|
1
|
|
|
<?php |
|
2
|
|
|
namespace IntegerNet\CallbackProxy; |
|
3
|
|
|
|
|
4
|
|
|
use GuzzleHttp\Client; |
|
5
|
|
|
use GuzzleHttp\Exception\RequestException; |
|
6
|
|
|
use Psr\Http\Message\RequestInterface; |
|
7
|
|
|
use Psr\Http\Message\ResponseInterface; |
|
8
|
|
|
use Psr\Http\Message\UriInterface; |
|
9
|
|
|
|
|
10
|
|
|
/** |
|
11
|
|
|
* Dispatches a request to multiple targets, returns first successful response (HTTP 200) or last response if none are |
|
12
|
|
|
* successful |
|
13
|
|
|
*/ |
|
14
|
|
|
class Dispatcher |
|
15
|
|
|
{ |
|
16
|
|
|
/** |
|
17
|
|
|
* @var Client |
|
18
|
|
|
*/ |
|
19
|
|
|
private $client; |
|
20
|
|
|
/** |
|
21
|
|
|
* @var UriInterface[] |
|
22
|
|
|
*/ |
|
23
|
|
|
private $targets; |
|
24
|
|
|
|
|
25
|
39 |
|
public function __construct(Client $client, UriInterface ...$targets) |
|
26
|
|
|
{ |
|
27
|
39 |
|
$this->client = $client; |
|
28
|
39 |
|
$this->targets = $targets; |
|
29
|
39 |
|
} |
|
30
|
|
|
|
|
31
|
39 |
|
public function dispatch(RequestInterface $request, ResponseInterface $response, string $action): ResponseInterface |
|
32
|
|
|
{ |
|
33
|
39 |
|
$firstSuccessfulResponse = null; |
|
34
|
39 |
|
foreach ($this->targets as $target) { |
|
35
|
39 |
|
$response = $this->dispatchSingle($request, $target, $action); |
|
36
|
39 |
|
if ($firstSuccessfulResponse === null && $this->responseIsSuccessful($response)) { |
|
37
|
39 |
|
$firstSuccessfulResponse = $response; |
|
38
|
|
|
} |
|
39
|
|
|
} |
|
40
|
39 |
|
return $firstSuccessfulResponse ?? $response; |
|
41
|
|
|
} |
|
42
|
|
|
|
|
43
|
39 |
|
private function dispatchSingle(RequestInterface $request, UriInterface $target, string $action) : ResponseInterface |
|
44
|
|
|
{ |
|
45
|
39 |
|
$target = $target->withPath($target->getPath() . $action); |
|
46
|
|
|
try { |
|
47
|
39 |
|
return $this->responseWithTargetHeader($this->client->send($request->withUri($target)), $target); |
|
48
|
9 |
|
} catch (RequestException $e) { |
|
49
|
9 |
|
if ($e->getResponse() instanceof ResponseInterface) { |
|
50
|
9 |
|
return $this->responseWithTargetHeader($e->getResponse(), $target); |
|
51
|
|
|
} |
|
52
|
|
|
throw $e; |
|
53
|
|
|
} |
|
54
|
|
|
} |
|
55
|
|
|
|
|
56
|
39 |
|
private function responseWithTargetHeader(ResponseInterface $response, UriInterface $target) |
|
57
|
|
|
{ |
|
58
|
39 |
|
return $response->withHeader('X-Response-From', $target->__toString()); |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
39 |
|
private function responseIsSuccessful(ResponseInterface $response): bool |
|
62
|
|
|
{ |
|
63
|
39 |
|
return $response->getStatusCode() >= 200 && $response->getStatusCode() < 300; |
|
64
|
|
|
} |
|
65
|
|
|
} |
|
66
|
|
|
|
integer-net /
callback-proxy
