refactor: use strings.Builder to improve performance

Signed-off-by: zjumathcode <pai314159@2980.com>

modules/caddyhttp/reverseproxy/fastcgi/client_test.go

@@ -244,15 +244,15 @@ func DisabledTest(t *testing.T) {
 	sendFcgi(0, fcgiParams, []byte("c4ca4238a0b923820dcc509a6f75849b=1&7b8b965ad4bca0e41ab51de7b31363a1=n"), nil, nil)
 
 	log.Println("test:", "post data (more than 60KB)")
-	data := ""
+	var data strings.Builder
 	for i := 0x00; i < 0xff; i++ {
 		v0 := strings.Repeat(fmt.Sprint(i), 256)
 		h := md5.New()
 		_, _ = io.WriteString(h, v0)
 		k0 := fmt.Sprintf("%x", h.Sum(nil))
-		data += k0 + "=" + url.QueryEscape(v0) + "&"
+		data.WriteString(k0 + "=" + url.QueryEscape(v0) + "&")
 	}
-	sendFcgi(0, fcgiParams, []byte(data), nil, nil)
+	sendFcgi(0, fcgiParams, []byte(data.String()), nil, nil)
 
 	log.Println("test:", "post form (use url.Values)")
 	p0 := make(map[string]string, 1)

modules/caddyhttp/routes.go

@@ -18,6 +18,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strings"
 
 	"github.com/caddyserver/caddy/v2"
 )
@@ -110,14 +111,15 @@ func (r Route) Empty() bool {
 }
 
 func (r Route) String() string {
-	handlersRaw := "["
+	var handlersRaw strings.Builder
+	handlersRaw.WriteString("[")
 	for _, hr := range r.HandlersRaw {
-		handlersRaw += " " + string(hr)
+		handlersRaw.WriteString(" " + string(hr))
 	}
-	handlersRaw += "]"
+	handlersRaw.WriteString("]")
 
 	return fmt.Sprintf(`{Group:"%s" MatcherSetsRaw:%s HandlersRaw:%s Terminal:%t}`,
-		r.Group, r.MatcherSetsRaw, handlersRaw, r.Terminal)
+		r.Group, r.MatcherSetsRaw, handlersRaw.String(), r.Terminal)
 }
 
 // Provision sets up both the matchers and handlers in the route.
@@ -440,13 +442,14 @@ func (ms *MatcherSets) FromInterface(matcherSets any) error {
 
 // TODO: Is this used?
 func (ms MatcherSets) String() string {
-	result := "["
+	var result strings.Builder
+	result.WriteString("[")
 	for _, matcherSet := range ms {
 		for _, matcher := range matcherSet {
-			result += fmt.Sprintf(" %#v", matcher)
+			result.WriteString(fmt.Sprintf(" %#v", matcher))
 		}
 	}
-	return result + " ]"
+	return result.String() + " ]"
 }
 
 var routeGroupCtxKey = caddy.CtxKey("route_group")

modules/logging/filters.go

@@ -255,7 +255,7 @@ func (m IPMaskFilter) Filter(in zapcore.Field) zapcore.Field {
 }
 
 func (m IPMaskFilter) mask(s string) string {
-	output := ""
+	var output strings.Builder
 	for value := range strings.SplitSeq(s, ",") {
 		value = strings.TrimSpace(value)
 		host, port, err := net.SplitHostPort(value)
@@ -264,7 +264,7 @@ func (m IPMaskFilter) mask(s string) string {
 		}
 		ipAddr := net.ParseIP(host)
 		if ipAddr == nil {
-			output += value + ", "
+			output.WriteString(value + ", ")
 			continue
 		}
 		mask := m.v4Mask
@@ -273,13 +273,13 @@ func (m IPMaskFilter) mask(s string) string {
 		}
 		masked := ipAddr.Mask(mask)
 		if port == "" {
-			output += masked.String() + ", "
+			output.WriteString(masked.String() + ", ")
 			continue
 		}
 
-		output += net.JoinHostPort(masked.String(), port) + ", "
+		output.WriteString(net.JoinHostPort(masked.String(), port) + ", ")
 	}
-	return strings.TrimSuffix(output, ", ")
+	return strings.TrimSuffix(output.String(), ", ")
 }
 
 type filterAction string