%% -*- 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 provider behaviour.
-module(rlx_app_discovery).
-export([do/2,
format_error/1]).
-include("relx.hrl").
%%============================================================================
%% API
%%============================================================================
%% @doc recursively dig down into the library directories specified in the state
%% looking for OTP Applications
-spec do(rlx_state:t(), [file:name()]) -> {ok, [rlx_app_info:t()]} | relx:error().
do(State, LibDirs) ->
ec_cmd_log:info(rlx_state:log(State),
fun() ->
["Resolving OTP Applications from directories:\n",
string:join([[rlx_util:indent(2), LibDir] || LibDir <- LibDirs], "\n")]
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
%%%===================================================================
-spec app_files(list(binary())) -> list(binary()).
app_files(LibDirs) ->
lists:foldl(fun(LibDir, Acc) ->
Files = app_files_paths(LibDir),
BinFiles = lists:map(fun(F) ->
list_to_binary(F)
end, Files),
Acc ++ BinFiles
end, [], LibDirs).
-spec app_files_paths(binary()) -> list(string()).
app_files_paths(LibDir) ->
%% Search for Erlang apps in the lib dir itself
Path1 = filename:join([binary_to_list(LibDir),
"*.app"]),
%% Search for Erlang apps in subdirs of lib dir
Path2 = filename:join([binary_to_list(LibDir),
"*",
"ebin",
"*.app"]),
lists:foldl(fun(Path, Acc) ->
Files = filelib:wildcard(Path),
Files ++ Acc
end, [], [Path1, Path2]).
-spec get_app_metadata(rlx_state:t(), list(binary())) -> list({ok, rlx_app_info:t()}).
get_app_metadata(State, LibDirs) ->
lists:foldl(fun(AppFile, Acc) ->
case is_valid_otp_app(AppFile) of
{ok, _} = AppMeta ->
[AppMeta|Acc];
{warning, W} ->
ec_cmd_log:debug(rlx_state:log(State), format_detail(W)),
Acc;
{error, E} ->
ec_cmd_log:error(rlx_state:log(State), format_detail(E)),
Acc;
_ ->
Acc
end
end, [], app_files(LibDirs)).
resolve_app_metadata(State, LibDirs) ->
AppMeta0 = case rlx_state:get(State, enable_shallow_app_discovery, false) of
true ->
get_app_metadata(State, LibDirs);
false ->
lists:flatten(rlx_dscv_util:do(fun discover_dir/2, LibDirs))
end,
case [case Err of
{error, Ret} ->
Ret
end
|| Err <- AppMeta0,
case Err of
{error, _} ->
true;
{warning, W} ->
ec_cmd_log:debug(rlx_state:log(State), format_detail(W)),
false;
_ ->
false
end] of
[] ->
SkipApps = rlx_state:skip_apps(State),
ExcludeApps = rlx_state:exclude_apps(State),
AppMeta1 = [rm_exclude_apps(App, ExcludeApps) ||
{ok, App} <- setup_overrides(State, AppMeta0),
not lists:keymember(rlx_app_info:name(App), 1, SkipApps++ExcludeApps)],
ec_cmd_log:debug(rlx_state:log(State),
fun() ->
["Resolved the following OTP Applications from the system: \n",
[[rlx_app_info:format(2, App), "\n"] || App <- AppMeta1]]
end),
{ok, AppMeta1};
Errors ->
?RLX_ERROR(Errors)
end.
%% Apps listed in {exclude_apps, [...]} must be removed from applications lists
rm_exclude_apps(App, ExcludeApps) ->
ActiveApps = lists:subtract(rlx_app_info:active_deps(App), ExcludeApps),
LibraryApps = lists:subtract(rlx_app_info:library_deps(App), ExcludeApps),
rlx_app_info:library_deps(rlx_app_info:active_deps(App, ActiveApps), LibraryApps).
app_name({warning, _}) ->
undefined;
app_name({error, _}) ->
undefined;
app_name({ok, AppMeta}) ->
rlx_app_info:name(AppMeta).
setup_overrides(State, AppMetas0) ->
Overrides = rlx_state:overrides(State),
AppMetas1 = [AppMeta || AppMeta <- AppMetas0,
not lists:keymember(app_name(AppMeta), 1, Overrides)],
[resolve_override(AppName, FileName) || {AppName, FileName} <- Overrides] ++ AppMetas1.
resolve_override(AppName, FileName0) ->
FileName1 = filename:absname(FileName0),
case is_valid_otp_app(filename:join([FileName1, <<"ebin">>,
erlang:atom_to_list(AppName) ++ ".app"])) of
{noresult, false} ->
{error, {invalid_override, AppName, FileName1}};
Error = {error, _} ->
Error;
{ok, App} ->
{ok, rlx_app_info:link(App, true)}
end.
-spec format_detail(ErrorDetail::term()) -> iolist().
format_detail({missing_beam_file, Module, BeamFile}) ->
io_lib:format("Missing beam file ~p ~s", [Module, BeamFile]);
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, rlx_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, rlx_app_info:t()} |
{warning, Reason::term()} |
{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 filename:extension(File) of
<<".app">> ->
gather_application_info(EbinDir, File);
_ ->
{noresult, false}
end;
_ ->
{noresult, false}
end.
-spec gather_application_info(file:name(), file:filename()) ->
{ok, rlx_app_info:t()} |
{warning, Reason::term()} |
{error, Reason::term()}.
gather_application_info(EbinDir, File) ->
AppDir = filename:dirname(EbinDir),
case file:consult(File) of
{ok, [{application, AppName, AppDetail}]} ->
validate_application_info(EbinDir, File, AppName, AppDetail);
{error, Reason} ->
{warning, {unable_to_load_app, AppDir, Reason}};
_ ->
{warning, {invalid_app_file, File}}
end.
-spec validate_application_info(file:name(),
file:name(),
atom(),
proplists:proplist()) ->
{ok, list()} |
{warning, Reason::term()} |
{error, Reason::term()}.
validate_application_info(EbinDir, AppFile, AppName, AppDetail) ->
AppDir = filename:dirname(EbinDir),
case get_modules_list(AppFile, AppDetail) of
{ok, List} ->
case has_all_beams(EbinDir, List) of
ok ->
get_vsn(AppDir, AppName, AppDetail);
Error1 ->
Error1
end;
Error -> Error
end.
-spec get_modules_list(file:name(), proplists:proplist()) ->
{ok, list()} |
{warning, Reason::term()} |
{error, Reason::term()}.
get_modules_list(AppFile, AppDetail) ->
case proplists:get_value(modules, AppDetail) of
undefined ->
{warning, {invalid_app_file, AppFile}};
ModulesList ->
{ok, ModulesList}
end.
-spec has_all_beams(file:name(), list()) ->
ok | {error, Reason::term()}.
has_all_beams(EbinDir, [Module | ModuleList]) ->
BeamFile = filename:join([EbinDir,
list_to_binary(atom_to_list(Module) ++ ".beam")]),
case ec_file:exists(BeamFile) of
true ->
has_all_beams(EbinDir, ModuleList);
false ->
{warning, {missing_beam_file, Module, BeamFile}}
end;
has_all_beams(_, []) ->
ok.
-spec get_vsn(file:name(), atom(), proplists:proplist()) ->
{ok, rlx_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(binary(), atom(), string(), proplists:proplist()) ->
{ok, rlx_app_info:t()} | {error, Reason::term()}.
get_deps(AppDir, AppName, AppVsn, AppDetail) ->
%% ensure that at least stdlib and kernel are defined as application deps
ActiveApps = ensure_stdlib_kernel(AppName,
proplists:get_value(applications, AppDetail, [])),
LibraryApps = proplists:get_value(included_applications, AppDetail, []),
rlx_app_info:new(AppName, AppVsn, AppDir, ActiveApps, LibraryApps).
-spec ensure_stdlib_kernel(AppName :: atom(),
Apps :: list(atom())) -> list(atom()).
ensure_stdlib_kernel(kernel, Deps) -> Deps;
ensure_stdlib_kernel(stdlib, Deps) -> Deps;
ensure_stdlib_kernel(_AppName, []) ->
%% minimum required deps are kernel and stdlib
[kernel, stdlib];
ensure_stdlib_kernel(_AppName, Deps) -> Deps.
%%%===================================================================
%%% Test Functions
%%%===================================================================
