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config.go
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config.go
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package task
import (
"fmt"
"log"
"os"
"sync"
"github.com/fsnotify/fsnotify"
)
type Tasks struct {
mu sync.Mutex
Tasks map[string]*Task
filename string
watcher *fsnotify.Watcher
msgr Messager
}
type TasksConfig struct {
Tasks []*Task `yaml:"task"`
}
func StartFromConfig(filename string, msgr Messager) (*Tasks, error) {
tasks := &Tasks{
Tasks: make(map[string]*Task),
filename: filename,
msgr: msgr,
}
var err error
tasks.watcher, err = fsnotify.NewWatcher()
if err != nil {
return nil, err
}
go tasks.watch()
if err := tasks.watcher.Add(filename); err != nil {
tasks.Close()
return nil, err
}
if err := tasks.Reload(); err != nil {
tasks.Close()
return nil, err
}
return tasks, nil
}
func (t *Tasks) watch() {
for {
select {
case event, ok := <-t.watcher.Events:
if !ok {
return
}
log.Println("config event:", event)
if event.Has(fsnotify.Write) {
t.msgr.Send("config changed, reloading")
if err := t.Reload(); err != nil {
t.msgr.Send("config load error: %s", err)
}
}
case err, ok := <-t.watcher.Errors:
if !ok {
return
}
t.msgr.Send("config file error: %s", err)
}
}
}
func (ts *Tasks) Reload() error {
ts.mu.Lock()
defer ts.mu.Unlock()
yaml, err := os.ReadFile(ts.filename)
if err != nil {
return err
}
cfg, err := ParseYAML(yaml)
if err != nil {
return err
}
seen := make(map[string]bool)
for _, t := range cfg.Tasks {
if seen[t.Name] {
return fmt.Errorf("duplicate config: %s", t.Name)
}
seen[t.Name] = true
if oldTask := ts.Tasks[t.Name]; oldTask != nil {
oldTask.Update(t)
continue
}
ts.Tasks[t.Name] = t
t.Loop(prefixMessager{t.Name, ts.msgr})
}
for _, t := range ts.Tasks {
if !seen[t.Name] {
t.Do("stop")
delete(ts.Tasks, t.Name)
}
}
return nil
}
func (ts *Tasks) StopAll() {
for _, t := range ts.Tasks {
t.Do("stop")
}
}
func (ts *Tasks) Get(name string) *Task {
return ts.Tasks[name]
}
func (t *Tasks) Close() {
t.watcher.Close()
}