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logger.go
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logger.go
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package viper
// Logger is a unified interface for various logging use cases and practices, including:
// - leveled logging
// - structured logging
type Logger interface {
// Trace logs a Trace event.
//
// Even more fine-grained information than Debug events.
// Loggers not supporting this level should fall back to Debug.
Trace(msg string, keyvals ...interface{})
// Debug logs a Debug event.
//
// A verbose series of information events.
// They are useful when debugging the system.
Debug(msg string, keyvals ...interface{})
// Info logs an Info event.
//
// General information about what's happening inside the system.
Info(msg string, keyvals ...interface{})
// Warn logs a Warn(ing) event.
//
// Non-critical events that should be looked at.
Warn(msg string, keyvals ...interface{})
// Error logs an Error event.
//
// Critical events that require immediate attention.
// Loggers commonly provide Fatal and Panic levels above Error level,
// but exiting and panicing is out of scope for a logging library.
Error(msg string, keyvals ...interface{})
}
type discardLogger struct{}
var _ Logger = (*discardLogger)(nil)
func (discardLogger) Trace(string, ...interface{}) {}
func (discardLogger) Debug(string, ...interface{}) {}
func (discardLogger) Info(string, ...interface{}) {}
func (discardLogger) Warn(string, ...interface{}) {}
func (discardLogger) Error(string, ...interface{}) {}