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defaultlogger.go
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206 lines (175 loc) · 5.8 KB
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package log
import (
"fmt"
"io"
"log"
"os"
"sync"
"github.com/oddengine/log/level"
)
const (
// DEFAULT_DEPTH = this frame + wrapper func + caller
DEFAULT_DEPTH = 3
)
var (
std = NewDefaultLogger(os.Stdout, level.TRACE, "CORE", DEFAULT_DEPTH+1)
)
// DefaultLogger encapsulates functionality for providing logging at user-defined levels.
type DefaultLogger struct {
sync.RWMutex
level level.Level
scope string
calldepth int
trace *log.Logger
debug *log.Logger
info *log.Logger
warn *log.Logger
error *log.Logger
}
// Init this class.
func (me *DefaultLogger) Init(n level.Level, scope string, calldepth int) *DefaultLogger {
me.level = n
me.scope = scope
me.calldepth = calldepth
return me
}
// WithTrace is a chainable configuration function which sets the trace-level logger.
func (me *DefaultLogger) WithTrace(logger *log.Logger) *DefaultLogger {
me.level |= level.TRACE
me.trace = logger
return me
}
// WithDebug is a chainable configuration function which sets the debug-level logger.
func (me *DefaultLogger) WithDebug(logger *log.Logger) *DefaultLogger {
me.debug = logger
return me
}
// WithInfo is a chainable configuration function which sets the info-level logger.
func (me *DefaultLogger) WithInfo(logger *log.Logger) *DefaultLogger {
me.info = logger
return me
}
// WithWarn is a chainable configuration function which sets the warn-level logger.
func (me *DefaultLogger) WithWarn(logger *log.Logger) *DefaultLogger {
me.warn = logger
return me
}
// WithError is a chainable configuration function which sets the error-level logger.
func (me *DefaultLogger) WithError(logger *log.Logger) *DefaultLogger {
me.error = logger
return me
}
func (me *DefaultLogger) log(logger *log.Logger, n level.Level, s string) {
me.Lock()
defer me.Unlock()
err := logger.Output(me.calldepth, s)
if err != nil {
Warnf("Failed to log: %s", err)
return
}
if logger.Writer() != me.trace.Writer() && (me.level.Get()&level.TRACE) != 0 {
me.trace.SetPrefix(getPrefix(n, me.scope))
me.trace.Output(me.calldepth, s)
}
}
func (me *DefaultLogger) logf(logger *log.Logger, n level.Level, format string, args ...interface{}) {
s := fmt.Sprintf(format, args...)
me.Lock()
defer me.Unlock()
err := logger.Output(me.calldepth, s)
if err != nil {
Warnf("Failed to log: %s", err)
return
}
if logger.Writer() != me.trace.Writer() && (me.level.Get()&level.TRACE) != 0 {
me.trace.SetPrefix(getPrefix(n, me.scope))
me.trace.Output(me.calldepth, s)
}
}
// Trace emits the preformatted message if the logger is at or below trace-level.
func (me *DefaultLogger) Trace(s string) {
if (me.level.Get() & level.TRACE) != 0 {
me.log(me.trace, level.TRACE, s)
}
}
// Tracef formats and emits a message if the logger is at or below trace-level.
func (me *DefaultLogger) Tracef(format string, args ...interface{}) {
if (me.level.Get() & level.TRACE) != 0 {
me.logf(me.trace, level.TRACE, format, args...)
}
}
// Debug emits the preformatted message if the logger is at or below debug-level.
func (me *DefaultLogger) Debug(n uint32, s string) {
if (me.level.Get() & level.DEBUG) <= level.DEBUG0<<n {
me.log(me.debug, level.DEBUG0<<n, s)
}
}
// Debugf formats and emits a message if the logger is at or below debug-level.
func (me *DefaultLogger) Debugf(n uint32, format string, args ...interface{}) {
if (me.level.Get() & level.DEBUG) <= level.DEBUG0<<n {
me.logf(me.debug, level.DEBUG0<<n, format, args...)
}
}
// Info emits the preformatted message if the logger is at or below info-level.
func (me *DefaultLogger) Info(s string) {
if (me.level.Get() & level.INFO) != 0 {
me.log(me.info, level.INFO, s)
}
}
// Infof formats and emits a message if the logger is at or below info-level.
func (me *DefaultLogger) Infof(format string, args ...interface{}) {
if (me.level.Get() & level.INFO) != 0 {
me.logf(me.info, level.INFO, format, args...)
}
}
// Warn emits the preformatted message if the logger is at or below warn-level.
func (me *DefaultLogger) Warn(s string) {
if (me.level.Get() & level.WARN) != 0 {
me.log(me.warn, level.WARN, s)
}
}
// Warnf formats and emits a message if the logger is at or below warn-level.
func (me *DefaultLogger) Warnf(format string, args ...interface{}) {
if (me.level.Get() & level.WARN) != 0 {
me.logf(me.warn, level.WARN, format, args...)
}
}
// Error emits the preformatted message if the logger is at or below error-level.
func (me *DefaultLogger) Error(s string) {
if (me.level.Get() & level.ERROR) != 0 {
me.log(me.error, level.ERROR, s)
}
}
// Errorf formats and emits a message if the logger is at or below error-level.
func (me *DefaultLogger) Errorf(format string, args ...interface{}) {
if (me.level.Get() & level.ERROR) != 0 {
me.logf(me.error, level.ERROR, format, args...)
}
}
// NewDefaultLogger returns a configured ILogger.
func NewDefaultLogger(out io.Writer, n level.Level, scope string, calldepth int) *DefaultLogger {
return new(DefaultLogger).Init(n, scope, calldepth).
WithTrace(log.New(os.Stdout, getPrefix(level.TRACE, scope), log.LstdFlags|log.Lshortfile)).
WithDebug(log.New(out, getPrefix(level.DEBUG, scope), log.LstdFlags|log.Lshortfile)).
WithInfo(log.New(out, getPrefix(level.INFO, scope), log.LstdFlags|log.Lshortfile)).
WithWarn(log.New(out, getPrefix(level.WARN, scope), log.LstdFlags|log.Lshortfile)).
WithError(log.New(out, getPrefix(level.ERROR, scope), log.LstdFlags|log.Lshortfile))
}
func getPrefix(n level.Level, scope string) string {
if n >= level.ERROR {
return fmt.Sprintf("[ERROR] %s ", scope)
}
if n >= level.WARN {
return fmt.Sprintf("[WARN ] %s ", scope)
}
if n >= level.INFO {
return fmt.Sprintf("[INFO ] %s ", scope)
}
if (n & level.DEBUG) != 0 {
return fmt.Sprintf("[DEBUG] %s ", scope)
}
if (n & level.TRACE) != 0 {
return fmt.Sprintf("[TRACE] %s ", scope)
}
return fmt.Sprintf("%s ", scope)
}