/
openstack.go
183 lines (156 loc) · 4.8 KB
/
openstack.go
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package storage
import (
"bytes"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net/http"
pathutil "path"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
osObjects "github.com/gophercloud/gophercloud/openstack/objectstorage/v1/objects"
"github.com/gophercloud/gophercloud/pagination"
)
// ReauthRoundTripper satisfies the http.RoundTripper interface and is used to
// limit the number of re-auth attempts (infinite by default)
type ReauthRoundTripper struct {
rt http.RoundTripper
numReauthAttempts int
}
// RoundTrip performs a round-trip HTTP request and logs relevant information about it.
func (rrt *ReauthRoundTripper) RoundTrip(request *http.Request) (*http.Response, error) {
response, err := rrt.rt.RoundTrip(request)
if response == nil {
return nil, err
}
if response.StatusCode == http.StatusUnauthorized {
if rrt.numReauthAttempts == 3 {
return response, errors.New("tried to re-authenticate 3 times with no success")
}
rrt.numReauthAttempts++
}
return response, nil
}
// OpenstackOSBackend is a storage backend for Openstack Object Storage
type OpenstackOSBackend struct {
Container string
Prefix string
Region string
CACert string
Client *gophercloud.ServiceClient
}
// NewOpenstackOSBackend creates a new instance of OpenstackOSBackend
func NewOpenstackOSBackend(container string, prefix string, region string, caCert string) *OpenstackOSBackend {
authOptions, err := openstack.AuthOptionsFromEnv()
if err != nil {
panic(fmt.Sprintf("Openstack (environment): %s", err))
}
authOptions.AllowReauth = true
// Create a custom HTTP client to handle reauth retry and custom CACERT if needed
roundTripper := ReauthRoundTripper{}
if caCert != "" {
caCert, err := ioutil.ReadFile(caCert)
if err != nil {
panic(fmt.Sprintf("Openstack (ca certificates): %s", err))
}
caCertPool := x509.NewCertPool()
if !caCertPool.AppendCertsFromPEM(caCert) {
panic(fmt.Sprintf("Openstack (ca certificates): unable to read certificate bundle"))
}
transport := &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: caCertPool,
},
}
roundTripper.rt = transport
} else {
roundTripper.rt = http.DefaultTransport
}
provider, err := openstack.NewClient(authOptions.IdentityEndpoint)
if err != nil {
panic(fmt.Sprintf("Openstack (client): %s", err))
}
provider.HTTPClient = http.Client{
Transport: &roundTripper,
}
err = openstack.Authenticate(provider, authOptions)
if err != nil {
panic(fmt.Sprintf("Openstack (authenticate): %s", err))
}
client, err := openstack.NewObjectStorageV1(provider, gophercloud.EndpointOpts{
Region: region,
})
if err != nil {
panic(fmt.Sprintf("Openstack (object storage): %s", err))
}
b := &OpenstackOSBackend{
Container: container,
Prefix: prefix,
Region: region,
Client: client,
}
return b
}
// ListObjects lists all objects in an Openstack container, at prefix
func (b OpenstackOSBackend) ListObjects(prefix string) ([]Object, error) {
var objects []Object
prefix = pathutil.Join(b.Prefix, prefix)
opts := &osObjects.ListOpts{
Full: true,
Prefix: prefix,
}
pager := osObjects.List(b.Client, b.Container, opts)
err := pager.EachPage(func(page pagination.Page) (bool, error) {
objectList, err := osObjects.ExtractInfo(page)
if err != nil {
return false, err
}
for _, openStackObject := range objectList {
path := removePrefixFromObjectPath(prefix, openStackObject.Name)
if objectPathIsInvalid(path) {
continue
}
object := Object{
Path: path,
Content: []byte{},
LastModified: openStackObject.LastModified,
}
objects = append(objects, object)
}
return true, nil
})
return objects, err
}
// GetObject retrieves an object from an Openstack container, at prefix
func (b OpenstackOSBackend) GetObject(path string) (Object, error) {
var object Object
object.Path = path
result := osObjects.Download(b.Client, b.Container, pathutil.Join(b.Prefix, path), nil)
headers, err := result.Extract()
if err != nil {
return object, err
}
object.LastModified = headers.LastModified
content, err := result.ExtractContent()
if err != nil {
return object, err
}
object.Content = content
return object, nil
}
// PutObject uploads an object to Openstack container, at prefix
func (b OpenstackOSBackend) PutObject(path string, content []byte) error {
reader := bytes.NewReader(content)
createOpts := osObjects.CreateOpts{
Content: reader,
}
_, err := osObjects.Create(b.Client, b.Container, pathutil.Join(b.Prefix, path), createOpts).Extract()
return err
}
// DeleteObject removes an object from an Openstack container, at prefix
func (b OpenstackOSBackend) DeleteObject(path string) error {
_, err := osObjects.Delete(b.Client, b.Container, pathutil.Join(b.Prefix, path), nil).Extract()
return err
}