Merge branch 'ia/ssl/max-sessions/OTP-12392' into maint

* ia/ssl/max-sessions/OTP-12392:
  ssl: Fix documentation mistakes
  ssl: Add upper limit for session cache
  ssl: Measure elapsed time with erlang:monotonic_time

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/ssl/src/ssl_session.erl b/lib/ssl/src/ssl_session.erl
index 1849a05314..2b24bff5ff 100644
--- a/lib/ssl/src/ssl_session.erl
+++ b/lib/ssl/src/ssl_session.erl
@@ -61,13 +61,16 @@ client_id(ClientInfo, Cache, CacheCb, OwnCert) ->
 	    SessionId
     end.
 
--spec valid_session(#session{}, seconds()) -> boolean().
+-spec valid_session(#session{}, seconds() | {invalidate_before, integer()}) -> boolean().
 %%
 %% Description: Check that the session has not expired
 %%--------------------------------------------------------------------
+valid_session(#session{time_stamp = TimeStamp}, {invalidate_before, Before}) ->
+    TimeStamp > Before;
 valid_session(#session{time_stamp = TimeStamp}, LifeTime) ->
-    Now =  calendar:datetime_to_gregorian_seconds({date(), time()}),
-    Now - TimeStamp < LifeTime.
+    Now = erlang:monotonic_time(),
+    Lived = erlang:convert_time_unit(Now-TimeStamp, native, seconds),
+    Lived < LifeTime.
 
 server_id(Port, <<>>, _SslOpts, _Cert, _, _) ->
     {ssl_manager:new_session_id(Port), undefined};