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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 Developer of the Original Code is VMware, Inc.
%% Copyright (c) 2007-2011 VMware, Inc. All rights reserved.
%%
-module(rabbit_prelaunch).
-export([start/0, stop/0]).
-define(BaseApps, [rabbit]).
-define(ERROR_CODE, 1).
%%----------------------------------------------------------------------------
%% Specs
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(start/0 :: () -> no_return()).
-spec(stop/0 :: () -> 'ok').
%% Shut dialyzer up
-spec(terminate/1 :: (string()) -> no_return()).
-spec(terminate/2 :: (string(), [any()]) -> no_return()).
-endif.
%%----------------------------------------------------------------------------
start() ->
io:format("Activating RabbitMQ plugins ...~n"),
%% Determine our various directories
[PluginDir, UnpackedPluginDir, NodeStr] = init:get_plain_arguments(),
RootName = UnpackedPluginDir ++ "/rabbit",
%% Unpack any .ez plugins
unpack_ez_plugins(PluginDir, UnpackedPluginDir),
%% Build a list of required apps based on the fixed set, and any plugins
PluginApps = find_plugins(PluginDir) ++ find_plugins(UnpackedPluginDir),
RequiredApps = ?BaseApps ++ PluginApps,
%% Build the entire set of dependencies - this will load the
%% applications along the way
AllApps = case catch sets:to_list(expand_dependencies(RequiredApps)) of
{failed_to_load_app, App, Err} ->
terminate("failed to load application ~s:~n~p",
[App, Err]);
AppList ->
AppList
end,
AppVersions = [determine_version(App) || App <- AllApps],
RabbitVersion = proplists:get_value(rabbit, AppVersions),
%% Build the overall release descriptor
RDesc = {release,
{"rabbit", RabbitVersion},
{erts, erlang:system_info(version)},
AppVersions},
%% Write it out to $RABBITMQ_PLUGINS_EXPAND_DIR/rabbit.rel
rabbit_misc:write_file(RootName ++ ".rel", io_lib:format("~p.~n", [RDesc])),
%% We exclude mochiweb due to its optional use of fdsrv.
XRefExclude = [mochiweb],
%% Compile the script
ScriptFile = RootName ++ ".script",
case systools:make_script(RootName, [local, silent,
{exref, AllApps -- XRefExclude}]) 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. On Ubuntu, we also get warnings
%% about kernel/stdlib sources being out of date, which we
%% also ignore for the same reason.
WarningStr = Module:format_warning(
[W || W <- Warnings,
case W of
{warning, {source_not_found, _}} -> false;
{warning, {obj_out_of_date, {_,_,WApp,_,_}}}
when WApp == mnesia;
WApp == stdlib;
WApp == kernel;
WApp == sasl;
WApp == crypto;
WApp == os_mon -> false;
_ -> true
end]),
case length(WarningStr) of
0 -> ok;
_ -> S = string:copies("*", 80),
io:format("~n~s~n~s~s~n~n", [S, WarningStr, S])
end,
ok;
{error, Module, Error} ->
terminate("generation of boot script file ~s failed:~n~s",
[ScriptFile, Module:format_error(Error)])
end,
case post_process_script(ScriptFile) of
ok -> ok;
{error, Reason} ->
terminate("post processing of boot script file ~s failed:~n~w",
[ScriptFile, Reason])
end,
case systools:script2boot(RootName) of
ok -> ok;
error -> terminate("failed to compile boot script file ~s",
[ScriptFile])
end,
io:format("~w plugins activated:~n", [length(PluginApps)]),
[io:format("* ~s-~s~n", [App, proplists:get_value(App, AppVersions)])
|| App <- PluginApps],
io:nl(),
ok = duplicate_node_check(NodeStr),
terminate(0),
ok.
stop() ->
ok.
determine_version(App) ->
application:load(App),
{ok, Vsn} = application:get_key(App, vsn),
{App, Vsn}.
delete_recursively(Fn) ->
case rabbit_misc:recursive_delete([Fn]) of
ok -> ok;
{error, {Path, E}} -> {error, {cannot_delete, Path, E}};
Error -> Error
end.
unpack_ez_plugins(SrcDir, DestDir) ->
%% Eliminate the contents of the destination directory
case delete_recursively(DestDir) of
ok -> ok;
{error, E} -> terminate("Could not delete dir ~s (~p)", [DestDir, E])
end,
case filelib:ensure_dir(DestDir ++ "/") of
ok -> ok;
{error, E2} -> terminate("Could not create dir ~s (~p)", [DestDir, E2])
end,
[unpack_ez_plugin(PluginName, DestDir) ||
PluginName <- filelib:wildcard(SrcDir ++ "/*.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;
{error, Reason} ->
throw({failed_to_load_app, Next, Reason})
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.
post_process_script(ScriptFile) ->
case file:consult(ScriptFile) of
{ok, [{script, Name, Entries}]} ->
NewEntries = lists:flatmap(fun process_entry/1, Entries),
case file:open(ScriptFile, [write]) of
{ok, Fd} ->
io:format(Fd, "%% script generated at ~w ~w~n~p.~n",
[date(), time(), {script, Name, NewEntries}]),
file:close(Fd),
ok;
{error, OReason} ->
{error, {failed_to_open_script_file_for_writing, OReason}}
end;
{error, Reason} ->
{error, {failed_to_load_script, Reason}}
end.
process_entry(Entry = {apply,{application,start_boot,[mnesia,permanent]}}) ->
[{apply,{rabbit,prepare,[]}}, Entry];
process_entry(Entry) ->
[Entry].
%% Check whether a node with the same name is already running
duplicate_node_check([]) ->
%% Ignore running node while installing windows service
ok;
duplicate_node_check(NodeStr) ->
Node = rabbit_misc:makenode(NodeStr),
{NodeName, NodeHost} = rabbit_misc:nodeparts(Node),
case net_adm:names(NodeHost) of
{ok, NamePorts} ->
case proplists:is_defined(NodeName, NamePorts) of
true -> io:format("node with name ~p "
"already running on ~p~n",
[NodeName, NodeHost]),
[io:format(Fmt ++ "~n", Args) ||
{Fmt, Args} <- rabbit_control:diagnostics(Node)],
terminate(?ERROR_CODE);
false -> ok
end;
{error, EpmdReason} ->
terminate("epmd error for host ~p: ~p (~s)~n",
[NodeHost, EpmdReason,
case EpmdReason of
address -> "unable to establish tcp connection";
_ -> inet:format_error(EpmdReason)
end])
end.
terminate(Fmt, Args) ->
io:format("ERROR: " ++ Fmt ++ "~n", Args),
terminate(?ERROR_CODE).
terminate(Status) ->
case os:type() of
{unix, _} -> halt(Status);
{win32, _} -> init:stop(Status),
receive
after infinity -> ok
end
end.
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