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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 GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_sasl_report_file_h).
-include("rabbit.hrl").
-behaviour(gen_event).
-export([init/1, handle_event/2, handle_call/2, handle_info/2, terminate/2,
code_change/3]).
-import(rabbit_error_logger_file_h, [safe_handle_event/3]).
%% rabbit_sasl_report_file_h is a wrapper around the sasl_report_file_h
%% module because the original's init/1 does not match properly
%% with the result of closing the old handler when swapping handlers.
%% The first init/1 additionally allows for simple log rotation
%% when the suffix is not the empty string.
%% The original init/1 also opened the file in 'write' mode, thus
%% overwriting old logs. To remedy this, init/1 from
%% lib/sasl/src/sasl_report_file_h.erl from R14B3 was copied as
%% init_file/1 and changed so that it opens the file in 'append' mode.
%% Used only when swapping handlers and performing
%% log rotation
init({{File, Suffix}, []}) ->
case rabbit_file:append_file(File, Suffix) of
ok -> file:delete(File),
ok;
{error, Error} ->
rabbit_log:error("Failed to append contents of "
"sasl log file '~s' to '~s':~n~p~n",
[File, [File, Suffix], Error])
end,
init(File);
%% Used only when swapping handlers and the original handler
%% failed to terminate or was never installed
init({{File, _}, error}) ->
init(File);
%% Used only when swapping handlers without
%% doing any log rotation
init({File, []}) ->
init(File);
init({File, _Type} = FileInfo) ->
rabbit_file:ensure_parent_dirs_exist(File),
init_file(FileInfo);
init(File) ->
rabbit_file:ensure_parent_dirs_exist(File),
init_file({File, sasl_error_logger_type()}).
init_file({File, Type}) ->
process_flag(trap_exit, true),
case file:open(File, [append]) of
{ok,Fd} -> {ok, {Fd, File, Type}};
Error -> Error
end.
handle_event(Event, State) ->
safe_handle_event(fun handle_event0/2, Event, State).
handle_event0(Event, State) ->
sasl_report_file_h:handle_event(
truncate:log_event(Event, ?LOG_TRUNC), State).
handle_info(Info, State) ->
sasl_report_file_h:handle_info(Info, State).
handle_call(Call, State) ->
sasl_report_file_h:handle_call(Call, State).
terminate(Reason, State) ->
sasl_report_file_h:terminate(Reason, State).
code_change(_OldVsn, State, _Extra) ->
%% There is no sasl_report_file_h:code_change/3
{ok, State}.
%%----------------------------------------------------------------------
sasl_error_logger_type() ->
case application:get_env(sasl, errlog_type) of
{ok, error} -> error;
{ok, progress} -> progress;
{ok, all} -> all;
{ok, Bad} -> throw({error, {wrong_errlog_type, Bad}});
_ -> all
end.
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