%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*-
%%% 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_app_discovery).
-export([do/2,
format_error/1]).
-include_lib("relcool/include/relcool.hrl").
%%============================================================================
%% API
%%============================================================================
%% @doc recursively dig down into the library directories specified in the state
%% looking for OTP Applications
-spec do(rcl_state:t(), [filename:name()]) -> {ok, [rcl_app_info:t()]} | relcool:error().
do(State, LibDirs) ->
rcl_log:info(rcl_state:log(State),
fun() ->
["Resolving OTP Applications from directories:\n",
[[rcl_util:indent(1), LibDir, "\n"] || LibDir <- LibDirs]]
end),
resolve_app_metadata(State, LibDirs).
-spec format_error([ErrorDetail::term()]) -> iolist().
format_error(ErrorDetails)
when erlang:is_list(ErrorDetails) ->
[[format_detail(ErrorDetail), "\n"] || ErrorDetail <- ErrorDetails].
%%%===================================================================
%%% Internal Functions
%%%===================================================================
resolve_app_metadata(State, LibDirs) ->
AppMeta0 = lists:flatten(rcl_dscv_util:do(fun discover_dir/2, LibDirs)),
case [case Err of
{error, Ret} ->
Ret
end
|| Err <- AppMeta0,
case Err of
{error, _} ->
true;
_ ->
false
end] of
[] ->
AppMeta1 = [App || {ok, App} <- setup_overrides(State, AppMeta0)],
rcl_log:debug(rcl_state:log(State),
fun() ->
["Resolved the following OTP Applications from the system: \n",
[[rcl_app_info:format(1, App), "\n"] || App <- AppMeta1]]
end),
{ok, AppMeta1};
Errors ->
?RCL_ERROR(Errors)
end.
app_name({error, _}) ->
undefined;
app_name({ok, AppMeta}) ->
rcl_app_info:name(AppMeta).
setup_overrides(State, AppMetas0) ->
Overrides = rcl_state:overrides(State),
AppMetas1 = [AppMeta || AppMeta <- AppMetas0,
not lists:keymember(app_name(AppMeta), 1, Overrides)],
[case is_valid_otp_app(filename:join([FileName, "ebin",
erlang:atom_to_list(AppName) ++ ".app"])) of
{noresult, false} ->
{error, {invalid_override, AppName, FileName}};
Error = {error, _} ->
Error;
{ok, App} ->
{ok, rcl_app_info:link(App, true)}
end || {AppName, FileName} <- Overrides] ++ AppMetas1.
-spec format_detail(ErrorDetail::term()) -> iolist().
format_detail({error, {invalid_override, AppName, FileName}}) ->
io_lib:format("Override {~p, ~p} is not a valid OTP App. Perhaps you forgot to build it?",
[AppName, FileName]);
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({no_beam_files, EbinDir}) ->
io_lib:format("no beam files found in directory ~s", [EbinDir]);
format_detail({not_a_directory, EbinDir}) ->
io_lib:format("~s is not a directory when it should be a directory", [EbinDir]);
format_detail({unable_to_load_app, AppDir, _}) ->
io_lib:format("Unable to load the application metadata from ~s", [AppDir]);
format_detail({invalid_app_file, File}) ->
io_lib:format("Application metadata file exists but is malformed: ~s",
[File]);
format_detail({unversioned_app, AppDir, _AppName}) ->
io_lib:format("Application metadata exists but version is not available: ~s",
[AppDir]);
format_detail({app_info_error, {Module, Detail}}) ->
Module:format_error(Detail).
-spec discover_dir([file:name()], directory | file) ->
{ok, rcl_app_info:t()} | {error, Reason::term()}.
discover_dir(_File, directory) ->
{noresult, true};
discover_dir(File, file) ->
is_valid_otp_app(File).
-spec is_valid_otp_app(file:name()) -> {ok, rcl_app_info:t()} | {error, Reason::term()} |
{noresult, false}.
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 ->
{noresult, false}
end;
_ ->
{noresult, false}
end.
-spec has_at_least_one_beam(file:name(), file:filename()) ->
{ok, 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()) ->
{ok, 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()) ->
{ok, 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 ->
case get_deps(AppDir, AppName, AppVsn, AppDetail) of
{ok, App} ->
{ok, App};
{error, Detail} ->
{error, {app_info_error, Detail}}
end
end.
-spec get_deps(file:name(), atom(), string(), proplists:proplist()) ->
{ok, rcl_app_info:t()} | {error, Reason::term()}.
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.
