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issue.go
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package main | |
import ( | |
"fmt" | |
"github.com/practo/klog/v2" | |
"os" | |
"os/signal" | |
"sync" | |
"syscall" | |
"time" | |
) | |
type none struct{} | |
type partitionConsumer struct { | |
topic string | |
} | |
type brokerConsumer struct { | |
id string | |
input chan *partitionConsumer | |
newSubscriptions chan []*partitionConsumer | |
subscriptions map[*partitionConsumer]none | |
wait chan none | |
acks sync.WaitGroup | |
} | |
func main() { | |
bc := &brokerConsumer{ | |
id: "2", | |
input: make(chan *partitionConsumer), | |
newSubscriptions: make(chan []*partitionConsumer), | |
wait: make(chan none), | |
subscriptions: make(map[*partitionConsumer]none), | |
} | |
go bc.producer() | |
go bc.subscriptionManager() | |
go bc.subscriptionConsumer() | |
sigterm := make(chan os.Signal, 1) | |
signal.Notify(sigterm, syscall.SIGINT, syscall.SIGTERM) | |
for { | |
select { | |
default: | |
case <-sigterm: | |
klog.Info("SIGTERM signal received") | |
os.Exit(1) | |
} | |
} | |
} | |
func (bc *brokerConsumer) producer() { | |
for i := 0; i < 10; i++ { | |
pc := &partitionConsumer{topic: fmt.Sprintf("ts.topic-%d", i)} | |
bc.input <- pc | |
// klog.Infof("produced ts.topic-%d", i) | |
time.Sleep(1 * time.Second) | |
} | |
klog.Info("producing done") | |
} | |
func (bc *brokerConsumer) subscriptionManager() { | |
var buffer []*partitionConsumer | |
klog.Infof("subscriptionManager(%v) STARTING FOR LOOP", bc.id) | |
// flushTicker := time.NewTicker(5 * time.Second) | |
for { | |
if len(buffer) > 0 { | |
// klog.Infof("subscriptionManager(%v) rerun loop, buffer=%v", bc.id, len(buffer)) | |
select { | |
case event, ok := <-bc.input: | |
if !ok { | |
klog.Infof("subscriptionManager(%v) empty receive (bc.input closed)", bc.id) | |
goto done | |
} | |
buffer = append(buffer, event) | |
klog.Infof("subscriptionManager(%v) received %s, buffer(%v)", bc.id, event.topic, len(buffer)) | |
case bc.newSubscriptions <- buffer: | |
klog.Infof("subscriptionManager(%v) flushed buffer(%v), buffer set nil", bc.id, len(buffer)) | |
// case <-flushTicker.C: | |
// select { | |
// default: | |
// case bc.newSubscriptions <- buffer: | |
// klog.Infof("subscriptionManager(%v) flushed buffer(%v), buffer set nil", bc.id, len(buffer)) | |
// buffer = nil | |
// } | |
case bc.wait <- none{}: | |
klog.Infof("subscriptionManager(%v) bc.wait() stopped", bc.id) | |
} | |
} else { | |
select { | |
case event, ok := <-bc.input: | |
if !ok { | |
klog.Infof("subscriptionManager(%v) buffer=0, empty receive (bc.input closed)", bc.id) | |
goto done | |
} | |
buffer = append(buffer, event) | |
klog.Infof("subscriptionManager(%v) received %s, buffer(%v)", bc.id, event.topic, len(buffer)) | |
case bc.newSubscriptions <- nil: | |
klog.Infof("subscriptionManager(%v) bc.newSubscriptions <- nil", bc.id) | |
} | |
} | |
} | |
done: | |
klog.Infof("subscriptionManager(%v) close(bc.wait)", bc.id) | |
close(bc.wait) | |
if len(buffer) > 0 { | |
klog.Infof("subscriptionManager(%v) buffer > 0, sent buffer(%v)=%v", len(buffer), buffer) | |
bc.newSubscriptions <- buffer | |
} | |
klog.Infof("subscriptionManager(%v) close(bc.newSubscriptions)", bc.id) | |
close(bc.newSubscriptions) | |
} | |
func (bc *brokerConsumer) subscriptionConsumer() { | |
klog.Infof("subscriptionConsumer(%v) waiting", bc.id) | |
<-bc.wait // wait for our first piece of work | |
klog.Infof("subscriptionConsumer(%v) resuming...", bc.id) | |
for newSubscriptions := range bc.newSubscriptions { | |
// klog.Infof("subscriptionConsumer(%v) updating newSubscription=%+v", bc.id, newSubscriptions) | |
bc.updateSubscriptions(newSubscriptions) | |
if len(bc.subscriptions) == 0 { | |
// We're about to be shut down or we're about to receive more subscriptions. | |
// Either way, the signal just hasn't propagated to our goroutine yet. | |
klog.Infof("subscriptionConsumer(%v) bc.subscriptions==0 waiting", bc.id) | |
<-bc.wait | |
continue | |
} | |
klog.Infof("subscriptionConsumer(%v) waiting for acks wait()", bc.id) | |
time.Sleep(1000 * time.Second) | |
} | |
} | |
func (bc *brokerConsumer) updateSubscriptions(newSubscriptions []*partitionConsumer) { | |
for _, child := range newSubscriptions { | |
// klog.Infof("updateSubscriptions(%s)", child.topic) | |
bc.subscriptions[child] = none{} | |
klog.Infof("added subscription to %v/%v\n", bc.id, child.topic) | |
} | |
} |
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