func listenToOpLog(subHubs []*subscriptionHub) {
//Address of where the database for mongo is located
//in this case it is on the same machine
session, err := mgo.Dial("localhost")
if err != nil {
panic(err)
}
defer session.Close()
session.SetMode(mgo.Monotonic, true)
ops, errs := gtm.Tail(session, >m.Options{
Filter: filterLog,
})
for {
select {
case err := <-errs:
fmt.Println(err)
case op := <-ops:
name, nameOk := op.Data["name"].(string)
value, valueOk := op.Data["value"].(float64)
if nameOk && valueOk {
for _, subHub := range subHubs {
subHub.events <- &event{
Name: name,
Value: value,
}
}
} else {
fmt.Println("name: ", nameOk, " value: ", valueOk)
fmt.Println(op.Data)
}
}
}
}
func main() {
db, err := mgo.Dial(os.Getenv("MONGO_URL"))
if err != nil {
log.Error("Failed to connect to MongoDB", "error", err)
os.Exit(1)
return
}
defer db.Close()
ops, errs := gtm.Tail(db, >m.Options{
OpLogCollectionName: &OplogCollection,
Filter: func(op *gtm.Op) bool {
return op.Namespace == "dg.lists"
},
})
for {
select {
case err = <-errs:
log.Error("Error from oplog tail", "error", err)
case <-ops:
log.Info("Change event")
Reload()
}
}
}