rxserver
A node server using rxjs
Last updated 2 years ago by jan-jan .
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rxserver

This is a simple tiny http server for node. It uses a functional/reactive approach to be as simple as possible.

This server has the absolute minimal unique API, so that it is easy to use for beginners (i.e, without needing to learn a complex framework). While, advanced users can call on the full power of rxjs to adapt the system to their needs.

This also means that testing should be very easy, as the majority of your code should be simple functions that only include business logic.

This library was inspired by Building REST APIs with Observables and Node server with Rx and Cycle.js.

Installation

npm install --save rxserver

Getting started

Creating your first server is as easy as

const createServerCallbacks = require('rxserver').createServerCallbacks

const { httpServerCallback } = createServerCallbacks()

const hostname = '127.0.0.1'
const port = 1337

http.createServer(httpServerCallback)
  .listen(port, hostname, () => {
    console.log(`Server running at http://${hostname}:${port}/`)
  })

Because we don't have any routes setup, a curl http://127.0.0.1:1337/ will respond with

{"error":"url not found"}

Adding middleware

All the magic lies in the middleware.

const { parse, tryCatch } = rxserver

const middleware = ({ http$ }) => ({
  http$: http$
    .do(logger)
    .catchMap(parse)
    .static(__dirname + '/public')
    .route(routes),
})

const { httpServerCallback } = createServerCallbacks(middleware)

The http$ is a RxJS Subject stream, i.e., an observable. It already has the operators map, switchMap and do attached.

The parse function asynchronously (hence the switchMap operator) converts { req, res } into { url, method, body, res }. It is wrapped in tryCatch

The switchCatch, route and static operators are unique to rxserver.

Operator: switchCatch

catchMap is the standard switchMap(predicate) changed to switchMap(tryCatch(predicate)). Where the tryCatch wraps your predicate function in a try/catch block, because Subject streams do not handle thrown errors well. I.e., .catchMap(parse) is equivalent to

switchMap(predicate => data => {
  try {
    return async predicate(data)
  } catch (e) {
    return ({ op: { error: e.message } })
  }
})

Operator: route

A route can be defined using simple functions, promises, async/await, or streams. E.g.,

const routes = [
  {
    url: '/name/:name',
    handler: ({ params }) => `Hello ${params.name}`,
  },
  {
    url: '/user',
    method: 'POST',
    handler: ({ body }) => Promise.resolve({ statusCode: 201, body }),
  },
  {
    url: '/search',
    handler: async function({ query }) {
      return await Promise.resolve({
        statusCode: 200,
        body: `async response: query = ${JSON.stringify(query)}`
      })
    },
  },
  {
    url: 'stream',
    handler: data => fs.createReadStream(__dirname + '/index.js'),  
  }
]

const middleware = ({ http$ }) => ({
  http$: http$
    .route(routes)
})

A route handler is supposed to be a simple function, e.g., see examples above. It can return a null, undefined, string, a promise, or an object of the shape

{
  statusCode: number || undefined,
  body: string || promise || object,
}

If you return a null or undefined, then req will continue to be checked against later routes. Whereas, if you respond with anything else, the request will not be checked against any further routes.

Examples can be found here

Operator: static [BETA]

Static servers the files from the directory passed to it:


const middleware = ({ http$ }) => ({
  http$: http$
    .route(routes)
})

TODO (pull requests welcome)

  • [ ] server side rendering
  • [ ] schema verification (optional)
  • [ ] authentication middleware
  • [ ] helmet security functionality
  • [ ] npm run example, etc *
  • [ ] tests: jest
  • [ ] circleci
  • [ ] websocket support
  • [ ] typescript && tsickle in example
  • [ ] business rules example
  • [ ] move to lerna, and split into multiple packages

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