feat: implement an exponential-backoff to find echo message #747
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Actionable comments posted: 1
🧹 Nitpick comments (2)
api/src/chat/services/chat.service.ts (2)
226-227: Consider renaming the variable for clarity.The variable
messageis misleading sincefindMessageWithRetriesreturns a boolean, not a message object. Consider renaming it tomessageExistsorfoundfor better code readability.- const message = await this.findMessageWithRetries(mid); + const messageExists = await this.findMessageWithRetries(mid); - if (!message) { + if (!messageExists) {Also applies to: 230-240
264-274: Consider adding bounds to prevent excessive delays.While the exponential backoff implementation is correct, consider adding an upper bound to the delay to prevent excessively long waits in edge cases. With the current implementation, the maximum delay could reach 1.6 seconds (100ms * 2^4) which seems reasonable, but adding a max delay parameter would make the method more robust.
async findMessageWithRetries( mid: string, maxRetries = 5, initialDelay = 100, + maxDelay = 1000, ) { let attempt = 0; let delay = initialDelay; while (attempt < maxRetries) { const exists = await this.messageService.count({ mid }); if (exists > 0) { return true; // Message exists } attempt++; await new Promise((resolve) => setTimeout(resolve, delay)); - delay *= 2; // Exponential backoff + delay = Math.min(delay * 2, maxDelay); // Exponential backoff with cap }
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📒 Files selected for processing (1)
api/src/chat/services/chat.service.ts(1 hunks)
🧰 Additional context used
🪛 Biome (1.9.4)
api/src/chat/services/chat.service.ts
[error] 228-228: This is an unexpected use of the debugger statement.
Unsafe fix: Remove debugger statement
(lint/suspicious/noDebugger)
🔇 Additional comments (1)
api/src/chat/services/chat.service.ts (1)
248-280: Well-implemented retry mechanism with exponential backoff.The implementation correctly addresses the timing issue described in the PR objectives. The exponential backoff strategy is appropriate for this use case, and the default parameters (5 retries, 100ms initial delay) provide a good balance between reliability and performance.
Key strengths:
- Uses
count()for efficient existence checking- Implements proper exponential backoff (doubling delay)
- Includes appropriate logging for debugging
- Has reasonable default parameters
- Clear JSDoc documentation
| this.eventEmitter.emit('hook:chatbot:sent', sentMessage); | ||
| const mid = event.getId(); | ||
| const message = await this.findMessageWithRetries(mid); | ||
| debugger; |
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Remove the debugger statement.
The debugger statement should be removed before merging to production as it will cause the code to break in debugger mode unexpectedly.
- debugger;📝 Committable suggestion
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| debugger; |
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🪛 Biome (1.9.4)
[error] 228-228: This is an unexpected use of the debugger statement.
Unsafe fix: Remove debugger statement
(lint/suspicious/noDebugger)
🤖 Prompt for AI Agents
In api/src/chat/services/chat.service.ts at line 228, remove the debugger
statement to prevent the code from breaking unexpectedly in debugger mode when
running in production.
3 participants
This PR introduces exponential backoff when checking for existing messages to prevent duplicate echo messages. Previously, echo messages could arrive before the original message was saved, causing them to be incorrectly treated as new messages.
Changes:
Behavior:
serves Issue #746
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