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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (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.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
%% under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2009 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2009 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2009 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_plugin_activator).
-export([start/0, stop/0]).
-define(DefaultPluginDir, "plugins").
-define(DefaultUnpackedPluginDir, "priv/plugins").
-define(DefaultRabbitEBin, "ebin").
-define(BaseApps, [rabbit]).
-ifdef(enable_debug).
-define(Debug(F, V), io:format("DEBUG: " ++ F, V)).
-endif.
-ifndef(enable_debug).
-define(Debug(_F, _V), ok).
-endif.
-define(Error(F, V), io:format("ERROR: " ++ F, V)).
%%----------------------------------------------------------------------------
start() ->
% Ensure Rabbit is loaded so we can access it's environment
application:load(rabbit),
% Determine our various directories
PluginDir = get_env_or_default(plugins_dir, ?DefaultPluginDir),
UnpackedPluginDir = get_env_or_default(plugins_expand_dir, ?DefaultUnpackedPluginDir),
RabbitEBin = get_env_or_default(rabbit_ebin, ?DefaultRabbitEBin),
?Debug("Got Plugin Dir ~p~n", [PluginDir]),
?Debug("Got Unpacked Plugin Dir ~p~n", [UnpackedPluginDir]),
?Debug("Got Rabbit EBin Dir ~p~n", [RabbitEBin]),
% Unpack any .ez plugins
unpack_ez_plugins(PluginDir, UnpackedPluginDir),
% Build a list of required apps based on the fixed set, and any plugins
RequiredApps = ?BaseApps ++ find_plugins(PluginDir) ++ find_plugins(UnpackedPluginDir),
% Build the entire set of dependencies - this will load the applications along the way
AllApps = case catch sets:to_list(expand_dependencies(RequiredApps)) of
{unknown_app, _} ->
?Error("Failed to expand dependencies.~n", []),
halt(1);
AppList ->
AppList
end,
AppVersions = [determine_version(App) || App <- AllApps],
{value, {rabbit, RabbitVersion}} = lists:keysearch(rabbit, 1, AppVersions),
% Build the overall release descriptor
RDesc = {release,
{"rabbit", RabbitVersion},
{erts, erlang:system_info(version)},
AppVersions},
% Write it out to ebin/rabbit.rel
?Debug("Generated rabbit.rel: ~p.~n", [RDesc]),
file:write_file(RabbitEBin ++ "/rabbit.rel", io_lib:format("~p.~n", [RDesc])),
% Compile the script
case systools:make_script(RabbitEBin ++ "/rabbit", [local, silent]) of
{ok, Module, Warnings} ->
% This gets lots of spurious no-source warnings when we have .ez files, so we want to supress them to prevent
% hiding real issues.
WarningStr = Module:format_warning([W || W <- Warnings,
case W of
{warning, {source_not_found, _}} -> false;
_ -> true
end]),
case length(WarningStr) of
0 -> ok;
_ -> io:format("~s", [WarningStr])
end,
ok;
{error, Module, Error} ->
io:format("Boot file generation failed: ~s~n", [Module:format_error(Error)]),
halt(1)
end,
halt(),
ok.
stop() ->
ok.
get_env_or_default(Key, Default) ->
case application:get_env(rabbit, Key) of
{ok, V} -> V;
_ -> Default
end.
determine_version(App) ->
application:load(App),
{ok, Vsn} = application:get_key(App, vsn),
{App, Vsn}.
assert_dir(Dir) ->
case filelib:is_dir(Dir) of
true -> ok;
false ->
ok = filelib:ensure_dir(Dir),
ok = file:make_dir(Dir)
end.
delete_dir(Dir) ->
case filelib:is_dir(Dir) of
true ->
case file:list_dir(Dir) of
{ok, Files} ->
Paths = [Dir ++ "/" ++ F || F <- Files],
[delete_dir(F) || F <- Paths, filelib:is_dir(F)],
[file:delete(F) || F <- Paths, filelib:is_file(F)]
end,
ok = file:del_dir(Dir);
false ->
ok
end.
unpack_ez_plugins(PluginSrcDir, PluginDestDir) ->
% Eliminate the contents of the destination directory
delete_dir(PluginDestDir),
assert_dir(PluginDestDir),
[unpack_ez_plugin(PluginName, PluginDestDir) || PluginName <- filelib:wildcard(PluginSrcDir ++ "/*.ez")].
unpack_ez_plugin(PluginFn, PluginDestDir) ->
zip:unzip(PluginFn, [{cwd, PluginDestDir}]),
ok.
find_plugins(PluginDir) ->
[prepare_dir_plugin(PluginName) || PluginName <- filelib:wildcard(PluginDir ++ "/*/ebin/*.app")].
prepare_dir_plugin(PluginAppDescFn) ->
% Add the plugin ebin directory to the load path
PluginEBinDirN = filename:dirname(PluginAppDescFn),
code:add_path(PluginEBinDirN),
% We want the second-last token
NameTokens = string:tokens(PluginAppDescFn,"/."),
PluginNameString = lists:nth(length(NameTokens) - 1, NameTokens),
list_to_atom(PluginNameString).
expand_dependencies(Pending) ->
expand_dependencies(sets:new(), Pending).
expand_dependencies(Current, []) ->
Current;
expand_dependencies(Current, [Next|Rest]) ->
case sets:is_element(Next, Current) of
true ->
expand_dependencies(Current, Rest);
false ->
case application:load(Next) of
ok ->
ok;
{error, {already_loaded, _}} ->
ok;
X ->
?Error("Failed to load ~s: ~p~n", [Next, X]),
throw({unknown_app, Next})
end,
{ok, Required} = application:get_key(Next, applications),
Unique = [A || A <- Required, not(sets:is_element(A, Current))],
expand_dependencies(sets:add_element(Next, Current), Rest ++ Unique)
end.
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