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% ============LICENSE_START=======================================================
% org.onap.dcae
% ================================================================================
% Copyright (c) 2017 AT&T Intellectual Property. 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.
% You may obtain a copy of the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS,
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
% See the License for the specific language governing permissions and
% limitations under the License.
% ============LICENSE_END=========================================================
%
% ECOMP is a trademark and service mark of AT&T Intellectual Property.
-module(util).
-include("application.hrl").
-export([concat/1,
get_platform_envs_and_config/0,
resolve_cbs/2,
initialize_database/0,
get_all_appnames_from_db/0,
get_my_version/0,
get_programs_for_pfapp_from_db/1,
gen_uuid/0,
iso/0,
iso_elapsed/2,
to_str/1,
ip_to_str/1,
update_with_new_config_map/2,
ejson_to_map/1,
get_envs/0
]).
%http://stackoverflow.com/questions/39757020/erlang-drying-up-stringbinary-concatenation
%NOTE! Does not work or bomb when an element in the list is an atom. Must be a string or binary. Maybe add a check for this
concat(List) -> lists:flatten(lists:map(fun to_str/1, List)).
resolve_cbs(XER, ConsulURL) ->
%Ideally this function would dissapear if we get real DNS. This essentially is doing an SRV record lookup every time someone needs the bindng URL
%This allows the broker to handle the case where the CBS moves IP or Ports
%New as of 6/28/17: Uses the hardcoded short name for the CBS
{IP, Port} = consul_interface:consul_get_service_ip_port(XER, "config_binding_service", ConsulURL),
concat(["http://", IP, ":", integer_to_binary(Port)]).
get_envs() ->
%breaking this out for mock testing of get_platform_envs_and_config()
{os:getenv("HOSTNAME"), os:getenv("CONSUL_HOST"), os:getenv("CDAP_CLUSTER_TO_MANAGE")}.
get_platform_envs_and_config() ->
%Get platform envs needed for broker operation, then fetch my config.
%If something critical fails, returns [], else [ConsulURL, CDAPUrl, BoundConfigMap]
{MyName, ConsulHost, CDAPEnvName} = ?MODULE:get_envs(),
case MyName == false orelse ConsulHost == false of
true -> [];
false ->
%build Consul URL
ConsulURL = concat(["http://", ConsulHost, ":8500"]),
%Bind my own config map
%generate my own XER here
XER = gen_uuid(),
{200, BoundConfig} = consul_interface:consul_bind_config(XER, MyName, ConsulURL),
BoundConfigMap = jiffy:decode(jiffy:encode(BoundConfig), [return_maps]), %kind of an interesting way to turn an erlang proplist into a map
%Here, we waterfall looking for "CDAP_CLUSTER_TO_MANAGE".
%First, we will check for environmnental variables for a cluster *NAME*
%If that is not found, then we will check out bound config for a fully bound URL
%If that is also not found, let it crash baby.
CDAPURL = case CDAPEnvName of
false ->
list_to_binary(concat(["http://", lists:nth(1, maps:get(<<"cdap_cluster_to_manage">>, BoundConfigMap))])); %cbs returns ip:port. need http:// or will get "no adaptors found" error
CDAPName ->
{IP, Port} = consul_interface:consul_get_service_ip_port(XER, CDAPName, ConsulURL),
list_to_binary(concat(["http://", IP, ":", integer_to_binary(Port)]))
end,
[MyName, ConsulURL, CDAPURL, BoundConfigMap]
end.
initialize_database() ->
%Create the database (currently MNesia) if it does not exist, and the application table.
%Or, do nothing.
N = node(),
lager:info(io_lib:format("Initializing database. My node name is ~s", [N])),
%set MNesia dir
application:set_env(mnesia, dir, "/var/mnesia/"),
%stop if running, can't create schema if it is. Dont check status, OK if stopped
mnesia:stop(),
%create the schema if it does not already exist. Dont check status, ok if exists
%erlang:display(mnesia:delete_schema([N])),
mnesia:create_schema([N]),
%start MNesia, assert it works
ok = mnesia:start(), %start MNesia, bomb if alreay started, should not happen
lager:info("Mnesia started"),
%try to create the table, or if it exists, do nothing
%erlang:display(mnesia:delete_table(application)),
case mnesia:create_table(application, [{attributes, record_info(fields, application)}, {disc_copies, [N]}]) of
{aborted,{already_exists,application}} ->
lager:info("Application table already exists");
{atomic,ok} ->
lager:info(io_lib:format("Created application table on ~s", [N]))
end,
%try to create the app supplementaty table, or if it exists, do nothing
%erlang:display(mnesia:delete_table(application)),
case mnesia:create_table(prog_flow_supp, [{attributes, record_info(fields, prog_flow_supp)}, {disc_copies, [N]}]) of
{aborted,{already_exists, prog_flow_supp}} ->
lager:info("prog_flow_supp table already exists");
{atomic,ok} ->
lager:info(io_lib:format("Created prog_flow_supp table on ~s", [N]))
end,
%wait up to 30s for the table to come up. Usually instantaneous. If it takes more crash abd burn
ok = mnesia:wait_for_tables([application, prog_flow_supp], 30000),
ok.
get_all_appnames_from_db() ->
{atomic, Apps} = mnesia:transaction(fun() -> mnesia:match_object(application, #application{_ = '_'}, read) end),
lists:map(fun(X) -> {application, Appname,_,_,_,_,_,_,_,_} = X,
Appname
end, Apps).
-spec get_programs_for_pfapp_from_db(binary()) -> lprogram().
get_programs_for_pfapp_from_db(Appname) ->
{atomic, [#prog_flow_supp{appname = Appname, programs=Programs}]} = mnesia:transaction(fun() -> mnesia:match_object(prog_flow_supp, #prog_flow_supp{appname = Appname, _ = '_'}, read) end),
Programs.
get_my_version() ->
%stolen from the SO post I asked about: http://stackoverflow.com/questions/43147530/erlang-programmatically-get-application-version/43152182#43152182
case lists:keyfind(cdapbroker, 1, application:loaded_applications()) of
{_, _, Ver} -> list_to_binary(Ver);
false -> <<"error">>
end.
gen_uuid() ->
%generate an RFC compliant v1 uuid using lib
uuid:to_string(uuid:uuid4()).
iso() ->
%generate 8601 ts
iso8601:format(erlang:timestamp()).
iso_elapsed(Endtime, Starttime) ->
%%%...subtract two isos and return the number of seconds elapsed between Starttime and Endtime
Edt = iso8601:parse(Endtime),
Sdt = iso8601:parse(Starttime),
Egs = calendar:datetime_to_gregorian_seconds(Edt),
Sgs = calendar:datetime_to_gregorian_seconds(Sdt),
Egs - Sgs.
to_str("") -> "";
to_str(Term) when is_list(Term) -> Term;
to_str(Term) when is_binary(Term) -> binary_to_list(Term);
to_str(Term) ->
lists:flatten(io_lib:format("~p", [Term])).
-spec ip_to_str({inet:ip_address(), inet:port_number()}) -> binary().
%nasty.. I miss pythons x <= Foo <= Y syntax.. or something mathematical like Foo in [X..Y].. erlang not good 4 math
ip_to_str({{A,B,C,D}, Port}) when A >= 0 andalso A =< 255 andalso B >= 0 andalso B =< 255 andalso C >= 0 andalso C =< 255 andalso D >= 0 andalso D =< 255 andalso port >= 0 andalso Port =<65535 ->
concat([to_str(A),".",to_str(B),".", to_str(C),".",to_str(D),":",to_str(Port)]);
ip_to_str({_,_}) -> invalid.
update_with_new_config_map(NewConfig, OldConfig) ->
%helper for smart_reconfigure, broken out so we can unit test it.
%
%Takes in a new config, some keys in which may be shared with OldConfig, and returns a new map with the same keys as OldConfig, except values that had overlap were replaced by NewConfig
%if no keys in NewConfig overlap with OldConfig, returns the atom 'nooverlap'
%
%This is very similar to the maps:merge/2 builtin but that will inject keys of newconfig that were not in oldconfig. We need a "RIGHT JOIN"
NCKeys = maps:keys(NewConfig),
ConfigOverlaps = [X || X <- NCKeys, maps:is_key(X, OldConfig)],
case ConfigOverlaps of
[] -> nooverlap;
_ ->
%we have an entry that should be in app config
%build a new map with just the keys to update
Pred = fun(X,_) -> lists:member(X, ConfigOverlaps) end,
NewVals = maps:filter(Pred, NewConfig),
maps:merge(OldConfig, NewVals)
end.
ejson_to_map(E) ->
%takes the jiffy "ejson: format of {[{<<"foo">>, <<"bar">>}, {<<"foo2">>, <<"bar2">>}]} and turns it into a map,
%usefu because ejsons do not appear to be order-independent-comparable, but maps are (e.g., two maps are equal if all their k+v are equal but agnostic to order)
jiffy:decode(jiffy:encode(E), [return_maps]).
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