mirror of
https://github.com/hibiken/asynq.git
synced 2024-09-20 19:06:46 +08:00
306 lines
8.8 KiB
Go
306 lines
8.8 KiB
Go
// Copyright 2020 Kentaro Hibino. All rights reserved.
|
|
// Use of this source code is governed by a MIT license
|
|
// that can be found in the LICENSE file.
|
|
|
|
// Package rdb encapsulates the interactions with redis.
|
|
package rdb
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/go-redis/redis/v7"
|
|
"github.com/hibiken/asynq/internal/base"
|
|
"github.com/spf13/cast"
|
|
)
|
|
|
|
var (
|
|
// ErrNoProcessableTask indicates that there are no tasks ready to be processed.
|
|
ErrNoProcessableTask = errors.New("no tasks are ready for processing")
|
|
|
|
// ErrTaskNotFound indicates that a task that matches the given identifier was not found.
|
|
ErrTaskNotFound = errors.New("could not find a task")
|
|
)
|
|
|
|
const statsTTL = 90 * 24 * time.Hour // 90 days
|
|
|
|
// RDB is a client interface to query and mutate task queues.
|
|
type RDB struct {
|
|
client *redis.Client
|
|
}
|
|
|
|
// NewRDB returns a new instance of RDB.
|
|
func NewRDB(client *redis.Client) *RDB {
|
|
return &RDB{client}
|
|
}
|
|
|
|
// Close closes the connection with redis server.
|
|
func (r *RDB) Close() error {
|
|
return r.client.Close()
|
|
}
|
|
|
|
// Enqueue inserts the given task to the tail of the queue.
|
|
func (r *RDB) Enqueue(msg *base.TaskMessage) error {
|
|
bytes, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
key := base.QueueKey(msg.Queue)
|
|
return r.client.LPush(key, string(bytes)).Err()
|
|
}
|
|
|
|
// Dequeue queries given queues in order and pops a task message if there
|
|
// is one and returns it. If all queues are empty, ErrNoProcessableTask
|
|
// error is returned.
|
|
func (r *RDB) Dequeue(qnames ...string) (*base.TaskMessage, error) {
|
|
var keys []string
|
|
for _, q := range qnames {
|
|
keys = append(keys, base.QueueKey(q))
|
|
}
|
|
data, err := r.dequeue(keys...)
|
|
if err == redis.Nil {
|
|
return nil, ErrNoProcessableTask
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var msg base.TaskMessage
|
|
err = json.Unmarshal([]byte(data), &msg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &msg, nil
|
|
}
|
|
|
|
func (r *RDB) dequeue(queues ...string) (data string, err error) {
|
|
var args []interface{}
|
|
for _, qkey := range queues {
|
|
args = append(args, qkey)
|
|
}
|
|
script := redis.NewScript(`
|
|
local res
|
|
for _, qkey in ipairs(ARGV) do
|
|
res = redis.call("RPOPLPUSH", qkey, KEYS[1])
|
|
if res then
|
|
return res
|
|
end
|
|
end
|
|
return res
|
|
`)
|
|
res, err := script.Run(r.client, []string{base.InProgressQueue}, args...).Result()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return cast.ToStringE(res)
|
|
}
|
|
|
|
// Done removes the task from in-progress queue to mark the task as done.
|
|
func (r *RDB) Done(msg *base.TaskMessage) error {
|
|
bytes, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Note: LREM count ZERO means "remove all elements equal to val"
|
|
// KEYS[1] -> asynq:in_progress
|
|
// KEYS[2] -> asynq:processed:<yyyy-mm-dd>
|
|
// ARGV[1] -> base.TaskMessage value
|
|
// ARGV[2] -> stats expiration timestamp
|
|
script := redis.NewScript(`
|
|
redis.call("LREM", KEYS[1], 0, ARGV[1])
|
|
local n = redis.call("INCR", KEYS[2])
|
|
if tonumber(n) == 1 then
|
|
redis.call("EXPIREAT", KEYS[2], ARGV[2])
|
|
end
|
|
return redis.status_reply("OK")
|
|
`)
|
|
now := time.Now()
|
|
processedKey := base.ProcessedKey(now)
|
|
expireAt := now.Add(statsTTL)
|
|
return script.Run(r.client,
|
|
[]string{base.InProgressQueue, processedKey},
|
|
string(bytes), expireAt.Unix()).Err()
|
|
}
|
|
|
|
// Requeue moves the task from in-progress queue to the default
|
|
// queue.
|
|
func (r *RDB) Requeue(msg *base.TaskMessage) error {
|
|
bytes, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Note: Use RPUSH to push to the head of the queue.
|
|
// KEYS[1] -> asynq:in_progress
|
|
// KEYS[2] -> asynq:queues:default
|
|
// ARGV[1] -> base.TaskMessage value
|
|
script := redis.NewScript(`
|
|
redis.call("LREM", KEYS[1], 0, ARGV[1])
|
|
redis.call("RPUSH", KEYS[2], ARGV[1])
|
|
return redis.status_reply("OK")
|
|
`)
|
|
return script.Run(r.client,
|
|
[]string{base.InProgressQueue, base.DefaultQueue},
|
|
string(bytes)).Err()
|
|
}
|
|
|
|
// Schedule adds the task to the backlog queue to be processed in the future.
|
|
func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
|
|
bytes, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
score := float64(processAt.Unix())
|
|
return r.client.ZAdd(base.ScheduledQueue,
|
|
&redis.Z{Member: string(bytes), Score: score}).Err()
|
|
}
|
|
|
|
// Retry moves the task from in-progress to retry queue, incrementing retry count
|
|
// and assigning error message to the task message.
|
|
func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) error {
|
|
bytesToRemove, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
modified := *msg
|
|
modified.Retried++
|
|
modified.ErrorMsg = errMsg
|
|
bytesToAdd, err := json.Marshal(&modified)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// KEYS[1] -> asynq:in_progress
|
|
// KEYS[2] -> asynq:retry
|
|
// KEYS[3] -> asynq:processed:<yyyy-mm-dd>
|
|
// KEYS[4] -> asynq:failure:<yyyy-mm-dd>
|
|
// ARGV[1] -> base.TaskMessage value to remove from base.InProgressQueue queue
|
|
// ARGV[2] -> base.TaskMessage value to add to Retry queue
|
|
// ARGV[3] -> retry_at UNIX timestamp
|
|
// ARGV[4] -> stats expiration timestamp
|
|
script := redis.NewScript(`
|
|
redis.call("LREM", KEYS[1], 0, ARGV[1])
|
|
redis.call("ZADD", KEYS[2], ARGV[3], ARGV[2])
|
|
local n = redis.call("INCR", KEYS[3])
|
|
if tonumber(n) == 1 then
|
|
redis.call("EXPIREAT", KEYS[3], ARGV[4])
|
|
end
|
|
local m = redis.call("INCR", KEYS[4])
|
|
if tonumber(m) == 1 then
|
|
redis.call("EXPIREAT", KEYS[4], ARGV[4])
|
|
end
|
|
return redis.status_reply("OK")
|
|
`)
|
|
now := time.Now()
|
|
processedKey := base.ProcessedKey(now)
|
|
failureKey := base.FailureKey(now)
|
|
expireAt := now.Add(statsTTL)
|
|
return script.Run(r.client,
|
|
[]string{base.InProgressQueue, base.RetryQueue, processedKey, failureKey},
|
|
string(bytesToRemove), string(bytesToAdd), processAt.Unix(), expireAt.Unix()).Err()
|
|
}
|
|
|
|
const (
|
|
maxDeadTasks = 10000
|
|
deadExpirationInDays = 90
|
|
)
|
|
|
|
// Kill sends the task to "dead" queue from in-progress queue, assigning
|
|
// the error message to the task.
|
|
// It also trims the set by timestamp and set size.
|
|
func (r *RDB) Kill(msg *base.TaskMessage, errMsg string) error {
|
|
bytesToRemove, err := json.Marshal(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
modified := *msg
|
|
modified.ErrorMsg = errMsg
|
|
bytesToAdd, err := json.Marshal(&modified)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
now := time.Now()
|
|
limit := now.AddDate(0, 0, -deadExpirationInDays).Unix() // 90 days ago
|
|
processedKey := base.ProcessedKey(now)
|
|
failureKey := base.FailureKey(now)
|
|
expireAt := now.Add(statsTTL)
|
|
// KEYS[1] -> asynq:in_progress
|
|
// KEYS[2] -> asynq:dead
|
|
// KEYS[3] -> asynq:processed:<yyyy-mm-dd>
|
|
// KEYS[4] -> asynq.failure:<yyyy-mm-dd>
|
|
// ARGV[1] -> base.TaskMessage value to remove from base.InProgressQueue queue
|
|
// ARGV[2] -> base.TaskMessage value to add to Dead queue
|
|
// ARGV[3] -> died_at UNIX timestamp
|
|
// ARGV[4] -> cutoff timestamp (e.g., 90 days ago)
|
|
// ARGV[5] -> max number of tasks in dead queue (e.g., 100)
|
|
// ARGV[6] -> stats expiration timestamp
|
|
script := redis.NewScript(`
|
|
redis.call("LREM", KEYS[1], 0, ARGV[1])
|
|
redis.call("ZADD", KEYS[2], ARGV[3], ARGV[2])
|
|
redis.call("ZREMRANGEBYSCORE", KEYS[2], "-inf", ARGV[4])
|
|
redis.call("ZREMRANGEBYRANK", KEYS[2], 0, -ARGV[5])
|
|
local n = redis.call("INCR", KEYS[3])
|
|
if tonumber(n) == 1 then
|
|
redis.call("EXPIREAT", KEYS[3], ARGV[6])
|
|
end
|
|
local m = redis.call("INCR", KEYS[4])
|
|
if tonumber(m) == 1 then
|
|
redis.call("EXPIREAT", KEYS[4], ARGV[6])
|
|
end
|
|
return redis.status_reply("OK")
|
|
`)
|
|
return script.Run(r.client,
|
|
[]string{base.InProgressQueue, base.DeadQueue, processedKey, failureKey},
|
|
string(bytesToRemove), string(bytesToAdd), now.Unix(), limit, maxDeadTasks, expireAt.Unix()).Err()
|
|
}
|
|
|
|
// RestoreUnfinished moves all tasks from in-progress list to the queue
|
|
// and reports the number of tasks restored.
|
|
func (r *RDB) RestoreUnfinished() (int64, error) {
|
|
script := redis.NewScript(`
|
|
local len = redis.call("LLEN", KEYS[1])
|
|
for i = len, 1, -1 do
|
|
redis.call("RPOPLPUSH", KEYS[1], KEYS[2])
|
|
end
|
|
return len
|
|
`)
|
|
res, err := script.Run(r.client, []string{base.InProgressQueue, base.DefaultQueue}).Result()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
n, ok := res.(int64)
|
|
if !ok {
|
|
return 0, fmt.Errorf("could not cast %v to int64", res)
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
// CheckAndEnqueue checks for all scheduled tasks and enqueues any tasks that
|
|
// have to be processed.
|
|
func (r *RDB) CheckAndEnqueue() error {
|
|
delayed := []string{base.ScheduledQueue, base.RetryQueue}
|
|
for _, zset := range delayed {
|
|
if err := r.forward(zset); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// forward moves all tasks with a score less than the current unix time
|
|
// from the given zset to the default queue.
|
|
func (r *RDB) forward(from string) error {
|
|
script := redis.NewScript(`
|
|
local msgs = redis.call("ZRANGEBYSCORE", KEYS[1], "-inf", ARGV[1])
|
|
for _, msg in ipairs(msgs) do
|
|
redis.call("ZREM", KEYS[1], msg)
|
|
local decoded = cjson.decode(msg)
|
|
local qkey = ARGV[2] .. decoded["Queue"]
|
|
redis.call("LPUSH", qkey, msg)
|
|
end
|
|
return msgs
|
|
`)
|
|
now := float64(time.Now().Unix())
|
|
return script.Run(r.client,
|
|
[]string{from, base.DefaultQueue}, now, base.QueuePrefix).Err()
|
|
}
|