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author | Eric <[email protected]> | 2013-01-25 16:55:48 -0800 |
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committer | Eric <[email protected]> | 2013-01-25 16:55:48 -0800 |
commit | 14dc28856e0f9f16a406cdf2a16a603276efe273 (patch) | |
tree | 63bf9fe5f2b3c06cb693ba5fa46d1e09abf2181b /src/rcl_app_discovery.erl | |
parent | 4025eca47e6f80316e7f4c63efc93e7195f419e4 (diff) | |
download | relx-14dc28856e0f9f16a406cdf2a16a603276efe273.tar.gz relx-14dc28856e0f9f16a406cdf2a16a603276efe273.tar.bz2 relx-14dc28856e0f9f16a406cdf2a16a603276efe273.zip |
move app discovery to a dedicated module
Diffstat (limited to 'src/rcl_app_discovery.erl')
-rw-r--r-- | src/rcl_app_discovery.erl | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/rcl_app_discovery.erl b/src/rcl_app_discovery.erl new file mode 100644 index 0000000..20df1cf --- /dev/null +++ b/src/rcl_app_discovery.erl @@ -0,0 +1,223 @@ +%% -*- 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(ec_plists:map(fun(LibDir) -> + discover_dir([], LibDir) + end, LibDirs)), + AppMeta1 = setup_overrides(State, AppMeta0), + + Errors = [case El of + {error, Ret} -> Ret; + _ -> El + end + || El <- AppMeta1, + case El of + {error, _} -> + true; + _ -> + false + end], + + case Errors of + [] -> + AppMeta2 = lists:flatten(AppMeta1), + 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 <- AppMeta2]] + end), + {ok, AppMeta2}; + _ -> + ?RCL_ERROR(Errors) + end. + +app_name({error, _}) -> + undefined; +app_name(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 + [] -> + {error, {invalid_override, AppName, FileName}}; + Error = {error, _} -> + Error; + App -> + 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()], + file:name()) -> + [rcl_app_info:t() | {error, Reason::term()}] | + rcl_app_info:t() | {error, Reason::term()}. +discover_dir(IgnoreDirs, File) -> + case (not lists:member(File, IgnoreDirs)) + andalso filelib:is_dir(File) of + true -> + case file:list_dir(File) of + {error, Reason} -> + {error, {accessing, File, Reason}}; + {ok, List} -> + ec_plists:map(fun(LibDir) -> + discover_dir(IgnoreDirs, LibDir) + end, [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 -> + case get_deps(AppDir, AppName, AppVsn, AppDetail) of + {ok, App} -> + 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. |