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queue.go
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queue.go
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package nsq
import (
"bytes"
"encoding/gob"
"errors"
"fmt"
"log"
"math"
"net"
"os"
"time"
"github.com/ScoreTrak/ScoreTrak/pkg/queue/queueing"
"github.com/ScoreTrak/ScoreTrak/pkg/servicegroup"
"github.com/gofrs/uuid"
"github.com/nsqio/go-nsq"
)
type WorkerQueue struct {
config queueing.Config
}
var ErrWorkersFailed = errors.New("some workers failed to receive the checks. Make sure that is by design")
// Send sends scoring data to the NSQD nodes, and returns either a list of checks with a warning, or an error
func (n WorkerQueue) Send(sds []*queueing.ScoringData) ([]*queueing.QCheck, error, error) {
returningTopicName, err := queueing.TopicFromServiceRound(sds[0].RoundID)
if err != nil {
return nil, nil, err
}
producerConfig := nsq.NewConfig()
nsqProducerConfig(producerConfig, n.config)
producer, err := nsq.NewProducer(n.config.NSQ.ProducerNSQD, producerConfig)
if err != nil {
return nil, nil, err
}
defer producer.Stop()
m := make(map[string][][]byte)
for _, sd := range sds {
sd.Service.ReturningTopic = returningTopicName
buf := &bytes.Buffer{}
if err := gob.NewEncoder(buf).Encode(sd); err != nil {
return nil, nil, err
}
m[sd.Service.Group] = append(m[sd.Service.Group], buf.Bytes())
}
for k, v := range m {
err = producer.MultiPublish(k, v)
if err != nil {
return nil, nil, err
}
}
consumerConfig := nsq.NewConfig()
nsqConsumerConfig(consumerConfig, n.config)
consumer, err := nsq.NewConsumer(returningTopicName, "worker", consumerConfig)
if err != nil {
return nil, nil, err
}
defer consumer.Stop()
ret := make([]*queueing.QCheck, len(sds))
consumer.ChangeMaxInFlight(len(sds))
cq := make(chan queueing.IndexedQueue, 1)
consumer.SetLoggerLevel(nsq.LogLevelError)
idIndexMap := make(map[uuid.UUID]int)
for i, sd := range sds {
idIndexMap[sd.Service.ID] = i
}
consumer.AddHandler(nsq.HandlerFunc(func(m *nsq.Message) error {
buf := bytes.NewBuffer(m.Body)
var qc queueing.QCheck
if err := gob.NewDecoder(buf).Decode(&qc); err != nil {
return err
}
if i, ok := idIndexMap[qc.Service.ID]; ok {
cq <- queueing.IndexedQueue{Q: &qc, I: i}
return nil
}
return nil
}))
err = connectConsumer(consumer, n.config)
if err != nil {
return nil, nil, err
}
counter := len(sds)
for {
select {
case res := <-cq:
ret[res.I] = res.Q
counter--
if counter == 0 {
return ret, nil, nil
}
case <-time.After(time.Until(sds[0].Deadline)):
if !n.config.NSQ.IgnoreAllScoresIfWorkerFails {
return nil, nil, &queueing.RoundTookTooLongToExecute{Msg: "Round took too long to score. This might be due to many reasons like a worker going down, or the number of rounds being too big for workers to handle"}
}
return ret, ErrWorkersFailed, nil
}
}
}
var ErrUnknownPanic = errors.New("unknown panic")
var ErrPanic = errors.New("panic")
func (n WorkerQueue) Receive() {
conf := nsq.NewConfig()
nsqConsumerConfig(conf, n.config)
consumer, err := nsq.NewConsumer(n.config.NSQ.Topic, "worker", conf)
if err != nil {
log.Panicf("Failed to initialize NSQ consumer. Error: %v", err)
}
consumer.SetLoggerLevel(nsq.LogLevelError)
consumer.AddConcurrentHandlers(nsq.HandlerFunc(func(m *nsq.Message) error {
buf := bytes.NewBuffer(m.Body)
var sd queueing.ScoringData
defer func() {
if x := recover(); x != nil {
var err error
switch x := x.(type) {
case string:
err = fmt.Errorf("%w: %s", ErrPanic, x)
case error:
err = x
default:
err = ErrUnknownPanic
}
qc := queueing.QCheck{Service: sd.Service, Passed: false, Log: "Encountered an unexpected error during the check.", Err: err.Error(), RoundID: sd.RoundID}
n.Acknowledge(qc)
return
}
}()
if err := gob.NewDecoder(buf).Decode(&sd); err != nil {
panic(err)
}
dsync := -time.Since(sd.MasterTime)
if float64(time.Second*5) < math.Abs(float64(dsync)) {
name, _ := os.Hostname()
n.Acknowledge(queueing.QCheck{Service: sd.Service, Passed: false, Log: "Please provide the error to Black Team / Competition Administrator", Err: fmt.Sprintf("Worker with IP: %s, Hostname: %s is either out of sync, or worker received the message late", getOutboundIP(), name), RoundID: sd.RoundID})
return nil
}
qc := queueing.CommonExecute(&sd, sd.Deadline.Add(-3*time.Second+dsync))
n.Acknowledge(qc)
return nil
}), n.config.NSQ.ConcurrentHandlers)
err = connectConsumer(consumer, n.config)
if err != nil {
panic(err)
}
select {}
}
//https://stackoverflow.com/a/37382208/9296389
func getOutboundIP() net.IP {
conn, err := net.Dial("udp", "8.8.8.8:80")
if err != nil {
log.Fatal(err)
}
defer conn.Close()
localAddr, _ := conn.LocalAddr().(*net.UDPAddr)
return localAddr.IP
}
func (n WorkerQueue) Ping(group *servicegroup.ServiceGroup) error {
_, bErr, err := n.Send([]*queueing.ScoringData{
{
Service: queueing.QService{ID: uuid.Nil, Name: "PING", Group: group.Name}, MasterTime: time.Now(), Host: "localhost", Deadline: time.Now().Add(time.Second * 4), RoundID: 0, Properties: map[string]string{},
},
})
if err != nil {
return err
}
if bErr != nil {
return bErr
}
return nil
}
func (n WorkerQueue) Acknowledge(q queueing.QCheck) {
confp := nsq.NewConfig()
nsqProducerConfig(confp, n.config)
producer, err := nsq.NewProducer(n.config.NSQ.ProducerNSQD, confp)
if err != nil {
panic(err)
}
buf := &bytes.Buffer{}
if err := gob.NewEncoder(buf).Encode(&q); err != nil {
panic(err)
}
err = producer.Publish(q.Service.ReturningTopic, buf.Bytes())
if err != nil {
panic(err)
}
producer.Stop()
}
func NewNSQWorkerQueue(config queueing.Config) (*WorkerQueue, error) {
err := validateNSQConfig(config)
if err != nil {
return nil, err
}
return &WorkerQueue{config}, nil
}
//Todo: For Master-Worker Exchange Queue look into simplifying, and speeding up the process by utilizing single listening topic, and reusing the topic from round to round