Use separate DNSRequestContext struct for adding DNS context to connections

resolver/rr_context.go

@@ -0,0 +1,39 @@
+package resolver
+
+import (
+	"time"
+
+	"github.com/miekg/dns"
+)
+
+// DNSRequestContext is a static structure to add information to DNS request connections.
+type DNSRequestContext struct {
+	Domain   string
+	Question string
+	RCode    string
+
+	ServedFromCache bool
+	RequestingNew   bool
+	IsBackup        bool
+	Filtered        bool
+
+	Modified time.Time
+	Expires  time.Time
+}
+
+// ToDNSRequestContext returns a new DNSRequestContext of the RRCache.
+func (rrCache *RRCache) ToDNSRequestContext() *DNSRequestContext {
+	return &DNSRequestContext{
+		Domain:   rrCache.Domain,
+		Question: rrCache.Question.String(),
+		RCode:    dns.RcodeToString[rrCache.RCode],
+
+		ServedFromCache: rrCache.ServedFromCache,
+		RequestingNew:   rrCache.RequestingNew,
+		IsBackup:        rrCache.IsBackup,
+		Filtered:        rrCache.Filtered,
+
+		Modified: time.Unix(rrCache.Modified, 0),
+		Expires:  time.Unix(rrCache.Expires, 0),
+	}
+}