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package main
import (
"fmt"
"log"
)
type States map[string]bool
type Cache struct {
Tx chan MQTTMessage
States map[string]bool
}
func NewCache(tx chan MQTTMessage) Cache {
var cache Cache
cache.Tx = tx
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)
var payload []byte
if state == true {
payload = []byte("open")
} else {
payload = []byte("closed")
}
c.Tx <- MQTTMessage{
Topic: topic,
Payload: payload,
}
}
c.States[id] = state
}
}
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