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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 Amp\CompositeCancellation; |
| 25 | use Amp\Socket\Socket as SocketInterface; |
| 26 | use Amp\TimeoutCancellation; |
| 27 | use Ndrstmr\Icap\Config; |
| 28 | |
| 29 | /** |
| 30 | * One-acquired-socket binding used for multi-round-trip flows like |
| 31 | * the strict RFC 3507 §4.5 preview-continue exchange. |
| 32 | * |
| 33 | * Lifecycle: |
| 34 | * - {@see AsyncAmpTransport::openSession()} acquires a socket from |
| 35 | * the pool (or opens a fresh one). |
| 36 | * - The caller writes / reads as many times as the protocol |
| 37 | * requires. |
| 38 | * - The caller calls {@see release()} on success (returns to the |
| 39 | * pool when one is configured) or {@see close()} on failure. |
| 40 | */ |
| 41 | final class AmpTransportSession implements TransportSession |
| 42 | { |
| 43 | private bool $disposed = false; |
| 44 | |
| 45 | public function __construct( |
| 46 | private readonly Config $config, |
| 47 | private readonly SocketInterface $socket, |
| 48 | private readonly float $streamTimeout, |
| 49 | private readonly ?Cancellation $userCancellation, |
| 50 | private readonly int $maxResponseSize, |
| 51 | private readonly int $maxHeaderLineLength, |
| 52 | private readonly ?ConnectionPoolInterface $pool, |
| 53 | ) { |
| 54 | } |
| 55 | |
| 56 | #[\Override] |
| 57 | public function write(iterable $chunks): void |
| 58 | { |
| 59 | $this->assertActive(); |
| 60 | foreach ($chunks as $chunk) { |
| 61 | if ($chunk !== '') { |
| 62 | $this->socket->write($chunk); |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | #[\Override] |
| 68 | public function readResponse(): string |
| 69 | { |
| 70 | $this->assertActive(); |
| 71 | $reader = new ResponseFrameReader( |
| 72 | maxResponseSize: $this->maxResponseSize, |
| 73 | maxHeaderLineLength: $this->maxHeaderLineLength, |
| 74 | ); |
| 75 | $cancellation = $this->makeIoCancellation(); |
| 76 | $socket = $this->socket; |
| 77 | return $reader->readFrom(static fn (): ?string => $socket->read($cancellation)); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Creates a fresh TimeoutCancellation for a single IO phase, |
| 82 | * combined with the optional user-supplied Cancellation. |
| 83 | * |
| 84 | * Each call gets the full streamTimeout window — no session-lifetime |
| 85 | * timer that accumulates across multiple preview-continue round trips. |
| 86 | */ |
| 87 | private function makeIoCancellation(): Cancellation |
| 88 | { |
| 89 | $timeout = new TimeoutCancellation($this->streamTimeout); |
| 90 | if ($this->userCancellation === null) { |
| 91 | return $timeout; |
| 92 | } |
| 93 | return new CompositeCancellation($this->userCancellation, $timeout); |
| 94 | } |
| 95 | |
| 96 | #[\Override] |
| 97 | public function release(): void |
| 98 | { |
| 99 | if ($this->disposed) { |
| 100 | return; |
| 101 | } |
| 102 | $this->disposed = true; |
| 103 | |
| 104 | if ($this->pool !== null) { |
| 105 | $this->pool->release($this->config, $this->socket); |
| 106 | return; |
| 107 | } |
| 108 | $this->socket->close(); |
| 109 | } |
| 110 | |
| 111 | #[\Override] |
| 112 | public function close(): void |
| 113 | { |
| 114 | if ($this->disposed) { |
| 115 | return; |
| 116 | } |
| 117 | $this->disposed = true; |
| 118 | $this->socket->close(); |
| 119 | } |
| 120 | |
| 121 | private function assertActive(): void |
| 122 | { |
| 123 | if ($this->disposed) { |
| 124 | throw new \LogicException('TransportSession has already been released or closed.'); |
| 125 | } |
| 126 | } |
| 127 | } |