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Create PeriodicTaskManager
This commit is contained in:
Ken Hibino
parent
25832e5e95
commit
053fe2d1ee
243
periodic_task_manager.go
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243
periodic_task_manager.go
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@ -0,0 +1,243 @@
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// Copyright 2022 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 asynq
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import (
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"crypto/sha256"
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"fmt"
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"io"
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"sort"
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"sync"
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"time"
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)
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// PeriodicTaskManager manages scheduling of periodic tasks.
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// It syncs scheduler's entries by calling the config provider periodically.
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type PeriodicTaskManager struct {
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s *Scheduler
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p PeriodicTaskConfigProvider
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syncInterval time.Duration
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done chan (struct{})
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wg sync.WaitGroup
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m map[string]string // map[hash]entryID
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}
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type PeriodicTaskManagerOpts struct {
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// Required: must be non nil
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PeriodicTaskConfigProvider PeriodicTaskConfigProvider
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// Required: must be non nil
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RedisConnOpt RedisConnOpt
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// Optional: scheduler options
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*SchedulerOpts
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// Optional: default is 3m
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SyncInterval time.Duration
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}
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const defaultSyncInterval = 3 * time.Minute
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// NewPeriodicTaskManager returns a new PeriodicTaskManager instance.
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// The given opts should specify the RedisConnOp and PeriodicTaskConfigProvider at minimum.
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func NewPeriodicTaskManager(opts PeriodicTaskManagerOpts) (*PeriodicTaskManager, error) {
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if opts.PeriodicTaskConfigProvider == nil {
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return nil, fmt.Errorf("PeriodicTaskConfigProvider cannot be nil")
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}
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if opts.RedisConnOpt == nil {
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return nil, fmt.Errorf("RedisConnOpt cannot be nil")
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}
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scheduler := NewScheduler(opts.RedisConnOpt, opts.SchedulerOpts)
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syncInterval := opts.SyncInterval
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if syncInterval == 0 {
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syncInterval = defaultSyncInterval
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}
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return &PeriodicTaskManager{
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s: scheduler,
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p: opts.PeriodicTaskConfigProvider,
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syncInterval: syncInterval,
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done: make(chan struct{}),
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m: make(map[string]string),
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}, nil
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}
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// PeriodicTaskConfigProvider provides configs for periodic tasks.
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// GetConfigs will be called by a PeriodicTaskManager periodically to
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// sync the scheduler's entries with the configs returned by the provider.
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type PeriodicTaskConfigProvider interface {
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GetConfigs() ([]*PeriodicTaskConfig, error)
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}
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// PeriodicTaskConfig specifies the details of a periodic task.
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type PeriodicTaskConfig struct {
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Cronspec string // required: must be non empty string
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Task *Task // required: must be non nil
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Opts []Option // optional: can be nil
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}
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func (c *PeriodicTaskConfig) hash() string {
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h := sha256.New()
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io.WriteString(h, c.Cronspec)
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io.WriteString(h, c.Task.Type())
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h.Write(c.Task.Payload())
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opts := stringifyOptions(c.Opts)
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sort.Strings(opts)
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for _, opt := range opts {
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io.WriteString(h, opt)
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}
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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func validatePeriodicTaskConfig(c *PeriodicTaskConfig) error {
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if c == nil {
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return fmt.Errorf("PeriodicTaskConfig cannot be nil")
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}
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if c.Task == nil {
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return fmt.Errorf("PeriodicTaskConfig.Task cannot be nil")
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}
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if c.Cronspec == "" {
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return fmt.Errorf("PeriodicTaskConfig.Cronspec cannot be empty")
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}
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return nil
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}
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// Start starts a scheduler and background goroutine to sync the scheduler with the configs
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// returned by the provider.
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//
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// Start returns any error encountered at start up time.
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func (mgr *PeriodicTaskManager) Start() error {
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if mgr.s == nil || mgr.p == nil {
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panic("asynq: cannot start uninitialized PeriodicTaskManager; use NewPeriodicTaskManager to initialize")
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}
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if err := mgr.initialSync(); err != nil {
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return fmt.Errorf("asynq: %v", err)
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}
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if err := mgr.s.Start(); err != nil {
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return fmt.Errorf("asynq: %v", err)
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}
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mgr.wg.Add(1)
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go func() {
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defer mgr.wg.Done()
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ticker := time.NewTicker(mgr.syncInterval)
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for {
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select {
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case <-mgr.done:
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mgr.s.logger.Debugf("Stopping syncer goroutine")
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ticker.Stop()
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return
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case <-ticker.C:
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mgr.sync()
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}
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}
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}()
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return nil
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}
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// Shutdown gracefully shuts down the manager.
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// It notifies a background syncer goroutine to stop and stops scheduler.
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func (mgr *PeriodicTaskManager) Shutdown() {
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close(mgr.done)
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mgr.wg.Wait()
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mgr.s.Shutdown()
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}
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// Run starts the manager and blocks until an os signal to exit the program is received.
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// Once it receives a signal, it gracefully shuts down the manager.
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func (mgr *PeriodicTaskManager) Run() error {
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if err := mgr.Start(); err != nil {
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return err
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}
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mgr.s.waitForSignals()
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mgr.Shutdown()
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mgr.s.logger.Debugf("PeriodicTaskManager exiting")
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return nil
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}
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func (mgr *PeriodicTaskManager) initialSync() error {
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configs, err := mgr.p.GetConfigs()
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if err != nil {
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return fmt.Errorf("initial call to GetConfigs failed: %v", err)
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}
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for _, c := range configs {
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if err := validatePeriodicTaskConfig(c); err != nil {
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return fmt.Errorf("initial call to GetConfigs contained an invalid config: %v", err)
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}
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}
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mgr.add(configs)
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return nil
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}
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func (mgr *PeriodicTaskManager) add(configs []*PeriodicTaskConfig) {
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for _, c := range configs {
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entryID, err := mgr.s.Register(c.Cronspec, c.Task, c.Opts...)
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if err != nil {
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mgr.s.logger.Errorf("Failed to register periodic task: cronspec=%q task=%q",
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c.Cronspec, c.Task.Type())
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continue
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}
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mgr.m[c.hash()] = entryID
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mgr.s.logger.Infof("Successfully registered periodic task: cronspec=%q task=%q, entryID=%s",
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c.Cronspec, c.Task.Type(), entryID)
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}
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}
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func (mgr *PeriodicTaskManager) remove(removed map[string]string) {
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for hash, entryID := range removed {
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if err := mgr.s.Unregister(entryID); err != nil {
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mgr.s.logger.Errorf("Failed to unregister periodic task: %v", err)
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continue
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}
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delete(mgr.m, hash)
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mgr.s.logger.Infof("Successfully unregistered periodic task: entryID=%s", entryID)
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}
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}
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func (mgr *PeriodicTaskManager) sync() {
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configs, err := mgr.p.GetConfigs()
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if err != nil {
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mgr.s.logger.Errorf("Failed to get periodic task configs: %v", err)
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return
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}
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for _, c := range configs {
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if err := validatePeriodicTaskConfig(c); err != nil {
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mgr.s.logger.Errorf("Failed to sync: GetConfigs returned an invalid config: %v", err)
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return
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}
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}
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// Diff and only register/unregister the newly added/removed entries.
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removed := mgr.diffRemoved(configs)
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added := mgr.diffAdded(configs)
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mgr.remove(removed)
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mgr.add(added)
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}
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// diffRemoved diffs the incoming configs with the registered config and returns
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// a map containing hash and entryID of each config that was removed.
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func (mgr *PeriodicTaskManager) diffRemoved(configs []*PeriodicTaskConfig) map[string]string {
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newConfigs := make(map[string]string)
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for _, c := range configs {
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newConfigs[c.hash()] = "" // empty value since we don't have entryID yet
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}
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removed := make(map[string]string)
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for k, v := range mgr.m {
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// test whether existing config is present in the incoming configs
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if _, found := newConfigs[k]; !found {
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removed[k] = v
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}
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}
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return removed
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}
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// diffAdded diffs the incoming configs with the registered configs and returns
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// a list of configs that were added.
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func (mgr *PeriodicTaskManager) diffAdded(configs []*PeriodicTaskConfig) []*PeriodicTaskConfig {
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var added []*PeriodicTaskConfig
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for _, c := range configs {
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if _, found := mgr.m[c.hash()]; !found {
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added = append(added, c)
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}
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}
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return added
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}
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343
periodic_task_manager_test.go
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343
periodic_task_manager_test.go
Normal file
@ -0,0 +1,343 @@
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// Copyright 2022 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 asynq
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import (
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"sort"
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"sync"
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"testing"
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"time"
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"github.com/google/go-cmp/cmp"
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)
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// Trivial implementation of PeriodicTaskConfigProvider for testing purpose.
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type FakeConfigProvider struct {
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mu sync.Mutex
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cfgs []*PeriodicTaskConfig
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}
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func (p *FakeConfigProvider) SetConfigs(cfgs []*PeriodicTaskConfig) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.cfgs = cfgs
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}
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func (p *FakeConfigProvider) GetConfigs() ([]*PeriodicTaskConfig, error) {
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p.mu.Lock()
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defer p.mu.Unlock()
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return p.cfgs, nil
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}
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func TestNewPeriodicTaskManager(t *testing.T) {
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cfgs := []*PeriodicTaskConfig{
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{Cronspec: "* * * * *", Task: NewTask("foo", nil)},
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{Cronspec: "* * * * *", Task: NewTask("bar", nil)},
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}
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tests := []struct {
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desc string
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opts PeriodicTaskManagerOpts
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}{
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{
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desc: "with provider and redisConnOpt",
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opts: PeriodicTaskManagerOpts{
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RedisConnOpt: RedisClientOpt{Addr: ":6379"},
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PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
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},
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},
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{
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desc: "with sync option",
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opts: PeriodicTaskManagerOpts{
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RedisConnOpt: RedisClientOpt{Addr: ":6379"},
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PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
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SyncInterval: 5 * time.Minute,
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},
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},
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{
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desc: "with scheduler option",
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opts: PeriodicTaskManagerOpts{
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RedisConnOpt: RedisClientOpt{Addr: ":6379"},
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PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
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SyncInterval: 5 * time.Minute,
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SchedulerOpts: &SchedulerOpts{
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LogLevel: DebugLevel,
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},
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},
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},
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}
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for _, tc := range tests {
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_, err := NewPeriodicTaskManager(tc.opts)
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if err != nil {
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t.Errorf("%s; NewPeriodicTaskManager returned error: %v", tc.desc, err)
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}
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}
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}
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func TestNewPeriodicTaskManagerError(t *testing.T) {
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cfgs := []*PeriodicTaskConfig{
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{Cronspec: "* * * * *", Task: NewTask("foo", nil)},
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{Cronspec: "* * * * *", Task: NewTask("bar", nil)},
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}
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tests := []struct {
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desc string
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opts PeriodicTaskManagerOpts
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}{
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{
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desc: "without provider",
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opts: PeriodicTaskManagerOpts{
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RedisConnOpt: RedisClientOpt{Addr: ":6379"},
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},
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},
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{
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desc: "without redisConOpt",
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opts: PeriodicTaskManagerOpts{
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PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
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},
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},
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}
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for _, tc := range tests {
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_, err := NewPeriodicTaskManager(tc.opts)
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if err == nil {
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t.Errorf("%s; NewPeriodicTaskManager did not return error", tc.desc)
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}
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}
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}
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func TestPeriodicTaskConfigHash(t *testing.T) {
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tests := []struct {
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desc string
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a *PeriodicTaskConfig
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b *PeriodicTaskConfig
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isSame bool
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}{
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{
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desc: "basic identity test",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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},
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isSame: true,
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},
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{
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desc: "with a option",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Queue("myqueue")},
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Queue("myqueue")},
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},
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isSame: true,
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},
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{
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desc: "with multiple options (different order)",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Unique(5 * time.Minute), Queue("myqueue")},
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Queue("myqueue"), Unique(5 * time.Minute)},
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},
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isSame: true,
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},
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{
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desc: "with payload",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", []byte("hello world!")),
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Opts: []Option{Queue("myqueue")},
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", []byte("hello world!")),
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Opts: []Option{Queue("myqueue")},
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},
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isSame: true,
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},
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{
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desc: "with different cronspecs",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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},
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b: &PeriodicTaskConfig{
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Cronspec: "5 * * * *",
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Task: NewTask("foo", nil),
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},
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isSame: false,
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},
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{
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desc: "with different task type",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("bar", nil),
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},
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isSame: false,
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},
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{
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desc: "with different options",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Queue("myqueue")},
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Unique(10 * time.Minute)},
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},
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isSame: false,
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},
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{
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desc: "with different options (one is subset of the other)",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Queue("myqueue")},
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", nil),
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Opts: []Option{Queue("myqueue"), Unique(10 * time.Minute)},
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},
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isSame: false,
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},
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{
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desc: "with different payload",
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a: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", []byte("hello!")),
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Opts: []Option{Queue("myqueue")},
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},
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b: &PeriodicTaskConfig{
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Cronspec: "* * * * *",
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Task: NewTask("foo", []byte("HELLO!")),
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Opts: []Option{Queue("myqueue"), Unique(10 * time.Minute)},
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},
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isSame: false,
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},
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}
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for _, tc := range tests {
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if tc.isSame && tc.a.hash() != tc.b.hash() {
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t.Errorf("%s: a.hash=%s b.hash=%s expected to be equal",
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tc.desc, tc.a.hash(), tc.b.hash())
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}
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if !tc.isSame && tc.a.hash() == tc.b.hash() {
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t.Errorf("%s: a.hash=%s b.hash=%s expected to be not equal",
|
||||
tc.desc, tc.a.hash(), tc.b.hash())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Things to test.
|
||||
// - Run the manager
|
||||
// - Change provider to return new configs
|
||||
// - Verify that the scheduler synced with the new config
|
||||
func TestPeriodicTaskManager(t *testing.T) {
|
||||
// Note: In this test, we'll use task type as an ID for each config.
|
||||
cfgs := []*PeriodicTaskConfig{
|
||||
{Task: NewTask("task1", nil), Cronspec: "* * * * 1"},
|
||||
{Task: NewTask("task2", nil), Cronspec: "* * * * 2"},
|
||||
}
|
||||
const syncInterval = 3 * time.Second
|
||||
provider := &FakeConfigProvider{cfgs: cfgs}
|
||||
mgr, err := NewPeriodicTaskManager(PeriodicTaskManagerOpts{
|
||||
RedisConnOpt: getRedisConnOpt(t),
|
||||
PeriodicTaskConfigProvider: provider,
|
||||
SyncInterval: syncInterval,
|
||||
})
|
||||
if err != nil {
|
||||
t.Fatalf("Failed to initialize PeriodicTaskManager: %v", err)
|
||||
}
|
||||
|
||||
if err := mgr.Start(); err != nil {
|
||||
t.Fatalf("Failed to start PeriodicTaskManager: %v", err)
|
||||
}
|
||||
defer mgr.Shutdown()
|
||||
|
||||
got := extractCronEntries(mgr.s)
|
||||
want := []*cronEntry{
|
||||
{Cronspec: "* * * * 1", TaskType: "task1"},
|
||||
{Cronspec: "* * * * 2", TaskType: "task2"},
|
||||
}
|
||||
if diff := cmp.Diff(want, got, sortCronEntry); diff != "" {
|
||||
t.Errorf("Diff found in scheduler's registered entries: %s", diff)
|
||||
}
|
||||
|
||||
// Change the underlying configs
|
||||
// - task2 removed
|
||||
// - task3 added
|
||||
provider.SetConfigs([]*PeriodicTaskConfig{
|
||||
{Task: NewTask("task1", nil), Cronspec: "* * * * 1"},
|
||||
{Task: NewTask("task3", nil), Cronspec: "* * * * 3"},
|
||||
})
|
||||
|
||||
// Wait for the next sync
|
||||
time.Sleep(syncInterval * 2)
|
||||
|
||||
// Verify the entries are synced
|
||||
got = extractCronEntries(mgr.s)
|
||||
want = []*cronEntry{
|
||||
{Cronspec: "* * * * 1", TaskType: "task1"},
|
||||
{Cronspec: "* * * * 3", TaskType: "task3"},
|
||||
}
|
||||
if diff := cmp.Diff(want, got, sortCronEntry); diff != "" {
|
||||
t.Errorf("Diff found in scheduler's registered entries: %s", diff)
|
||||
}
|
||||
|
||||
// Change the underlying configs
|
||||
// All configs removed, empty set.
|
||||
provider.SetConfigs([]*PeriodicTaskConfig{})
|
||||
|
||||
// Wait for the next sync
|
||||
time.Sleep(syncInterval * 2)
|
||||
|
||||
// Verify the entries are synced
|
||||
got = extractCronEntries(mgr.s)
|
||||
want = []*cronEntry{}
|
||||
if diff := cmp.Diff(want, got, sortCronEntry); diff != "" {
|
||||
t.Errorf("Diff found in scheduler's registered entries: %s", diff)
|
||||
}
|
||||
}
|
||||
|
||||
func extractCronEntries(s *Scheduler) []*cronEntry {
|
||||
var out []*cronEntry
|
||||
for _, e := range s.cron.Entries() {
|
||||
job := e.Job.(*enqueueJob)
|
||||
out = append(out, &cronEntry{Cronspec: job.cronspec, TaskType: job.task.Type()})
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
var sortCronEntry = cmp.Transformer("sortCronEntry", func(in []*cronEntry) []*cronEntry {
|
||||
out := append([]*cronEntry(nil), in...)
|
||||
sort.Slice(out, func(i, j int) bool {
|
||||
return out[i].TaskType < out[j].TaskType
|
||||
})
|
||||
return out
|
||||
})
|
||||
|
||||
// A simple struct to allow for simpler comparison in test.
|
||||
type cronEntry struct {
|
||||
Cronspec string
|
||||
TaskType string
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user