func newScheduleData(id uid.ID, retry int32, timeout int64) scheduleData {
n := 8 + 4*8
b := make([]byte, n, n)
copy(b, id.Bytes())
binary.BigEndian.PutUint32(b[8:], uint32(retry))
binary.BigEndian.PutUint64(b[12:], uint64(timeout))
return b
}
func (d *Driver) findReplyData(eid uid.ID) (rd replyData, err error) {
err = d.db.View(func(tx *bolt.Tx) error {
ridx := tx.Bucket(bucketReplyIndex)
if ridx == nil {
return ErrBucketNotFound
}
v := ridx.Get(eid.Bytes())
if v == nil {
return storage.ErrInvalidEphemeralID
}
rd = replyData(cloneBytes(v))
return nil
})
if err == nil && rd.expireAt() <= time.Now().UnixNano() { // expired
err = storage.ErrInvalidEphemeralID
}
return
}
func (d *Driver) Dequeue(queue string, eid uid.ID) (e *storage.Envelope, err error) {
var sd scheduleData
now := time.Now().UnixNano()
err = d.db.Update(func(tx *bolt.Tx) error {
ridx, err := tx.CreateBucketIfNotExists(bucketReplyIndex)
if err != nil {
return err
}
schedule := tx.Bucket(bucketSchedule)
if schedule == nil {
return ErrBucketNotFound
}
message := tx.Bucket(bucketMessage)
if schedule == nil {
return ErrBucketNotFound
}
c := schedule.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
skey := scheduleKey(k)
sval := scheduleData(v)
if skey.timestamp() > now {
return storage.ErrEmpty
}
if !sval.retry().IsValid() {
var envelope *storage.Envelope
if b := message.Get(sval.messageID()); b != nil {
envelope, _ = reconstruct(sval, b)
}
if err := schedule.Delete(k); err != nil {
return err
}
if envelope != nil {
event.Emit(event.EventMessageDiscarded, envelope)
}
continue
}
if skey.queue() == queue {
newkey := scheduleKey(cloneBytes(k))
sd = scheduleData(cloneBytes(v))
if err := schedule.Delete(k); err != nil {
return err
}
nextTick := now + sd.timeout()
newkey.setTimestamp(nextTick)
newkey.setAccumlating(false)
retry := sd.retry()
retry.Decr()
sd.setRetry(retry)
if err := schedule.Put(newkey, sd); err != nil {
return err
}
return ridx.Put(eid.Bytes(), newReplyData(sd.messageID(), scheduleKey(newkey)))
}
}
return storage.ErrEmpty
})
if err != nil {
return
}
var data []byte
err = d.db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(bucketMessage)
if bucket == nil {
return ErrBucketNotFound
}
b := bucket.Get(sd.messageID())
if b == nil {
return ErrMessageNotFound
}
data = cloneBytes(b)
return nil
})
if err != nil {
return
}
return reconstruct(sd, data)
}
func (d *Driver) Enqueue(queue string, id uid.ID, e *storage.Envelope, opts *storage.EnqueueOptions) (*storage.EnqueueMeta, error) {
msg, err := marshal(e)
if err != nil {
return nil, err
}
var meta storage.EnqueueMeta
if opts.AccumTime > 0 {
now := time.Now().UnixNano()
err = d.db.Update(func(tx *bolt.Tx) error {
schedule := tx.Bucket(bucketSchedule)
message := tx.Bucket(bucketMessage)
if schedule == nil || message == nil {
return ErrBucketNotFound
}
c := schedule.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
sk := scheduleKey(k)
if sk.timestamp() <= now {
continue
}
if sk.queue() == queue && sk.accumlating() {
sd := scheduleData(v)
b := message.Get(sd.messageID())
if b == nil {
continue
}
meta.AccumState = storage.AccumAdded
data := make([]byte, len(b)+len(msg))
n := copy(data, b)
copy(data[n:], msg)
return message.Put(sd.messageID(), data)
}
}
return ErrMessageNotFound
})
switch err {
case nil:
return &meta, nil
case ErrMessageNotFound, ErrBucketNotFound:
default:
return nil, err
}
}
skey := newScheduleKey(queue)
if opts.AccumTime > 0 {
skey.setAccumlating(true)
meta.AccumState = storage.AccumStarted
}
sval := newScheduleData(id, int32(e.Retry), int64(e.Timeout))
for {
t := time.Now().UnixNano()
if opts.AccumTime > 0 {
t += int64(opts.AccumTime)
}
skey.setTimestamp(t)
err := d.db.Update(func(tx *bolt.Tx) error {
message, err := tx.CreateBucketIfNotExists(bucketMessage)
if err != nil {
return err
}
schedule, err := tx.CreateBucketIfNotExists(bucketSchedule)
if err != nil {
return err
}
val := schedule.Get(skey)
if val != nil {
return errConflict
}
if err = message.Put(id.Bytes(), msg); err != nil {
return err
}
return schedule.Put(skey, sval)
})
if err == errConflict {
continue
} else if err == nil && opts.AccumTime == 0 {
event.Emit(event.EventMessageAvailable, queue)
}
return &meta, err
}
}