func (app *App) GetRemoteDescriptor() (remoteDescriptor descriptors.AppDescriptor) {
if app.remoteDescriptorCached {
return app.remoteDescriptor
}
app.remoteDescriptorCached = true
bootDescriptor := app.bootDescriptor
localDescriptor := app.GetLocalDescriptor()
var remoteDescriptorURL *url.URL
var err error
if localDescriptor != nil {
if localDescriptor.IsSkipUpdateCheck() {
log.Notice("Skipping update check, as requested by the local descriptor")
return nil
}
remoteDescriptorURL, err = localDescriptor.GetRemoteFileURL(localDescriptor.GetDescriptorFileName())
} else {
remoteDescriptorURL, err = bootDescriptor.GetRemoteFileURL(bootDescriptor.GetDescriptorFileName())
}
if err != nil {
log.Warning(err.Error())
return nil
}
log.Notice("The remote descriptor's URL is: %v", remoteDescriptorURL)
log.Info("Retrieving the remote descriptor...")
remoteDescriptorBytes, err := caravel.RetrieveFromURL(remoteDescriptorURL)
if err != nil {
log.Warning(err.Error())
return nil
}
log.Notice("Remote descriptor retrieved")
log.Info("Opening the remote descriptor...")
remoteDescriptor, err = descriptors.NewAppDescriptorFromBytes(remoteDescriptorBytes)
if err != nil {
log.Warning(err.Error())
return nil
}
log.Notice("Remote descriptor ready")
log.Debug("The remote descriptor is: %#v", remoteDescriptor)
app.remoteDescriptor = remoteDescriptor
return remoteDescriptor
}
func GetGitHubDescriptorInfo(baseURL *url.URL, descriptorFileName string) *GitHubDescriptorInfo {
projectParams := latestVersionURLRegex.FindStringSubmatch(baseURL.String())
if projectParams == nil {
log.Debug("The URL does not reference a 'latest' release on GitHub")
return nil
}
log.Debug("The URL references a 'latest' release on GitHub")
gitHubUser := projectParams[1]
gitHubRepo := projectParams[2]
apiLatestVersionURL, err := url.Parse(fmt.Sprintf(
apiLatestVersionURLTemplate,
gitHubUser,
gitHubRepo))
if err != nil {
log.Warning(err.Error())
return nil
}
log.Debug("Calling GitHub's API, at '%v'...", apiLatestVersionURL)
apiResponseBytes, err := caravel.RetrieveFromURL(apiLatestVersionURL)
if err != nil {
log.Warning(err.Error())
return nil
}
log.Debug("API returned OK")
log.Debug("Deserializing the API response...")
var latestVersionResponse latestVersionResponse
err = json.Unmarshal(apiResponseBytes, &latestVersionResponse)
if err != nil {
log.Warning(err.Error())
return nil
}
log.Debug("Response correctly deserialized: %#v", latestVersionResponse)
log.Debug("Now processing the response fields...")
result := &GitHubDescriptorInfo{}
for _, asset := range latestVersionResponse.Assets {
if asset.Name == descriptorFileName {
result.DescriptorURL, err = url.Parse(asset.BrowserDownloadURL)
if err != nil {
log.Warning("Error while parsing the BrowserDownloadURL: %v", err.Error())
return nil
}
break
}
}
if result.DescriptorURL == nil {
log.Warning("The app descriptor ('%v') could not be found as an asset of the latest release", descriptorFileName)
return nil
}
tagComponents := tagRegex.FindStringSubmatch(latestVersionResponse.TagName)
if tagComponents == nil {
log.Warning("GitHub's release tag must be in the format: <any string, even empty><VERSION>, not '%v'", latestVersionResponse.TagName)
return nil
}
result.Version, err = versioning.ParseVersion(tagComponents[1])
if err != nil {
log.Warning("Error while parsing the version: %v", err.Error())
return nil
}
log.Notice("Response fields correctly processed")
return result
}
