GCP - Cloud Functions
Why does this Pub/Sub triggered function fail?
exports.processMessage = (event) => {
const msg = event.data.toString();
console.log(msg);
};
Options:
Why does this Pub/Sub triggered function fail? exports.processMessage = (event) => { const msg = event.data.toString(); console.log(msg); }; Options:
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Pub/Sub message data format
Pub/Sub message data is base64 encoded, so direct toString() gives wrong result.Step 2: Correct decoding method
Must decode base64 first, then convert to string to get readable message.Final Answer:
event.data is base64 encoded; must decode before toString() -> Option BQuick Check:
Decode base64 before toString() [OK]
Quick Trick: Always decode base64 data before converting to string [OK]
Common Mistakes:
- Calling toString() directly on base64 data
- Assuming context parameter is required
- Thinking function must be async
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