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
|
package watcher
import (
"fmt"
"log"
"os"
"os/signal"
"sync"
"syscall"
"path/filepath"
"github.com/mpolden/unp/executil"
"github.com/mpolden/unp/pathutil"
"github.com/rjeczalik/notify"
)
type Handler interface {
Handle(filename, postCommand string, remove bool) error
}
type scriptHandler struct{}
func (h *scriptHandler) Handle(filename, postCommand string, remove bool) error {
data := executil.CommandData{
Dir: filepath.Dir(filename),
Base: filepath.Base(filename),
Name: filename,
}
return executil.Run(postCommand, data)
}
type Watcher struct {
config Config
events chan notify.EventInfo
signal chan os.Signal
done chan bool
mu sync.Mutex
wg sync.WaitGroup
}
func (w *Watcher) handle(name string) error {
p, ok := w.config.findPath(name)
if !ok {
return fmt.Errorf("no configured path found: %s", name)
}
if p.SkipHidden && pathutil.ContainsHidden(name) {
return fmt.Errorf("hidden parent dir or file: %s", name)
}
depth := pathutil.Depth(name)
if !p.validDepth(depth) {
return fmt.Errorf("incorrect depth: %s depth=%d min=%d max=%d",
name, depth, p.MinDepth, p.MaxDepth)
}
if match, err := p.match(filepath.Base(name)); !match {
if err != nil {
return err
}
return fmt.Errorf("no match found: %s", name)
}
return p.handler.Handle(name, p.PostCommand, p.Remove)
}
func (w *Watcher) watch() {
for _, path := range w.config.Paths {
rpath := filepath.Join(path.Name, "...")
if err := notify.Watch(rpath, w.events, notifyFlag); err != nil {
log.Printf("failed to watch %s: %s", rpath, err)
} else {
log.Printf("watching %s recursively", path.Name)
}
}
}
func (w *Watcher) reload() {
cfg, err := ReadConfig(w.config.filename)
if err == nil {
notify.Stop(w.events)
w.config = cfg
w.watch()
} else {
log.Printf("failed to read config: %s", err)
}
}
func (w *Watcher) rescan() {
for _, p := range w.config.Paths {
err := filepath.Walk(p.Name, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info == nil || !info.Mode().IsRegular() {
return nil
}
if err := w.handle(path); err != nil {
log.Print(err)
}
return nil
})
if err != nil {
log.Printf("failed to rescan %s: %s", p.Name, err)
}
}
}
func (w *Watcher) readSignal() {
for {
select {
case <-w.done:
return
case s := <-w.signal:
w.mu.Lock()
switch s {
case syscall.SIGUSR1:
log.Printf("received %s: rescanning watched directories", s)
w.rescan()
case syscall.SIGUSR2:
log.Printf("received %s: reloading configuration", s)
w.reload()
case syscall.SIGTERM, syscall.SIGINT:
log.Printf("received %s: shutting down", s)
w.Stop()
}
w.mu.Unlock()
}
}
}
func (w *Watcher) readEvent() {
for {
select {
case <-w.done:
return
case ev := <-w.events:
w.mu.Lock()
if err := w.handle(ev.Path()); err != nil {
log.Print(err)
}
w.mu.Unlock()
}
}
}
func (w *Watcher) goServe() {
w.wg.Add(2)
go func() {
defer w.wg.Done()
w.readSignal()
}()
go func() {
defer w.wg.Done()
w.readEvent()
}()
}
func (w *Watcher) Start() {
w.goServe()
w.watch()
w.wg.Wait()
}
func (w *Watcher) Stop() {
notify.Stop(w.events)
w.done <- true
w.done <- true
}
func New(cfg Config) *Watcher {
// Buffer events so that we don't miss any
events := make(chan notify.EventInfo, cfg.BufferSize)
sig := make(chan os.Signal, 1)
done := make(chan bool, 1)
signal.Notify(sig)
return &Watcher{
config: cfg,
events: events,
signal: sig,
done: done,
}
}
|