Support rabbit.connection_max in Cuttlefish schema

Author: michaelklishin

priv/schema/rabbit.schema

@@ -523,10 +523,29 @@ end}.
 %% Set the max permissible number of channels per connection.
 %% 0 means "no limit".
 %%
-%% {channel_max, 128},
+%% {channel_max, 0},
 
 {mapping, "channel_max", "rabbit.channel_max", [{datatype, integer}]}.
 
+%% Set the max permissible number of client connections per node.
+%% `infinity` means "no limit".
+%%
+%% {connection_max, infinity},
+
+{mapping, "connection_max", "rabbit.connection_max",
+  [{datatype, [{atom, infinity}, integer]}]}.
+
+{translation, "rabbit.connection_max",
+ fun(Conf) ->
+  case cuttlefish:conf_get("connection_max", Conf, undefined) of
+      undefined -> cuttlefish:unset();
+      infinity  -> infinity;
+      Val when is_integer(Val) -> Val;
+      _         -> cuttlefish:invalid("should be a non-negative integer")
+  end
+ end
+}.
+
 %% Customising Socket Options.
 %%
 %% See (http://www.erlang.org/doc/man/inet.html#setopts-2) for

test/config_schema_SUITE_data/rabbit.snippets

@@ -151,6 +151,18 @@ tcp_listen_options.exit_on_close = false",
   [{rabbit,
        [{vm_memory_calculation_strategy, legacy}]}],
   []},
+ {connection_max,
+  "connection_max = 999",
+  [{rabbit,[{connection_max, 999}]}],
+  []},
+ {connection_max,
+  "connection_max = infinity",
+  [{rabbit,[{connection_max, infinity}]}],
+  []},
+ {channel_max,
+  "channel_max = 16",
+  [{rabbit,[{channel_max, 16}]}],
+  []},
  {listeners_tcp_ip,
   "listeners.tcp.1 = 192.168.1.99:5672",
   [{rabbit,[{tcp_listeners,[{"192.168.1.99",5672}]}]}],