Phoenix and beyond: Things we do with Elixir - Alexander Khokhlov
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This document summarizes various things that can be done with the Elixir programming language. It discusses building web applications with Phoenix, integrating with services like RethinkDB and Postgres using libraries like ex_aws and Postgrex, communicating with Java processes using ports, building HTTP and socket APIs, and running concurrent tasks. Examples are provided for web sockets, database changefeeds, notifications, HTTP requests/responses, TCP sockets, and async task streams in Elixir.
![def init(_params) do
cd = “#{:code.priv_dir(:your_app)}"
cmd = "java -jar package.jar"
port = Port.open({:spawn,cmd}, [:binary, :use_stdio,
packet: 4, cd: cd])
true = Port.connect(port, self())
{:ok,port}
end
Port.command(port, :erlang.term_to_binary(data))
def handle_info({port,{:data,b}}, port) do
data = :erlang.binary_to_term(b)
end](https://image.slidesharecdn.com/pointelixir10presentation-180323134456/85/Phoenix-and-beyond-Things-we-do-with-Elixir-Alexander-Khokhlov-16-320.jpg)
![# receive tcp packet as message
{:ok, socket} = :gen_tcp.connect('localhost', port,
[:binary, active: true])
def handle_info({:tcp, _socket, msg}, state) do ...
end
# receive tcp packet with recv
:inet.setopts(socket, active: false)
:ok = :gen_tcp.send(socket, data)
{:ok, <<_msg_len :: binary - size(16),
msg :: binary>>} = :gen_tcp.recv(socket, 0, 2000)](https://image.slidesharecdn.com/pointelixir10presentation-180323134456/85/Phoenix-and-beyond-Things-we-do-with-Elixir-Alexander-Khokhlov-25-320.jpg)
![results = notes
|> Task.async_stream(__MODULE__, :update,
[some, params], max_concurrency: 20)
|> Enum.to_list
|> Keyword.get(:ok)
def update(note, some, params) do ... end](https://image.slidesharecdn.com/pointelixir10presentation-180323134456/85/Phoenix-and-beyond-Things-we-do-with-Elixir-Alexander-Khokhlov-27-320.jpg)
Phoenix and beyond: Things we do with Elixir - Alexander Khokhlov
- 1. Александр Хохлов @nots_io Phoenix and beyond: Things we do with Elixir
- 8. Phoenix: Web Sockets, HAML, SASS
- 9. Guardian, Arc, ex_aws, Swoosh, ueberauth/ueberauth_github
- 13. Erlang/Elixir port to Java process with JInterface
- 16. def init(_params) do cd = “#{:code.priv_dir(:your_app)}" cmd = "java -jar package.jar" port = Port.open({:spawn,cmd}, [:binary, :use_stdio, packet: 4, cd: cd]) true = Port.connect(port, self()) {:ok,port} end Port.command(port, :erlang.term_to_binary(data)) def handle_info({port,{:data,b}}, port) do data = :erlang.binary_to_term(b) end
- 19. PLPGSQL: PERFORM pg_notify(‘invitations_changes’, payload) Elixir: {:ok, pid} = Postgrex.Notifications.start_link(config) Postgrex.Notifications.listen(pid, "invitations_changes") def handle_info({:notification, _pid, _ref, "invitations_changes", payload}, state) do … end
- 21. API: HTTP API with Poison & HTTPoison
- 22. HTTPoison.put(url, Poison.encode!(data)) HTTPoison.get(url) HTTPoison.post(url, Poison.encode!(data))) case resp do {:ok, %HTTPoison.Response{status_code: 200, body: body}}-> {:ok, body |> Poison.decode!} {:ok, %HTTPoison.Response{status_code: 404}} -> {:error, :not_found} {:ok, %HTTPoison.Response{body: body}} -> {:error, body |> Poison.decode!} {:error, %HTTPoison.Error{reason: reason}} -> {:error, reason} end
- 23. API: Socket API with gen_tcp
- 25. # receive tcp packet as message {:ok, socket} = :gen_tcp.connect('localhost', port, [:binary, active: true]) def handle_info({:tcp, _socket, msg}, state) do ... end # receive tcp packet with recv :inet.setopts(socket, active: false) :ok = :gen_tcp.send(socket, data) {:ok, <<_msg_len :: binary - size(16), msg :: binary>>} = :gen_tcp.recv(socket, 0, 2000)
- 26. Concurrent tasks
- 27. results = notes |> Task.async_stream(__MODULE__, :update, [some, params], max_concurrency: 20) |> Enum.to_list |> Keyword.get(:ok) def update(note, some, params) do ... end