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fsnotify.go
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/
fsnotify.go
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package api
import (
"context"
"log"
"net/http"
"time"
"github.com/datewu/gtea"
"github.com/datewu/gtea/handler/sse"
"github.com/fsnotify/fsnotify"
)
type reloadSSE struct {
app *gtea.App
fs *fsnotify.Watcher
dedup time.Duration
reload func() error
}
func (r *reloadSSE) deduplicated() {
timeout := time.After(r.dedup)
for {
select {
case <-timeout:
return
case _, ok := <-r.fs.Events:
if !ok {
return
}
}
}
}
func newReloadSSE(app *gtea.App, reload func() error, dirs ...string) *reloadSSE {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
closeFn := func() {
if err := watcher.Close(); err != nil {
app.Logger.Err(err)
}
}
app.AddClearFn(closeFn)
for _, d := range dirs {
if err = watcher.Add(d); err != nil {
app.Logger.Err(err)
return nil
}
}
return &reloadSSE{
app: app,
fs: watcher,
dedup: 200 * time.Millisecond,
reload: reload,
}
}
// Send
func (r *reloadSSE) Send(ctx context.Context, w http.ResponseWriter, f http.Flusher) {
if r == nil {
return
}
done := ctx.Done()
if r.app.Env() != gtea.DevEnv {
e := sse.NewEvent("reload", "not in development mode. bye!")
if err := e.Send(w, f); err != nil {
r.app.Logger.Err(err)
}
if err := sse.Shutdown(w, f); err != nil {
r.app.Logger.Err(err)
}
return
}
// defer sse.Shutdown(w, f)
heartbeat := sse.NewMessage(1)
r.app.Logger.Info("sse send heatbeat")
heartbeat.Send(w, f)
// reload := sse.NewMessage("setTimeout(() => location.reload(), 100)")
reload := sse.NewMessage("location.reload()")
for {
select {
case <-done:
r.app.Logger.Info("sse client disconnected")
return
case event, ok := <-r.fs.Events:
if !ok {
return
}
if event.Has(fsnotify.Write) {
r.deduplicated() // ingore queue header
if r.reload != nil {
if err := r.reload(); err != nil {
r.app.Logger.Err(err)
} else {
r.app.Logger.Info("reload template success")
}
}
if err := reload.Send(w, f); err != nil {
r.app.Logger.Err(err)
}
r.app.Logger.Info("send reload sse message, and return from for loop" + event.Name)
return
}
r.app.Logger.Info("not write event, continue")
case err, ok := <-r.fs.Errors:
if !ok {
return
}
r.app.Logger.Err(err)
return
}
}
}