mirror of
https://github.com/hibiken/asynq.git
synced 2024-11-10 11:31:58 +08:00
593 lines
18 KiB
Go
593 lines
18 KiB
Go
// Copyright 2020 Kentaro Hibino. All rights reserved.
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// Use of this source code is governed by a MIT license
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// that can be found in the LICENSE file.
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// Package rdb encapsulates the interactions with redis.
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package rdb
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strconv"
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"time"
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"github.com/go-redis/redis/v7"
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"github.com/hibiken/asynq/internal/base"
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"github.com/spf13/cast"
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)
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var (
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// ErrNoProcessableTask indicates that there are no tasks ready to be processed.
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ErrNoProcessableTask = errors.New("no tasks are ready for processing")
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// ErrTaskNotFound indicates that a task that matches the given identifier was not found.
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ErrTaskNotFound = errors.New("could not find a task")
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// ErrDuplicateTask indicates that another task with the same unique key holds the uniqueness lock.
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ErrDuplicateTask = errors.New("task already exists")
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)
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const statsTTL = 90 * 24 * time.Hour // 90 days
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// RDB is a client interface to query and mutate task queues.
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type RDB struct {
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client redis.UniversalClient
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}
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// NewRDB returns a new instance of RDB.
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func NewRDB(client redis.UniversalClient) *RDB {
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return &RDB{client}
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}
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// Close closes the connection with redis server.
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func (r *RDB) Close() error {
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return r.client.Close()
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}
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// Ping checks the connection with redis server.
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func (r *RDB) Ping() error {
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return r.client.Ping().Err()
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}
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// Enqueue inserts the given task to the tail of the queue.
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func (r *RDB) Enqueue(msg *base.TaskMessage) error {
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
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return err
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}
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key := base.QueueKey(msg.Queue)
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return r.client.LPush(key, encoded).Err()
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}
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// KEYS[1] -> unique key
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// KEYS[2] -> asynq:{<qname>}
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// ARGV[1] -> task ID
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// ARGV[2] -> uniqueness lock TTL
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// ARGV[3] -> task message data
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var enqueueUniqueCmd = redis.NewScript(`
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local ok = redis.call("SET", KEYS[1], ARGV[1], "NX", "EX", ARGV[2])
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if not ok then
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return 0
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end
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redis.call("LPUSH", KEYS[2], ARGV[3])
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return 1
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`)
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// EnqueueUnique inserts the given task if the task's uniqueness lock can be acquired.
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// It returns ErrDuplicateTask if the lock cannot be acquired.
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func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
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return err
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}
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res, err := enqueueUniqueCmd.Run(r.client,
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[]string{msg.UniqueKey, base.QueueKey(msg.Queue)},
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msg.ID.String(), int(ttl.Seconds()), encoded).Result()
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if err != nil {
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return err
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}
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n, ok := res.(int64)
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if !ok {
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return fmt.Errorf("could not cast %v to int64", res)
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}
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if n == 0 {
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return ErrDuplicateTask
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}
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return nil
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}
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// Dequeue queries given queues in order and pops a task message
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// off a queue if one exists and returns the message and deadline.
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// Dequeue skips a queue if the queue is paused.
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// If all queues are empty, ErrNoProcessableTask error is returned.
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func (r *RDB) Dequeue(qnames ...string) (msg *base.TaskMessage, deadline time.Time, err error) {
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data, d, err := r.dequeue(qnames...)
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if err != nil {
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return nil, time.Time{}, err
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}
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if msg, err = base.DecodeMessage(data); err != nil {
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return nil, time.Time{}, err
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}
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return msg, time.Unix(d, 0), nil
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}
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// KEYS[1] -> asynq:{<qname>}
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// KEYS[2] -> asynq:{<qname>}:paused
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// KEYS[3] -> asynq:{<qname>}:active
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// KEYS[4] -> asynq:{<qname>}:deadlines
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// ARGV[1] -> current time in Unix time
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//
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// dequeueCmd checks whether a queue is paused first, before
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// calling RPOPLPUSH to pop a task from the queue.
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// It computes the task deadline by inspecting Timout and Deadline fields,
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// and inserts the task with deadlines set.
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var dequeueCmd = redis.NewScript(`
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if redis.call("EXISTS", KEYS[2]) == 0 then
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local msg = redis.call("RPOPLPUSH", KEYS[1], KEYS[3])
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if msg then
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local decoded = cjson.decode(msg)
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local timeout = decoded["Timeout"]
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local deadline = decoded["Deadline"]
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local score
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if timeout ~= 0 and deadline ~= 0 then
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score = math.min(ARGV[1]+timeout, deadline)
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elseif timeout ~= 0 then
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score = ARGV[1] + timeout
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elseif deadline ~= 0 then
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score = deadline
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else
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return redis.error_reply("asynq internal error: both timeout and deadline are not set")
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end
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redis.call("ZADD", KEYS[4], score, msg)
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return {msg, score}
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end
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end
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return nil`)
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func (r *RDB) dequeue(qnames ...string) (msgjson string, deadline int64, err error) {
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for _, qname := range qnames {
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keys := []string{
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base.QueueKey(qname),
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base.PausedKey(qname),
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base.ActiveKey(qname),
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base.DeadlinesKey(qname),
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}
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res, err := dequeueCmd.Run(r.client, keys, time.Now().Unix()).Result()
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if err == redis.Nil {
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continue
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} else if err != nil {
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return "", 0, err
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}
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data, err := cast.ToSliceE(res)
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if err != nil {
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return "", 0, err
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}
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if len(data) != 2 {
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return "", 0, fmt.Errorf("asynq: internal error: dequeue command returned %d values", len(data))
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}
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if msgjson, err = cast.ToStringE(data[0]); err != nil {
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return "", 0, err
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}
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if deadline, err = cast.ToInt64E(data[1]); err != nil {
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return "", 0, err
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}
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return msgjson, deadline, nil
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}
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return "", 0, ErrNoProcessableTask
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}
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// KEYS[1] -> asynq:{<qname>}:active
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// KEYS[2] -> asynq:{<qname>}:deadlines
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// KEYS[3] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
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// ARGV[1] -> base.TaskMessage value
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// ARGV[2] -> stats expiration timestamp
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var doneCmd = redis.NewScript(`
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if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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local n = redis.call("INCR", KEYS[3])
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if tonumber(n) == 1 then
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redis.call("EXPIREAT", KEYS[3], ARGV[2])
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end
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return redis.status_reply("OK")
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`)
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// KEYS[1] -> asynq:{<qname>}:active
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// KEYS[2] -> asynq:{<qname>}:deadlines
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// KEYS[3] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
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// KEYS[4] -> unique key
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// ARGV[1] -> base.TaskMessage value
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// ARGV[2] -> stats expiration timestamp
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// ARGV[3] -> task ID
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var doneUniqueCmd = redis.NewScript(`
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if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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local n = redis.call("INCR", KEYS[3])
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if tonumber(n) == 1 then
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redis.call("EXPIREAT", KEYS[3], ARGV[2])
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end
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if redis.call("GET", KEYS[4]) == ARGV[3] then
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redis.call("DEL", KEYS[4])
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end
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return redis.status_reply("OK")
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`)
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// Done removes the task from active queue to mark the task as done.
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// It removes a uniqueness lock acquired by the task, if any.
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func (r *RDB) Done(msg *base.TaskMessage) error {
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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now := time.Now()
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expireAt := now.Add(statsTTL)
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keys := []string{
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base.ActiveKey(msg.Queue),
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base.DeadlinesKey(msg.Queue),
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base.ProcessedKey(msg.Queue, now),
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}
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args := []interface{}{encoded, expireAt.Unix()}
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if len(msg.UniqueKey) > 0 {
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keys = append(keys, msg.UniqueKey)
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args = append(args, msg.ID.String())
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return doneUniqueCmd.Run(r.client, keys, args...).Err()
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}
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return doneCmd.Run(r.client, keys, args...).Err()
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}
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// KEYS[1] -> asynq:{<qname>}:active
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// KEYS[2] -> asynq:{<qname>}:deadlines
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// KEYS[3] -> asynq:{<qname>}
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// ARGV[1] -> base.TaskMessage value
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// Note: Use RPUSH to push to the head of the queue.
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var requeueCmd = redis.NewScript(`
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if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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redis.call("RPUSH", KEYS[3], ARGV[1])
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return redis.status_reply("OK")`)
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// Requeue moves the task from active queue to the specified queue.
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func (r *RDB) Requeue(msg *base.TaskMessage) error {
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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return requeueCmd.Run(r.client,
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[]string{base.ActiveKey(msg.Queue), base.DeadlinesKey(msg.Queue), base.QueueKey(msg.Queue)},
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encoded).Err()
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}
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// Schedule adds the task to the backlog queue to be processed in the future.
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func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
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return err
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}
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score := float64(processAt.Unix())
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return r.client.ZAdd(base.ScheduledKey(msg.Queue), &redis.Z{Score: score, Member: encoded}).Err()
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}
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// KEYS[1] -> unique key
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// KEYS[2] -> asynq:{<qname>}:scheduled
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// ARGV[1] -> task ID
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// ARGV[2] -> uniqueness lock TTL
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// ARGV[3] -> score (process_at timestamp)
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// ARGV[4] -> task message
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var scheduleUniqueCmd = redis.NewScript(`
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local ok = redis.call("SET", KEYS[1], ARGV[1], "NX", "EX", ARGV[2])
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if not ok then
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return 0
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end
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redis.call("ZADD", KEYS[2], ARGV[3], ARGV[4])
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return 1
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`)
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// ScheduleUnique adds the task to the backlog queue to be processed in the future if the uniqueness lock can be acquired.
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// It returns ErrDuplicateTask if the lock cannot be acquired.
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func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
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return err
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}
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score := float64(processAt.Unix())
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res, err := scheduleUniqueCmd.Run(r.client,
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[]string{msg.UniqueKey, base.ScheduledKey(msg.Queue)},
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msg.ID.String(), int(ttl.Seconds()), score, encoded).Result()
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if err != nil {
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return err
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}
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n, ok := res.(int64)
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if !ok {
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return fmt.Errorf("could not cast %v to int64", res)
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}
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if n == 0 {
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return ErrDuplicateTask
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}
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return nil
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}
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// KEYS[1] -> asynq:{<qname>}:active
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// KEYS[2] -> asynq:{<qname>}:deadlines
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// KEYS[3] -> asynq:{<qname>}:retry
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// KEYS[4] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
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// KEYS[5] -> asynq:{<qname>}:failed:<yyyy-mm-dd>
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// ARGV[1] -> base.TaskMessage value to remove from base.ActiveQueue queue
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// ARGV[2] -> base.TaskMessage value to add to Retry queue
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// ARGV[3] -> retry_at UNIX timestamp
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// ARGV[4] -> stats expiration timestamp
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var retryCmd = redis.NewScript(`
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if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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redis.call("ZADD", KEYS[3], ARGV[3], ARGV[2])
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local n = redis.call("INCR", KEYS[4])
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if tonumber(n) == 1 then
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redis.call("EXPIREAT", KEYS[4], ARGV[4])
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end
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local m = redis.call("INCR", KEYS[5])
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if tonumber(m) == 1 then
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redis.call("EXPIREAT", KEYS[5], ARGV[4])
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end
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return redis.status_reply("OK")`)
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// Retry moves the task from active to retry queue, incrementing retry count
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// and assigning error message to the task message.
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func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) error {
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msgToRemove, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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modified := *msg
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modified.Retried++
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modified.ErrorMsg = errMsg
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msgToAdd, err := base.EncodeMessage(&modified)
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if err != nil {
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return err
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}
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now := time.Now()
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processedKey := base.ProcessedKey(msg.Queue, now)
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failedKey := base.FailedKey(msg.Queue, now)
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expireAt := now.Add(statsTTL)
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return retryCmd.Run(r.client,
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[]string{base.ActiveKey(msg.Queue), base.DeadlinesKey(msg.Queue), base.RetryKey(msg.Queue), processedKey, failedKey},
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msgToRemove, msgToAdd, processAt.Unix(), expireAt.Unix()).Err()
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}
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const (
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maxDeadTasks = 10000
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deadExpirationInDays = 90
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)
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// KEYS[1] -> asynq:{<qname>}:active
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// KEYS[2] -> asynq:{<qname>}:deadlines
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// KEYS[3] -> asynq:{<qname>}:dead
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// KEYS[4] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
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// KEYS[5] -> asynq:{<qname>}:failed:<yyyy-mm-dd>
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// ARGV[1] -> base.TaskMessage value to remove from base.ActiveQueue queue
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// ARGV[2] -> base.TaskMessage value to add to Dead queue
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// ARGV[3] -> died_at UNIX timestamp
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// ARGV[4] -> cutoff timestamp (e.g., 90 days ago)
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// ARGV[5] -> max number of tasks in dead queue (e.g., 100)
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// ARGV[6] -> stats expiration timestamp
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var killCmd = redis.NewScript(`
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if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
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return redis.error_reply("NOT FOUND")
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end
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redis.call("ZADD", KEYS[3], ARGV[3], ARGV[2])
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redis.call("ZREMRANGEBYSCORE", KEYS[3], "-inf", ARGV[4])
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redis.call("ZREMRANGEBYRANK", KEYS[3], 0, -ARGV[5])
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local n = redis.call("INCR", KEYS[4])
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if tonumber(n) == 1 then
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redis.call("EXPIREAT", KEYS[4], ARGV[6])
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end
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local m = redis.call("INCR", KEYS[5])
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if tonumber(m) == 1 then
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redis.call("EXPIREAT", KEYS[5], ARGV[6])
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end
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return redis.status_reply("OK")`)
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// Kill sends the task to "dead" queue from active queue, assigning
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// the error message to the task.
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// It also trims the set by timestamp and set size.
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func (r *RDB) Kill(msg *base.TaskMessage, errMsg string) error {
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msgToRemove, err := base.EncodeMessage(msg)
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if err != nil {
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return err
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}
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modified := *msg
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modified.ErrorMsg = errMsg
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msgToAdd, err := base.EncodeMessage(&modified)
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if err != nil {
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return err
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}
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now := time.Now()
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limit := now.AddDate(0, 0, -deadExpirationInDays).Unix() // 90 days ago
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processedKey := base.ProcessedKey(msg.Queue, now)
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failedKey := base.FailedKey(msg.Queue, now)
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expireAt := now.Add(statsTTL)
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return killCmd.Run(r.client,
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[]string{base.ActiveKey(msg.Queue), base.DeadlinesKey(msg.Queue), base.DeadKey(msg.Queue), processedKey, failedKey},
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msgToRemove, msgToAdd, now.Unix(), limit, maxDeadTasks, expireAt.Unix()).Err()
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}
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// CheckAndEnqueue checks for scheduled/retry tasks for the given queues
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//and enqueues any tasks that are ready to be processed.
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func (r *RDB) CheckAndEnqueue(qnames ...string) error {
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for _, qname := range qnames {
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if err := r.forwardAll(base.ScheduledKey(qname), base.QueueKey(qname)); err != nil {
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return err
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}
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if err := r.forwardAll(base.RetryKey(qname), base.QueueKey(qname)); err != nil {
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return err
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}
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}
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return nil
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}
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// KEYS[1] -> source queue (e.g. asynq:{<qname>:scheduled or asynq:{<qname>}:retry})
|
|
// KEYS[2] -> destination queue (e.g. asynq:{<qname>})
|
|
// ARGV[1] -> current unix time
|
|
// Note: Script moves tasks up to 100 at a time to keep the runtime of script short.
|
|
var forwardCmd = redis.NewScript(`
|
|
local msgs = redis.call("ZRANGEBYSCORE", KEYS[1], "-inf", ARGV[1], "LIMIT", 0, 100)
|
|
for _, msg in ipairs(msgs) do
|
|
redis.call("LPUSH", KEYS[2], msg)
|
|
redis.call("ZREM", KEYS[1], msg)
|
|
end
|
|
return table.getn(msgs)`)
|
|
|
|
// forward moves tasks with a score less than the current unix time
|
|
// from the src zset to the dst list. It returns the number of tasks moved.
|
|
func (r *RDB) forward(src, dst string) (int, error) {
|
|
now := float64(time.Now().Unix())
|
|
res, err := forwardCmd.Run(r.client, []string{src, dst}, now).Result()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return cast.ToInt(res), nil
|
|
}
|
|
|
|
// forwardAll moves tasks with a score less than the current unix time from the src zset,
|
|
// until there's no more tasks.
|
|
func (r *RDB) forwardAll(src, dst string) (err error) {
|
|
n := 1
|
|
for n != 0 {
|
|
n, err = r.forward(src, dst)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ListDeadlineExceeded returns a list of task messages that have exceeded the deadline from the given queues.
|
|
func (r *RDB) ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*base.TaskMessage, error) {
|
|
var msgs []*base.TaskMessage
|
|
opt := &redis.ZRangeBy{
|
|
Min: "-inf",
|
|
Max: strconv.FormatInt(deadline.Unix(), 10),
|
|
}
|
|
for _, qname := range qnames {
|
|
res, err := r.client.ZRangeByScore(base.DeadlinesKey(qname), opt).Result()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, s := range res {
|
|
msg, err := base.DecodeMessage(s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
msgs = append(msgs, msg)
|
|
}
|
|
}
|
|
return msgs, nil
|
|
}
|
|
|
|
// KEYS[1] -> asynq:servers:{<host:pid:sid>}
|
|
// KEYS[2] -> asynq:workers:{<host:pid:sid>}
|
|
// ARGV[1] -> TTL in seconds
|
|
// ARGV[2] -> server info
|
|
// ARGV[3:] -> alternate key-value pair of (worker id, worker data)
|
|
// Note: Add key to ZSET with expiration time as score.
|
|
// ref: https://github.com/antirez/redis/issues/135#issuecomment-2361996
|
|
var writeServerStateCmd = redis.NewScript(`
|
|
redis.call("SETEX", KEYS[1], ARGV[1], ARGV[2])
|
|
redis.call("DEL", KEYS[2])
|
|
for i = 3, table.getn(ARGV)-1, 2 do
|
|
redis.call("HSET", KEYS[2], ARGV[i], ARGV[i+1])
|
|
end
|
|
redis.call("EXPIRE", KEYS[2], ARGV[1])
|
|
return redis.status_reply("OK")`)
|
|
|
|
// WriteServerState writes server state data to redis with expiration set to the value ttl.
|
|
func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo, ttl time.Duration) error {
|
|
bytes, err := json.Marshal(info)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
exp := time.Now().Add(ttl).UTC()
|
|
args := []interface{}{ttl.Seconds(), bytes} // args to the lua script
|
|
for _, w := range workers {
|
|
bytes, err := json.Marshal(w)
|
|
if err != nil {
|
|
continue // skip bad data
|
|
}
|
|
args = append(args, w.ID, bytes)
|
|
}
|
|
skey := base.ServerInfoKey(info.Host, info.PID, info.ServerID)
|
|
wkey := base.WorkersKey(info.Host, info.PID, info.ServerID)
|
|
if err := r.client.ZAdd(base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
|
|
return err
|
|
}
|
|
if err := r.client.ZAdd(base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
|
|
return err
|
|
}
|
|
return writeServerStateCmd.Run(r.client, []string{skey, wkey}, args...).Err()
|
|
}
|
|
|
|
// KEYS[1] -> asynq:servers:{<host:pid:sid>}
|
|
// KEYS[2] -> asynq:workers:{<host:pid:sid>}
|
|
var clearServerStateCmd = redis.NewScript(`
|
|
redis.call("DEL", KEYS[1])
|
|
redis.call("DEL", KEYS[2])
|
|
return redis.status_reply("OK")`)
|
|
|
|
// ClearServerState deletes server state data from redis.
|
|
func (r *RDB) ClearServerState(host string, pid int, serverID string) error {
|
|
skey := base.ServerInfoKey(host, pid, serverID)
|
|
wkey := base.WorkersKey(host, pid, serverID)
|
|
if err := r.client.ZRem(base.AllServers, skey).Err(); err != nil {
|
|
return err
|
|
}
|
|
if err := r.client.ZRem(base.AllWorkers, wkey).Err(); err != nil {
|
|
return err
|
|
}
|
|
return clearServerStateCmd.Run(r.client, []string{skey, wkey}).Err()
|
|
}
|
|
|
|
// CancelationPubSub returns a pubsub for cancelation messages.
|
|
func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
|
|
pubsub := r.client.Subscribe(base.CancelChannel)
|
|
_, err := pubsub.Receive()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return pubsub, nil
|
|
}
|
|
|
|
// PublishCancelation publish cancelation message to all subscribers.
|
|
// The message is the ID for the task to be canceled.
|
|
func (r *RDB) PublishCancelation(id string) error {
|
|
return r.client.Publish(base.CancelChannel, id).Err()
|
|
}
|