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105 lines
3.0 KiB
105 lines
3.0 KiB
# exit-on-epipe
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Cleanly exit on pipe errors in NodeJS scripts.
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NOTE: The underlying problem was addressed in 8.x NodeJS versions but the fix
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was not backported to 6.x and other versions of NodeJS.
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These errors are common in pipelines that involve NodeJS scripts. For example,
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take a simple script that prints out 10 lines:
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```js
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for(var i = 0; i < 10; ++i) console.log(i)
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```
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NodeJS will print an error message if the output is truncated:
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```bash
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$ cat t.js
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for(var i = 0; i < 10; ++i) console.log(i)
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$ node --version
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v6.11.1
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$ node t.js | head -n 1
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0
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events.js:160
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throw er; // Unhandled 'error' event
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^
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Error: write EPIPE
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at exports._errnoException (util.js:1018:11)
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at WriteWrap.afterWrite (net.js:800:14)
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```
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The process will cleanly exit if you require the module:
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```bash
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$ cat t.js
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require("exit-on-epipe");
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for(var i = 0; i < 10; ++i) console.log(i)
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$ node t.js | head -n 1
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0
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```
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## Installation
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With [npm](https://www.npmjs.org/package/exit-on-epipe):
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```bash
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$ npm install exit-on-epipe
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```
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## Usage
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For basic scripts, requiring at the top of the source file suffices:
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```js
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require('exit-on-epipe');
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// ... rest of source
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```
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For more advanced situations (e.g. handing other streams), call the module:
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```js
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var eoepipe = require('exit-on-epipe');
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eoepipe(stream); // will exit process on an EPIPE error on stream
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eoepipe(stream, handler); // will call handler() instead of process.exit
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```
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## Interface
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The module exports a single function (exposed as the variable `eoepipe`).
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`eoepipe(stream, bail)` will attach an error handler to `stream` which will:
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- call the `bail` function if the error `.code` is `"EPIPE"` or `.errno` is `32`
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- defer to the default behavior if there are no other error handlers
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- noop if the error is not `EPIPE` and if there are other error handlers
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If the `bail` function is not specified, `process.exit` is used.
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If the `stream` parameter is not specified, no action will be taken
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## Notes
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The script will not perform any action if `process` or `process.stdout` are not
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available. It is safe to use in a web page.
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## License
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Please consult the attached LICENSE file for details. All rights not explicitly
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granted by the Apache 2.0 license are reserved by the Original Author.
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## Badges
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[](https://travis-ci.org/SheetJS/node-exit-on-epipe)
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[](https://npmjs.org/package/exit-on-epipe)
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[](https://npmjs.org/package/exit-on-epipe)
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[](https://david-dm.org/sheetjs/node-exit-on-epipe)
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[](https://ghit.me/repo/sheetjs/node-exit-on-epipe)
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[](https://github.com/SheetJS/node-exit-on-epipe)
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