plugeth/logger/loggers.go

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/*
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Package logger implements a multi-output leveled logger.
Other packages use tagged logger to send log messages to shared
(process-wide) logging engine. The shared logging engine dispatches to
multiple log systems. The log level can be set separately per log
system.
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Logging is asynchronous and does not block the caller. Message
formatting is performed by the caller goroutine to avoid incorrect
logging of mutable state.
*/
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package logger
import (
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"fmt"
"os"
)
// LogSystem is implemented by log output devices.
// All methods can be called concurrently from multiple goroutines.
type LogSystem interface {
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GetLogLevel() LogLevel
SetLogLevel(i LogLevel)
LogPrint(LogLevel, string)
}
type message struct {
level LogLevel
msg string
}
type LogLevel uint8
const (
// Standard log levels
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Silence LogLevel = iota
ErrorLevel
WarnLevel
InfoLevel
DebugLevel
DebugDetailLevel
)
// A Logger prints messages prefixed by a given tag. It provides named
// Printf and Println style methods for all loglevels. Each ethereum
// component should have its own logger with a unique prefix.
type Logger struct {
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tag string
}
func NewLogger(tag string) *Logger {
return &Logger{"[" + tag + "] "}
}
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func (logger *Logger) sendln(level LogLevel, v ...interface{}) {
logMessageC <- message{level, logger.tag + fmt.Sprintln(v...)}
}
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func (logger *Logger) sendf(level LogLevel, format string, v ...interface{}) {
logMessageC <- message{level, logger.tag + fmt.Sprintf(format, v...)}
}
// Errorln writes a message with ErrorLevel.
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func (logger *Logger) Errorln(v ...interface{}) {
logger.sendln(ErrorLevel, v...)
}
// Warnln writes a message with WarnLevel.
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func (logger *Logger) Warnln(v ...interface{}) {
logger.sendln(WarnLevel, v...)
}
// Infoln writes a message with InfoLevel.
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func (logger *Logger) Infoln(v ...interface{}) {
logger.sendln(InfoLevel, v...)
}
// Debugln writes a message with DebugLevel.
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func (logger *Logger) Debugln(v ...interface{}) {
logger.sendln(DebugLevel, v...)
}
// DebugDetailln writes a message with DebugDetailLevel.
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func (logger *Logger) DebugDetailln(v ...interface{}) {
logger.sendln(DebugDetailLevel, v...)
}
// Errorf writes a message with ErrorLevel.
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func (logger *Logger) Errorf(format string, v ...interface{}) {
logger.sendf(ErrorLevel, format, v...)
}
// Warnf writes a message with WarnLevel.
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func (logger *Logger) Warnf(format string, v ...interface{}) {
logger.sendf(WarnLevel, format, v...)
}
// Infof writes a message with InfoLevel.
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func (logger *Logger) Infof(format string, v ...interface{}) {
logger.sendf(InfoLevel, format, v...)
}
// Debugf writes a message with DebugLevel.
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func (logger *Logger) Debugf(format string, v ...interface{}) {
logger.sendf(DebugLevel, format, v...)
}
// DebugDetailf writes a message with DebugDetailLevel.
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func (logger *Logger) DebugDetailf(format string, v ...interface{}) {
logger.sendf(DebugDetailLevel, format, v...)
}
// Fatalln writes a message with ErrorLevel and exits the program.
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func (logger *Logger) Fatalln(v ...interface{}) {
logger.sendln(ErrorLevel, v...)
Flush()
os.Exit(0)
}
// Fatalf writes a message with ErrorLevel and exits the program.
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func (logger *Logger) Fatalf(format string, v ...interface{}) {
logger.sendf(ErrorLevel, format, v...)
Flush()
os.Exit(0)
}