Pull request: all: make stats disableable, imp code

Updates #2141.

Squashed commit of the following:

commit d8f3bcd9927b00a1d4b8b60b43144bc4b4469311
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Jun 17 19:10:53 2021 +0300

    stats: imp docs, names

commit 97eae3c2da5585467ca024bdacdbf922bcc8b444
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Jun 17 18:51:49 2021 +0300

    all: make stats disableable, imp code

CHANGELOG.md

@@ -15,9 +15,12 @@ and this project adheres to
 
 ### Added
 
+- Completely disabling statistics by setting the statistics interval to zero
+  ([#2141]).
 - The ability to completely purge DHCP leases ([#1691]).
-- The ability to set the timeout for querying the upstream servers ([#2280]).
-- The ability to change group and user ID on startup on Unix ([#2763]).
+- Settable timeouts for querying the upstream servers ([#2280]).
+- Configuration file parameters to change group and user ID on startup on Unix
+  ([#2763]).
 - Experimental OpenBSD support for AMD64 and 64-bit ARM CPUs ([#2439]).
 - Support for custom port in DNS-over-HTTPS profiles for Apple's devices
   ([#3172]).
@@ -67,6 +70,7 @@ released by then.
 
 [#1381]: https://github.com/AdguardTeam/AdGuardHome/issues/1381
 [#1691]: https://github.com/AdguardTeam/AdGuardHome/issues/1691
+[#2141]: https://github.com/AdguardTeam/AdGuardHome/issues/2141
 [#2280]: https://github.com/AdguardTeam/AdGuardHome/issues/2280
 [#2439]: https://github.com/AdguardTeam/AdGuardHome/issues/2439
 [#2441]: https://github.com/AdguardTeam/AdGuardHome/issues/2441

client/src/components/Settings/StatsConfig/Form.js

@@ -8,22 +8,27 @@ import { renderRadioField, toNumber } from '../../../helpers/form';
 import { FORM_NAME, STATS_INTERVALS_DAYS } from '../../../helpers/constants';
 import '../FormButton.css';
 
-const getIntervalFields = (processing, t, toNumber) => STATS_INTERVALS_DAYS.map((interval) => {
-    const title = interval === 1 ? t('interval_24_hour') : t('interval_days', { count: interval });
+const getIntervalTitle = (interval, t) => {
+    switch (interval) {
+        case 0:
+            return t('disabled');
+        case 1:
+            return t('interval_24_hour');
+        default:
+            return t('interval_days', { count: interval });
+    }
+};
 
-    return (
-        <Field
+const getIntervalFields = (processing, t, toNumber) => STATS_INTERVALS_DAYS.map((interval) => <Field
     key={interval}
     name="interval"
     type="radio"
     component={renderRadioField}
     value={interval}
-            placeholder={title}
+    placeholder={getIntervalTitle(interval, t)}
     normalize={toNumber}
     disabled={processing}
-        />
-    );
-});
+/>);
 
 const Form = (props) => {
     const {

client/src/helpers/constants.js

@@ -355,7 +355,7 @@ export const ENCRYPTION_SOURCE = {
 export const FILTERED = 'Filtered';
 export const NOT_FILTERED = 'NotFiltered';
 
-export const STATS_INTERVALS_DAYS = [1, 7, 30, 90];
+export const STATS_INTERVALS_DAYS = [0, 1, 7, 30, 90];
 
 export const QUERY_LOG_INTERVALS_DAYS = [1, 7, 30, 90];
 

internal/stats/http.go

@@ -19,6 +19,10 @@ func httpError(r *http.Request, w http.ResponseWriter, code int, format string,
 	http.Error(w, text, code)
 }
 
+// topAddrs is an alias for the types of the TopFoo fields of statsResponse.
+// The key is either a client's address or a requested address.
+type topAddrs = map[string]uint64
+
 // statsResponse is a response for getting statistics.
 type statsResponse struct {
 	TimeUnits string `json:"time_units"`
@@ -31,9 +35,9 @@ type statsResponse struct {
 
 	AvgProcessingTime float64 `json:"avg_processing_time"`
 
-	TopQueried []map[string]uint64 `json:"top_queried_domains"`
-	TopClients []map[string]uint64 `json:"top_clients"`
-	TopBlocked []map[string]uint64 `json:"top_blocked_domains"`
+	TopQueried []topAddrs `json:"top_queried_domains"`
+	TopClients []topAddrs `json:"top_clients"`
+	TopBlocked []topAddrs `json:"top_blocked_domains"`
 
 	DNSQueries []uint64 `json:"dns_queries"`
 
@@ -45,17 +49,37 @@ type statsResponse struct {
 // handleStats is a handler for getting statistics.
 func (s *statsCtx) handleStats(w http.ResponseWriter, r *http.Request) {
 	start := time.Now()
-	response, ok := s.getData()
-	log.Debug("Stats: prepared data in %v", time.Since(start))
+
+	var resp statsResponse
+	if s.conf.limit == 0 {
+		resp = statsResponse{
+			TimeUnits: "days",
+
+			TopBlocked: []topAddrs{},
+			TopClients: []topAddrs{},
+			TopQueried: []topAddrs{},
+
+			BlockedFiltering:     []uint64{},
+			DNSQueries:           []uint64{},
+			ReplacedParental:     []uint64{},
+			ReplacedSafebrowsing: []uint64{},
+		}
+	} else {
+		var ok bool
+		resp, ok = s.getData()
+
+		log.Debug("stats: prepared data in %v", time.Since(start))
 
 		if !ok {
 			httpError(r, w, http.StatusInternalServerError, "Couldn't get statistics data")
 
 			return
 		}
+	}
 
 	w.Header().Set("Content-Type", "application/json")
-	err := json.NewEncoder(w).Encode(response)
+
+	err := json.NewEncoder(w).Encode(resp)
 	if err != nil {
 		httpError(r, w, http.StatusInternalServerError, "json encode: %s", err)
 

internal/stats/unit.go

@@ -147,7 +147,7 @@ func (s *statsCtx) Start() {
 }
 
 func checkInterval(days uint32) bool {
-	return days == 1 || days == 7 || days == 30 || days == 90
+	return days == 0 || days == 1 || days == 7 || days == 30 || days == 90
 }
 
 func (s *statsCtx) dbOpen() bool {
@@ -251,7 +251,7 @@ func (s *statsCtx) periodicFlush() {
 		}
 
 		id := s.conf.UnitID()
-		if ptr.id == id {
+		if ptr.id == id || s.conf.limit == 0 {
 			time.Sleep(time.Second)
 
 			continue
@@ -412,9 +412,11 @@ func convertTopSlice(a []countPair) []map[string]uint64 {
 }
 
 func (s *statsCtx) setLimit(limitDays int) {
-	conf := *s.conf
-	conf.limit = uint32(limitDays) * 24
-	s.conf = &conf
+	s.conf.limit = uint32(limitDays) * 24
+	if limitDays == 0 {
+		s.clear()
+	}
+
 	log.Debug("stats: set limit: %d", limitDays)
 }
 
@@ -488,6 +490,10 @@ func (s *statsCtx) getClientIP(ip net.IP) (clientIP net.IP) {
 }
 
 func (s *statsCtx) Update(e Entry) {
+	if s.conf.limit == 0 {
+		return
+	}
+
 	if e.Result == 0 ||
 		e.Result >= rLast ||
 		e.Domain == "" ||
@@ -695,6 +701,10 @@ func (s *statsCtx) getData() (statsResponse, bool) {
 }
 
 func (s *statsCtx) GetTopClientsIP(maxCount uint) []net.IP {
+	if s.conf.limit == 0 {
+		return nil
+	}
+
 	units, _ := s.loadUnits(s.conf.limit)
 	if units == nil {
 		return nil

openapi/CHANGELOG.md

@@ -4,6 +4,11 @@
 
 ## v0.107: API changes
 
+###  Disabling Statistics
+
+* The API `POST /control/stats_config` HTTP API allows disabling statistics by
+  setting `"interval"` to `0`.
+
 ### `POST /control/dhcp/reset_leases`
 
 * The new `POST /control/dhcp/reset_leases` HTTP API allows removing all leases

openapi/openapi.yaml

@@ -1630,8 +1630,16 @@
       'description': 'Statistics configuration'
       'properties':
         'interval':
+          'description': >
+            Time period to keep the data.  `0` means that the statistics is
+            disabled.
+          'enum':
+          - 0
+          - 1
+          - 7
+          - 30
+          - 90
           'type': 'integer'
-          'description': 'Time period to keep data (1 | 7 | 30 | 90)'
     'DhcpConfig':
       'type': 'object'
       'properties':