Docs: Add a section to explain how to make it work with nextjs and/or webpack

[GiancarlosIO]

From Brooooooklyn/snappy#119

Hi there

I'm using nextjs and winston-loki which has snappy has a peerDependency, and I'm getting the following error:

error - ../../node_modules/.pnpm/@[email protected]/node_modules/@napi-rs/snappy-darwin-arm64/snappy.darwin-arm64.node
Module parse failed: Unexpected character '�' (1:0)
You may need an appropriate loader to handle this file type, currently, no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
(Source code omitted for this binary file)

Import trace for requested module:
../../node_modules/.pnpm/@[email protected]/node_modules/@napi-rs/snappy-darwin-arm64/snappy.darwin-arm64.node
../../node_modules/.pnpm/[email protected]/node_modules/snappy/index.js
../../node_modules/.pnpm/[email protected]/node_modules/winston-loki/src/batcher.js
../../node_modules/.pnpm/[email protected]/node_modules/winston-loki/index.js
../../packages/next/dist/logger/index.js
../../packages/next/logger/index.mjs
./src/views/Homepage/server/getServerSideProps.tsx
./src/views/Homepage/index.ts

I think the error is because nextjs/webpack doesn't know how to process a file with an extension .node.
Maybe we can add, in the readme file, a section about how to fix this problem? 🤔 I have found this webpack-loader but I don't know if this is the recommended way.

Update1:
After implementing the node-loader, now I get these errors:

Thanks.

SO: macOS
package manager: pnpm v7.18.0
winston: "v3.8.2",
winston-loki: "v6.0.6"
snappy: 7.1.1

Checklist

• Create src/snappyLoader.js ✓ 6926d0a Edit
• Running GitHub Actions for src/snappyLoader.js ✓ Edit
• Modify src/batcher.js ✓ e2dadcf Edit
• Running GitHub Actions for src/batcher.js ✓ Edit
• Modify README.md ✓ 0ddd1d5 Edit
• Running GitHub Actions for README.md ✓ Edit

[JaniAnttonen]

Since upgrading or downgrading the snappy dependency has helped in the past, I'm wondering if the newest release might help with this. Please report back if you can :)

[JaniAnttonen]

Thus, might be related: #137 #131

[mkermani144]

Upgrading to latest doesn't seem to fix the issue. Tested with 6.0.8.

[qcasey]

Might want to create two different releases with/without optional snappy dependency in the future. #131 (comment)

Removing snappy is working for me with NextJS: development...qcasey:winston-loki:development.

bun add [email protected]:qcasey/winston-loki.git#db13b4e83c8f7a66306e5bcfb1cc6192cabbd8dc and off to the races

[sweep-ai]

🚀 Here's the PR! #146

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winston-loki/README.md

Lines 1 to 58 in 88399c8

	# winston-loki
	[](https://badge.fury.io/js/winston-loki)
	[](https://packagephobia.now.sh/result?p=winston-loki)
	[](https://travis-ci.com/JaniAnttonen/winston-loki)
	[](https://coveralls.io/github/JaniAnttonen/winston-loki?branch=master)
	[](https://codeclimate.com/github/JaniAnttonen/winston-loki/maintainability)
	A Grafana Loki transport for the nodejs logging library Winston.
	## Usage
	This Winston transport is used similarly to other Winston transports. Require winston and define a new LokiTransport() inside its options when creating it.
	### [Examples](./examples/)
	Several usage examples with a test configuration for Grafana+Loki+Promtail reside under [`examples/`](./examples/). If you want the simplest possible configuration, that's probably the place to check out. By defining `json: true` and giving `winston-loki` the correct `host` address for Loki is enough for most.
	### Options
	LokiTransport() takes a Javascript object as an input. These are the options that are available, __required in bold__:
	| **Parameter** | **Description** | **Example** | **Default** |
	| ------------------ | --------------------------------------------------------- | -----------------------| ------------- |
	| __`host`__ | URL for Grafana Loki | http://127.0.0.1:3100 | null |
	| `interval` | The interval at which batched logs are sent in seconds | 30 | 5 |
	| `json` | Use JSON instead of Protobuf for transport | true | false |
	| `batching` | If batching is not used, the logs are sent as they come | true | true |
	| `clearOnError` | Discard any logs that result in an error during transport | true | false |
	| `replaceTimestamp` | Replace any log timestamps with Date.now() | true | false |
	| `labels` | custom labels, key-value pairs | { module: 'http' } | undefined |
	| `format` | winston format (https://github.com/winstonjs/winston#formats) | simple() | undefined |
	| `gracefulShutdown` | Enable/disable graceful shutdown (wait for any unsent batches) | false | true |
	| `timeout` | timeout for requests to grafana loki in ms | 30000 | undefined |
	| `basicAuth` | basic authentication credentials to access Loki over HTTP | username:password | undefined |
	| `onConnectionError`| Loki error connection handler | (err) => console.error(err) | undefined |
	### Example
	With default formatting:
	```js
	const { createLogger, transports } = require("winston");
	const LokiTransport = require("winston-loki");
	const options = {
	...,
	transports: [
	new LokiTransport({
	host: "http://127.0.0.1:3100"
	})
	]
	...
	};
	const logger = createLogger(options);
	```
	You can set custom labels in every log as well like this:
	```js
	logger.debug({ message: 'test', labels: { 'key': 'value' } })
	```
	TODO: Add custom formatting example

winston-loki/index.js

Lines 1 to 129 in 88399c8

	const Transport = require('winston-transport')
	const Batcher = require('./src/batcher')
	const { MESSAGE } = require('triple-beam')
	/**
	* A Winston transport for Grafana Loki.
	*
	* @class LokiTransport
	* @extends {Transport}
	*/
	class LokiTransport extends Transport {
	/**
	* Creates an instance of LokiTransport.
	* @param {*} options
	* @memberof LokiTransport
	*/
	constructor (options) {
	super(options)
	// Pass all the given options to batcher
	this.batcher = new Batcher({
	host: options.host,
	basicAuth: options.basicAuth,
	headers: options.headers || {},
	interval: options.interval,
	json: options.json,
	batching: options.batching !== false,
	clearOnError: options.clearOnError,
	onConnectionError: options.onConnectionError,
	replaceTimestamp: options.replaceTimestamp,
	gracefulShutdown: options.gracefulShutdown !== false,
	timeout: options.timeout
	})
	this.useCustomFormat = options.format !== undefined
	this.labels = options.labels
	}
	/**
	* An overwrite of winston-transport's log(),
	* which the Winston logging library uses
	* when pushing logs to a transport.
	*
	* @param {*} info
	* @param {*} callback
	* @memberof LokiTransport
	*/
	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()
	}
	/**
	* Flush unsent batched logs to Winston transport and return
	* a promise that resolves after response is received from
	* the transport. If some (batched or not) logs are being sent
	* at the time of call, the promise resolves after the transport
	* responds.
	*
	* As a result the promise returned resolves only when the transport
	* has confirmed receiving all the logs sent via log(), info(), etc
	* calls preceding the flush() call.
	*/
	async flush () {
	return await this.batcher.waitFlushed();
	}
	/**
	* Send batch to loki when clean up
	*/
	close () {
	this.batcher.close()
	}
	}

winston-loki/src/batcher.js

Lines 1 to 311 in 88399c8

	const exitHook = require('async-exit-hook')
	const { logproto } = require('./proto')
	const protoHelpers = require('./proto/helpers')
	const req = require('./requests')
	let snappy = false
	/**
	* A batching transport layer for Grafana Loki
	*
	* @class Batcher
	*/
	class Batcher {
	loadSnappy () {
	return require('snappy')
	}
	loadUrl () {
	let URL
	try {
	if (typeof window !== 'undefined' && window.URL) {
	URL = window.URL
	} else {
	URL = require('url').URL
	}
	} catch (_error) {
	URL = require('url-polyfill').URL
	}
	return URL
	}
	/**
	* Creates an instance of Batcher.
	* Starts the batching loop if enabled.
	* @param {*} options
	* @memberof Batcher
	*/
	constructor (options) {
	// Load given options to the object
	this.options = options
	// Construct Grafana Loki push API url
	const URL = this.loadUrl()
	this.url = new URL(this.options.host + '/loki/api/v1/push')
	// Parse basic auth parameters if given
	if (options.basicAuth) {
	const btoa = require('btoa')
	const basicAuth = 'Basic ' + btoa(options.basicAuth)
	this.options.headers = Object.assign(this.options.headers, { Authorization: basicAuth })
	}
	// Define the batching intervals
	this.interval = this.options.interval
	? Number(this.options.interval) * 1000
	: 5000
	this.circuitBreakerInterval = 60000
	// Initialize the log batch
	this.batch = {
	streams: []
	}
	// If snappy binaries have not been built, fallback to JSON transport
	if (!this.options.json) {
	try {
	snappy = this.loadSnappy()
	} catch (error) {
	this.options.json = true
	}
	if (!snappy) {
	this.options.json = true
	}
	}
	// Define the content type headers for the POST request based on the data type
	this.contentType = 'application/x-protobuf'
	if (this.options.json) {
	this.contentType = 'application/json'
	}
	this.batchesSending = 0
	this.onBatchesFlushed = () => {}
	// If batching is enabled, run the loop
	this.options.batching && this.run()
	if (this.options.gracefulShutdown) {
	exitHook(callback => {
	this.close(() => callback())
	})
	}
	}
	/**
	* Marks the start of batch submitting.
	*
	* Must be called right before batcher starts sending logs.
	*/
	batchSending () {
	this.batchesSending++
	}
	/**
	* Marks the end of batch submitting
	*
	* Must be called after the response from Grafana Loki push endpoint
	* is received and completely processed, right before
	* resolving/rejecting the promise.
	*/
	batchSent () {
	if (--this.batchesSending) return
	this.onBatchesFlushed()
	}
	/**
	* Returns a promise that resolves after all the logs sent before
	* via log(), info(), etc calls are sent to Grafana Loki push endpoint
	* and the responses for all of them are received and processed.
	*
	* @returns {Promise}
	*/
	waitFlushed () {
	return new Promise((resolve, reject) => {
	if (!this.batchesSending && !this.batch.streams.length) { return resolve() }
	this.onBatchesFlushed = () => {
	this.onBatchesFlushed = () => {}
	return resolve()
	}
	})
	}
	/**
	* Returns a promise that resolves after the given duration.
	*
	* @param {*} duration
	* @returns {Promise}
	*/
	wait (duration) {
	return new Promise(resolve => {
	setTimeout(resolve, duration)
	})
	}
	/**
	* Pushes logs into the batch.
	* If logEntry is given, pushes it straight to this.sendBatchToLoki()
	*
	* @param {*} logEntry
	*/
	async pushLogEntry (logEntry) {
	const noTimestamp =
	logEntry && logEntry.entries && logEntry.entries[0].ts === undefined
	// If user has decided to replace the given timestamps with a generated one, generate it
	if (this.options.replaceTimestamp || noTimestamp) {
	logEntry.entries[0].ts = Date.now()
	}
	// If protobuf is the used data type, construct the timestamps
	if (!this.options.json) {
	logEntry = protoHelpers.createProtoTimestamps(logEntry)
	}
	// If batching is not enabled, push the log immediately to Loki API
	if (this.options.batching !== undefined && !this.options.batching) {
	await this.sendBatchToLoki(logEntry)
	} else {
	const { streams } = this.batch
	// Find if there's already a log with identical labels in the batch
	const match = streams.findIndex(
	stream => JSON.stringify(stream.labels) === JSON.stringify(logEntry.labels)
	)
	if (match > -1) {
	// If there's a match, push the log under the same label
	logEntry.entries.forEach(entry => {
	streams[match].entries.push(entry)
	})
	} else {
	// Otherwise, create a new label under streams
	streams.push(logEntry)
	}
	}
	}
	/**
	* Clears the batch.
	*/
	clearBatch () {
	this.batch.streams = []
	}
	/**
	* Sends a batch to Grafana Loki push endpoint.
	* If a single logEntry is given, creates a batch first around it.
	*
	* @param {*} logEntry
	* @returns {Promise}
	*/
	sendBatchToLoki (logEntry) {
	this.batchSending()
	return new Promise((resolve, reject) => {
	// If the batch is empty, do nothing
	if (this.batch.streams.length === 0 && !logEntry) {
	this.batchSent()
	resolve()
	} else {
	let reqBody
	// If the data format is JSON, there's no need to construct a buffer
	if (this.options.json) {
	let preparedJSONBatch
	if (logEntry !== undefined) {
	// If a single logEntry is given, wrap it according to the batch format
	preparedJSONBatch = protoHelpers.prepareJSONBatch({ streams: [logEntry] })
	} else {
	// Stringify the JSON ready for transport
	preparedJSONBatch = protoHelpers.prepareJSONBatch(this.batch)
	}
	reqBody = JSON.stringify(preparedJSONBatch)
	} else {
	try {
	let batch
	if (logEntry !== undefined) {
	// If a single logEntry is given, wrap it according to the batch format
	batch = { streams: [logEntry] }
	} else {
	batch = this.batch
	}
	const preparedBatch = protoHelpers.prepareProtoBatch(batch)
	// Check if the batch can be encoded in Protobuf and is correct format
	const err = logproto.PushRequest.verify(preparedBatch)
	// Reject the promise if the batch is not of correct format
	if (err) reject(err)
	// Create the PushRequest object
	const message = logproto.PushRequest.create(preparedBatch)
	// Encode the PushRequest object and create the binary buffer
	const buffer = logproto.PushRequest.encode(message).finish()
	// Compress the buffer with snappy
	reqBody = snappy.compressSync(buffer)
	} catch (err) {
	this.batchSent()
	reject(err)
	}
	}
	// Send the data to Grafana Loki
	req.post(this.url, this.contentType, this.options.headers, reqBody, this.options.timeout)
	.then(() => {
	// No need to clear the batch if batching is disabled
	logEntry === undefined && this.clearBatch()
	this.batchSent()
	resolve()
	})
	.catch(err => {
	// Clear the batch on error if enabled
	this.options.clearOnError && this.clearBatch()
	this.options.onConnectionError !== undefined && this.options.onConnectionError(err)
	this.batchSent()
	reject(err)
	})
	}
	})
	}
	/**
	* Runs the batch push loop.
	*
	* Sends the batch to Loki and waits for
	* the amount of this.interval between requests.
	*/
	async run () {
	this.runLoop = true
	while (this.runLoop) {
	try {
	await this.sendBatchToLoki()
	if (this.interval === this.circuitBreakerInterval) {
	if (this.options.interval !== undefined) {
	this.interval = Number(this.options.interval) * 1000
	} else {
	this.interval = 5000
	}
	}
	} catch (e) {
	this.interval = this.circuitBreakerInterval
	}
	await this.wait(this.interval)
	}
	}
	/**
	* Stops the batch push loop
	*
	* @param {() => void} [callback]
	*/
	close (callback) {
	this.runLoop = false
	this.sendBatchToLoki()
	.then(() => { if (callback) { callback() } }) // maybe should emit something here
	.catch(() => { if (callback) { callback() } }) // maybe should emit something here
	}
	}

---

Step 2: ⌨️ Coding

• Create src/snappyLoader.js ✓ 6926d0a Edit

Create src/snappyLoader.js with contents:
• Create a new file `src/snappyLoader.js` to encapsulate the logic for conditionally loading `snappy`.
• Inside `src/snappyLoader.js`, export a function `loadSnappy` that tries to require `snappy` and catches any errors. If an error occurs, log a warning message indicating that `snappy` could not be loaded and that the library will fall back to JSON transport. Return `null` if `snappy` cannot be loaded.
• This approach allows `src/batcher.js` to attempt to load `snappy` in a safe manner, avoiding crashes in environments where `.node` files cannot be processed by Webpack.

• Running GitHub Actions for src/snappyLoader.js ✓ Edit

Check src/snappyLoader.js with contents:

Ran GitHub Actions for 6926d0ae83469ad2dac3e14d3afc34fe13de1bd1:

• Modify src/batcher.js ✓ e2dadcf Edit

Modify src/batcher.js with contents:
• Import the `loadSnappy` function from the newly created `src/snappyLoader.js`.
• Replace the direct call to `require('snappy')` in the `loadSnappy` method within `src/batcher.js` with a call to the imported `loadSnappy` function. This change ensures that `snappy` is loaded conditionally, avoiding the issue when running in environments like Next.js.
• Remove the try-catch block around the `require('snappy')` since the error handling will now be managed within `src/snappyLoader.js`.

--- 
+++ 
@@ -2,6 +2,7 @@
 const { logproto } = require('./proto')
 const protoHelpers = require('./proto/helpers')
 const req = require('./requests')
+const { loadSnappy } = require('./snappyLoader')
 let snappy = false
 
 /**
@@ -11,7 +12,7 @@
  */
 class Batcher {
   loadSnappy () {
-    return require('snappy')
+    return loadSnappy()
   }
 
   loadUrl () {

• Running GitHub Actions for src/batcher.js ✓ Edit

Check src/batcher.js with contents:

Ran GitHub Actions for e2dadcf1d9dce866f8962f274288c2dcdff22feb:

• Modify README.md ✓ 0ddd1d5 Edit

Modify README.md with contents:
• Add a new section titled "Using with Next.js and Webpack" after the "Usage" section.
• In this new section, explain that `winston-loki` can be used with Next.js and Webpack-based projects. Highlight that the library attempts to load `snappy` for performance but will fall back to JSON transport if `snappy` cannot be loaded, which may happen in some Webpack configurations.
• Mention that no additional Webpack configuration should be necessary for most users, but if issues arise related to `.node` files, users should ensure their Webpack version and configuration support loading of such files, or consider using the library in environments where native addons are supported.
• This update provides clarity and guidance for users attempting to integrate `winston-loki` with Next.js and Webpack, ensuring they are aware of potential issues and solutions.

--- 
+++ 
@@ -31,6 +31,11 @@
 | `timeout`          | timeout for requests to grafana loki in ms                | 30000                  | undefined     | 
 | `basicAuth`        | basic authentication credentials to access Loki over HTTP | username:password      | undefined     | 
 | `onConnectionError`| Loki error connection handler                        | (err) => console.error(err) | undefined     | 
+
+### Using with Next.js and Webpack
+`winston-loki` can be seamlessly integrated with Next.js and Webpack-based projects. The library attempts to load `snappy` for enhanced performance. However, in scenarios where `snappy` cannot be loaded, such as certain Webpack configurations that do not support `.node` files, `winston-loki` will automatically fall back to using JSON transport. This ensures compatibility across different environments without requiring additional configuration.
+
+For most users, no extra steps will be necessary to use `winston-loki` with Next.js and Webpack. However, if you encounter issues related to loading `.node` files, please ensure that your Webpack version and configuration are set up to support such files. Alternatively, consider using `winston-loki` in environments where native addons are supported, to leverage the full capabilities of the library.
 
 ### Example
 With default formatting:

• Running GitHub Actions for README.md ✓ Edit

Check README.md with contents:

Ran GitHub Actions for 0ddd1d5287e385342053f237dc09d5913921da6f:

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