- compile message templates

- send metrics to cachet
- fix http default configuration

template.go

@@ -1,6 +1,38 @@
 package cachet
 
+import "text/template"
+
 type MessageTemplate struct {
 	Subject string `json:"subject"`
 	Message string `json:"message"`
+
+	subjectTpl *template.Template
+	messageTpl *template.Template
+}
+
+func (t *MessageTemplate) SetDefault(d MessageTemplate) {
+	if len(t.Subject) == 0 {
+		t.Subject = d.Subject
+	}
+	if len(t.Message) == 0 {
+		t.Message = d.Message
+	}
+}
+
+func (t *MessageTemplate) Compile() error {
+	var err error
+
+	if len(t.Subject) > 0 {
+		t.subjectTpl, err = compileTemplate(t.Subject)
+	}
+
+	if err != nil && len(t.Message) > 0 {
+		t.messageTpl, err = compileTemplate(t.Message)
+	}
+
+	return err
+}
+
+func compileTemplate(text string) (*template.Template, error) {
+	return template.New("").Parse(text)
 }