[Serverless] Netlify serverless Demo
Netlify serverless
Set up a Local Development Environment for Serverless Functions Using Netlify
Netlify makes developing serverless functions easy with the netlify-cli (ntl for short). You'll be able to build and test functions locally as well as publish your functions from the CLI.
npm i -g netlify-cli
Testing:
ntl -v
We will install netlify-cli globally and create a netlify.toml file that will configure where the CLI should look to run functions that we define, in our case functions/. When the application is served up, Netlify runs functions under /.netlify/functions/.
netlify.toml:
[build]
publish = "public"
functions = "functions"
[dev]
autoLaunch = false
functions/hello-world.js
exports.handler = async () => {
return {
statusCode: 200,
body: "Hello world!",
};
};
RUN:
ntl dev
Visit
localhost:8888/.netlify/functions/hello-world
.
Deploy Serverless Functions to Production on Netlify using the Netlify CLI
ntl login ## login
ntl status ## verify
Netlify makes deploying to production a breeze by configuring your Netlify CLI to your Netlify account and integrating with GitHub.
We'll log in to Netlify through the CLI and initialize a site by completing all the options that the CLI runs us through. Once this is done, Netlify will trigger new builds for your site every time you push to GitHub.
ntl init ## select "Create new site"/"No Command/public folder"
ntl open ## open the site
or you can do the same thing on the netlify website.
Circumvent CORS when Accessing a Third-Party API using Netlify Functions
CORS limits websites from communicating with other domains without the full consent of both sites. Consuming data from a 3rd Party REST API makes it difficult since we can't properly configure the appropriate CORS headers. To solve this, we'll set up a proxy server to request the data using a Netlify function that avoids CORS altogether.
The Third-Party API that we'll be working with will provide the following data: id, name, favoriteSong for each corgi.
http://no-cors-api.netlify.app/api/corgis
We will also use node-fetch a light-weight module that brings the fetch API to fetch the data into our application.
functions/load-corgis.js
const fetch = require("node-fetch");
exports.handler = async () => {
const result = await fetch(
"http://no-cors-api.netlify.app/api/corgis"
).then((res) => res.json());
return {
statusCode: 200,
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(result),
};
};
public/index.html:
function loadCorgis() {
const conrgis = await fetch('/.netlify/functions/load-corgis') // load from local functions, to avoid CORS problem
.then(res => res.json());
render(
html` ${corgis.map((corgi) => html` <${Corgi} corgi=${corgi} /> `)}`,
document.querySelector('.corgis'),
);
}
Import and Set Environment Variables from a .env file using Netlify CLI
Create a .env
file. It is available for myself to use.
But if I want to share with the team. We need to share this .env
file.
netlify env:import .env
If successfully imported: you will see:
.----------------------------.
| Imported environment variables |
|----------------------------|
| Key | Value |
|------------|---------------|
| TEST_VALUE | an test world |
'----------------------------'
The .env
has been uploaded to netlify and saved there. Now even you delete the .env file, it will still be available.
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