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Productive. Reliable. Fast. A productive web framework that does not compromise speed or maintainability.
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lib/phoenix/endpoint/watcher.ex
defmodule Phoenix.Endpoint.Watcher do
@moduledoc false
require Logger
def child_spec(args) do
%{
id: make_ref(),
start: {__MODULE__, :start_link, [args]},
restart: :transient
}
end
def start_link({cmd, args}) do
Task.start_link(__MODULE__, :watch, [to_string(cmd), args])
end
def watch(_cmd, {mod, fun, args}) do
try do
apply(mod, fun, args)
catch
kind, reason ->
# The function returned a non-zero exit code.
# Sleep for a couple seconds before exiting to
# ensure this doesn't hit the supervisor's
# max_restarts/max_seconds limit.
Process.sleep(2000)
:erlang.raise(kind, reason, __STACKTRACE__)
end
end
def watch(cmd, args) when is_list(args) do
{args, opts} = Enum.split_while(args, &is_binary(&1))
opts = Keyword.merge([into: IO.stream(:stdio, :line), stderr_to_stdout: true], opts)
try do
System.cmd(cmd, args, opts)
catch
:error, :enoent ->
relative = Path.relative_to_cwd(cmd)
Logger.error(
"Could not start watcher #{inspect(relative)} from #{inspect(cd(opts))}, executable does not exist"
)
exit(:shutdown)
else
{_, 0} ->
:ok
{_, _} ->
# System.cmd returned a non-zero exit code
# sleep for a couple seconds before exiting to ensure this doesn't
# hit the supervisor's max_restarts / max_seconds limit
Process.sleep(2000)
exit(:watcher_command_error)
end
end
defp cd(opts), do: opts[:cd] || File.cwd!()
end