forked from hsg4ok/mqtt
/
retainedmessages.go
73 lines (63 loc) · 1.52 KB
/
retainedmessages.go
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package mqtt
import (
// "fmt"
"errors"
"regexp"
"os"
"syscall"
)
type RetainedMessages struct {
_messageCache map[Topic]*RetainedMessage
path string
}
func (rm *RetainedMessages) loadAll(path string) error {
// #SLASH#
}
func (rm *RetainedMessages) load(path string) error {
}
func (rm RetainedMessages) save(msg RetainedMessage) error {
}
func (rm *RetainedMessages) messageCache() map[Topic]*RetainedMessage {
if rm._messageCache == nil {
rm._messageCache = make(map[Topic]*RetainedMessage)
}
return rm._messageCache
}
func (rm *RetainedMessages) add(msg RetainedMessage) error {
if rm == nil {
return errors.New("retainedmessages nil")
}
t := msg.PublishPacket.Topic
if t == "" {
rm.remove(t)
return nil
}
rm.messageCache()[t] = &msg
return msg.save(rm.path)
}
func (rm *RetainedMessages) remove(t Topic) {
if rm._messageCache != nil {
delete(rm._messageCache, t)
}
// look for it on disk
syscall.Unlink(topicToFilename(rm.path, t))
}
func (rm *RetainedMessages) loadRetainedMessageForTopic(t Topic) *RetainedMessage {
msg := loadRetainedMessage(rm.path, t)
if msg != nil {
rm.messageCache()[t] = msg
}
return msg
}
func (rm *RetainedMessages) get(t Topic) *RetainedMessage {
if rm == nil {
return nil
}
if rm.messageCache != nil {
msg := rm.messageCache[t]
if msg != nil {
return msg
}
}
return rm.loadRetainedMessageForTopic(t)
}