/
app_stream.go
131 lines (110 loc) · 3.07 KB
/
app_stream.go
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package src
import (
"fmt"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
"scaffold/shared/interfaces"
"scaffold/shared/log"
confluent "github.com/confluentinc/confluent-kafka-go/kafka"
)
// ServeStream func
func (app *application) ServeStream(wg *sync.WaitGroup) {
app.runKafkaStreamServer(wg)
}
// RunStreamServer func
func (app *application) runKafkaStreamServer(wg *sync.WaitGroup) {
ctx := "app-RunKafkaStreamServer"
// start stream server
log.Log(log.InfoLevel, "Start Stream Server ...", ctx, "")
// run kafka consumer
app.kafkaConsumerRunner(wg)
}
func (app *application) kafkaConsumerRunner(wg *sync.WaitGroup) {
ctx := "app-kafkaConsumerRunner"
// setup consumer
if !app.Cfg().Debug() {
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, syscall.SIGINT, syscall.SIGTERM)
}
// get kafka stream deliveries
streams := app.deliveries.GetKafkaStreams()
for _, st := range streams {
// start consumer kafka
log.Log(log.InfoLevel, fmt.Sprintf("Start Consumer ::'%s' ...", st.GetGroup()), ctx, "get_consumer_delivery")
wg.Add(1)
go func(stream interfaces.DeliveryKafka) {
app.kafkaConsumer(stream)
wg.Done()
}(st)
}
// done initiate
log.Log(log.InfoLevel, "Server is ready!", ctx, "end_initial_stream_server")
}
func (app *application) kafkaConsumer(stream interfaces.DeliveryKafka) {
ctx := "app-kafkaConsumer"
consumer, err := confluent.NewConsumer(&confluent.ConfigMap{
"bootstrap.servers": stream.GetHost(),
// Avoid connecting to IPv6 brokers:
// This is needed for the ErrAllBrokersDown show-case below
// when using localhost brokers on OSX, since the OSX resolver
// will return the IPv6 addresses first.
// You typically don't need to specify this configuration property.
"broker.address.family": "v4",
"group.id": stream.GetGroup(),
"session.timeout.ms": 6000,
"auto.offset.reset": stream.GetOffset(),
})
if err != nil {
// TODO: set error
log.Log(
log.ErrorLevel,
err.Error(), ctx,
fmt.Sprintf("start_confluent_consumer_%s", stream.GetGroup()),
)
return
}
// close consumer
defer consumer.Close()
topics := strings.Split(stream.GetTopic(), ",")
err = consumer.SubscribeTopics(topics, nil)
if err != nil {
// TODO: set error
log.Log(
log.ErrorLevel,
err.Error(), ctx,
fmt.Sprintf("init_topic_%s", stream.GetTopic()),
)
return
}
// initial
log.Log(log.InfoLevel, fmt.Sprintf("Listening to topic ::'%s'\n", stream.GetTopic()), ctx, "")
run := true
for run == true {
msg, err := consumer.ReadMessage(-1)
if err == nil {
if app.Cfg().Debug() {
log.Log(log.InfoLevel, "msg retrived", ctx, "on_retrive_message")
}
err = stream.OnReceived(msg.Value)
if err != nil {
log.Log(
log.InfoLevel,
fmt.Sprintf("Got an error: %v \n (%v)", err, string(msg.Value)), ctx,
"error_on_retrieve_msg",
)
}
time.Sleep(1 * time.Second)
} else {
// The client will automatically try to recover from all errors.
log.Log(
log.ErrorLevel,
fmt.Sprintf("Consumer error: %v (%v)\n", err, msg), ctx,
"error_read_msg",
)
}
}
}