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|
package objects
import (
"bufio"
"crypto/md5"
"encoding/json"
"fmt"
"io"
"os"
"strings"
"time"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack/objectstorage/v1/objects"
)
// Manifest represents an object manifest.
type Manifest struct {
Bytes int64 `json:"bytes"`
ContentType string `json:"content_type"`
Hash string `json:"hash"`
Name string `json:"name"`
LastModified time.Time `json:"-"`
}
func (r *Manifest) UnmarshalJSON(b []byte) error {
type tmp Manifest
var s struct {
tmp
LastModified gophercloud.JSONRFC3339MilliNoZ `json:"last_modified"`
}
err := json.Unmarshal(b, &s)
if err != nil {
return err
}
*r = Manifest(s.tmp)
r.LastModified = time.Time(s.LastModified)
return nil
}
// ExtractMultipartManifest will extract a manifest returned when
// downloading an object using DownloadOpts.MultipartManifest = "get".
func ExtractMultipartManifest(body []byte) ([]Manifest, error) {
var s []Manifest
err := json.Unmarshal(body, &s)
return s, err
}
type GetManifestOpts struct {
ContainerName string
ContentLength int64
ETag string
ObjectManifest string
ObjectName string
Manifest string
StaticLargeObject bool
}
// https://github.com/openstack/python-swiftclient/blob/e65070964c7b1e04119c87e5f344d39358780d18/swiftclient/service.py#L1916
func GetManifest(client *gophercloud.ServiceClient, opts GetManifestOpts) ([]Manifest, error) {
var manifest []Manifest
// TODO: test this
if opts.ObjectManifest != "" {
v := strings.SplitN(opts.ObjectManifest, "/", 2)
if len(v) != 2 {
return nil, fmt.Errorf("unable to parse object manifest %s", opts.ObjectManifest)
}
sContainer := v[0]
sPrefix := v[1]
listOpts := objects.ListOpts{
Prefix: sPrefix,
}
allPages, err := objects.List(client, sContainer, listOpts).AllPages()
if err != nil {
return nil, fmt.Errorf("unable to list %s: %s", sContainer, err)
}
allObjects, err := objects.ExtractNames(allPages)
if err != nil {
return nil, fmt.Errorf("unable to extract objects from %s: %s", sContainer, err)
}
for _, obj := range allObjects {
objInfo, err := objects.Get(client, sContainer, obj, nil).Extract()
if err != nil {
return nil, fmt.Errorf("unable to get object %s:%s: %s", sContainer, obj, err)
}
m := Manifest{
Bytes: objInfo.ContentLength,
ContentType: objInfo.ContentType,
Hash: objInfo.ETag,
LastModified: objInfo.LastModified,
Name: obj,
}
manifest = append(manifest, m)
}
return manifest, nil
}
if opts.StaticLargeObject {
if opts.Manifest == "" {
downloadOpts := objects.DownloadOpts{
MultipartManifest: "get",
}
res := objects.Download(client, opts.ContainerName, opts.ObjectName, downloadOpts)
if res.Err != nil {
return nil, res.Err
}
body, err := res.ExtractContent()
if err != nil {
return nil, err
}
multipartManifest, err := ExtractMultipartManifest(body)
if err != nil {
return nil, err
}
for _, obj := range multipartManifest {
// TODO: support sub_slo
m := Manifest{
Bytes: obj.Bytes,
ContentType: obj.ContentType,
Hash: obj.Hash,
LastModified: obj.LastModified,
Name: obj.Name,
}
manifest = append(manifest, m)
}
}
return manifest, nil
}
m := Manifest{
Hash: opts.ETag,
Bytes: opts.ContentLength,
}
manifest = append(manifest, m)
return manifest, nil
}
func IsIdentical(manifest []Manifest, path string) (bool, error) {
if path == "" {
return false, nil
}
f, err := os.Open(path)
if err != nil {
return false, err
}
defer f.Close()
reader := bufio.NewReader(f)
for _, data := range manifest {
hash := md5.New()
buf := make([]byte, data.Bytes)
n, err := reader.Read(buf)
if err != nil && err != io.EOF {
return false, err
}
hash.Write(buf[:n])
checksum := fmt.Sprintf("%x", hash.Sum(nil))
if checksum != data.Hash {
return false, nil
}
}
// Do one last read to see if the end of file was reached.
buf := make([]byte, 1)
_, err = reader.Read(buf)
if err == io.EOF {
return true, nil
}
return false, nil
}
|
