Endless batching until out of memory if request to grafana loki won't hang up

[johakr]

If the request to grafana loki get's stuck for whatever reason, winston-loki will batch the logs until we run out of memory, since we don't have any timeout on our request defined.

As a first step I created a PR to make the timeout configurable: https://github.com/JaniAnttonen/winston-loki/pull/55

We might want to discuss if there is a sensible timeout we want to set as a default value.

Checklist

• [X] Modify src/requests.js ! No changes made Edit
• [X] Running GitHub Actions for src/requests.js ✗ Edit
• [X] Modify src/batcher.js ! No changes made Edit
• [X] Running GitHub Actions for src/batcher.js ✗ Edit
• [X] Modify index.js ! No changes made Edit
• [X] Running GitHub Actions for index.js ✗ Edit
• [X] Modify index.d.ts ✓ https://github.com/JaniAnttonen/winston-loki/commit/e9bd74ab51e90f5a0202587a1eff7dca5d1ccb06 Edit
• [X] Running GitHub Actions for index.d.ts ✓ Edit
• [X] Modify README.md ! No changes made Edit
• [X] Running GitHub Actions for README.md ✗ Edit

[JaniAnttonen]

10 seconds is the one I've seen used most. Might want to add that on a later date as the default.

[sweep-ai[bot]]

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Step 1: 🔎 Searching

I found the following snippets in your repository. I will now analyze these snippets and come up with a plan.

Some code snippets I think are relevant in decreasing order of relevance (click to expand). If some file is missing from here, you can mention the path in the ticket description.

https://github.com/JaniAnttonen/winston-loki/blob/88399c802eea00f3c9115cf680ea80058e12e9f6/src/requests.js#L1-L45

https://github.com/JaniAnttonen/winston-loki/blob/88399c802eea00f3c9115cf680ea80058e12e9f6/src/batcher.js#L1-L311

https://github.com/JaniAnttonen/winston-loki/blob/88399c802eea00f3c9115cf680ea80058e12e9f6/index.js#L1-L129

https://github.com/JaniAnttonen/winston-loki/blob/88399c802eea00f3c9115cf680ea80058e12e9f6/index.d.ts#L1-L23

https://github.com/JaniAnttonen/winston-loki/blob/88399c802eea00f3c9115cf680ea80058e12e9f6/README.md#L1-L59

I also found that you mentioned the following Pull Requests that may be helpful:

The following PRs were mentioned in the issue:

Pull Request #55

Title: feat: configurable timeout

Summary:

Make the timeout for the requests to grafana loki configurable.

Here is the diff of the Pull Request:

Diffs for file README.md:

@@ -36,6 +36,7 @@ LokiTransport() takes a Javascript object as an input. These are the options tha
 | `labels`           | custom labels, key-value pairs                            | { module: 'http' }     | null          |
 | `format`           | winston format (https://github.com/winstonjs/winston#formats) | simple()           | null          |
 | `gracefulShutdown` | Enable/disable graceful shutdown (wait for any unsent batches) | false             | true          |
+| `timeout`          | timeout for requests to grafana loki in ms                | 30000                  | null          | 
 
 ### Example
 With default formatting:

Diffs for file index.d.ts:

@@ -11,7 +11,8 @@ declare interface LokiTransportOptions extends TransportStream.TransportStreamOp
     clearOnError?: boolean,
     replaceOnError?: boolean,
     replaceTimestamp?: boolean,
-    gracefulShutdown?: boolean
+    gracefulShutdown?: boolean,
+    timeout?: number,
 }
 
 declare class LokiTransport extends TransportStream {

Diffs for file index.js:

@@ -28,7 +28,8 @@ class LokiTransport extends Transport {
       clearOnError: options.clearOnError,
       replaceOnError: options.replaceOnError,
       replaceTimestamp: options.replaceTimestamp,
-      gracefulShutdown: options.gracefulShutdown !== false
+      gracefulShutdown: options.gracefulShutdown !== false,
+      timeout: options.timeout
     })
 
     this.useCustomFormat = options.format !== undefined

Diffs for file src/batcher.js:

@@ -192,7 +192,7 @@ class Batcher {
         }
 
         // Send the data to Grafana Loki
-        req.post(this.url, this.contentType, this.options.headers, reqBody)
+        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()

Diffs for file src/requests.js:

@@ -1,7 +1,7 @@
 const http = require('http')
 const https = require('https')
 
-const post = async (lokiUrl, contentType, headers = {}, data = '') => {
+const post = async (lokiUrl, contentType, headers = {}, data = '', timeout) => {
   // Construct a buffer from the data string to have deterministic data size
   const dataBuffer = Buffer.from(data, 'utf8')
 
@@ -21,7 +21,8 @@ const post = async (lokiUrl, contentType, headers = {}, data = '') => {
       port: lokiUrl.port !== '' ? lokiUrl.port : (lokiUrl.protocol === 'https:' ? 443 : 80),
       path: lokiUrl.pathname,
       method: 'POST',
-      headers: Object.assign(defaultHeaders, headers)
+      headers: Object.assign(defaultHeaders, headers),
+      timeout: timeout
     }
 
     // Construct the request

Be sure to follow the PRs as a reference when making code changes. If the user instructs you to follow the referenced PR, limit the scope of your changes to the referenced PR.

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Step 2: ⌨️ Coding

• [X] Modify src/requests.js ! No changes made Edit

Modify src/requests.js with contents:
• Add a new parameter `timeout` to the `post` function signature.
• In the options object passed to `lib.request`, add a new key-value pair `timeout: timeout` to utilize the passed timeout value for the request.
• This modification allows setting a timeout for HTTP/HTTPS requests, ensuring they do not hang indefinitely.

• [X] Running GitHub Actions for src/requests.js ✗ Edit

Check src/requests.js with contents:

• [X] Modify src/batcher.js ! No changes made Edit

Modify src/batcher.js with contents:
• In the `sendBatchToLoki` function, update the call to `req.post` to include `this.options.timeout` as the last argument.
• This modification ensures that the timeout configuration is passed to the `post` function in requests.js, applying the timeout to each batched request.

• [X] Running GitHub Actions for src/batcher.js ✗ Edit

Check src/batcher.js with contents:

• [X] Modify index.js ! No changes made Edit

Modify index.js with contents:
• In the constructor of the `LokiTransport` class, add `timeout: options.timeout` to the options object passed to the `Batcher` constructor.
• This modification ensures that the timeout option provided to `LokiTransport` is passed to the `Batcher`, making it available for use in requests.

• [X] Running GitHub Actions for index.js ✗ Edit

Check index.js with contents:

• [X] Modify index.d.ts ✓ https://github.com/JaniAnttonen/winston-loki/commit/e9bd74ab51e90f5a0202587a1eff7dca5d1ccb06 Edit

Modify index.d.ts with contents:
• In the `LokiTransportOptions` interface, add a new optional property `timeout?: number`.
• This modification allows TypeScript users to specify the timeout option when using the `LokiTransport` class.

--- 
+++ 
@@ -12,6 +12,7 @@
     replaceTimestamp?: boolean,
     gracefulShutdown?: boolean,
     timeout?: number,
+    timeout?: number,
     onConnectionError?(error: unknown): void
 }
 

• [X] Running GitHub Actions for index.d.ts ✓ Edit

Check index.d.ts with contents:

Ran GitHub Actions for e9bd74ab51e90f5a0202587a1eff7dca5d1ccb06:

• [X] Modify README.md ! No changes made Edit

Modify README.md with contents:
• Update the Options section to include the new `timeout` option, specifying that it configures the timeout for requests to Grafana Loki in milliseconds. Mention that there is no default value set, and it's up to the user to specify one if desired.
• This modification informs users of the new timeout configuration option and how to use it.

• [X] Running GitHub Actions for README.md ✗ Edit

Check README.md with contents:

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