125 lines
4.1 KiB
Markdown
125 lines
4.1 KiB
Markdown
|
# get-stream
|
||
|
|
|
||
|
|
> Get a stream as a string, buffer, or array
|
||
|
|
|
||
|
|
## Install
|
||
|
|
|
||
|
|
```
|
||
|
|
$ npm install get-stream
|
||
|
|
```
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
```js
|
||
|
|
const fs = require('fs');
|
||
|
|
const getStream = require('get-stream');
|
||
|
|
|
||
|
|
(async () => {
|
||
|
|
const stream = fs.createReadStream('unicorn.txt');
|
||
|
|
|
||
|
|
console.log(await getStream(stream));
|
||
|
|
/*
|
||
|
|
,,))))))));,
|
||
|
|
__)))))))))))))),
|
||
|
|
\|/ -\(((((''''((((((((.
|
||
|
|
-*-==//////(('' . `)))))),
|
||
|
|
/|\ ))| o ;-. '((((( ,(,
|
||
|
|
( `| / ) ;))))' ,_))^;(~
|
||
|
|
| | | ,))((((_ _____------~~~-. %,;(;(>';'~
|
||
|
|
o_); ; )))(((` ~---~ `:: \ %%~~)(v;(`('~
|
||
|
|
; ''''```` `: `:::|\,__,%% );`'; ~
|
||
|
|
| _ ) / `:|`----' `-'
|
||
|
|
______/\/~ | / /
|
||
|
|
/~;;.____/;;' / ___--,-( `;;;/
|
||
|
|
/ // _;______;'------~~~~~ /;;/\ /
|
||
|
|
// | | / ; \;;,\
|
||
|
|
(<_ | ; /',/-----' _>
|
||
|
|
\_| ||_ //~;~~~~~~~~~
|
||
|
|
`\_| (,~~
|
||
|
|
\~\
|
||
|
|
~~
|
||
|
|
*/
|
||
|
|
})();
|
||
|
|
```
|
||
|
|
|
||
|
|
## API
|
||
|
|
|
||
|
|
The methods returns a promise that resolves when the `end` event fires on the stream, indicating that there is no more data to be read. The stream is switched to flowing mode.
|
||
|
|
|
||
|
|
### getStream(stream, options?)
|
||
|
|
|
||
|
|
Get the `stream` as a string.
|
||
|
|
|
||
|
|
#### options
|
||
|
|
|
||
|
|
Type: `object`
|
||
|
|
|
||
|
|
##### encoding
|
||
|
|
|
||
|
|
Type: `string`\
|
||
|
|
Default: `'utf8'`
|
||
|
|
|
||
|
|
[Encoding](https://nodejs.org/api/buffer.html#buffer_buffer) of the incoming stream.
|
||
|
|
|
||
|
|
##### maxBuffer
|
||
|
|
|
||
|
|
Type: `number`\
|
||
|
|
Default: `Infinity`
|
||
|
|
|
||
|
|
Maximum length of the returned string. If it exceeds this value before the stream ends, the promise will be rejected with a `getStream.MaxBufferError` error.
|
||
|
|
|
||
|
|
### getStream.buffer(stream, options?)
|
||
|
|
|
||
|
|
Get the `stream` as a buffer.
|
||
|
|
|
||
|
|
It honors the `maxBuffer` option as above, but it refers to byte length rather than string length.
|
||
|
|
|
||
|
|
### getStream.array(stream, options?)
|
||
|
|
|
||
|
|
Get the `stream` as an array of values.
|
||
|
|
|
||
|
|
It honors both the `maxBuffer` and `encoding` options. The behavior changes slightly based on the encoding chosen:
|
||
|
|
|
||
|
|
- When `encoding` is unset, it assumes an [object mode stream](https://nodesource.com/blog/understanding-object-streams/) and collects values emitted from `stream` unmodified. In this case `maxBuffer` refers to the number of items in the array (not the sum of their sizes).
|
||
|
|
|
||
|
|
- When `encoding` is set to `buffer`, it collects an array of buffers. `maxBuffer` refers to the summed byte lengths of every buffer in the array.
|
||
|
|
|
||
|
|
- When `encoding` is set to anything else, it collects an array of strings. `maxBuffer` refers to the summed character lengths of every string in the array.
|
||
|
|
|
||
|
|
## Errors
|
||
|
|
|
||
|
|
If the input stream emits an `error` event, the promise will be rejected with the error. The buffered data will be attached to the `bufferedData` property of the error.
|
||
|
|
|
||
|
|
```js
|
||
|
|
(async () => {
|
||
|
|
try {
|
||
|
|
await getStream(streamThatErrorsAtTheEnd('unicorn'));
|
||
|
|
} catch (error) {
|
||
|
|
console.log(error.bufferedData);
|
||
|
|
//=> 'unicorn'
|
||
|
|
}
|
||
|
|
})()
|
||
|
|
```
|
||
|
|
|
||
|
|
## FAQ
|
||
|
|
|
||
|
|
### How is this different from [`concat-stream`](https://github.com/maxogden/concat-stream)?
|
||
|
|
|
||
|
|
This module accepts a stream instead of being one and returns a promise instead of using a callback. The API is simpler and it only supports returning a string, buffer, or array. It doesn't have a fragile type inference. You explicitly choose what you want. And it doesn't depend on the huge `readable-stream` package.
|
||
|
|
|
||
|
|
## Related
|
||
|
|
|
||
|
|
- [get-stdin](https://github.com/sindresorhus/get-stdin) - Get stdin as a string or buffer
|
||
|
|
|
||
|
|
---
|
||
|
|
|
||
|
|
<div align="center">
|
||
|
|
<b>
|
||
|
|
<a href="https://tidelift.com/subscription/pkg/npm-get-stream?utm_source=npm-get-stream&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
|
||
|
|
</b>
|
||
|
|
<br>
|
||
|
|
<sub>
|
||
|
|
Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
|
||
|
|
</sub>
|
||
|
|
</div>
|