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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package local
import (
"fmt"
"io"
"io/ioutil"
"launchpad.net/juju-core/environs"
"launchpad.net/juju-core/errors"
"net/http"
"sort"
"strings"
)
// storage implements the environs.Storage interface.
type storage struct {
baseURL string
}
var _ environs.Storage = (*storage)(nil)
// newStorage returns a new local storage.
func newStorage(address string, port int) *storage {
return &storage{
baseURL: fmt.Sprintf("http://%s:%d", address, port),
}
}
// Get opens the given storage file and returns a ReadCloser
// that can be used to read its contents. It is the caller's
// responsibility to close it after use. If the name does not
// exist, it should return a *NotFoundError.
func (s *storage) Get(name string) (io.ReadCloser, error) {
url, err := s.URL(name)
if err != nil {
return nil, err
}
resp, err := http.Get(url)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, errors.NotFoundf("file %q not found", name)
}
return resp.Body, nil
}
// List lists all names in the storage with the given prefix, in
// alphabetical order. The names in the storage are considered
// to be in a flat namespace, so the prefix may include slashes
// and the names returned are the full names for the matching
// entries.
func (s *storage) List(prefix string) ([]string, error) {
url, err := s.URL(prefix)
if err != nil {
return nil, err
}
resp, err := http.Get(url + "*")
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("%d %s", resp.StatusCode, resp.Status)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if len(body) == 0 {
return nil, nil
}
names := strings.Split(string(body), "\n")
sort.Strings(names)
return names, nil
}
// URL returns an URL that can be used to access the given storage file.
func (s *storage) URL(name string) (string, error) {
return fmt.Sprintf("%s/%s", s.baseURL, name), nil
}
// Put reads from r and writes to the given storage file.
// The length must be set to the total length of the file.
func (s *storage) Put(name string, r io.Reader, length int64) error {
url, err := s.URL(name)
if err != nil {
return err
}
req, err := http.NewRequest("PUT", url, r)
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/octet-stream")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
if resp.StatusCode != 201 {
return fmt.Errorf("%d %s", resp.StatusCode, resp.Status)
}
return nil
}
// Remove removes the given file from the environment's
// storage. It should not return an error if the file does
// not exist.
func (s *storage) Remove(name string) error {
url, err := s.URL(name)
if err != nil {
return err
}
req, err := http.NewRequest("DELETE", url, nil)
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
if resp.StatusCode != 200 {
return fmt.Errorf("%d %s", resp.StatusCode, resp.Status)
}
return nil
}
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