funql-api

Build your next function based api today.

This library allow you to build a function based API. Interact with the server-side with functions and promises.

Features

• Load functions from FileSystem
• Transform responses in the server side
• Namespaces
• Client-side library
• Sockets support

Installation

npm i --save funql-api
yarn add funql-api

import funql from 'funql-api'

const funql = require('funql')

Server configuration

const app = express()
//Normal usage: call the middleware
funql.middleware(app, {
    /*defaults*/
    getMiddlewares:[],
    postMiddlewares:[],
    allowGet:false,
    allowOverwrite:false,
    attachToExpress:false,
    allowCORS: false,
    bodyParser:true, //required for POST
    api: {
        async helloWorld(name) {
            return `Hello ${name}`
        },
        backoffice:{
            getUsers(){
                return ['Juan','Paco']
            }
        }
    }
})

Load functions from folder

Basic usage

await funql.loadFunctionsFromFolder({
    path: require('path').join(process.cwd(),'functions')
})

Custom middlewares

These middlewares will act only on the functions loaded from this path. These are not express middlewares!

await funql.loadFunctionsFromFolder({
    namespace:'admin',
    path: require('path').join(process.cwd(),'functions')
    middlewares:[async function(){
//All the functions in namespace admin will invoke this middleware before running the function. If we return {err:'something'} The function will not be called and the client will receive a 200 status with the response. Useful for controlled exceptions.

return this.user.role!=='admin'?
({err:401}):true

    }]
})

Overwrite existing functions in the same path

If the function already exists, it will be overwritted.

await funql.loadFunctionsFromFolder({
    allowOverwrite:true,
    path: require('path').join(process.cwd(),'functions')
})

Load functions into namespace

await funql.loadFunctionsFromFolder({
    namespace:'backoffice',
    path: require('path').join(process.cwd(),'functions')
})

Express object binding

funql.middleware(app,{
    attachToExpress:true,
    api:{
        helloWorld(){
            return "Hello W"
        }
    }
})
console.log(app.api.helloWorld())
//Hello W

HTTP GET

Optionally, allow GET calls to interact with your functions.

funql.middleware(app,{
    allowGet:true
})

GET Middlewares

funql.middleware(app,{
    allowGet:true,
    getMiddlewares: [
        function(req, res, next) {
res.status(401).send('You are not allowed to request using GET!')
        }
    ]
})

CORS

Allow all

funql.middleware(app,{
    allowCORS:true
})

Customize allowed origins

funql.middleware(app,{
    allowCORS:['client1.domain.com','client2.domain.com']
})

Body parser

Disable body parser

In case you want to implement your own body parser.

app.use(require('body-parser').json())
funql.middleware(app,{
    bodyParser:false
})

Built-in body parser options

Give options to default express body parser.

funql.middleware(app,{
    bodyParser: {
        limit: '50mb'
    }
})

Client configuration

Basic Usage (Client)

axios.post(`SERVER_URL/funql-api`, {
    name: 'helloWorld',
    args:['Juan']
})
.then(res => {
    //Hello Juan
})
/*
server-side
function helloWorld(name){
    return `Hello ${name}`
}
*/

Feature: Namespaces

Namespaces help you to organize you a bit. You can use it for versioning!

axios.post(`SERVER_URL/funql-api`, {
    namespace:'api.v1.users',
    name: 'changePassword'
})

Feature: Transform the response in the server side

axios.post(`SERVER_URL/funql-api`, {
    namespace:'backoffice',
    name: 'helloWorld',
    args:['Juan']
    transform: function(response) {
        return response.toLowerCase()
    }.toString()
})
.then(res => {
    //juan
})

Feature: Use HTTP GET

let body = require('btoa')(JSON.stringify({
    name: 'foo'
}))
axios.get(`SERVER_URL/funql-api?body=${body}`, {
    name: 'helloWorld',
    args:['Juan']
})
.then(res => {
    //res.data equal to 'Hello Juan'
})
/*
server-side
function helloWorld(name){
    return `Hello ${name}`
}
*/

Feature: Client library

Use your functions directly. Let's abstracts the xhr operations

<script type="module">
    
import funql from 'https://cdn.jsdelivr.net/npm/[email protected]/client.js'
    
const fql = funql('http://localhost:3000')
fql('helloWorld','Juan').then(console.info)
//Hello Juan

</script>

Feature: Sockets speed

Turnon sockets globally. (socket.io)

//server    
funql.middleware({
    sockets:true
})
funql.listen(300, ()=>console.log('Listening at 3000'))

//client    
const fql = funql('http://localhost:3000',{
    connectionMode:'sockets'
})

Tests

• Requires Node >= 13.5
• Requires PORT 3000 available
• npm run test

Roadmap

• 2019 Q2: ADMIN Backoffice