forked from evergreen-ci/evergreen
/
runner.go
174 lines (149 loc) · 4.62 KB
/
runner.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
// Main package for the Evergreen runner.
package main
import (
"bytes"
"flag"
"fmt"
"os"
"os/signal"
"sync"
"syscall"
"text/template"
"time"
"github.com/evergreen-ci/evergreen"
"github.com/evergreen-ci/evergreen/db"
"github.com/evergreen-ci/evergreen/notify"
_ "github.com/evergreen-ci/evergreen/plugin/config"
. "github.com/evergreen-ci/evergreen/runner"
"github.com/evergreen-ci/evergreen/util"
"github.com/mongodb/grip"
"github.com/mongodb/grip/level"
"github.com/mongodb/grip/message"
"github.com/mongodb/grip/send"
"github.com/pkg/errors"
)
func init() {
usageTemplate := template.Must(template.New("usage").Parse(
`{{.Program}} runs the Evergreen processes at regular intervals.
Usage:
{{.Program}} [flags] [process name]
Supported flags are:
{{.FlagDefaults}}
Supported proccesses are:{{range .Runners}}
{{.Name}}: {{.Description}}{{end}}
Pass a single process name to run that process once,
or leave [process name] blank to run all processes
at regular intervals.
`))
flag.Usage = func() {
// capture the default flag output for use in the template
flagDefaults := &bytes.Buffer{}
flag.CommandLine.SetOutput(flagDefaults)
flag.CommandLine.PrintDefaults()
// execute the usage template
usageTemplate.Execute(os.Stderr, struct {
Program string
FlagDefaults string
Runners []ProcessRunner
}{os.Args[0], flagDefaults.String(), Runners})
}
}
var (
runInterval = int64(30)
)
func main() {
settings := evergreen.GetSettingsOrExit()
if settings.Runner.LogFile != "" {
sender, err := send.MakeFileLogger(settings.Runner.LogFile)
grip.CatchEmergencyFatal(err)
defer sender.Close()
grip.CatchEmergencyFatal(grip.SetSender(sender))
} else {
sender := send.MakeNative()
defer sender.Close()
grip.CatchEmergencyFatal(grip.SetSender(sender))
}
evergreen.SetLegacyLogger()
grip.SetName("evg-runner")
grip.SetDefaultLevel(level.Info)
grip.SetThreshold(level.Debug)
grip.Notice(message.Fields{"build": evergreen.BuildRevision, "process": grip.Name()})
home := evergreen.FindEvergreenHome()
if home == "" {
grip.EmergencyFatal("EVGHOME environment variable must be set to execute runner")
}
defer util.RecoverAndLogStackTrace()
db.SetGlobalSessionProvider(db.SessionFactoryFromConfig(settings))
// just run one process if an argument was passed in
if flag.Arg(0) != "" {
grip.CatchEmergencyFatal(runProcessByName(flag.Arg(0), settings))
}
if settings.Runner.IntervalSeconds <= 0 {
grip.Warningf("Interval set to %v (<= 0s) using %v instead",
settings.Runner.IntervalSeconds, runInterval)
} else {
runInterval = settings.Runner.IntervalSeconds
}
// start and schedule runners
wg := &sync.WaitGroup{}
ch := startRunners(wg, settings)
go listenForSIGTERM(ch)
// wait for all the processes to exit
wg.Wait()
grip.Infof("Cleanly terminated all %d processes", len(Runners))
}
// startRunners starts a goroutine for each runner exposed via Runners. It
// returns a channel on which all runners listen on, for when to terminate.
func startRunners(wg *sync.WaitGroup, s *evergreen.Settings) chan bool {
c := make(chan bool)
duration := time.Duration(runInterval) * time.Second
for _, r := range Runners {
wg.Add(1)
// start each runner in its own goroutine
go func(r ProcessRunner, s *evergreen.Settings, terminateChan chan bool) {
defer wg.Done()
grip.Infoln("Starting runner process:", r.Name())
loop := true
for loop {
if err := r.Run(s); err != nil {
subject := fmt.Sprintf("%v failure", r.Name())
grip.Error(err)
if err = notify.NotifyAdmins(subject, err.Error(), s); err != nil {
grip.Errorln("sending email: %+v", err)
}
}
select {
case <-time.NewTimer(duration).C:
case loop = <-terminateChan:
}
}
grip.Infoln("Cleanly terminated runner process:", r.Name())
}(r, s, c)
}
return c
}
// listenForSIGTERM listens for the SIGTERM signal and closes the
// channel on which each runner is listening as soon as the signal
// is received.
func listenForSIGTERM(ch chan bool) {
sigChan := make(chan os.Signal)
// notify us when SIGTERM is received
signal.Notify(sigChan, syscall.SIGTERM)
<-sigChan
grip.Infof("Terminating %d processes", len(Runners))
close(ch)
}
// runProcessByName runs a single process given its name and evergreen Settings.
// Returns an error if the process does not exist.
func runProcessByName(name string, settings *evergreen.Settings) error {
for _, r := range Runners {
if r.Name() == name {
grip.Infof("Running standalone %s process", name)
if err := r.Run(settings); err != nil {
grip.Error(err)
}
return nil
}
}
return errors.Errorf("process '%s' does not exist", name)
}