go-pkg/asynq
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Use command BRPUSHLPOP to move from queue to in_progress in redis

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This commit is contained in:
Ken Hibino 2019-11-23 08:43:41 -08:00
parent 76ceb282a9
commit 4a327933bd
3 changed files with 23 additions and 29 deletions
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9
processor.go
View File

@ -59,11 +59,10 @@ func (p *processor) start() {
// exec pulls a task out of the queue and starts a worker goroutine to
// process the task.
func (p *processor) exec() {
// NOTE: BLPOP needs to timeout to avoid blocking forever
// NOTE: dequeue needs to timeout to avoid blocking forever
// in case of a program shutdown or additon of a new queue.
const timeout = 5 * time.Second
// TODO(hibiken): sort the list of queues in order of priority
msg, err := p.rdb.dequeue(timeout, p.rdb.listQueues()...)
msg, err := p.rdb.dequeue(defaultQueue, timeout)
if err != nil {
switch err {
case errQueuePopTimeout:
@ -82,8 +81,8 @@ func (p *processor) exec() {
p.sema <- struct{}{} // acquire token
go func(task *Task) {
defer func() {
if err := p.rdb.srem(inProgress, msg); err != nil {
log.Printf("[SERVER ERROR] SREM failed: %v\n", err)
if err := p.rdb.lrem(inProgress, msg); err != nil {
log.Printf("[SERVER ERROR] LREM failed: %v\n", err)
}
<-p.sema // release token
}()

25
rdb.go
View File

@ -14,12 +14,12 @@ import (
// Redis keys
const (
queuePrefix = "asynq:queues:" // LIST - asynq:queues:<qname>
defaultQueue = queuePrefix + "default" // LIST
allQueues = "asynq:queues" // SET
scheduled = "asynq:scheduled" // ZSET
retry = "asynq:retry" // ZSET
dead = "asynq:dead" // ZSET
inProgress = "asynq:in_progress" // SET
heartbeatPrefix = "asynq:heartbeat:" // STRING - asynq:heartbeat:<taskID>
)
var (
@ -58,38 +58,33 @@ func (r *rdb) push(msg *taskMessage) error {
}
// dequeue blocks until there is a taskMessage available to be processed,
// once available, it adds the task to "in progress" set and returns the task.
func (r *rdb) dequeue(timeout time.Duration, keys ...string) (*taskMessage, error) {
// TODO(hibiken): Make BRPOP & SADD atomic.
res, err := r.client.BRPop(timeout, keys...).Result()
// once available, it adds the task to "in progress" list and returns the task.
func (r *rdb) dequeue(qname string, timeout time.Duration) (*taskMessage, error) {
data, err := r.client.BRPopLPush(qname, inProgress, timeout).Result()
if err != nil {
if err != redis.Nil {
return nil, fmt.Errorf("command BLPOP %v %v failed: %v", timeout, keys, err)
return nil, fmt.Errorf("command BRPOPLPUSH %q %q %v failed: %v", qname, inProgress, timeout, err)
}
return nil, errQueuePopTimeout
}
q, data := res[0], res[1]
err = r.client.SAdd(inProgress, data).Err()
if err != nil {
return nil, fmt.Errorf("command SADD %q %v failed: %v", inProgress, data, err)
}
var msg taskMessage
err = json.Unmarshal([]byte(data), &msg)
if err != nil {
return nil, errDeserializeTask
}
fmt.Printf("[DEBUG] perform task %+v from %s\n", msg, q)
fmt.Printf("[DEBUG] perform task %+v from %s\n", msg, qname)
return &msg, nil
}
func (r *rdb) srem(key string, msg *taskMessage) error {
func (r *rdb) lrem(key string, msg *taskMessage) error {
bytes, err := json.Marshal(msg)
if err != nil {
return fmt.Errorf("could not encode task into JSON: %v", err)
}
err = r.client.SRem(key, string(bytes)).Err()
// NOTE: count ZERO means "remove all elements equal to val"
err = r.client.LRem(key, 0, string(bytes)).Err()
if err != nil {
return fmt.Errorf("command SREM %s %s failed: %v", key, string(bytes), err)
return fmt.Errorf("command LREM %s 0 %s failed: %v", key, string(bytes), err)
}
return nil
}

6
rdb_test.go
View File

@ -63,7 +63,7 @@ func TestDequeueImmediateReturn(t *testing.T) {
}
r.push(msg)
res, err := r.dequeue(time.Second, "asynq:queues:csv")
res, err := r.dequeue("asynq:queues:csv", time.Second)
if err != nil {
t.Fatalf("r.bpop() failed: %v", err)
}
@ -71,7 +71,7 @@ func TestDequeueImmediateReturn(t *testing.T) {
if !cmp.Equal(res, msg) {
t.Errorf("cmp.Equal(res, msg) = %t, want %t", false, true)
}
jobs := client.SMembers(inProgress).Val()
jobs := client.LRange(inProgress, 0, -1).Val()
if len(jobs) != 1 {
t.Fatalf("len(jobs) = %d, want %d", len(jobs), 1)
}
@ -87,7 +87,7 @@ func TestDequeueImmediateReturn(t *testing.T) {
func TestDequeueTimeout(t *testing.T) {
r := setup()
_, err := r.dequeue(time.Second, "asynq:queues:default")
_, err := r.dequeue("asynq:queues:default", time.Second)
if err != errQueuePopTimeout {
t.Errorf("err = %v, want %v", err, errQueuePopTimeout)
}