373 lines
13 KiB
PHP
373 lines
13 KiB
PHP
<?php
|
|
namespace Aws;
|
|
|
|
use Aws\Api\Service;
|
|
use Aws\Api\Validator;
|
|
use Aws\Credentials\CredentialsInterface;
|
|
use Aws\Exception\AwsException;
|
|
use GuzzleHttp\Promise;
|
|
use GuzzleHttp\Psr7;
|
|
use GuzzleHttp\Psr7\LazyOpenStream;
|
|
use Psr\Http\Message\RequestInterface;
|
|
|
|
final class Middleware
|
|
{
|
|
/**
|
|
* Middleware used to allow a command parameter (e.g., "SourceFile") to
|
|
* be used to specify the source of data for an upload operation.
|
|
*
|
|
* @param Service $api
|
|
* @param string $bodyParameter
|
|
* @param string $sourceParameter
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function sourceFile(
|
|
Service $api,
|
|
$bodyParameter = 'Body',
|
|
$sourceParameter = 'SourceFile'
|
|
) {
|
|
return function (callable $handler) use (
|
|
$api,
|
|
$bodyParameter,
|
|
$sourceParameter
|
|
) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null)
|
|
use (
|
|
$handler,
|
|
$api,
|
|
$bodyParameter,
|
|
$sourceParameter
|
|
) {
|
|
$operation = $api->getOperation($command->getName());
|
|
$source = $command[$sourceParameter];
|
|
|
|
if ($source !== null
|
|
&& $operation->getInput()->hasMember($bodyParameter)
|
|
) {
|
|
$command[$bodyParameter] = new LazyOpenStream($source, 'r');
|
|
unset($command[$sourceParameter]);
|
|
}
|
|
|
|
return $handler($command, $request);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Adds a middleware that uses client-side validation.
|
|
*
|
|
* @param Service $api API being accessed.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function validation(Service $api, Validator $validator = null)
|
|
{
|
|
$validator = $validator ?: new Validator();
|
|
return function (callable $handler) use ($api, $validator) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($api, $validator, $handler) {
|
|
$operation = $api->getOperation($command->getName());
|
|
$validator->validate(
|
|
$command->getName(),
|
|
$operation->getInput(),
|
|
$command->toArray()
|
|
);
|
|
return $handler($command, $request);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Builds an HTTP request for a command.
|
|
*
|
|
* @param callable $serializer Function used to serialize a request for a
|
|
* command.
|
|
* @return callable
|
|
*/
|
|
public static function requestBuilder(callable $serializer)
|
|
{
|
|
return function (callable $handler) use ($serializer) {
|
|
return function (CommandInterface $command) use ($serializer, $handler) {
|
|
return $handler($command, $serializer($command));
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a middleware that signs requests for a command.
|
|
*
|
|
* @param callable $credProvider Credentials provider function that
|
|
* returns a promise that is resolved
|
|
* with a CredentialsInterface object.
|
|
* @param callable $signatureFunction Function that accepts a Command
|
|
* object and returns a
|
|
* SignatureInterface.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function signer(callable $credProvider, callable $signatureFunction)
|
|
{
|
|
return function (callable $handler) use ($signatureFunction, $credProvider) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request
|
|
) use ($handler, $signatureFunction, $credProvider) {
|
|
$signer = $signatureFunction($command);
|
|
return $credProvider()->then(
|
|
function (CredentialsInterface $creds)
|
|
use ($handler, $command, $signer, $request) {
|
|
return $handler(
|
|
$command,
|
|
$signer->signRequest($request, $creds)
|
|
);
|
|
}
|
|
);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a middleware that invokes a callback at a given step.
|
|
*
|
|
* The tap callback accepts a CommandInterface and RequestInterface as
|
|
* arguments but is not expected to return a new value or proxy to
|
|
* downstream middleware. It's simply a way to "tap" into the handler chain
|
|
* to debug or get an intermediate value.
|
|
*
|
|
* @param callable $fn Tap function
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function tap(callable $fn)
|
|
{
|
|
return function (callable $handler) use ($fn) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler, $fn) {
|
|
$fn($command, $request);
|
|
return $handler($command, $request);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Middleware wrapper function that retries requests based on the boolean
|
|
* result of invoking the provided "decider" function.
|
|
*
|
|
* If no delay function is provided, a simple implementation of exponential
|
|
* backoff will be utilized.
|
|
*
|
|
* @param callable $decider Function that accepts the number of retries,
|
|
* a request, [result], and [exception] and
|
|
* returns true if the command is to be retried.
|
|
* @param callable $delay Function that accepts the number of retries and
|
|
* returns the number of milliseconds to delay.
|
|
* @param bool $stats Whether to collect statistics on retries and the
|
|
* associated delay.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function retry(
|
|
callable $decider = null,
|
|
callable $delay = null,
|
|
$stats = false
|
|
) {
|
|
$decider = $decider ?: RetryMiddleware::createDefaultDecider();
|
|
$delay = $delay ?: [RetryMiddleware::class, 'exponentialDelay'];
|
|
|
|
return function (callable $handler) use ($decider, $delay, $stats) {
|
|
return new RetryMiddleware($decider, $delay, $handler, $stats);
|
|
};
|
|
}
|
|
/**
|
|
* Middleware wrapper function that adds an invocation id header to
|
|
* requests, which is only applied after the build step.
|
|
*
|
|
* This is a uniquely generated UUID to identify initial and subsequent
|
|
* retries as part of a complete request lifecycle.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function invocationId()
|
|
{
|
|
return function (callable $handler) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request
|
|
) use ($handler){
|
|
return $handler($command, $request->withHeader(
|
|
'aws-sdk-invocation-id',
|
|
md5(uniqid(gethostname(), true))
|
|
));
|
|
};
|
|
};
|
|
}
|
|
/**
|
|
* Middleware wrapper function that adds a Content-Type header to requests.
|
|
* This is only done when the Content-Type has not already been set, and the
|
|
* request body's URI is available. It then checks the file extension of the
|
|
* URI to determine the mime-type.
|
|
*
|
|
* @param array $operations Operations that Content-Type should be added to.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function contentType(array $operations)
|
|
{
|
|
return function (callable $handler) use ($operations) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler, $operations) {
|
|
if (!$request->hasHeader('Content-Type')
|
|
&& in_array($command->getName(), $operations, true)
|
|
&& ($uri = $request->getBody()->getMetadata('uri'))
|
|
) {
|
|
$request = $request->withHeader(
|
|
'Content-Type',
|
|
Psr7\mimetype_from_filename($uri) ?: 'application/octet-stream'
|
|
);
|
|
}
|
|
|
|
return $handler($command, $request);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Tracks command and request history using a history container.
|
|
*
|
|
* This is useful for testing.
|
|
*
|
|
* @param History $history History container to store entries.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function history(History $history)
|
|
{
|
|
return function (callable $handler) use ($history) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler, $history) {
|
|
$ticket = $history->start($command, $request);
|
|
return $handler($command, $request)
|
|
->then(
|
|
function ($result) use ($history, $ticket) {
|
|
$history->finish($ticket, $result);
|
|
return $result;
|
|
},
|
|
function ($reason) use ($history, $ticket) {
|
|
$history->finish($ticket, $reason);
|
|
return Promise\rejection_for($reason);
|
|
}
|
|
);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a middleware that applies a map function to requests as they
|
|
* pass through the middleware.
|
|
*
|
|
* @param callable $f Map function that accepts a RequestInterface and
|
|
* returns a RequestInterface.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function mapRequest(callable $f)
|
|
{
|
|
return function (callable $handler) use ($f) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler, $f) {
|
|
return $handler($command, $f($request));
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a middleware that applies a map function to commands as they
|
|
* pass through the middleware.
|
|
*
|
|
* @param callable $f Map function that accepts a command and returns a
|
|
* command.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function mapCommand(callable $f)
|
|
{
|
|
return function (callable $handler) use ($f) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler, $f) {
|
|
return $handler($f($command), $request);
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a middleware that applies a map function to results.
|
|
*
|
|
* @param callable $f Map function that accepts an Aws\ResultInterface and
|
|
* returns an Aws\ResultInterface.
|
|
*
|
|
* @return callable
|
|
*/
|
|
public static function mapResult(callable $f)
|
|
{
|
|
return function (callable $handler) use ($f) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler, $f) {
|
|
return $handler($command, $request)->then($f);
|
|
};
|
|
};
|
|
}
|
|
|
|
public static function timer()
|
|
{
|
|
return function (callable $handler) {
|
|
return function (
|
|
CommandInterface $command,
|
|
RequestInterface $request = null
|
|
) use ($handler) {
|
|
$start = microtime(true);
|
|
return $handler($command, $request)
|
|
->then(
|
|
function (ResultInterface $res) use ($start) {
|
|
if (!isset($res['@metadata'])) {
|
|
$res['@metadata'] = [];
|
|
}
|
|
if (!isset($res['@metadata']['transferStats'])) {
|
|
$res['@metadata']['transferStats'] = [];
|
|
}
|
|
|
|
$res['@metadata']['transferStats']['total_time']
|
|
= microtime(true) - $start;
|
|
|
|
return $res;
|
|
},
|
|
function ($err) use ($start) {
|
|
if ($err instanceof AwsException) {
|
|
$err->setTransferInfo([
|
|
'total_time' => microtime(true) - $start,
|
|
] + $err->getTransferInfo());
|
|
}
|
|
return Promise\rejection_for($err);
|
|
}
|
|
);
|
|
};
|
|
};
|
|
}
|
|
}
|