-
Notifications
You must be signed in to change notification settings - Fork 833
/
starter.go
411 lines (375 loc) · 10.4 KB
/
starter.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
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package starter
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"path"
"strings"
"syscall"
"github.com/coreos/etcd/client"
"github.com/coreos/etcd/etcdmain"
"github.com/coreos/etcd/migrate"
"github.com/coreos/etcd/pkg/fileutil"
"github.com/coreos/etcd/pkg/flags"
"github.com/coreos/etcd/pkg/osutil"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
)
type version string
const (
internalV1 version = "1"
internalV2 version = "2"
internalV2Proxy version = "2.proxy"
internalUnknown version = "unknown"
v0_4 version = "v0.4"
v2_0 version = "v2.0"
v2_0Proxy version = "v2.0 proxy"
empty version = "empty"
unknown version = "unknown"
defaultInternalV1etcdBinaryDir = "/usr/libexec/etcd/internal_versions/"
)
var (
v2SpecialFlags = []string{
"initial-cluster",
"listen-peer-urls",
"listen-client-urls",
"proxy",
}
)
func StartDesiredVersion(args []string) {
fs, err := parseConfig(args)
if err != nil {
return
}
ver := checkInternalVersion(fs)
log.Printf("starter: start etcd version %s", ver)
switch ver {
case internalV1:
startInternalV1()
case internalV2:
case internalV2Proxy:
if _, err := os.Stat(standbyInfo4(fs.Lookup("data-dir").Value.String())); err != nil {
log.Printf("starter: Detect standby_info file exists, and add --proxy=on flag to ensure it runs in v2.0 proxy mode.")
log.Printf("starter: Before removing v0.4 data, --proxy=on flag MUST be added.")
}
// append proxy flag to args to trigger proxy mode
os.Args = append(os.Args, "-proxy=on")
default:
log.Panicf("starter: unhandled start version")
}
}
func checkInternalVersion(fs *flag.FlagSet) version {
// If it uses 2.0 env var explicitly, start 2.0
for _, name := range v2SpecialFlags {
if fs.Lookup(name).Value.String() != "" {
return internalV2
}
}
dataDir := fs.Lookup("data-dir").Value.String()
if dataDir == "" {
log.Fatalf("starter: please set --data-dir or ETCD_DATA_DIR for etcd")
}
// check the data directory
ver, err := checkVersion(dataDir)
if err != nil {
log.Fatalf("starter: failed to detect etcd version in %v: %v", dataDir, err)
}
log.Printf("starter: detect etcd version %s in %s", ver, dataDir)
switch ver {
case v2_0:
return internalV2
case v2_0Proxy:
return internalV2Proxy
case v0_4:
standbyInfo, err := migrate.DecodeStandbyInfo4FromFile(standbyInfo4(dataDir))
if err != nil && !os.IsNotExist(err) {
log.Fatalf("starter: failed to decode standbyInfo in %v: %v", dataDir, err)
}
inStandbyMode := standbyInfo != nil && standbyInfo.Running
if inStandbyMode {
ver, err := checkInternalVersionByClientURLs(standbyInfo.ClientURLs(), clientTLSInfo(fs))
if err != nil {
log.Printf("starter: failed to check start version through peers: %v", err)
return internalV1
}
if ver == internalV2 {
osutil.Unsetenv("ETCD_DISCOVERY")
os.Args = append(os.Args, "-initial-cluster", standbyInfo.InitialCluster())
return internalV2Proxy
}
return ver
}
ver, err := checkInternalVersionByDataDir4(dataDir)
if err != nil {
log.Fatalf("starter: failed to check start version in %v: %v", dataDir, err)
}
return ver
case empty:
discovery := fs.Lookup("discovery").Value.String()
dpeers, err := getPeersFromDiscoveryURL(discovery)
if err != nil {
log.Printf("starter: failed to get peers from discovery %s: %v", discovery, err)
}
peerStr := fs.Lookup("peers").Value.String()
ppeers := getPeersFromPeersFlag(peerStr, peerTLSInfo(fs))
urls := getClientURLsByPeerURLs(append(dpeers, ppeers...), peerTLSInfo(fs))
ver, err := checkInternalVersionByClientURLs(urls, clientTLSInfo(fs))
if err != nil {
log.Printf("starter: failed to check start version through peers: %v", err)
return internalV2
}
return ver
}
// never reach here
log.Panicf("starter: unhandled etcd version in %v", dataDir)
return internalUnknown
}
func checkVersion(dataDir string) (version, error) {
names, err := fileutil.ReadDir(dataDir)
if err != nil {
if os.IsNotExist(err) {
err = nil
}
return empty, err
}
if len(names) == 0 {
return empty, nil
}
nameSet := types.NewUnsafeSet(names...)
if nameSet.ContainsAll([]string{"member"}) {
return v2_0, nil
}
if nameSet.ContainsAll([]string{"proxy"}) {
return v2_0Proxy, nil
}
if nameSet.ContainsAll([]string{"snapshot", "conf", "log"}) {
return v0_4, nil
}
if nameSet.ContainsAll([]string{"standby_info"}) {
return v0_4, nil
}
return unknown, fmt.Errorf("failed to check version")
}
func checkInternalVersionByDataDir4(dataDir string) (version, error) {
// check v0.4 snapshot
snap4, err := migrate.DecodeLatestSnapshot4FromDir(snapDir4(dataDir))
if err != nil {
return internalUnknown, err
}
if snap4 != nil {
st := &migrate.Store4{}
if err := json.Unmarshal(snap4.State, st); err != nil {
return internalUnknown, err
}
dir := st.Root.Children["_etcd"]
n, ok := dir.Children["next-internal-version"]
if ok && n.Value == "2" {
return internalV2, nil
}
}
// check v0.4 log
ents4, err := migrate.DecodeLog4FromFile(logFile4(dataDir))
if err != nil {
return internalUnknown, err
}
for _, e := range ents4 {
cmd, err := migrate.NewCommand4(e.GetCommandName(), e.GetCommand(), nil)
if err != nil {
return internalUnknown, err
}
setcmd, ok := cmd.(*migrate.SetCommand)
if !ok {
continue
}
if setcmd.Key == "/_etcd/next-internal-version" && setcmd.Value == "2" {
return internalV2, nil
}
}
return internalV1, nil
}
func getClientURLsByPeerURLs(peers []string, tls *TLSInfo) []string {
c, err := newDefaultClient(tls)
if err != nil {
log.Printf("starter: new client error: %v", err)
return nil
}
var urls []string
for _, u := range peers {
resp, err := c.Get(u + "/etcdURL")
if err != nil {
log.Printf("starter: failed to get /etcdURL from %s", u)
continue
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Printf("starter: failed to read body from %s", u)
continue
}
urls = append(urls, string(b))
}
return urls
}
func checkInternalVersionByClientURLs(urls []string, tls *TLSInfo) (version, error) {
c, err := newDefaultClient(tls)
if err != nil {
return internalUnknown, err
}
for _, u := range urls {
resp, err := c.Get(u + "/version")
if err != nil {
log.Printf("starter: failed to get /version from %s", u)
continue
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Printf("starter: failed to read body from %s", u)
continue
}
var m map[string]string
err = json.Unmarshal(b, &m)
if err != nil {
log.Printf("starter: failed to unmarshal body %s from %s", b, u)
continue
}
switch m["internalVersion"] {
case "1":
return internalV1, nil
case "2":
return internalV2, nil
default:
log.Printf("starter: unrecognized internal version %s from %s", m["internalVersion"], u)
}
}
return internalUnknown, fmt.Errorf("failed to get version from urls %v", urls)
}
func getPeersFromDiscoveryURL(discoverURL string) ([]string, error) {
if discoverURL == "" {
return nil, nil
}
u, err := url.Parse(discoverURL)
if err != nil {
return nil, err
}
token := u.Path
u.Path = ""
c, err := client.NewHTTPClient(&http.Transport{}, []string{u.String()})
if err != nil {
return nil, err
}
dc := client.NewDiscoveryKeysAPI(c)
ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
resp, err := dc.Get(ctx, token)
cancel()
if err != nil {
return nil, err
}
peers := make([]string, 0)
// append non-config keys to peers
for _, n := range resp.Node.Nodes {
if g := path.Base(n.Key); g == "_config" || g == "_state" {
continue
}
peers = append(peers, n.Value)
}
return peers, nil
}
func getPeersFromPeersFlag(str string, tls *TLSInfo) []string {
peers := trimSplit(str, ",")
for i, p := range peers {
peers[i] = tls.Scheme() + "://" + p
}
return peers
}
func startInternalV1() {
p := os.Getenv("ETCD_BINARY_DIR")
if p == "" {
p = defaultInternalV1etcdBinaryDir
}
p = path.Join(p, "1")
err := syscall.Exec(p, os.Args, syscall.Environ())
if err != nil {
log.Fatalf("starter: failed to execute internal v1 etcd: %v", err)
}
}
func newDefaultClient(tls *TLSInfo) (*http.Client, error) {
tr := &http.Transport{}
if tls.Scheme() == "https" {
tlsConfig, err := tls.ClientConfig()
if err != nil {
return nil, err
}
tr.TLSClientConfig = tlsConfig
}
return &http.Client{Transport: tr}, nil
}
type value struct {
s string
}
func (v *value) String() string { return v.s }
func (v *value) Set(s string) error {
v.s = s
return nil
}
// parseConfig parses out the input config from cmdline arguments and
// environment variables.
func parseConfig(args []string) (*flag.FlagSet, error) {
fs := flag.NewFlagSet("full flagset", flag.ContinueOnError)
etcdmain.NewConfig().VisitAll(func(f *flag.Flag) {
fs.Var(&value{}, f.Name, "")
})
if err := fs.Parse(args); err != nil {
return nil, err
}
if err := flags.SetFlagsFromEnv(fs); err != nil {
return nil, err
}
return fs, nil
}
func clientTLSInfo(fs *flag.FlagSet) *TLSInfo {
return &TLSInfo{
CAFile: fs.Lookup("ca-file").Value.String(),
CertFile: fs.Lookup("cert-file").Value.String(),
KeyFile: fs.Lookup("key-file").Value.String(),
}
}
func peerTLSInfo(fs *flag.FlagSet) *TLSInfo {
return &TLSInfo{
CAFile: fs.Lookup("peer-ca-file").Value.String(),
CertFile: fs.Lookup("peer-cert-file").Value.String(),
KeyFile: fs.Lookup("peer-key-file").Value.String(),
}
}
func snapDir4(dataDir string) string {
return path.Join(dataDir, "snapshot")
}
func logFile4(dataDir string) string {
return path.Join(dataDir, "log")
}
func standbyInfo4(dataDir string) string {
return path.Join(dataDir, "standby_info")
}
func trimSplit(s, sep string) []string {
trimmed := strings.Split(s, sep)
for i := range trimmed {
trimmed[i] = strings.TrimSpace(trimmed[i])
}
return trimmed
}