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broadcast.go
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broadcast.go
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package service
import (
"encoding/json"
"fmt"
"github.com/dairlair/tweetwatch/pkg/entity"
log "github.com/sirupsen/logrus"
"time"
)
const (
broadcastingEventTweetSaved = "TweetSaved"
)
// BroadcasterInterface defines dependency which used for service configuration
// If service have a specified broadcaster then all processed tweets will be pushed to the broadcaster
type BroadcasterInterface interface {
Broadcast(channel string, data []byte)
}
func (service *Service) broadcast(tweetID int64, tweetStreams entity.TweetStreamsInterface) {
if service.broadcaster == nil {
return
}
tweet := tweetStreams.GetTweet()
bm := BroadcastMessage{
OriginTime: tweet.GetCreatedAt(),
OriginID: "twitter",
OriginEntity: "status",
OriginEntityID: fmt.Sprintf("%d", tweet.GetTwitterID()),
OriginText: tweet.GetFullText(),
OriginUserId: fmt.Sprintf("%d", tweet.GetTwitterUserID()),
OriginUsername: tweet.GetTwitterUsername(),
Streams: nil,
}
for _, stream := range tweetStreams.GetStreams() {
bm.Streams = append(bm.Streams, BroadcastStream{
StreamID: stream.GetID(),
TopicID: stream.GetTopicID(),
Track: stream.GetTrack(),
})
}
js, err := json.Marshal(bm)
if err != nil {
log.Errorf("Saved tweet marshalling failed: %s", err)
} else {
service.broadcaster.Broadcast(broadcastingEventTweetSaved, js)
}
}
// @TODO Move this structure definition into the Swagger Specification
type BroadcastStream struct {
StreamID int64 `json:"streamId"`
TopicID int64 `json:"topicId"`
Track string `json:"track"`
}
// @TODO Move this structure definition into the Swagger Specification
type BroadcastMessage struct {
OriginTime time.Time `json:"originTime,string"`
OriginID string `json:"originId"`
OriginEntity string `json:"originEntity"`
OriginEntityID string `json:"originEntityId"`
OriginText string `json:"originText"`
OriginUserId string `json:"originUserId"`
OriginUsername string `json:"originUsername"`
Streams []BroadcastStream `json:"streams"`
}