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https://github.com/yoshuawuyts/hyperreduce
Distributed reduce on top of hypercore
https://github.com/yoshuawuyts/hyperreduce
Last synced: 2 days ago
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Distributed reduce on top of hypercore
- Host: GitHub
- URL: https://github.com/yoshuawuyts/hyperreduce
- Owner: yoshuawuyts
- License: mit
- Created: 2016-11-03T14:42:36.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2016-11-05T16:28:29.000Z (about 8 years ago)
- Last Synced: 2024-10-24T00:24:10.704Z (16 days ago)
- Language: JavaScript
- Size: 5.86 KB
- Stars: 17
- Watchers: 4
- Forks: 4
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-peer-to-peer - hyperreduce
- awesome-peer-to-peer - hyperreduce
README
# hyperreduce [![stability][0]][1]
[![npm version][2]][3] [![build status][4]][5]
[![downloads][8]][9] [![js-standard-style][10]][11]
Distributed reduce on top of hypercore.
## Usage
```js
const hypercore = require('hypercore')
const memdb = require('memdb')
const reduce = require('./')
const core = hypercore(memdb())
const inp = core.createFeed()
const head = reduce(inp, memdb({ valueEncoding: 'json' }), reducer)
head(function (err, last) {
if (err) throw err
console.log('head:', last || 'no data')
})
function reducer (last, data, next) {
last = last || 0
console.log('last:', last)
next(null, last + data.length)
}
inp.append('hello planet')
inp.append('hello planet')
inp.append('hello planet')
```
## Why
We believe ops doesn't need to be complicated. If `hypercore` is distributed
streams, `hyperreduce` is a distributed reducer for streams. We needed this to
to turn our feed of server errors into a single meaningful value.
## API
### getLasthyperReduce(inputFeed, db, reducer(last, data, next), done?)
Create a new reduce function that reads data from an input `hypercore` feed to
and applies the `reducer` function.
### getLast(cb(err, last))
Get the last value from `hyperreduce`.
## Installation
```sh
$ npm install hyperreduce
```
## See Also
- https://github.com/mafintosh/hypercore
- https://github.com/mafintosh/hyperpipe
- https://github.com/mafintosh/hypername
- https://github.com/mafintosh/hyperfilter
- https://github.com/yoshuawuyts/hypertail
## License
[MIT](https://tldrlegal.com/license/mit-license)
[0]: https://img.shields.io/badge/stability-experimental-orange.svg?style=flat-square
[1]: https://nodejs.org/api/documentation.html#documentation_stability_index
[2]: https://img.shields.io/npm/v/hyperreduce.svg?style=flat-square
[3]: https://npmjs.org/package/hyperreduce
[4]: https://img.shields.io/travis/yoshuawuyts/hyperreduce/master.svg?style=flat-square
[5]: https://travis-ci.org/yoshuawuyts/hyperreduce
[6]: https://img.shields.io/codecov/c/github/yoshuawuyts/hyperreduce/master.svg?style=flat-square
[7]: https://codecov.io/github/yoshuawuyts/hyperreduce
[8]: http://img.shields.io/npm/dm/hyperreduce.svg?style=flat-square
[9]: https://npmjs.org/package/hyperreduce
[10]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square
[11]: https://github.com/feross/standard