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<?php |
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/** |
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* Abstract gate |
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* User: moyo |
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* Date: 24/08/2017 |
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* Time: 4:56 PM |
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*/ |
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namespace Carno\Consul\APIs; |
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use Carno\Consul\Results\Failed; |
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use Carno\Consul\Results\Success; |
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use Carno\Consul\Types\Agent; |
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use Carno\DNS\DNS; |
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use Carno\DNS\Result; |
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use Carno\HTTP\Client; |
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use Carno\HTTP\Contracts\Client as HTTP; |
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use Carno\HTTP\Options; |
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use Carno\HTTP\Standard\Request; |
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use Carno\HTTP\Standard\Response; |
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use Carno\HTTP\Standard\Streams\Body; |
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use Carno\HTTP\Standard\Uri; |
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use Carno\Promise\Promise; |
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use Carno\Promise\Promised; |
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abstract class AbstractGate |
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{ |
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// default to http |
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private const SCHEME = 'http'; |
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// version 1 |
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private const VERSION = 'v1'; |
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/** |
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* @var string |
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*/ |
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protected $method = 'GET'; |
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/** |
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* @var string |
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*/ |
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protected $uri = '/'; |
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/** |
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* @var array |
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*/ |
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protected $query = []; |
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/** |
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* @var int |
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*/ |
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protected $timeout = 5000; |
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/** |
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* provided agent |
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* @var Agent |
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*/ |
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private $agent = null; |
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/** |
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* assigned agent |
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* @var Agent |
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*/ |
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private $assigned = null; |
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/** |
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* @var Client[] |
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*/ |
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private $http = []; |
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/** |
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* @var string |
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*/ |
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private $payloadType = 'application/json'; |
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/** |
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* @var string |
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*/ |
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private $payloadData = '{}'; |
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/** |
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* AbstractAPI constructor. |
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* @param Agent $agent |
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*/ |
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final public function __construct(Agent $agent) |
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{ |
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$this->agent = $agent; |
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} |
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/** |
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* @return Agent |
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*/ |
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final protected function agent() : Agent |
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{ |
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return $this->agent; |
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} |
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/** |
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* @return Agent |
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*/ |
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final protected function assigned() : Agent |
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{ |
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return $this->assigned ?? $this->agent; |
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} |
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/** |
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* @return Promised |
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*/ |
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final private function assigning() : Promised |
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{ |
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if ($this->assigned) { |
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return Promise::resolved($this->assigned); |
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} |
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DNS::resolve($this->agent->host())->then(function (Result $result) { |
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return $this->assigned = new Agent($result->random(), $this->agent->port()); |
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})->sync($resolving = Promise::deferred()); |
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return $resolving; |
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} |
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/** |
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* @param Agent $agent |
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* @return HTTP |
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*/ |
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final private function http(Agent $agent) : HTTP |
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{ |
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return |
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$this->http[$agent->host()] ?? |
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$this->http[$agent->host()] = new Client((new Options)->setTimeouts($this->timeout), $agent) |
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; |
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} |
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/** |
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* @param string $key |
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* @param string $replaced |
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*/ |
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final protected function setVars(string $key, string $replaced) : void |
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{ |
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$this->uri = str_replace(sprintf(':%s', $key), $replaced, $this->uri); |
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} |
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/** |
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* @param string $key |
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* @param $val |
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*/ |
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final protected function setQuery(string $key, $val) : void |
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{ |
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is_scalar($val) && $this->query[$key] = $val; |
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} |
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/** |
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* @param array $data |
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*/ |
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final protected function setPayload(array $data) : void |
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{ |
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$this->payloadData = json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE); |
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} |
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/** |
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* @return string |
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*/ |
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final protected function getPayload() : string |
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{ |
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return $this->payloadData; |
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} |
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/** |
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* @param string $raw |
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* @return array |
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*/ |
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final protected function decodeResponse(string $raw) : array |
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{ |
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return json_decode($raw, true); |
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} |
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/** |
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* @param Promised $canceller |
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* @return Promised|Response |
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*/ |
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final protected function perform(Promised $canceller = null) : Promised |
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{ |
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$this->assigning()->sync($resolved = Promise::deferred()); |
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return $resolved->then(function (Agent $agent) use ($canceller) { |
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$request = new Request( |
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$this->method, |
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new Uri( |
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self::SCHEME, |
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$agent->host(), |
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$agent->port(), |
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sprintf("/%s", self::VERSION) . $this->uri, |
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$this->query |
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), |
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[ |
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'Content-Type' => $this->payloadType, |
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], |
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new Body($this->getPayload()) |
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); |
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return $this->http($agent)->perform($request, $canceller); |
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}); |
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} |
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/** |
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* @return Promised|Success|Failed |
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*/ |
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final protected function simpleHCodeResult() |
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{ |
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return $this->perform()->then(static function (Response $response) { |
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return |
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$response->getStatusCode() === 200 |
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? new Success |
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: new Failed((string)$response->getBody()) |
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; |
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}); |
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} |
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/** |
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* @return mixed |
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*/ |
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abstract public function result(); |
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} |
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