File Client/Subscription/SubscriptionStream.php

1:	<?php
2:
3:	declare(strict_types=1);
4:
5:	/**
6:	* This file is part of the Nexus MCP SDK package.
7:	*
8:	* (c) 2026 John Paul E. Balandan, CPA <paulbalandan@gmail.com>
9:	*
10:	* For the full copyright and license information, please view
11:	* the LICENSE file that was distributed with this source code.
12:	*/
13:
14:	namespace Nexus\Mcp\Client\Subscription;
15:
16:	use Amp\Future;
17:	use Nexus\Mcp\Client\Exception\SubscriptionDeliveryDroppedException;
18:	use Nexus\Mcp\Core\Exception\LogicException;
19:	use Nexus\Mcp\Core\Exception\RemoteCallFailedException;
20:	use Nexus\Mcp\Core\Schema\RequestId;
21:	use Nexus\Mcp\Core\Schema\Result\SubscriptionsListenResult;
22:
23:	/**
24:	* An open `subscriptions/listen` stream, surviving a restart under the same subscription id.
25:	*/
26:	final class SubscriptionStream
27:	{
28:	private bool $closed = false;
29:
30:	/**
31:	* @param Future<SubscriptionsListenResult> $outcome
32:	* @param \Closure(): void $onClose
33:	*
34:	* @internal
35:	*/
36:	public function __construct(
37:	public readonly RequestId $subscriptionId,
38:	private readonly Future $outcome,
39:	private readonly \Closure $onClose,
40:	) {
41:	}
42:
43:	/**
44:	* Stops the stream, with subsequent calls no-ops.
45:	*/
46:	public function close(): void
47:	{
48:	if ($this->closed) {
49:	return;
50:	}
51:
52:	$this->closed = true;
53:	($this->onClose)();
54:	}
55:
56:	/**
57:	* Blocks until the server tears the subscription down of its own accord.
58:	*
59:	* @throws LogicException
60:	* @throws RemoteCallFailedException
61:	* @throws SubscriptionDeliveryDroppedException
62:	*/
63:	public function await(): SubscriptionsListenResult
64:	{
65:	if ($this->closed) {
66:	throw new LogicException(\sprintf(
67:	'Subscription %s was closed by this client, so it carries no response to await.',
68:	var_export($this->subscriptionId->id, true),
69:	));
70:	}
71:
72:	return $this->outcome->await();
73:	}
74:	}
75:

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