more general syslog support

logging/funcs_multilogger_mgr_nix.go

@@ -0,0 +1,63 @@
+//go:build !(windows || plan9 || wasip1 || js || ios)
+// +build !windows,!plan9,!wasip1,!js,!ios
+
+package logging
+
+import (
+	"os"
+
+	"github.com/google/uuid"
+	"r00t2.io/sysutils/paths"
+)
+
+/*
+AddSyslogLogger adds a SyslogLogger to a MultiLogger.
+
+identifier is a string to use to identify the added SyslogLogger in MultiLogger.Loggers.
+If empty, one will be automatically generated.
+*/
+func (m *MultiLogger) AddSyslogLogger(identifier string) (err error) {
+
+	var exists bool
+	var hasSyslog bool
+	var stat os.FileInfo
+	var devlogPath string = devlog
+	var prefix string
+
+	if identifier == "" {
+		identifier = uuid.New().String()
+	}
+
+	if _, exists = m.Loggers[identifier]; exists {
+		err = ErrExistingLogger
+		return
+	}
+
+	if hasSyslog, stat, err = paths.RealPathExistsStat(&devlogPath); hasSyslog && err != nil {
+		return
+	} else if !hasSyslog {
+		err = ErrNoSyslog
+		return
+	}
+
+	if stat.Mode().IsRegular() {
+		err = ErrInvalidDevLog
+		return
+	}
+
+	m.Loggers[identifier] = &SyslogLogger{
+		EnableDebug: m.EnableDebug,
+		Prefix:      m.Prefix,
+	}
+	if err = m.Loggers[identifier].Setup(); err != nil {
+		return
+	}
+
+	if prefix, err = m.Loggers[identifier].GetPrefix(); err != nil {
+		return
+	}
+
+	m.Loggers[identifier].Debug("logger initialized of type %T with prefix %v", m.Loggers[identifier], prefix)
+
+	return
+}