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-module (mod_http_fileserver_log).
-behaviour (gen_server).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
-export ([start_link/2,start/2, stop/1, add_to_log/4,reopen_log/1]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("ejabberd_http.hrl").
-include_lib("kernel/include/file.hrl").
-define(PROCNAME, ejabberd_mod_http_fileserver_log).
-record(state, {host,accesslog, accesslogfd}).
%% Public API
start(Host, Filename) ->
Proc =gen_mod:get_module_proc(Host, ?PROCNAME),
ChildSpec =
{Proc,
{?MODULE, start_link, [Host, Filename]},
transient, % if process crashes abruptly, it gets restarted
1000,
worker,
[?MODULE]},
supervisor:start_child(ejabberd_sup, ChildSpec).
stop(Host) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
gen_server:call(Proc, stop),
supervisor:terminate_child(ejabberd_sup, Proc),
supervisor:delete_child(ejabberd_sup, Proc).
start_link(Host, Filename) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
gen_server:start_link({local, Proc}, ?MODULE, [Host, Filename], []).
add_to_log(Host,FileSize, Code, Request) ->
gen_server:cast(gen_mod:get_module_proc(Host, ?PROCNAME),
{add_to_log, FileSize, Code, Request}).
reopen_log(Host) ->
gen_server:cast(gen_mod:get_module_proc(Host, ?PROCNAME), reopen_log).
%% Server implementation, a.k.a.: callbacks
init([Host, Filename]) ->
try try_open_log(Filename, Host) of
AccessLogFD ->
?DEBUG("File opened !", []),
{ok, #state{host = Host,
accesslog = Filename,
accesslogfd = AccessLogFD}}
catch
throw:Reason ->
{stop, Reason}
end.
try_open_log(FN, Host) ->
FD = try open_log(FN) of
FD1 -> FD1
catch
throw:{cannot_open_accesslog, FN, Reason} ->
?ERROR_MSG("Cannot open access log file: ~p~nReason: ~p", [FN, Reason]),
undefined
end,
%HostB = list_to_binary(Host),
ejabberd_hooks:add(reopen_log_hook, Host, ?MODULE, reopen_log, 50),
FD.
handle_call(_Request, _From, State) ->
{reply, ok, State}.
handle_cast({add_to_log, FileSize, Code, Request}, State) ->
add_to_log2(State#state.accesslogfd, FileSize, Code, Request),
{noreply, State};
handle_cast(reopen_log, State) ->
FD2 = reopen_log(State#state.accesslog, State#state.accesslogfd),
{noreply, State#state{accesslogfd = FD2}};
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, State) ->
close_log(State#state.accesslogfd),
ejabberd_hooks:delete(reopen_log_hook, State#state.host, ?MODULE, reopen_log, 50),
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%----------------------------------------------------------------------
%% Log file
%%----------------------------------------------------------------------
open_log(FN) ->
case file:open(FN, [append]) of
{ok, FD} ->
FD;
{error, Reason} ->
throw({cannot_open_accesslog, FN, Reason})
end.
close_log(FD) ->
file:close(FD).
reopen_log(undefined, undefined) ->
ok;
reopen_log(FN, FD) ->
?DEBUG("reopening logs", []),
close_log(FD),
open_log(FN).
add_to_log2(undefined, _FileSize, _Code, _Request) ->
ok;
add_to_log2(File, FileSize, Code, Request) ->
{{Year, Month, Day}, {Hour, Minute, Second}} = calendar:local_time(),
IP = ip_to_string(element(1, Request#request.ip)),
Path = join(Request#request.path, "/"),
Query = case join(lists:map(fun(E) -> lists:concat([element(1, E), "=", element(2, E)]) end,
Request#request.q), "&") of
[] ->
"";
String ->
[$? | String]
end,
UserAgent = find_header('User-Agent', Request#request.headers, "-"),
Referer = find_header('Referer', Request#request.headers, "-"),
%% Pseudo Combined Apache log format:
%% 127.0.0.1 - - [28/Mar/2007:18:41:55 +0200] "GET / HTTP/1.1" 302 303 "-" "tsung"
%% TODO some fields are harcoded/missing:
%% The date/time integers should have always 2 digits. For example day "7" should be "07"
%% Month should be 3*letter, not integer 1..12
%% Missing time zone = (`+' | `-') 4*digit
%% Missing protocol version: HTTP/1.1
%% For reference: http://httpd.apache.org/docs/2.2/logs.html
io:format(File, "~s - - [~p/~p/~p:~p:~p:~p] \"~s /~s~s\" ~p ~p ~p ~p~n",
[IP, Day, Month, Year, Hour, Minute, Second, Request#request.method, Path, Query, Code,
FileSize, Referer, UserAgent]).
find_header(Header, Headers, Default) ->
case lists:keysearch(Header, 1, Headers) of
{value, {_, Value}} -> Value;
false -> Default
end.
join([], _) ->
"";
join([E], _) ->
E;
join([H | T], Separator) ->
lists:foldl(fun(E, Acc) -> lists:concat([Acc, Separator, E]) end, H, T).
%% Convert IP address tuple to string representation. Accepts either
%% IPv4 or IPv6 address tuples.
ip_to_string(Address) when size(Address) == 4 ->
join(tuple_to_list(Address), ".");
ip_to_string(Address) when size(Address) == 8 ->
Parts = lists:map(fun (Int) -> io_lib:format("~.16B", [Int]) end, tuple_to_list(Address)),
string:to_lower(lists:flatten(join(Parts, ":"))).
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