TUN-3198: Handle errors while running tunnel UI

logger/create.go

@@ -85,6 +85,14 @@ func LogLevelString(level string) Option {
 	}
 }
 
+func GetSupportedLevels(level string) ([]Level, error) {
+	supported, err := ParseLevelString(level)
+	if err != nil {
+		return nil, err
+	}
+	return supported, nil
+}
+
 // Parse builds the Options struct so the caller knows what actions should be run
 func Parse(opts ...Option) (*Options, error) {
 	options := &Options{}
@@ -98,7 +106,7 @@ func Parse(opts ...Option) (*Options, error) {
 
 // New setups a new logger based on the options.
 // The default behavior is to write to standard out
-func New(opts ...Option) (Service, error) {
+func New(opts ...Option) (*OutputWriter, error) {
 	config, err := Parse(opts...)
 
 	if err != nil {
@@ -123,6 +131,7 @@ func New(opts ...Option) (Service, error) {
 			l.Add(os.Stderr, terminalFormatter, config.supportedTerminalLevels...)
 		}
 	}
+
 	return l, nil
 }
 

logger/formatter.go

@@ -63,6 +63,12 @@ type TerminalFormatter struct {
 	supportsColor bool
 }
 
+// UIFormatter is used for streaming logs to UI
+type UIFormatter struct {
+	format        string
+	supportsColor bool
+}
+
 // NewTerminalFormatter creates a Terminal formatter for colored output
 // format is the time format to use for timestamp formatting
 func NewTerminalFormatter(format string) Formatter {
@@ -73,10 +79,39 @@ func NewTerminalFormatter(format string) Formatter {
 	}
 }
 
+func NewUIFormatter(format string) Formatter {
+	supportsColor := (runtime.GOOS != "windows")
+	return &UIFormatter{
+		format:        format,
+		supportsColor: supportsColor,
+	}
+}
+
+// Timestamp uses formatting that is tview-specific for UI
+func (f *UIFormatter) Timestamp(l Level, d time.Time) string {
+	t := ""
+	dateStr := "[" + d.Format(f.format) + "] "
+	switch l {
+	case InfoLevel:
+		t = "[#00ffff]INFO[white]"
+	case ErrorLevel:
+		t = "[red]ERROR[white]"
+	case DebugLevel:
+		t = "[yellow]DEBUG[white]"
+	case FatalLevel:
+		t = "[red]FATAL[white]"
+	}
+	return t + dateStr
+}
+
+func (f *UIFormatter) Content(l Level, c string) string {
+	return c
+}
+
 // Timestamp returns the log level with a matching color to the log type
 func (f *TerminalFormatter) Timestamp(l Level, d time.Time) string {
 	t := ""
-	dateStr := "[" + d.Format(f.format) + "] " 
+	dateStr := "[" + d.Format(f.format) + "] "
 	switch l {
 	case InfoLevel:
 		t = f.output("INFO", skittles.Cyan)