func (provider) Transform(cfg map[string]interface{}) error {
metaURL, ok := cfg["packetMetaDataUrl"].(string)
if !ok {
metaURL = defaultPacketMetaDataURL
}
var data metadata
return config.ReplaceObjects(cfg, "packet", func(val map[string]interface{}) (interface{}, error) {
// Fetch packet metadata, if not already done
if data.InstanceID == "" {
g := got.New()
res, err := g.Get(metaURL).Send()
if err != nil {
return nil, fmt.Errorf("Failed to fetch packet metadata, error: %s", err)
}
err = json.Unmarshal(res.Body, &data)
if err != nil {
return nil, fmt.Errorf("Failed to parse packet metadata, error: %s", err)
}
if data.InstanceID == "" {
return nil, errors.New("Packet metadata isn't valid missing 'id' property")
}
}
key := val["$packet"].(string)
switch key {
case "instance-id":
return data.InstanceID, nil
case "hostname":
return data.Hostname, nil
case "facility":
return data.Facility, nil
case "instance-type":
return data.InstanceType, nil
case "public-ipv4":
for _, addr := range data.Network.Addresses {
if addr.Family == 4 && addr.Public {
return addr.Address, nil
}
}
return nil, ErrNoPublicIPv4Address
case "public-ipv6":
for _, addr := range data.Network.Addresses {
if addr.Family == 6 && addr.Public {
return addr.Address, nil
}
}
return nil, ErrNoPublicIPv6Address
default:
return nil, fmt.Errorf("Unknown $packet variable: %s", key)
}
})
}
// ListDisplays will fetch a list of displays offered by the socketURL.
func ListDisplays(socketURL string) ([]Display, error) {
// Parse socketURL and get query string
u, err := url.Parse(socketURL)
if err != nil {
return nil, fmt.Errorf("Invalid socketURL: %s, parsing error: %s",
socketURL, err)
}
// Ensure the URL has http or https as scheme
switch u.Scheme {
case "ws":
u.Scheme = "http"
case "wss":
u.Scheme = "https"
}
// Create a new got client
g := got.New()
g.Client = &http.Client{Timeout: 30 * time.Second}
g.MaxSize = 10 * 1024 * 1024 // 10 MiB should be more than enough
// Send a request
res, err := g.Get(u.String()).Send()
// If non-2xx error we try to parse the error
if rerr, ok := err.(*got.BadResponseCodeError); ok {
var errorMsg displayconsts.ErrorMessage
if json.Unmarshal(rerr.Response.Body, &errorMsg) == nil {
return nil, &errorMsg
}
return nil, fmt.Errorf("Failed to list displays got status code: %d",
res.StatusCode)
}
// Otherwise we just wrap the error for better interpretation
if err != nil {
return nil, fmt.Errorf("Failed to list displays, error: %s", err)
}
// If no error, we try to parse the response
var displays []Display
err = json.Unmarshal(res.Body, &displays)
if err != nil {
return nil, fmt.Errorf("Failed to parse JSON response, error: %s", err)
}
// Set socketURL on all display structures
for i := range displays {
displays[i].socketURL = socketURL
}
return displays, nil
}