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78 lines
2 KiB
Go
78 lines
2 KiB
Go
package viper
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import (
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"fmt"
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jww "github.com/spf13/jwalterweatherman"
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)
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// Logger is a unified interface for various logging use cases and practices, including:
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// - leveled logging
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// - structured logging
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type Logger interface {
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// Trace logs a Trace event.
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//
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// Even more fine-grained information than Debug events.
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// Loggers not supporting this level should fall back to Debug.
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Trace(msg string, keyvals ...interface{})
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// Debug logs a Debug event.
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//
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// A verbose series of information events.
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// They are useful when debugging the system.
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Debug(msg string, keyvals ...interface{})
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// Info logs an Info event.
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//
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// General information about what's happening inside the system.
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Info(msg string, keyvals ...interface{})
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// Warn logs a Warn(ing) event.
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//
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// Non-critical events that should be looked at.
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Warn(msg string, keyvals ...interface{})
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// Error logs an Error event.
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//
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// Critical events that require immediate attention.
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// Loggers commonly provide Fatal and Panic levels above Error level,
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// but exiting and panicing is out of scope for a logging library.
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Error(msg string, keyvals ...interface{})
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}
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type jwwLogger struct{}
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func (jwwLogger) Trace(msg string, keyvals ...interface{}) {
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jww.TRACE.Printf(jwwLogMessage(msg, keyvals...))
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}
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func (jwwLogger) Debug(msg string, keyvals ...interface{}) {
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jww.DEBUG.Printf(jwwLogMessage(msg, keyvals...))
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}
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func (jwwLogger) Info(msg string, keyvals ...interface{}) {
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jww.INFO.Printf(jwwLogMessage(msg, keyvals...))
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}
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func (jwwLogger) Warn(msg string, keyvals ...interface{}) {
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jww.WARN.Printf(jwwLogMessage(msg, keyvals...))
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}
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func (jwwLogger) Error(msg string, keyvals ...interface{}) {
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jww.ERROR.Printf(jwwLogMessage(msg, keyvals...))
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}
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func jwwLogMessage(msg string, keyvals ...interface{}) string {
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out := msg
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if len(keyvals) > 0 && len(keyvals)%2 == 1 {
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keyvals = append(keyvals, nil)
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}
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for i := 0; i <= len(keyvals)-2; i += 2 {
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out = fmt.Sprintf("%s %v=%v", out, keyvals[i], keyvals[i+1])
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}
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return out
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}
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