Debugging: Implement a basic level-based file logger

1 files changed, 63 insertions, 0 deletions

diff --git a/src/log.go b/src/log.go
new file mode 100644
index 0000000..6ee81e3
--- /dev/null
+++ b/src/log.go
@@ -0,0 +1,63 @@
+package eduvpn
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path"
+)
+
+type FileLogger struct {
+	Level LogLevel
+	File  *os.File
+}
+
+type LogLevel int8
+
+const (
+	LOG_INFO LogLevel = iota
+	LOG_WARNING
+	LOG_ERROR
+)
+
+func (e LogLevel) String() string {
+	switch e {
+	case LOG_INFO:
+		return "INFO"
+	case LOG_WARNING:
+		return "WARNING"
+	case LOG_ERROR:
+		return "ERROR"
+	default:
+		return "UNKNOWN"
+	}
+}
+
+func (eduvpn *VPNState) getLogFilename() string {
+	pathString := path.Join(eduvpn.ConfigDirectory, eduvpn.Name)
+	return fmt.Sprintf("%s.log", pathString)
+}
+
+func (eduvpn *VPNState) InitLog(level LogLevel) error {
+	configDirErr := eduvpn.EnsureConfigDir()
+	if configDirErr != nil {
+		return configDirErr
+	}
+	logFile, logOpenErr := os.OpenFile(eduvpn.getLogFilename(), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o666)
+	if logOpenErr != nil {
+		return logOpenErr
+	}
+	log.SetOutput(logFile)
+	eduvpn.LogFile = &FileLogger{Level: level, File: logFile}
+	return nil
+}
+
+func (eduvpn *VPNState) Log(level LogLevel, str string) {
+	if level >= eduvpn.LogFile.Level {
+		log.Printf("[%s]: %s", level.String(), str)
+	}
+}
+
+func (eduvpn *VPNState) CloseLog() {
+	eduvpn.LogFile.File.Close()
+}