fn-serverless/examples/tutorial/hello/node/README.md

Tutorial 1: NodeJS Function w/ Input (3 minutes)

This example will show you how to test and deploy Node code to Oracle Functions. It will also demonstrate passing data in through stdin.

First, run the following commands:

# Initialize your function creating a func.yaml file
fn init <DOCKERHUB_USERNAME>/hello

# Test your function. 
# This will run inside a container exactly how it will on the server. It will also install and vendor dependencies from Gemfile
fn run

# Now try with an input
cat hello.payload.json | fn run

# Deploy your functions to the Oracle Functions server (default localhost:8080)
# This will create a route to your function as well
fn deploy myapp

Now call your function:

curl http://localhost:8080/r/myapp/hello

Or call from a browser: http://localhost:8080/r/myapp/hello

And now with the JSON input:

curl -H "Content-Type: application/json" -X POST -d @hello.payload.json http://localhost:8080/r/myapp/hello

That's it!

Note on Dependencies

Create a package.json file in your functions directory.

Run:

docker run --rm -v "$PWD":/function -w /function funcy/node:dev npm install

Then everything should work.

For example, using the package.json file in this directory which includes the request package, you can add this to func.js and it will work:

var request = require('request');
request('http://www.google.com', function (error, response, body) {
  if (!error && response.statusCode == 200) {
    console.log(body) // Show the HTML for the Google homepage.
  }
})

In Review

1. We piped JSON data into the function at the command line

   cat hello.payload.json | fn run
   

2. We received our function input through stdin

   obj = JSON.parse(fs.readFileSync('/dev/stdin').toString())
   

3. We wrote our output to stdout

   console.log
   

4. We sent stderr to the server logs

   console.error
   

Next Up

Tutorial 2: Input Parameters