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Build a resilient Yii2 Telegram integration by separating API transport, update intake, and bot logic; recording each Telegram update_id before non-idempotent work; and validating Telegram’s webhook secret at the HTTP boundary. Telegram supports either webhook delivery or getUpdates long polling for a bot—not both at once—and its update retention period is no longer than 24 hours.
What the service layer should do
A service layer gives controllers and business code a stable way to work with Telegram without coupling them to HTTP details or a particular PHP SDK. Yii2 does not prescribe this architecture; it provides components and dependency injection that make it practical.
- API client: Sends Bot API requests and translates transport failures and Telegram API responses into errors the application can handle.
- Update repository: Persists incoming update identifiers and processing state so duplicate deliveries can be recognized and work can be resumed or safely skipped.
- Bot service: Applies application rules to an update and invokes the API client for outbound actions.
- Ingress endpoint or poller: Accepts updates and delegates them to the bot service; it should not contain business rules.
- Logging and metrics: Records outcomes and delivery problems without exposing the bot token or unnecessary user content.
Yii application components are shared services initialized on first access. The dependency-injection container can construct objects with explicit collaborators. Use a component when application-wide access and lifecycle are useful; constructor injection keeps dependencies visible and replaceable. See the Yii application components guide and Yii dependency injection guide.
Example service boundary
The following is SDK-neutral PHP pseudocode. Adapt configuration keys, repository methods, and exception types to the application; it does not assume a specific Telegram library.
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final class TelegramBotService
{
public function __construct(
private TelegramApiClient $api,
private UpdateRepository $updates,
private LoggerInterface $logger,
) {}
public function handle(array $update): void
{
$updateId = $update['update_id'] ?? null;
if (!is_int($updateId)) {
throw new InvalidArgumentException('Missing or invalid update_id');
}
// Atomically claim a unique update_id before non-idempotent effects.
if (!$this->updates->claim($updateId)) {
$this->logger->info('Duplicate Telegram update ignored', [
'update_id' => $updateId,
]);
return;
}
try {
$this->processBusinessRules($update);
$this->updates->markProcessed($updateId);
} catch (Throwable $e) {
$this->updates->markFailed($updateId, $e);
throw $e;
}
}
private function processBusinessRules(array $update): void
{
// Application-specific behavior; invoke $this->api as needed.
}
}The repository claim must be atomic, typically enforced with a unique database constraint on update_id. A check-then-insert sequence without a uniqueness guarantee can allow two concurrent deliveries to process the same update. Define recovery for rows left in a processing state after a worker crash; do not treat a recorded identifier as proof that all business effects completed.
Register dependencies in Yii
Configure the concrete client, repository, and service through Yii’s application configuration or container definitions. Keep credentials in deployment configuration or a secret store rather than source control.
return [
'container' => [
'definitions' => [
TelegramApiClient::class => TelegramHttpApiClient::class,
UpdateRepository::class => DbUpdateRepository::class,
],
],
'components' => [
'telegramBot' => [
'class' => TelegramBotService::class,
],
],
];This illustrates the registration shape, not a drop-in configuration for every Yii2 application: constructor arguments and component configuration depend on the concrete classes. Yii components are configured in the application configuration and created when first accessed.
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Choose one update intake mode
Telegram offers webhook delivery and getUpdates long polling as mutually exclusive intake methods for the same bot. Choose based on the deployment you can operate reliably.
| Choice | Deployment shape | How progress is handled | Operational focus |
|---|---|---|---|
| Webhook | A publicly reachable HTTPS endpoint that receives Telegram HTTP POST requests. | Persist each received update_id and processing state in the application before triggering non-idempotent effects. |
Web-server availability, request validation, response behavior, and Telegram’s webhook delivery status. |
getUpdates long polling |
A running poller process that requests updates from Telegram. | Telegram’s offset behavior confirms updates; advance the offset only in coordination with durable application processing. | Poller lifecycle, restart behavior, and durable tracking of work completed before advancing progress. |
Telegram retains updates for no longer than 24 hours. Its Bot API describes retrying unsuccessful webhook deliveries and eventually giving up after a “reasonable amount of attempts,” without specifying a fixed retry count or schedule. Do not build recovery assumptions around a particular backoff or guarantee. See Telegram’s Bot API documentation and webhook guide.
When a webhook fits
Use a webhook when the application can reliably serve an HTTPS route and handle incoming requests promptly. Telegram sends updates as HTTPS POST requests. The webhook guide discusses hosting and certificate considerations; confirm that the endpoint is reachable and configured for the deployment before switching intake modes.
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When long polling fits
Use getUpdates when a continuously managed worker is a better fit than public HTTP ingress. Run one controlled poller for the bot and make its offset advancement consistent with the application’s durable processing record. If the poller advances past an update before its effects are safely recorded, a process failure can leave the application without a straightforward way to replay that work.
Make update handling safe to repeat
Telegram’s update_id helps identify repeated deliveries and restore update order. It does not give the application exactly-once processing: Telegram cannot atomically commit a database change or an external side effect in your Yii application. Design for duplicate and interrupted work.
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update_idand validate the fields needed by the relevant handler. Reject or quarantine malformed payloads rather than letting them trigger partial behavior. - Claim the identifier durably. Insert the update ID and initial status under a unique constraint before applying non-idempotent business changes.
- Handle duplicates deliberately. If the ID is already complete, return a safe no-op. If it is still processing or previously failed, apply a defined recovery path rather than silently treating every existing row as complete.
- Make effects repeatable where possible. Use idempotency keys, uniqueness constraints, or transactional state changes for actions such as creating a record or granting a benefit. For external effects that cannot share a database transaction, record intent and outcome so a retry can be reconciled.
- Record completion and failure. Persist status and enough error context to investigate. Keep raw payload retention proportionate to privacy and security requirements.
Update ordering may matter to a conversation or workflow. Use the identifier and stored state to detect gaps or out-of-order handling where the business logic requires ordering; do not assume concurrent workers will finish in the same order Telegram delivered updates.
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Secure and slim down webhook ingress
Configure a webhook secret_token with Telegram and compare the corresponding request header, X-Telegram-Bot-Api-Secret-Token, at the ingress boundary. The secret helps verify that a request is associated with the configured webhook; it does not replace HTTPS or payload validation. Telegram documents the option in its setWebhook API method.
public function actionTelegram(): Response
{
$expected = Yii::$app->params['telegramWebhookSecret'];
$provided = Yii::$app->request->headers->get(
'X-Telegram-Bot-Api-Secret-Token'
);
if (!is_string($expected) || $expected === ''
|| !is_string($provided)
|| !hash_equals($expected, $provided)) {
throw new UnauthorizedHttpException('Invalid webhook secret');
}
$update = Json::decode(Yii::$app->request->getRawBody(), true);
if (!is_array($update)) {
throw new BadRequestHttpException('Invalid update payload');
}
Yii::$app->telegramBot->handle($update);
return $this->asJson(['ok' => true]);
}This action shows the boundary checks, not every production concern. Configure the route and request-size limits for the application, keep the secret outside version control, and choose response handling that matches the processing model. If handling is asynchronous, durably enqueue the update before acknowledging it; returning success before either processing or durable acceptance can lose work. If processing is synchronous, keep the request path bounded and ensure a failure produces an unsuccessful delivery response when redelivery is desired.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Isolate Telegram API failures
Keep outbound Bot API calls inside the client/service boundary. The client should distinguish network or timeout errors from Telegram API responses; the service should distinguish those from application validation and business-rule failures. Include the relevant update_id or a correlation identifier in internal logs so an inbound update and its outbound actions can be traced together.
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- Retry a transient network failure only when the operation is safe to repeat or has an application-level idempotency strategy.
- Do not blindly repeat a request merely because the client timed out; the remote action may have succeeded even if the response was lost.
- Surface permanent API rejections and invalid application data for correction instead of retrying them indefinitely.
- Bound retry attempts and delays in your own worker policy, and expose exhausted work for alerting or manual recovery. Exact Telegram retry-after and outgoing rate-limit behavior is not established here, so consult current method responses and API documentation before implementing those policies.
Monitor delivery and application processing
Telegram’s webhook information includes pending update count and the most recent delivery error. Check it alongside application-level telemetry: Telegram’s view of delivery cannot show whether your business transaction completed after your endpoint accepted a request.
- Count accepted, duplicate, failed, and delayed updates.
- Track age of the oldest pending or failed application update and alert when it exceeds your operational threshold.
- Log the intake mode, update ID, processing status, and relevant error class; never log the bot token or the webhook secret.
- Use Yii log categories and severity levels to route operational events separately from routine diagnostic messages.
- Monitor the poller’s liveness and last successful offset advancement when using long polling.
Yii logging supports levels, categories, and configured targets. Yii’s error handler handles uncaught PHP errors and exceptions, but it does not replace application-level tracking of accepted updates, duplicates, or work that has been durably queued. See the Yii logging guide and Yii error handler API reference.
Deployment checklist
- Use exactly one intake mode for the bot and document how it is operated.
- For webhooks, serve the configured endpoint over HTTPS and validate the Telegram secret header before parsing business data.
- For long polling, supervise the worker and coordinate offset advancement with durable processing.
- Persist
update_idunder a uniqueness constraint and define duplicate, crash-recovery, and failed-update behavior. - Keep transport code, bot rules, persistence, and ingress responsibilities separate.
- Measure delivery failures and application processing outcomes; alert on stalled or aging work.
- Keep credentials and sensitive user content out of logs and source control.
The framework guidance here is for Yii 2.0, and Telegram details refer to its Bot API documentation current as accessed on October 4, 2026. No specific Yii2 Telegram SDK or PHP runtime compatibility is assumed; the examples are SDK-neutral and should be adapted to the client and deployment you choose.
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