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Expo Push Duplicate messages are being sent to users.

The same message is being sent multiple times due to lack of deduplication logic.

Understanding Expo Push Notifications

Expo Push Notifications is a service provided by Expo that allows developers to send notifications to their app users. It is designed to simplify the process of integrating push notifications into React Native applications, providing a unified interface for both iOS and Android platforms.

Identifying the Symptom: Duplicate Messages

One common issue developers encounter is the sending of duplicate messages to users. This can lead to a poor user experience, as users may receive the same notification multiple times, causing confusion or annoyance.

What You Might Observe

Users report receiving the same notification multiple times, or you notice in your logs that the same message ID is being processed repeatedly.

Exploring the Issue: DuplicateMessage

The DuplicateMessage issue arises when the same notification is sent multiple times. This can occur due to various reasons, such as retry logic not being properly implemented or lack of deduplication checks in the message sending process.

Root Cause Analysis

The primary root cause is often the absence of deduplication logic in the notification sending workflow. Without this, the system may inadvertently send the same message multiple times, especially in scenarios where retries are involved.

Steps to Resolve DuplicateMessage Issue

To resolve this issue, you need to implement deduplication logic in your notification sending process. Here are the steps to achieve this:

1. Implement Message ID Tracking

Assign a unique ID to each message before sending it. Store this ID in a database or cache to track which messages have already been sent.

const messageId = generateUniqueId(); // Function to generate a unique ID

2. Check for Existing Message IDs

Before sending a new message, check if the message ID already exists in your tracking system. If it does, skip sending the message.

if (isMessageIdSent(messageId)) {
console.log('Message already sent. Skipping.');
} else {
sendPushNotification(message);
markMessageIdAsSent(messageId);
}

3. Implement Retry Logic with Caution

Ensure that your retry logic does not inadvertently resend messages. Use exponential backoff strategies and check message IDs before each retry.

Additional Resources

For more information on implementing push notifications with Expo, you can refer to the Expo Push Notifications Documentation. Additionally, consider exploring best practices for building notifications on Android and UserNotifications framework on iOS.

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