Elixir Club 10 March 17, 2018 Kyiv

1. Александр Хохлов
@nots_io
Phoenix and beyond:
Things we do with Elixir

2. Founder at Nots.io
http://nots.io

6. Why this talk?

7. In the beginning…

8. Phoenix:
Web Sockets, HAML, SASS

9. Guardian, Arc, ex_aws, Swoosh,
ueberauth/ueberauth_github

10. RethinkDB
rethinkdb_changefeed
postgrex

11. https://github.com/h4cc/
awesome-elixir

12. http://obolinx.com/resources/?p=1837

13. Erlang/Elixir port to Java process
with JInterface

14. https://www.safaribooksonline.com/library/view/erlang-programming/9780596803940/ch16s05.html

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

17. Postgrex.Notifications +
GenServer

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

29. point@nots.io
http://nots.io
http://blog.nots.io
@nots_io
facebook.com/nots.io