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index.js
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index.js
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'use strict';
/**
* Lightweight web framework for your serverless applications
* @author Jeremy Daly <jeremy@jeremydaly.com>
* @version 0.6.0
* @license MIT
*/
const REQUEST = require('./lib/request.js') // Resquest object
const RESPONSE = require('./lib/response.js') // Response object
const UTILS = require('./lib/utils.js') // Require utils library
const prettyPrint = require('./lib/prettyPrint') // Pretty print for debugging
// Create the API class
class API {
// Create the constructor function.
constructor(props) {
// Set the version and base paths
this._version = props && props.version ? props.version : 'v1'
this._base = props && props.base && typeof props.base === 'string' ? props.base.trim() : ''
this._callbackName = props && props.callback ? props.callback.trim() : 'callback'
this._mimeTypes = props && props.mimeTypes && typeof props.mimeTypes === 'object' ? props.mimeTypes : {}
// Prefix stack w/ base
this._prefix = this.parseRoute(this._base)
// Stores timers for debugging
this._timers = {}
this._procTimes = {}
// Stores route mappings
this._routes = {}
// Default callback
this._cb = function(err,res) { console.log('No callback specified') }
// Middleware stack
this._middleware = []
// Error middleware stack
this._errors = []
// Store app packages and namespaces
this._app = {}
// Keep track of callback execution
this._done = false
// Keep track of triggered errors
this._error = false
// Executed after the callback
this._finally = () => {}
// Global error status
this._errorStatus = 500
// Testing flag (disables logging)
this._test = false
} // end constructor
// Convenience methods (path, handler)
get(p,h) { this.METHOD('GET',p,h) }
post(p,h) { this.METHOD('POST',p,h) }
put(p,h) { this.METHOD('PUT',p,h) }
patch(p,h) { this.METHOD('PATCH',p,h) }
delete(p,h) { this.METHOD('DELETE',p,h) }
options(p,h) { this.METHOD('OPTIONS',p,h) }
head(p,h) { this.METHOD('HEAD',p,h) }
// METHOD: Adds method and handler to routes
METHOD(method, path, handler) {
// Parse the path
let parsedPath = this.parseRoute(path)
// Split the route and clean it up
let route = this._prefix.concat(parsedPath)
// For root path support
if (route.length === 0) { route.push('')}
// Keep track of path variables
let pathVars = {}
// Loop through the paths
for (let i=0; i<route.length; i++) {
// If this is a variable
if (/^:(.*)$/.test(route[i])) {
// Assign it to the pathVars (trim off the : at the beginning)
pathVars[i] = route[i].substr(1)
// Set the route to __VAR__
route[i] = '__VAR__'
} // end if variable
// Add the route to the global _routes
this.setRoute(
this._routes,
(i === route.length-1 ? {
['__'+method.toUpperCase()]: {
vars: pathVars,
handler: handler,
route: '/'+parsedPath.join('/'),
path: '/'+this._prefix.concat(parsedPath).join('/') }
} : {}),
route.slice(0,i+1)
)
} // end for loop
} // end main METHOD function
// RUN: This runs the routes
async run(event,context,cb) {
// Set the event, context and callback
this._event = event
this._context = context
this._cb = cb
this._done = false
this._error = false
try {
// Initalize response and request objects
this.response = new RESPONSE(this)
this.request = new REQUEST(this)
// Loop through the middleware and await response
for (const mw of this._middleware) {
if (this._done || this._error) break
// Promisify middleware
await new Promise(r => { mw(this.request,this.response,() => { r() }) })
} // end for
// Execute the primary handler
if (!this._done && !this._error) await this.handler(this.request,this.response)
} catch(e) {
this.catchErrors(e)
}
} // end run function
// Catch all async/sync errors
async catchErrors(e) {
// Error messages should never be base64 encoded
this.response._isBase64 = false
// Strip the headers (TODO: find a better way to handle this)
this.response._headers = {}
let message;
if (e instanceof Error) {
this.response.status(this._errorStatus)
message = e.message
!this._test && console.log(e)
} else {
message = e
!this._test && console.log('API Error:',e)
}
// If first time through, process error middleware
if (!this._error) {
// Flag error state (this will avoid infinite error loops)
this._error = true
// Execute error middleware
for (const err of this._errors) {
if (this._done) break
// Promisify error middleware
await new Promise(r => { err(e,this.request,this.response,() => { r() }) })
} // end for
}
// Throw standard error unless callback has already been executed
if (!this._done) this.response.json({'error':message})
} // end catch
// Custom callback
async _callback(err, res) {
// Set done status
this._done = true
// Execute finally
await this._finally(this.request,this.response)
// Execute the primary callback
this._cb(err,res)
} // end _callback
// Middleware handler
use(fn) {
if (fn.length === 3) {
this._middleware.push(fn)
} else if (fn.length === 4) {
this._errors.push(fn)
} else {
throw new Error('Middleware must have 3 or 4 parameters')
}
} // end use
// Finally handler
finally(fn) {
this._finally = fn
}
//-------------------------------------------------------------------------//
// UTILITY FUNCTIONS
//-------------------------------------------------------------------------//
parseRoute(path) {
return path.trim().replace(/^\/(.*?)(\/)*$/,'$1').split('/').filter(x => x.trim() !== '')
}
// Recursive function to create routes object
setRoute(obj, value, path) {
if (typeof path === "string") {
let path = path.split('.')
}
if (path.length > 1){
let p = path.shift()
if (obj[p] === null) {
obj[p] = {}
}
this.setRoute(obj[p], value, path)
} else {
if (obj[path[0]] === null) {
obj[path[0]] = value
} else {
obj[path[0]] = Object.assign(value,obj[path[0]])
}
}
} // end setRoute
// Load app packages
app(packages) {
// Check for supplied packages
if (typeof packages === 'object') {
// Loop through and set package namespaces
for (let namespace in packages) {
try {
this._app[namespace] = packages[namespace]
} catch(e) {
console.error(e.message)
}
}
} else if (arguments.length === 2 && typeof packages === 'string') {
this._app[packages] = arguments[1]
}// end if
// Return a reference
return this._app
}
// Register routes with options
register(fn,options) {
// Extract Prefix
let prefix = options.prefix && options.prefix.toString().trim() !== '' ?
this.parseRoute(options.prefix) : []
// Concat to existing prefix
this._prefix = this._prefix.concat(prefix)
// Execute the routing function
fn(this,options)
// Remove the last prefix
this._prefix = this._prefix.slice(0,-(prefix.length))
} // end register
// prettyPrint debugger
routes(format) {
// Parse the routes
let routes = UTILS.extractRoutes(this._routes)
if (format) {
prettyPrint(routes)
} else {
return routes
}
}
} // end API class
// Export the API class as a new instance
module.exports = opts => new API(opts)