for "pragmatic" developers...

wassim chegham

developer advocate

@manekinekko

faas: Function-as-a-service

Once upon the time, in the IT world...

Now, tell me...

Google Cloud Functions

Cloud Function For Firebase

Fully managed

Event oriented

Scalable

Sandboxed

Direct HTTP calls

Cloud Pub/Sub

Cloud Storage

Cloud Firestore
Real-time Database
Firebase Authentication
Google Analytics for Firebase

Open

Flexible

Standard

Node (JavaScript)

More runtimes to come...

Pay as you go

2M/month free calls (CPU/RAM)

100ms billing

125k/month free calls

getting started

developer experience

// index.js

// background triggers: Pub/Sub, Storage
exports.myLittlePony = (event, callback) => {
    callback(null, `Hello ${event.data.name || 'World'}!`);
}

// Http trigger
exports.myLittlePony = (request, response) => {
    response.send(`Hello ${req.body.name || 'World'}!`);
}
// package.json
{
    "main": "index.js"
    ...
}

Write your function

$ gcloud beta functions deploy myLittlePony
  --source <REPOSITORY_URL>
  --trigger-bucket <TRIGGER_BUCKET>



$ firebase deploy --only functions:myLittlePony
  --trigger-http
  --trigger-topic <TOPIC_NAME>

Deploy it (for production)

$ npm install @google-cloud/functions-emulator


$ functions deploy myLittlePony
  --trigger-bucket <TRIGGER_BUCKET>

Deploy it (on your machine)

  --trigger-http
  --trigger-topic <TOPIC_NAME>
$ npm install debug


functions deploy myLittlePony
  --trigger-bucket <TRIGGER_BUCKET>

Debug it (on your machine*)

// index.js

// background triggers: Pub/Sub, Storage
exports.myLittlePony = (event, callback) => {
    callback(null, `Hello ${event.data.name || 'World'}!`);
}

// Http trigger
exports.myLittlePony = (request, response) => {
    response.send(`Hello ${req.body.name || 'World'}!`);
}

* For remote debugging: https://cloud.google.com/debugger/

$ npm install jest # Mocha...

Test it (on your machine)

// foo.spec.js

describe("testing schedule", () => {
  it("should list all topics", () => {
    expect.assertions(1);
    return getListOfSlots().then(slots => {
      expect(slots.length).toBe(254);
    });
  });
});
$ npm install -g ngrok
$ ngrok http 8010


$ npm install -g localtunnel 
$ lt --port 8010

Access it (on your machine)

$ npm install -g artillery


$ artillery quick -d 300 -r 30 \
    https://us-central1-devoxx-be-2017.cloudfunctions.net/agent

Harness it (HTTP only)

real world use cases

gotchas

Logging strategy

DNS Optimisations

Runtime versions

Rollback strategies

JavaScript!?

demo time

1. Talk to the Bot (HTTP)

2. Upload the image (STORAGE)

3. Extract text (TOPIC)

4. Translate it (TOPIC)

5. Upload result (TOPIC)

6. Read the result (TOPIC)

7. Send SMS

that's all, folks!

FaaS: function-as-a-service: for "pragmatic" developers...

By Wassim Chegham

FaaS: function-as-a-service: for "pragmatic" developers...

FaaS: function-as-a-service: for "pragmatic" developers...

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