/
service.go
102 lines (81 loc) · 1.69 KB
/
service.go
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package events
import (
"context"
"errors"
"fmt"
"sync"
"gorm.io/gorm"
)
const (
defaultCacheSize = 1000
)
// todo: add unit tests
type DataProvider interface {
Create(RegisteredEvent) error
Update(RegisteredEvent) error
GetByTypeAndEvent(string, string, string) (*RegisteredEvent, error)
GetLast(limit int) ([]*RegisteredEvent, error)
}
type Service struct {
repo DataProvider
mu sync.RWMutex
cache map[string]struct{}
}
func NewService(r DataProvider) (*Service, error) {
s := &Service{
repo: r,
cache: make(map[string]struct{}, defaultCacheSize),
}
s.fillCache(defaultCacheSize)
return s, nil
}
func (s *Service) fillCache(limit int) {
items, err := s.repo.GetLast(limit)
if err != nil {
return
}
s.mu.Lock()
defer s.mu.Unlock()
for _, p := range items {
key := prepareKey(p.TypeID, p.Type, p.Event)
s.cache[key] = struct{}{}
}
}
func (s *Service) EventExist(_ context.Context, id, t, event string) (bool, error) {
key := prepareKey(id, t, event)
s.mu.RLock()
_, ok := s.cache[key]
s.mu.RUnlock()
if ok {
return true, nil
}
_, err := s.repo.GetByTypeAndEvent(id, t, event)
if err == nil {
s.mu.Lock()
s.cache[key] = struct{}{}
s.mu.Unlock()
return true, nil
}
if errors.Is(err, gorm.ErrRecordNotFound) {
return false, nil
}
return false, err
}
func (s *Service) RegisterEvent(_ context.Context, id, t, event string) error {
err := s.repo.Create(RegisteredEvent{
Type: t,
TypeID: id,
Event: event,
})
if err != nil {
return err
}
key := prepareKey(id, t, event)
s.mu.Lock()
s.cache[key] = struct{}{}
s.mu.Unlock()
return nil
}
func prepareKey(id, t, event string) string {
return fmt.Sprintf("%s_%s_%s", id, t, event)
}