/
server.go
209 lines (187 loc) · 5.48 KB
/
server.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
// This is a somewhat faithful reproduction of etcdmain/etcd.go
package etcd
import (
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/golang/glog"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/etcdserver/etcdhttp"
"github.com/coreos/etcd/pkg/netutil"
"github.com/coreos/etcd/pkg/osutil"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/rafthttp"
)
type config struct {
// member
dir string
lpurls, lcurls []url.URL
maxSnapFiles uint
maxWalFiles uint
name string
snapCount uint64
// TODO: decouple tickMs and heartbeat tick (current heartbeat tick = 1).
// make ticks a cluster wide configuration.
TickMs uint
ElectionMs uint
// clustering
apurls, acurls []url.URL
initialCluster string
initialClusterToken string
// security
clientTLSInfo, peerTLSInfo transport.TLSInfo
}
const (
// the owner can make/remove files inside the directory
defaultName = "openshift.local"
)
// startEtcd launches the etcd server and HTTP handlers for client/server communication.
func startEtcd(cfg *config) (<-chan struct{}, error) {
cls, err := setupCluster(cfg)
if err != nil {
return nil, fmt.Errorf("error setting up initial cluster: %v", err)
}
pt, err := transport.NewTimeoutTransport(cfg.peerTLSInfo, rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout)
if err != nil {
return nil, err
}
if !cfg.peerTLSInfo.Empty() {
glog.V(2).Infof("etcd: peerTLS: %s", cfg.peerTLSInfo)
}
plns := make([]net.Listener, 0)
for _, u := range cfg.lpurls {
var l net.Listener
l, err = transport.NewTimeoutListener(u.Host, u.Scheme, cfg.peerTLSInfo, rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout)
if err != nil {
return nil, err
}
urlStr := u.String()
glog.V(2).Info("etcd: listening for peers on ", urlStr)
defer func() {
if err != nil {
l.Close()
glog.V(2).Info("etcd: stopping listening for peers on ", urlStr)
}
}()
plns = append(plns, l)
}
if !cfg.clientTLSInfo.Empty() {
glog.V(2).Infof("etcd: clientTLS: %s", cfg.clientTLSInfo)
}
clns := make([]net.Listener, 0)
for _, u := range cfg.lcurls {
var l net.Listener
l, err = transport.NewKeepAliveListener(u.Host, u.Scheme, cfg.clientTLSInfo)
if err != nil {
return nil, err
}
urlStr := u.String()
glog.V(2).Info("etcd: listening for client requests on ", urlStr)
defer func() {
if err != nil {
l.Close()
glog.V(2).Info("etcd: stopping listening for client requests on ", urlStr)
}
}()
clns = append(clns, l)
}
srvcfg := &etcdserver.ServerConfig{
Name: cfg.name,
ClientURLs: cfg.acurls,
PeerURLs: cfg.apurls,
DataDir: cfg.dir,
SnapCount: cfg.snapCount,
MaxSnapFiles: cfg.maxSnapFiles,
MaxWALFiles: cfg.maxWalFiles,
Cluster: cls,
NewCluster: true,
ForceNewCluster: false,
Transport: pt,
TickMs: cfg.TickMs,
ElectionTicks: cfg.electionTicks(),
}
var s *etcdserver.EtcdServer
s, err = etcdserver.NewServer(srvcfg)
if err != nil {
return nil, err
}
osutil.HandleInterrupts()
s.Start()
osutil.RegisterInterruptHandler(s.Stop)
ch := etcdhttp.NewClientHandler(s)
ph := etcdhttp.NewPeerHandler(s.Cluster, s.RaftHandler())
// Start the peer server in a goroutine
for _, l := range plns {
go func(l net.Listener) {
glog.Fatal(serveHTTP(l, ph, 5*time.Minute))
}(l)
}
// Start a client server goroutine for each listen address
for _, l := range clns {
go func(l net.Listener) {
// read timeout does not work with http close notify
// TODO: https://github.com/golang/go/issues/9524
glog.Fatal(serveHTTP(l, ch, 0))
}(l)
}
return s.StopNotify(), nil
}
// setupCluster sets up an initial cluster definition for bootstrap or discovery.
func setupCluster(cfg *config) (*etcdserver.Cluster, error) {
var cls *etcdserver.Cluster
var err error
switch {
default:
// We're statically configured, and cluster has appropriately been set.
cls, err = etcdserver.NewClusterFromString(cfg.initialClusterToken, cfg.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, ",")
}
func initialClusterFromName(name string) string {
n := name
if name == "" {
n = defaultName
}
return fmt.Sprintf("%s=http://localhost:7001", n)
}
func urlsFromStrings(input string, tlsInfo transport.TLSInfo) ([]url.URL, error) {
urls := []url.URL{}
for _, addr := range strings.Split(input, ",") {
addrURL := url.URL{Scheme: "http", Host: addr}
if !tlsInfo.Empty() {
addrURL.Scheme = "https"
}
urls = append(urls, addrURL)
}
return urls, nil
}
// serveHTTP accepts incoming HTTP connections on the listener l,
// creating a new service goroutine for each. The service goroutines
// read requests and then call handler to reply to them.
func serveHTTP(l net.Listener, handler http.Handler, readTimeout time.Duration) error {
logger := log.New(ioutil.Discard, "etcdhttp", 0)
// TODO: add debug flag; enable logging when debug flag is set
srv := &http.Server{
Handler: handler,
ReadTimeout: readTimeout,
ErrorLog: logger, // do not log user error
}
return srv.Serve(l)
}
func (cfg *config) resolveUrls() error {
return netutil.ResolveTCPAddrs(cfg.lpurls, cfg.apurls, cfg.lcurls, cfg.acurls)
}
func (cfg config) electionTicks() int { return int(cfg.ElectionMs / cfg.TickMs) }