defmodule Phoenix.CodeReloader do
@moduledoc """
A plug and module to handle automatic code reloading.
To avoid race conditions, all code reloads are funneled through a
sequential call operation.
"""
## Server delegation
@doc """
Reloads code for the current Mix project by invoking the
`:reloadable_compilers` on the list of `:reloadable_apps`.
This is configured in your application environment like:
config :your_app, YourAppWeb.Endpoint,
reloadable_compilers: [:gettext, :elixir],
reloadable_apps: [:ui, :backend]
Keep in mind `:reloadable_compilers` must be a subset of the
`:compilers` specified in `project/0` in your `mix.exs`.
The `:reloadable_apps` defaults to `nil`. In such case
default behaviour is to reload the current project if it
consists of a single app, or all applications within an umbrella
project. You can set `:reloadable_apps` to a subset of default
applications to reload only some of them, an empty list - to
effectively disable the code reloader, or include external
applications from library dependencies.
This function is a no-op and returns `:ok` if Mix is not available.
## Options
* `:reloadable_args` - additional CLI args to pass to the compiler tasks.
Defaults to `["--no-all-warnings"]` so only warnings related to the
files being compiled are printed
"""
@spec reload(module, keyword) :: :ok | {:error, binary()}
def reload(endpoint, opts \\ []) do
if Code.ensure_loaded?(Mix.Project), do: reload!(endpoint, opts), else: :ok
end
@doc """
Same as `reload/1` but it will raise if Mix is not available.
"""
@spec reload!(module, keyword) :: :ok | {:error, binary()}
defdelegate reload!(endpoint, opts), to: Phoenix.CodeReloader.Server
@doc """
Synchronizes with the code server if it is alive.
It returns `:ok`. If it is not running, it also returns `:ok`.
"""
@spec sync :: :ok
defdelegate sync, to: Phoenix.CodeReloader.Server
## Plug
@behaviour Plug
import Plug.Conn
@style %{
primary: "#EB532D",
accent: "#a0b0c0",
text_color: "#304050",
logo:
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monospace_font: "menlo, consolas, monospace"
}
@doc """
API used by Plug to start the code reloader.
"""
def init(opts) do
Keyword.put_new(opts, :reloader, &Phoenix.CodeReloader.reload/2)
end
@doc """
API used by Plug to invoke the code reloader on every request.
"""
def call(conn, opts) do
case opts[:reloader].(conn.private.phoenix_endpoint, opts) do
:ok ->
conn
{:error, output} ->
conn
|> put_resp_content_type("text/html")
|> send_resp(500, template(output))
|> halt()
end
end
defp template(output) do
"""
CompileError
Compilation error
Console output is shown below.
"""
end
defp format_output(output) do
output
|> String.trim()
|> Plug.HTML.html_escape()
end
end