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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2020. All Rights Reserved.
%%
%% 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.
%%
%% %CopyrightEnd%
%%
-module(server).
%%
%% An example Diameter server that answers the base protocol ACR sent
%% by the client example.
%%
%% Simplest usage to listen on TCP at 127.0.0.1:3868:
%%
%% server:start().
%% server:listen(tcp).
%%
%% Interface.
-export([start/1, %% start a service
start/2, %%
listen/2, %% add a listening transport
stop/1]). %% stop a service
%% Convenience functions using the default service name.
-export([start/0,
listen/1,
stop/0]).
%% Internal callback.
-export([message/3]).
-define(DEF_SVC_NAME, ?MODULE).
%% The service configuration. In a server supporting multiple Diameter
%% applications each application may have its own, although they could all
%% be configured with a common callback module.
-define(SERVICE(Name), [{'Origin-Host', atom_to_list(Name) ++ ".example.com"},
{'Origin-Realm', "example.com"},
{'Vendor-Id', 193},
{'Product-Name', "Server"},
{'Auth-Application-Id', [0]},
{decode_format, map},
{restrict_connections, false},
{strict_mbit, false},
{string_decode, false},
{application, [{alias, common},
{dictionary, diameter_gen_base_rfc6733},
{module, server_cb},
{call_mutates_state, false}]}]).
%% start/2
start(Name, Opts) ->
Defaults = [T || {K,_} = T <- ?SERVICE(Name),
not lists:keymember(K, 1, Opts)],
diameter:start_service(Name, Opts ++ Defaults).
%% start/1
start(Opts) ->
start(?DEF_SVC_NAME, Opts).
%% start/0
start() ->
start(?DEF_SVC_NAME, []).
%% listen/2
listen(Name, Opts)
when is_list(Opts) ->
diameter:add_transport(Name, {listen, lists:flatmap(fun opts/1, Opts)});
%% backwards compatibility with old config
listen(Name, {T, Opts}) ->
listen(Name, [T | Opts]);
listen(Name, T) ->
listen(Name, [T]).
%% listen/1
listen(Opts) ->
listen(?DEF_SVC_NAME, Opts).
%% stop/1
stop(Name) ->
diameter:stop_service(Name).
%% stop/0
stop() ->
stop(?DEF_SVC_NAME).
%% ===========================================================================
%% opts/1
%%
%% Map a 3-tuple a transport_module/transport_config pair as a
%% convenience, pass everything else unmodified.
opts(T)
when T == tcp;
T == sctp ->
opts({T, loopback, default});
opts({tcp, Addr, Port}) ->
opts({diameter_tcp, Addr, Port});
opts({sctp, Addr, Port}) ->
opts({diameter_sctp, Addr, Port});
opts({Mod, loopback, Port}) ->
opts({Mod, {127,0,0,1}, Port});
opts({Mod, Addr, default}) ->
opts({Mod, Addr, 3868});
opts({Mod, Addr, Port}) ->
[{transport_module, Mod},
{transport_config, [{reuseaddr, true},
{sender, true},
{message_cb, {?MODULE, message, [0]}},
{ip, Addr},
{port, Port}]}];
opts(T) ->
[T].
%% message/3
%%
%% Simple message callback that limits the number of concurrent
%% requests on the peer connection in question.
%% Incoming request.
message(recv, <<_:32, 1:1, _/bits>> = Bin, N) ->
[Bin, N < 32, {?MODULE, message, [N+1]}];
%% Outgoing request.
message(ack, <<_:32, 1:1, _/bits>>, _) ->
[];
%% Incoming answer or request discarded.
message(ack, _, N) ->
[N =< 32, {?MODULE, message, [N-1]}];
%% Outgoing message or incoming answer.
message(_, Bin, _) ->
[Bin].
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