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<?php
namespace Aws\Endpoint;
use Aws\Exception\UnresolvedEndpointException;
/**
* Endpoint providers.
*
* An endpoint provider is a function that accepts a hash of endpoint options,
* including but not limited to "service" and "region" key value pairs. The
* endpoint provider function returns a hash of endpoint data, which MUST
* include an "endpoint" key value pair that represents the resolved endpoint
* or NULL if an endpoint cannot be determined.
*
* You can wrap your calls to an endpoint provider with the
* {@see EndpointProvider::resolve} function to ensure that an endpoint hash is
* created. If an endpoint hash is not created, then the resolve() function
* will throw an {@see Aws\Exception\UnresolvedEndpointException}.
*
* use Aws\Endpoint\EndpointProvider;
* $provider = EndpointProvider::defaultProvider();
* // Returns an array or NULL.
* $endpoint = $provider(['service' => 'ec2', 'region' => 'us-west-2']);
* // Returns an endpoint array or throws.
* $endpoint = EndpointProvider::resolve($provider, [
* 'service' => 'ec2',
* 'region' => 'us-west-2'
* ]);
*
* You can compose multiple providers into a single provider using
* {@see Aws\or_chain}. This function accepts providers as arguments and
* returns a new function that will invoke each provider until a non-null value
* is returned.
*
* $a = function (array $args) {
* if ($args['region'] === 'my-test-region') {
* return ['endpoint' => 'http://localhost:123/api'];
* }
* };
* $b = EndpointProvider::defaultProvider();
* $c = \Aws\or_chain($a, $b);
* $config = ['service' => 'ec2', 'region' => 'my-test-region'];
* $res = $c($config); // $a handles this.
* $config['region'] = 'us-west-2';
* $res = $c($config); // $b handles this.
*/
class EndpointProvider
{
/**
* Resolves and endpoint provider and ensures a non-null return value.
*
* @param callable $provider Provider function to invoke.
* @param array $args Endpoint arguments to pass to the provider.
*
* @return array
* @throws UnresolvedEndpointException
*/
public static function resolve(callable $provider, array $args = [])
{
$result = $provider($args);
if (is_array($result)) {
return $result;
}
throw new UnresolvedEndpointException(
'Unable to resolve an endpoint using the provider arguments: '
. json_encode($args) . '. Note: you can provide an "endpoint" '
. 'option to a client constructor to bypass invoking an endpoint '
. 'provider.');
}
/**
* Creates and returns the default SDK endpoint provider.
*
* @deprecated Use an instance of \Aws\Endpoint\Partition instead.
*
* @return callable
*/
public static function defaultProvider()
{
return PartitionEndpointProvider::defaultProvider();
}
/**
* Creates and returns an endpoint provider that uses patterns from an
* array.
*
* @param array $patterns Endpoint patterns
*
* @return callable
*/
public static function patterns(array $patterns)
{
return new PatternEndpointProvider($patterns);
}
}
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