func (r *Route53) query(method, path string, req, resp interface{}) error {
params := make(map[string]string)
endpoint, err := url.Parse(r.Region.Route53Endpoint)
if err != nil {
return err
}
endpoint.Path = path
sign(r.Auth, endpoint.Path, params)
// If they look like url.Values, just encode...
if queryArgs, ok := req.(url.Values); ok {
endpoint.RawQuery = queryArgs.Encode()
req = nil
}
// Encode the body
var body io.ReadWriter
if req != nil {
bodyBuf := bytes.NewBuffer(nil)
enc := xml.NewEncoder(bodyBuf)
start := xml.StartElement{
Name: xml.Name{
Space: "",
Local: reflect.Indirect(reflect.ValueOf(req)).Type().Name(),
},
Attr: []xml.Attr{{xml.Name{"", "xmlns"}, "https://route53.amazonaws.com/doc/2013-04-01/"}},
}
if err := enc.EncodeElement(req, start); err != nil {
return err
}
// This is really a sadness, but can't think of a better way to
// do this for now in Go's constructs.
replace := "<ResourceRecords><ResourceRecord></ResourceRecord></ResourceRecords>"
if strings.Contains(bodyBuf.String(), replace) {
var newBuf bytes.Buffer
newBuf.WriteString(strings.Replace(bodyBuf.String(), replace, "", -1))
bodyBuf = &newBuf
}
// http://docs.aws.amazon.com/Route53/latest/APIReference/CreateAliasRRSAPI.html
if reflect.Indirect(reflect.ValueOf(req)).Type().Name() == "ChangeResourceRecordSetsRequest" {
for _, change := range req.(ChangeResourceRecordSetsRequest).Changes {
if change.Record.AliasTarget != nil {
replace := change.Record.Type + "</Type><TTL>0</TTL>"
var newBuf bytes.Buffer
newBuf.WriteString(strings.Replace(bodyBuf.String(), replace, change.Record.Type+"</Type>", -1))
bodyBuf = &newBuf
}
}
}
body = bodyBuf
}
// Make the http request
hReq, err := http.NewRequest(method, endpoint.String(), body)
if err != nil {
return err
}
for k, v := range params {
hReq.Header.Set(k, v)
}
re, err := r.httpClient.Do(hReq)
if err != nil {
return err
}
defer re.Body.Close()
// Check the status code
switch re.StatusCode {
case 200:
case 201:
default:
var body bytes.Buffer
io.Copy(&body, re.Body)
return fmt.Errorf("Request failed, got status code: %d. Response: %s",
re.StatusCode, body.Bytes())
}
// Decode the response
decoder := xml.NewDecoder(re.Body)
return decoder.Decode(resp)
}