# Loopbusy

Middleware to send 503s and keep your server alive when it's too busy to queue more requests.

```js
var app = express();

app
  .use(loopbusy())
  .get('/', function sendOk(req, res, next) {
    res.send('ok');
  })
  .use(function handleErrors(err, req, res, next) {
    res.status(err.status).send('err');
  });
```

Loopbusy uses the [event-loop-lag](https://github.com/pebble/event-loop-lag)
module to determine when the event loop is piling up requests.

When lag passes a threshold, loopbusy passes 503 errors
to your middleware stack so your app can stay alive for some users
instead of falling over for all users.

## Options

```js
loopbusy(maxLag, pollingInterval);
```

### Max Lag

```js
loopbusy(500);
```

The maximum lag (in ms) of your event loop.

Defaults to 250.

### Interval

```js
loopbusy(null, 3000);
```

The polling interval (in ms) for measuring your event loop.
Shorter values catch business faster at the cost of
additional overhead.

Defaults to 1000.

## Tests

```js
npm test
```


Middleware to send 503s and keep your server alive when it's too busy to queue more requests. 

Supply Chain Attack on Axios Pulls Malicious Dependency from npm

loopbusy

Middleware to send 503s and keep your server alive when it's too busy to queue more requests

hunterloftis

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Bad semver

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Bad dependency semver

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Bidirectional unicode control characters

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What is bin script confusion?

Bin script confusion

This Chrome extension includes content scripts that execute JavaScript on specified websites.

What are Chrome extension content scripts?

Chrome: Content Script

This Chrome extension requests host permissions to access specific websites or domains.

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Chrome: Host Permission

This Chrome extension requests permissions to access browser APIs, user data, or system features.

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Chrome: Permission

This Chrome extension requests wildcard host permissions that grant broad access to websites.

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Chrome: Wildcard Host Permission

Semantic versions published out of chronological order.

What is a chronological version anomaly?

Chronological version anomaly

Project maintainer's SSH key has been compromised.

What is a compromised SSH key?

Compromised SSH key

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

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Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

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High CVE

Uses debug, reflection and dynamic code execution features.

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Debug access

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Deprecated

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Deprecated SPDX exception

License is deprecated which may have legal implications regarding the package's use.

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Deprecated license

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Possible typosquat attack

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Dynamic require

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Empty package

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Environment variable access

Something was found which is explicitly marked as unlicensed.

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Package optionally loads a dependency which is not specified within any of the package.json dependency fields. It may inadvertently be importing dependencies specified by other packages.

What are extraneous dependencies?

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File dependency

Accesses the file system, and could potentially read sensitive data.

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Filesystem access

Package has a dependency with a floating version range. This can cause issues if the dependency publishes a new major version.

What are wildcard dependencies?

Wildcard dependency

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An input argument to this GitHub Action is being passed back as an output. If a user of this action passes untrusted input, it could be used in an insecure manner by consuming workflows.

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An input argument to this GitHub Action flows into a dangerous sink (such as shell command execution). This could allow a malicious user to inject commands or exploit the action.

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A GitHub context variable (such as issue title, PR description, or comment body) is being exported as an environment variable. These context values are user-controlled and could be exploited by subsequent workflow steps.

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GitHub Actions: Environment variable flows to dangerous sink

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Git dependency

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AI-detected possible typosquat

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AI-detected potential malware

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AI-detected potential security risk

Contains native code (e.g., compiled binaries or shared libraries). Including native code can obscure malicious behavior.

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Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

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High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

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Unicode homoglyphs

Contains a dependency which resolves to a remote HTTP URL which could be used to inject untrusted code and reduce overall package reliability.

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HTTP dependency

Install scripts are run when the package is installed or built. Malicious packages often use scripts that run automatically to execute payloads or fetch additional code.

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Install scripts

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Invalid manifest file

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Invisible chars

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Long strings

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Major refactor

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Missing package tarball

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Modified license exception

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Modified license

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Network access

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

loopbusy

Loopbusy

Options

Max Lag

Interval

Tests

Keywords

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loopbusy

Loopbusy

Options

Max Lag

Interval

Tests

Keywords

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