132 lines
2.4 KiB
Go
132 lines
2.4 KiB
Go
package satan
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import (
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"log"
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"sync"
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"time"
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"github.com/localhots/satan/backend"
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"github.com/localhots/satan/backend/kafka"
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)
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// Satan is the master daemon.
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type Satan struct {
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daemons []Daemon
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backend backend.Backend
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queue chan *task
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wg sync.WaitGroup
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latency *statistics
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shutdown chan struct{}
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}
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// Actor is a function that could be executed by daemon workers.
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type Actor func()
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type task struct {
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daemon Daemon
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actor Actor
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createdAt time.Time
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system bool
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}
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const (
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defaultNumWorkers = 10
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)
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// Summon creates a new instance of Satan.
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func Summon() *Satan {
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return &Satan{
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queue: make(chan *task),
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latency: newStatistics(),
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shutdown: make(chan struct{}),
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}
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}
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// AddDaemon adds a new daemon.
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func (s *Satan) AddDaemon(d Daemon) {
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d.initialize(d, s.queue)
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if c, ok := d.(Consumer); ok {
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c.setBackend(s.backend)
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}
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go d.Startup()
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s.daemons = append(s.daemons, d)
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}
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// StartDaemons starts all registered daemons.
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func (s *Satan) StartDaemons() {
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s.wg.Add(defaultNumWorkers)
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for i := 0; i < defaultNumWorkers; i++ {
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go func(i int) {
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s.runWorker(i)
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s.wg.Done()
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}(i)
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}
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}
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// StopDaemons stops all running daemons.
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func (s *Satan) StopDaemons() {
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for _, d := range s.daemons {
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close(d.base().shutdown)
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d.Shutdown()
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log.Printf("%s daemon performace statistics:\n%s\n",
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d.base(), d.base().stats.snapshot())
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}
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close(s.shutdown)
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s.wg.Wait()
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close(s.queue)
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s.backend.Close()
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log.Printf("Task processing latency statistics:\n%s\n", s.latency.snapshot())
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}
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func (s *Satan) runWorker(i int) {
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log.Printf("Starting worker #%d", i+1)
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defer log.Printf("Worker #%d has stopped", i+1)
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for {
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select {
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case t := <-s.queue:
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dur := time.Now().UnixNano() - t.createdAt.UnixNano()
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s.latency.add(time.Duration(dur))
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// log.Printf("Daemon #%d got some job to do!", i+1)
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s.processTask(t)
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default:
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select {
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case <-s.shutdown:
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return
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default:
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}
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}
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}
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}
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func (s *Satan) processTask(t *task) {
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defer t.daemon.base().handlePanic()
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start := time.Now()
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t.actor()
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dur := time.Now().UnixNano() - start.UnixNano()
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t.daemon.base().stats.add(time.Duration(dur))
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}
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// InitializeKafka initializes Kafka backend.
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func (s *Satan) InitializeKafka(id string, brokers []string) error {
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k, err := kafka.New(id, brokers)
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if err != nil {
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return err
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}
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if err = k.InitializeProducer(); err != nil {
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return err
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}
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if err = k.InitializeConsumer(); err != nil {
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return err
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}
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s.backend = k
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return nil
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}
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