1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
% ============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
]).
%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
to_string(Value) when is_binary(Value) -> binary_to_list(Value);
to_string(Value) -> Value.
concat(List) ->
lists:flatten(lists:map(fun to_string/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_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 = os:getenv("HOSTNAME"),
ConsulHost = os:getenv("CONSUL_HOST"),
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 os:getenv("CDAP_CLUSTER_TO_MANAGE") 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:uuid1()).
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) -> 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]).
|
