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package main
import (
"fmt"
"log"
mqtt "github.com/eclipse/paho.mqtt.golang"
)
type States map[string]bool
type Cache struct {
Client mqtt.Client
States map[string]bool
}
func NewCache(client mqtt.Client) Cache {
var cache Cache
cache.Client = client
cache.States = make(States)
return cache
}
func (c *Cache) Update(states States) {
if c.States == nil {
log.Fatal("Cache states is nil.")
}
if states == nil {
log.Fatal("Given states is nil.")
}
for id, state := range states {
cached, known := c.States[id]
if !known || cached != state {
topic := fmt.Sprintf("%s/contact/%s/state", TOPIC_PREFIX, id)
payload := []byte(fmt.Sprintf("%t", state))
_ = c.Client.Publish(topic, QOS, RETAINED, payload)
}
c.States[id] = state
}
}
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