jeroenhouben
Run function on startup
Simple question I could not find an answer for…
I want to perform a HTTP request once at startup of my app and log the output. Phoenix app in my case but the question is general really. I don’t need a whole genserver and all, just a function to run… somewhere
Where do I put this code?
Marked As Solved
hauleth
Add one of task in your supervisor children list. You can use Task.child_spec/1 for that. This is what I am using for such jobs like Slack notifications or systemd notifications.
Also Liked
entone
You can also use the :ignore return value in a GenServer init callback in your supervision tree, that will run your init callback and then kill/ignore the process after it’s run.
Last Post!
ityonemo
defmodule Foo do
def go do
GenServer.start_link(__MODULE__, :ok)
end
def init(_) do
:ignore
end
end
defmodule Bar do
def go do
GenServer.start_link(__MODULE__, :ok)
end
def init(_) do
{:stop, :reason}
end
end
defmodule Baz do
def go do
GenServer.start_link(__MODULE__, :ok)
end
def init(_) do
{:stop, :normal}
end
end
defmodule Quux do
def go do
Task.start_link(fn -> :do_something end)
end
end
try them all in the console to get a feel of what the supervisors see.
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