Better debug logging + unit tests

errors.go

@@ -10,16 +10,19 @@ import (
 )
 
 const (
-	ErrorTypeInternal = 1 << iota
-	ErrorTypeExternal = 1 << iota
-	ErrorTypeAll      = 0xffffffff
+	ErrorTypePrivate = 1 << iota
+	ErrorTypePublic  = 1 << iota
+)
+
+const (
+	ErrorMaskAny = 0xffffffff
 )
 
 // Used internally to collect errors that occurred during an http request.
 type errorMsg struct {
-	Err  string      `json:"error"`
-	Type int         `json:"-"`
-	Meta interface{} `json:"meta"`
+	Error error       `json:"error"`
+	Type  int         `json:"-"`
+	Meta  interface{} `json:"meta"`
 }
 
 type errorMsgs []errorMsg
@@ -37,14 +40,24 @@ func (a errorMsgs) ByType(typ int) errorMsgs {
 	return result
 }
 
+func (a errorMsgs) Errors() []string {
+	if len(a) == 0 {
+		return []string{}
+	}
+	errors := make([]string, len(a))
+	for i, err := range a {
+		errors[i] = err.Error.Error()
+	}
+	return errors
+}
+
 func (a errorMsgs) String() string {
 	if len(a) == 0 {
 		return ""
 	}
 	var buffer bytes.Buffer
 	for i, msg := range a {
-		text := fmt.Sprintf("Error #%02d: %s\n     Meta: %v\n", (i + 1), msg.Err, msg.Meta)
-		buffer.WriteString(text)
+		fmt.Fprintf(&buffer, "Error #%02d: %s\n     Meta: %v\n", (i + 1), msg.Error, msg.Meta)
 	}
 	return buffer.String()
 }