func (s *SourceIndex) Fetch(out io.Writer) (string, error) {
tmp, err := ioutil.TempDir("", "")
if err != nil {
return "", err
}
r, err := urlReader(s.URL)
if err != nil {
return "", err
}
defer r.Close()
data, err := ioutil.ReadAll(r)
if err != nil {
return "", err
}
var index structs.Index
if err := json.Unmarshal(data, &index); err != nil {
return "", err
}
if err := provider.FromEnv().IndexDownload(&index, tmp); err != nil {
return "", err
}
return tmp, nil
}
// Provider returns the appropriate provider interface based on the env
func Provider() provider.Provider {
if os.Getenv("PROVIDER") == "test" {
return TestProvider
}
return provider.FromEnv()
}
func init() {
currentProvider = provider.FromEnv()
var buf bytes.Buffer
currentProvider.Initialize(structs.ProviderOptions{
LogOutput: &buf,
})
}
func urlReader(url_ string) (io.ReadCloser, error) {
u, err := url.Parse(url_)
if err != nil {
return nil, err
}
switch u.Scheme {
case "file":
fd, err := os.Open(u.Path)
if err != nil {
return nil, err
}
return fd, nil
case "object":
return provider.FromEnv().ObjectFetch(u.Path)
}
req, err := http.Get(url_)
if err != nil {
return nil, err
}
return req.Body, nil
}