145 lines
2.7 KiB
Go
145 lines
2.7 KiB
Go
package log
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import (
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"context"
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"fmt"
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"io"
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"os"
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"github.com/sirupsen/logrus"
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)
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type contextKey int
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const (
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loggerKey contextKey = iota
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)
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// Logger the Traefik logger.
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type Logger interface {
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logrus.FieldLogger
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WriterLevel(logrus.Level) *io.PipeWriter
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}
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var (
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mainLogger Logger
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logFilePath string
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logFile *os.File
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)
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func init() {
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mainLogger = logrus.StandardLogger()
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logrus.SetOutput(os.Stdout)
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}
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// SetLogger sets the logger.
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func SetLogger(l Logger) {
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mainLogger = l
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}
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// SetOutput sets the standard logger output.
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func SetOutput(out io.Writer) {
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logrus.SetOutput(out)
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}
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// SetFormatter sets the standard logger formatter.
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func SetFormatter(formatter logrus.Formatter) {
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logrus.SetFormatter(formatter)
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}
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// SetLevel sets the standard logger level.
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func SetLevel(level logrus.Level) {
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logrus.SetLevel(level)
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}
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// GetLevel returns the standard logger level.
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func GetLevel() logrus.Level {
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return logrus.GetLevel()
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}
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// Str adds a string field.
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func Str(key, value string) func(logrus.Fields) {
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return func(fields logrus.Fields) {
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fields[key] = value
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}
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}
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// With Adds fields.
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func With(ctx context.Context, opts ...func(logrus.Fields)) context.Context {
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logger := FromContext(ctx)
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fields := make(logrus.Fields)
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for _, opt := range opts {
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opt(fields)
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}
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logger = logger.WithFields(fields)
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return context.WithValue(ctx, loggerKey, logger)
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}
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// FromContext Gets the logger from context.
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func FromContext(ctx context.Context) Logger {
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if ctx == nil {
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panic("nil context")
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}
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logger, ok := ctx.Value(loggerKey).(Logger)
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if !ok {
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logger = mainLogger
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}
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return logger
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}
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// WithoutContext Gets the main logger.
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func WithoutContext() Logger {
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return mainLogger
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}
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// OpenFile opens the log file using the specified path.
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func OpenFile(path string) error {
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logFilePath = path
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var err error
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logFile, err = os.OpenFile(logFilePath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o666)
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if err != nil {
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return err
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}
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SetOutput(logFile)
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return nil
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}
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// CloseFile closes the log and sets the Output to stdout.
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func CloseFile() error {
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logrus.SetOutput(os.Stdout)
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if logFile != nil {
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return logFile.Close()
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}
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return nil
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}
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// RotateFile closes and reopens the log file to allow for rotation by an external source.
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// If the log isn't backed by a file then it does nothing.
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func RotateFile() error {
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logger := FromContext(context.Background())
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if logFile == nil && logFilePath == "" {
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logger.Debug("Traefik log is not writing to a file, ignoring rotate request")
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return nil
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}
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if logFile != nil {
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defer func(f *os.File) {
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_ = f.Close()
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}(logFile)
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}
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if err := OpenFile(logFilePath); err != nil {
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return fmt.Errorf("error opening log file: %w", err)
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}
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return nil
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}
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