From 18449b6bd35be4ad66ea7874a397029c8c920629 Mon Sep 17 00:00:00 2001
From: Anders Svensson <anders@erlang.org>
Date: Wed, 4 May 2016 23:27:02 +0200
Subject: Add diameter:peer_find/1

To return a peer_fsm/transport pair given one of them.
---
 lib/diameter/src/base/diameter.erl          | 12 ++++++++++++
 lib/diameter/src/base/diameter_peer_fsm.erl | 26 +++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

(limited to 'lib/diameter')

diff --git a/lib/diameter/src/base/diameter.erl b/lib/diameter/src/base/diameter.erl
index b04697513e..e8f2f63f86 100644
--- a/lib/diameter/src/base/diameter.erl
+++ b/lib/diameter/src/base/diameter.erl
@@ -37,6 +37,7 @@
 %% Information.
 -export([services/0,
          peer_info/1,
+         peer_find/1,
          service_info/2]).
 
 %% Start/stop the application. In a "real" application this should
@@ -158,6 +159,17 @@ service_info(SvcName, Option) ->
 peer_info(PeerRef) ->
     diameter_service:peer_info(PeerRef).
 
+%% ---------------------------------------------------------------------------
+%% peer_find/1
+%% ---------------------------------------------------------------------------
+
+-spec peer_find(peer_ref() | pid())
+   -> {peer_ref(), pid()}
+    | false.
+
+peer_find(Pid) ->
+    diameter_peer_fsm:find(Pid).
+
 %% ---------------------------------------------------------------------------
 %% add_transport/3
 %% ---------------------------------------------------------------------------
diff --git a/lib/diameter/src/base/diameter_peer_fsm.erl b/lib/diameter/src/base/diameter_peer_fsm.erl
index 2b23183d18..cdc97775eb 100644
--- a/lib/diameter/src/base/diameter_peer_fsm.erl
+++ b/lib/diameter/src/base/diameter_peer_fsm.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2010-2015. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2016. 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.
@@ -32,6 +32,9 @@
 -export([start/3,
          result_code/2]).
 
+%% Interface towards diameter.
+-export([find/1]).
+
 %% gen_server callbacks
 -export([init/1,
          handle_call/3,
@@ -185,6 +188,25 @@ start_link(T) ->
                                   infinity,
                                   diameter_lib:spawn_opts(server, [])).
 
+%% find/1
+%%
+%% Identify both pids of a peer_fsm/transport pair.
+
+find(Pid) ->
+    findl([{?MODULE, '_', Pid}, {?MODULE, Pid, '_'}]).
+
+findl([]) ->
+    false;
+
+findl([Pat | Rest]) ->
+    try
+        [{{_, Pid, TPid}, Pid}] = diameter_reg:match(Pat),
+        {Pid, TPid}
+    catch
+        error:_ ->
+            findl(Rest)
+    end.
+
 %% ---------------------------------------------------------------------------
 %% ---------------------------------------------------------------------------
 
@@ -215,6 +237,8 @@ i({Ack, WPid, {M, Ref} = T, Opts, {SvcOpts, Nodes, Dict0, Svc}}) ->
 
     {TPid, Addrs} = start_transport(T, Rest, Svc),
 
+    diameter_reg:add({?MODULE, self(), TPid}),  %% lets pairs be discovered
+
     #state{state = {'Wait-Conn-Ack', Tmo},
            parent = WPid,
            transport = TPid,
-- 
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