res_levis_backend/internal/pkg/mqtt_client/processor.go

package mqtt_client

import (
	"log"
	"time"

	"github.com/AFASystems/presence/internal/pkg/model"
	"github.com/AFASystems/presence/internal/pkg/persistence"
	"github.com/boltdb/bolt"
	"github.com/yosssi/gmq/mqtt/client"
)

func IncomingMQTTProcessor(updateInterval time.Duration, cl *client.Client, db *bolt.DB, ctx *model.AppContext) chan<- model.Incoming_json {
	ch := make(chan model.Incoming_json, 2000)
	persistence.CreateBucketIfNotExists(db)

	ticker := time.NewTicker(updateInterval)
	go runProcessor(ticker, cl, ch, ctx)

	return ch
}

func runProcessor(ticker *time.Ticker, cl *client.Client, ch <-chan model.Incoming_json, ctx *model.AppContext) {
	for {
		select {
		case <-ticker.C:
			getLikelyLocations(&ctx.Settings, ctx, cl)
		case incoming := <-ch:
			processIncoming(incoming, cl, ctx)
		}
	}
}

func processIncoming(incoming model.Incoming_json, cl *client.Client, ctx *model.AppContext) {
	defer func() {
		if err := recover(); err != nil {
			log.Println("work failed:", err)
		}
	}()

	incoming = incomingBeaconFilter(incoming) // DONE
	id := getBeaconID(incoming)               // DONE
	now := time.Now().Unix()

	beacons := &ctx.Beacons

	beacons.Lock.Lock()
	defer beacons.Lock.Unlock()

	latestList := &ctx.LatestList
	settings := &ctx.Settings

	beacon, ok := beacons.Beacons[id]
	if !ok {
		updateLatestList(incoming, now, latestList) // DONE
		return
	}

	updateBeaconData(&beacon, incoming, now, cl, settings)
	beacons.Beacons[beacon.Beacon_id] = beacon
}