Peer Discovery -> DHT // no more pubsub state

daemons/node/indexer/validator.go

@@ -0,0 +1,61 @@
+package indexer
+
+import (
+	"encoding/json"
+	"errors"
+	"time"
+)
+
+type PeerRecordValidator struct{}
+
+func (v PeerRecordValidator) Validate(key string, value []byte) error {
+
+	var rec PeerRecord
+	if err := json.Unmarshal(value, &rec); err != nil {
+		return errors.New("invalid json")
+	}
+
+	// PeerID must exist
+	if rec.PeerID == "" {
+		return errors.New("missing peerID")
+	}
+
+	// Expiry check
+	if rec.ExpiryDate.Before(time.Now().UTC()) {
+		return errors.New("record expired")
+	}
+
+	// Signature verification
+	rec2 := PeerRecord{
+		Name:   rec.Name,
+		DID:    rec.DID,
+		PubKey: rec.PubKey,
+		PeerID: rec.PeerID,
+	}
+
+	if _, err := rec2.Verify(); err != nil {
+		return errors.New("invalid signature")
+	}
+
+	return nil
+}
+
+func (v PeerRecordValidator) Select(key string, values [][]byte) (int, error) {
+
+	var newest time.Time
+	index := 0
+
+	for i, val := range values {
+		var rec PeerRecord
+		if err := json.Unmarshal(val, &rec); err != nil {
+			continue
+		}
+
+		if rec.ExpiryDate.After(newest) {
+			newest = rec.ExpiryDate
+			index = i
+		}
+	}
+
+	return index, nil
+}