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ns_config_log.erl
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ns_config_log.erl
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%% @author Couchbase <info@couchbase.com>
%% @copyright 2009-2018 Couchbase, Inc.
%%
%% 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.
%%
-module(ns_config_log).
-behaviour(gen_server).
-export([start_link/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3, sanitize/1]).
-include("ns_common.hrl").
-record(state, {buckets=[]}).
%% state sanitization
-export([format_status/2]).
format_status(_Opt, [_PDict, State]) ->
sanitize(State).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
Self = self(),
ns_pubsub:subscribe_link(ns_config_events,
fun (KVList) when is_list(KVList) ->
Self ! {config_change, KVList};
(_) ->
ok
end),
{ok, #state{}}.
terminate(_Reason, _State) -> ok.
code_change(_OldVsn, State, _) -> {ok, State}.
% Don't log values for some password/auth-related config values.
handle_call(Request, From, State) ->
?log_warning("Unexpected handle_call(~p, ~p, ~p)", [Request, From, State]),
{reply, ok, State, hibernate}.
handle_cast(Request, State) ->
?log_warning("Unexpected handle_cast(~p, ~p)", [Request, State]),
{noreply, State, hibernate}.
handle_info({config_change, KVList}, State) ->
NewState =
lists:foldl(
fun (KV, Acc) ->
log_kv(KV, Acc)
end, State, KVList),
{noreply, NewState, hibernate};
handle_info(Info, State) ->
?log_warning("Unexpected handle_info(~p, ~p)", [Info, State]),
{noreply, State, hibernate}.
%% Internal functions
compute_buckets_diff(NewBuckets, OldBuckets) ->
OldConfigs = proplists:get_value(configs, OldBuckets, []),
NewConfigs = proplists:get_value(configs, NewBuckets, []),
Diffed =
merge_bucket_configs(
fun (NewValue, OldValue) ->
OldMap = proplists:get_value(map, OldValue, []),
NewMap = proplists:get_value(map, NewValue, []),
MapDiff = misc:compute_map_diff(NewMap, OldMap),
OldFFMap = proplists:get_value(fastForwardMap, OldValue, []),
NewFFMap = proplists:get_value(fastForwardMap, NewValue, []),
FFMapDiff = misc:compute_map_diff(NewFFMap, OldFFMap),
misc:update_proplist(
NewValue,
[{map, MapDiff},
{fastForwardMap, FFMapDiff}])
end, NewConfigs, OldConfigs),
misc:update_proplist(NewBuckets, [{configs, Diffed}]).
rewrite_tuples_with_vclock(Fun, Config) ->
misc:rewrite_tuples(
fun ({Key, [{'_vclock', _} = VClock|Value]}) ->
case Fun({Key, Value}) of
continue ->
continue;
{stop, {Key, NewValue}} ->
{stop, {Key, [VClock|NewValue]}}
end;
(Other) ->
Fun(Other)
end, Config).
sanitize(Config) ->
rewrite_tuples_with_vclock(
fun ({password, _}) ->
{stop, {password, "*****"}};
({sasl_password, _}) ->
{stop, {sasl_password, "*****"}};
({admin_pass, _}) ->
{stop, {admin_pass, "*****"}};
({pass, _}) ->
{stop, {pass, "*****"}};
({cert_and_pkey, {Cert, _PKey}}) ->
{stop, {cert_and_pkey, {Cert, <<"*****">>}}};
({cert_and_pkey, {Props, Cert, _PKey}}) ->
{stop, {cert_and_pkey, {Props, Cert, <<"*****">>}}};
({{metakv, K}, {?METAKV_SENSITIVE, _V}}) ->
{stop, {{metakv, K}, {?METAKV_SENSITIVE, <<"*****">>}}};
({cookie, Cookie}) ->
{stop, {cookie, ns_cookie_manager:sanitize_cookie(Cookie)}};
(_Other) ->
continue
end, Config).
log_kv({buckets, RawBuckets0}, #state{buckets=OldBuckets} = State) ->
VClock = ns_config:extract_vclock(RawBuckets0),
RawBuckets = ns_config:strip_metadata(RawBuckets0),
NewBuckets = sort_buckets(RawBuckets),
BucketsDiff = compute_buckets_diff(NewBuckets, OldBuckets),
NewState = State#state{buckets=NewBuckets},
log_common(buckets, [VClock | BucketsDiff]),
NewState;
log_kv({K, V}, State) ->
log_common(K, V),
State.
log_common(K, V) ->
%% These can get pretty big, so pre-format them for the logger.
{_, VS} = sanitize({K, V}),
VB = list_to_binary(io_lib:print(VS, 0, 80, 100)),
?log_debug("config change:~n~p ->~n~s", [K, VB]).
sort_buckets(Buckets) ->
Configs = proplists:get_value(configs, Buckets, []),
SortedConfigs = lists:keysort(1, Configs),
misc:update_proplist(Buckets, [{configs, SortedConfigs}]).
%% Merge bucket configs using a function. Note that only those buckets that
%% are present in the first list will be present in the resulting list.
merge_bucket_configs(_Fun, [], _) ->
[];
merge_bucket_configs(Fun, [X | Xs], []) ->
{_, XValue} = X,
[Fun(XValue, []) | merge_bucket_configs(Fun, Xs, [])];
merge_bucket_configs(Fun, [X | XRest] = Xs, [Y | YRest] = Ys) ->
{XName, XValue} = X,
{YName, YValue} = Y,
if
XName < YName ->
[{XName, Fun(XValue, [])} | merge_bucket_configs(Fun, XRest, Ys)];
XName > YName ->
merge_bucket_configs(Fun, Xs, YRest);
true ->
[{XName, Fun(XValue, YValue)} | merge_bucket_configs(Fun, XRest, YRest)]
end.