%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2015. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% 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.
%%
%% %CopyrightEnd%
%%
-module(diameter_lib).
-compile({no_auto_import, [now/0]}).
-export([info_report/2,
error_report/2,
warning_report/2,
now/0,
timestamp/1,
now_diff/1,
micro_diff/1,
micro_diff/2,
time/1,
seed/0,
eval/1,
eval_name/1,
get_stacktrace/0,
ipaddr/1,
spawn_opts/2,
wait/1,
fold_tuple/3,
fold_n/3,
for_n/2,
log/4]).
%% ---------------------------------------------------------------------------
%% # get_stacktrace/0
%% ---------------------------------------------------------------------------
%% Return a stacktrace with a leading, potentially large, argument
%% list replaced by an arity. Trace on stacktrace/0 to see the
%% original.
get_stacktrace() ->
stacktrace(erlang:get_stacktrace()).
stacktrace([{M,F,A,L} | T]) when is_list(A) ->
[{M, F, length(A), L} | T];
stacktrace(L) ->
L.
%% ---------------------------------------------------------------------------
%% # info_report/2
%% ---------------------------------------------------------------------------
-spec info_report(Reason :: term(), T :: term())
-> true.
info_report(Reason, T) ->
report(fun error_logger:info_report/1, Reason, T),
true.
%% ---------------------------------------------------------------------------
%% # error_report/2
%% # warning_report/2
%% ---------------------------------------------------------------------------
-spec error_report(Reason :: term(), T :: term())
-> false.
error_report(Reason, T) ->
report(fun error_logger:error_report/1, Reason, T).
-spec warning_report(Reason :: term(), T :: term())
-> false.
warning_report(Reason, T) ->
report(fun error_logger:warning_report/1, Reason, T).
report(Fun, Reason, T) ->
Fun(io_lib:format("diameter: ~" ++ fmt(Reason) ++ "~n ~p~n",
[Reason, T])),
false.
fmt(T) ->
if is_list(T) ->
"s";
true ->
"p"
end.
%% ---------------------------------------------------------------------------
%% # now/0
%% ---------------------------------------------------------------------------
-type timestamp() :: {non_neg_integer(), 0..999999, 0..999999}.
-type now() :: integer() %% monotonic time
| timestamp().
-spec now()
-> now().
%% Use monotonic time if it exists, fall back to erlang:now()
%% otherwise.
now() ->
try
erlang:monotonic_time()
catch
error: undef -> erlang:now()
end.
%% ---------------------------------------------------------------------------
%% # timestamp/1
%% ---------------------------------------------------------------------------
-spec timestamp(NowT :: now())
-> timestamp().
timestamp({_,_,_} = T) -> %% erlang:now()
T;
timestamp(MonoT) -> %% monotonic time
MicroSecs = erlang:convert_time_resolution(MonoT + erlang:time_offset(),
erlang:time_resolution(),
1000000),
Secs = MicroSecs div 1000000,
{Secs div 1000000, Secs rem 1000000, MicroSecs rem 1000000}.
%% ---------------------------------------------------------------------------
%% # now_diff/1
%% ---------------------------------------------------------------------------
-spec now_diff(NowT :: now())
-> {Hours, Mins, Secs, MicroSecs}
when Hours :: non_neg_integer(),
Mins :: 0..59,
Secs :: 0..59,
MicroSecs :: 0..999999.
%% Return timer:now_diff(now(), NowT) as an {H, M, S, MicroS} tuple
%% instead of as integer microseconds.
now_diff(Time) ->
time(micro_diff(Time)).
%% ---------------------------------------------------------------------------
%% # micro_diff/1
%% ---------------------------------------------------------------------------
-spec micro_diff(NowT :: now())
-> MicroSecs
when MicroSecs :: non_neg_integer().
micro_diff({_,_,_} = T0) ->
timer:now_diff(erlang:now(), T0);
micro_diff(T0) -> %% monotonic time
erlang:convert_time_resolution(erlang:monotonic_time() - T0,
erlang:time_resolution(),
1000000).
%% ---------------------------------------------------------------------------
%% # micro_diff/2
%% ---------------------------------------------------------------------------
-spec micro_diff(T1 :: now(), T0 :: now())
-> MicroSecs
when MicroSecs :: non_neg_integer().
micro_diff(T1, T0)
when is_integer(T1), is_integer(T0) -> %% monotonic time
erlang:convert_time_resolution(T1 - T0,
erlang:time_resolution(),
1000000);
micro_diff(T1, T0) -> %% at least one erlang:now()
timer:now_diff(timestamp(T1), timestamp(T0)).
%% ---------------------------------------------------------------------------
%% # time/1
%%
%% Return an elapsed time as an {H, M, S, MicroS} tuple.
%% ---------------------------------------------------------------------------
-spec time(NowT | Diff)
-> {Hours, Mins, Secs, MicroSecs}
when NowT :: timestamp(),
Diff :: non_neg_integer(),
Hours :: non_neg_integer(),
Mins :: 0..59,
Secs :: 0..59,
MicroSecs :: 0..999999.
time({_,_,_} = NowT) -> %% time of day
%% 24 hours = 24*60*60*1000000 = 86400000000 microsec
time(timer:now_diff(NowT, {0,0,0}) rem 86400000000);
time(Micro) -> %% elapsed time
Seconds = Micro div 1000000,
H = Seconds div 3600,
M = (Seconds rem 3600) div 60,
S = Seconds rem 60,
{H, M, S, Micro rem 1000000}.
%% ---------------------------------------------------------------------------
%% # seed/0
%% ---------------------------------------------------------------------------
-spec seed()
-> {timestamp(), {integer(), integer(), integer()}}.
%% Return an argument for random:seed/1.
seed() ->
T = now(),
{timestamp(T), seed(T)}.
%% seed/1
seed({_,_,_} = T) ->
T;
seed(T) -> %% monotonic time
{erlang:phash2(node()), T, erlang:unique_integer()}.
%% ---------------------------------------------------------------------------
%% # eval/1
%%
%% Evaluate a function in various forms.
%% ---------------------------------------------------------------------------
-type f() :: {module(), atom(), list()}
| nonempty_maybe_improper_list(fun(), list())
| fun().
-spec eval(Fun)
-> term()
when Fun :: f()
| {f()}
| nonempty_maybe_improper_list(f(), list()).
eval({M,F,A}) ->
apply(M,F,A);
eval([{M,F,A} | X]) ->
apply(M, F, X ++ A);
eval([[F|X] | A]) ->
eval([F | A ++ X]);
eval([F|A]) ->
apply(F,A);
eval({F}) ->
eval(F);
eval(F) ->
F().
%% ---------------------------------------------------------------------------
%% eval_name/1
%% ---------------------------------------------------------------------------
eval_name({M,F,A}) ->
{M, F, length(A)};
eval_name([{M,F,A} | X]) ->
{M, F, length(A) + length(X)};
eval_name([[F|A] | X]) ->
eval_name([F | X ++ A]);
eval_name([F|_]) ->
F;
eval_name({F}) ->
eval_name(F);
eval_name(F) ->
F.
%% ---------------------------------------------------------------------------
%% # ipaddr/1
%%
%% Parse an IP address.
%% ---------------------------------------------------------------------------
-spec ipaddr([byte()] | tuple())
-> inet:ip_address()
| none().
%% Don't convert lists of integers since a length 8 list like
%% [$1,$0,$.,$0,$.,$0,$.,$1] is ambiguous: is it "10.0.0.1" or
%% "49:48:46:48:46:48:46:49"?
%%
%% RFC 2373 defines the format parsed for v6 addresses.
%% Be brutal.
ipaddr(Addr) ->
try
ip(Addr)
catch
error: _ ->
erlang:error({invalid_address, erlang:get_stacktrace()})
end.
%% Already a tuple: ensure non-negative integers of the right size.
ip(T)
when size(T) == 4;
size(T) == 8 ->
Bs = 2*size(T),
[] = lists:filter(fun(N) when 0 =< N -> 0 < N bsr Bs end,
tuple_to_list(T)),
T;
%% Or not: convert from '.'/':'-separated decimal/hex.
ip(Addr) ->
{ok, A} = inet_parse:address(Addr), %% documented in inet(3)
A.
%% ---------------------------------------------------------------------------
%% # spawn_opts/2
%% ---------------------------------------------------------------------------
-spec spawn_opts(server|worker, list())
-> list().
spawn_opts(server, Opts) ->
opts(75000, Opts);
spawn_opts(worker, Opts) ->
opts(5000, Opts).
opts(HeapSize, Opts) ->
[{min_heap_size, HeapSize} | lists:keydelete(min_heap_size, 1, Opts)].
%% ---------------------------------------------------------------------------
%% # wait/1
%% ---------------------------------------------------------------------------
-spec wait([pid() | reference()])
-> ok.
wait(L) ->
lists:foreach(fun down/1, L).
down(Pid)
when is_pid(Pid) ->
down(monitor(process, Pid));
down(MRef)
when is_reference(MRef) ->
receive {'DOWN', MRef, process, _, _} = T -> T end.
%% ---------------------------------------------------------------------------
%% # fold_tuple/3
%% ---------------------------------------------------------------------------
-spec fold_tuple(N, T0, T)
-> tuple()
when N :: pos_integer(),
T0 :: tuple(),
T :: tuple()
| undefined.
%% Replace fields in T0 by those of T starting at index N, unless the
%% new value is 'undefined'.
%%
%% eg. fold_tuple(2, Hdr, #diameter_header{end_to_end_id = 42})
fold_tuple(_, T, undefined) ->
T;
fold_tuple(N, T0, T1) ->
{_, T} = lists:foldl(fun(V, {I,_} = IT) -> {I+1, ft(V, IT)} end,
{N, T0},
lists:nthtail(N-1, tuple_to_list(T1))),
T.
ft(undefined, {_, T}) ->
T;
ft(Value, {Idx, T}) ->
setelement(Idx, T, Value).
%% ---------------------------------------------------------------------------
%% # fold_n/3
%% ---------------------------------------------------------------------------
-spec fold_n(F, Acc0, N)
-> term()
when F :: fun((non_neg_integer(), term()) -> term()),
Acc0 :: term(),
N :: non_neg_integer().
fold_n(F, Acc, N)
when is_integer(N), 0 < N ->
fold_n(F, F(N, Acc), N-1);
fold_n(_, Acc, _) ->
Acc.
%% ---------------------------------------------------------------------------
%% # for_n/2
%% ---------------------------------------------------------------------------
-spec for_n(F, N)
-> non_neg_integer()
when F :: fun((non_neg_integer()) -> term()),
N :: non_neg_integer().
for_n(F, N) ->
fold_n(fun(M,A) -> F(M), A+1 end, 0, N).
%% ---------------------------------------------------------------------------
%% # log/4
%%
%% Called to have something to trace on for happenings of interest.
%% ---------------------------------------------------------------------------
log(_Slogan, _Mod, _Line, _Details) ->
ok.
