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server.go
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server.go
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package main
import (
"context"
"fmt"
"net/http"
"os"
"strings"
// "syscall"
// "os/signal"
// "encoding/json"
"time"
// "github.com/Shopify/sarama"
"github.com/bptlab/cepta/ci/versioning"
"github.com/bptlab/cepta/constants"
delay "github.com/bptlab/cepta/models/events/traindelaynotificationevent"
libcli "github.com/bptlab/cepta/osiris/lib/cli"
kafkaconsumer "github.com/bptlab/cepta/osiris/lib/kafka/consumer"
"github.com/bptlab/cepta/osiris/notification/websocket"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
log "github.com/sirupsen/logrus"
"github.com/urfave/cli/v2"
)
var marshaler = &jsonpb.Marshaler{EmitDefaults: true}
// TODO: Protobuf schema will replace this test Message with actual message send through the kafka queue
type Message struct {
UID int
Message string
}
func serveWebsocket(pool *websocket.Pool, w http.ResponseWriter, r *http.Request) {
log.Debug("WebSocket Endpoint Request")
conn, err := websocket.Upgrade(w, r)
if err != nil {
log.Error(w, "%+v\n", err)
}
client := &websocket.Client{
Conn: conn,
Pool: pool,
}
pool.Register <- client
client.Read()
}
func subscribeKafkaToPool(ctx context.Context, pool *websocket.Pool, options kafkaconsumer.KafkaConsumerOptions) {
if !(len(options.Topics) == 1 && len(options.Topics[0]) > 0) {
options.Topics = []string{constants.Topics_DELAY_NOTIFICATIONS.String()}
}
if options.Group == "" {
options.Group = "DelayConsumerGroup"
}
log.Infof("Will consume topic %s from %s (group %s)", options.Topics, strings.Join(options.Brokers, ", "), options.Group)
kafkaConsumer, err := kafkaconsumer.ConsumeKafkaGroup(ctx, options)
if err != nil {
log.Fatalf("Failed to connect to kafka broker (%s) (group %s) on topic %s: %s",
strings.Join(options.Brokers, ", "), options.Group, options.Topics, err.Error())
}
noopTicker := time.NewTicker(time.Second * 10)
subscriberDone := make(chan bool, 1)
stopSubscriber := make(chan bool, 1)
go func() {
defer func() { subscriberDone <- true }()
for {
select {
case msg := <-kafkaConsumer.Messages: // kafkaConsumer.Messages():
// payload := msg.Value
// log.Info("Got delay message")
// log.Info(string(msg.Value))
// Converting []byte payload to JSON
// var message Message
// json.Unmarshal(payload, &message)
delayEvent := &delay.TrainDelayNotification{}
err = proto.Unmarshal(msg.Value, delayEvent)
if err != nil {
log.Errorf("unmarshaling error: ", err)
}
log.Info(delayEvent)
pool.Broadcast <- msg.Value
/*
jsonMessage, err := marshaler.MarshalToString(delayEvent)
if err != nil {
log.Errorf("json marshal error: ", err)
} else {
pool.Broadcast <- jsonMessage
}
*/
/*
for client, _ := range pool.Clients {
if client.ID == message.UID {
client.Conn.WriteJSON(websocket.Message{Type: 4, Body: string(payload)})
}
}
*/
break
case <-noopTicker.C:
// message := websocket.Message{Type: 2, Body: "ping"}
// pool.Broadcast <- message
case <-stopSubscriber:
return
}
}
}()
<-subscriberDone
noopTicker.Stop()
/*
consumer, err := kafkaClient.Consume(ctx, topics, 0, sarama.OffsetOldest)
if err != nil {
log.Fatalf("Failed to consume topic %s: %s", topic, err.Error())
}
*/
/*
config := sarama.NewConfig()
config.Consumer.Return.Errors = true
// Specify brokers address
// brokers := []string{"localhost:29092"}
// Create new consumer
master, err := sarama.NewConsumer(brokers, config)
if err != nil {
panic(err)
}
defer func() {
if err := master.Close(); err != nil {
panic(err)
}
}()
topic := "news_for_leo"
consumer, err := master.ConsumePartition(topic, 0, sarama.OffsetOldest)
if err != nil {
panic(err)
}
// start consumer, emit to ws
noopTicker := time.NewTicker(time.Second * 10)
subscriberDone := make(chan bool, 1)
stopSubscriber := make(chan bool, 1)
go func() {
defer func() { subscriberDone <- true }()
for {
select {
case msg := <-consumer.Messages():
payload := msg.Value
// Converting []byte payload to JSON
var message Message
json.Unmarshal(payload, &message)
for client, _ := range pool.Clients {
if client.ID == message.UID {
client.Conn.WriteJSON(websocket.Message{Type: 4, Body: string(payload)})
}
}
break
case <-noopTicker.C:
message := websocket.Message{Type: 2, Body: "ping"}
pool.Broadcast <- message
case <-stopSubscriber:
return
}
}
}()
<-subscriberDone
noopTicker.Stop()
*/
}
func serve(cliCtx *cli.Context) error {
ctx, _ := context.WithCancel(context.Background()) // cancel
kafkaOptions := kafkaconsumer.KafkaConsumerOptions{}.ParseCli(cliCtx)
pool := websocket.NewPool()
go pool.Start()
go subscribeKafkaToPool(ctx, pool, kafkaOptions)
http.HandleFunc("/ws/userdata", func(w http.ResponseWriter, r *http.Request) {
serveWebsocket(pool, w, r)
})
port := fmt.Sprintf(":%d", cliCtx.Int("port"))
log.Printf("Server ready at %s", port)
log.Fatal(http.ListenAndServe(port, nil))
/*
sigterm := make(chan os.Signal, 1)
signal.Notify(sigterm, syscall.SIGINT, syscall.SIGTERM)
select {
case <-ctx.Done():
log.Info("terminating: context cancelled")
case <-sigterm:
log.Info("terminating: via signal")
}
cancel()
wg.Wait()
if err = client.Close(); err != nil {
log.Panicf("Error closing client: %v", err)
}
*/
return nil
}
func main() {
cliFlags := []cli.Flag{}
cliFlags = append(cliFlags, libcli.CommonCliOptions(libcli.ServicePort, libcli.ServiceLogLevel)...)
cliFlags = append(cliFlags, kafkaconsumer.KafkaConsumerCliOptions...)
app := &cli.App{
Name: "CEPTA Notification service",
Version: versioning.GetVersion(),
Usage: "The service sets up the websocket connection and subscription to kafka",
Flags: cliFlags,
Action: func(ctx *cli.Context) error {
level, err := log.ParseLevel(ctx.String("log"))
if err != nil {
log.Warnf("Log level '%s' does not exist.")
level = log.InfoLevel
}
log.SetLevel(level)
ret := serve(ctx)
return ret
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}