SlideShare a Scribd company logo
Elixir and Lambda talk
with a Telegram bot
Paolo Montrasio
MILAN 25-26 NOVEMBER 2016
Freelancer
paolo.montrasio@connettiva.eu
github.com/pmontrasio
Freelancer
Software architect
paolo.montrasio@connettiva.eu
github.com/pmontrasio
software design, APIs
team management
secure software development
Freelancer
Software architect
Backend developer
Rails Django Web2py Node
paolo.montrasio@connettiva.eu
github.com/pmontrasio
software design, APIs
team management
secure software development
Freelancer
Software architect
Backend developer
Milano Chatbots
Rails Django Web2py Node
meetup.com/Milano-Chatbots-Meetup
paolo.montrasio@connettiva.eu
github.com/pmontrasio
software design, APIs
team management
secure software development
Telegram
@PresenceAlertBot
It tells you how manyWiFi
mac address are in the air
Hello for the menu
/start to start
/stop to end
webhook
receiver
Users
webhook
Users
webhook
receiver
WiFi sensor
Users
Presences
webhook
receiver
WiFi sensor
Users
webhook
receiver
trigger
WiFi sensor
Presences
elixir
WiFi Sensor
elixir
Three layers
1. Functional
2. Object oriented
3. Process supervision
elixir
A look at the code
github.com
pmontrasio/wifi-sensor
elixir
elixir
The entry point
The processes
Dependencies, mix deps.get
Calling Erlang modules
Pattern matching
How to store state in a server
The |> operator
elixir
A more complex project
with object orientation and process supervision
github.com
pmontrasio/decibel
Slides at
connettiva.eu/elixir-phoenix-raspberry-wifi (Italian)
Also check “Elixir's object orientation” at
github.com/pmontrasio/elixir-oo
Receiver
github.com
pmontrasio/wifi-receiver
Elixir and Lambda talk with a Telegram bot - Paolo Montrasio - Codemotion Milan 2016
serverless.yml
serverless deploy
Install Dynamo DB locally
Where to init the client
How to test
Webhook andTrigger
github.com
pmontrasio/wifi-presence-bot
Elixir and Lambda talk with a Telegram bot - Paolo Montrasio - Codemotion Milan 2016
Register the webhook
Receive messages
Configure the trigger
Send messages
News
AWS Lambda environment variables and
serverless architecture
serverless 1.1
$ serverless invoke local -f FUNCTION
Alternatives
Google Cloud Functions, Azure functions
Apex, Gordon
paolo.montrasio@connettiva.eu

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Elixir and Lambda talk with a Telegram bot - Paolo Montrasio - Codemotion Milan 2016

Editor's Notes

  1. https://creativecommons.org/licenses/by-nc/3.0/
  2. https://creativecommons.org/licenses/by-nc/3.0/
  3. When you talked to the bot Telegram’s backend sent a HTTPS request to a webhook with JSON data. The webhook is a JavaScript function on AWS Lambda.
  4. It stores your user ID in a Dynamo DB table, Users.
  5. The Raspberry sends the count of unique WiFi mac addresses to another JavaScript function on AWS Lambda, once per minute.
  6. The count is timestamped and stored in another DynamoDB table, Presences.
  7. A trigger on Dynamo DB calls a third AWS Lambda function every time some data is added to Presences. That function gets all the Telegram user ids from Users and sends them a message with the count.
  8. The WiFi sensor on the Raspberry is implemented in Elixir.
  9. Elixir is a concurrent functional language running on the BEAM virtual machine, derived from Erlang with a Ruby like syntax. Elixir processes exchange data by sending messages to each other, much like OO method calls. A typical Elixir application has many processes because they are cheap to create, run and send messages to. Millions of processes are not unheard of, much like millions of objects in OO languages. But processes are concurrent and use all the cores of the machine. Finally there is a process supervision layer to restart processes if the fail, much like upstart of systemd.
  10. The entry point is mix.exs, which by default runs the run function in lib/sensor.ex Task.start_link creates a supervised process ChannelHopper.hop: tail call optimization MacAddressCounter: how to build a server spawn fn - > creates a process. Think: new Class :module.function is a call to an Erlang module
  11. Everybody knows AWS Lambda?
  12. Show the function at https://github.com/pmontrasio/wifi-receiver/blob/master/handler.js new AWS.DynamoDB.DocumentClient() outside the function, to save time (container reuse) Easy but we must automate the deployment and the creation of the https endpoint.
  13. $ serverless create --template aws-nodejs --name receiver serverless.yml defines how to create the environment on AWS Lambda and how to deploy the application. docs/Serverless_Setup.md is step by step guide at how to create and deploy the receiver. docs/DynamoDB.md to install Dynamo DB locally test/README.md on how to test. The important point is to be able to run the assertions in the callback run at the end of the function.
  14. The webhook must be registered on Telegram. presenceAlertWebhook gets the message in event.body.message presenceNotifier can be called once with many database Records, in the event.Records array. The trigger must be configured manually in the AWS console. See README.md for the details Messages are sent with a POST to Telegrams. Don’t use npm modules unless you really have to: every ms is important. Billed by 100 ms units.
  15. https://aws.amazon.com/blogs/aws/new-for-aws-lambda-environment-variables-and-serverless-application-model/ https://cloud.google.com/functions/ https://azure.microsoft.com/en-us/services/functions/ http://apex.run/ https://github.com/jorgebastida/gordon