Z80 basic impl completed

logger/logger.go

@@ -0,0 +1,85 @@
+package logger
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var logFile *os.File = nil
+var logBuffer *bufio.Writer = nil
+
+type LogFormatter struct {
+}
+
+func (f *LogFormatter) Format(entry *log.Entry) ([]byte, error) {
+	caller := "-"
+	if entry.HasCaller() {
+		caller = filepath.Base(entry.Caller.File) + ":" + strconv.Itoa(entry.Caller.Line)
+	}
+	lvl := strings.ToUpper(entry.Level.String())
+	if len(lvl) > 0 {
+		lvl = lvl[0:1]
+	} else {
+		lvl = "-"
+	}
+	logMessage := fmt.Sprintf("%s[%s][%s]: %s\n", entry.Time.Format("2006-01-02T15:04:05"), lvl, caller, entry.Message) //time.RFC3339
+
+	return []byte(logMessage), nil
+}
+
+// InitLogging Initialise logging format and level
+func InitLogging() {
+	log.SetFormatter(new(LogFormatter))
+	log.SetLevel(log.DebugLevel)
+	log.SetReportCaller(true)
+	log.SetOutput(os.Stdout)
+}
+
+// FlushLogs Flush logs if logging to file
+func FlushLogs() {
+	if logBuffer != nil {
+		err := logBuffer.Flush()
+		if err != nil {
+			return
+		}
+	}
+}
+
+// ReconfigureLogging Reconfigure logging by config values
+func ReconfigureLogging(config *config.ServiceConfig) {
+	// redirect logging if log file specified
+	if len(config.LogFile) > 0 {
+		var err error
+		logFile, err = os.OpenFile(config.LogFile, os.O_WRONLY|syscall.O_CREAT|syscall.O_APPEND, 0664)
+		if err != nil {
+			log.Fatalf("Can not access to log file: %s\n%v", config.LogFile, err)
+		}
+		logBuffer = bufio.NewWriter(logFile)
+		log.SetOutput(logBuffer)
+	}
+	if len(config.LogLevel) > 0 {
+		level, err := log.ParseLevel(config.LogLevel)
+		if err != nil {
+			log.Fatalf("Can not parse log level: %s\n%v", config.LogLevel, err)
+		}
+		log.SetLevel(level)
+	}
+}
+
+// CloseLogs If log output is file, flush and close it
+func CloseLogs() {
+	FlushLogs()
+	if logFile != nil {
+		err := logFile.Close()
+		if err != nil {
+			log.Warnf("Can not close log file: %s\n%v", logFile.Name(), err)
+		}
+	}
+}