-
Notifications
You must be signed in to change notification settings - Fork 1
/
daemon.go
176 lines (149 loc) · 4.4 KB
/
daemon.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
package god
import (
"errors"
"fmt"
"io/fs"
"net"
"net/http"
"os"
"path/filepath"
"time"
"github.com/goccy/go-json"
"github.com/samber/do"
"github.com/shirou/gopsutil/v3/process"
"golang.org/x/text/message"
"gopkg.ilharper.com/koi/core/god/daemonproc"
"gopkg.ilharper.com/koi/core/god/daemonserv"
"gopkg.ilharper.com/koi/core/god/daemonunlk"
"gopkg.ilharper.com/koi/core/koiconfig"
"gopkg.ilharper.com/koi/core/logger"
)
const (
DaemonEndpoint = "/api"
)
type DaemonLock struct {
Pid int `json:"pid" mapstructure:"pid"`
Host string `json:"host" mapstructure:"host"`
Port string `json:"port" mapstructure:"port"`
}
// Daemon the world.
//
// This will serve as the main goroutine
// and run during the whole lifecycle.
func Daemon(i *do.Injector, startInstances bool) error {
var err error
p := do.MustInvoke[*message.Printer](i)
cfg, err := do.Invoke[*koiconfig.Config](i)
if err != nil {
return err
}
// Daemon mutex
daemonLockPath := filepath.Join(cfg.Computed.DirLock, "daemon.lock")
_, err = os.Stat(daemonLockPath)
if err != nil && (!(errors.Is(err, fs.ErrNotExist))) {
return fmt.Errorf("failed to stat %s: %w", daemonLockPath, err)
}
if err == nil {
// daemon.lock exists
pid, aliveErr := checkDaemonAlive(daemonLockPath)
if aliveErr == nil {
return fmt.Errorf("god daemon running, PID=%d\nCannot start another god daemon when there's already one.\nIf that daemon crashes, use 'koi daemon start' to fix it.\nIf you just want to restart daemon, use 'koi daemon restart'", pid)
}
_ = os.Remove(daemonLockPath)
}
// Register DaemonProcess synchronously,
do.Provide(i, daemonproc.NewDaemonProcess)
if startInstances {
// And start it in a new goroutine as early as possible.
// This ensures Koishi starts quickly first.
err = do.MustInvoke[*daemonproc.DaemonProcess](i).Init()
if err != nil {
return fmt.Errorf("daemon process init failed: %w", err)
}
}
l := do.MustInvoke[*logger.Logger](i)
// Provide daemonUnlocker.
// It will try to remove daemon.lock when shutdown.
do.Provide(i, daemonunlk.NewDaemonUnlocker)
// Construct TCP listener
listener, err := net.Listen("tcp4", "localhost:")
if err != nil {
return fmt.Errorf("failed to start daemon: %w", err)
}
addr := listener.Addr().String()
host, port, err := net.SplitHostPort(addr)
if err != nil {
return fmt.Errorf("failed to parse addr %s: %w", addr, err)
}
// daemon.lock does not exist. Writing
l.Debug(p.Sprintf("Writing daemon.lock..."))
lock, err := os.OpenFile(
daemonLockPath,
os.O_WRONLY|os.O_CREATE|os.O_EXCL, // Must create new file and write only
0o444, // -r--r--r--
)
if err != nil {
return fmt.Errorf("failed to create %s: %w", daemonLockPath, err)
}
daemonLock := &DaemonLock{
Pid: os.Getpid(),
Host: host,
Port: port,
}
daemonLockJSON, err := json.Marshal(daemonLock)
if err != nil {
return fmt.Errorf("failed to generate daemon lock data: %w", err)
}
_, err = lock.Write(daemonLockJSON)
if err != nil {
return fmt.Errorf("failed to write daemon lock data: %w", err)
}
err = lock.Close()
if err != nil {
return fmt.Errorf("failed to close daemon lock: %w", err)
}
// Invoke DaemonService
do.Provide(i, daemonserv.NewDaemonService)
service := do.MustInvoke[*daemonserv.DaemonService](i)
mux := http.NewServeMux()
mux.Handle(DaemonEndpoint, service.Handler)
server := &http.Server{
Addr: addr,
Handler: mux,
ReadTimeout: 3 * time.Second,
ReadHeaderTimeout: 3 * time.Second,
WriteTimeout: 3 * time.Second,
}
do.ProvideValue(i, server)
l.Debug(p.Sprintf("Serving daemon..."))
err = server.Serve(listener)
if !(errors.Is(err, http.ErrServerClosed)) {
return fmt.Errorf("daemon closed: %w", err)
}
return nil
}
func checkDaemonAlive(lockPath string) (int32, error) {
var err error
lockFile, err := os.ReadFile(lockPath)
if err != nil {
return 0, fmt.Errorf("failed to read %s: %w", lockPath, err)
}
var lock DaemonLock
err = json.Unmarshal(lockFile, &lock)
if err != nil {
return 0, fmt.Errorf("failed to parse %s: %w", lockPath, err)
}
pid := int32(lock.Pid)
proc, err := process.NewProcess(pid)
if err != nil {
return 0, fmt.Errorf("failed to get process %d: %w", pid, err)
}
isRunning, err := proc.IsRunning()
if err != nil {
return 0, fmt.Errorf("failed to get process %d state: %w", pid, err)
}
if !isRunning {
return 0, fmt.Errorf("process %d is not running", pid)
}
return pid, nil
}