引入lumberjack和fluentbit自动分发

EdgeDNS/internal/accesslogs/dns_file_writer.go

@@ -9,7 +9,9 @@ import (
 	"sync"
 
 	"github.com/TeaOSLab/EdgeCommon/pkg/rpc/pb"
+	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
 	"github.com/TeaOSLab/EdgeDNS/internal/remotelogs"
+	"gopkg.in/natefinch/lumberjack.v2"
 )
 
 const (
@@ -30,18 +32,23 @@ func SharedDNSFileWriter() *DNSFileWriter {
 	return sharedDNSFileWriter
 }
 
-// DNSFileWriter 将 DNS 访问日志以 JSON Lines 写入本地文件，供 Fluent Bit 采集.
+// DNSFileWriter 将 DNS 访问日志以 JSON Lines 写入本地文件，供 Fluent Bit 采集。
+// 文件轮转由 lumberjack 内建完成。
 type DNSFileWriter struct {
-	dir    string
-	mu     sync.Mutex
-	file   *os.File
-	inited bool
+	dir          string
+	mu           sync.Mutex
+	file         *lumberjack.Logger
+	rotateConfig *serverconfigs.AccessLogRotateConfig
+	inited       bool
 }
 
 // NewDNSFileWriter 创建 DNS 本地日志写入器.
 func NewDNSFileWriter() *DNSFileWriter {
 	logDir := resolveDefaultDNSLogDir()
-	return &DNSFileWriter{dir: logDir}
+	return &DNSFileWriter{
+		dir:          logDir,
+		rotateConfig: serverconfigs.NewDefaultAccessLogRotateConfig(),
+	}
 }
 
 func resolveDefaultDNSLogDir() string {
@@ -102,6 +109,25 @@ func (w *DNSFileWriter) SetDir(dir string) {
 	w.dir = dir
 }
 
+// SetRotateConfig 更新日志轮转配置并重建 writer。
+func (w *DNSFileWriter) SetRotateConfig(config *serverconfigs.AccessLogRotateConfig) {
+	normalized := config.Normalize()
+
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if equalDNSRotateConfig(w.rotateConfig, normalized) {
+		return
+	}
+
+	if w.file != nil {
+		_ = w.file.Close()
+		w.file = nil
+	}
+	w.inited = false
+	w.rotateConfig = normalized
+}
+
 // EnsureInit 在启动时预创建目录与 access.log.
 func (w *DNSFileWriter) EnsureInit() error {
 	if w.dir == "" {
@@ -127,13 +153,16 @@ func (w *DNSFileWriter) init() error {
 		return err
 	}
 
-	fp, err := os.OpenFile(filepath.Join(w.dir, "access.log"), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
-	if err != nil {
-		remotelogs.Error("DNS_ACCESS_LOG_FILE", "open access.log failed: "+err.Error())
-		return err
+	rotateConfig := w.rotateConfig.Normalize()
+	w.file = &lumberjack.Logger{
+		Filename:   filepath.Join(w.dir, "access.log"),
+		MaxSize:    rotateConfig.MaxSizeMB,
+		MaxBackups: rotateConfig.MaxBackups,
+		MaxAge:     rotateConfig.MaxAgeDays,
+		Compress:   *rotateConfig.Compress,
+		LocalTime:  *rotateConfig.LocalTime,
 	}
 
-	w.file = fp
 	w.inited = true
 	return nil
 }
@@ -148,14 +177,14 @@ func (w *DNSFileWriter) WriteBatch(logs []*pb.NSAccessLog, clusterId int64) {
 	}
 
 	w.mu.Lock()
-	fp := w.file
+	file := w.file
 	w.mu.Unlock()
-	if fp == nil {
+	if file == nil {
 		return
 	}
 
-	for _, log := range logs {
-		ingestLog := FromNSAccessLog(log, clusterId)
+	for _, logItem := range logs {
+		ingestLog := FromNSAccessLog(logItem, clusterId)
 		if ingestLog == nil {
 			continue
 		}
@@ -163,11 +192,11 @@ func (w *DNSFileWriter) WriteBatch(logs []*pb.NSAccessLog, clusterId int64) {
 		if err != nil {
 			continue
 		}
-		_, _ = fp.Write(append(line, '\n'))
+		_, _ = file.Write(append(line, '\n'))
 	}
 }
 
-// Reopen 关闭并重新打开日志文件（配合 logrotate）.
+// Reopen 关闭并重建日志 writer（供兼容调用）.
 func (w *DNSFileWriter) Reopen() error {
 	w.mu.Lock()
 	if w.file != nil {
@@ -197,3 +226,14 @@ func (w *DNSFileWriter) Close() error {
 	}
 	return nil
 }
+
+func equalDNSRotateConfig(left *serverconfigs.AccessLogRotateConfig, right *serverconfigs.AccessLogRotateConfig) bool {
+	if left == nil || right == nil {
+		return left == right
+	}
+	return left.MaxSizeMB == right.MaxSizeMB &&
+		left.MaxBackups == right.MaxBackups &&
+		left.MaxAgeDays == right.MaxAgeDays &&
+		*left.Compress == *right.Compress &&
+		*left.LocalTime == *right.LocalTime
+}