This repository has been archived by the owner on Sep 21, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 6
/
start_manager.go
197 lines (164 loc) · 4.89 KB
/
start_manager.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
package start_manager
import (
"context"
"fmt"
"os/exec"
"strings"
"syscall"
"code.cloudfoundry.org/lager"
"github.com/cloudfoundry/galera-init/cluster_health_checker"
"github.com/cloudfoundry/galera-init/config"
"github.com/cloudfoundry/galera-init/db_helper"
"github.com/cloudfoundry/galera-init/os_helper"
"github.com/cloudfoundry/galera-init/start_manager/node_starter"
"github.com/cloudfoundry/galera-init/upgrader"
)
//go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 . StartManager
type StartManager interface {
Execute(ctx context.Context) error
Shutdown()
}
//go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 . ServiceStatus
type ServiceStatus interface {
Start() error
}
type startManager struct {
osHelper os_helper.OsHelper
config config.StartManager
dbHelper db_helper.DBHelper
upgrader upgrader.Upgrader
startCaller node_starter.Starter
logger lager.Logger
healthChecker cluster_health_checker.ClusterHealthChecker
mysqlCmd *exec.Cmd
mysqldPid int
galeraInitStatusServer ServiceStatus
}
func New(
osHelper os_helper.OsHelper,
config config.StartManager,
dbHelper db_helper.DBHelper,
upgrader upgrader.Upgrader,
startCaller node_starter.Starter,
logger lager.Logger,
healthChecker cluster_health_checker.ClusterHealthChecker,
galeraInitStatusServer ServiceStatus,
) StartManager {
return &startManager{
osHelper: osHelper,
config: config,
logger: logger,
dbHelper: dbHelper,
upgrader: upgrader,
startCaller: startCaller,
healthChecker: healthChecker,
galeraInitStatusServer: galeraInitStatusServer,
}
}
func (m *startManager) Execute(ctx context.Context) error {
var newNodeState string
var err error
if m.dbHelper.IsProcessRunning() {
m.logger.Info("mysqld-already-running")
m.logger.Info("shutdown-old-mysql")
m.Shutdown()
}
needsUpgrade, err := m.upgrader.NeedsUpgrade()
if err != nil {
m.logger.Error("upgrade-check-failed", err)
return err
}
if needsUpgrade {
err = m.upgrader.Upgrade()
if err != nil {
m.logger.Error("mysql-upgrade-failed", err)
return err
}
}
m.logger.Info("determining-bootstrap-procedure", lager.Data{
"ClusterIps": m.config.ClusterIps,
"BootstrapNode": m.config.BootstrapNode,
})
currentState, err := m.getCurrentNodeState()
if err != nil {
return err
}
var mysqldChan <-chan error
newNodeState, mysqldChan, err = m.startCaller.StartNodeFromState(currentState)
if err != nil {
return err
}
err = m.writeStringToFile(newNodeState)
if err != nil {
return err
}
m.logger.Info("bootstrap-complete")
m.logger.Info("waiting-for-mysqld")
m.logger.Info("status-server-starting")
m.galeraInitStatusServer.Start()
m.logger.Info("status-server-started")
select {
case err := <-mysqldChan:
m.logger.Info("mysqld-exited", lager.Data{
"error": err,
})
return err
case <-ctx.Done():
m.logger.Info("shutdown-detected")
err := m.osHelper.KillCommand(m.startCaller.GetMysqlCmd(), syscall.SIGTERM)
if err != nil {
m.logger.Error("sigterm-mysqld-failed", err)
return err
}
m.logger.Info("sigterm-mysqld-ok")
m.logger.Info("mysqld-shutdown-started")
err = <-mysqldChan
m.logger.Info("mysqld-shutdown-complete", lager.Data{
"error": err,
})
return err
}
}
func (m *startManager) getCurrentNodeState() (string, error) {
// Single-node deploy always requires bootstrapping of new cluster
if len(m.config.ClusterIps) == 1 {
return node_starter.SingleNode, nil
}
if m.firstTimeDeploy() {
if m.config.BootstrapNode {
return node_starter.NeedsBootstrap, nil
}
return node_starter.Clustered, nil
}
// If we are not a first time deploy we must already have a state file
state, err := m.readStateFromFile()
if err != nil {
m.logger.Info("state file could not be read", lager.Data{"err": err.Error()})
return "", err
}
if state == node_starter.SingleNode && len(m.config.ClusterIps) > 1 {
// Upgrading from a single-node cluster means we have to re-bootstrap
return node_starter.NeedsBootstrap, nil
}
return state, nil
}
func (m *startManager) readStateFromFile() (string, error) {
state, err := m.osHelper.ReadFile(m.config.StateFileLocation)
if err != nil {
return "", err
}
state = strings.TrimSpace(state)
m.logger.Info(fmt.Sprintf("state file exists and contains: '%s'", state))
return state, nil
}
func (m *startManager) firstTimeDeploy() bool {
return !m.osHelper.FileExists(m.config.StateFileLocation)
}
func (m *startManager) Shutdown() {
m.logger.Info("Shutting down mysqld")
m.dbHelper.StopMysqld()
}
func (m *startManager) writeStringToFile(contents string) error {
m.logger.Info(fmt.Sprintf("updating file with contents: '%s'", contents))
return m.osHelper.WriteStringToFile(m.config.StateFileLocation, contents)
}