134 lines
2.6 KiB
Go
134 lines
2.6 KiB
Go
// Package log adds a thin wrapper around logrus to improve non-debug logging
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// performance.
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package log
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import (
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"fmt"
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"io"
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"github.com/sirupsen/logrus"
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)
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var (
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l = logrus.New()
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debug = false
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)
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// SetDebug controls debug logging.
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func SetDebug(to bool) {
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debug = to
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l.Level = logrus.DebugLevel
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}
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// SetFormatter sets the formatter.
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func SetFormatter(to logrus.Formatter) {
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l.Formatter = to
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}
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// SetOutput sets the output.
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func SetOutput(to io.Writer) {
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l.Out = to
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}
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// Fields is a map of logging fields.
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type Fields map[string]interface{}
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// LogFields implements Fielder for Fields.
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func (f Fields) LogFields() Fields {
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return f
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}
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// A Fielder provides Fields via the LogFields method.
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type Fielder interface {
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LogFields() Fields
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}
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// err is a wrapper around an error.
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type err struct {
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e error
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}
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// LogFields provides Fields for logging.
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func (e err) LogFields() Fields {
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return Fields{
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"error": e.e.Error(),
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"type": fmt.Sprintf("%T", e.e),
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}
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}
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// Err is a wrapper around errors that implements Fielder.
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func Err(e error) Fielder {
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return err{e}
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}
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// mergeFielders merges the Fields of multiple Fielders.
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// Fields from the first Fielder will be used unchanged, Fields from subsequent
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// Fielders will be prefixed with "%d.", starting from 1.
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//
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// must be called with len(fielders) > 0
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func mergeFielders(fielders ...Fielder) logrus.Fields {
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if fielders[0] == nil {
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return nil
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}
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fields := fielders[0].LogFields()
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for i := 1; i < len(fielders); i++ {
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if fielders[i] == nil {
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continue
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}
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prefix := fmt.Sprint(i, ".")
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ff := fielders[i].LogFields()
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for k, v := range ff {
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fields[prefix+k] = v
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}
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}
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return logrus.Fields(fields)
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}
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// Debug logs at the debug level if debug logging is enabled.
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func Debug(v interface{}, fielders ...Fielder) {
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if debug {
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if len(fielders) != 0 {
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l.WithFields(mergeFielders(fielders...)).Debug(v)
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} else {
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l.Debug(v)
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}
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}
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}
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// Info logs at the info level.
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func Info(v interface{}, fielders ...Fielder) {
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if len(fielders) != 0 {
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l.WithFields(mergeFielders(fielders...)).Info(v)
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} else {
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l.Info(v)
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}
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}
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// Warn logs at the warning level.
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func Warn(v interface{}, fielders ...Fielder) {
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if len(fielders) != 0 {
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l.WithFields(mergeFielders(fielders...)).Warn(v)
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} else {
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l.Warn(v)
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}
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}
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// Error logs at the error level.
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func Error(v interface{}, fielders ...Fielder) {
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if len(fielders) != 0 {
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l.WithFields(mergeFielders(fielders...)).Error(v)
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} else {
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l.Error(v)
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}
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}
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// Fatal logs at the fatal level and exits with a status code != 0.
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func Fatal(v interface{}, fielders ...Fielder) {
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if len(fielders) != 0 {
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l.WithFields(mergeFielders(fielders...)).Fatal(v)
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} else {
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l.Fatal(v)
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}
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}
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