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log.go
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log.go
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package panurge
import (
"github.com/aws/aws-xray-sdk-go/xray"
"github.com/sirupsen/logrus"
)
// Logger creates a new logger for structured logging.
func Logger(rawLogLevel string) *logrus.Logger {
logger := logrus.New()
logger.SetFormatter(&logrus.JSONFormatter{})
logger.SetLevel(logrus.WarnLevel)
logger.Hooks.Add(&AnnotationHook{})
if rawLogLevel != "" {
logLevel, err := logrus.ParseLevel(rawLogLevel)
if err != nil {
logger.WithError(err).WithField(
"raw_log_level", rawLogLevel,
).Error("invalid log level")
} else {
logger.SetLevel(logLevel)
}
}
return logger
}
type AnnotationHook struct{}
func (h *AnnotationHook) Levels() []logrus.Level {
return logrus.AllLevels
}
func (h *AnnotationHook) Fire(e *logrus.Entry) error {
ann := GetContextAnnotations(e.Context)
if ann == nil {
return nil
}
e.Data["trace_id"] = ann.GetID()
e.Data["user"] = ann.GetUser()
e.Data["annotations"] = ann.GetAnnotations()
// Only log metadata if something is going wrong
if e.Level <= logrus.WarnLevel {
e.Data["metadata"] = ann.GetMetadata()
}
seg := xray.GetSegment(e.Context)
if seg == nil {
return nil
}
e.Data["segment"] = seg.Name
return nil
}