Help us shape the future of Go! Take the 2026 Go Developer Survey

Why Go
- Case Studies
  
  Common problems companies solve with Go
- Use Cases
  
  Stories about how and why companies use Go
- Security
  
  How Go can help keep you secure by default
Learn
Docs
- Effective Go
  
  Tips for writing clear, performant, and idiomatic Go code
- Go User Manual
  
  A complete introduction to building software with Go
- Standard library
  
  Reference documentation for Go's standard library
- Release Notes
  
  Learn what's new in each Go release
- API
  
  Reference documentation for the pkg.go.dev API
Packages
Community
- Recorded Talks
  
  Videos from prior events
- Meetups
  
  Meet other local Go developers
- Conferences
  
  Learn and network with Go developers from around the world
- Go blog
  
  The Go project's official blog.
- Go project
  
  Get help and stay informed from Go
- Get connected

log

package module

Go to main page

Versions in this module

v0

v0.2.1

Apr 27, 2022

v0.2.0

Sep 17, 2021

v0.1.0

Jun 2, 2021

Changes in this version

+ var DefaultCaller = Caller(3)

+ var DefaultTimestamp = TimestampFormat(time.Now, time.RFC3339Nano)

+ var DefaultTimestampUTC = TimestampFormat(func() time.Time { ... }, time.RFC3339Nano)

+ var ErrMissingValue = errors.New("(MISSING)")

+ func NewStdlibAdapter(logger Logger, options ...StdlibAdapterOption) io.Writer

+ func NewSyncWriter(w io.Writer) io.Writer

+ type Logger interface

+ Log func(keyvals ...interface{}) error

+ func NewJSONLogger(w io.Writer) Logger

+ func NewLogfmtLogger(w io.Writer) Logger

+ func NewNopLogger() Logger

+ func NewSyncLogger(logger Logger) Logger

+ func With(logger Logger, keyvals ...interface{}) Logger

+ func WithPrefix(logger Logger, keyvals ...interface{}) Logger

+ func WithSuffix(logger Logger, keyvals ...interface{}) Logger

+ type LoggerFunc func(...interface{}) error

+ func (f LoggerFunc) Log(keyvals ...interface{}) error

+ type StdlibAdapter struct

+ func (a StdlibAdapter) Write(p []byte) (int, error)

+ type StdlibAdapterOption func(*StdlibAdapter)

+ func FileKey(key string) StdlibAdapterOption

+ func MessageKey(key string) StdlibAdapterOption

+ func Prefix(prefix string, joinPrefixToMsg bool) StdlibAdapterOption

+ func TimestampKey(key string) StdlibAdapterOption

+ type StdlibWriter struct

+ func (w StdlibWriter) Write(p []byte) (int, error)

+ type SwapLogger struct

+ func (l *SwapLogger) Log(keyvals ...interface{}) error

+ func (l *SwapLogger) Swap(logger Logger)

+ type Valuer func() interface

+ func Caller(depth int) Valuer

+ func Timestamp(t func() time.Time) Valuer

+ func TimestampFormat(t func() time.Time, layout string) Valuer

v0.0.1-alpha

Apr 6, 2021