v1.7.0

ADDED:
* logging.Logger objects now are able to return a stdlib *log.Logger.

logging/consts.go

@@ -12,3 +12,16 @@ const (
 	// appendFlags are the flags used for testing the file (and opening/writing).
 	appendFlags int = os.O_APPEND | os.O_CREATE | os.O_WRONLY
 )
+
+const PriorityNone logPrio = 0
+const (
+	PriorityEmergency logPrio = 1 << iota
+	PriorityAlert
+	PriorityCritical
+	PriorityError
+	PriorityWarning
+	PriorityNotice
+	PriorityInformational
+	PriorityDebug
+)
+const PriorityAll logPrio = PriorityEmergency | PriorityAlert | PriorityCritical | PriorityError | PriorityWarning | PriorityNotice | PriorityInformational | PriorityDebug

logging/funcs_file.go

@@ -220,6 +220,14 @@ func (l *FileLogger) Warning(s string, v ...interface{}) (err error) {
 	return
 }
 
+// ToLogger returns a stdlib log.Logger.
+func (l *FileLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&logWriter{backend: l, prio: prio}, "", 0)
+
+	return
+}
+
 // renderWrite prepares/formats a log message to be written to this FileLogger.
 func (l *FileLogger) renderWrite(msg, prio string) {
 

logging/funcs_logprio.go

@@ -0,0 +1,23 @@
+package logging
+
+import (
+	`r00t2.io/goutils/bitmask`
+)
+
+// HasFlag provides a wrapper for functionality to the underlying bitmask.MaskBit.
+func (l *logPrio) HasFlag(prio logPrio) (hasFlag bool) {
+
+	var m *bitmask.MaskBit
+	var p *bitmask.MaskBit
+
+	if l == nil {
+		return
+	}
+
+	m = bitmask.NewMaskBitExplicit(uint(*l))
+	p = bitmask.NewMaskBitExplicit(uint(prio))
+
+	hasFlag = m.HasFlag(*p)
+
+	return
+}

logging/funcs_logwriter.go

@@ -0,0 +1,74 @@
+package logging
+
+import (
+	`r00t2.io/goutils/multierr`
+)
+
+// Write writes bytes b to the underlying Logger's priority level if the logWriter's priority level(s) match.
+func (l *logWriter) Write(b []byte) (n int, err error) {
+
+	var s string
+	var mErr *multierr.MultiError = multierr.NewMultiError(nil)
+
+	if b == nil {
+		return
+	}
+
+	s = string(b)
+
+	if l.prio.HasFlag(PriorityEmergency) {
+		if err = l.backend.Emerg(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityAlert) {
+		if err = l.backend.Alert(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityCritical) {
+		if err = l.backend.Crit(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityError) {
+		if err = l.backend.Err(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityWarning) {
+		if err = l.backend.Warning(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityNotice) {
+		if err = l.backend.Notice(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityInformational) {
+		if err = l.backend.Info(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+	if l.prio.HasFlag(PriorityDebug) {
+		if err = l.backend.Debug(s); err != nil {
+			mErr.AddError(err)
+			err = nil
+		}
+	}
+
+	if !mErr.IsEmpty() {
+		err = mErr
+		return
+	}
+
+	return
+}

logging/funcs_multilogger.go

@@ -3,6 +3,7 @@ package logging
 import (
 	"errors"
 	"fmt"
+	`log`
 	"sync"
 
 	"r00t2.io/goutils/multierr"
@@ -370,3 +371,11 @@ func (m *MultiLogger) Warning(s string, v ...interface{}) (err error) {
 
 	return
 }
+
+// ToLogger returns a stdlib log.Logger.
+func (m *MultiLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&logWriter{backend: m, prio: prio}, "", 0)
+
+	return
+}

logging/funcs_nulllogger.go

@@ -1,5 +1,9 @@
 package logging
 
+import (
+	`log`
+)
+
 // Setup does nothing at all; it's here for interface compat. 🙃
 func (l *NullLogger) Setup() (err error) {
 	return
@@ -72,3 +76,11 @@ func (l *NullLogger) Notice(s string, v ...interface{}) (err error) {
 func (l *NullLogger) Warning(s string, v ...interface{}) (err error) {
 	return
 }
+
+// ToLogger returns a stdlib log.Logger (that doesn't actually write to anything).
+func (l *NullLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&nullWriter{}, "", 0)
+
+	return
+}

logging/funcs_nullwriter.go

@@ -0,0 +1,12 @@
+package logging
+
+// nulLWriter writes... nothing. To avoid errors, however, in downstream code it pretends it does (n will *always* == len(b)).
+func (nw *nullWriter) Write(b []byte) (n int, err error) {
+
+	if b == nil {
+		return
+	}
+	n = len(b)
+
+	return
+}

logging/funcs_std.go

@@ -244,3 +244,11 @@ func (l *StdLogger) renderWrite(msg, prio string) {
 
 	return
 }
+
+// ToLogger returns a stdlib log.Logger.
+func (l *StdLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&logWriter{backend: l, prio: prio}, "", 0)
+
+	return
+}

logging/funcs_sysd_linux.go

@@ -223,3 +223,11 @@ func (l *SystemDLogger) renderWrite(msg string, prio journal.Priority) {
 
 	return
 }
+
+// ToLogger returns a stdlib log.Logger.
+func (l *SystemDLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&logWriter{backend: l, prio: prio}, "", 0)
+
+	return
+}

logging/funcs_syslog_linux.go

@@ -266,3 +266,11 @@ func (l *SyslogLogger) Warning(s string, v ...interface{}) (err error) {
 
 	return
 }
+
+// ToLogger returns a stdlib log.Logger.
+func (l *SyslogLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&logWriter{backend: l, prio: prio}, "", 0)
+
+	return
+}

logging/funcs_winlogger_windows.go

@@ -3,6 +3,7 @@ package logging
 import (
 	"errors"
 	"fmt"
+	`log`
 	"os"
 	"os/exec"
 	"syscall"
@@ -342,3 +343,11 @@ func (l *WinLogger) Warning(s string, v ...interface{}) (err error) {
 	return
 
 }
+
+// ToLogger returns a stdlib log.Logger.
+func (l *WinLogger) ToLogger(prio logPrio) (stdLibLog *log.Logger) {
+
+	stdLibLog = log.New(&logWriter{backend: l, prio: prio}, "", 0)
+
+	return
+}

logging/types.go

@@ -3,8 +3,12 @@ package logging
 import (
 	"log"
 	"os"
+
+	`r00t2.io/goutils/bitmask`
 )
 
+type logPrio bitmask.MaskBit
+
 /*
 Logger is one of the various loggers offered by this module.
 */
@@ -23,6 +27,7 @@ type Logger interface {
 	GetPrefix() (p string, err error)
 	Setup() (err error)
 	Shutdown() (err error)
+	ToLogger(prio logPrio) (stdLibLog *log.Logger)
 }
 
 /*
@@ -105,3 +110,12 @@ type MultiLogger struct {
 	*/
 	Loggers map[string]Logger
 }
+
+// logWriter is used as a log.Logger and is returned by <Logger>.ToLogger.
+type logWriter struct {
+	backend Logger
+	prio    logPrio
+}
+
+// nullWriter is used as a shortcut by NullLogger.ToLogger.
+type nullWriter struct{}