forked from distribution/distribution
-
Notifications
You must be signed in to change notification settings - Fork 0
/
blobupload.go
337 lines (282 loc) · 10.8 KB
/
blobupload.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
331
332
333
334
335
336
337
package handlers
import (
"fmt"
"net/http"
"net/url"
"os"
"github.com/docker/distribution"
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/api/v2"
"github.com/gorilla/handlers"
)
// blobUploadDispatcher constructs and returns the blob upload handler for the
// given request context.
func blobUploadDispatcher(ctx *Context, r *http.Request) http.Handler {
buh := &blobUploadHandler{
Context: ctx,
UUID: getUploadUUID(ctx),
}
handler := handlers.MethodHandler{
"GET": http.HandlerFunc(buh.GetUploadStatus),
"HEAD": http.HandlerFunc(buh.GetUploadStatus),
}
if !ctx.readOnly {
handler["POST"] = http.HandlerFunc(buh.StartBlobUpload)
handler["PATCH"] = http.HandlerFunc(buh.PatchBlobData)
handler["PUT"] = http.HandlerFunc(buh.PutBlobUploadComplete)
handler["DELETE"] = http.HandlerFunc(buh.CancelBlobUpload)
}
if buh.UUID != "" {
state, err := hmacKey(ctx.Config.HTTP.Secret).unpackUploadState(r.FormValue("_state"))
if err != nil {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctxu.GetLogger(ctx).Infof("error resolving upload: %v", err)
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
})
}
buh.State = state
if state.Name != ctx.Repository.Name() {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctxu.GetLogger(ctx).Infof("mismatched repository name in upload state: %q != %q", state.Name, buh.Repository.Name())
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
})
}
if state.UUID != buh.UUID {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctxu.GetLogger(ctx).Infof("mismatched uuid in upload state: %q != %q", state.UUID, buh.UUID)
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
})
}
blobs := ctx.Repository.Blobs(buh)
upload, err := blobs.Resume(buh, buh.UUID)
if err != nil {
ctxu.GetLogger(ctx).Errorf("error resolving upload: %v", err)
if err == distribution.ErrBlobUploadUnknown {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadUnknown.WithDetail(err))
})
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
})
}
buh.Upload = upload
if state.Offset > 0 {
// Seek the blob upload to the correct spot if it's non-zero.
// These error conditions should be rare and demonstrate really
// problems. We basically cancel the upload and tell the client to
// start over.
if nn, err := upload.Seek(buh.State.Offset, os.SEEK_SET); err != nil {
defer upload.Close()
ctxu.GetLogger(ctx).Infof("error seeking blob upload: %v", err)
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
upload.Cancel(buh)
})
} else if nn != buh.State.Offset {
defer upload.Close()
ctxu.GetLogger(ctx).Infof("seek to wrong offest: %d != %d", nn, buh.State.Offset)
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
upload.Cancel(buh)
})
}
}
return closeResources(handler, buh.Upload)
}
return handler
}
// blobUploadHandler handles the http blob upload process.
type blobUploadHandler struct {
*Context
// UUID identifies the upload instance for the current request. Using UUID
// to key blob writers since this implementation uses UUIDs.
UUID string
Upload distribution.BlobWriter
State blobUploadState
}
// StartBlobUpload begins the blob upload process and allocates a server-side
// blob writer session.
func (buh *blobUploadHandler) StartBlobUpload(w http.ResponseWriter, r *http.Request) {
blobs := buh.Repository.Blobs(buh)
upload, err := blobs.Create(buh)
if err != nil {
if err == distribution.ErrUnsupported {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnsupported)
} else {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
return
}
buh.Upload = upload
defer buh.Upload.Close()
if err := buh.blobUploadResponse(w, r, true); err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
w.Header().Set("Docker-Upload-UUID", buh.Upload.ID())
w.WriteHeader(http.StatusAccepted)
}
// GetUploadStatus returns the status of a given upload, identified by id.
func (buh *blobUploadHandler) GetUploadStatus(w http.ResponseWriter, r *http.Request) {
if buh.Upload == nil {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadUnknown)
return
}
// TODO(dmcgowan): Set last argument to false in blobUploadResponse when
// resumable upload is supported. This will enable returning a non-zero
// range for clients to begin uploading at an offset.
if err := buh.blobUploadResponse(w, r, true); err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
w.Header().Set("Docker-Upload-UUID", buh.UUID)
w.WriteHeader(http.StatusNoContent)
}
// PatchBlobData writes data to an upload.
func (buh *blobUploadHandler) PatchBlobData(w http.ResponseWriter, r *http.Request) {
if buh.Upload == nil {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadUnknown)
return
}
ct := r.Header.Get("Content-Type")
if ct != "" && ct != "application/octet-stream" {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(fmt.Errorf("Bad Content-Type")))
// TODO(dmcgowan): encode error
return
}
// TODO(dmcgowan): support Content-Range header to seek and write range
if err := copyFullPayload(w, r, buh.Upload, buh, "blob PATCH", &buh.Errors); err != nil {
// copyFullPayload reports the error if necessary
return
}
if err := buh.blobUploadResponse(w, r, false); err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
w.WriteHeader(http.StatusAccepted)
}
// PutBlobUploadComplete takes the final request of a blob upload. The
// request may include all the blob data or no blob data. Any data
// provided is received and verified. If successful, the blob is linked
// into the blob store and 201 Created is returned with the canonical
// url of the blob.
func (buh *blobUploadHandler) PutBlobUploadComplete(w http.ResponseWriter, r *http.Request) {
if buh.Upload == nil {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadUnknown)
return
}
dgstStr := r.FormValue("digest") // TODO(stevvooe): Support multiple digest parameters!
if dgstStr == "" {
// no digest? return error, but allow retry.
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail("digest missing"))
return
}
dgst, err := digest.ParseDigest(dgstStr)
if err != nil {
// no digest? return error, but allow retry.
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail("digest parsing failed"))
return
}
if err := copyFullPayload(w, r, buh.Upload, buh, "blob PUT", &buh.Errors); err != nil {
// copyFullPayload reports the error if necessary
return
}
desc, err := buh.Upload.Commit(buh, distribution.Descriptor{
Digest: dgst,
// TODO(stevvooe): This isn't wildly important yet, but we should
// really set the length and mediatype. For now, we can let the
// backend take care of this.
})
if err != nil {
switch err := err.(type) {
case distribution.ErrBlobInvalidDigest:
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
default:
switch err {
case distribution.ErrUnsupported:
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnsupported)
case distribution.ErrBlobInvalidLength, distribution.ErrBlobDigestUnsupported:
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadInvalid.WithDetail(err))
default:
ctxu.GetLogger(buh).Errorf("unknown error completing upload: %#v", err)
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
}
// Clean up the backend blob data if there was an error.
if err := buh.Upload.Cancel(buh); err != nil {
// If the cleanup fails, all we can do is observe and report.
ctxu.GetLogger(buh).Errorf("error canceling upload after error: %v", err)
}
return
}
// Build our canonical blob url
blobURL, err := buh.urlBuilder.BuildBlobURL(buh.Repository.Name(), desc.Digest)
if err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
w.Header().Set("Location", blobURL)
w.Header().Set("Content-Length", "0")
w.Header().Set("Docker-Content-Digest", desc.Digest.String())
w.WriteHeader(http.StatusCreated)
}
// CancelBlobUpload cancels an in-progress upload of a blob.
func (buh *blobUploadHandler) CancelBlobUpload(w http.ResponseWriter, r *http.Request) {
if buh.Upload == nil {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUploadUnknown)
return
}
w.Header().Set("Docker-Upload-UUID", buh.UUID)
if err := buh.Upload.Cancel(buh); err != nil {
ctxu.GetLogger(buh).Errorf("error encountered canceling upload: %v", err)
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
w.WriteHeader(http.StatusNoContent)
}
// blobUploadResponse provides a standard request for uploading blobs and
// chunk responses. This sets the correct headers but the response status is
// left to the caller. The fresh argument is used to ensure that new blob
// uploads always start at a 0 offset. This allows disabling resumable push by
// always returning a 0 offset on check status.
func (buh *blobUploadHandler) blobUploadResponse(w http.ResponseWriter, r *http.Request, fresh bool) error {
var offset int64
if !fresh {
var err error
offset, err = buh.Upload.Seek(0, os.SEEK_CUR)
if err != nil {
ctxu.GetLogger(buh).Errorf("unable get current offset of blob upload: %v", err)
return err
}
}
// TODO(stevvooe): Need a better way to manage the upload state automatically.
buh.State.Name = buh.Repository.Name()
buh.State.UUID = buh.Upload.ID()
buh.State.Offset = offset
buh.State.StartedAt = buh.Upload.StartedAt()
token, err := hmacKey(buh.Config.HTTP.Secret).packUploadState(buh.State)
if err != nil {
ctxu.GetLogger(buh).Infof("error building upload state token: %s", err)
return err
}
uploadURL, err := buh.urlBuilder.BuildBlobUploadChunkURL(
buh.Repository.Name(), buh.Upload.ID(),
url.Values{
"_state": []string{token},
})
if err != nil {
ctxu.GetLogger(buh).Infof("error building upload url: %s", err)
return err
}
endRange := offset
if endRange > 0 {
endRange = endRange - 1
}
w.Header().Set("Docker-Upload-UUID", buh.UUID)
w.Header().Set("Location", uploadURL)
w.Header().Set("Content-Length", "0")
w.Header().Set("Range", fmt.Sprintf("0-%d", endRange))
return nil
}