V3 is off to a great start!

util/bolt_helpers.go

@@ -1,13 +1,17 @@
 package util
 
 import (
+	"encoding/binary"
 	"fmt"
 	"os"
+	"unicode/utf8"
 
 	bolt "go.etcd.io/bbolt"
 )
 
 func ToJsonString(b *bolt.Bucket) string {
+	// TODO: Escape any double quotes inside
+	// TODO: Deal with empty buckets
 	ret := "{"
 	b.ForEach(func(k, v []byte) error {
 		ret = fmt.Sprintf("%s\"%s\":", ret, string(k))
@@ -44,3 +48,34 @@ func WriteToFile(fn, s string, mode int) error {
 	}
 	return nil
 }
+
+// stringify ensures that we can print only valid characters.
+// It's wrong to assume that everything is a string, since BoltDB is typeless.
+func Stringify(v []byte) string {
+	if utf8.Valid(v) {
+		ok := true
+		for _, r := range string(v) {
+			if r < 0x20 {
+				ok = false
+				break
+			} else if r >= 0x7f && r <= 0x9f {
+				ok = false
+				break
+			}
+		}
+		if ok {
+			return string(v)
+		}
+	}
+	if len(v) == 8 {
+		return fmt.Sprintf("%v", binary.BigEndian.Uint64(v))
+	}
+	return fmt.Sprintf("%x", v)
+}
+
+func StringifyPath(path []string) []string {
+	for k, v := range path {
+		path[k] = Stringify([]byte(v))
+	}
+	return path
+}