perf: apply initial buffer size for bytes.Buffer

Author: marjune163

src/serverHandler/log.go

@@ -5,28 +5,24 @@ import (
 	"net/http"
 )
 
+const LOG_BUF_SIZE = 80
+
 func (h *handler) logRequest(r *http.Request) {
 	if !h.logger.CanLogAccess() {
 		return
 	}
 
-	buffer := &bytes.Buffer{}
-
-	buffer.WriteString(r.RemoteAddr)
-	buffer.WriteByte(' ')
-	buffer.WriteString(r.Method)
-	buffer.WriteByte(' ')
-	buffer.WriteString(r.RequestURI)
+	payload := []byte(r.RemoteAddr + " " + r.Method + " " + r.RequestURI)
 
-	h.logger.LogAccess(buffer.Bytes())
+	h.logger.LogAccess(payload)
 }
 
 func (h *handler) logUpload(filename, fsPath string, r *http.Request) {
 	if !h.logger.CanLogAccess() {
 		return
 	}
 
-	buffer := &bytes.Buffer{}
+	buffer := bytes.NewBuffer(make([]byte, 0, LOG_BUF_SIZE))
 
 	buffer.WriteString(r.RemoteAddr)
 	buffer.WriteByte(' ')
@@ -43,7 +39,7 @@ func (h *handler) logArchive(filename, relPath string, r *http.Request) {
 		return
 	}
 
-	buffer := &bytes.Buffer{}
+	buffer := bytes.NewBuffer(make([]byte, 0, LOG_BUF_SIZE))
 
 	buffer.WriteString(r.RemoteAddr)
 	buffer.WriteByte(' ')

src/serverLog/logMan.go

@@ -9,6 +9,8 @@ import (
 	"time"
 )
 
+const LOG_BUF_SIZE = 80
+
 type logMan struct {
 	filename string
 	file     *os.File
@@ -19,7 +21,7 @@ type logMan struct {
 }
 
 func getLogEntry(payload []byte) []byte {
-	buffer := &bytes.Buffer{}
+	buffer := bytes.NewBuffer(make([]byte, 0, LOG_BUF_SIZE))
 	buffer.WriteString(util.FormatTimeSecond(time.Now()))
 	buffer.WriteByte(' ')
 	buffer.Write(payload)

src/util/compareNumInStr.go

@@ -23,15 +23,15 @@ func findCommonPrefix(prev, next string) int {
 }
 
 func extractPrefixDigits(input string) (output string) {
-	buf := bytes.Buffer{}
+	buffer := bytes.NewBuffer(make([]byte, 0, 8))
 	for i, length := 0, len(input); i < length; i++ {
 		b := input[i]
 		if b < '0' || b > '9' {
 			break
 		}
-		buf.WriteByte(b)
+		buffer.WriteByte(b)
 	}
-	return buf.String()
+	return buffer.String()
 }
 
 func CompareNumInStr(prev, next string) bool {