pubsub-http-handler
v6.0.0
Published
Handle Google PubSub requests with ease
Downloads
81
Readme
PubSub HTTP Handler
PubSub HTTP Handler is a simple Typescript/Javascript package that solves serving an HTTP endpoint that can consume PubSub messages. To do this task we utilize the Fastify framework or Google Cloud Functions.
This package was built so that when creating microservices that subscribe to a PubSub-topic, we don't have to implement a server or validate the request.
Quickstart
▶ yarn add pubsub-http-handler
Example with Fastify Server
import Fastify from 'fastify';
import { pubSubFastifyPlugin, PubSubHandler } from 'pubsub-http-handler';
interface MyHandler {
hello: string;
world: string;
}
const server = async () => {
const handler: PubSubHandler<MyHandler> = ({ message, data }) => {
// `message` contains attributes, data (as string), messageId
// `data` contains a base64 decoded JSON serialized object (type is MyHandler in the example)
// ...
};
const app = Fastify().withTypeProvider<TypeBoxTypeProvider>();
app.register(pubSubFastifyPlugin, makePubSubConfig({ handler }));
await app.listen(8000);
};
Example with Google Cloud Functions
import { pubSubCloudFunction, PubSubHandler } from 'pubsub-http-handler';
interface MyHandler {
hello: string;
world: string;
}
export const helloWorld = createPubSubCloudFunctions<MyHandler>(
({ data, log }) => {
log.info(`Hello, ${data.name}`);
},
);
Read more about configuration here or check out the API documentation
Options
onError
(function, default is undefined). Use to ensure that the function doesn't throw. Warning: Using this option will make the function return204
regardless.parseJson
(boolean, default istrue
). When set to true, usesJSON.parse
to parse the data sent through PubSub.parser
(function, optional). This option can be used to parse data coming from PubSub. The function must return data (this data is passed to the handler, asdata
). You can optionally throw an exception if the data could not be parsed, which in turn can be caught byonError
if you'd like.
We export a function called makePubSubConfig
to help with type inference. This
is basicly a function that lets you return a function while using parser
,
which is returned in handler
. If you know a way for the types to work without
using a function like this, we would love a pull request!
Contributing
We love contributions! 🙏 Bug reports and pull requests are welcome on GitHub.