ntfy/server/cache_mem.go
2021-11-08 09:46:31 -05:00

80 lines
1.8 KiB
Go

package server
import (
_ "github.com/mattn/go-sqlite3" // SQLite driver
"sync"
"time"
)
type memCache struct {
messages map[string][]*message
mu sync.Mutex
}
var _ cache = (*memCache)(nil)
func newMemCache() *memCache {
return &memCache{
messages: make(map[string][]*message),
}
}
func (s *memCache) AddMessage(m *message) error {
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.messages[m.Topic]; !ok {
s.messages[m.Topic] = make([]*message, 0)
}
s.messages[m.Topic] = append(s.messages[m.Topic], m)
return nil
}
func (s *memCache) Messages(topic string, since sinceTime) ([]*message, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.messages[topic]; !ok {
return make([]*message, 0), nil
}
messages := make([]*message, 0) // copy!
for _, m := range s.messages[topic] {
msgTime := time.Unix(m.Time, 0)
if msgTime == since.Time() || msgTime.After(since.Time()) {
messages = append(messages, m)
}
}
return messages, nil
}
func (s *memCache) MessageCount(topic string) (int, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.messages[topic]; !ok {
return 0, nil
}
return len(s.messages[topic]), nil
}
func (s *memCache) Topics() (map[string]*topic, error) {
// Hack since we know when this is called there are no messages!
return make(map[string]*topic), nil
}
func (s *memCache) Prune(keep time.Duration) error {
s.mu.Lock()
defer s.mu.Unlock()
for topic, _ := range s.messages {
s.pruneTopic(topic, keep)
}
return nil
}
func (s *memCache) pruneTopic(topic string, keep time.Duration) {
for i, m := range s.messages[topic] {
msgTime := time.Unix(m.Time, 0)
if time.Since(msgTime) < keep {
s.messages[topic] = s.messages[topic][i:]
return
}
}
s.messages[topic] = make([]*message, 0) // all messages expired
}