-
Notifications
You must be signed in to change notification settings - Fork 382
/
rclone_storage.go
315 lines (247 loc) · 8.04 KB
/
rclone_storage.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
// Package rclone implements blob storage provider proxied by rclone (http://rclone.org)
package rclone
import (
"bufio"
"context"
"crypto/sha256"
"encoding/hex"
"os"
"os/exec"
"path/filepath"
"strings"
"sync/atomic"
"time"
"github.com/foomo/htpasswd"
"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/kopia/kopia/internal/tlsutil"
"github.com/kopia/kopia/repo/blob"
"github.com/kopia/kopia/repo/blob/webdav"
"github.com/kopia/kopia/repo/logging"
)
const (
rcloneStorageType = "rclone"
defaultRCloneExe = "rclone"
// rcloneStartupTimeout is the time we wait for rclone to print the https address it's serving at.
rcloneStartupTimeout = 15 * time.Second
)
var log = logging.Module("rclone")
type rcloneStorage struct {
blob.Storage // the underlying WebDAV storage used to implement all methods.
Options
cmd *exec.Cmd // running rclone
temporaryDir string
allTransfersComplete *int32 // set to 1 when rclone process emits "Transferred:*100%"
changeCount *int32 // set to 1 when we had any writes
}
func (r *rcloneStorage) PutBlob(ctx context.Context, b blob.ID, data blob.Bytes, opts blob.PutOptions) error {
err := r.Storage.PutBlob(ctx, b, data, opts)
if err == nil {
atomic.StoreInt32(r.changeCount, 1)
return nil
}
return errors.Wrap(err, "error writing blob using WebDAV")
}
func (r *rcloneStorage) ConnectionInfo() blob.ConnectionInfo {
return blob.ConnectionInfo{
Type: rcloneStorageType,
Config: &r.Options,
}
}
func (r *rcloneStorage) waitForTransfersToEnd(ctx context.Context) {
if atomic.LoadInt32(r.changeCount) == 0 {
log(ctx).Debugf("no writes in this session, no need to wait")
return
}
log(ctx).Debugf("waiting for background rclone transfers to complete...")
for atomic.LoadInt32(r.allTransfersComplete) == 0 {
log(ctx).Debugf("still waiting for background rclone transfers to complete...")
time.Sleep(1 * time.Second)
}
log(ctx).Debugf("all background rclone transfers have completed.")
}
func (r *rcloneStorage) Close(ctx context.Context) error {
if !r.Options.NoWaitForTransfers {
r.waitForTransfersToEnd(ctx)
}
if r.Storage != nil {
if err := r.Storage.Close(ctx); err != nil {
return errors.Wrap(err, "error closing webdav connection")
}
}
// this will kill rclone process if any
if r.cmd != nil && r.cmd.Process != nil {
log(ctx).Debugf("killing rclone")
r.cmd.Process.Kill() // nolint:errcheck
r.cmd.Wait() // nolint:errcheck
}
if r.temporaryDir != "" {
if err := os.RemoveAll(r.temporaryDir); err != nil && !os.IsNotExist(err) {
log(ctx).Errorf("error deleting temporary dir: %v", err)
}
}
return nil
}
func (r *rcloneStorage) DisplayName() string {
return "RClone " + r.Options.RemotePath
}
func (r *rcloneStorage) processStderrStatus(ctx context.Context, statsMarker string, s *bufio.Scanner) {
for s.Scan() {
l := s.Text()
if r.Debug {
log(ctx).Debugf("[RCLONE] %v", l)
}
if strings.Contains(l, statsMarker) {
if strings.Contains(l, " 100%,") || strings.Contains(l, ", -,") {
atomic.StoreInt32(r.allTransfersComplete, 1)
} else {
atomic.StoreInt32(r.allTransfersComplete, 0)
}
}
}
}
func (r *rcloneStorage) runRCloneAndWaitForServerAddress(ctx context.Context, c *exec.Cmd, statsMarker string, startupTimeout time.Duration) (string, error) {
rcloneAddressChan := make(chan string)
rcloneErrChan := make(chan error)
log(ctx).Debugf("starting %v", c.Path)
go func() {
stderr, err := c.StderrPipe()
if err != nil {
rcloneErrChan <- err
return
}
if err := c.Start(); err != nil {
rcloneErrChan <- err
return
}
go func() {
s := bufio.NewScanner(stderr)
var lastOutput string
for s.Scan() {
l := s.Text()
lastOutput = l
if p := strings.Index(l, "https://"); p >= 0 {
rcloneAddressChan <- l[p:]
go r.processStderrStatus(ctx, statsMarker, s)
return
}
}
select {
case rcloneErrChan <- errors.Errorf("rclone server failed to start: %v", lastOutput):
default:
}
}()
}()
select {
case addr := <-rcloneAddressChan:
return addr, nil
case err := <-rcloneErrChan:
return "", err
case <-time.After(startupTimeout):
return "", errors.Errorf("timed out waiting for rclone to start")
}
}
// New creates new RClone storage with specified options.
// nolint:funlen
func New(ctx context.Context, opt *Options, isCreate bool) (blob.Storage, error) {
// generate directory for all temp files.
td, err := os.MkdirTemp("", "kopia-rclone")
if err != nil {
return nil, errors.Wrap(err, "error getting temporary dir")
}
r := &rcloneStorage{
Options: *opt,
temporaryDir: td,
changeCount: new(int32),
allTransfersComplete: new(int32),
}
// TLS key for rclone webdav server.
temporaryKeyPath := filepath.Join(td, "webdav.key")
// TLS cert for rclone webdav server.
temporaryCertPath := filepath.Join(td, "webdav.cert")
// password file for rclone webdav server.
temporaryHtpassword := filepath.Join(td, "htpasswd")
defer func() {
// if we return this function without setting Storage, make sure to clean everything up.
if r.Storage == nil {
r.Close(ctx) //nolint:errcheck
}
}()
// write TLS files.
// nolint:gomnd
cert, key, err := tlsutil.GenerateServerCertificate(ctx, 2048, 365*24*time.Hour, []string{"127.0.0.1"})
if err != nil {
return nil, errors.Wrap(err, "unable to generate server certificate")
}
if err = tlsutil.WritePrivateKeyToFile(temporaryKeyPath, key); err != nil {
return nil, errors.Wrap(err, "unable to write WebDAV key")
}
if err = tlsutil.WriteCertificateToFile(temporaryCertPath, cert); err != nil {
return nil, errors.Wrap(err, "unable to write WebDAV cert")
}
// temporary username and password to be used when communicating with rclone
webdavUsername := "u" + uuid.New().String()
webdavPassword := "p" + uuid.New().String()
if err = htpasswd.SetPassword(temporaryHtpassword, webdavUsername, webdavPassword, htpasswd.HashAPR1); err != nil {
return nil, errors.Wrap(err, "unable to write htpasswd file")
}
rcloneExe := defaultRCloneExe
if opt.RCloneExe != "" {
rcloneExe = opt.RCloneExe
}
statsMarker := "STATS:KOPIA"
arguments := append([]string{
"-v",
"serve", "webdav", opt.RemotePath,
"--addr", "127.0.0.1:0", // allocate random port,
"--cert", temporaryCertPath,
"--key", temporaryKeyPath,
"--htpasswd", temporaryHtpassword,
"--stats", "1s",
"--stats-one-line",
"--stats-one-line-date-format=" + statsMarker,
}, opt.RCloneArgs...)
if opt.EmbeddedConfig != "" {
tmpConfigFile := filepath.Join(r.temporaryDir, "rclone.conf")
// nolint:gomnd
if err = os.WriteFile(tmpConfigFile, []byte(opt.EmbeddedConfig), 0o600); err != nil {
return nil, errors.Wrap(err, "unable to write config file")
}
arguments = append(arguments, "--config", tmpConfigFile)
}
r.cmd = exec.Command(rcloneExe, arguments...) //nolint:gosec
r.cmd.Env = append(r.cmd.Env, opt.RCloneEnv...)
startupTimeout := rcloneStartupTimeout
if opt.StartupTimeout != 0 {
startupTimeout = time.Duration(opt.StartupTimeout) * time.Second
}
rcloneAddr, err := r.runRCloneAndWaitForServerAddress(ctx, r.cmd, statsMarker, startupTimeout)
if err != nil {
return nil, errors.Wrap(err, "unable to start rclone")
}
log(ctx).Debugf("detected webdav address: %v", rcloneAddr)
fingerprintBytes := sha256.Sum256(cert.Raw)
wst, err := webdav.New(ctx, &webdav.Options{
URL: rcloneAddr,
Username: webdavUsername,
Password: webdavPassword,
TrustedServerCertificateFingerprint: hex.EncodeToString(fingerprintBytes[:]),
AtomicWrites: opt.AtomicWrites,
Options: opt.Options,
}, isCreate)
if err != nil {
return nil, errors.Wrap(err, "error connecting to webdav storage")
}
r.Storage = wst
return r, nil
}
func init() {
blob.AddSupportedStorage(
rcloneStorageType,
func() interface{} {
return &Options{}
},
func(ctx context.Context, o interface{}, isCreate bool) (blob.Storage, error) {
return New(ctx, o.(*Options), isCreate) //nolint:forcetypeassert
})
}