/
swift.go
330 lines (265 loc) · 8.32 KB
/
swift.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
package swift
import (
"context"
"fmt"
"io"
"net/http"
"path"
"strconv"
"strings"
"time"
"github.com/restic/restic/internal/backend"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/restic"
"github.com/cenkalti/backoff/v4"
"github.com/ncw/swift"
)
// beSwift is a backend which stores the data on a swift endpoint.
type beSwift struct {
conn *swift.Connection
sem *backend.Semaphore
container string // Container name
prefix string // Prefix of object names in the container
backend.Layout
}
// ensure statically that *beSwift implements restic.Backend.
var _ restic.Backend = &beSwift{}
// Open opens the swift backend at a container in region. The container is
// created if it does not exist yet.
func Open(cfg Config, rt http.RoundTripper) (restic.Backend, error) {
debug.Log("config %#v", cfg)
sem, err := backend.NewSemaphore(cfg.Connections)
if err != nil {
return nil, err
}
be := &beSwift{
conn: &swift.Connection{
UserName: cfg.UserName,
UserId: cfg.UserID,
Domain: cfg.Domain,
DomainId: cfg.DomainID,
ApiKey: cfg.APIKey,
AuthUrl: cfg.AuthURL,
Region: cfg.Region,
Tenant: cfg.Tenant,
TenantId: cfg.TenantID,
TenantDomain: cfg.TenantDomain,
TenantDomainId: cfg.TenantDomainID,
TrustId: cfg.TrustID,
StorageUrl: cfg.StorageURL,
AuthToken: cfg.AuthToken,
ApplicationCredentialId: cfg.ApplicationCredentialID,
ApplicationCredentialName: cfg.ApplicationCredentialName,
ApplicationCredentialSecret: cfg.ApplicationCredentialSecret,
ConnectTimeout: time.Minute,
Timeout: time.Minute,
Transport: rt,
},
sem: sem,
container: cfg.Container,
prefix: cfg.Prefix,
Layout: &backend.DefaultLayout{
Path: cfg.Prefix,
Join: path.Join,
},
}
// Authenticate if needed
if !be.conn.Authenticated() {
if err := be.conn.Authenticate(); err != nil {
return nil, errors.Wrap(err, "conn.Authenticate")
}
}
// Ensure container exists
switch _, _, err := be.conn.Container(be.container); err {
case nil:
// Container exists
case swift.ContainerNotFound:
err = be.createContainer(cfg.DefaultContainerPolicy)
if err != nil {
return nil, errors.Wrap(err, "beSwift.createContainer")
}
default:
return nil, errors.Wrap(err, "conn.Container")
}
return be, nil
}
func (be *beSwift) createContainer(policy string) error {
var h swift.Headers
if policy != "" {
h = swift.Headers{
"X-Storage-Policy": policy,
}
}
return be.conn.ContainerCreate(be.container, h)
}
// Location returns this backend's location (the container name).
func (be *beSwift) Location() string {
return be.container
}
// Load runs fn with a reader that yields the contents of the file at h at the
// given offset.
func (be *beSwift) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
return backend.DefaultLoad(ctx, h, length, offset, be.openReader, fn)
}
func (be *beSwift) openReader(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
debug.Log("Load %v, length %v, offset %v", h, length, offset)
if err := h.Valid(); err != nil {
return nil, backoff.Permanent(err)
}
if offset < 0 {
return nil, errors.New("offset is negative")
}
if length < 0 {
return nil, errors.Errorf("invalid length %d", length)
}
objName := be.Filename(h)
headers := swift.Headers{}
if offset > 0 {
headers["Range"] = fmt.Sprintf("bytes=%d-", offset)
}
if length > 0 {
headers["Range"] = fmt.Sprintf("bytes=%d-%d", offset, offset+int64(length)-1)
}
if _, ok := headers["Range"]; ok {
debug.Log("Load(%v) send range %v", h, headers["Range"])
}
be.sem.GetToken()
obj, _, err := be.conn.ObjectOpen(be.container, objName, false, headers)
if err != nil {
debug.Log(" err %v", err)
be.sem.ReleaseToken()
return nil, errors.Wrap(err, "conn.ObjectOpen")
}
return be.sem.ReleaseTokenOnClose(obj, nil), nil
}
// Save stores data in the backend at the handle.
func (be *beSwift) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
if err := h.Valid(); err != nil {
return backoff.Permanent(err)
}
objName := be.Filename(h)
debug.Log("Save %v at %v", h, objName)
be.sem.GetToken()
defer be.sem.ReleaseToken()
encoding := "binary/octet-stream"
debug.Log("PutObject(%v, %v, %v)", be.container, objName, encoding)
hdr := swift.Headers{"Content-Length": strconv.FormatInt(rd.Length(), 10)}
_, err := be.conn.ObjectPut(be.container, objName, rd, true, "", encoding, hdr)
// swift does not return the upload length
debug.Log("%v, err %#v", objName, err)
return errors.Wrap(err, "client.PutObject")
}
// Stat returns information about a blob.
func (be *beSwift) Stat(ctx context.Context, h restic.Handle) (bi restic.FileInfo, err error) {
debug.Log("%v", h)
objName := be.Filename(h)
be.sem.GetToken()
defer be.sem.ReleaseToken()
obj, _, err := be.conn.Object(be.container, objName)
if err != nil {
debug.Log("Object() err %v", err)
return restic.FileInfo{}, errors.Wrap(err, "conn.Object")
}
return restic.FileInfo{Size: obj.Bytes, Name: h.Name}, nil
}
// Test returns true if a blob of the given type and name exists in the backend.
func (be *beSwift) Test(ctx context.Context, h restic.Handle) (bool, error) {
objName := be.Filename(h)
be.sem.GetToken()
defer be.sem.ReleaseToken()
switch _, _, err := be.conn.Object(be.container, objName); err {
case nil:
return true, nil
case swift.ObjectNotFound:
return false, nil
default:
return false, errors.Wrap(err, "conn.Object")
}
}
// Remove removes the blob with the given name and type.
func (be *beSwift) Remove(ctx context.Context, h restic.Handle) error {
objName := be.Filename(h)
be.sem.GetToken()
defer be.sem.ReleaseToken()
err := be.conn.ObjectDelete(be.container, objName)
debug.Log("Remove(%v) -> err %v", h, err)
return errors.Wrap(err, "conn.ObjectDelete")
}
// List runs fn for each file in the backend which has the type t. When an
// error occurs (or fn returns an error), List stops and returns it.
func (be *beSwift) List(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
debug.Log("listing %v", t)
prefix, _ := be.Basedir(t)
prefix += "/"
err := be.conn.ObjectsWalk(be.container, &swift.ObjectsOpts{Prefix: prefix},
func(opts *swift.ObjectsOpts) (interface{}, error) {
be.sem.GetToken()
newObjects, err := be.conn.Objects(be.container, opts)
be.sem.ReleaseToken()
if err != nil {
return nil, errors.Wrap(err, "conn.ObjectNames")
}
for _, obj := range newObjects {
m := path.Base(strings.TrimPrefix(obj.Name, prefix))
if m == "" {
continue
}
fi := restic.FileInfo{
Name: m,
Size: obj.Bytes,
}
if ctx.Err() != nil {
return nil, ctx.Err()
}
err := fn(fi)
if err != nil {
return nil, err
}
if ctx.Err() != nil {
return nil, ctx.Err()
}
}
return newObjects, nil
})
if err != nil {
return err
}
return ctx.Err()
}
// Remove keys for a specified backend type.
func (be *beSwift) removeKeys(ctx context.Context, t restic.FileType) error {
return be.List(ctx, t, func(fi restic.FileInfo) error {
return be.Remove(ctx, restic.Handle{Type: t, Name: fi.Name})
})
}
// IsNotExist returns true if the error is caused by a not existing file.
func (be *beSwift) IsNotExist(err error) bool {
if e, ok := errors.Cause(err).(*swift.Error); ok {
return e.StatusCode == http.StatusNotFound
}
return false
}
// Delete removes all restic objects in the container.
// It will not remove the container itself.
func (be *beSwift) Delete(ctx context.Context) error {
alltypes := []restic.FileType{
restic.PackFile,
restic.KeyFile,
restic.LockFile,
restic.SnapshotFile,
restic.IndexFile}
for _, t := range alltypes {
err := be.removeKeys(ctx, t)
if err != nil {
return nil
}
}
err := be.Remove(ctx, restic.Handle{Type: restic.ConfigFile})
if err != nil && !be.IsNotExist(err) {
return err
}
return nil
}
// Close does nothing
func (be *beSwift) Close() error { return nil }