%% -*- mode: Erlang; fill-column: 80; comment-column: 75; -*-
%%% Copyright 2012 Erlware, LLC. All Rights Reserved.
%%%
%%% This file is provided to you under the Apache License,
%%% Version 2.0 (the "License"); you may not use this file
%%% except in compliance with the License. You may obtain
%%% a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing,
%%% software distributed under the License is distributed on an
%%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%%% KIND, either express or implied. See the License for the
%%% specific language governing permissions and limitations
%%% under the License.
%%%---------------------------------------------------------------------------
%%% @author Eric Merritt <[email protected]>
%%% @copyright (C) 2012 Erlware, LLC.
%%%
%%% @doc This provider uses the lib_dir setting of the state. It searches the
%%% Lib Dirs looking for all OTP Applications that are available. When it finds
%%% those OTP Applications it loads the information about them and adds them to
%%% the state of available apps. This implements the rcl_provider behaviour.
-module(rcl_prv_discover).
-behaviour(rcl_provider).
-export([init/1,
do/1,
format/1]).
%%============================================================================
%% API
%%============================================================================
-spec init(rcl_state:t()) -> {ok, rcl_state:t()}.
init(State) ->
{ok, State}.
-spec do(rcl_state:t()) -> {error, Reason::term()} | {ok, rcl_state:t()}.
do(State) ->
LibDirs = rcl_state:lib_dirs(State),
AppMeta = lists:flatten(ec_plists:map(fun discover_dir/1, LibDirs)),
Errors = [case El of
{error, Ret} -> Ret;
_ -> El
end
|| El <- AppMeta,
case El of
{error, _} ->
true;
_ ->
false
end],
lists:filter(fun({error, _}) -> true;
(_) -> false
end, AppMeta),
case Errors of
[] ->
{ok, rcl_state:available_apps(State, lists:flatten(AppMeta))};
_ ->
{error, Errors}
end.
-spec format({error, [ErrorDetail::term()]}) -> iolist().
format({error, ErrorDetails}) ->
[[format_detail(ErrorDetail), "\n"] || ErrorDetail <- ErrorDetails].
%%%===================================================================
%%% Internal Functions
%%%===================================================================
-spec format_detail(ErrorDetail::term()) -> iolist().
format_detail({accessing, File, eaccess}) ->
io_lib:format("permission denied accessing file ~s", [File]);
format_detail({accessing, File, Type}) ->
io_lib:format("error (~p) accessing file ~s", [Type, File]);
format_detail({error, {no_beam_files, EbinDir}}) ->
io_lib:format("no beam files found in directory ~s", [EbinDir]);
format_detail({error, {not_a_directory, EbinDir}}) ->
io_lib:format("~s is not a directory when it should be a directory", [EbinDir]);
format_detail({error, {unable_to_load_app, AppDir, _}}) ->
io_lib:format("Unable to load the application metadata from ~s", [AppDir]);
format_detail({error, {invalid_app_file, File}}) ->
io_lib:format("Application metadata file exists but is malformed: ~s",
[File]);
format_detail({error, {unversioned_app, AppDir, _AppName}}) ->
io_lib:format("Application metadata exists but version is not available: ~s",
[AppDir]).
-spec discover_dir(file:name()) ->
[rcl_app_info:t() | {error, Reason::term()}] |
rcl_app_info:t() | {error, Reason::term()}.
discover_dir(File) ->
case filelib:is_dir(File) of
true ->
case file:list_dir(File) of
{error, Reason} ->
{error, {accessing, File, Reason}};
{ok, List} ->
ec_plists:map(fun discover_dir/1, [filename:join([File, Dir]) || Dir <- List])
end;
false ->
is_valid_otp_app(File)
end.
-spec is_valid_otp_app(file:name()) -> [rcl_app_info:t() | {error, Reason::term()} | []].
is_valid_otp_app(File) ->
%% Is this an ebin dir?
EbinDir = filename:dirname(File),
case filename:basename(EbinDir) of
"ebin" ->
case lists:suffix(".app", File) of
true ->
has_at_least_one_beam(EbinDir, File);
false ->
[]
end;
_ ->
[]
end.
-spec has_at_least_one_beam(file:name(), file:filename()) ->
rcl_app_info:t() | {error, Reason::term()}.
has_at_least_one_beam(EbinDir, File) ->
case file:list_dir(EbinDir) of
{ok, List} ->
case lists:any(fun(NFile) -> lists:suffix(".beam", NFile) end, List) of
true ->
gather_application_info(EbinDir, File);
false ->
{error, {no_beam_files, EbinDir}}
end;
_ ->
{error, {not_a_directory, EbinDir}}
end.
-spec gather_application_info(file:name(), file:filename()) ->
rcl_app_info:t() | {error, Reason::term()}.
gather_application_info(EbinDir, File) ->
AppDir = filename:dirname(EbinDir),
case file:consult(File) of
{ok, [{application, AppName, AppDetail}]} ->
get_vsn(AppDir, AppName, AppDetail);
{error, Reason} ->
{error, {unable_to_load_app, AppDir, Reason}};
_ ->
{error, {invalid_app_file, File}}
end.
-spec get_vsn(file:name(), atom(), proplists:proplist()) ->
rcl_app_info:t() | {error, Reason::term()}.
get_vsn(AppDir, AppName, AppDetail) ->
case proplists:get_value(vsn, AppDetail) of
undefined ->
{error, {unversioned_app, AppDir, AppName}};
AppVsn ->
get_deps(AppDir, AppName, AppVsn, AppDetail)
end.
-spec get_deps(file:name(), atom(), string(), proplists:proplist()) ->
rcl_app_info:t().
get_deps(AppDir, AppName, AppVsn, AppDetail) ->
ActiveApps = proplists:get_value(applications, AppDetail, []),
LibraryApps = proplists:get_value(included_applications, AppDetail, []),
rcl_app_info:new(AppName, AppVsn, AppDir, ActiveApps, LibraryApps).
%%%===================================================================
%%% Test Functions
%%%===================================================================
-ifndef(NOTEST).
-include_lib("eunit/include/eunit.hrl").
-endif.
