Adds support for ES7 async functions to hapi route handlers
ES7 introduces async functions, which are functions that support the await keyword and return promises. This hapi plugin adds a handler called async that allows you to write your route handlers using async functions. You can also use hapi-async-handler with io.js, generator functions (and the yield keyword), and co today. There are examples of both styles of use shown below.
var server = new Hapi.Server();
server.register([
require('hapi-async-handler')
], function(error) { ... });Define an async function that receives request and reply like a normal route handler and assign it the async property of the route handler.
server.route({
method: 'GET',
path: '/',
handler: {
// The "async" handler accepts an async function
async: async function(request, reply) {
// instapromise gives you promises from methods with Node-style callbacks
require('instapromise');
var fileContents = await fs.promise.readFile('example.txt', 'utf8');
reply(fileContents);
}
}
});For the async keyword to work, you will need to transform your source code with Babel, regenerator, or a similar compiler.
You can also use co and generator functions without any source-code transformations if you are using io.js.
server.route({
method: 'GET',
path: '/',
handler: {
// co.wrap creates a function that returns a promise, just like an async function
async: co.wrap(function*(request, reply) {
require('instapromise');
var fileContents = yield fs.promise.readFile('example.txt', 'utf8');
reply(fileContents);
})
}
});