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package viper
import (
"fmt"
jww "github.com/spf13/jwalterweatherman"
)
// 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 jwwLogger struct{}
func (jwwLogger) Trace(msg string, keyvals ...interface{}) {
jww.TRACE.Printf(jwwLogMessage(msg, keyvals...))
}
func (jwwLogger) Debug(msg string, keyvals ...interface{}) {
jww.DEBUG.Printf(jwwLogMessage(msg, keyvals...))
}
func (jwwLogger) Info(msg string, keyvals ...interface{}) {
jww.INFO.Printf(jwwLogMessage(msg, keyvals...))
}
func (jwwLogger) Warn(msg string, keyvals ...interface{}) {
jww.WARN.Printf(jwwLogMessage(msg, keyvals...))
}
func (jwwLogger) Error(msg string, keyvals ...interface{}) {
jww.ERROR.Printf(jwwLogMessage(msg, keyvals...))
}
func jwwLogMessage(msg string, keyvals ...interface{}) string {
out := msg
if len(keyvals) > 0 && len(keyvals)%2 == 1 {
keyvals = append(keyvals, nil)
}
for i := 0; i <= len(keyvals)-2; i += 2 {
out = fmt.Sprintf("%s %v=%v", out, keyvals[i], keyvals[i+1])
}
return out
}
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