func (c *conn) watch(t *T, tx txn) {
pat := pb.GetString(t.Path)
glob, err := store.CompileGlob(pat)
if err != nil {
c.respond(t, Valid|Done, nil, errResponse(err))
return
}
var w *store.Watch
rev := pb.GetInt64(t.Rev)
if rev == 0 {
w, err = store.NewWatch(c.s.St, glob), nil
} else {
w, err = store.NewWatchFrom(c.s.St, glob, rev)
}
switch err {
case nil:
// nothing
case store.ErrTooLate:
c.respond(t, Valid|Done, nil, tooLate)
default:
c.respond(t, Valid|Done, nil, errResponse(err))
}
go func() {
defer w.Stop()
// TODO buffer (and possibly discard) events
for {
select {
case ev := <-w.C:
if closed(w.C) {
return
}
r := R{
Path: &ev.Path,
Value: []byte(ev.Body),
Rev: &ev.Seqn,
}
var flag int32
switch {
case ev.IsSet():
flag = Set
case ev.IsDel():
flag = Del
}
c.respond(t, Valid|flag, tx.cancel, &r)
case <-tx.cancel:
c.closeTxn(*t.Tag)
return
}
}
}()
}
func (c *conn) wait(t *T, tx txn) {
pat := pb.GetString(t.Path)
glob, err := store.CompileGlob(pat)
if err != nil {
c.respond(t, Valid|Done, nil, errResponse(err))
return
}
var w *store.Watch
rev := pb.GetInt64(t.Rev)
if rev == 0 {
w, err = store.NewWatch(c.s.St, glob), nil
} else {
w, err = store.NewWatchFrom(c.s.St, glob, rev)
}
switch err {
case nil:
// nothing
case store.ErrTooLate:
c.respond(t, Valid|Done, nil, tooLate)
default:
c.respond(t, Valid|Done, nil, errResponse(err))
}
go func() {
defer w.Stop()
ev := <-w.C
r := R{
Path: &ev.Path,
Value: []byte(ev.Body),
Rev: &ev.Seqn,
}
var flag int32
switch {
case ev.IsSet():
flag = Set
case ev.IsDel():
flag = Del
}
c.respond(t, Valid|flag, nil, &r)
}()
}