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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * SPDX-License-Identifier: EUPL-1.2 |
| 5 | * |
| 6 | * This file is part of icap-flow. |
| 7 | * |
| 8 | * Licensed under the EUPL, Version 1.2 only (the "Licence"); |
| 9 | * you may not use this work except in compliance with the Licence. |
| 10 | * You may obtain a copy of the Licence at: |
| 11 | * |
| 12 | * https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the Licence is distributed on an "AS IS" basis, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace Ndrstmr\Icap\Transport; |
| 22 | |
| 23 | use Amp\Cancellation; |
| 24 | use Ndrstmr\Icap\Config; |
| 25 | use Ndrstmr\Icap\DTO\IcapResponse; |
| 26 | |
| 27 | /** |
| 28 | * Blocking transport using plain PHP stream sockets, for CLI and test usage. TLS is not supported; production |
| 29 | * deployments use {@see AsyncAmpTransport} (TLS, pooling, cancellation that interrupts a wait). |
| 30 | * |
| 31 | * Every exchange runs on a {@see SynchronousStreamSession}, which holds the limits, the cancellation and the framing. |
| 32 | * A request is a session of its own that is closed after its response, and its write keeps the limit of this |
| 33 | * transport: `streamTimeout` is the time the peer may go without taking a byte. {@see openSession()} hands the session |
| 34 | * out for an exchange of more than one round trip, such as a preview that the server answers with `100 Continue` |
| 35 | * (RFC 3507 ยง4.5); each of its writes has one window for the whole call ({@see TransportSession::write()}). |
| 36 | */ |
| 37 | final class SynchronousStreamTransport implements SessionAwareTransport, DiscardingTransport |
| 38 | { |
| 39 | /** |
| 40 | * @param iterable<string> $rawRequest |
| 41 | * @return \Amp\Future<string> |
| 42 | */ |
| 43 | #[\Override] |
| 44 | public function request(Config $config, iterable $rawRequest, ?Cancellation $cancellation = null): \Amp\Future |
| 45 | { |
| 46 | return $this->exchange($config, $rawRequest, $cancellation, static fn (SynchronousStreamSession $session): string => $session->readResponse()); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * @param iterable<string> $rawRequest |
| 51 | * @return \Amp\Future<IcapResponse> |
| 52 | */ |
| 53 | #[\Override] |
| 54 | public function requestDiscardingBody(Config $config, iterable $rawRequest, int $maxResponseBytes, ?Cancellation $cancellation = null): \Amp\Future |
| 55 | { |
| 56 | return $this->exchange($config, $rawRequest, $cancellation, static fn (SynchronousStreamSession $session): IcapResponse => $session->readResponseDiscardingBody($maxResponseBytes)); |
| 57 | } |
| 58 | |
| 59 | #[\Override] |
| 60 | public function openSession(Config $config, ?Cancellation $cancellation = null): SynchronousStreamSession |
| 61 | { |
| 62 | return SynchronousStreamSession::open($config, $cancellation); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * One request on a session of its own, and what the caller reads from it. |
| 67 | * |
| 68 | * @template T |
| 69 | * |
| 70 | * @param iterable<string> $rawRequest |
| 71 | * @param \Closure(SynchronousStreamSession): T $read |
| 72 | * |
| 73 | * @return \Amp\Future<T> |
| 74 | */ |
| 75 | private function exchange(Config $config, iterable $rawRequest, ?Cancellation $cancellation, \Closure $read): \Amp\Future |
| 76 | { |
| 77 | $session = $this->openSession($config, $cancellation); |
| 78 | try { |
| 79 | $session->sendRequest($rawRequest); |
| 80 | |
| 81 | return \Amp\Future::complete($read($session)); |
| 82 | } finally { |
| 83 | $session->close(); |
| 84 | } |
| 85 | } |
| 86 | } |