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104 lines
2.5 KiB
Markdown
104 lines
2.5 KiB
Markdown
# why-is-node-running
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Node is running but you don't know why? `why-is-node-running` is here to help you.
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## Installation
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Node 8 and above:
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```bash
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npm i why-is-node-running -g
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```
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Earlier Node versions (no longer supported):
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```bash
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npm i why-is-node-running@v1.x -g
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```
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## Usage
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```js
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const log = require('why-is-node-running') // should be your first require
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const net = require('net')
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function createServer () {
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const server = net.createServer()
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setInterval(function () {}, 1000)
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server.listen(0)
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}
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createServer()
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createServer()
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setTimeout(function () {
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log() // logs out active handles that are keeping node running
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}, 100)
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```
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Save the file as `example.js`, then execute:
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```bash
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node ./example.js
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```
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Here's the output:
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```
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There are 5 handle(s) keeping the process running
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# Timeout
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/home/maf/dev/node_modules/why-is-node-running/example.js:6 - setInterval(function () {}, 1000)
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/home/maf/dev/node_modules/why-is-node-running/example.js:10 - createServer()
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# TCPSERVERWRAP
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/home/maf/dev/node_modules/why-is-node-running/example.js:7 - server.listen(0)
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/home/maf/dev/node_modules/why-is-node-running/example.js:10 - createServer()
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# Timeout
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/home/maf/dev/node_modules/why-is-node-running/example.js:6 - setInterval(function () {}, 1000)
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/home/maf/dev/node_modules/why-is-node-running/example.js:11 - createServer()
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# TCPSERVERWRAP
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/home/maf/dev/node_modules/why-is-node-running/example.js:7 - server.listen(0)
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/home/maf/dev/node_modules/why-is-node-running/example.js:11 - createServer()
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# Timeout
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/home/maf/dev/node_modules/why-is-node-running/example.js:13 - setTimeout(function () {
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```
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**Important Note!**
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`unref`ed timers do not prevent the Node process from exiting. If you are running with Node v11.0.0 and above, `unref`ed timers will not be listed in the above list. Unfortunately, this is not supported in node versions below v11.0.0.
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## CLI
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You can also run `why-is-node-running` as a standalone if you don't want to include it inside your code. Sending `SIGUSR1`/`SIGINFO` signal to the process will produce the log. (`Ctrl + T` on macOS and BSD systems)
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```bash
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why-is-node-running /path/to/some/file.js
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```
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```
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probing module /path/to/some/file.js
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kill -SIGUSR1 31115 for logging
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```
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To trigger the log:
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```
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kill -SIGUSR1 31115
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```
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## Require CLI Option
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You can also use the node `-r` option to include `why-is-node-running`:
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```bash
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node -r why-is-node-running/include /path/to/some/file.js
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```
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The steps are otherwise the same as the above CLI section
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## License
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MIT
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