helloworld

Function Hello World

This function returns the "Hello World" message or "Hello " when you provide a name in the function call payload.

As you make your way through this tutorial, look out for this icon . Whenever you see it, it's time for you to perform an action.

Prerequisites

Before you deploy this sample function, make sure you have run steps A, B and C of the Oracle Functions Quick Start Guide for Cloud Shell

• A - Set up your tenancy
• B - Create application
• C - Set up your Cloud Shell dev environment

List Applications

Assuming you have successfully completed the prerequisites, you should see your application in the list of applications.

fn ls apps

Code, Deploy and Test a function

Python

Code

The Python folder contains the files to deploy the hello-python function in Python:

• the code of the function, func.py
• its dependencies, requirements.txt
• the function metadata, func.yaml

Deploy

Change directory to python and deploy the hello-python function using:

fn -v deploy --app <app-name>

e.g.

fn -v deploy --app myapp

Test

The command to invoke a function is

fn invoke <app-name> <func-name>

To invoke the Python hello-python function, run:

fn invoke myapp hello-python

The Python version displays {"message":"Hello World"}

To invoke the Python function with a payload, run:

echo -n '{"name":"Bob"}' | fn invoke myapp hello-python

The {"message":"Hello Bob"} output is displayed.

Congratulations! You've just created, deployed, and invoked a Python HelloWorld function using Oracle Functions!

Java

Code

The Java folder contains the files to deploy the hello-java function in Java:

• the code of the function, src/main/java/com/example/fn/HelloFunction.java
• its dependencies, pom.xml
• the function metadata, func.yaml

Deploy

Change directory to java and deploy the hello-java function using:

fn -v deploy --app <app-name>

e.g.

fn -v deploy --app myapp

Test

To invoke the Java hello-java function, run:

fn invoke myapp hello-java

The Java version displays Hello, world!

To invoke the Java function with a payload, run:

echo -n "Bob" | fn invoke myapp hello-java

The Hello, Bob! output is displayed.

Congratulations! You've just created, deployed, and invoked a Java HelloWorld function using Oracle Functions!

Appendix

In this example we used the provided files. However, you can also generate boilerplate HelloWorld function files by running the following command from your terminal:

fn init --runtime <runtime-language> <func-name>

where <runtime-language> is one of the supported runtime languages (currently java, python, node, go and ruby are supported).