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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2010-2011. 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).
+
+-export([report/2, info_report/2,
+ error_report/2,
+ warning_report/2,
+ now_diff/1,
+ time/1,
+ eval/1,
+ ip4address/1,
+ ip6address/1,
+ ipaddr/1,
+ spawn_opts/2,
+ wait/1,
+ fold_tuple/3]).
+
+-include("diameter_internal.hrl").
+
+%% ---------------------------------------------------------------------------
+%% # info_report(Reason, MFA)
+%%
+%% Input: Reason = Arbitrary term indicating the reason for the report.
+%% MFA = {Module, Function, Args} to report.
+%%
+%% Output: true
+%% ---------------------------------------------------------------------------
+
+report(Reason, MFA) ->
+ info_report(Reason, MFA).
+
+info_report(Reason, {M,F,A}) ->
+ error_logger:info_report(" Reason: ~p~n"
+ " Pid: ~p~n"
+ " Node: ~p~n"
+ " Module: ~p~n"
+ " Function: ~p~n"
+ "Arguments: ~p~n",
+ [Reason, self(), node(), M, F, A]).
+
+%%% ---------------------------------------------------------------------------
+%%% # error_report(Reason, MFA)
+%%% # warning_report(Reason, MFA)
+%%%
+%%% Output: false
+%%% ---------------------------------------------------------------------------
+
+error_report(Reason, MFA) ->
+ report(fun error_logger:error_report/1, Reason, MFA).
+
+warning_report(Reason, MFA) ->
+ report(fun error_logger:warning_report/1, Reason, MFA).
+
+report(Fun, Reason, MFA) ->
+ Fun([{reason, Reason}, {who, self()}, {where, node()}, {what, MFA}]),
+ false.
+
+%%% ---------------------------------------------------------------------------
+%%% # now_diff(Time)
+%%%
+%%% Description: Return timer:now_diff(now(), Time) as an {H, M, S, MicroS}
+%%% tuple instead of as integer microseconds.
+%%% ---------------------------------------------------------------------------
+
+now_diff({_,_,_} = Time) ->
+ time(timer:now_diff(erlang:now(), Time)).
+
+%%% ---------------------------------------------------------------------------
+%%% # time(Time)
+%%%
+%%% Input: Time = {MegaSec, Sec, MicroSec}
+%%% | MicroSec
+%%%
+%%% Output: {H, M, S, MicroS}
+%%% ---------------------------------------------------------------------------
+
+time({_,_,_} = Time) -> %% time of day
+ %% 24 hours = 24*60*60*1000000 = 86400000000 microsec
+ time(timer:now_diff(Time, {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}.
+
+%%% ---------------------------------------------------------------------------
+%%% # eval(Func)
+%%% ---------------------------------------------------------------------------
+
+eval({M,F,A}) ->
+ apply(M,F,A);
+
+eval([{M,F,A} | X]) ->
+ apply(M, F, X ++ A);
+
+eval([[F|A] | X]) ->
+ eval([F | X ++ A]);
+
+eval([F|A]) ->
+ apply(F,A);
+
+eval({F}) ->
+ eval(F);
+
+eval(F) ->
+ F().
+
+%%% ---------------------------------------------------------------------------
+%%% # ip4address(Addr)
+%%%
+%%% Input: string() (eg. "10.0.0.1")
+%%% | list of integer()
+%%% | tuple of integer()
+%%%
+%%% Output: {_,_,_,_} of integer
+%%%
+%%% Exceptions: error: {invalid_address, Addr, erlang:get_stacktrace()}
+%%% ---------------------------------------------------------------------------
+
+ip4address([_,_,_,_] = Addr) -> %% Length 4 string can't be an address.
+ ipaddr(list_to_tuple(Addr));
+
+%% Be brutal.
+ip4address(Addr) ->
+ try
+ {_,_,_,_} = ipaddr(Addr)
+ catch
+ error: _ ->
+ erlang:error({invalid_address, Addr, ?STACK})
+ end.
+
+%%% ---------------------------------------------------------------------------
+%%% # ip6address(Addr)
+%%%
+%%% Input: string() (eg. "1080::8:800:200C:417A")
+%%% | list of integer()
+%%% | tuple of integer()
+%%%
+%%% Output: {_,_,_,_,_,_,_,_} of integer
+%%%
+%%% Exceptions: error: {invalid_address, Addr, erlang:get_stacktrace()}
+%%% ---------------------------------------------------------------------------
+
+ip6address([_,_,_,_,_,_,_,_] = Addr) -> %% Length 8 string can't be an address.
+ ipaddr(list_to_tuple(Addr));
+
+%% Be brutal.
+ip6address(Addr) ->
+ try
+ {_,_,_,_,_,_,_,_} = ipaddr(Addr)
+ catch
+ error: _ ->
+ erlang:error({invalid_address, Addr, ?STACK})
+ end.
+
+%%% ---------------------------------------------------------------------------
+%%% # ipaddr(Addr)
+%%%
+%%% Input: string() | tuple of integer()
+%%%
+%%% Output: {_,_,_,_} | {_,_,_,_,_,_,_,_}
+%%%
+%%% Exceptions: error: {invalid_address, erlang:get_stacktrace()}
+%%% ---------------------------------------------------------------------------
+
+-spec ipaddr(string() | tuple())
+ -> inet:ip_address().
+
+%% 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, ?STACK})
+ 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(Type, Opts)
+%%% ---------------------------------------------------------------------------
+
+%% TODO: config variables.
+
+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(MRefs)
+%%% ---------------------------------------------------------------------------
+
+wait(L) ->
+ w([erlang:monitor(process, P) || P <- L]).
+
+w([]) ->
+ ok;
+w(L) ->
+ receive
+ {'DOWN', MRef, process, _, _} ->
+ w(lists:delete(MRef, L))
+ end.
+
+%%% ---------------------------------------------------------------------------
+%%% # fold_tuple(N, T0, T)
+%%% ---------------------------------------------------------------------------
+
+%% 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, T) ->
+ element(2, lists:foldl(fun(X, {M,_} = A) -> {M+1, ft(X, A)} end,
+ {N, T0},
+ lists:nthtail(N-1, tuple_to_list(T)))).
+
+ft(undefined, T) ->
+ T;
+ft(X, {N, T}) ->
+ setelement(N, T, X).
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