Finalizing for 1.2.0

.gitignore

@@ -31,6 +31,7 @@
 # But DO include the actual tests.
 !_test.go
 !*_test.go
+!*_test_*.go
 !*_test/
 
 # Output of the go coverage tool, specifically when used with LiteIDE

logging/TODO

@@ -1,10 +1,11 @@
 - Implement code line/func/etc. (only for debug?):
   https://stackoverflow.com/a/24809646
   https://golang.org/pkg/runtime/#Caller
+  -- log.LlongFile and log.Lshortfile flags don't currently work properly for StdLogger/FileLogger; they refer to the file in logging package rather than the caller.
 
 - Suport remote loggers? (eventlog, syslog, systemd)
 
+- JSON logger? YAML logger? XML logger?
+
 - DOCS.
 -- Done, but flesh out.
-
-- Unit/Integration tests.

logging/consts_test.go

@@ -0,0 +1,39 @@
+package logging
+
+import (
+	`log`
+)
+
+/*
+	The following are strings written to the Logger in the various tests.
+	The %v is populated with the name of the type of Logger.
+*/
+const (
+	testAlert   string = "This is a test ALERT-priority log message for logger %v."
+	testCrit    string = "This is a test CRITICAL-priority (CRIT) log message for logger %v."
+	testDebug   string = "This is a test DEBUG-priority log message for logger %v."
+	testEmerg   string = "This is a test EMERGENCY-priority (EMERG) log message for logger %v."
+	testErr     string = "This is a test ERROR-priority (ERR) log message for logger %v."
+	testInfo    string = "This is a test INFO-priority log message for logger %v."
+	testNotice  string = "This is a test NOTICE-priority log message for logger %v."
+	testWarning string = "This is a test WARNING-priority log message for logger %v."
+)
+
+// Prefixes to use for tests.
+const (
+	// TestLogPrefix is used as the initial prefix.
+	TestLogPrefix string = "LOGGING_TESTRUN"
+	// TestLogAltPrefix is used as the alternative prefix to Logger.SetPrefix.
+	TestLogAltPrefix string = "LOGGING_TESTRUN_ALT"
+)
+
+const (
+	// EnvVarKeepLog is the env var key/var name to use to suppress removal of FileLogger.Path after tests complete.
+	EnvVarKeepLog string = "LOGGING_KEEP_TEMPLOG"
+)
+
+const (
+	// logFlags are used to set the log flags for StdLogger (and FileLogger.StdLogger).
+	// logFlags int = log.Ldate | log.Lmicroseconds | log.Llongfile | log.LUTC
+	logFlags int = log.Ldate | log.Lmicroseconds | log.Lshortfile | log.LUTC
+)

logging/consts_windows.go

@@ -55,7 +55,7 @@ var DefaultEventID *WinEventID = &WinEventID{
 	Warning: EventWarning,
 }
 
-// Default Event IDs for WinEventID.
+// Default Event IDs for WinEventID (DefaultEventID, specifically).
 const (
 	EventAlert uint32 = 1 << iota
 	EventCrit

logging/doc.go

@@ -35,11 +35,11 @@ Note that in the case of a MultiLogger, err (if not nil) will be a (r00t2.io/gou
 
 logging.Logger types also have the following methods:
 
-	DoDebug(d bool)
+	DoDebug(d bool) (err error)
-	SetPrefix(p string)
+	SetPrefix(p string) (err error)
-	GetPrefix() (p string)
+	GetPrefix() (p string, err error)
-	Setup()
+	Setup() (err error)
-	Shutdown()
+	Shutdown() (err error)
 
 In some cases, Logger.Setup and Logger.Shutdown are no-ops. In other cases, they perform necessary initialization/cleanup and closing of the logger.
 It is recommended to *always* run Setup and Shutdown before and after using, respectively, regardless of the actual logging.Logger type.

logging/errs_windows.go

@@ -6,7 +6,10 @@ import (
 )
 
 var (
+	// ErrBadBinPath is returned if installing a binary-registered Event Log source instead of using EventCreate.exe.
 	ErrBadBinPath error = errors.New("evaluated binary path does not actually exist")
-	ErrBadPerms   error = errors.New("access denied when attempting to register Event Log source")
+	// ErrBadPerms is returned if an access denied error is received when attempting to register, write to, close, etc. a source without proper perms.
-	ErrBadEid     error = errors.New(fmt.Sprintf("event IDs must be between %v and %v inclusive", EIDMin, EIDMax))
+	ErrBadPerms error = errors.New("access denied when attempting to register Event Log source")
+	// ErrBadEid is returned if an event ID is within an invalid range.
+	ErrBadEid error = errors.New(fmt.Sprintf("event IDs must be between %v and %v inclusive", EIDMin, EIDMax))
 )

logging/funcs.go

@@ -6,13 +6,16 @@ import (
 
 // testOpen attempts to open a file for writing to test for suitability as a LogFile path.
 func testOpen(path string) (success bool, err error) {
+
 	var f *os.File
 
 	// Example #2, https://golang.org/pkg/os/#OpenFile
 	if f, err = os.OpenFile(path, appendFlags, logPerm); err != nil {
 		return
 	}
-	defer f.Close()
+	if err = f.Close(); err != nil {
+		return
+	}
 
 	success = true
 

logging/funcs_file.go

@@ -3,7 +3,6 @@ package logging
 import (
 	`errors`
 	"fmt"
-	"io"
 	`io/fs`
 	"log"
 	"os"
@@ -13,8 +12,6 @@ import (
 // Setup sets up/configures a FileLogger and prepares it for use.
 func (l *FileLogger) Setup() (err error) {
 
-	var multi io.Writer
-
 	// This uses a shared handle across the import. We don't want that.
 	// l.Logger = log.Default()
 	if l.Prefix != "" {
@@ -25,19 +22,7 @@ func (l *FileLogger) Setup() (err error) {
 		return
 	}
 
-	// https://stackoverflow.com/a/36719588/733214
+	l.Logger = log.New(l.writer, l.Prefix, l.LogFlags)
-	switch {
-	case l.EnableStdErr && l.EnableStdOut:
-		multi = io.MultiWriter(os.Stdout, os.Stderr, l.writer)
-	case l.EnableStdErr:
-		multi = io.MultiWriter(os.Stderr, l.writer)
-	case l.EnableStdOut:
-		multi = io.MultiWriter(os.Stdout, l.writer)
-	default:
-		multi = l.writer
-	}
-
-	l.Logger = log.New(multi, l.Prefix, l.LogFlags)
 	// l.Logger.SetOutput(multi)
 
 	return
@@ -50,6 +35,8 @@ func (l *FileLogger) Shutdown() (err error) {
 		if !errors.Is(err, fs.ErrClosed) {
 			return
 		}
+		err = nil
+		return err
 	}
 
 	return

logging/funcs_linux_test.go

@@ -0,0 +1,270 @@
+package logging
+
+import (
+	`fmt`
+	`os`
+	`testing`
+)
+
+/*
+	TestSysDLogger tests functionality for SystemDLogger.
+*/
+func TestSysDLogger(t *testing.T) {
+
+	var l *SystemDLogger
+	var ltype string = "SystemDLogger"
+	var prefix string
+	var err error
+
+	l = &SystemDLogger{
+		EnableDebug: true,
+		Prefix:      TestLogPrefix,
+	}
+
+	if err = l.Setup(); err != nil {
+		t.Fatalf("error when running Setup: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if prefix != TestLogPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else if l.EnableDebug {
+		t.Fatalf("did not properly set Debug filter state")
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}
+
+/*
+	TestSyslogLogger tests functionality for SyslogLogger.
+*/
+func TestSyslogLogger(t *testing.T) {
+
+	var l *SyslogLogger
+	var ltype string = "SyslogLogger"
+	var prefix string
+	var err error
+
+	l = &SyslogLogger{
+		EnableDebug: true,
+		Prefix:      TestLogPrefix,
+	}
+
+	if err = l.Setup(); err != nil {
+		t.Fatalf("error when running Setup: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if prefix != TestLogPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else if l.EnableDebug {
+		t.Fatalf("did not properly set Debug filter state")
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}
+
+// TestDefaultLogger tests GetLogger.
+func TestDefaultLogger(t *testing.T) {
+
+	var l Logger
+	var tempfile *os.File
+	var tempfilePath string
+	var keepLog bool
+	var ltype string
+	var prefix string
+	var testPrefix string
+	var err error
+
+	if tempfile, err = os.CreateTemp("", ".LOGGINGTEST_*"); err != nil {
+		t.Fatalf("error when creating temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+	tempfilePath = tempfile.Name()
+	// We can close the handler immediately; we don't need it since the FileLogger opens its own.
+	if err = tempfile.Close(); err != nil {
+		t.Fatalf("error when closing handler for temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+
+	if l, err = GetLogger(true, TestLogPrefix, logFlags, tempfilePath); err != nil {
+		t.Fatalf("error when spawning default Linux logger via GetLogger: %v", err.Error())
+	}
+
+	ltype = fmt.Sprintf("%T", l)
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if ltype == "StdLogger" || ltype == "FileLogger" { // StdLogger (and thus FileLogger) adds a space at the end.
+		testPrefix = TestLogPrefix + " "
+	} else {
+		testPrefix = TestLogPrefix
+	}
+
+	if prefix != testPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	_, keepLog = os.LookupEnv(EnvVarKeepLog)
+
+	if !keepLog {
+		if err = os.Remove(tempfilePath); err != nil {
+			t.Fatalf("error when removing temporary log file '%v': %v", tempfilePath, err.Error())
+		}
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}

logging/funcs_multilogger.go

@@ -1,6 +1,8 @@
 package logging
 
 import (
+	`errors`
+	`fmt`
 	`sync`
 
 	`r00t2.io/goutils/multierr`
@@ -12,16 +14,17 @@ func (m *MultiLogger) Setup() (err error) {
 	var wg sync.WaitGroup
 	var errs *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func() {
+		go func(logger Logger, lName string) {
 			var err2 error
 			defer wg.Done()
-			if err2 = l.Setup(); err2 != nil {
+			if err2 = logger.Setup(); err2 != nil {
+				errs.AddError(errors.New(fmt.Sprintf("error on Setup for logger %v; follows (may be out of order):", lName)))
 				errs.AddError(err2)
 				err2 = nil
 			}
-		}()
+		}(l, logName)
 	}
 
 	wg.Wait()
@@ -40,16 +43,17 @@ func (m *MultiLogger) Shutdown() (err error) {
 	var wg sync.WaitGroup
 	var errs *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func() {
+		go func(logger Logger, lName string) {
 			var err2 error
 			defer wg.Done()
-			if err2 = l.Shutdown(); err2 != nil {
+			if err2 = logger.Shutdown(); err2 != nil {
+				errs.AddError(errors.New(fmt.Sprintf("error on Shutdown for logger %v; follows (may be out of order):", lName)))
 				errs.AddError(err2)
 				err2 = nil
 			}
-		}()
+		}(l, logName)
 	}
 
 	wg.Wait()
@@ -87,16 +91,17 @@ func (m *MultiLogger) DoDebug(d bool) (err error) {
 
 	m.EnableDebug = d
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func() {
+		go func(logger Logger, lName string) {
 			var err2 error
 			defer wg.Done()
 			if err2 = l.DoDebug(d); err2 != nil {
+				errs.AddError(errors.New(fmt.Sprintf("error on DoDebug for logger %v; follows (may be out of order):", lName)))
 				errs.AddError(err2)
 				err2 = nil
 			}
-		}()
+		}(l, logName)
 	}
 
 	wg.Wait()
@@ -121,16 +126,17 @@ func (m *MultiLogger) SetPrefix(prefix string) (err error) {
 
 	m.Prefix = prefix
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func() {
+		go func(logger Logger, lName string) {
 			var err2 error
 			defer wg.Done()
 			if err2 = l.SetPrefix(prefix); err != nil {
+				errs.AddError(errors.New(fmt.Sprintf("error on SetPrefix for logger %v; follows (may be out of order):", lName)))
 				errs.AddError(err2)
 				err2 = nil
 			}
-		}()
+		}(l, logName)
 	}
 
 	wg.Wait()
@@ -149,15 +155,16 @@ func (m *MultiLogger) Alert(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Alert(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Alert for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -175,15 +182,16 @@ func (m *MultiLogger) Crit(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Crit(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Crit for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -201,15 +209,16 @@ func (m *MultiLogger) Debug(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Debug(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Debug for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -226,15 +235,16 @@ func (m *MultiLogger) Emerg(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Emerg(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Emerg for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -251,15 +261,16 @@ func (m *MultiLogger) Err(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Err(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Err for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -277,15 +288,16 @@ func (m *MultiLogger) Info(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Info(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Info for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -303,15 +315,16 @@ func (m *MultiLogger) Notice(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Notice(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Notice for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()
@@ -329,15 +342,16 @@ func (m *MultiLogger) Warning(s string, v ...interface{}) (err error) {
 	var wg sync.WaitGroup
 	var e *multierr.MultiError = multierr.NewMultiError(nil)
 
-	for _, l := range m.Loggers {
+	for logName, l := range m.Loggers {
 		wg.Add(1)
-		go func(logObj Logger, msg string, rplc ...interface{}) {
+		go func(logObj Logger, msg, lName string, rplc ...interface{}) {
 			defer wg.Done()
 			if err = logObj.Warning(msg, rplc...); err != nil {
+				e.AddError(errors.New(fmt.Sprintf("error on Warning for logger %v; follows (may be out of order):", lName)))
 				e.AddError(err)
 				err = nil
 			}
-		}(l, s, v...)
+		}(l, s, logName, v...)
 	}
 
 	wg.Wait()

logging/funcs_multilogger_mgr.go

@@ -37,9 +37,15 @@ func GetMultiLogger(enableDebug bool, prefix string) (m *MultiLogger) {
 	identifier is a string to use to identify the added StdLogger in MultiLogger.Loggers.
 	If empty, one will be automatically generated.
 
+	enableStdOut indicates that messages should be logged to STDOUT;
+	it is *strongly encouraged* to set at least one of enableStdOut or enableStdErr to true.
+
+	enableStdErr indicates that messages should be logged to STDERR;
+	it is *strongly encouraged* to set at least one of enableStdErr or enableStdOut to true.
+
 	See GetLogger's logConfigFlags argument and StdLogger.LogFlags for details on logFlags.
 */
-func (m *MultiLogger) AddStdLogger(identifier string, logFlags int) (err error) {
+func (m *MultiLogger) AddStdLogger(identifier string, enableStdOut, enableStdErr bool, logFlags int) (err error) {
 
 	var exists bool
 	var prefix string
@@ -54,10 +60,12 @@ func (m *MultiLogger) AddStdLogger(identifier string, logFlags int) (err error)
 	}
 
 	m.Loggers[identifier] = &StdLogger{
-		Logger:      nil,
+		Logger:       nil,
-		EnableDebug: m.EnableDebug,
+		EnableDebug:  m.EnableDebug,
-		Prefix:      m.Prefix,
+		Prefix:       m.Prefix,
-		LogFlags:    logFlags,
+		LogFlags:     logFlags,
+		EnableStdOut: enableStdOut,
+		EnableStdErr: enableStdErr,
 	}
 	if err = m.Loggers[identifier].Setup(); err != nil {
 		return
@@ -80,7 +88,7 @@ func (m *MultiLogger) AddStdLogger(identifier string, logFlags int) (err error)
 
 	logfilePath is a string for the path to the desired logfile.
 */
-func (m *MultiLogger) AddFileLogger(identifier string, enableStdOut, enableStdErr bool, logFlags int, logfilePath string) (err error) {
+func (m *MultiLogger) AddFileLogger(identifier string, logFlags int, logfilePath string) (err error) {
 
 	var exists bool
 	var success bool
@@ -122,9 +130,7 @@ func (m *MultiLogger) AddFileLogger(identifier string, enableStdOut, enableStdEr
 			Prefix:      m.Prefix,
 			LogFlags:    logFlags,
 		},
-		Path:         logfilePath,
+		Path: logfilePath,
-		EnableStdOut: enableStdOut,
-		EnableStdErr: enableStdErr,
 	}
 	if err = m.Loggers[identifier].Setup(); err != nil {
 		return

logging/funcs_multilogger_mgr_windows.go

@@ -65,7 +65,7 @@ func (m *MultiLogger) AddDefaultLogger(identifier string, eventIDs *WinEventID,
 
 	See GetLogger for details.
 */
-func (m *MultiLogger) AddWinLogger(identifier, source string, eventIDs *WinEventID) (err error) {
+func (m *MultiLogger) AddWinLogger(identifier string, eventIDs *WinEventID) (err error) {
 
 	var exists bool
 	var prefix string
@@ -84,9 +84,9 @@ func (m *MultiLogger) AddWinLogger(identifier, source string, eventIDs *WinEvent
 	}
 
 	m.Loggers[identifier] = &WinLogger{
-		Prefix:      source,
+		Prefix:      m.Prefix,
 		EnableDebug: m.EnableDebug,
-		eids:        eventIDs,
+		EIDs:        eventIDs,
 	}
 	if err = m.Loggers[identifier].Setup(); err != nil {
 		return

logging/funcs_std.go

@@ -2,6 +2,7 @@ package logging
 
 import (
 	"fmt"
+	`io`
 	`log`
 	`os`
 	`strings`
@@ -13,14 +14,34 @@ import (
 */
 func (l *StdLogger) Setup() (err error) {
 
+	var multi io.Writer
+
 	// This uses a shared handle across the import. We don't want that.
 	// l.Logger = log.Default()
 	if l.Prefix != "" {
 		l.Prefix = strings.TrimRight(l.Prefix, " ") + " "
 		// l.Logger.SetPrefix(l.Prefix)
 	}
-	// (stdlib).log.std is returned by log.Default(), which uses os.Stderr.
+	// (stdlib).log.std is returned by log.Default(), which uses os.Stderr but we have flags for that.
-	l.Logger = log.New(os.Stderr, l.Prefix, l.LogFlags)
+	// https://stackoverflow.com/a/36719588/733214
+	switch {
+	case l.EnableStdErr && l.EnableStdOut:
+		multi = io.MultiWriter(os.Stdout, os.Stderr)
+	case l.EnableStdErr:
+		multi = os.Stderr
+	case l.EnableStdOut:
+		multi = os.Stdout
+	default:
+		multi = nil
+	}
+	if multi != nil {
+		l.Logger = log.New(multi, l.Prefix, l.LogFlags)
+	} else {
+		// This honestly should throw an error.
+		l.Logger = &log.Logger{}
+		l.Logger.SetPrefix(l.Prefix)
+		l.Logger.SetFlags(l.LogFlags)
+	}
 
 	return
 }

logging/funcs_test.go

@@ -1 +1,196 @@
 package logging
+
+import (
+	`os`
+	`testing`
+)
+
+/*
+	TestStdLogger tests functionality for StdLogger.
+*/
+func TestStdLogger(t *testing.T) {
+
+	var l *StdLogger
+	var ltype string = "StdLogger"
+	var prefix string
+	var err error
+
+	l = &StdLogger{
+		EnableDebug:  true,
+		Prefix:       TestLogPrefix,
+		LogFlags:     logFlags,
+		EnableStdOut: false,
+		EnableStdErr: true,
+	}
+
+	if err = l.Setup(); err != nil {
+		t.Fatalf("error when running Setup: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if prefix != (TestLogPrefix + " ") { // StdLogger adds a space at the end.
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else if l.EnableDebug {
+		t.Fatalf("did not properly set Debug filter state")
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}
+
+/*
+	TestFileLogger tests functionality for FileLogger.
+	If the appropriate env var is set (see the EnvVarKeepLog constant), the temporary log file that is created will not be cleaned up.
+*/
+func TestFileLogger(t *testing.T) {
+
+	var l *FileLogger
+	var ltype string = "FileLogger"
+	var prefix string
+	var tempfile *os.File
+	var tempfilePath string
+	var keepLog bool
+	var err error
+
+	if tempfile, err = os.CreateTemp("", ".LOGGINGTEST_*"); err != nil {
+		t.Fatalf("error when creating temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+	tempfilePath = tempfile.Name()
+	// We can close the handler immediately; we don't need it since the FileLogger opens its own.
+	if err = tempfile.Close(); err != nil {
+		t.Fatalf("error when closing handler for temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+
+	l = &FileLogger{
+		StdLogger: StdLogger{
+			EnableDebug: true,
+			Prefix:      TestLogPrefix,
+			LogFlags:    logFlags,
+		},
+		Path: tempfilePath,
+	}
+
+	if err = l.Setup(); err != nil {
+		t.Fatalf("error when running Setup: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if prefix != (TestLogPrefix + " ") { // StdLogger (and thus FileLogger) adds a space at the end.
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else if l.EnableDebug {
+		t.Fatalf("did not properly set Debug filter state")
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	_, keepLog = os.LookupEnv(EnvVarKeepLog)
+
+	if !keepLog {
+		if err = os.Remove(tempfilePath); err != nil {
+			t.Fatalf("error when removing temporary log file '%v': %v", tempfilePath, err.Error())
+		}
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}

logging/funcs_windows.go

@@ -90,7 +90,7 @@ func GetLogger(enableDebug bool, source string, eventIDs *WinEventID, logConfigF
 		logger = &WinLogger{
 			Prefix:      source,
 			EnableDebug: enableDebug,
-			eids:        eventIDs,
+			EIDs:        eventIDs,
 		}
 	} else {
 		if logFlags.HasFlag(LogFile) {

logging/funcs_windows_test.go

@@ -0,0 +1,205 @@
+package logging
+
+import (
+	`fmt`
+	`os`
+	`testing`
+)
+
+/*
+	TestWinLogger tests functionality for WinLogger.
+	You will probably need to run it with an Administrator shell.
+*/
+func TestWinLogger(t *testing.T) {
+
+	var l *WinLogger
+	var ltype string = "WinLogger"
+	var prefix string
+	var exists bool
+	var err error
+
+	l = &WinLogger{
+		EnableDebug:   true,
+		Prefix:        TestLogPrefix,
+		RemoveOnClose: true,
+		EIDs:          DefaultEventID,
+	}
+
+	if exists, err = l.Exists(); err != nil {
+		t.Fatalf("error when checking for existence of registered Event Log source '%v': %v", TestLogPrefix, err.Error())
+	} else {
+		t.Logf("Prefix (source) '%v' exists before setup: %v", TestLogPrefix, exists)
+	}
+
+	if err = l.Setup(); err != nil {
+		t.Fatalf("error when running Setup: %v", err.Error())
+	}
+
+	if exists, err = l.Exists(); err != nil {
+		t.Fatalf("error when checking for existence of registered Event Log source '%v': %v", TestLogPrefix, err.Error())
+	} else {
+		t.Logf("Prefix (source) '%v' exists after setup: %v", TestLogPrefix, exists)
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if prefix != TestLogPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else if l.EnableDebug {
+		t.Fatalf("did not properly set Debug filter state")
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}
+
+// TestDefaultLogger tests GetLogger.
+func TestDefaultLogger(t *testing.T) {
+
+	var l Logger
+	var tempfile *os.File
+	var tempfilePath string
+	var keepLog bool
+	var ltype string
+	var prefix string
+	var testPrefix string
+	var err error
+
+	if tempfile, err = os.CreateTemp("", ".LOGGINGTEST_*"); err != nil {
+		t.Fatalf("error when creating temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+	tempfilePath = tempfile.Name()
+	// We can close the handler immediately; we don't need it since the FileLogger opens its own.
+	if err = tempfile.Close(); err != nil {
+		t.Fatalf("error when closing handler for temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+
+	if l, err = GetLogger(true, TestLogPrefix, DefaultEventID, logFlags, tempfilePath); err != nil {
+		t.Fatalf("error when spawning default Windows logger via GetLogger: %v", err.Error())
+	}
+
+	ltype = fmt.Sprintf("%T", l)
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if ltype == "StdLogger" || ltype == "FileLogger" { // StdLogger (and thus FileLogger) adds a space at the end.
+		testPrefix = TestLogPrefix + " "
+	} else {
+		testPrefix = TestLogPrefix
+	}
+
+	if prefix != testPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	_, keepLog = os.LookupEnv(EnvVarKeepLog)
+
+	if !keepLog {
+		if err = os.Remove(tempfilePath); err != nil {
+			t.Fatalf("error when removing temporary log file '%v': %v", tempfilePath, err.Error())
+		}
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}

logging/funcs_winlogger_windows.go

@@ -29,14 +29,14 @@ func (l *WinLogger) Setup() (err error) {
 		Since we use eventcreate, all Event IDs must be 1 <= eid <= 1000.
 	*/
 	for _, eid := range []uint32{
-		l.eids.Alert,
+		l.EIDs.Alert,
-		l.eids.Crit,
+		l.EIDs.Crit,
-		l.eids.Debug,
+		l.EIDs.Debug,
-		l.eids.Emerg,
+		l.EIDs.Emerg,
-		l.eids.Err,
+		l.EIDs.Err,
-		l.eids.Info,
+		l.EIDs.Info,
-		l.eids.Notice,
+		l.EIDs.Notice,
-		l.eids.Warning,
+		l.EIDs.Warning,
 	} {
 		if !((eid <= EIDMax) && (EIDMin <= eid)) {
 			err = ErrBadEid
@@ -204,7 +204,7 @@ func (l *WinLogger) Alert(s string, v ...interface{}) (err error) {
 	}
 
 	// Treat ALERT as Warning
-	err = l.elog.Warning(l.eids.Alert, msg)
+	err = l.elog.Warning(l.EIDs.Alert, msg)
 
 	return
 }
@@ -221,7 +221,7 @@ func (l *WinLogger) Crit(s string, v ...interface{}) (err error) {
 	}
 
 	// Treat CRIT as Error
-	err = l.elog.Error(l.eids.Crit, msg)
+	err = l.elog.Error(l.EIDs.Crit, msg)
 
 	return
 }
@@ -242,7 +242,7 @@ func (l *WinLogger) Debug(s string, v ...interface{}) (err error) {
 	}
 
 	// Treat DEBUG as Info
-	err = l.elog.Info(l.eids.Debug, msg)
+	err = l.elog.Info(l.EIDs.Debug, msg)
 
 	return
 
@@ -260,7 +260,7 @@ func (l *WinLogger) Emerg(s string, v ...interface{}) (err error) {
 	}
 
 	// Treat EMERG as Error
-	err = l.elog.Error(l.eids.Emerg, msg)
+	err = l.elog.Error(l.EIDs.Emerg, msg)
 
 	return
 
@@ -277,7 +277,7 @@ func (l *WinLogger) Err(s string, v ...interface{}) (err error) {
 		msg = s
 	}
 
-	err = l.elog.Error(l.eids.Err, msg)
+	err = l.elog.Error(l.EIDs.Err, msg)
 
 	return
 
@@ -294,7 +294,7 @@ func (l *WinLogger) Info(s string, v ...interface{}) (err error) {
 		msg = s
 	}
 
-	err = l.elog.Info(l.eids.Info, msg)
+	err = l.elog.Info(l.EIDs.Info, msg)
 
 	return
 
@@ -312,7 +312,7 @@ func (l *WinLogger) Notice(s string, v ...interface{}) (err error) {
 	}
 
 	// Treat NOTICE as Info
-	err = l.elog.Info(l.eids.Notice, msg)
+	err = l.elog.Info(l.EIDs.Notice, msg)
 
 	return
 
@@ -329,7 +329,7 @@ func (l *WinLogger) Warning(s string, v ...interface{}) (err error) {
 		msg = s
 	}
 
-	err = l.elog.Warning(l.eids.Warning, msg)
+	err = l.elog.Warning(l.EIDs.Warning, msg)
 
 	return
 

logging/muiltilogger_linux_test.go

@@ -0,0 +1,121 @@
+package logging
+
+import (
+	`os`
+	`testing`
+)
+
+// TestMultiLogger tests GetMultiLogger and MultiLogger methods.
+func TestMultiLogger(t *testing.T) {
+
+	var l *MultiLogger
+	var tempfile *os.File
+	var tempfilePath string
+	var keepLog bool
+	var ltype string = "MultiLogger"
+	var prefix string
+	var testPrefix string
+	var err error
+
+	if tempfile, err = os.CreateTemp("", ".LOGGINGTEST_*"); err != nil {
+		t.Fatalf("error when creating temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+	tempfilePath = tempfile.Name()
+	// We can close the handler immediately; we don't need it since the FileLogger opens its own.
+	if err = tempfile.Close(); err != nil {
+		t.Fatalf("error when closing handler for temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+
+	l = GetMultiLogger(true, TestLogPrefix)
+
+	if err = l.AddStdLogger("StdLogger", false, true, logFlags); err != nil {
+		t.Fatalf("error when adding StdLogger to MultiLogger: %v", err.Error())
+	}
+	if err = l.AddFileLogger("FileLogger", logFlags, tempfilePath); err != nil {
+		t.Fatalf("error when adding FileLogger to MultiLogger: %v", err.Error())
+	}
+
+	if err = l.AddDefaultLogger("DefaultLogger", logFlags, tempfilePath); err != nil {
+		t.Fatalf("error when adding default logger to MultiLogger: %v", err.Error())
+	}
+
+	if err = l.AddSysdLogger("SystemDLogger"); err != nil {
+		t.Fatalf("error when adding SystemDLogger to MultiLogger: %v", err.Error())
+	}
+	if err = l.AddSyslogLogger("SyslogLogger"); err != nil {
+		t.Fatalf("error when adding SyslogLogger to MultiLogger: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if ltype == "StdLogger" || ltype == "FileLogger" { // StdLogger (and thus FileLogger) adds a space at the end.
+		testPrefix = TestLogPrefix + " "
+	} else {
+		testPrefix = TestLogPrefix
+	}
+
+	if prefix != testPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	_, keepLog = os.LookupEnv(EnvVarKeepLog)
+
+	if !keepLog {
+		if err = os.Remove(tempfilePath); err != nil {
+			t.Fatalf("error when removing temporary log file '%v': %v", tempfilePath, err.Error())
+		}
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}

logging/multilogger_windows_test.go

@@ -0,0 +1,118 @@
+package logging
+
+import (
+	`os`
+	`testing`
+)
+
+// TestMultiLogger tests GetMultiLogger and MultiLogger methods.
+func TestMultiLogger(t *testing.T) {
+
+	var l *MultiLogger
+	var tempfile *os.File
+	var tempfilePath string
+	var keepLog bool
+	var ltype string = "MultiLogger"
+	var prefix string
+	var testPrefix string
+	var err error
+
+	if tempfile, err = os.CreateTemp("", ".LOGGINGTEST_*"); err != nil {
+		t.Fatalf("error when creating temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+	tempfilePath = tempfile.Name()
+	// We can close the handler immediately; we don't need it since the FileLogger opens its own.
+	if err = tempfile.Close(); err != nil {
+		t.Fatalf("error when closing handler for temporary log file '%v': %v", tempfile.Name(), err.Error())
+	}
+
+	l = GetMultiLogger(true, TestLogPrefix)
+
+	if err = l.AddStdLogger("StdLogger", false, true, logFlags); err != nil {
+		t.Fatalf("error when adding StdLogger to MultiLogger: %v", err.Error())
+	}
+	if err = l.AddFileLogger("FileLogger", logFlags, tempfilePath); err != nil {
+		t.Fatalf("error when adding FileLogger to MultiLogger: %v", err.Error())
+	}
+
+	if err = l.AddDefaultLogger("DefaultLogger", DefaultEventID, logFlags, tempfilePath); err != nil {
+		t.Fatalf("error when adding default logger to MultiLogger: %v", err.Error())
+	}
+
+	if err = l.AddWinLogger("WinLogger", DefaultEventID); err != nil {
+		t.Fatalf("error when adding WinLogger to MultiLogger: %v", err.Error())
+	}
+
+	t.Logf("Logger %v passed Setup. Logger: %#v", ltype, l)
+
+	if err = l.Alert(testAlert, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Crit(testCrit, ltype); err != nil {
+		t.Fatalf("error for Crit: %v", err.Error())
+	}
+
+	if err = l.Debug(testDebug, ltype); err != nil {
+		t.Fatalf("error for Debug: %v", err.Error())
+	}
+
+	if err = l.Emerg(testEmerg, ltype); err != nil {
+		t.Fatalf("error for Emerg: %v", err.Error())
+	}
+
+	if err = l.Err(testErr, ltype); err != nil {
+		t.Fatalf("error for Err: %v", err.Error())
+	}
+
+	if err = l.Info(testInfo, ltype); err != nil {
+		t.Fatalf("error for Alert: %v", err.Error())
+	}
+
+	if err = l.Notice(testNotice, ltype); err != nil {
+		t.Fatalf("error for Notice: %v", err.Error())
+	}
+
+	if err = l.Warning(testWarning, ltype); err != nil {
+		t.Fatalf("error for Warning: %v", err.Error())
+	}
+
+	if prefix, err = l.GetPrefix(); err != nil {
+		t.Fatalf("error when fetching prefix: %v", err.Error())
+	}
+
+	if ltype == "StdLogger" || ltype == "FileLogger" { // StdLogger (and thus FileLogger) adds a space at the end.
+		testPrefix = TestLogPrefix + " "
+	} else {
+		testPrefix = TestLogPrefix
+	}
+
+	if prefix != testPrefix {
+		t.Fatalf("true prefix ('%v') does not match TestLogPrefix ('%v')", prefix, TestLogPrefix)
+	}
+	if err = l.SetPrefix(TestLogAltPrefix); err != nil {
+		t.Fatalf("error when setting prefix to %v: %v", TestLogAltPrefix, err.Error())
+	} else {
+		_ = l.SetPrefix(TestLogPrefix)
+	}
+
+	if err = l.DoDebug(false); err != nil {
+		t.Fatalf("error when changing debug to false: %v", err.Error())
+	} else {
+		_ = l.DoDebug(true)
+	}
+
+	if err = l.Shutdown(); err != nil {
+		t.Fatalf("Error when running Shutdown: %v", err.Error())
+	}
+
+	_, keepLog = os.LookupEnv(EnvVarKeepLog)
+
+	if !keepLog {
+		if err = os.Remove(tempfilePath); err != nil {
+			t.Fatalf("error when removing temporary log file '%v': %v", tempfilePath, err.Error())
+		}
+	}
+
+	t.Logf("Logger %v passed all logging targets.", ltype)
+}

logging/types.go

@@ -48,6 +48,26 @@ type StdLogger struct {
 		You will need to run *StdLogger.Shutdown and then *StdLogger.Setup again if you wish to change this.
 	*/
 	LogFlags int
+	/*
+		EnableStdOut is true if the log will send to STDOUT.
+		If false (default), no output will be written to STDOUT.
+		You will need to run StdLogger.Shutdown and then StdLogger.Setup again if you wish to change this.
+
+		If EnableStdOut is false and EnableStdErr is false, no logging output will occur by default
+		and StdLogger.Logger will be largely useless.
+		It will be up to you to modify the underlying log.Logger to behave as you want.
+	*/
+	EnableStdOut bool
+	/*
+		EnableStdErr is true if the log will send to STDERR.
+		If false (default), no output will be written to STDERR.
+		You will need to run StdLogger.Shutdown and then StdLogger.Setup again if you wish to change this.
+
+		If EnableStdErr is false and EnableStdOut is false, no logging output will occur by default
+		and StdLogger.Logger will be largely useless.
+		It will be up to you to modify the underlying log.Logger to behave as you want.
+	*/
+	EnableStdErr bool
 }
 
 /*
@@ -62,18 +82,6 @@ type FileLogger struct {
 	StdLogger
 	// Path is the path to the logfile.
 	Path string
-	/*
-		EnableStdOut is true if the log will send to STDOUT as well as the file (and STDERR if FileLogger.EnableStdErr == true).
-		If false (default), it will only (silently) write to the log file.
-		You will need to run FileLogger.Shutdown and then FileLogger.Setup again if you wish to change this.
-	*/
-	EnableStdOut bool
-	/*
-		EnableStdErr is true if the log will send to STDERR as well as the file (and STDOUT if FileLogger.EnableStdOut == true).
-		If false (default), it will only (silently) write to the log file.
-		You will need to run *FileLogger.Shutdown and then *FileLogger.Setup again if you wish to change this.
-	*/
-	EnableStdErr bool
 	// writer is used for the writing out of the log file.
 	writer *os.File
 }

logging/types_linux.go

@@ -4,11 +4,15 @@ import (
 	`log/syslog`
 )
 
+/*
+	SystemDLogger (yes, I'm aware it's actually written as "systemd") writes to journald on systemd-enabled systems.
+*/
 type SystemDLogger struct {
 	EnableDebug bool
 	Prefix      string
 }
 
+// SyslogLogger writes to syslog on syslog-enabled systems.
 type SyslogLogger struct {
 	EnableDebug bool
 	Prefix      string

logging/types_windows.go

@@ -39,8 +39,8 @@ type WinLogger struct {
 	RemoveOnClose bool
 	// elog is the actual writer to the Event Log.
 	elog *eventlog.Log
-	// eids is used to look up what event ID to use when writing to a WinLogger.elog.
+	// EIDs is used to look up what event ID to use when writing to a WinLogger.elog.
-	eids *WinEventID
+	EIDs *WinEventID
 }
 
 /*