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Diffstat (limited to 'lib/snmp/src/app/snmp_app.erl')
| -rw-r--r-- | lib/snmp/src/app/snmp_app.erl | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/lib/snmp/src/app/snmp_app.erl b/lib/snmp/src/app/snmp_app.erl new file mode 100644 index 0000000000..deb42cc373 --- /dev/null +++ b/lib/snmp/src/app/snmp_app.erl @@ -0,0 +1,175 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2003-2009. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% +-module(snmp_app). + +-behaviour(application). + +-include("snmp_debug.hrl"). + + +%%%----------------------------------------------------------------- +%%% This module implements the SNMP application. +%%%----------------------------------------------------------------- +-export([start/2, stop/0, stop/1, config_change/3]). +-export([start_agent/0, start_agent/1, start_agent/2]). +-export([start_manager/0, start_manager/1, start_manager/2]). + +start(Type, []) -> + ?d("start -> entry with" + "~n Type. ~p", [Type]), + %% This is the new snmp application config format + %% First start the (new) central supervisor, + {ok, Pid} = snmp_app_sup:start_link(), + Entities = entities(), + ok = start_entities(Type, Entities), + {ok, Pid}. + +entities() -> + entities([agent, manager], []). + +entities([], []) -> + ?d("entities -> entry when no entities", []), + + %% Could be old style snmp (agent) application config format + %% but could also be a skeleton start, which means that neither + %% agent nor manager config has been specified + + case get_env() of + [] -> + %% Skeleton start + ?d("entities -> skeleton start", []), + []; + OldConf when is_list(OldConf) -> + ?d("entities -> old style config: ~n~p", [OldConf]), + %% Old style snmp (agent) application config format + Conf = snmpa_app:convert_config(OldConf), + ?d("entities -> converted config: ~n~p", [Conf]), + [{agent, Conf}] + end; +entities([], E) -> + ?d("entities -> done", []), + lists:reverse(E); +entities([ET|ETs], E) -> + ?d("entities -> entry with" + "~n ET: ~p", [ET]), + case application:get_env(snmp, ET) of + {ok, Conf} -> + entities(ETs, [{ET, Conf}|E]); + _ -> + entities(ETs, E) + end. + +start_entities(_Type, []) -> + ok; +start_entities(Type, [{agent, Opts}|Entities]) -> + case start_agent(Type, Opts) of + ok -> + start_entities(Type, Entities); + Error -> + Error + end; +start_entities(Type, [{manager, Opts}|Entities]) -> + case start_manager(Type, Opts) of + ok -> + start_entities(Type, Entities); + Error -> + Error + end; +start_entities(Type, [BadEntity|Entities]) -> + error_msg("Bad snmp configuration: ~n: ~p", [BadEntity]), + start_entities(Type, Entities). + + +start_agent() -> + start_agent(normal). + +start_agent(Type) when is_atom(Type) -> + case application:get_env(snmp, agent) of + {ok, Opts} -> + start_agent(Type, Opts); + _ -> + {error, missing_config} + end; +start_agent(Opts) when is_list(Opts) -> + start_agent(normal, Opts); +start_agent(BadArg) -> + {error, {bad_arg, BadArg}}. + +start_agent(Type, Opts) -> + ?d("start_agent -> entry", []), + case snmp_app_sup:start_agent(Type, Opts) of + {ok, _} -> + ok; + Error -> + Error + end. + +start_manager() -> + start_manager(normal). + +start_manager(Type) when is_atom(Type) -> + case application:get_env(snmp, manager) of + {ok, Opts} -> + start_manager(Type, Opts); + _ -> + {error, missing_config} + end; +start_manager(Opts) when is_list(Opts) -> + start_manager(normal, Opts); +start_manager(BadArg) -> + {error, {bad_arg, BadArg}}. + +start_manager(Type, Opts) -> + ?d("start manager -> entry", []), + case snmp_app_sup:start_manager(Type, Opts) of + {ok, _} -> + ok; + Error -> + Error + end. + + +stop(_) -> + ok. + +stop() -> + snmp_app_sup:stop(). + + +get_env() -> + Env = application:get_all_env(snmp), + DeleteElem = [included_applications], + F = fun({Key, _}) -> lists:member(Key, DeleteElem) end, + lists:dropwhile(F, Env). + + +%%----------------------------------------------------------------- +%% The presence of this function means that we will accept changes +%% in the configuration parameters. However, we won't react upon +%% those changes until the app is restarted. So we just return +%% ok. +%%----------------------------------------------------------------- +config_change(_Changed, _New, _Removed) -> + ok. + +%% --------------------------------------------------------------------- + +error_msg(F, A) -> + error_logger:error_msg("~w: " ++ F ++ "~n", [?MODULE|A]). + |