165 lines
5.7 KiB
PHP
165 lines
5.7 KiB
PHP
<?php
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namespace Appwrite\Messaging\Adapter;
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use Appwrite\Event\Realtime as EventRealtime;
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use Appwrite\Messaging\Adapter;
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class Realtime extends Adapter
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{
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/**
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* Connection Tree
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*
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* [CONNECTION_ID] ->
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* 'projectId' -> [PROJECT_ID]
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* 'roles' -> [ROLE_x, ROLE_Y]
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* 'channels' -> [CHANNEL_NAME_X, CHANNEL_NAME_Y, CHANNEL_NAME_Z]
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*/
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public array $connections = [];
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/**
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* Subscription Tree
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*
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* [PROJECT_ID] ->
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* [ROLE_X] ->
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* [CHANNEL_NAME_X] -> [CONNECTION_ID]
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* [CHANNEL_NAME_Y] -> [CONNECTION_ID]
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* [CHANNEL_NAME_Z] -> [CONNECTION_ID]
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* [ROLE_Y] ->
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* [CHANNEL_NAME_X] -> [CONNECTION_ID]
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* [CHANNEL_NAME_Y] -> [CONNECTION_ID]
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* [CHANNEL_NAME_Z] -> [CONNECTION_ID]
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*/
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public array $subscriptions = [];
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/**
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* Adds a subscribtion.
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* @param string $projectId Project ID.
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* @param mixed $connection Unique Identifier - Connection ID.
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* @param array $roles Roles of the Subscription.
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* @param array $channels Subscribed Channels.
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* @return void
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*/
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public function subscribe(string $projectId, mixed $connection, array $roles, array $channels): void
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{
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if (!isset($this->subscriptions[$projectId])) { // Init Project
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$this->subscriptions[$projectId] = [];
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}
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foreach ($roles as $role) {
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if (!isset($this->subscriptions[$projectId][$role])) { // Add user first connection
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$this->subscriptions[$projectId][$role] = [];
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}
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foreach ($channels as $channel => $list) {
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$this->subscriptions[$projectId][$role][$channel][$connection] = true;
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}
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}
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$this->connections[$connection] = [
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'projectId' => $projectId,
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'roles' => $roles,
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'channels' => $channels
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];
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}
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/**
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* Removes Subscription.
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*
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* @param mixed $connection
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* @return void
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*/
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public function unsubscribe(mixed $connection): void
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{
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$projectId = $this->connections[$connection]['projectId'] ?? '';
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$roles = $this->connections[$connection]['roles'] ?? [];
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foreach ($roles as $role) {
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foreach ($this->subscriptions[$projectId][$role] as $channel => $list) {
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unset($this->subscriptions[$projectId][$role][$channel][$connection]); // Remove connection
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if (empty($this->subscriptions[$projectId][$role][$channel])) {
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unset($this->subscriptions[$projectId][$role][$channel]); // Remove channel when no connections
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}
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}
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if (empty($this->subscriptions[$projectId][$role])) {
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unset($this->subscriptions[$projectId][$role]); // Remove role when no channels
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}
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}
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if (empty($this->subscriptions[$projectId])) { // Remove project when no roles
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unset($this->subscriptions[$projectId]);
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}
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unset($this->connections[$connection]);
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}
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/**
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* Checks if Channel has a subscriber.
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* @param string $projectId
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* @param string $role
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* @param string $channel
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* @return bool
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*/
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public function hasSubscriber(string $projectId, string $role, string $channel = ''): bool
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{
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if (empty($channel)) {
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return array_key_exists($projectId, $this->subscriptions)
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&& array_key_exists($role, $this->subscriptions[$projectId]);
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}
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return array_key_exists($projectId, $this->subscriptions)
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&& array_key_exists($role, $this->subscriptions[$projectId])
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&& array_key_exists($channel, $this->subscriptions[$projectId][$role]);
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}
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/**
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* Sends an event to the Realtime Server.
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* @param string $projectId
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* @param string $event
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* @param array $payload
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* @return void
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*/
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public function send(string $projectId, string $event, array $payload): void
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{
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$realtime = new EventRealtime($projectId, $event, $payload);
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$realtime->trigger();
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}
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/**
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* Identifies the receivers of all subscriptions, based on the permissions and event.
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*
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* Example of performance with an event with user:XXX permissions and with X users spread across 10 different channels:
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* - 0.014 ms (±6.88%) | 10 Connections / 100 Subscriptions
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* - 0.070 ms (±3.71%) | 100 Connections / 1,000 Subscriptions
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* - 0.846 ms (±2.74%) | 1,000 Connections / 10,000 Subscriptions
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* - 10.866 ms (±1.01%) | 10,000 Connections / 100,000 Subscriptions
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* - 110.201 ms (±2.32%) | 100,000 Connections / 1,000,000 Subscriptions
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* - 1,121.328 ms (±0.84%) | 1,000,000 Connections / 10,000,000 Subscriptions
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*
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* @param array $event
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*/
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public function getReceivers(array $event)
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{
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$receivers = [];
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if (isset($this->subscriptions[$event['project']])) {
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foreach ($this->subscriptions[$event['project']] as $role => $subscription) {
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foreach ($event['data']['channels'] as $channel) {
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if (
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\array_key_exists($channel, $this->subscriptions[$event['project']][$role])
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&& (\in_array($role, $event['permissions']) || \in_array('*', $event['permissions']))
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) {
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foreach (array_keys($this->subscriptions[$event['project']][$role][$channel]) as $ids) {
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$receivers[$ids] = 0;
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}
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break;
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}
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}
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}
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}
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return array_keys($receivers);
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}
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}
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