mirror of
https://github.com/hibiken/asynq.git
synced 2024-12-27 16:13:40 +08:00
852 lines
28 KiB
Go
852 lines
28 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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"fmt"
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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/hibiken/asynq/internal/errors"
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"github.com/spf13/cast"
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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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func (r *RDB) runScript(op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
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if err := script.Run(r.client, keys, args...).Err(); err != nil {
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return errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
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}
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return nil
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}
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// enqueueCmd enqueues a given task message.
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//
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// Input:
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// KEYS[1] -> asynq:{<qname>}:t:<task_id>
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// KEYS[2] -> asynq:{<qname>}:pending
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// --
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// ARGV[1] -> task message data
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// ARGV[2] -> task ID
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// ARGV[3] -> task timeout in seconds (0 if not timeout)
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// ARGV[4] -> task deadline in unix time (0 if no deadline)
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//
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// Output:
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// Returns 1 if successfully enqueued
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var enqueueCmd = redis.NewScript(`
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redis.call("HSET", KEYS[1],
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"msg", ARGV[1],
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"state", "pending",
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"timeout", ARGV[3],
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"deadline", ARGV[4])
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redis.call("LPUSH", KEYS[2], ARGV[2])
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return 1
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`)
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// Enqueue adds the given task to the pending list of the queue.
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func (r *RDB) Enqueue(msg *base.TaskMessage) error {
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var op errors.Op = "rdb.Enqueue"
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", 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 errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
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}
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keys := []string{
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base.TaskKey(msg.Queue, msg.ID.String()),
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base.PendingKey(msg.Queue),
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}
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argv := []interface{}{
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encoded,
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msg.ID.String(),
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msg.Timeout,
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msg.Deadline,
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}
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return r.runScript(op, enqueueCmd, keys, argv...)
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}
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// enqueueUniqueCmd enqueues the task message if the task is unique.
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//
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// KEYS[1] -> unique key
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// KEYS[2] -> asynq:{<qname>}:t:<taskid>
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// KEYS[3] -> asynq:{<qname>}:pending
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// --
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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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// ARGV[4] -> task timeout in seconds (0 if not timeout)
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// ARGV[5] -> task deadline in unix time (0 if no deadline)
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//
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// Output:
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// Returns 1 if successfully enqueued
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// Returns 0 if task already exists
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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("HSET", KEYS[2],
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"msg", ARGV[3],
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"state", "pending",
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"timeout", ARGV[4],
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"deadline", ARGV[5],
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"unique_key", KEYS[1])
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redis.call("LPUSH", KEYS[3], ARGV[1])
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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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var op errors.Op = "rdb.EnqueueUnique"
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return errors.E(op, errors.Internal, "cannot encode task message: %v", 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 errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
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}
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keys := []string{
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msg.UniqueKey,
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base.TaskKey(msg.Queue, msg.ID.String()),
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base.PendingKey(msg.Queue),
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}
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argv := []interface{}{
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msg.ID.String(),
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int(ttl.Seconds()),
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encoded,
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msg.Timeout,
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msg.Deadline,
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}
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res, err := enqueueUniqueCmd.Run(r.client, keys, argv...).Result()
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if err != nil {
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return errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
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}
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n, ok := res.(int64)
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if !ok {
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return errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from Lua script: %v", res))
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}
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if n == 0 {
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return errors.E(op, errors.AlreadyExists, errors.ErrDuplicateTask)
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}
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return nil
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}
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// Input:
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// KEYS[1] -> asynq:{<qname>}:pending
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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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// --
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// ARGV[1] -> current time in Unix time
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// ARGV[2] -> task key prefix
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//
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// Output:
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// Returns nil if no processable task is found in the given queue.
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// Returns tuple {msg , deadline} if task is found, where `msg` is the encoded
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// TaskMessage, and `deadline` is Unix time in seconds.
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//
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// Note: 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 to the deadlines zset with the computed deadline.
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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 id = redis.call("RPOPLPUSH", KEYS[1], KEYS[3])
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if id then
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local key = ARGV[2] .. id
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redis.call("HSET", key, "state", "active")
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local data = redis.call("HMGET", key, "msg", "timeout", "deadline")
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local msg = data[1]
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local timeout = tonumber(data[2])
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local deadline = tonumber(data[3])
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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, id)
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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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// 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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var op errors.Op = "rdb.Dequeue"
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for _, qname := range qnames {
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keys := []string{
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base.PendingKey(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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argv := []interface{}{
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time.Now().Unix(),
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base.TaskKeyPrefix(qname),
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}
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res, err := dequeueCmd.Run(r.client, keys, argv...).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 nil, time.Time{}, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", 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 nil, time.Time{}, errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
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}
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if len(data) != 2 {
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return nil, time.Time{}, errors.E(op, errors.Internal, fmt.Sprintf("Lua script returned %d values; expected 2", len(data)))
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}
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encoded, err := cast.ToStringE(data[0])
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if err != nil {
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return nil, time.Time{}, errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
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}
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d, err := cast.ToInt64E(data[1])
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if err != nil {
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return nil, time.Time{}, errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
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}
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if msg, err = base.DecodeMessage([]byte(encoded)); err != nil {
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return nil, time.Time{}, errors.E(op, errors.Internal, fmt.Sprintf("cannot decode message: %v", err))
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}
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return msg, time.Unix(d, 0), nil
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}
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return nil, time.Time{}, errors.E(op, errors.NotFound, errors.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>}:t:<task_id>
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// KEYS[4] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
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// ARGV[1] -> task ID
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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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if redis.call("DEL", KEYS[3]) == 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[4])
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if tonumber(n) == 1 then
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redis.call("EXPIREAT", KEYS[4], 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>}:t:<task_id>
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// KEYS[4] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
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// KEYS[5] -> unique key
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// ARGV[1] -> task ID
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// ARGV[2] -> stats expiration timestamp
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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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if redis.call("DEL", KEYS[3]) == 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[4])
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if tonumber(n) == 1 then
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redis.call("EXPIREAT", KEYS[4], ARGV[2])
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end
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if redis.call("GET", KEYS[5]) == ARGV[1] then
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redis.call("DEL", KEYS[5])
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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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var op errors.Op = "rdb.Done"
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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.TaskKey(msg.Queue, msg.ID.String()),
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base.ProcessedKey(msg.Queue, now),
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}
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argv := []interface{}{
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msg.ID.String(),
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expireAt.Unix(),
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}
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if len(msg.UniqueKey) > 0 {
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keys = append(keys, msg.UniqueKey)
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return r.runScript(op, doneUniqueCmd, keys, argv...)
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}
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return r.runScript(op, doneCmd, keys, argv...)
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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>}:pending
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// KEYS[4] -> asynq:{<qname>}:t:<task_id>
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// ARGV[1] -> task ID
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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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redis.call("HSET", KEYS[4], "state", "pending")
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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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var op errors.Op = "rdb.Requeue"
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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.PendingKey(msg.Queue),
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base.TaskKey(msg.Queue, msg.ID.String()),
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}
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return r.runScript(op, requeueCmd, keys, msg.ID.String())
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}
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// KEYS[1] -> asynq:{<qname>}:t:<task_id>
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// KEYS[2] -> asynq:{<qname>}:scheduled
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// ARGV[1] -> task message data
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// ARGV[2] -> process_at time in Unix time
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// ARGV[3] -> task ID
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// ARGV[4] -> task timeout in seconds (0 if not timeout)
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// ARGV[5] -> task deadline in unix time (0 if no deadline)
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var scheduleCmd = redis.NewScript(`
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redis.call("HSET", KEYS[1],
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"msg", ARGV[1],
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"state", "scheduled",
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"timeout", ARGV[4],
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"deadline", ARGV[5])
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redis.call("ZADD", KEYS[2], ARGV[2], ARGV[3])
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return 1
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`)
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// Schedule adds the task to the scheduled set 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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var op errors.Op = "rdb.Schedule"
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", 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 errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
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}
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keys := []string{
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base.TaskKey(msg.Queue, msg.ID.String()),
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base.ScheduledKey(msg.Queue),
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}
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argv := []interface{}{
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encoded,
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processAt.Unix(),
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msg.ID.String(),
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msg.Timeout,
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msg.Deadline,
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}
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return r.runScript(op, scheduleCmd, keys, argv...)
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}
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// KEYS[1] -> unique key
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// KEYS[2] -> asynq:{<qname>}:t:<task_id>
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// KEYS[3] -> 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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// ARGV[5] -> task timeout in seconds (0 if not timeout)
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// ARGV[6] -> task deadline in unix time (0 if no deadline)
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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("HSET", KEYS[2],
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"msg", ARGV[4],
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"state", "scheduled",
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"timeout", ARGV[5],
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"deadline", ARGV[6],
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"unique_key", KEYS[1])
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redis.call("ZADD", KEYS[3], ARGV[3], ARGV[1])
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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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var op errors.Op = "rdb.ScheduleUnique"
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encoded, err := base.EncodeMessage(msg)
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if err != nil {
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return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode task message: %v", 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 errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
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}
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keys := []string{
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msg.UniqueKey,
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base.TaskKey(msg.Queue, msg.ID.String()),
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base.ScheduledKey(msg.Queue),
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}
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argv := []interface{}{
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msg.ID.String(),
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int(ttl.Seconds()),
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processAt.Unix(),
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encoded,
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msg.Timeout,
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msg.Deadline,
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}
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res, err := scheduleUniqueCmd.Run(r.client, keys, argv...).Result()
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if err != nil {
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return errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
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}
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n, ok := res.(int64)
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if !ok {
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return errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
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}
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if n == 0 {
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return errors.E(op, errors.AlreadyExists, errors.ErrDuplicateTask)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// KEYS[1] -> asynq:{<qname>}:t:<task_id>
|
|
// KEYS[2] -> asynq:{<qname>}:active
|
|
// KEYS[3] -> asynq:{<qname>}:deadlines
|
|
// KEYS[4] -> asynq:{<qname>}:retry
|
|
// KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
|
|
// KEYS[6] -> asynq:{<qname>}:failed:<yyyy-mm-dd>
|
|
// ARGV[1] -> task ID
|
|
// ARGV[2] -> updated base.TaskMessage value
|
|
// ARGV[3] -> retry_at UNIX timestamp
|
|
// ARGV[4] -> stats expiration timestamp
|
|
var retryCmd = redis.NewScript(`
|
|
if redis.call("LREM", KEYS[2], 0, ARGV[1]) == 0 then
|
|
return redis.error_reply("NOT FOUND")
|
|
end
|
|
if redis.call("ZREM", KEYS[3], ARGV[1]) == 0 then
|
|
return redis.error_reply("NOT FOUND")
|
|
end
|
|
redis.call("ZADD", KEYS[4], ARGV[3], ARGV[1])
|
|
redis.call("HSET", KEYS[1], "msg", ARGV[2], "state", "retry")
|
|
local n = redis.call("INCR", KEYS[5])
|
|
if tonumber(n) == 1 then
|
|
redis.call("EXPIREAT", KEYS[5], ARGV[4])
|
|
end
|
|
local m = redis.call("INCR", KEYS[6])
|
|
if tonumber(m) == 1 then
|
|
redis.call("EXPIREAT", KEYS[6], ARGV[4])
|
|
end
|
|
return redis.status_reply("OK")`)
|
|
|
|
// Retry moves the task from active 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 {
|
|
var op errors.Op = "rdb.Retry"
|
|
now := time.Now()
|
|
modified := *msg
|
|
modified.Retried++
|
|
modified.ErrorMsg = errMsg
|
|
modified.LastFailedAt = now.Unix()
|
|
encoded, err := base.EncodeMessage(&modified)
|
|
if err != nil {
|
|
return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode message: %v", err))
|
|
}
|
|
expireAt := now.Add(statsTTL)
|
|
keys := []string{
|
|
base.TaskKey(msg.Queue, msg.ID.String()),
|
|
base.ActiveKey(msg.Queue),
|
|
base.DeadlinesKey(msg.Queue),
|
|
base.RetryKey(msg.Queue),
|
|
base.ProcessedKey(msg.Queue, now),
|
|
base.FailedKey(msg.Queue, now),
|
|
}
|
|
argv := []interface{}{
|
|
msg.ID.String(),
|
|
encoded,
|
|
processAt.Unix(),
|
|
expireAt.Unix(),
|
|
}
|
|
return r.runScript(op, retryCmd, keys, argv...)
|
|
}
|
|
|
|
const (
|
|
maxArchiveSize = 10000 // maximum number of tasks in archive
|
|
archivedExpirationInDays = 90 // number of days before an archived task gets deleted permanently
|
|
)
|
|
|
|
// KEYS[1] -> asynq:{<qname>}:t:<task_id>
|
|
// KEYS[2] -> asynq:{<qname>}:active
|
|
// KEYS[3] -> asynq:{<qname>}:deadlines
|
|
// KEYS[4] -> asynq:{<qname>}:archived
|
|
// KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
|
|
// KEYS[6] -> asynq:{<qname>}:failed:<yyyy-mm-dd>
|
|
// ARGV[1] -> task ID
|
|
// ARGV[2] -> updated base.TaskMessage value
|
|
// ARGV[3] -> died_at UNIX timestamp
|
|
// ARGV[4] -> cutoff timestamp (e.g., 90 days ago)
|
|
// ARGV[5] -> max number of tasks in archive (e.g., 100)
|
|
// ARGV[6] -> stats expiration timestamp
|
|
var archiveCmd = redis.NewScript(`
|
|
if redis.call("LREM", KEYS[2], 0, ARGV[1]) == 0 then
|
|
return redis.error_reply("NOT FOUND")
|
|
end
|
|
if redis.call("ZREM", KEYS[3], ARGV[1]) == 0 then
|
|
return redis.error_reply("NOT FOUND")
|
|
end
|
|
redis.call("ZADD", KEYS[4], ARGV[3], ARGV[1])
|
|
redis.call("ZREMRANGEBYSCORE", KEYS[4], "-inf", ARGV[4])
|
|
redis.call("ZREMRANGEBYRANK", KEYS[4], 0, -ARGV[5])
|
|
redis.call("HSET", KEYS[1], "msg", ARGV[2], "state", "archived")
|
|
local n = redis.call("INCR", KEYS[5])
|
|
if tonumber(n) == 1 then
|
|
redis.call("EXPIREAT", KEYS[5], ARGV[6])
|
|
end
|
|
local m = redis.call("INCR", KEYS[6])
|
|
if tonumber(m) == 1 then
|
|
redis.call("EXPIREAT", KEYS[6], ARGV[6])
|
|
end
|
|
return redis.status_reply("OK")`)
|
|
|
|
// Archive sends the given task to archive, attaching the error message to the task.
|
|
// It also trims the archive by timestamp and set size.
|
|
func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
|
|
var op errors.Op = "rdb.Archive"
|
|
now := time.Now()
|
|
modified := *msg
|
|
modified.ErrorMsg = errMsg
|
|
modified.LastFailedAt = now.Unix()
|
|
encoded, err := base.EncodeMessage(&modified)
|
|
if err != nil {
|
|
return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode message: %v", err))
|
|
}
|
|
cutoff := now.AddDate(0, 0, -archivedExpirationInDays)
|
|
expireAt := now.Add(statsTTL)
|
|
keys := []string{
|
|
base.TaskKey(msg.Queue, msg.ID.String()),
|
|
base.ActiveKey(msg.Queue),
|
|
base.DeadlinesKey(msg.Queue),
|
|
base.ArchivedKey(msg.Queue),
|
|
base.ProcessedKey(msg.Queue, now),
|
|
base.FailedKey(msg.Queue, now),
|
|
}
|
|
argv := []interface{}{
|
|
msg.ID.String(),
|
|
encoded,
|
|
now.Unix(),
|
|
cutoff.Unix(),
|
|
maxArchiveSize,
|
|
expireAt.Unix(),
|
|
}
|
|
return r.runScript(op, archiveCmd, keys, argv...)
|
|
}
|
|
|
|
// ForwardIfReady checks scheduled and retry sets of the given queues
|
|
// and move any tasks that are ready to be processed to the pending set.
|
|
func (r *RDB) ForwardIfReady(qnames ...string) error {
|
|
var op errors.Op = "rdb.ForwardIfReady"
|
|
for _, qname := range qnames {
|
|
if err := r.forwardAll(qname); err != nil {
|
|
return errors.E(op, errors.CanonicalCode(err), err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// KEYS[1] -> source queue (e.g. asynq:{<qname>:scheduled or asynq:{<qname>}:retry})
|
|
// KEYS[2] -> asynq:{<qname>}:pending
|
|
// ARGV[1] -> current unix time
|
|
// ARGV[2] -> task key prefix
|
|
// Note: Script moves tasks up to 100 at a time to keep the runtime of script short.
|
|
var forwardCmd = redis.NewScript(`
|
|
local ids = redis.call("ZRANGEBYSCORE", KEYS[1], "-inf", ARGV[1], "LIMIT", 0, 100)
|
|
for _, id in ipairs(ids) do
|
|
redis.call("LPUSH", KEYS[2], id)
|
|
redis.call("ZREM", KEYS[1], id)
|
|
redis.call("HSET", ARGV[2] .. id, "state", "pending")
|
|
end
|
|
return table.getn(ids)`)
|
|
|
|
// 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, taskKeyPrefix string) (int, error) {
|
|
now := float64(time.Now().Unix())
|
|
res, err := forwardCmd.Run(r.client, []string{src, dst}, now, taskKeyPrefix).Result()
|
|
if err != nil {
|
|
return 0, errors.E(errors.Internal, fmt.Sprintf("redis eval error: %v", err))
|
|
}
|
|
n, err := cast.ToIntE(res)
|
|
if err != nil {
|
|
return 0, errors.E(errors.Internal, fmt.Sprintf("cast error: Lua script returned unexpected value: %v", res))
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
// forwardAll checks for tasks in scheduled/retry state that are ready to be run, and updates
|
|
// their state to "pending".
|
|
func (r *RDB) forwardAll(qname string) (err error) {
|
|
sources := []string{base.ScheduledKey(qname), base.RetryKey(qname)}
|
|
dst := base.PendingKey(qname)
|
|
taskKeyPrefix := base.TaskKeyPrefix(qname)
|
|
for _, src := range sources {
|
|
n := 1
|
|
for n != 0 {
|
|
n, err = r.forward(src, dst, taskKeyPrefix)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// KEYS[1] -> asynq:{<qname>}:deadlines
|
|
// ARGV[1] -> deadline in unix time
|
|
// ARGV[2] -> task key prefix
|
|
var listDeadlineExceededCmd = redis.NewScript(`
|
|
local res = {}
|
|
local ids = redis.call("ZRANGEBYSCORE", KEYS[1], "-inf", ARGV[1])
|
|
for _, id in ipairs(ids) do
|
|
local key = ARGV[2] .. id
|
|
table.insert(res, redis.call("HGET", key, "msg"))
|
|
end
|
|
return res
|
|
`)
|
|
|
|
// 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 op errors.Op = "rdb.ListDeadlineExceeded"
|
|
var msgs []*base.TaskMessage
|
|
for _, qname := range qnames {
|
|
res, err := listDeadlineExceededCmd.Run(r.client,
|
|
[]string{base.DeadlinesKey(qname)},
|
|
deadline.Unix(), base.TaskKeyPrefix(qname)).Result()
|
|
if err != nil {
|
|
return nil, errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
|
|
}
|
|
data, err := cast.ToStringSliceE(res)
|
|
if err != nil {
|
|
return nil, errors.E(op, errors.Internal, fmt.Sprintf("cast error: Lua script returned unexpected value: %v", res))
|
|
}
|
|
for _, s := range data {
|
|
msg, err := base.DecodeMessage([]byte(s))
|
|
if err != nil {
|
|
return nil, errors.E(op, errors.Internal, fmt.Sprintf("cannot decode message: %v", 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 {
|
|
var op errors.Op = "rdb.WriteServerState"
|
|
bytes, err := base.EncodeServerInfo(info)
|
|
if err != nil {
|
|
return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode server info: %v", err))
|
|
}
|
|
exp := time.Now().Add(ttl).UTC()
|
|
args := []interface{}{ttl.Seconds(), bytes} // args to the lua script
|
|
for _, w := range workers {
|
|
bytes, err := base.EncodeWorkerInfo(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 errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
|
|
}
|
|
if err := r.client.ZAdd(base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
|
|
return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
|
|
}
|
|
return r.runScript(op, writeServerStateCmd, []string{skey, wkey}, args...)
|
|
}
|
|
|
|
// 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 {
|
|
var op errors.Op = "rdb.ClearServerState"
|
|
skey := base.ServerInfoKey(host, pid, serverID)
|
|
wkey := base.WorkersKey(host, pid, serverID)
|
|
if err := r.client.ZRem(base.AllServers, skey).Err(); err != nil {
|
|
return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
|
|
}
|
|
if err := r.client.ZRem(base.AllWorkers, wkey).Err(); err != nil {
|
|
return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
|
|
}
|
|
return r.runScript(op, clearServerStateCmd, []string{skey, wkey})
|
|
}
|
|
|
|
// KEYS[1] -> asynq:schedulers:{<schedulerID>}
|
|
// ARGV[1] -> TTL in seconds
|
|
// ARGV[2:] -> schedler entries
|
|
var writeSchedulerEntriesCmd = redis.NewScript(`
|
|
redis.call("DEL", KEYS[1])
|
|
for i = 2, #ARGV do
|
|
redis.call("LPUSH", KEYS[1], ARGV[i])
|
|
end
|
|
redis.call("EXPIRE", KEYS[1], ARGV[1])
|
|
return redis.status_reply("OK")`)
|
|
|
|
// WriteSchedulerEntries writes scheduler entries data to redis with expiration set to the value ttl.
|
|
func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.SchedulerEntry, ttl time.Duration) error {
|
|
var op errors.Op = "rdb.WriteSchedulerEntries"
|
|
args := []interface{}{ttl.Seconds()}
|
|
for _, e := range entries {
|
|
bytes, err := base.EncodeSchedulerEntry(e)
|
|
if err != nil {
|
|
continue // skip bad data
|
|
}
|
|
args = append(args, bytes)
|
|
}
|
|
exp := time.Now().Add(ttl).UTC()
|
|
key := base.SchedulerEntriesKey(schedulerID)
|
|
err := r.client.ZAdd(base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
|
|
if err != nil {
|
|
return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
|
|
}
|
|
return r.runScript(op, writeSchedulerEntriesCmd, []string{key}, args...)
|
|
}
|
|
|
|
// ClearSchedulerEntries deletes scheduler entries data from redis.
|
|
func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
|
|
var op errors.Op = "rdb.ClearSchedulerEntries"
|
|
key := base.SchedulerEntriesKey(scheduelrID)
|
|
if err := r.client.ZRem(base.AllSchedulers, key).Err(); err != nil {
|
|
return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zrem", Err: err})
|
|
}
|
|
if err := r.client.Del(key).Err(); err != nil {
|
|
return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// CancelationPubSub returns a pubsub for cancelation messages.
|
|
func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
|
|
var op errors.Op = "rdb.CancelationPubSub"
|
|
pubsub := r.client.Subscribe(base.CancelChannel)
|
|
_, err := pubsub.Receive()
|
|
if err != nil {
|
|
return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub receive error: %v", 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 {
|
|
var op errors.Op = "rdb.PublishCancelation"
|
|
if err := r.client.Publish(base.CancelChannel, id).Err(); err != nil {
|
|
return errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub publish error: %v", err))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// KEYS[1] -> asynq:scheduler_history:<entryID>
|
|
// ARGV[1] -> enqueued_at timestamp
|
|
// ARGV[2] -> serialized SchedulerEnqueueEvent data
|
|
// ARGV[3] -> max number of events to be persisted
|
|
var recordSchedulerEnqueueEventCmd = redis.NewScript(`
|
|
redis.call("ZREMRANGEBYRANK", KEYS[1], 0, -ARGV[3])
|
|
redis.call("ZADD", KEYS[1], ARGV[1], ARGV[2])
|
|
return redis.status_reply("OK")`)
|
|
|
|
// Maximum number of enqueue events to store per entry.
|
|
const maxEvents = 1000
|
|
|
|
// RecordSchedulerEnqueueEvent records the time when the given task was enqueued.
|
|
func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerEnqueueEvent) error {
|
|
var op errors.Op = "rdb.RecordSchedulerEnqueueEvent"
|
|
data, err := base.EncodeSchedulerEnqueueEvent(event)
|
|
if err != nil {
|
|
return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode scheduler enqueue event: %v", err))
|
|
}
|
|
keys := []string{
|
|
base.SchedulerHistoryKey(entryID),
|
|
}
|
|
argv := []interface{}{
|
|
event.EnqueuedAt.Unix(),
|
|
data,
|
|
maxEvents,
|
|
}
|
|
return r.runScript(op, recordSchedulerEnqueueEventCmd, keys, argv...)
|
|
}
|
|
|
|
// ClearSchedulerHistory deletes the enqueue event history for the given scheduler entry.
|
|
func (r *RDB) ClearSchedulerHistory(entryID string) error {
|
|
var op errors.Op = "rdb.ClearSchedulerHistory"
|
|
key := base.SchedulerHistoryKey(entryID)
|
|
if err := r.client.Del(key).Err(); err != nil {
|
|
return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
|
|
}
|
|
return nil
|
|
}
|