fix errcheck issues (#80)

Author: godrei

log/json_logger.go

@@ -27,5 +27,7 @@ func NewDefaultJSONLoger() JSONLoger {
 
 // Print ...
 func (l JSONLoger) Print(f Formatable) {
-	fmt.Fprint(l.writer, f.JSON())
+	if _, err := fmt.Fprint(l.writer, f.JSON()); err != nil {
+		fmt.Printf("failed to print message: %s, error: %s\n", f.JSON(), err)
+	}
 }

log/print.go

@@ -11,7 +11,9 @@ func printf(severity Severity, withTime bool, format string, v ...interface{}) {
 		message = fmt.Sprintf("%s %s", timestampField(), message)
 	}
 
-	fmt.Fprintln(outWriter, message)
+	if _, err := fmt.Fprintln(outWriter, message); err != nil {
+		fmt.Printf("failed to print message: %s, error: %s\n", message, err)
+	}
 }
 
 // Successf ...

log/raw_logger.go

@@ -27,5 +27,7 @@ func NewDefaultRawLogger() RawLogger {
 
 // Print ...
 func (l RawLogger) Print(f Formatable) {
-	fmt.Fprintln(l.writer, f.String())
+	if _, err := fmt.Fprintln(l.writer, f.String()); err != nil {
+		fmt.Printf("failed to print message: %s, error: %s\n", f.String(), err)
+	}
 }

progress/spinner.go

@@ -45,7 +45,9 @@ func (s *Spinner) erase() {
 	n := utf8.RuneCountInString(s.lastOutput)
 	for _, c := range []string{"\b", " ", "\b"} {
 		for i := 0; i < n; i++ {
-			fmt.Fprintf(s.writer, c)
+			if _, err := fmt.Fprintf(s.writer, c); err != nil {
+				fmt.Printf("failed to update progress, error: %s\n", err)
+			}
 		}
 	}
 	s.lastOutput = ""
@@ -68,7 +70,9 @@ func (s *Spinner) Start() {
 					s.erase()
 
 					out := fmt.Sprintf("%s %s", s.message, s.chars[i])
-					fmt.Fprint(s.writer, out)
+					if _, err := fmt.Fprint(s.writer, out); err != nil {
+						fmt.Printf("failed to update progress, error: %s\n", err)
+					}
 					s.lastOutput = out
 
 					time.Sleep(s.delay)

progress/spinner_test.go

@@ -1,3 +1,5 @@
+// +build !race
+
 package progress
 
 import (

progress/wrapper.go

@@ -41,7 +41,9 @@ func (w Wrapper) WrapAction(action func()) {
 		if !strings.HasSuffix(message, ".") {
 			message = message + "..."
 		}
-		fmt.Fprintln(w.spinner.writer, message)
+		if _, err := fmt.Fprintln(w.spinner.writer, message); err != nil {
+			fmt.Printf("failed to print message: %s, error: %s", message, err)
+		}
 		action()
 	}
 }

progress/wrapper_test.go

@@ -1,3 +1,5 @@
+// +build !race
+
 package progress
 
 import (