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e6355bf3f5
asynq/internal/rdb/inspect.go
Ken Hibino e6355bf3f5 Use approximate memory usage for QueueInfo
2021-08-09 08:58:44 -07:00

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// Copyright 2020 Kentaro Hibino. All rights reserved.
// Use of this source code is governed by a MIT license
// that can be found in the LICENSE file.
package rdb
import (
"fmt"
"strings"
"time"
"github.com/go-redis/redis/v7"
"github.com/google/uuid"
"github.com/hibiken/asynq/internal/base"
"github.com/hibiken/asynq/internal/errors"
"github.com/spf13/cast"
)
// AllQueues returns a list of all queue names.
func (r *RDB) AllQueues() ([]string, error) {
return r.client.SMembers(base.AllQueues).Result()
}
// Stats represents a state of queues at a certain time.
type Stats struct {
// Name of the queue (e.g. "default", "critical").
Queue string
// MemoryUsage is the total number of bytes the queue and its tasks require
// to be stored in redis. It is an approximate memory usage value in bytes
// since the value is computed by sampling.
MemoryUsage int64
// Paused indicates whether the queue is paused.
// If true, tasks in the queue should not be processed.
Paused bool
// Size is the total number of tasks in the queue.
Size int
// Number of tasks in each state.
Pending int
Active int
Scheduled int
Retry int
Archived int
// Total number of tasks processed during the current date.
// The number includes both succeeded and failed tasks.
Processed int
// Total number of tasks failed during the current date.
Failed int
// Time this stats was taken.
Timestamp time.Time
}
// DailyStats holds aggregate data for a given day.
type DailyStats struct {
// Name of the queue (e.g. "default", "critical").
Queue string
// Total number of tasks processed during the given day.
// The number includes both succeeded and failed tasks.
Processed int
// Total number of tasks failed during the given day.
Failed int
// Date this stats was taken.
Time time.Time
}
// KEYS[1] -> asynq:<qname>
// KEYS[2] -> asynq:<qname>:active
// KEYS[3] -> asynq:<qname>:scheduled
// KEYS[4] -> asynq:<qname>:retry
// KEYS[5] -> asynq:<qname>:archived
// KEYS[6] -> asynq:<qname>:processed:<yyyy-mm-dd>
// KEYS[7] -> asynq:<qname>:failed:<yyyy-mm-dd>
// KEYS[8] -> asynq:<qname>:paused
var currentStatsCmd = redis.NewScript(`
local res = {}
table.insert(res, KEYS[1])
table.insert(res, redis.call("LLEN", KEYS[1]))
table.insert(res, KEYS[2])
table.insert(res, redis.call("LLEN", KEYS[2]))
table.insert(res, KEYS[3])
table.insert(res, redis.call("ZCARD", KEYS[3]))
table.insert(res, KEYS[4])
table.insert(res, redis.call("ZCARD", KEYS[4]))
table.insert(res, KEYS[5])
table.insert(res, redis.call("ZCARD", KEYS[5]))
local pcount = 0
local p = redis.call("GET", KEYS[6])
if p then
pcount = tonumber(p)
end
table.insert(res, KEYS[6])
table.insert(res, pcount)
local fcount = 0
local f = redis.call("GET", KEYS[7])
if f then
fcount = tonumber(f)
end
table.insert(res, KEYS[7])
table.insert(res, fcount)
table.insert(res, KEYS[8])
table.insert(res, redis.call("EXISTS", KEYS[8]))
return res`)
// CurrentStats returns a current state of the queues.
func (r *RDB) CurrentStats(qname string) (*Stats, error) {
var op errors.Op = "rdb.CurrentStats"
exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
if err != nil {
return nil, errors.E(op, errors.Unknown, err)
}
if !exists {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
now := time.Now()
res, err := currentStatsCmd.Run(r.client, []string{
base.PendingKey(qname),
base.ActiveKey(qname),
base.ScheduledKey(qname),
base.RetryKey(qname),
base.ArchivedKey(qname),
base.ProcessedKey(qname, now),
base.FailedKey(qname, now),
base.PausedKey(qname),
}).Result()
if err != nil {
return nil, errors.E(op, errors.Unknown, err)
}
data, err := cast.ToSliceE(res)
if err != nil {
return nil, errors.E(op, errors.Internal, "cast error: unexpected return value from Lua script")
}
stats := &Stats{
Queue: qname,
Timestamp: now,
}
size := 0
for i := 0; i < len(data); i += 2 {
key := cast.ToString(data[i])
val := cast.ToInt(data[i+1])
switch key {
case base.PendingKey(qname):
stats.Pending = val
size += val
case base.ActiveKey(qname):
stats.Active = val
size += val
case base.ScheduledKey(qname):
stats.Scheduled = val
size += val
case base.RetryKey(qname):
stats.Retry = val
size += val
case base.ArchivedKey(qname):
stats.Archived = val
size += val
case base.ProcessedKey(qname, now):
stats.Processed = val
case base.FailedKey(qname, now):
stats.Failed = val
case base.PausedKey(qname):
if val == 0 {
stats.Paused = false
} else {
stats.Paused = true
}
}
}
stats.Size = size
memusg, err := r.memoryUsage(qname)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
stats.MemoryUsage = memusg
return stats, nil
}
// Computes memory usage for the given queue by sampling tasks
// from each redis list/zset. Returns approximate memory usage value
// in bytes.
//
// KEYS[1] -> asynq:{qname}:active
// KEYS[2] -> asynq:{qname}:pending
// KEYS[3] -> asynq:{qname}:scheduled
// KEYS[4] -> asynq:{qname}:retry
// KEYS[5] -> asynq:{qname}:archived
//
// ARGV[1] -> asynq:{qname}:t:
// ARGV[2] -> sample_size (e.g 20)
var memoryUsageCmd = redis.NewScript(`
local sample_size = tonumber(ARGV[2])
if sample_size <= 0 then
return redis.error_reply("sample size must be a positive number")
end
local memusg = 0
for i=1,2 do
local ids = redis.call("LRANGE", KEYS[i], 0, sample_size - 1)
local sample_total = 0
if (table.getn(ids) > 0) then
for _, id in ipairs(ids) do
local bytes = redis.call("MEMORY", "USAGE", ARGV[1] .. id)
sample_total = sample_total + bytes
end
local n = redis.call("LLEN", KEYS[i])
local avg = sample_total / table.getn(ids)
memusg = memusg + (avg * n)
end
local m = redis.call("MEMORY", "USAGE", KEYS[i])
if (m) then
memusg = memusg + m
end
end
for i=3,5 do
local ids = redis.call("ZRANGE", KEYS[i], 0, sample_size - 1)
local sample_total = 0
if (table.getn(ids) > 0) then
for _, id in ipairs(ids) do
local bytes = redis.call("MEMORY", "USAGE", ARGV[1] .. id)
sample_total = sample_total + bytes
end
local n = redis.call("ZCARD", KEYS[i])
local avg = sample_total / table.getn(ids)
memusg = memusg + (avg * n)
end
local m = redis.call("MEMORY", "USAGE", KEYS[i])
if (m) then
memusg = memusg + m
end
end
return memusg
`)
func (r *RDB) memoryUsage(qname string) (int64, error) {
var op errors.Op = "rdb.memoryUsage"
const sampleSize = 20
keys := []string{
base.ActiveKey(qname),
base.PendingKey(qname),
base.ScheduledKey(qname),
base.RetryKey(qname),
base.ArchivedKey(qname),
}
argv := []interface{}{
base.TaskKeyPrefix(qname),
sampleSize,
}
res, err := memoryUsageCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return 0, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
}
usg, err := cast.ToInt64E(res)
if err != nil {
return 0, errors.E(op, errors.Internal, fmt.Sprintf("could not cast script return value to int64"))
}
return usg, nil
}
var historicalStatsCmd = redis.NewScript(`
local res = {}
for _, key in ipairs(KEYS) do
local n = redis.call("GET", key)
if not n then
n = 0
end
table.insert(res, tonumber(n))
end
return res`)
// HistoricalStats returns a list of stats from the last n days for the given queue.
func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
var op errors.Op = "rdb.HistoricalStats"
if n < 1 {
return nil, errors.E(op, errors.FailedPrecondition, "the number of days must be positive")
}
exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
if err != nil {
return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
}
if !exists {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
const day = 24 * time.Hour
now := time.Now().UTC()
var days []time.Time
var keys []string
for i := 0; i < n; i++ {
ts := now.Add(-time.Duration(i) * day)
days = append(days, ts)
keys = append(keys, base.ProcessedKey(qname, ts))
keys = append(keys, base.FailedKey(qname, ts))
}
res, err := historicalStatsCmd.Run(r.client, keys).Result()
if err != nil {
return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
}
data, err := cast.ToIntSliceE(res)
if err != nil {
return nil, errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
}
var stats []*DailyStats
for i := 0; i < len(data); i += 2 {
stats = append(stats, &DailyStats{
Queue: qname,
Processed: data[i],
Failed: data[i+1],
Time: days[i/2],
})
}
return stats, nil
}
// RedisInfo returns a map of redis info.
func (r *RDB) RedisInfo() (map[string]string, error) {
res, err := r.client.Info().Result()
if err != nil {
return nil, err
}
return parseInfo(res)
}
// RedisClusterInfo returns a map of redis cluster info.
func (r *RDB) RedisClusterInfo() (map[string]string, error) {
res, err := r.client.ClusterInfo().Result()
if err != nil {
return nil, err
}
return parseInfo(res)
}
func parseInfo(infoStr string) (map[string]string, error) {
info := make(map[string]string)
lines := strings.Split(infoStr, "\r\n")
for _, l := range lines {
kv := strings.Split(l, ":")
if len(kv) == 2 {
info[kv[0]] = kv[1]
}
}
return info, nil
}
func reverse(x []string) {
for i := len(x)/2 - 1; i >= 0; i-- {
opp := len(x) - 1 - i
x[i], x[opp] = x[opp], x[i]
}
}
// checkQueueExists verifies whether the queue exists.
// It returns QueueNotFoundError if queue doesn't exist.
func (r *RDB) checkQueueExists(qname string) error {
exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
if err != nil {
return errors.E(errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
}
if !exists {
return errors.E(errors.Internal, &errors.QueueNotFoundError{Queue: qname})
}
return nil
}
// Input:
// KEYS[1] -> task key (asynq:{<qname>}:t:<taskid>)
// ARGV[1] -> task id
// ARGV[2] -> current time in Unix time (seconds)
// ARGV[3] -> queue key prefix (asynq:{<qname>}:)
//
// Output:
// Tuple of {msg, state, nextProcessAt}
// msg: encoded task message
// state: string describing the state of the task
// nextProcessAt: unix time in seconds, zero if not applicable.
//
// If the task key doesn't exist, it returns error with a message "NOT FOUND"
var getTaskInfoCmd = redis.NewScript(`
if redis.call("EXISTS", KEYS[1]) == 0 then
return redis.error_reply("NOT FOUND")
end
local msg, state = unpack(redis.call("HMGET", KEYS[1], "msg", "state"))
if state == "scheduled" or state == "retry" then
return {msg, state, redis.call("ZSCORE", ARGV[3] .. state, ARGV[1])}
end
if state == "pending" then
return {msg, state, ARGV[2]}
end
return {msg, state, 0}
`)
// GetTaskInfo returns a TaskInfo describing the task from the given queue.
func (r *RDB) GetTaskInfo(qname string, id uuid.UUID) (*base.TaskInfo, error) {
var op errors.Op = "rdb.GetTaskInfo"
if err := r.checkQueueExists(qname); err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
keys := []string{base.TaskKey(qname, id.String())}
argv := []interface{}{
id.String(),
time.Now().Unix(),
base.QueueKeyPrefix(qname),
}
res, err := getTaskInfoCmd.Run(r.client, keys, argv...).Result()
if err != nil {
if err.Error() == "NOT FOUND" {
return nil, errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
}
return nil, errors.E(op, errors.Unknown, err)
}
vals, err := cast.ToSliceE(res)
if err != nil {
return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
}
if len(vals) != 3 {
return nil, errors.E(op, errors.Internal, "unepxected number of values returned from Lua script")
}
encoded, err := cast.ToStringE(vals[0])
if err != nil {
return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
}
stateStr, err := cast.ToStringE(vals[1])
if err != nil {
return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
}
processAtUnix, err := cast.ToInt64E(vals[2])
if err != nil {
return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
}
msg, err := base.DecodeMessage([]byte(encoded))
if err != nil {
return nil, errors.E(op, errors.Internal, "could not decode task message")
}
state, err := base.TaskStateFromString(stateStr)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
var nextProcessAt time.Time
if processAtUnix != 0 {
nextProcessAt = time.Unix(processAtUnix, 0)
}
return &base.TaskInfo{
Message: msg,
State: state,
NextProcessAt: nextProcessAt,
}, nil
}
// Pagination specifies the page size and page number
// for the list operation.
type Pagination struct {
// Number of items in the page.
Size int
// Page number starting from zero.
Page int
}
func (p Pagination) start() int64 {
return int64(p.Size * p.Page)
}
func (p Pagination) stop() int64 {
return int64(p.Size*p.Page + p.Size - 1)
}
// ListPending returns pending tasks that are ready to be processed.
func (r *RDB) ListPending(qname string, pgn Pagination) ([]*base.TaskMessage, error) {
var op errors.Op = "rdb.ListPending"
if !r.client.SIsMember(base.AllQueues, qname).Val() {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
res, err := r.listMessages(base.PendingKey(qname), qname, pgn)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
return res, nil
}
// ListActive returns all tasks that are currently being processed for the given queue.
func (r *RDB) ListActive(qname string, pgn Pagination) ([]*base.TaskMessage, error) {
var op errors.Op = "rdb.ListActive"
if !r.client.SIsMember(base.AllQueues, qname).Val() {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
res, err := r.listMessages(base.ActiveKey(qname), qname, pgn)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
return res, nil
}
// KEYS[1] -> key for id list (e.g. asynq:{<qname>}:pending)
// ARGV[1] -> start offset
// ARGV[2] -> stop offset
// ARGV[3] -> task key prefix
var listMessagesCmd = redis.NewScript(`
local ids = redis.call("LRange", KEYS[1], ARGV[1], ARGV[2])
local res = {}
for _, id in ipairs(ids) do
local key = ARGV[3] .. id
table.insert(res, redis.call("HGET", key, "msg"))
end
return res
`)
// listMessages returns a list of TaskMessage in Redis list with the given key.
func (r *RDB) listMessages(key, qname string, pgn Pagination) ([]*base.TaskMessage, error) {
// Note: Because we use LPUSH to redis list, we need to calculate the
// correct range and reverse the list to get the tasks with pagination.
stop := -pgn.start() - 1
start := -pgn.stop() - 1
res, err := listMessagesCmd.Run(r.client,
[]string{key}, start, stop, base.TaskKeyPrefix(qname)).Result()
if err != nil {
return nil, errors.E(errors.Unknown, err)
}
data, err := cast.ToStringSliceE(res)
if err != nil {
return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
}
reverse(data)
var msgs []*base.TaskMessage
for _, s := range data {
m, err := base.DecodeMessage([]byte(s))
if err != nil {
continue // bad data, ignore and continue
}
msgs = append(msgs, m)
}
return msgs, nil
}
// ListScheduled returns all tasks from the given queue that are scheduled
// to be processed in the future.
func (r *RDB) ListScheduled(qname string, pgn Pagination) ([]base.Z, error) {
var op errors.Op = "rdb.ListScheduled"
if !r.client.SIsMember(base.AllQueues, qname).Val() {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
res, err := r.listZSetEntries(base.ScheduledKey(qname), qname, pgn)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
return res, nil
}
// ListRetry returns all tasks from the given queue that have failed before
// and willl be retried in the future.
func (r *RDB) ListRetry(qname string, pgn Pagination) ([]base.Z, error) {
var op errors.Op = "rdb.ListRetry"
if !r.client.SIsMember(base.AllQueues, qname).Val() {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
res, err := r.listZSetEntries(base.RetryKey(qname), qname, pgn)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
return res, nil
}
// ListArchived returns all tasks from the given queue that have exhausted its retry limit.
func (r *RDB) ListArchived(qname string, pgn Pagination) ([]base.Z, error) {
var op errors.Op = "rdb.ListArchived"
if !r.client.SIsMember(base.AllQueues, qname).Val() {
return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
zs, err := r.listZSetEntries(base.ArchivedKey(qname), qname, pgn)
if err != nil {
return nil, errors.E(op, errors.CanonicalCode(err), err)
}
return zs, nil
}
// KEYS[1] -> key for ids set (e.g. asynq:{<qname>}:scheduled)
// ARGV[1] -> min
// ARGV[2] -> max
// ARGV[3] -> task key prefix
//
// Returns an array populated with
// [msg1, score1, msg2, score2, ..., msgN, scoreN]
var listZSetEntriesCmd = redis.NewScript(`
local res = {}
local id_score_pairs = redis.call("ZRANGE", KEYS[1], ARGV[1], ARGV[2], "WITHSCORES")
for i = 1, table.getn(id_score_pairs), 2 do
local key = ARGV[3] .. id_score_pairs[i]
table.insert(res, redis.call("HGET", key, "msg"))
table.insert(res, id_score_pairs[i+1])
end
return res
`)
// listZSetEntries returns a list of message and score pairs in Redis sorted-set
// with the given key.
func (r *RDB) listZSetEntries(key, qname string, pgn Pagination) ([]base.Z, error) {
res, err := listZSetEntriesCmd.Run(r.client, []string{key},
pgn.start(), pgn.stop(), base.TaskKeyPrefix(qname)).Result()
if err != nil {
return nil, errors.E(errors.Unknown, err)
}
data, err := cast.ToSliceE(res)
if err != nil {
return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
}
var zs []base.Z
for i := 0; i < len(data); i += 2 {
s, err := cast.ToStringE(data[i])
if err != nil {
return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
}
score, err := cast.ToInt64E(data[i+1])
if err != nil {
return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
}
msg, err := base.DecodeMessage([]byte(s))
if err != nil {
continue // bad data, ignore and continue
}
zs = append(zs, base.Z{Message: msg, Score: score})
}
return zs, nil
}
// RunAllScheduledTasks enqueues all scheduled tasks from the given queue
// and returns the number of tasks enqueued.
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
func (r *RDB) RunAllScheduledTasks(qname string) (int64, error) {
var op errors.Op = "rdb.RunAllScheduledTasks"
n, err := r.runAll(base.ScheduledKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
return n, nil
}
// RunAllRetryTasks enqueues all retry tasks from the given queue
// and returns the number of tasks enqueued.
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
func (r *RDB) RunAllRetryTasks(qname string) (int64, error) {
var op errors.Op = "rdb.RunAllRetryTasks"
n, err := r.runAll(base.RetryKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
return n, nil
}
// RunAllArchivedTasks enqueues all archived tasks from the given queue
// and returns the number of tasks enqueued.
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
func (r *RDB) RunAllArchivedTasks(qname string) (int64, error) {
var op errors.Op = "rdb.RunAllArchivedTasks"
n, err := r.runAll(base.ArchivedKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
return n, nil
}
// runTaskCmd is a Lua script that updates the given task to pending state.
//
// Input:
// KEYS[1] -> asynq:{<qname>}:t:<task_id>
// KEYS[2] -> asynq:{<qname>}:pending
// --
// ARGV[1] -> task ID
// ARGV[2] -> queue key prefix; asynq:{<qname>}:
//
// Output:
// Numeric code indicating the status:
// Returns 1 if task is successfully updated.
// Returns 0 if task is not found.
// Returns -1 if task is in active state.
// Returns -2 if task is in pending state.
// Returns error reply if unexpected error occurs.
var runTaskCmd = redis.NewScript(`
if redis.call("EXISTS", KEYS[1]) == 0 then
return 0
end
local state = redis.call("HGET", KEYS[1], "state")
if state == "active" then
return -1
elseif state == "pending" then
return -2
end
local n = redis.call("ZREM", ARGV[2] .. state, ARGV[1])
if n == 0 then
return redis.error_reply("internal error: task id not found in zset " .. tostring(state))
end
redis.call("LPUSH", KEYS[2], ARGV[1])
redis.call("HSET", KEYS[1], "state", "pending")
return 1
`)
// RunTask finds a task that matches the id from the given queue and updates it to pending state.
// It returns nil if it successfully updated the task.
//
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
// If a task with the given id doesn't exist in the queue, it returns TaskNotFoundError
// If a task is in active or pending state it returns non-nil error with Code FailedPrecondition.
func (r *RDB) RunTask(qname string, id uuid.UUID) error {
var op errors.Op = "rdb.RunTask"
if err := r.checkQueueExists(qname); err != nil {
return errors.E(op, errors.CanonicalCode(err), err)
}
keys := []string{
base.TaskKey(qname, id.String()),
base.PendingKey(qname),
}
argv := []interface{}{
id.String(),
base.QueueKeyPrefix(qname),
}
res, err := runTaskCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return errors.E(op, errors.Unknown, err)
}
n, ok := res.(int64)
if !ok {
return errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
}
switch n {
case 1:
return nil
case 0:
return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
case -1:
return errors.E(op, errors.FailedPrecondition, "task is already running")
case -2:
return errors.E(op, errors.FailedPrecondition, "task is already in pending state")
default:
return errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from Lua script %d", n))
}
}
// runAllCmd is a Lua script that moves all tasks in the given state
// (one of: scheduled, retry, archived) to pending state.
//
// Input:
// KEYS[1] -> zset which holds task ids (e.g. asynq:{<qname>}:scheduled)
// KEYS[2] -> asynq:{<qname>}:pending
// --
// ARGV[1] -> task key prefix
//
// Output:
// integer: number of tasks updated to pending state.
var runAllCmd = redis.NewScript(`
local ids = redis.call("ZRANGE", KEYS[1], 0, -1)
for _, id in ipairs(ids) do
redis.call("LPUSH", KEYS[2], id)
redis.call("HSET", ARGV[1] .. id, "state", "pending")
end
redis.call("DEL", KEYS[1])
return table.getn(ids)`)
func (r *RDB) runAll(zset, qname string) (int64, error) {
if err := r.checkQueueExists(qname); err != nil {
return 0, err
}
keys := []string{
zset,
base.PendingKey(qname),
}
argv := []interface{}{
base.TaskKeyPrefix(qname),
}
res, err := runAllCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return 0, err
}
n, ok := res.(int64)
if !ok {
return 0, fmt.Errorf("could not cast %v to int64", res)
}
if n == -1 {
return 0, &errors.QueueNotFoundError{Queue: qname}
}
return n, nil
}
// ArchiveAllRetryTasks archives all retry tasks from the given queue and
// returns the number of tasks that were moved.
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
func (r *RDB) ArchiveAllRetryTasks(qname string) (int64, error) {
var op errors.Op = "rdb.ArchiveAllRetryTasks"
n, err := r.archiveAll(base.RetryKey(qname), base.ArchivedKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Internal, err)
}
return n, nil
}
// ArchiveAllScheduledTasks archives all scheduled tasks from the given queue and
// returns the number of tasks that were moved.
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
func (r *RDB) ArchiveAllScheduledTasks(qname string) (int64, error) {
var op errors.Op = "rdb.ArchiveAllScheduledTasks"
n, err := r.archiveAll(base.ScheduledKey(qname), base.ArchivedKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Internal, err)
}
return n, nil
}
// archiveAllPendingCmd is a Lua script that moves all pending tasks from
// the given queue to archived state.
//
// Input:
// KEYS[1] -> asynq:{<qname>}:pending
// KEYS[2] -> asynq:{<qname>}:archived
// --
// ARGV[1] -> current timestamp
// ARGV[2] -> cutoff timestamp (e.g., 90 days ago)
// ARGV[3] -> max number of tasks in archive (e.g., 100)
// ARGV[4] -> task key prefix (asynq:{<qname>}:t:)
//
// Output:
// integer: Number of tasks archived
var archiveAllPendingCmd = redis.NewScript(`
local ids = redis.call("LRANGE", KEYS[1], 0, -1)
for _, id in ipairs(ids) do
redis.call("ZADD", KEYS[2], ARGV[1], id)
redis.call("HSET", ARGV[4] .. id, "state", "archived")
end
redis.call("ZREMRANGEBYSCORE", KEYS[2], "-inf", ARGV[2])
redis.call("ZREMRANGEBYRANK", KEYS[2], 0, -ARGV[3])
redis.call("DEL", KEYS[1])
return table.getn(ids)`)
// ArchiveAllPendingTasks archives all pending tasks from the given queue and
// returns the number of tasks moved.
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
func (r *RDB) ArchiveAllPendingTasks(qname string) (int64, error) {
var op errors.Op = "rdb.ArchiveAllPendingTasks"
if err := r.checkQueueExists(qname); err != nil {
return 0, errors.E(op, errors.CanonicalCode(err), err)
}
keys := []string{
base.PendingKey(qname),
base.ArchivedKey(qname),
}
now := time.Now()
argv := []interface{}{
now.Unix(),
now.AddDate(0, 0, -archivedExpirationInDays).Unix(),
maxArchiveSize,
base.TaskKeyPrefix(qname),
}
res, err := archiveAllPendingCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return 0, errors.E(op, errors.Internal, err)
}
n, ok := res.(int64)
if !ok {
return 0, errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from script %v", res))
}
return n, nil
}
// archiveTaskCmd is a Lua script that archives a task given a task id.
//
// Input:
// KEYS[1] -> task key (asynq:{<qname>}:t:<task_id>)
// KEYS[2] -> archived key (asynq:{<qname>}:archived)
// --
// ARGV[1] -> id of the task to archive
// ARGV[2] -> current timestamp
// ARGV[3] -> cutoff timestamp (e.g., 90 days ago)
// ARGV[4] -> max number of tasks in archived state (e.g., 100)
// ARGV[5] -> queue key prefix (asynq:{<qname>}:)
//
// Output:
// Numeric code indicating the status:
// Returns 1 if task is successfully archived.
// Returns 0 if task is not found.
// Returns -1 if task is already archived.
// Returns -2 if task is in active state.
// Returns error reply if unexpected error occurs.
var archiveTaskCmd = redis.NewScript(`
if redis.call("EXISTS", KEYS[1]) == 0 then
return 0
end
local state = redis.call("HGET", KEYS[1], "state")
if state == "active" then
return -2
end
if state == "archived" then
return -1
end
if state == "pending" then
if redis.call("LREM", ARGV[5] .. state, 1, ARGV[1]) == 0 then
return redis.error_reply("task id not found in list " .. tostring(state))
end
else
if redis.call("ZREM", ARGV[5] .. state, ARGV[1]) == 0 then
return redis.error_reply("task id not found in zset " .. tostring(state))
end
end
redis.call("ZADD", KEYS[2], ARGV[2], ARGV[1])
redis.call("HSET", KEYS[1], "state", "archived")
redis.call("ZREMRANGEBYSCORE", KEYS[2], "-inf", ARGV[3])
redis.call("ZREMRANGEBYRANK", KEYS[2], 0, -ARGV[4])
return 1
`)
// ArchiveTask finds a task that matches the id from the given queue and archives it.
// It returns nil if it successfully archived the task.
//
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
// If a task with the given id doesn't exist in the queue, it returns TaskNotFoundError
// If a task is already archived, it returns TaskAlreadyArchivedError.
// If a task is in active state it returns non-nil error with FailedPrecondition code.
func (r *RDB) ArchiveTask(qname string, id uuid.UUID) error {
var op errors.Op = "rdb.ArchiveTask"
if err := r.checkQueueExists(qname); err != nil {
return errors.E(op, errors.CanonicalCode(err), err)
}
keys := []string{
base.TaskKey(qname, id.String()),
base.ArchivedKey(qname),
}
now := time.Now()
argv := []interface{}{
id.String(),
now.Unix(),
now.AddDate(0, 0, -archivedExpirationInDays).Unix(),
maxArchiveSize,
base.QueueKeyPrefix(qname),
}
res, err := archiveTaskCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return errors.E(op, errors.Unknown, err)
}
n, ok := res.(int64)
if !ok {
return errors.E(op, errors.Internal, fmt.Sprintf("could not cast the return value %v from archiveTaskCmd to int64.", res))
}
switch n {
case 1:
return nil
case 0:
return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
case -1:
return errors.E(op, errors.FailedPrecondition, &errors.TaskAlreadyArchivedError{Queue: qname, ID: id.String()})
case -2:
return errors.E(op, errors.FailedPrecondition, "cannot archive task in active state. use CancelTask instead.")
case -3:
return errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
default:
return errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from archiveTaskCmd script: %d", n))
}
}
// archiveAllCmd is a Lua script that archives all tasks in either scheduled
// or retry state from the given queue.
//
// Input:
// KEYS[1] -> ZSET to move task from (e.g., asynq:{<qname>}:retry)
// KEYS[2] -> asynq:{<qname>}:archived
// --
// ARGV[1] -> current timestamp
// ARGV[2] -> cutoff timestamp (e.g., 90 days ago)
// ARGV[3] -> max number of tasks in archive (e.g., 100)
// ARGV[4] -> task key prefix (asynq:{<qname>}:t:)
//
// Output:
// integer: number of tasks archived
var archiveAllCmd = redis.NewScript(`
local ids = redis.call("ZRANGE", KEYS[1], 0, -1)
for _, id in ipairs(ids) do
redis.call("ZADD", KEYS[2], ARGV[1], id)
redis.call("HSET", ARGV[4] .. id, "state", "archived")
end
redis.call("ZREMRANGEBYSCORE", KEYS[2], "-inf", ARGV[2])
redis.call("ZREMRANGEBYRANK", KEYS[2], 0, -ARGV[3])
redis.call("DEL", KEYS[1])
return table.getn(ids)`)
func (r *RDB) archiveAll(src, dst, qname string) (int64, error) {
if err := r.checkQueueExists(qname); err != nil {
return 0, err
}
keys := []string{
src,
dst,
}
now := time.Now()
argv := []interface{}{
now.Unix(),
now.AddDate(0, 0, -archivedExpirationInDays).Unix(),
maxArchiveSize,
base.TaskKeyPrefix(qname),
qname,
}
res, err := archiveAllCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return 0, err
}
n, ok := res.(int64)
if !ok {
return 0, fmt.Errorf("unexpected return value from script: %v", res)
}
if n == -1 {
return 0, &errors.QueueNotFoundError{Queue: qname}
}
return n, nil
}
// Input:
// KEYS[1] -> asynq:{<qname>}:t:<task_id>
// --
// ARGV[1] -> task ID
// ARGV[2] -> queue key prefix
//
// Output:
// Numeric code indicating the status:
// Returns 1 if task is successfully deleted.
// Returns 0 if task is not found.
// Returns -1 if task is in active state.
var deleteTaskCmd = redis.NewScript(`
if redis.call("EXISTS", KEYS[1]) == 0 then
return 0
end
local state = redis.call("HGET", KEYS[1], "state")
if state == "active" then
return -1
end
if state == "pending" then
if redis.call("LREM", ARGV[2] .. state, 0, ARGV[1]) == 0 then
return redis.error_reply("task is not found in list: " .. tostring(state))
end
else
if redis.call("ZREM", ARGV[2] .. state, ARGV[1]) == 0 then
return redis.error_reply("task is not found in zset: " .. tostring(state))
end
end
local unique_key = redis.call("HGET", KEYS[1], "unique_key")
if unique_key and unique_key ~= "" and redis.call("GET", unique_key) == ARGV[1] then
redis.call("DEL", unique_key)
end
return redis.call("DEL", KEYS[1])
`)
// DeleteTask finds a task that matches the id from the given queue and deletes it.
// It returns nil if it successfully archived the task.
//
// If a queue with the given name doesn't exist, it returns QueueNotFoundError.
// If a task with the given id doesn't exist in the queue, it returns TaskNotFoundError
// If a task is in active state it returns non-nil error with Code FailedPrecondition.
func (r *RDB) DeleteTask(qname string, id uuid.UUID) error {
var op errors.Op = "rdb.DeleteTask"
if err := r.checkQueueExists(qname); err != nil {
return errors.E(op, errors.CanonicalCode(err), err)
}
keys := []string{
base.TaskKey(qname, id.String()),
}
argv := []interface{}{
id.String(),
base.QueueKeyPrefix(qname),
}
res, err := deleteTaskCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return errors.E(op, errors.Unknown, err)
}
n, ok := res.(int64)
if !ok {
return errors.E(op, errors.Internal, fmt.Sprintf("cast error: deleteTaskCmd script returned unexported value %v", res))
}
switch n {
case 1:
return nil
case 0:
return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
case -1:
return errors.E(op, errors.FailedPrecondition, "cannot delete task in active state. use CancelTask instead.")
default:
return errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from deleteTaskCmd script: %d", n))
}
}
// DeleteAllArchivedTasks deletes all archived tasks from the given queue
// and returns the number of tasks deleted.
func (r *RDB) DeleteAllArchivedTasks(qname string) (int64, error) {
var op errors.Op = "rdb.DeleteAllArchivedTasks"
n, err := r.deleteAll(base.ArchivedKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
return n, nil
}
// DeleteAllRetryTasks deletes all retry tasks from the given queue
// and returns the number of tasks deleted.
func (r *RDB) DeleteAllRetryTasks(qname string) (int64, error) {
var op errors.Op = "rdb.DeleteAllRetryTasks"
n, err := r.deleteAll(base.RetryKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
return n, nil
}
// DeleteAllScheduledTasks deletes all scheduled tasks from the given queue
// and returns the number of tasks deleted.
func (r *RDB) DeleteAllScheduledTasks(qname string) (int64, error) {
var op errors.Op = "rdb.DeleteAllScheduledTasks"
n, err := r.deleteAll(base.ScheduledKey(qname), qname)
if errors.IsQueueNotFound(err) {
return 0, errors.E(op, errors.NotFound, err)
}
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
return n, nil
}
// deleteAllCmd deletes tasks from the given zset.
//
// Input:
// KEYS[1] -> zset holding the task ids.
// --
// ARGV[1] -> task key prefix
//
// Output:
// integer: number of tasks deleted
var deleteAllCmd = redis.NewScript(`
local ids = redis.call("ZRANGE", KEYS[1], 0, -1)
for _, id in ipairs(ids) do
local task_key = ARGV[1] .. id
local unique_key = redis.call("HGET", task_key, "unique_key")
if unique_key and unique_key ~= "" and redis.call("GET", unique_key) == id then
redis.call("DEL", unique_key)
end
redis.call("DEL", task_key)
end
redis.call("DEL", KEYS[1])
return table.getn(ids)`)
func (r *RDB) deleteAll(key, qname string) (int64, error) {
if err := r.checkQueueExists(qname); err != nil {
return 0, err
}
argv := []interface{}{
base.TaskKeyPrefix(qname),
qname,
}
res, err := deleteAllCmd.Run(r.client, []string{key}, argv...).Result()
if err != nil {
return 0, err
}
n, ok := res.(int64)
if !ok {
return 0, fmt.Errorf("unexpected return value from Lua script: %v", res)
}
return n, nil
}
// deleteAllPendingCmd deletes all pending tasks from the given queue.
//
// Input:
// KEYS[1] -> asynq:{<qname>}:pending
// --
// ARGV[1] -> task key prefix
//
// Output:
// integer: number of tasks deleted
var deleteAllPendingCmd = redis.NewScript(`
local ids = redis.call("LRANGE", KEYS[1], 0, -1)
for _, id in ipairs(ids) do
redis.call("DEL", ARGV[1] .. id)
end
redis.call("DEL", KEYS[1])
return table.getn(ids)`)
// DeleteAllPendingTasks deletes all pending tasks from the given queue
// and returns the number of tasks deleted.
func (r *RDB) DeleteAllPendingTasks(qname string) (int64, error) {
var op errors.Op = "rdb.DeleteAllPendingTasks"
if err := r.checkQueueExists(qname); err != nil {
return 0, errors.E(op, errors.CanonicalCode(err), err)
}
keys := []string{
base.PendingKey(qname),
}
argv := []interface{}{
base.TaskKeyPrefix(qname),
}
res, err := deleteAllPendingCmd.Run(r.client, keys, argv...).Result()
if err != nil {
return 0, errors.E(op, errors.Unknown, err)
}
n, ok := res.(int64)
if !ok {
return 0, errors.E(op, errors.Internal, "command error: unexpected return value %v", res)
}
return n, nil
}
// removeQueueForceCmd removes the given queue regardless of
// whether the queue is empty.
// It only check whether active queue is empty before removing.
//
// Input:
// KEYS[1] -> asynq:{<qname>}
// KEYS[2] -> asynq:{<qname>}:active
// KEYS[3] -> asynq:{<qname>}:scheduled
// KEYS[4] -> asynq:{<qname>}:retry
// KEYS[5] -> asynq:{<qname>}:archived
// KEYS[6] -> asynq:{<qname>}:deadlines
// --
// ARGV[1] -> task key prefix
//
// Output:
// Numeric code to indicate the status.
// Returns 1 if successfully removed.
// Returns -2 if the queue has active tasks.
var removeQueueForceCmd = redis.NewScript(`
local active = redis.call("LLEN", KEYS[2])
if active > 0 then
return -2
end
for _, id in ipairs(redis.call("LRANGE", KEYS[1], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("LRANGE", KEYS[2], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[3], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[4], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[5], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("LRANGE", KEYS[1], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("LRANGE", KEYS[2], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[3], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[4], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[5], 0, -1)) do
redis.call("DEL", ARGV[1] .. id)
end
redis.call("DEL", KEYS[1])
redis.call("DEL", KEYS[2])
redis.call("DEL", KEYS[3])
redis.call("DEL", KEYS[4])
redis.call("DEL", KEYS[5])
redis.call("DEL", KEYS[6])
return 1`)
// removeQueueCmd removes the given queue.
// It checks whether queue is empty before removing.
//
// Input:
// KEYS[1] -> asynq:{<qname>}:pending
// KEYS[2] -> asynq:{<qname>}:active
// KEYS[3] -> asynq:{<qname>}:scheduled
// KEYS[4] -> asynq:{<qname>}:retry
// KEYS[5] -> asynq:{<qname>}:archived
// KEYS[6] -> asynq:{<qname>}:deadlines
// --
// ARGV[1] -> task key prefix
//
// Output:
// Numeric code to indicate the status
// Returns 1 if successfully removed.
// Returns -1 if queue is not empty
var removeQueueCmd = redis.NewScript(`
local ids = {}
for _, id in ipairs(redis.call("LRANGE", KEYS[1], 0, -1)) do
table.insert(ids, id)
end
for _, id in ipairs(redis.call("LRANGE", KEYS[2], 0, -1)) do
table.insert(ids, id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[3], 0, -1)) do
table.insert(ids, id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[4], 0, -1)) do
table.insert(ids, id)
end
for _, id in ipairs(redis.call("ZRANGE", KEYS[5], 0, -1)) do
table.insert(ids, id)
end
if table.getn(ids) > 0 then
return -1
end
for _, id in ipairs(ids) do
redis.call("DEL", ARGV[1] .. id)
end
for _, id in ipairs(ids) do
redis.call("DEL", ARGV[1] .. id)
end
redis.call("DEL", KEYS[1])
redis.call("DEL", KEYS[2])
redis.call("DEL", KEYS[3])
redis.call("DEL", KEYS[4])
redis.call("DEL", KEYS[5])
redis.call("DEL", KEYS[6])
return 1`)
// RemoveQueue removes the specified queue.
//
// If force is set to true, it will remove the queue regardless
// as long as no tasks are active for the queue.
// If force is set to false, it will only remove the queue if
// the queue is empty.
func (r *RDB) RemoveQueue(qname string, force bool) error {
var op errors.Op = "rdb.RemoveQueue"
exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
if err != nil {
return err
}
if !exists {
return errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
}
var script *redis.Script
if force {
script = removeQueueForceCmd
} else {
script = removeQueueCmd
}
keys := []string{
base.PendingKey(qname),
base.ActiveKey(qname),
base.ScheduledKey(qname),
base.RetryKey(qname),
base.ArchivedKey(qname),
base.DeadlinesKey(qname),
}
res, err := script.Run(r.client, keys, base.TaskKeyPrefix(qname)).Result()
if err != nil {
return errors.E(op, errors.Unknown, err)
}
n, ok := res.(int64)
if !ok {
return errors.E(op, errors.Internal, fmt.Sprintf("unexpeced return value from Lua script: %v", res))
}
switch n {
case 1:
if err := r.client.SRem(base.AllQueues, qname).Err(); err != nil {
return errors.E(op, errors.Unknown, err)
}
return nil
case -1:
return errors.E(op, errors.NotFound, &errors.QueueNotEmptyError{Queue: qname})
case -2:
return errors.E(op, errors.FailedPrecondition, "cannot remove queue with active tasks")
default:
return errors.E(op, errors.Unknown, fmt.Sprintf("unexpected return value from Lua script: %d", n))
}
}
// Note: Script also removes stale keys.
var listServerKeysCmd = redis.NewScript(`
local now = tonumber(ARGV[1])
local keys = redis.call("ZRANGEBYSCORE", KEYS[1], now, "+inf")
redis.call("ZREMRANGEBYSCORE", KEYS[1], "-inf", now-1)
return keys`)
// ListServers returns the list of server info.
func (r *RDB) ListServers() ([]*base.ServerInfo, error) {
now := time.Now()
res, err := listServerKeysCmd.Run(r.client, []string{base.AllServers}, now.Unix()).Result()
if err != nil {
return nil, err
}
keys, err := cast.ToStringSliceE(res)
if err != nil {
return nil, err
}
var servers []*base.ServerInfo
for _, key := range keys {
data, err := r.client.Get(key).Result()
if err != nil {
continue // skip bad data
}
info, err := base.DecodeServerInfo([]byte(data))
if err != nil {
continue // skip bad data
}
servers = append(servers, info)
}
return servers, nil
}
// Note: Script also removes stale keys.
var listWorkersCmd = redis.NewScript(`
local now = tonumber(ARGV[1])
local keys = redis.call("ZRANGEBYSCORE", KEYS[1], now, "+inf")
redis.call("ZREMRANGEBYSCORE", KEYS[1], "-inf", now-1)
return keys`)
// ListWorkers returns the list of worker stats.
func (r *RDB) ListWorkers() ([]*base.WorkerInfo, error) {
var op errors.Op = "rdb.ListWorkers"
now := time.Now()
res, err := listWorkersCmd.Run(r.client, []string{base.AllWorkers}, now.Unix()).Result()
if err != nil {
return nil, errors.E(op, errors.Unknown, err)
}
keys, err := cast.ToStringSliceE(res)
if err != nil {
return nil, errors.E(op, errors.Internal, fmt.Sprintf("unexpeced return value from Lua script: %v", res))
}
var workers []*base.WorkerInfo
for _, key := range keys {
data, err := r.client.HVals(key).Result()
if err != nil {
continue // skip bad data
}
for _, s := range data {
w, err := base.DecodeWorkerInfo([]byte(s))
if err != nil {
continue // skip bad data
}
workers = append(workers, w)
}
}
return workers, nil
}
// Note: Script also removes stale keys.
var listSchedulerKeysCmd = redis.NewScript(`
local now = tonumber(ARGV[1])
local keys = redis.call("ZRANGEBYSCORE", KEYS[1], now, "+inf")
redis.call("ZREMRANGEBYSCORE", KEYS[1], "-inf", now-1)
return keys`)
// ListSchedulerEntries returns the list of scheduler entries.
func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
now := time.Now()
res, err := listSchedulerKeysCmd.Run(r.client, []string{base.AllSchedulers}, now.Unix()).Result()
if err != nil {
return nil, err
}
keys, err := cast.ToStringSliceE(res)
if err != nil {
return nil, err
}
var entries []*base.SchedulerEntry
for _, key := range keys {
data, err := r.client.LRange(key, 0, -1).Result()
if err != nil {
continue // skip bad data
}
for _, s := range data {
e, err := base.DecodeSchedulerEntry([]byte(s))
if err != nil {
continue // skip bad data
}
entries = append(entries, e)
}
}
return entries, nil
}
// ListSchedulerEnqueueEvents returns the list of scheduler enqueue events.
func (r *RDB) ListSchedulerEnqueueEvents(entryID string, pgn Pagination) ([]*base.SchedulerEnqueueEvent, error) {
key := base.SchedulerHistoryKey(entryID)
zs, err := r.client.ZRevRangeWithScores(key, pgn.start(), pgn.stop()).Result()
if err != nil {
return nil, err
}
var events []*base.SchedulerEnqueueEvent
for _, z := range zs {
data, err := cast.ToStringE(z.Member)
if err != nil {
return nil, err
}
e, err := base.DecodeSchedulerEnqueueEvent([]byte(data))
if err != nil {
return nil, err
}
events = append(events, e)
}
return events, nil
}
// Pause pauses processing of tasks from the given queue.
func (r *RDB) Pause(qname string) error {
key := base.PausedKey(qname)
ok, err := r.client.SetNX(key, time.Now().Unix(), 0).Result()
if err != nil {
return err
}
if !ok {
return fmt.Errorf("queue %q is already paused", qname)
}
return nil
}
// Unpause resumes processing of tasks from the given queue.
func (r *RDB) Unpause(qname string) error {
key := base.PausedKey(qname)
deleted, err := r.client.Del(key).Result()
if err != nil {
return err
}
if deleted == 0 {
return fmt.Errorf("queue %q is not paused", qname)
}
return nil
}
// ClusterKeySlot returns an integer identifying the hash slot the given queue hashes to.
func (r *RDB) ClusterKeySlot(qname string) (int64, error) {
key := base.PendingKey(qname)
return r.client.ClusterKeySlot(key).Result()
}
// ClusterNodes returns a list of nodes the given queue belongs to.
func (r *RDB) ClusterNodes(qname string) ([]redis.ClusterNode, error) {
keyslot, err := r.ClusterKeySlot(qname)
if err != nil {
return nil, err
}
clusterSlots, err := r.client.ClusterSlots().Result()
if err != nil {
return nil, err
}
for _, slotRange := range clusterSlots {
if int64(slotRange.Start) <= keyslot && keyslot <= int64(slotRange.End) {
return slotRange.Nodes, nil
}
}
return nil, fmt.Errorf("nodes not found")
}
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