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phoenix_live_reload
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Provides live-reload functionality for Phoenix
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lib/phoenix_live_reload/web_console_logger.ex
defmodule Phoenix.LiveReloader.WebConsoleLogger do
@moduledoc false
use GenServer
@registry Phoenix.LiveReloader.WebConsoleLoggerRegistry
@compile {:no_warn_undefined, {Logger, :default_formatter, 0}}
def registry, do: @registry
def attach_logger do
if function_exported?(Logger, :default_formatter, 0) do
:ok =
:logger.add_handler(__MODULE__, __MODULE__, %{
formatter: Logger.default_formatter(colors: [enabled: false])
})
end
end
def detach_logger do
if function_exported?(Logger, :default_formatter, 0) do
:ok = :logger.remove_handler(__MODULE__)
end
end
def subscribe(prefix) do
{:ok, _} = Registry.register(@registry, :all, prefix)
:ok
end
def start_link(opts \\ []) do
GenServer.start_link(__MODULE__, opts, name: __MODULE__)
end
@impl GenServer
def init(opts) do
# We need to trap exits so that we receive the `terminate/2` callback during
# a graceful shutdown
Process.flag(:trap_exit, true)
attach_logger()
{:ok, opts}
end
@impl GenServer
def terminate(_reason, state) do
# On shutdown we need to detach the logger before the Registry stops
detach_logger()
{:ok, state}
end
# Erlang/OTP log handler
def log(%{meta: meta, level: level} = event, config) do
%{formatter: {formatter_mod, formatter_config}} = config
iodata = formatter_mod.format(event, formatter_config)
msg = IO.iodata_to_binary(iodata)
Registry.dispatch(@registry, :all, fn entries ->
event = %{level: level, msg: msg, file: meta[:file], line: meta[:line]}
for {pid, prefix} <- entries do
send(pid, {prefix, event})
end
end)
end
end