SourceGoogle Functions Emulator
Wanting to learn Google Cloud Functions and not waste time uploading and publishing I tried the Google Cloud Functions Emulator within my Windows environment. Here is my write up of how I deployed my first HTTP Function locally.
Pre-Requisites
You need Node.js 6.9.1, otherwise you will get the following error
Node.js v6.9.1 is required to run the emulator!
Anything later and it will not work.
Install ‘functions’
Open a command prompt and start the emulator installation
npm install -g @google-cloud/functions-emulator
Authenticate
Note: only if you need to access Google Services do you need to do this. You need to have a valid Google Tokens configured locally, and they will be the same as he one used when deployed.
HTTP Hello World
Lets start by creating a simple HTTP example HelloWorld by creating a functions directory and adding and index.js
file containing the folowing.
First lets start the emualtor
functions start
Should return similair to
Starting Google Cloud Functions Emulator...
Google Cloud Functions Emulator STARTED
┌───────────────┬────────────┬────────────────────────────────────────────────────┐
│ Name │ Type │ Path │
├───────────────┴────────────┴────────────────────────────────────────────────────┤
│ No functions deployed _\_(?)_/_. Run "functions deploy" to deploy a function │
└─────────────────────────────────────────────────────────────────────────────────┘
Next deploy to the emulator using the following command
functions deploy helloWorldHttp ./ --trigger-http
Should return similair to
Function helloWorldHttp deployed.
┌──────────┬──────────────────────────────────────────────────────────────────────┐
│ Property │ Value │
├──────────┼──────────────────────────────────────────────────────────────────────┤
│ Name │ helloWorldHttp │
├──────────┼──────────────────────────────────────────────────────────────────────┤
│ Type │ HTTP │
├──────────┼──────────────────────────────────────────────────────────────────────┤
│ Path │ C:\development\gcloud\functions │
├──────────┼──────────────────────────────────────────────────────────────────────┤
│ Url │ http://localhost:8008/helloWorldHttp │
└──────────┴──────────────────────────────────────────────────────────────────────┘
Now request the function with the following
curl -X POST http://localhost:8008/helloWorldHttp -H "Content-Type: application/json" -d "{\"name\": \"Test\"}"
The output should be
Hello Test!
Conclusion
That was a simple walkthrough of getting the Google Cloud Functions Emulator running a simple HTTP Function. You can use it for other Functions testing as well and for further details checkout cloud-functions-emulator
