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Approvals:
  laforge: Looks good to me, approved
  pespin: Looks good to me, but someone else must approve
  Jenkins Builder: Verified

pfcp_peer: add fetch_info/0

This is useful for introspection and the upcoming REST interface.

Change-Id: I3fdcf7f6daac09a8c523826995a610c04f5a327b
---
M src/pfcp_peer.erl
1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/pfcp_peer.erl b/src/pfcp_peer.erl
index efcf0d0..f6e9c7d 100644
--- a/src/pfcp_peer.erl
+++ b/src/pfcp_peer.erl
@@ -48,6 +48,7 @@
          session_establish_req/3,
          session_modify_req/3,
          session_delete_req/1,
+         fetch_info/0,
          shutdown/0]).
 
 -include_lib("kernel/include/logger.hrl").
@@ -69,7 +70,14 @@
 -type pfcp_msg() :: {pfcp_msg_type(), pfcp_ies()}.
 -type pfcp_pdu() :: #pfcp{}.
 
--export_type([pfcp_session_rsp/0,
+-type peer_info() :: #{state := atom(),
+                       laddr := inet:ip_address(),
+                       raddr := inet:ip_address(),
+                       lrts := pos_integer(),
+                       rrts => pos_integer()}.
+
+-export_type([peer_info/0,
+              pfcp_session_rsp/0,
               pfcp_msg_type/0,
               pfcp_seq_nr/0,
               pfcp_seid/0,
@@ -139,6 +147,11 @@
     gen_statem:call(?MODULE, {?FUNCTION_NAME, SEID}).
 
 
+-spec fetch_info() -> peer_info().
+fetch_info() ->
+    gen_statem:call(?MODULE, ?FUNCTION_NAME).
+
+
 shutdown() ->
     gen_statem:stop(?MODULE).
 
@@ -338,6 +351,18 @@
     S1 = registry_del({Pid, Ref}, S0),
     {keep_state, S1};
 
+handle_event(State,
+             {call, From}, fetch_info,
+             #peer_state{} = S) ->
+    Info = #{state => State,
+             laddr => S#peer_state.loc_addr,
+             raddr => S#peer_state.rem_addr,
+             lrts => S#peer_state.loc_rts,
+             rrts => S#peer_state.rem_rts},
+    %% omit props with Value =:= undefined
+    Reply = maps:filter(fun(_K, V) -> V =/= undefined end, Info),
+    {keep_state_and_data, {reply, From, Reply}};
+
 handle_event(State, Event, EventData, S) ->
     ?LOG_ERROR("Unexpected event ~p in state ~p: ~p", [Event, State, EventData]),
     {keep_state, S}.

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