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utils.extractDuration: improved json detection #276

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utils.extractDuration: improved json detection #276

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16 changes: 15 additions & 1 deletion lambda/utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -604,14 +604,28 @@ module.exports.computeAverageDuration = (durations, discardTopBottom) => {
return averageDuration;
};

/**
* Returns true if provided string is valid json, false otherwise
* @param str string to check
* @returns {boolean}
*/
module.exports.isValidJSON = (str) => {
try {
JSON.parse(str);
return true;
} catch (e) {
return false;
}
};

/**
* Extract duration (in ms) from a given Lambda's CloudWatch log.
*/
module.exports.extractDuration = (log, durationType) => {
if (!durationType){
durationType = DURATIONS.durationMs; // default to `durationMs`
}
if (log.charAt(0) === '{') {
if (utils.isValidJSON(log)) {
// extract from JSON (multi-line)
return utils.extractDurationFromJSON(log, durationType);
} else {
Expand Down