fix: fix field pool bug

logger.go

@@ -181,13 +181,13 @@ func (l *Log) Logx(ctx context.Context, level Level, msg string, fields ...Field
 	if len(l.fn) == 0 {
 		l.log.Log(level, msg, fields...)
 	} else {
-		tmpFields := fieldPool.Get()
-		defer fieldPool.Put(tmpFields)
+		fc := defaultFieldPool.Get()
+		defer defaultFieldPool.Put(fc)
 		for _, f := range l.fn {
-			tmpFields = append(tmpFields, f(ctx))
+			fc.Fields = append(fc.Fields, f(ctx))
 		}
-		tmpFields = append(tmpFields, fields...)
-		l.log.Log(level, msg, tmpFields...)
+		fc.Fields = append(fc.Fields, fields...)
+		l.log.Log(level, msg, fc.Fields...)
 	}
 }
 

pool.go

@@ -6,26 +6,31 @@ import (
 	"go.uber.org/zap"
 )
 
-var fieldPool = newFieldPool()
+var defaultFieldPool = newFieldPool()
 
-type innerFieldPool struct {
+type fieldContainer struct {
+	Fields []Field
+}
+
+type fieldPool struct {
 	pool sync.Pool
 }
 
-func newFieldPool() *innerFieldPool {
-	return &innerFieldPool{
+func newFieldPool() *fieldPool {
+	return &fieldPool{
 		pool: sync.Pool{
 			New: func() any {
-				return make([]zap.Field, 0, 16)
+				return &fieldContainer{make([]zap.Field, 0, 16)}
 			},
 		},
 	}
 }
 
-func (p *innerFieldPool) Get() []zap.Field {
-	return p.pool.Get().([]zap.Field)
+func (p *fieldPool) Get() *fieldContainer {
+	return p.pool.Get().(*fieldContainer)
 }
 
-func (p *innerFieldPool) Put(fields []zap.Field) {
-	p.pool.Put(fields)
+func (p *fieldPool) Put(c *fieldContainer) {
+	c.Fields = c.Fields[:0]
+	p.pool.Put(c)
 }