func validateClaimedEvents() {
log.L.Debug("validating claimed events")
queueNames := db.AllQueueNames()
for i := range queueNames {
queueName := queueNames[i]
claimedKey := db.ClaimedKey(queueName)
// get the presumably oldest 50 items
var eventIDs []string
eventIDs, err := db.Inst.Cmd("LRANGE", claimedKey, -50, -1).List()
if err != nil {
log.L.Printf("ERR lrange redis replied %q", err)
return
} else if len(eventIDs) == 0 {
continue
}
var locks []interface{}
for i := range eventIDs {
lockKey := db.ItemLockKey(queueName, eventIDs[i])
locks = append(locks, lockKey)
}
var locksList [][]byte
locksList, err = db.Inst.Cmd("MGET", locks...).ListBytes()
if err != nil {
log.L.Printf("ERR mget redis replied %q", err)
return
}
for i := range locksList {
if locksList[i] == nil {
err = restoreEventToQueue(queueName, eventIDs[i])
if err != nil {
return
}
}
}
}
}
func qack(client *clients.Client, args []string) (interface{}, error) {
queueName, eventID := args[0], args[1]
claimedKey := db.ClaimedKey(queueName)
var numRemoved int
numRemoved, err := db.Inst.Cmd("LREM", claimedKey, -1, eventID).Int()
if err != nil {
return nil, fmt.Errorf("QACK LREM (claimed): %s", err)
}
// If we didn't removed the eventID from the claimed events we see if it can
// be found in unclaimed. We only do this in the uncommon case that the
// eventID isn't in claimed since unclaimed can be really large, so LREM is
// slow on it
if numRemoved == 0 {
unclaimedKey := db.UnclaimedKey(queueName)
var err error
numRemoved, err = db.Inst.Cmd("LREM", unclaimedKey, -1, eventID).Int()
if err != nil {
return nil, fmt.Errorf("QACK LREM (unclaimed): %s", err)
}
}
// We only remove the object data itself if the eventID was actually removed
// from something
if numRemoved > 0 {
itemsKey := db.ItemsKey(queueName)
lockKey := db.ItemLockKey(queueName, eventID)
_, err := db.Inst.Pipe(
db.PP("HDEL", itemsKey, eventID),
db.PP("DEL", lockKey),
)
if err != nil {
return nil, fmt.Errorf("QACK HDEL/DEL: %s", err)
}
}
return numRemoved, nil
}