// Resolve template variables to a string value and cache the value
func (e *ExecEnv) Resolve(tmpl string) (string, error) {
if val, ok := e.tmplCache[tmpl]; ok {
return val, nil
}
template, err := fasttmpl.NewTemplate(tmpl, startTag, endTag)
if err != nil {
return "", err
}
buff := &bytes.Buffer{}
_, err = template.ExecuteFunc(buff, e.templateContext)
if err == nil {
e.tmplCache[tmpl] = buff.String()
}
return buff.String(), err
}
func FqdnFromTemplate(template, serviceName, stackName, environmentName, rootDomainName string) string {
t, err := fasttemplate.NewTemplate(template, "%{{", "}}")
if err != nil {
logrus.Fatalf("error while parsing fqdn template: %s", err)
}
fqdn := t.ExecuteFuncString(func(w io.Writer, tag string) (int, error) {
switch tag {
case "service_name":
return w.Write([]byte(sanitizeLabel(serviceName)))
case "stack_name":
return w.Write([]byte(sanitizeLabel(stackName)))
case "environment_name":
return w.Write([]byte(sanitizeLabel(environmentName)))
default:
return 0, fmt.Errorf("invalid placeholder '%q' in fqdn template", tag)
}
})
labels := []string{fqdn, rootDomainName}
return strings.ToLower(strings.Join(labels, "."))
}
func _template(s string, context *gabs.Container, modify bool) (string, error) {
t, err := fasttemplate.NewTemplate(s, "{{", "}}")
if err != nil {
return "", err
}
w := bytesBufferPool.Get().(*bytes.Buffer)
if _, err := t.ExecuteFunc(w, func(w io.Writer, tag string) (int, error) {
tag = strings.TrimSpace(tag)
if value := context.Path(tag).Data(); value != nil {
if valueArr, ok := value.([]interface{}); ok && len(valueArr) > 0 {
value = valueArr[0]
}
return w.Write([]byte(fmt.Sprintf("%v", value)))
} else if modify && strings.Contains(tag, "|") {
if v, err := ModifyExec(tag, context); err == nil {
return w.Write([]byte(fmt.Sprintf("%v", v)))
}
}
if strings.HasPrefix(tag, "vars.") || context.ExistsP(tag) {
return 0, nil
}
return 0, fmt.Errorf("Undefined template variable: '%s'", tag)
}); err != nil {
return "", err
}
out := string(w.Bytes())
w.Reset()
bytesBufferPool.Put(w)
return out, nil
}
