first commit

README.md

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+# Log

go.mod

@@ -0,0 +1,3 @@
+module github.com/pscompsci/go-log
+
+go 1.13

log.go

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+package log
+
+import (
+	"fmt"
+	"os"
+	"sync"
+	"time"
+)
+
+// Level ...
+type Level int
+
+const (
+	debug Level = 0
+	info  Level = 1
+	warn  Level = 2
+	err   Level = 3
+	fatal Level = 4
+)
+
+// Logger ...
+type Logger struct {
+	filename   string
+	mutex      *sync.Mutex
+	level      Level
+	timeformat string
+}
+
+// NewLogger ...
+func NewLogger(filename string, timeformat string) *Logger {
+	l := &Logger{
+		filename:   filename,
+		mutex:      &sync.Mutex{},
+		level:      debug,
+		timeformat: timeformat,
+	}
+	return l
+}
+
+// TimeFormat ...
+func (l *Logger) TimeFormat(timeformat string) {
+	l.timeformat = timeformat
+}
+
+// SetLevel ...
+func (l *Logger) SetLevel(level string) {
+	switch level {
+	case "DEBUG":
+		l.level = debug
+		break
+	case "INFO":
+		l.level = info
+		break
+	case "WARN":
+		l.level = warn
+		break
+	case "ERROR":
+		l.level = err
+		break
+	case "FATAL":
+		l.level = fatal
+		break
+	default:
+		l.level = debug
+	}
+}
+
+// Debug ...
+func (l *Logger) Debug(msg string) {
+	l.log(debug, msg)
+}
+
+// Debugf ...
+func (l *Logger) Debugf(msg string, values ...interface{}) {
+	message := fmt.Sprintf(msg, values...)
+	l.log(debug, message)
+}
+
+// Info ...
+func (l *Logger) Info(msg string) {
+	l.log(info, msg)
+}
+
+// Infof ...
+func (l *Logger) Infof(msg string, values ...interface{}) {
+	message := fmt.Sprintf(msg, values...)
+	l.log(info, message)
+}
+
+// Warn ...
+func (l *Logger) Warn(msg string) {
+	l.log(warn, msg)
+}
+
+// Warnf ...
+func (l *Logger) Warnf(msg string, values ...interface{}) {
+	message := fmt.Sprintf(msg, values...)
+	l.log(warn, message)
+}
+
+// Error ...
+func (l *Logger) Error(msg string) {
+	l.log(err, msg)
+}
+
+// Errorf ...
+func (l *Logger) Errorf(msg string, values ...interface{}) {
+	message := fmt.Sprintf(msg, values...)
+	l.log(err, message)
+}
+
+// Fatal ...
+func (l *Logger) Fatal(msg string) {
+	l.log(fatal, msg)
+}
+
+// Fatalf ...
+func (l *Logger) Fatalf(msg string, values ...interface{}) {
+	message := fmt.Sprintf(msg, values...)
+	l.log(fatal, message)
+}
+
+func (l *Logger) log(level Level, msg string) {
+	if level < l.level {
+		return
+	}
+
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+
+	fmtMsg := fmt.Sprintf("%s %s: %s%s\n", time.Now().Format(l.timeformat), level.toString(), msg)
+
+	logFile, err := os.OpenFile(l.filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0660)
+	if err != nil {
+		os.Stderr.WriteString((fmt.Sprintf("go-log: %s%s\n", fmtMsg)))
+		return
+	}
+	defer func() {
+		err := logFile.Close()
+		if err != nil {
+			os.Stderr.WriteString(fmt.Sprintf("Closing failed on log file: %s\n", l.filename))
+			return
+		}
+	}()
+
+	_, err = logFile.WriteString(fmtMsg)
+	if err != nil {
+		os.Stderr.WriteString(fmt.Sprintf("Writing failed to log file: %s\n", l.filename))
+		return
+	}
+}
+
+// toString ...
+func (level Level) toString() string {
+	levels := [...]string{
+		"DEBUG",
+		"INFO",
+		"WARN",
+		"ERROR",
+		"FATAL",
+	}
+	if level < debug || level > fatal {
+		return levels[debug]
+	}
+	return levels[level]
+}