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% Licensed 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.
-module(couch_log_writer_file).
-behaviour(couch_log_writer).
-export([
init/0,
terminate/2,
write/2
]).
-include_lib("kernel/include/file.hrl").
-include("couch_log.hrl").
-record(st, {
file_path,
fd,
inode,
last_check
}).
-define(CHECK_INTERVAL, 30000000).
-ifdef(TEST).
-export([
maybe_reopen/1
]).
-endif.
init() ->
FilePath = config:get("log", "file", "./couch.log"),
Opts = [append, raw] ++ buffer_opt(),
case filelib:ensure_dir(FilePath) of
ok ->
case file:open(FilePath, Opts) of
{ok, Fd} ->
case file:read_file_info(FilePath) of
{ok, FInfo} ->
{ok, #st{
file_path = FilePath,
fd = Fd,
inode = FInfo#file_info.inode,
last_check = os:timestamp()
}};
FInfoError ->
ok = file:close(Fd),
FInfoError
end;
OpenError ->
OpenError
end;
EnsureDirError ->
EnsureDirError
end.
terminate(_, St) ->
% Apparently delayed_write can require two closes
file:close(St#st.fd),
file:close(St#st.fd),
ok.
write(Entry, St) ->
{ok, NewSt} = maybe_reopen(St),
#log_entry{
level = Level,
pid = Pid,
msg = Msg,
msg_id = MsgId,
time_stamp = TimeStamp
} = couch_log_util:maybe_format_type(Entry),
Fmt = "[~s] ~s ~s ~p ~s ",
Args = [
couch_log_util:level_to_string(Level),
TimeStamp,
node(),
Pid,
MsgId
],
MsgSize = couch_log_config:get(max_message_size),
Data = couch_log_trunc_io:format(Fmt, Args, MsgSize),
ok = file:write(NewSt#st.fd, [Data, Msg, "\n"]),
{ok, NewSt}.
buffer_opt() ->
WriteBuffer = config:get_integer("log", "write_buffer", 0),
WriteDelay = config:get_integer("log", "write_delay", 0),
case {WriteBuffer, WriteDelay} of
{B, D} when is_integer(B), is_integer(D), B > 0, D > 0 ->
[{delayed_write, B, D}];
_ ->
[]
end.
maybe_reopen(St) ->
#st{
last_check = LastCheck
} = St,
Now = os:timestamp(),
case timer:now_diff(Now, LastCheck) > ?CHECK_INTERVAL of
true ->
NewSt = St#st{last_check = Now},
reopen(NewSt);
false ->
{ok, St}
end.
reopen(St) ->
case file:read_file_info(St#st.file_path) of
{ok, FInfo} ->
NewINode = FInfo#file_info.inode,
case NewINode == St#st.inode of
true ->
% No rotate necessary
{ok, St};
false ->
% File was moved and re-created
terminate(rotating, St),
init()
end;
_ ->
% File was moved or deleted
terminate(rotating, St),
init()
end.
|
