Update trace/tracestate.go

Co-authored-by: Tyler Yahn <[email protected]>
open-telemetry · Nov 30, 2023 · 7efdc0c · 7efdc0c
1 parent 43a42e4
commit 7efdc0c
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/trace/tracestate.go b/trace/tracestate.go
@@ -237,7 +237,16 @@ func (ts TraceState) String() string {
 	if len(ts.list) == 0 {
 		return ""
 	}
+	var n int
+	n += len(ts.list)     // member delimiters: '='
+	n += len(ts.list) - 1 // list delimiters: ','
+	for _, mem := range ts.list {
+		n += len(mem.Key)
+		n += len(mem.Value)
+	}
+
 	var sb strings.Builder
+	sb.Grow(n)
 	_, _ = sb.WriteString(ts.list[0].Key)
 	_ = sb.WriteByte('=')
 	_, _ = sb.WriteString(ts.list[0].Value)