hapi-async-handler
v1.0.3
Published
Adds support for ES7 async functions to hapi route handlers
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hapi-async-handler
Adds support for ES7 async functions to hapi route handlers
ES7 Async Functions
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.
Using hapi-async-handler
Registering the Plugin
var server = new Hapi.Server();
server.register([
require('hapi-async-handler')
], function(error) { ... });
Defining a Route Handler
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.
Using co
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);
})
}
});