stream object is returned.
- `callable` When a callable is passed, a read-only stream object will be
created that invokes the given callable. The callable is invoked with the
number of suggested bytes to read. The callable can return any number of
bytes, but MUST return `false` when there is no more data to return. The
stream object that wraps the callable will invoke the callable until the
number of requested bytes are available. Any additional bytes will be
buffered and used in subsequent reads.
```php
$stream = GuzzleHttp\Psr7\Utils::streamFor('foo');
$stream = GuzzleHttp\Psr7\Utils::streamFor(fopen('/path/to/file', 'r'));
$generator = function ($bytes) {
for ($i = 0; $i < $bytes; $i++) {
yield ' ';
}
}
$stream = GuzzleHttp\Psr7\Utils::streamFor($generator(100));
```
## `GuzzleHttp\Psr7\Utils::tryFopen`
`public static function tryFopen(string $filename, string $mode): resource`
Safely opens a PHP stream resource using a filename.
When fopen fails, PHP normally raises a warning. This function adds an
error handler that checks for errors and throws an exception instead.
## `GuzzleHttp\Psr7\Utils::uriFor`
`public static function uriFor(string|UriInterface $uri): UriInterface`
Returns a UriInterface for the given value.
This function accepts a string or UriInterface and returns a
UriInterface for the given value. If the value is already a
UriInterface, it is returned as-is.
## `GuzzleHttp\Psr7\MimeType::fromFilename`
`public static function fromFilename(string $filename): string|null`
Determines the mimetype of a file by looking at its extension.
## `GuzzleHttp\Psr7\MimeType::fromExtension`
`public static function fromExtension(string $extension): string|null`
Maps a file extensions to a mimetype.
## Upgrading from Function API
The static API was first introduced in 1.7.0, in order to mitigate problems with functions conflicting between global and local copies of the package. The function API will be removed in 2.0.0. A migration table has been provided here for your convenience:
| Original Function | Replacement Method |
|----------------|----------------|
| `str` | `Message::toString` |
| `uri_for` | `Utils::uriFor` |
| `stream_for` | `Utils::streamFor` |
| `parse_header` | `Header::parse` |
| `normalize_header` | `Header::normalize` |
| `modify_request` | `Utils::modifyRequest` |
| `rewind_body` | `Message::rewindBody` |
| `try_fopen` | `Utils::tryFopen` |
| `copy_to_string` | `Utils::copyToString` |
| `copy_to_stream` | `Utils::copyToStream` |
| `hash` | `Utils::hash` |
| `readline` | `Utils::readLine` |
| `parse_request` | `Message::parseRequest` |
| `parse_response` | `Message::parseResponse` |
| `parse_query` | `Query::parse` |
| `build_query` | `Query::build` |
| `mimetype_from_filename` | `MimeType::fromFilename` |
| `mimetype_from_extension` | `MimeType::fromExtension` |
| `_parse_message` | `Message::parseMessage` |
| `_parse_request_uri` | `Message::parseRequestUri` |
| `get_message_body_summary` | `Message::bodySummary` |
| `_caseless_remove` | `Utils::caselessRemove` |
# Additional URI Methods
Aside from the standard `Psr\Http\Message\UriInterface` implementation in form of the `GuzzleHttp\Psr7\Uri` class,
this library also provides additional functionality when working with URIs as static methods.
## URI Types
An instance of `Psr\Http\Message\UriInterface` can either be an absolute URI or a relative reference.
An absolute URI has a scheme. A relative reference is used to express a URI relative to another URI,
the base URI. Relative references can be divided into several forms according to
[RFC 3986 Section 4.2](https://tools.ietf.org/html/rfc3986#section-4.2):
- network-path references, e.g. `//example.com/path`
- absolute-path references, e.g. `/path`
- relative-path references, e.g. `subpath`
The following methods can be used to identify the type of the URI.
### `GuzzleHttp\Psr7\Uri::isAbsolute`
`public static function isAbsolute(UriInterface $uri): bool`
Whether the URI is absolute, i.e. it has a scheme.
### `GuzzleHttp\Psr7\Uri::isNetworkPathReference`
`public static function isNetworkPathReference(UriInterface $uri): bool`
Whether the URI is a network-path reference. A relative reference that begins with two slash characters is
termed an network-path reference.
### `GuzzleHttp\Psr7\Uri::isAbsolutePathReference`
`public static function isAbsolutePathReference(UriInterface $uri): bool`
Whether the URI is a absolute-path reference. A relative reference that begins with a single slash character is
termed an absolute-path reference.
### `GuzzleHttp\Psr7\Uri::isRelativePathReference`
`public static function isRelativePathReference(UriInterface $uri): bool`
Whether the URI is a relative-path reference. A relative reference that does not begin with a slash character is
termed a relative-path reference.
### `GuzzleHttp\Psr7\Uri::isSameDocumentReference`
`public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null): bool`
Whether the URI is a same-document reference. A same-document reference refers to a URI that is, aside from its
fragment component, identical to the base URI. When no base URI is given, only an empty URI reference
(apart from its fragment) is considered a same-document reference.
## URI Components
Additional methods to work with URI components.
### `GuzzleHttp\Psr7\Uri::isDefaultPort`
`public static function isDefaultPort(UriInterface $uri): bool`
Whether the URI has the default port of the current scheme. `Psr\Http\Message\UriInterface::getPort` may return null
or the standard port. This method can be used independently of the implementation.
### `GuzzleHttp\Psr7\Uri::composeComponents`
`public static function composeComponents($scheme, $authority, $path, $query, $fragment): string`
Composes a URI reference string from its various components according to
[RFC 3986 Section 5.3](https://tools.ietf.org/html/rfc3986#section-5.3). Usually this method does not need to be called
manually but instead is used indirectly via `Psr\Http\Message\UriInterface::__toString`.
### `GuzzleHttp\Psr7\Uri::fromParts`
`public static function fromParts(array $parts): UriInterface`
Creates a URI from a hash of [`parse_url`](http://php.net/manual/en/function.parse-url.php) components.
### `GuzzleHttp\Psr7\Uri::withQueryValue`
`public static function withQueryValue(UriInterface $uri, $key, $value): UriInterface`
Creates a new URI with a specific query string value. Any existing query string values that exactly match the
provided key are removed and replaced with the given key value pair. A value of null will set the query string
key without a value, e.g. "key" instead of "key=value".
### `GuzzleHttp\Psr7\Uri::withQueryValues`
`public static function withQueryValues(UriInterface $uri, array $keyValueArray): UriInterface`
Creates a new URI with multiple query string values. It has the same behavior as `withQueryValue()` but for an
associative array of key => value.
### `GuzzleHttp\Psr7\Uri::withoutQueryValue`
`public static function withoutQueryValue(UriInterface $uri, $key): UriInterface`
Creates a new URI with a specific query string value removed. Any existing query string values that exactly match the
provided key are removed.
## Reference Resolution
`GuzzleHttp\Psr7\UriResolver` provides methods to resolve a URI reference in the context of a base URI according
to [RFC 3986 Section 5](https://tools.ietf.org/html/rfc3986#section-5). This is for example also what web browsers
do when resolving a link in a website based on the current request URI.
### `GuzzleHttp\Psr7\UriResolver::resolve`
`public static function resolve(UriInterface $base, UriInterface $rel): UriInterface`
Converts the relative URI into a new URI that is resolved against the base URI.
### `GuzzleHttp\Psr7\UriResolver::removeDotSegments`
`public static function removeDotSegments(string $path): string`
Removes dot segments from a path and returns the new path according to
[RFC 3986 Section 5.2.4](https://tools.ietf.org/html/rfc3986#section-5.2.4).
### `GuzzleHttp\Psr7\UriResolver::relativize`
`public static function relativize(UriInterface $base, UriInterface $target): UriInterface`
Returns the target URI as a relative reference from the base URI. This method is the counterpart to resolve():
```php
(string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
```
One use-case is to use the current request URI as base URI and then generate relative links in your documents
to reduce the document size or offer self-contained downloadable document archives.
```php
$base = new Uri('http://example.com/a/b/');
echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c')); // prints 'c'.
echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y')); // prints '../x/y'.
echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
echo UriResolver::relativize($base, new Uri('http://example.org/a/b/')); // prints '//example.org/a/b/'.
```
## Normalization and Comparison
`GuzzleHttp\Psr7\UriNormalizer` provides methods to normalize and compare URIs according to
[RFC 3986 Section 6](https://tools.ietf.org/html/rfc3986#section-6).
### `GuzzleHttp\Psr7\UriNormalizer::normalize`
`public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS): UriInterface`
Returns a normalized URI. The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
This methods adds additional normalizations that can be configured with the `$flags` parameter which is a bitmask
of normalizations to apply. The following normalizations are available:
- `UriNormalizer::PRESERVING_NORMALIZATIONS`
Default normalizations which only include the ones that preserve semantics.
- `UriNormalizer::CAPITALIZE_PERCENT_ENCODING`
All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
Example: `http://example.org/a%c2%b1b` → `http://example.org/a%C2%B1b`
- `UriNormalizer::DECODE_UNRESERVED_CHARACTERS`
Decodes percent-encoded octets of unreserved characters. For consistency, percent-encoded octets in the ranges of
ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39), hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should
not be created by URI producers and, when found in a URI, should be decoded to their corresponding unreserved
characters by URI normalizers.
Example: `http://example.org/%7Eusern%61me/` → `http://example.org/~username/`
- `UriNormalizer::CONVERT_EMPTY_PATH`
Converts the empty path to "/" for http and https URIs.
Example: `http://example.org` → `http://example.org/`
- `UriNormalizer::REMOVE_DEFAULT_HOST`
Removes the default host of the given URI scheme from the URI. Only the "file" scheme defines the default host
"localhost". All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile` are equivalent according to
RFC 3986.
Example: `file://localhost/myfile` → `file:///myfile`
- `UriNormalizer::REMOVE_DEFAULT_PORT`
Removes the default port of the given URI scheme from the URI.
Example: `http://example.org:80/` → `http://example.org/`
- `UriNormalizer::REMOVE_DOT_SEGMENTS`
Removes unnecessary dot-segments. Dot-segments in relative-path references are not removed as it would
change the semantics of the URI reference.
Example: `http://example.org/../a/b/../c/./d.html` → `http://example.org/a/c/d.html`
- `UriNormalizer::REMOVE_DUPLICATE_SLASHES`
Paths which include two or more adjacent slashes are converted to one. Webservers usually ignore duplicate slashes
and treat those URIs equivalent. But in theory those URIs do not need to be equivalent. So this normalization
may change the semantics. Encoded slashes (%2F) are not removed.
Example: `http://example.org//foo///bar.html` → `http://example.org/foo/bar.html`
- `UriNormalizer::SORT_QUERY_PARAMETERS`
Sort query parameters with their values in alphabetical order. However, the order of parameters in a URI may be
significant (this is not defined by the standard). So this normalization is not safe and may change the semantics
of the URI.
Example: `?lang=en&article=fred` → `?article=fred&lang=en`
### `GuzzleHttp\Psr7\UriNormalizer::isEquivalent`
`public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS): bool`
Whether two URIs can be considered equivalent. Both URIs are normalized automatically before comparison with the given
`$normalizations` bitmask. The method also accepts relative URI references and returns true when they are equivalent.
This of course assumes they will be resolved against the same base URI. If this is not the case, determination of
equivalence or difference of relative references does not mean anything.
{
"name": "guzzlehttp/psr7",
"type": "library",
"description": "PSR-7 message implementation that also provides common utility methods",
"keywords": ["request", "response", "message", "stream", "http", "uri", "url", "psr-7"],
"license": "MIT",
"authors": [
{
"name": "Michael Dowling",
"email": "mtdowling@gmail.com",
"homepage": "https://github.com/mtdowling"
},
{
"name": "Tobias Schultze",
"homepage": "https://github.com/Tobion"
}
],
"require": {
"php": ">=5.4.0",
"psr/http-message": "~1.0",
"ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
},
"require-dev": {
"phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.10",
"ext-zlib": "*"
},
"provide": {
"psr/http-message-implementation": "1.0"
},
"suggest": {
"laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
},
"autoload": {
"psr-4": {
"GuzzleHttp\\Psr7\\": "src/"
},
"files": ["src/functions_include.php"]
},
"autoload-dev": {
"psr-4": {
"GuzzleHttp\\Tests\\Psr7\\": "tests/"
}
},
"extra": {
"branch-alias": {
"dev-master": "1.7-dev"
}
}
}
<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Reads from multiple streams, one after the other.
*
* This is a read-only stream decorator.
*/
class AppendStream implements StreamInterface
{
/** @var StreamInterface[] Streams being decorated */
private $streams = [];
private $seekable = true;
private $current = 0;
private $pos = 0;
/**
* @param StreamInterface[] $streams Streams to decorate. Each stream must
* be readable.
*/
public function __construct(array $streams = [])
{
foreach ($streams as $stream) {
$this->addStream($stream);
}
}
public function __toString()
{
try {
$this->rewind();
return $this->getContents();
} catch (\Exception $e) {
return '';
}
}
/**
* Add a stream to the AppendStream
*
* @param StreamInterface $stream Stream to append. Must be readable.
*
* @throws \InvalidArgumentException if the stream is not readable
*/
public function addStream(StreamInterface $stream)
{
if (!$stream->isReadable()) {
throw new \InvalidArgumentException('Each stream must be readable');
}
// The stream is only seekable if all streams are seekable
if (!$stream->isSeekable()) {
$this->seekable = false;
}
$this->streams[] = $stream;
}
public function getContents()
{
return Utils::copyToString($this);
}
/**
* Closes each attached stream.
*
* {@inheritdoc}
*/
public function close()
{
$this->pos = $this->current = 0;
$this->seekable = true;
foreach ($this->streams as $stream) {
$stream->close();
}
$this->streams = [];
}
/**
* Detaches each attached stream.
*
* Returns null as it's not clear which underlying stream resource to return.
*
* {@inheritdoc}
*/
public function detach()
{
$this->pos = $this->current = 0;
$this->seekable = true;
foreach ($this->streams as $stream) {
$stream->detach();
}
$this->streams = [];
return null;
}
public function tell()
{
return $this->pos;
}
/**
* Tries to calculate the size by adding the size of each stream.
*
* If any of the streams do not return a valid number, then the size of the
* append stream cannot be determined and null is returned.
*
* {@inheritdoc}
*/
public function getSize()
{
$size = 0;
foreach ($this->streams as $stream) {
$s = $stream->getSize();
if ($s === null) {
return null;
}
$size += $s;
}
return $size;
}
public function eof()
{
return !$this->streams ||
($this->current >= count($this->streams) - 1 &&
$this->streams[$this->current]->eof());
}
public function rewind()
{
$this->seek(0);
}
/**
* Attempts to seek to the given position. Only supports SEEK_SET.
*
* {@inheritdoc}
*/
public function seek($offset, $whence = SEEK_SET)
{
if (!$this->seekable) {
throw new \RuntimeException('This AppendStream is not seekable');
} elseif ($whence !== SEEK_SET) {
throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
}
$this->pos = $this->current = 0;
// Rewind each stream
foreach ($this->streams as $i => $stream) {
try {
$stream->rewind();
} catch (\Exception $e) {
throw new \RuntimeException('Unable to seek stream '
. $i . ' of the AppendStream', 0, $e);
}
}
// Seek to the actual position by reading from each stream
while ($this->pos < $offset && !$this->eof()) {
$result = $this->read(min(8096, $offset - $this->pos));
if ($result === '') {
break;
}
}
}
/**
* Reads from all of the appended streams until the length is met or EOF.
*
* {@inheritdoc}
*/
public function read($length)
{
$buffer = '';
$total = count($this->streams) - 1;
$remaining = $length;
$progressToNext = false;
while ($remaining > 0) {
// Progress to the next stream if needed.
if ($progressToNext || $this->streams[$this->current]->eof()) {
$progressToNext = false;
if ($this->current === $total) {
break;
}
$this->current++;
}
$result = $this->streams[$this->current]->read($remaining);
// Using a loose comparison here to match on '', false, and null
if ($result == null) {
$progressToNext = true;
continue;
}
$buffer .= $result;
$remaining = $length - strlen($buffer);
}
$this->pos += strlen($buffer);
return $buffer;
}
public function isReadable()
{
return true;
}
public function isWritable()
{
return false;
}
public function isSeekable()
{
return $this->seekable;
}
public function write($string)
{
throw new \RuntimeException('Cannot write to an AppendStream');
}
public function getMetadata($key = null)
{
return $key ? null : [];
}
}
<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Provides a buffer stream that can be written to to fill a buffer, and read
* from to remove bytes from the buffer.
*
* This stream returns a "hwm" metadata value that tells upstream consumers
* what the configured high water mark of the stream is, or the maximum
* preferred size of the buffer.
*/
class BufferStream implements StreamInterface
{
private $hwm;
private $buffer = '';
/**
* @param int $hwm High water mark, representing the preferred maximum
* buffer size. If the size of the buffer exceeds the high
* water mark, then calls to write will continue to succeed
* but will return false to inform writers to slow down
* until the buffer has been drained by reading from it.
*/
public function __construct($hwm = 16384)
{
$this->hwm = $hwm;
}
public function __toString()
{
return $this->getContents();
}
public function getContents()
{
$buffer = $this->buffer;
$this->buffer = '';
return $buffer;
}
public function close()
{
$this->buffer = '';
}
public function detach()
{
$this->close();
return null;
}
public function getSize()
{
return strlen($this->buffer);
}
public function isReadable()
{
return true;
}
public function isWritable()
{
return true;
}
public function isSeekable()
{
return false;
}
public function rewind()
{
$this->seek(0);
}
public function seek($offset, $whence = SEEK_SET)
{
throw new \RuntimeException('Cannot seek a BufferStream');
}
public function eof()
{
return strlen($this->buffer) === 0;
}
public function tell()
{
throw new \RuntimeException('Cannot determine the position of a BufferStream');
}
/**
* Reads data from the buffer.
*/
public function read($length)
{
$currentLength = strlen($this->buffer);
if ($length >= $currentLength) {
// No need to slice the buffer because we don't have enough data.
$result = $this->buffer;
$this->buffer = '';
} else {
// Slice up the result to provide a subset of the buffer.
$result = substr($this->buffer, 0, $length);
$this->buffer = substr($this->buffer, $length);
}
return $result;
}
/**
* Writes data to the buffer.
*/
public function write($string)
{
$this->buffer .= $string;
// TODO: What should happen here?
if (strlen($this->buffer) >= $this->hwm) {
return false;
}
return strlen($string);
}
public function getMetadata($key = null)
{
if ($key == 'hwm') {
return $this->hwm;
}
return $key ? null : [];
}
}
<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Stream decorator that can cache previously read bytes from a sequentially
* read stream.
*/
class CachingStream implements StreamInterface
{
use StreamDecoratorTrait;
/** @var StreamInterface Stream being wrapped */
private $remoteStream;
/** @var int Number of bytes to skip reading due to a write on the buffer */
private $skipReadBytes = 0;
/**
* We will treat the buffer object as the body of the stream
*
* @param StreamInterface $stream Stream to cache
* @param StreamInterface $target Optionally specify where data is cached
*/
public function __construct(
StreamInterface $stream,
StreamInterface $target = null
) {
$this->remoteStream = $stream;
$this->stream = $target ?: new Stream(fopen('php://temp', 'r+'));
}
public function getSize()
{
return max($this->stream->getSize(), $this->remoteStream->getSize());
}
public function rewind()
{
$this->seek(0);
}
public function seek($offset, $whence = SEEK_SET)
{
if ($whence == SEEK_SET) {
$byte = $offset;
} elseif ($whence == SEEK_CUR) {
$byte = $offset + $this->tell();
} elseif ($whence == SEEK_END) {
$size = $this->remoteStream->getSize();
if ($size === null) {
$size = $this->cacheEntireStream();
}
$byte = $size + $offset;
} else {
throw new \InvalidArgumentException('Invalid whence');
}
$diff = $byte - $this->stream->getSize();
if ($diff > 0) {
// Read the remoteStream until we have read in at least the amount
// of bytes requested, or we reach the end of the file.
while ($diff > 0 && !$this->remoteStream->eof()) {
$this->read($diff);
$diff = $byte - $this->stream->getSize();
}
} else {
// We can just do a normal seek since we've already seen this byte.
$this->stream->seek($byte);
}
}
public function read($length)
{
// Perform a regular read on any previously read data from the buffer
$data = $this->stream->read($length);
$remaining = $length - strlen($data);
// More data was requested so read from the remote stream
if ($remaining) {
// If data was written to the buffer in a position that would have
// been filled from the remote stream, then we must skip bytes on
// the remote stream to emulate overwriting bytes from that
// position. This mimics the behavior of other PHP stream wrappers.
$remoteData = $this->remoteStream->read(
$remaining + $this->skipReadBytes
);
if ($this->skipReadBytes) {
$len = strlen($remoteData);
$remoteData = substr($remoteData, $this->skipReadBytes);
$this->skipReadBytes = max(0, $this->skipReadBytes - $len);
}
$data .= $remoteData;
$this->stream->write($remoteData);
}
return $data;
}
public function write($string)
{
// When appending to the end of the currently read stream, you'll want
// to skip bytes from being read from the remote stream to emulate
// other stream wrappers. Basically replacing bytes of data of a fixed
// length.
$overflow = (strlen($string) + $this->tell()) - $this->remoteStream->tell();
if ($overflow > 0) {
$this->skipReadBytes += $overflow;
}
return $this->stream->write($string);
}
public function eof()
{
return $this->stream->eof() && $this->remoteStream->eof();
}
/**
* Close both the remote stream and buffer stream
*/
public function close()
{
$this->remoteStream->close() && $this->stream->close();
}
private function cacheEntireStream()
{
$target = new FnStream(['write' => 'strlen']);
Utils::copyToStream($this, $target);
return $this->tell();
}
}
<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Stream decorator that begins dropping data once the size of the underlying
* stream becomes too full.
*/
class DroppingStream implements StreamInterface
{
use StreamDecoratorTrait;
private $maxLength;
/**
* @param StreamInterface $stream Underlying stream to decorate.
* @param int $maxLength Maximum size before dropping data.
*/
public function __construct(StreamInterface $stream, $maxLength)
{
$this->stream = $stream;
$this->maxLength = $maxLength;
}
public function write($string)
{
$diff = $this->maxLength - $this->stream->getSize();
// Begin returning 0 when the underlying stream is too large.
if ($diff <= 0) {
return 0;
}
// Write the stream or a subset of the stream if needed.
if (strlen($string) < $diff) {
return $this->stream->write($string);
}
return $this->stream->write(substr($string, 0, $diff));
}
}
<?php
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Compose stream implementations based on a hash of functions.
*
* Allows for easy testing and extension of a provided stream without needing
* to create a concrete class for a simple extension point.
*/
class FnStream implements StreamInterface
{
/** @var array */
private $methods;
/** @var array Methods that must be implemented in the given array */
private static $slots = ['__toString', 'close', 'detach', 'rewind',
'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
'isReadable', 'read', 'getContents', 'getMetadata'];
/**
* @param array $methods Hash of method name to a callable.
*/
public function __construct(array $methods)
{
$this->methods = $methods;
// Create the functions on the class
foreach ($methods as $name => $fn) {
$this->{'_fn_' . $name} = $fn;
}
}
/**
* Lazily determine which methods are not implemented.
*
* @throws \BadMethodCallException
*/
public function __get($name)
{
throw new \BadMethodCallException(str_replace('_fn_', '', $name)
. '() is not implemented in the FnStream');
}
/**
* The close method is called on the underlying stream only if possible.
*/
public function __destruct()
{
if (isset($this->_fn_close)) {
call_user_func($this->_fn_close);
}
}
/**
* An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
* @throws \LogicException
*/
public function __wakeup()
{
throw new \LogicException('FnStream should never be unserialized');
}
/**
* Adds custom functionality to an underlying stream by intercepting
* specific method calls.
*
* @param StreamInterface $stream Stream to decorate
* @param array $methods Hash of method name to a closure
*
* @return FnStream
*/
public static function decorate(StreamInterface $stream, array $methods)
{
// If any of the required methods were not provided, then simply
// proxy to the decorated stream.
foreach (array_diff(self::$slots, array_keys($methods)) as $diff) {
$methods[$diff] = [$stream, $diff];
}
return new self($methods);
}
public function __toString()
{
return call_user_func($this->_fn___toString);
}
public function close()
{
return call_user_func($this->_fn_close);
}
public function detach()
{
return call_user_func($this->_fn_detach);
}
public function getSize()
{
return call_user_func($this->_fn_getSize);
}
public function tell()
{
return call_user_func($this->_fn_tell);
}
public function eof()
{
return call_user_func($this->_fn_eof);
}
public function isSeekable()
{
return call_user_func($this->_fn_isSeekable);
}
public function rewind()
{
call_user_func($this->_fn_rewind);
}
public function seek($offset, $whence = SEEK_SET)
{
call_user_func($this->_fn_seek, $offset, $whence);
}
public function isWritable()
{
return call_user_func($this->_fn_isWritable);
}
public function write($string)
{
return call_user_func($this->_fn_write, $string);
}
public function isReadable()
{
return call_user_func($this->_fn_isReadable);
}
public function read($length)
{
return call_user_func($this->_fn_read, $length);
}
public function getContents()
{
return call_user_func($this->_fn_getContents);
}
public function getMetadata($key = null)
{
return call_user_func($this->_fn_getMetadata, $key);
}
}