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perf: optimize AsciiJSON.Render method by using fmt.Appendf and reusing temp buffer (#4175)

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per: use bytesconv.BytesToString(ret) instead of string(str)

Co-authored-by: 1911860538 <alxps1911@gmail.com>
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Name 2025-04-21 00:05:34 +08:00 committed by GitHub
parent afa0c31d97
commit 0eb99493c2
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GPG Key ID: B5690EEEBB952194
1 changed files with 7 additions and 4 deletions
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11
render/json.go
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@ -151,7 +151,7 @@ func (r JsonpJSON) WriteContentType(w http.ResponseWriter) {
}
// Render (AsciiJSON) marshals the given interface object and writes it with custom ContentType.
func (r AsciiJSON) Render(w http.ResponseWriter) (err error) {
func (r AsciiJSON) Render(w http.ResponseWriter) error {
r.WriteContentType(w)
ret, err := json.Marshal(r.Data)
if err != nil {
@ -159,12 +159,15 @@ func (r AsciiJSON) Render(w http.ResponseWriter) (err error) {
}
var buffer bytes.Buffer
escapeBuf := make([]byte, 0, 6) // Preallocate 6 bytes for Unicode escape sequences
for _, r := range bytesconv.BytesToString(ret) {
cvt := string(r)
if r >= 128 {
cvt = fmt.Sprintf("\\u%04x", int64(r))
escapeBuf = fmt.Appendf(escapeBuf[:0], "\\u%04x", r) // Reuse escapeBuf
buffer.Write(escapeBuf)
} else {
buffer.WriteByte(byte(r))
}
buffer.WriteString(cvt)
}
_, err = w.Write(buffer.Bytes())