test

index.js

"use strict";
const R = require('ramda');
const app = require('express')();

const Maybe = require('monet').Maybe;
const Left = require('monet').Left;
const Right = require('monet').Right;



const COMMANDS = new Set(['verify','pay','check']);

const AppErrors = new Map();
AppErrors.set('no_query', 'empty query string')
AppErrors.set('invalid_cmd', 'invalid or empty cmd')

const request_validator = (query) => {
    //query may be {}
    return Maybe
            .fromNull(query)
            .toEither(AppErrors.get('no_query'))
}

const cmd_validator = (data) => {
    const query = data.req.query;
   
    return request_validator(query)
            .flatMap(query => COMMANDS.has(query.cmd) ? Right(query.cmd) : Left(AppErrors.get('invalid_cmd')))
} 


app.get('/request', (req, res) => {
    cmd_validator({req:req, res:res})
            .cata( err =>  {
                res.status(500).send({ error: 'something blew up' }) 
            },
                valid_cmd =>  {
                    res.send('can produce task');
                    console.log('can produce task')
            }  
    );
});

const server = app.listen(4422, () => {
    console.info('listen on 4422');
})

module.exports = server;