/
manager.go
206 lines (175 loc) · 4.79 KB
/
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
198
199
200
201
202
203
204
205
206
// Copyright (C) 2014-2018 Goodrain Co., Ltd.
// RAINBOND, Application Management Platform
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package prometheus
import (
"context"
"fmt"
"github.com/Sirupsen/logrus"
"github.com/goodrain/rainbond/cmd/monitor/option"
"github.com/goodrain/rainbond/discover"
"github.com/prometheus/common/model"
"gopkg.in/yaml.v2"
"io/ioutil"
"net"
"net/http"
"os"
"sync"
"syscall"
"time"
"errors"
)
const (
STARTING = iota
STARTED
STOPPED
)
type Manager struct {
cancel context.CancelFunc
ctx context.Context
Opt *option.Config
Config *Config
Process *os.Process
Status int
Registry *discover.KeepAlive
httpClient *http.Client
l *sync.Mutex
}
func NewManager(config *option.Config) *Manager {
client := &http.Client{
Timeout: time.Second * 3,
}
reg, err := discover.CreateKeepAlive(config.EtcdEndpoints, "prometheus", config.BindIp, config.BindIp, config.Port)
if err != nil {
panic(err)
}
ioutil.WriteFile(config.ConfigFile, []byte(""), 0644)
m := &Manager{
Opt: config,
Config: &Config{
GlobalConfig: GlobalConfig{
ScrapeInterval: model.Duration(time.Second * 5),
EvaluationInterval: model.Duration(time.Second * 30),
},
},
Registry: reg,
httpClient: client,
l: &sync.Mutex{},
}
m.LoadConfig()
return m
}
func (p *Manager) StartDaemon(errchan chan error) {
logrus.Info("Starting prometheus.")
// start prometheus
procAttr := &os.ProcAttr{
Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
}
process, err := os.StartProcess("/bin/prometheus", p.Opt.StartArgs, procAttr)
if err != nil {
if err != nil {
logrus.Error("Can not start prometheus daemon: ", err)
os.Exit(11)
}
}
p.Process = process
// waiting started
for {
conn, err := net.DialTimeout("tcp", fmt.Sprintf("127.0.0.1:%d", p.Opt.Port), time.Second)
if err == nil {
logrus.Info("The prometheus daemon is started.")
conn.Close()
break
} else {
logrus.Info("Wait prometheus to start: ", err)
}
time.Sleep(time.Second)
}
p.Status = STARTED
// listen prometheus is exit
go func() {
_, err := p.Process.Wait()
logrus.Warn("Exited prometheus unexpectedly.")
if err == nil {
err = errors.New("exited prometheus unexpectedly")
}
p.Status = STOPPED
errchan <- err
}()
}
func (p *Manager) StopDaemon() {
if p.Status != STOPPED {
logrus.Info("Stopping prometheus daemon ...")
p.Process.Signal(syscall.SIGTERM)
p.Process.Wait()
logrus.Info("Stopped prometheus daemon.")
}
}
func (p *Manager) RestartDaemon() error {
if p.Status == STARTED {
logrus.Debug("Restart daemon for prometheus.")
if err := p.Process.Signal(syscall.SIGHUP); err != nil {
logrus.Error("Failed to restart daemon for prometheus: ", err)
return err
}
}
return nil
}
func (p *Manager) LoadConfig() error {
logrus.Info("Load prometheus config file.")
content, err := ioutil.ReadFile(p.Opt.ConfigFile)
if err != nil {
logrus.Error("Failed to read prometheus config file: ", err)
logrus.Info("Init config file by default values.")
return nil
}
if err := yaml.Unmarshal(content, p.Config); err != nil {
logrus.Error("Unmarshal prometheus config string to object error.", err.Error())
return err
}
logrus.Debugf("Loaded config file to memory: %+v", p.Config)
return nil
}
func (p *Manager) SaveConfig() error {
logrus.Debug("Save prometheus config file.")
data, err := yaml.Marshal(p.Config)
if err != nil {
logrus.Error("Marshal prometheus config to yaml error.", err.Error())
return err
}
err = ioutil.WriteFile(p.Opt.ConfigFile, data, 0644)
if err != nil {
logrus.Error("Write prometheus config file error.", err.Error())
return err
}
return nil
}
func (p *Manager) UpdateScrape(scrape *ScrapeConfig) {
logrus.Debugf("update scrape: %+v", scrape)
p.l.Lock()
defer p.l.Unlock()
exist := false
for i, s := range p.Config.ScrapeConfigs {
if s.JobName == scrape.JobName {
p.Config.ScrapeConfigs[i] = scrape
exist = true
break
}
}
if !exist {
p.Config.ScrapeConfigs = append(p.Config.ScrapeConfigs, scrape)
}
p.SaveConfig()
p.RestartDaemon()
}