Add DNS Stats widget

internal/feed/adguard.go

@@ -0,0 +1,99 @@
+package feed
+
+import (
+	"net/http"
+	"strings"
+)
+
+type adguardStatsResponse struct {
+	TotalQueries      int              `json:"num_dns_queries"`
+	QueriesSeries     []int            `json:"dns_queries"`
+	BlockedQueries    int              `json:"num_blocked_filtering"`
+	BlockedSeries     []int            `json:"blocked_filtering"`
+	ResponseTime      float64          `json:"avg_processing_time"`
+	TopBlockedDomains []map[string]int `json:"top_blocked_domains"`
+}
+
+func FetchAdguardStats(instanceURL, username, password string) (*DNSStats, error) {
+	requestURL := strings.TrimRight(instanceURL, "/") + "/control/stats"
+
+	request, err := http.NewRequest("GET", requestURL, nil)
+
+	if err != nil {
+		return nil, err
+	}
+
+	request.SetBasicAuth(username, password)
+
+	responseJson, err := decodeJsonFromRequest[adguardStatsResponse](defaultClient, request)
+
+	if err != nil {
+		return nil, err
+	}
+
+	stats := &DNSStats{
+		TotalQueries:   responseJson.TotalQueries,
+		BlockedQueries: responseJson.BlockedQueries,
+		ResponseTime:   int(responseJson.ResponseTime * 1000),
+	}
+
+	if stats.TotalQueries <= 0 {
+		return stats, nil
+	}
+
+	stats.BlockedPercent = int(float64(responseJson.BlockedQueries) / float64(responseJson.TotalQueries) * 100)
+
+	var topBlockedDomainsCount = min(len(responseJson.TopBlockedDomains), 5)
+
+	for i := 0; i < topBlockedDomainsCount; i++ {
+		domain := responseJson.TopBlockedDomains[i]
+		var firstDomain string
+
+		for k := range domain {
+			firstDomain = k
+			break
+		}
+
+		if firstDomain == "" {
+			continue
+		}
+
+		stats.TopBlockedDomains = append(stats.TopBlockedDomains, DNSStatsBlockedDomain{
+			Domain:         firstDomain,
+			PercentBlocked: int(float64(domain[firstDomain]) / float64(responseJson.BlockedQueries) * 100),
+		})
+	}
+
+	// Adguard _should_ return data for the last 24 hours in a 1 hour interval
+	if len(responseJson.QueriesSeries) != 24 || len(responseJson.BlockedSeries) != 24 {
+		return stats, nil
+	}
+
+	maxQueriesInSeries := 0
+
+	for i := 0; i < 8; i++ {
+		queries := 0
+		blocked := 0
+
+		for j := 0; j < 3; j++ {
+			queries += responseJson.QueriesSeries[i*3+j]
+			blocked += responseJson.BlockedSeries[i*3+j]
+		}
+
+		stats.Series[i] = DNSStatsSeries{
+			Queries:        queries,
+			Blocked:        blocked,
+			PercentBlocked: int(float64(blocked) / float64(queries) * 100),
+		}
+
+		if queries > maxQueriesInSeries {
+			maxQueriesInSeries = queries
+		}
+	}
+
+	for i := 0; i < 8; i++ {
+		stats.Series[i].PercentTotal = int(float64(stats.Series[i].Queries) / float64(maxQueriesInSeries) * 100)
+	}
+
+	return stats, nil
+}