use Symbol.for('level') when extracting label

[jburghardt]

following line extract the level information from the info object and uses them as the level label

https://github.com/JaniAnttonen/winston-loki/blob/development/index.js#L58

this causes problems when using

• colorized text
• text that is padded for formation
• levels that are lower or uppercase

instead the Symbol.for('level') should be used, as per docu of winston::
https://github.com/winstonjs/winston#streams-objectmode-and-info-objects

Checklist

• Modify index.js ✓ e35241a Edit
• Running GitHub Actions for index.js ✓ Edit

[sweep-ai]

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winston-loki/index.js

Lines 47 to 104 in 88399c8

	*/
	log (info, callback) {
	// Immediately tell Winston that this transport has received the log.
	setImmediate(() => {
	this.emit('logged', info)
	})
	// Deconstruct the log
	const { label, labels, timestamp, level, message, ...rest } = info
	// build custom labels if provided
	let lokiLabels = { level: level }
	if (this.labels) {
	lokiLabels = Object.assign(lokiLabels, this.labels)
	} else {
	lokiLabels.job = label
	}
	lokiLabels = Object.assign(lokiLabels, labels)
	// follow the format provided
	const line = this.useCustomFormat
	? info[MESSAGE]
	: `${message} ${
	rest && Object.keys(rest).length > 0 ? JSON.stringify(rest) : ''
	}`
	// Make sure all label values are strings
	lokiLabels = Object.fromEntries(Object.entries(lokiLabels).map(([key, value]) => [key, value ? value.toString() : value]))
	// Construct the log to fit Grafana Loki's accepted format
	let ts
	if (timestamp) {
	ts = new Date(timestamp)
	ts = isNaN(ts) ? Date.now() : ts.valueOf()
	} else {
	ts = Date.now()
	}
	const logEntry = {
	labels: lokiLabels,
	entries: [
	{
	ts,
	line
	}
	]
	}
	// Pushes the log to the batcher
	this.batcher.pushLogEntry(logEntry).catch(err => {
	// eslint-disable-next-line no-console
	console.error(err)
	})
	// Trigger the optional callback
	callback()

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Step 2: ⌨️ Coding

• Modify index.js ✓ e35241a Edit

Modify index.js with contents:
• In the `log` function within `index.js`, locate the line where the `level` is being extracted from the `info` object (currently line 55).
• Replace the direct access of the `level` property with the use of `Symbol.for('level')` to extract the log level. This involves changing the line from: ```javascript const { label, labels, timestamp, level, message, ...rest } = info ``` to: ```javascript const { label, labels, timestamp, message, ...rest } = info const level = info[Symbol.for('level')] ```
• This change ensures that the log level is extracted in a manner that is compatible with Winston's handling of log levels, addressing the issue of colorized text, padded formatting, and case sensitivity of log levels.
• No other changes are required in `index.js` or any other files to resolve the reported issue.

--- 
+++ 
@@ -52,7 +52,8 @@
     })
 
     // Deconstruct the log
-    const { label, labels, timestamp, level, message, ...rest } = info
+    const { label, labels, timestamp, message, ...rest } = info
+    const level = info[Symbol.for('level')]
 
     // build custom labels if provided
     let lokiLabels = { level: level }

• Running GitHub Actions for index.js ✓ Edit

Check index.js with contents:

Ran GitHub Actions for e35241a2c43688fb0126865fc9f43fc8bee3a257:

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