binary encoding and some changes to nson benchmarks.

binary/binary.go

@@ -0,0 +1,76 @@
+package binary
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/nbd-wtf/go-nostr"
+)
+
+func UnmarshalBinary(data []byte, evt *Event) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("failed to decode leaner: %v", r)
+		}
+	}()
+
+	copy(evt.ID[:], data[0:32])
+	copy(evt.PubKey[:], data[32:64])
+	copy(evt.Sig[:], data[64:128])
+	evt.CreatedAt = nostr.Timestamp(binary.BigEndian.Uint32(data[128:132]))
+	evt.Kind = binary.BigEndian.Uint16(data[132:134])
+	contentLength := int(binary.BigEndian.Uint16(data[134:136]))
+	evt.Content = string(data[136 : 136+contentLength])
+
+	curr := 136 + contentLength
+	ntags := int(data[curr])
+	evt.Tags = make(nostr.Tags, ntags)
+
+	for t := range evt.Tags {
+		curr = curr + 1
+		nItems := int(data[curr])
+		tag := make(nostr.Tag, nItems)
+		for i := range tag {
+			curr = curr + 1
+			itemSize := int(binary.BigEndian.Uint16(data[curr : curr+2]))
+			itemStart := curr + 2
+			itemEnd := itemStart + itemSize
+			item := string(data[itemStart:itemEnd])
+			tag[i] = item
+			curr = itemEnd
+		}
+		evt.Tags[t] = tag
+	}
+
+	return err
+}
+
+func MarshalBinary(evt *Event) []byte {
+	content := []byte(evt.Content)
+	buf := make([]byte, 32+32+64+4+2+2+len(content)+65536 /* blergh */)
+	copy(buf[0:32], evt.ID[:])
+	copy(buf[32:64], evt.PubKey[:])
+	copy(buf[64:128], evt.Sig[:])
+	binary.BigEndian.PutUint32(buf[128:132], uint32(evt.CreatedAt))
+	binary.BigEndian.PutUint16(buf[132:134], evt.Kind)
+	binary.BigEndian.PutUint16(buf[134:136], uint16(len(content)))
+	copy(buf[136:], content)
+
+	curr := 136 + len(content)
+	buf[curr] = uint8(len(evt.Tags))
+	for _, tag := range evt.Tags {
+		curr++
+		buf[curr] = uint8(len(tag))
+		for _, item := range tag {
+			curr++
+			itemb := []byte(item)
+			itemSize := len(itemb)
+			binary.BigEndian.PutUint16(buf[curr:curr+2], uint16(itemSize))
+			itemEnd := curr + 2 + itemSize
+			copy(buf[curr+2:itemEnd], itemb)
+			curr = itemEnd
+		}
+	}
+	buf = buf[0 : curr+1]
+	return buf
+}