forked from etcd-io/etcd
-
Notifications
You must be signed in to change notification settings - Fork 3
/
main.go
310 lines (264 loc) · 9.38 KB
/
main.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
/*
Copyright 2014 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 main
import (
"flag"
"fmt"
"log"
"net/http"
"os"
"strings"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/etcdserver/etcdhttp"
"github.com/coreos/etcd/pkg"
flagtypes "github.com/coreos/etcd/pkg/flags"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/proxy"
"github.com/coreos/etcd/version"
)
const (
// the owner can make/remove files inside the directory
privateDirMode = 0700
)
var (
fs = flag.NewFlagSet("etcd", flag.ContinueOnError)
name = fs.String("name", "default", "Unique human-readable name for this node")
dir = fs.String("data-dir", "", "Path to the data directory")
durl = fs.String("discovery", "", "Discovery service used to bootstrap the cluster")
snapCount = fs.Uint64("snapshot-count", etcdserver.DefaultSnapCount, "Number of committed transactions to trigger a snapshot")
printVersion = fs.Bool("version", false, "Print the version and exit")
initialCluster = fs.String("initial-cluster", "default=http://localhost:2380,default=http://localhost:7001", "Initial cluster configuration for bootstrapping")
initialClusterName = fs.String("initial-cluster-name", "etcd", "Initial name for the etcd cluster during bootstrap")
clusterState = new(etcdserver.ClusterState)
cors = &pkg.CORSInfo{}
proxyFlag = new(flagtypes.Proxy)
clientTLSInfo = transport.TLSInfo{}
peerTLSInfo = transport.TLSInfo{}
ignored = []string{
"cluster-active-size",
"cluster-remove-delay",
"cluster-sync-interval",
"config",
"force",
"max-result-buffer",
"max-retry-attempts",
"peer-heartbeat-interval",
"peer-election-timeout",
"retry-interval",
"snapshot",
"v",
"vv",
}
)
func init() {
fs.Var(clusterState, "initial-cluster-state", "Initial cluster configuration for bootstrapping")
clusterState.Set(etcdserver.ClusterStateValueNew)
fs.Var(flagtypes.NewURLsValue("http://localhost:2380,http://localhost:7001"), "initial-advertise-peer-urls", "List of this member's peer URLs to advertise to the rest of the cluster")
fs.Var(flagtypes.NewURLsValue("http://localhost:2379,http://localhost:4001"), "advertise-client-urls", "List of this member's client URLs to advertise to the rest of the cluster")
fs.Var(flagtypes.NewURLsValue("http://localhost:2380,http://localhost:7001"), "listen-peer-urls", "List of URLs to listen on for peer traffic")
fs.Var(flagtypes.NewURLsValue("http://localhost:2379,http://localhost:4001"), "listen-client-urls", "List of URLs to listen on for client traffic")
fs.Var(cors, "cors", "Comma-separated white list of origins for CORS (cross-origin resource sharing).")
fs.Var(proxyFlag, "proxy", fmt.Sprintf("Valid values include %s", strings.Join(flagtypes.ProxyValues, ", ")))
proxyFlag.Set(flagtypes.ProxyValueOff)
fs.StringVar(&clientTLSInfo.CAFile, "ca-file", "", "Path to the client server TLS CA file.")
fs.StringVar(&clientTLSInfo.CertFile, "cert-file", "", "Path to the client server TLS cert file.")
fs.StringVar(&clientTLSInfo.KeyFile, "key-file", "", "Path to the client server TLS key file.")
fs.StringVar(&peerTLSInfo.CAFile, "peer-ca-file", "", "Path to the peer server TLS CA file.")
fs.StringVar(&peerTLSInfo.CertFile, "peer-cert-file", "", "Path to the peer server TLS cert file.")
fs.StringVar(&peerTLSInfo.KeyFile, "peer-key-file", "", "Path to the peer server TLS key file.")
// backwards-compatibility with v0.4.6
fs.Var(&flagtypes.IPAddressPort{}, "addr", "DEPRECATED: Use -advertise-client-urls instead.")
fs.Var(&flagtypes.IPAddressPort{}, "bind-addr", "DEPRECATED: Use -listen-client-urls instead.")
fs.Var(&flagtypes.IPAddressPort{}, "peer-addr", "DEPRECATED: Use -initial-advertise-peer-urls instead.")
fs.Var(&flagtypes.IPAddressPort{}, "peer-bind-addr", "DEPRECATED: Use -listen-peer-urls instead.")
for _, f := range ignored {
fs.Var(&pkg.IgnoredFlag{Name: f}, f, "")
}
fs.Var(&pkg.DeprecatedFlag{Name: "peers"}, "peers", "DEPRECATED: Use -initial-cluster instead")
fs.Var(&pkg.DeprecatedFlag{Name: "peers-file"}, "peers-file", "DEPRECATED: Use -initial-cluster instead")
}
func main() {
fs.Usage = pkg.UsageWithIgnoredFlagsFunc(fs, ignored)
err := fs.Parse(os.Args[1:])
switch err {
case nil:
case flag.ErrHelp:
os.Exit(0)
default:
os.Exit(2)
}
if *printVersion {
fmt.Println("etcd version", version.Version)
os.Exit(0)
}
pkg.SetFlagsFromEnv(fs)
if string(*proxyFlag) == flagtypes.ProxyValueOff {
startEtcd()
} else {
startProxy()
}
// Block indefinitely
<-make(chan struct{})
}
// startEtcd launches the etcd server and HTTP handlers for client/server communication.
func startEtcd() {
cls, err := setupCluster()
if err != nil {
log.Fatalf("etcd: error setting up initial cluster: %v", err)
}
if *dir == "" {
*dir = fmt.Sprintf("%v.etcd", *name)
log.Printf("etcd: no data-dir provided, using default data-dir ./%s", *dir)
}
if err := os.MkdirAll(*dir, privateDirMode); err != nil {
log.Fatalf("etcd: cannot create data directory: %v", err)
}
pt, err := transport.NewTransport(peerTLSInfo)
if err != nil {
log.Fatal(err)
}
acurls, err := pkg.URLsFromFlags(fs, "advertise-client-urls", "addr", clientTLSInfo)
if err != nil {
log.Fatal(err.Error())
}
cfg := &etcdserver.ServerConfig{
Name: *name,
ClientURLs: acurls,
DataDir: *dir,
SnapCount: *snapCount,
Cluster: cls,
DiscoveryURL: *durl,
ClusterState: *clusterState,
Transport: pt,
}
s := etcdserver.NewServer(cfg)
s.Start()
ch := &pkg.CORSHandler{
Handler: etcdhttp.NewClientHandler(s),
Info: cors,
}
ph := etcdhttp.NewPeerHandler(s)
lpurls, err := pkg.URLsFromFlags(fs, "listen-peer-urls", "peer-bind-addr", peerTLSInfo)
if err != nil {
log.Fatal(err.Error())
}
for _, u := range lpurls {
l, err := transport.NewListener(u.Host, peerTLSInfo)
if err != nil {
log.Fatal(err)
}
// Start the peer server in a goroutine
urlStr := u.String()
go func() {
log.Print("Listening for peers on ", urlStr)
log.Fatal(http.Serve(l, ph))
}()
}
lcurls, err := pkg.URLsFromFlags(fs, "listen-client-urls", "bind-addr", clientTLSInfo)
if err != nil {
log.Fatal(err.Error())
}
// Start a client server goroutine for each listen address
for _, u := range lcurls {
l, err := transport.NewListener(u.Host, clientTLSInfo)
if err != nil {
log.Fatal(err)
}
urlStr := u.String()
go func() {
log.Print("Listening for client requests on ", urlStr)
log.Fatal(http.Serve(l, ch))
}()
}
}
// startProxy launches an HTTP proxy for client communication which proxies to other etcd nodes.
func startProxy() {
cls, err := setupCluster()
if err != nil {
log.Fatalf("etcd: error setting up initial cluster: %v", err)
}
pt, err := transport.NewTransport(clientTLSInfo)
if err != nil {
log.Fatal(err)
}
// TODO(jonboulle): update peerURLs dynamically (i.e. when updating
// clientURLs) instead of just using the initial fixed list here
peerURLs := cls.PeerURLs()
uf := func() []string {
cls, err := etcdserver.GetClusterFromPeers(peerURLs)
if err != nil {
log.Printf("etcd: %v", err)
return []string{}
}
return cls.ClientURLs()
}
ph := proxy.NewHandler(pt, uf)
ph = &pkg.CORSHandler{
Handler: ph,
Info: cors,
}
if string(*proxyFlag) == flagtypes.ProxyValueReadonly {
ph = proxy.NewReadonlyHandler(ph)
}
lcurls, err := pkg.URLsFromFlags(fs, "listen-client-urls", "bind-addr", clientTLSInfo)
if err != nil {
log.Fatal(err.Error())
}
// Start a proxy server goroutine for each listen address
for _, u := range lcurls {
l, err := transport.NewListener(u.Host, clientTLSInfo)
if err != nil {
log.Fatal(err)
}
host := u.Host
go func() {
log.Print("Listening for client requests on ", host)
log.Fatal(http.Serve(l, ph))
}()
}
}
// setupCluster sets up the cluster definition for bootstrap or discovery.
func setupCluster() (*etcdserver.Cluster, error) {
set := make(map[string]bool)
fs.Visit(func(f *flag.Flag) {
set[f.Name] = true
})
if set["discovery"] && set["initial-cluster"] {
return nil, fmt.Errorf("both discovery and bootstrap-config are set")
}
apurls, err := pkg.URLsFromFlags(fs, "initial-advertise-peer-urls", "addr", peerTLSInfo)
if err != nil {
return nil, err
}
var cls *etcdserver.Cluster
switch {
case set["discovery"]:
clusterStr := genClusterString(*name, apurls)
cls, err = etcdserver.NewClusterFromString(*durl, clusterStr)
case set["initial-cluster"]:
fallthrough
default:
// We're statically configured, and cluster has appropriately been set.
// Try to configure by indexing the static cluster by name.
cls, err = etcdserver.NewClusterFromString(*initialClusterName, *initialCluster)
}
return cls, err
}
func genClusterString(name string, urls types.URLs) string {
addrs := make([]string, 0)
for _, u := range urls {
addrs = append(addrs, fmt.Sprintf("%v=%v", name, u.String()))
}
return strings.Join(addrs, ",")
}