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refactor(NODE-6616): short circuit EJSON stringifying #4360

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refactor(NODE-6616): short circuit EJSON stringifying #4360

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34 changes: 33 additions & 1 deletion src/mongo_logger.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import { inspect, promisify } from 'util';
import { isUint8Array } from 'util/types';

import { type Document, EJSON, type EJSONOptions, type ObjectId } from './bson';
import type { CommandStartedEvent } from './cmap/command_monitoring_events';
Expand Down Expand Up @@ -421,13 +422,44 @@ export function stringifyWithMaxLen(
): string {
let strToTruncate = '';

let currentLength = 0;
const maxDocumentLengthEnsurer = function maxDocumentLengthEnsurer(key: string, value: any) {
if (currentLength >= maxDocumentLength) {
return undefined;
}

currentLength += key.length + 4;

if (typeof value === 'string') {
currentLength += value.length;
} else if (typeof value === 'number' || typeof value === 'bigint') {
currentLength += 20;
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@baileympearson baileympearson Jan 3, 2025 •
edited
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where is this lengths coming from? wouldn't the length of numbers be dependent on the actual number being stringified (ex: 0 would be 1, but 1.1234 would be 6?)

} else if (typeof value === 'boolean') {
currentLength += value ? 4 : 5;
} else if (value != null && typeof value === 'object' && '_bsontype' in value) {
if (isUint8Array(value.buffer)) {
currentLength += (value.buffer.byteLength + value.buffer.byteLength * 0.5) | 0;
} else if (value._bsontype === 'Binary') {
currentLength += (value.position + value.position * 0.3) | 0;
} else if (value._bsontype === 'Code') {
currentLength += value.code.length;
}
}

return value;
};

if (typeof value === 'string') {
strToTruncate = value;
} else if (typeof value === 'function') {
strToTruncate = value.name;
} else {
try {
strToTruncate = EJSON.stringify(value, options);
if (maxDocumentLength !== 0) {
strToTruncate = EJSON.stringify(value, maxDocumentLengthEnsurer, 0, options);
} else {
strToTruncate = EJSON.stringify(value, options);
}
} catch (e) {
strToTruncate = `Extended JSON serialization failed with: ${e.message}`;
}
Expand Down
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