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|
package subscription
import (
"sync"
pb "northwest.io/nostr-grpc/api/nostr/v1"
)
type Subscription struct {
ID string
Filters []*pb.Filter
Events chan *pb.Event
done chan struct{}
once sync.Once
}
func (s *Subscription) InitDone() {
s.done = make(chan struct{})
}
func (s *Subscription) Done() <-chan struct{} {
return s.done
}
func (s *Subscription) Close() {
s.once.Do(func() {
close(s.done)
close(s.Events)
})
}
func (s *Subscription) IsClosed() bool {
select {
case <-s.done:
return true
default:
return false
}
}
type Manager struct {
mu sync.RWMutex
subscriptions map[string]*Subscription
}
func NewManager() *Manager {
return &Manager{
subscriptions: make(map[string]*Subscription),
}
}
func (m *Manager) Add(sub *Subscription) {
m.mu.Lock()
defer m.mu.Unlock()
m.subscriptions[sub.ID] = sub
}
func (m *Manager) Remove(id string) {
m.mu.Lock()
defer m.mu.Unlock()
if sub, ok := m.subscriptions[id]; ok {
sub.Close()
delete(m.subscriptions, id)
}
}
func (m *Manager) Get(id string) (*Subscription, bool) {
m.mu.RLock()
defer m.mu.RUnlock()
sub, ok := m.subscriptions[id]
return sub, ok
}
func (m *Manager) MatchAndFan(event *pb.Event) {
m.mu.RLock()
defer m.mu.RUnlock()
for _, sub := range m.subscriptions {
if sub.IsClosed() {
continue
}
if matchesAnyFilter(event, sub.Filters) {
select {
case sub.Events <- event:
case <-sub.done:
default:
}
}
}
}
func matchesAnyFilter(event *pb.Event, filters []*pb.Filter) bool {
for _, filter := range filters {
if matchesFilter(event, filter) {
return true
}
}
return false
}
func matchesFilter(event *pb.Event, filter *pb.Filter) bool {
if len(filter.Ids) > 0 {
if !matchesPrefix(event.Id, filter.Ids) {
return false
}
}
if len(filter.Authors) > 0 {
if !matchesPrefix(event.Pubkey, filter.Authors) {
return false
}
}
if len(filter.Kinds) > 0 {
found := false
for _, kind := range filter.Kinds {
if event.Kind == kind {
found = true
break
}
}
if !found {
return false
}
}
if filter.Since != nil && *filter.Since > 0 {
if event.CreatedAt < *filter.Since {
return false
}
}
if filter.Until != nil && *filter.Until > 0 {
if event.CreatedAt > *filter.Until {
return false
}
}
if len(filter.ETags) > 0 {
if !hasTag(event, "e", filter.ETags) {
return false
}
}
if len(filter.PTags) > 0 {
if !hasTag(event, "p", filter.PTags) {
return false
}
}
for tagName, tagFilter := range filter.TagFilters {
if len(tagFilter.Values) > 0 {
if !hasTag(event, tagName, tagFilter.Values) {
return false
}
}
}
return true
}
func matchesPrefix(value string, prefixes []string) bool {
for _, prefix := range prefixes {
if len(prefix) == len(value) {
if value == prefix {
return true
}
} else if len(value) > len(prefix) {
if value[:len(prefix)] == prefix {
return true
}
}
}
return false
}
func hasTag(event *pb.Event, tagName string, values []string) bool {
for _, tag := range event.Tags {
if len(tag.Values) >= 2 && tag.Values[0] == tagName {
for _, val := range values {
if tag.Values[1] == val {
return true
}
}
}
}
return false
}
|
