Service Worker Router

Nodejs Server side and Service Worker lazy router. Difference from client, client routers can take same route on multiple locations on page. Because this router we will use in Server side and service workers. We need to handle it outside from express or any other http app.

Router taking static routes like /a/b/c, also dynamic /a/:b/:c dynamic part will return data=>data.params in same order.

• Optional params /a(/:b) in this case will be triggered route /a and /a/b in second case b return as param.
• Splat params supported as well a/*b when trigger route /a/some/file.js will return as param some/file.js

Router willl trigger only first match routes.

Installation

    npm i functional-router

Examples

In general, router working with tasks and returning tasks.

Router subscribe to method get and return value.

import {router} from 'functional-router';
import {task} from 'functional_tasks';

        const routes = router();
        routes.get('/a', () => {
            return 'a route'
        });

        const res = await  routes.trigger({
        //next is uri you want to trigger on router/
            next:   '/a',
            method: 'GET'
        }).unsafeRun().then(/*success promise*/);
        
        //unsafeRun() you call, because you might want to do extra actions, see complex example below.

Router subscribe to method and taking params

import {router} from 'functional-router';
import {task} from 'functional_tasks';

        const routes = router();
        routes.get('/:a/:b', a => {
           //  a.params =['a','b'];
           
            return 'a route'
        });

        routes.trigger({
            next:   '/a/b',
            method: 'GET'
        }).unsafeRun().then(/*success promise*/);

Router subscribe, and taking nested routes.

    import {router} from 'functional-router';
    import {task} from 'functional_tasks';

    const route = router();

    const taskB = task(b =>  b.params.concat(b.a));


    route.get('/:a', task(a => {
         const {params, next, method} = a;
         return {params, next, method}
     }).flatMap(data => {
         // trigger some nested routes useful if want to render /table or /chart with same data
         const route = router({a: data.params});
         route.get('/:b', taskB);
         return route.trigger(data);
     }));

     route.trigger({
        next:   '/a/b',
        method: 'GET'
     });
     // doing some extra general conversion  
     .map(data=>data.join(','))
     .unsafeRun()
     .then(/*success promise*/);

Full Example for Nodejs http library

Defining routes similar like another router libraries. File called rest.js

import {task} from 'functional_tasks';
import {router} from 'functional-router';

const routes = router();

routes.get('/aaa', task(({req}) => ({response: 'a route', req})));
routes.get('/aab/:a', ({req}) => req);
routes.post('/aab', task(({req}) => req || 'no Body'));

export default routes

Adding routes in app.

    import http from 'http';
    import morgan from 'morgan';
    import bodyParser from 'body-parser'
    import {task} from 'functional_tasks';
    import {pipe, jsonHeader, response, notFound, match} from 'functional-router';
    
    import routes from './rest';
    
    const app = (req, resp) => task({req, resp})
        .through(pipe(morgan('combined')))
        .through(pipe(bodyParser.json()))
        .through(pipe(jsonHeader))
        .through(match(routes))
        .unsafeRun();
    
    http.createServer((req, resp) => {
        app(req, resp)
            .then(body => response(resp, body))
            .catch((error) => notFound(resp, error));
    
    }).listen(5050);

As you see, all plugins are compatible.

Also you can stream data.

    import {task, fileReadStream, writeStream} from 'functional_tasks';
    import {router, STREAM_END} from 'functional-router';
    
    const routes = router();
    
    const fileStream = (responseStream) => fileReadStream('./examples/streamRest/divine-comedy.txt')
        .through(writeStream(responseStream))
        .run()
        .then(() => STREAM_END);
    
    // fileStream();
    routes.get('/txt', task(({resp}) => fileStream(resp)));
    
    
    export default routes

There you hook in to stream, and returning, STREM_END flag, which notify router, stream is closed.

App will look same from above.

    import http from 'http';
    import morgan from 'morgan';
    import bodyParser from 'body-parser'
    import {task} from 'functional_tasks';
    import {pipe, htmlHeader, response, notFound, match} from 'functional-router';
    
    import routes from './stream';
    
    const app = (req, resp) => task({req, resp})
        .through(pipe(morgan('combined')))
        .through(pipe(bodyParser.json()))
        .through(pipe(htmlHeader))
        .through(match(routes))
        .unsafeRun();
    
    http.createServer((req, resp) => {
        app(req, resp)
            .then(body => response(resp, body))
            .catch((error) => notFound(resp, error));
    
    }).listen(5060);

match method support multiple routers, for example.

    import streamData from './stream';
    import rest from '../rest/rest'
    
    ...
        .through(match(streamData, rest))
    ...

See live example in examples folder.