erlangvm - wordpress.com · enjoy using elixir effectively to help your company tobias pfeiffer...
TRANSCRIPT
![Page 1: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/1.jpg)
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functional
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functional
ErlangVM
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functional
ErlangVM
Parallelism
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Who wants to go and build a system in Elixir?
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You shouldn’t
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Elixir, Your Monolith and You
Tobias Pfeiffer@PragTob
pragtob.info
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Your Monolith and You
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Your Monolith now?
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Your Monolith?
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Tear it all down and rewrite it
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Sooooon!
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“We rewrote it all in Language x, now it’s 10 times faster and only
50% of the code!”Someone
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“Language x, is 10 times faster and requires 50% of the code of language Y!”
Someone
Often implies...
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What nobody tells you...
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Business Value?
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Sooooon!
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Replace it step by step
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We have a bedroom,for the bathroom please
check out legacy!
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Terraform allows you to incrementally transform an
older API into one powered by Phoenix - one endpoint at a
time.
poteto/terraform
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Terraform allows you to incrementally transform an
older API into one powered by Phoenix - one endpoint at a
time.
poteto/terraformNot the Infrastructure
As Code
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defmodule MyApp.Terraformers.Foo do alias MyApp.Clients.Foo use Plug.Router
plug :match plug :dispatch
get "/v1/hello-world", do: send_resp(conn, 200, "Hi")
get _ do res = Foo.get!(conn) send_response({:ok, conn, res}) endend
poteto/terraform
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Replace a critical component
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Damn our heater alwaysbreaks down when it’s cold!
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Check out our sweet newheating system!
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Write a new component
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Check it out we built abrand new high tech
entertainment facility!
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Write a new component
Obvious in microservices
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“Is the technology I’m choosing the right fit for the problem I’m trying to
solve?”Everyone, hopefully
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Reasonably separate and limited problem
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Requirement that poses a problem for the current
stack
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Spark of Enthusiasm
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Courier Tracking
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Courier Tracking
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Courier Tracking
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Courier Tracking
Websockets
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Courier Tracking
Websockets
Basic Knowledge
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How to make them talk?
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Monolith
FrontendCourier
DB
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MonolithTracking
FrontendCourier
DB DB
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Connect them?
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MonolithTracking
FrontendCourier
DB DB
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JSONWebToken
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HeaderPayloadSignature
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{ "role": "admin", "courier_ids": [1337, 55], "id": 42, "exp": 1520469475}
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MonolithTracking
FrontendCourier
DB DBShared Secret
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MonolithTracking
FrontendCourier
DB DB
JWT
JWT
Shared Secret
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MonolithTracking
FrontendCourier
DB DB
JWT JWT
JWT
Shared Secret
JWT
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def connect(%{"token" => token}, socket) do token |> JWT.verify_token |> respond_based_on_token_contents(socket)end
Socket
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def connect(%{"token" => token}, socket) do token |> JWT.verify_token |> respond_based_on_token_contents(socket)end
Pattern Match
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def connect(%{"token" => token}, socket) do token |> JWT.verify_token |> respond_based_on_token_contents(socket)end
Pipe
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defp login_user(%{"role" => role, ...}, socket) do {:ok, assign(socket, :user, %{role: role, ...})}end
Socket
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def join("courier:" <> courier_id, _, %{assigns: %{user: user}}) do if authorized?(courier_id, user) do # login else # unauthorizd endend
Channel
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defp authorized?("", _), do: falsedefp authorized?(courier_id, %{courier_ids: ids}) do Enum.member?(ids, String.to_integer(courier_id))enddefp authorized?(_, _), do: false
Channel
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defp authorized?("", _), do: falsedefp authorized?(courier_id, %{courier_ids: ids}) do Enum.member?(ids, String.to_integer(courier_id))enddefp authorized?(_, _), do: false
Channel
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defp authorized?("", _), do: falsedefp authorized?(courier_id, %{courier_ids: ids}) do Enum.member?(ids, String.to_integer(courier_id))enddefp authorized?(_, _), do: false
Channel
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defp authorized?("", _), do: falsedefp authorized?(courier_id, %{courier_ids: ids}) do Enum.member?(ids, String.to_integer(courier_id))enddefp authorized?(_, _), do: false
Channel
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defp authorized?("", _), do: falsedefp authorized?(courier_id, %{courier_ids: ids}) do Enum.member?(ids, String.to_integer(courier_id))enddefp authorized?(_, _), do: false
Channel
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MonolithTracking
FrontendCourier
DB DB
LocationsLocations
Most of the time
![Page 66: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/66.jpg)
MonolithTracking
FrontendCourier
DB DB
LocationsLocations
Websocket
![Page 67: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/67.jpg)
MonolithTracking
FrontendCourier
DB DB
LocationsLocations
HTTP REST
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Fulfillment
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Fulfillment
CRUD
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Fulfillment
CRUD
Experience
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MonolithFulfillment
DB DB
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MonolithFulfillment
DB DB
Own UI
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MonolithFulfillment
DB DB
OAuth
OAuth
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MonolithFulfillment
DB DB
/current_user
Who?
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MonolithFulfillment
DB DB
Products
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MonolithFulfillment
DB DB
Order
Valid?Order
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MonolithFulfillment
DB DB
Packaging
Create
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MonolithFulfillment
DB DB
HTTP REST
Create
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Railway Oriented Programming
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defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
![Page 81: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/81.jpg)
defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
“Success” Rail
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defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
“Error” Rail
![Page 83: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/83.jpg)
defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
Validate internally
![Page 84: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/84.jpg)
defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
Validate externally
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defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
Save
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defmodule Fulfillment.OrderCreation do def create(params, customer, auth) do with {:ok, order} <- validate_order(params, customer), {:ok, order} <- validate_in_backend(order, auth), {:ok, order} <- Repo.insert(order) do {:ok, order} else {:error, changeset} -> {:error, changeset} end endend
Done
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No Kafka/Message Queue/
GraphQL?
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Be careful with new technologies!
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Microservices!
![Page 90: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/90.jpg)
Microservices!”Macroapplications”
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All challenges areclearly technical
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All challenges areclearly technical
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Stakeholders
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Your team
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First Major Version
![Page 96: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/96.jpg)
Get the others on board
![Page 97: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/97.jpg)
Workshops
![Page 98: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/98.jpg)
To know it,you got to build it
![Page 99: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/99.jpg)
![Page 100: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/100.jpg)
Pair Adopter with Alchemist
![Page 101: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/101.jpg)
Pair Adopter with Alchemist
Alchemist doesn’t touch keyboard
![Page 102: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/102.jpg)
Knowledge
![Page 103: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/103.jpg)
Knowledge
![Page 104: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/104.jpg)
“We are still using this like Rails – we should
use GenServers!”Someone on your team
![Page 105: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/105.jpg)
You don’t need to kill your Monolith,Complement it
![Page 106: ErlangVM - WordPress.com · Enjoy Using Elixir effectively to Help Your Company Tobias Pfeiffer @PragTob pragtob.info. Author: Tobias Pfeiffer Created Date: 5/26/2018 11:22:22 AM](https://reader033.vdocuments.us/reader033/viewer/2022050523/5fa67f05953b287e670975e4/html5/thumbnails/106.jpg)
Your Apps
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Enjoy Using Elixir effectively to Help Your Company
Tobias Pfeiffer@PragTob
pragtob.info