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package grpc
import (
"context"
"crypto/rand"
"fmt"
pb "northwest.io/nostr-grpc/api/nostr/v1"
"northwest.io/nostr-grpc/internal/storage"
"northwest.io/nostr-grpc/internal/subscription"
)
type EventStore interface {
StoreEvent(context.Context, *storage.EventData) error
QueryEvents(context.Context, []*pb.Filter, *storage.QueryOptions) ([]*pb.Event, error)
ProcessDeletion(context.Context, *pb.Event) error
}
type Server struct {
pb.UnimplementedNostrRelayServer
store EventStore
subs *subscription.Manager
}
func NewServer(store EventStore) *Server {
return &Server{
store: store,
subs: subscription.NewManager(),
}
}
func (s *Server) SetSubscriptionManager(mgr *subscription.Manager) {
s.subs = mgr
}
func (s *Server) PublishEvent(ctx context.Context, req *pb.PublishEventRequest) (*pb.PublishEventResponse, error) {
if req.Event == nil {
return &pb.PublishEventResponse{
Accepted: false,
Message: "event is required",
}, nil
}
nostrEvent := PBToNostr(req.Event)
if !nostrEvent.CheckID() {
return &pb.PublishEventResponse{
Accepted: false,
Message: "invalid event ID",
}, nil
}
if !nostrEvent.Verify() {
return &pb.PublishEventResponse{
Accepted: false,
Message: "invalid signature",
}, nil
}
canonicalJSON := nostrEvent.Serialize()
eventData := &storage.EventData{
Event: req.Event,
CanonicalJSON: canonicalJSON,
}
err := s.store.StoreEvent(ctx, eventData)
if err == storage.ErrEventExists {
return &pb.PublishEventResponse{
Accepted: false,
Message: "duplicate: event already exists",
CanonicalJson: canonicalJSON,
}, nil
}
if err != nil {
return nil, fmt.Errorf("failed to store event: %w", err)
}
if req.Event.Kind == 5 {
if err := s.store.ProcessDeletion(ctx, req.Event); err != nil {
return &pb.PublishEventResponse{
Accepted: false,
Message: fmt.Sprintf("deletion processing failed: %v", err),
CanonicalJson: canonicalJSON,
}, nil
}
}
s.subs.MatchAndFan(req.Event)
return &pb.PublishEventResponse{
Accepted: true,
Message: "success",
CanonicalJson: canonicalJSON,
}, nil
}
func (s *Server) QueryEvents(ctx context.Context, req *pb.QueryRequest) (*pb.QueryResponse, error) {
opts := &storage.QueryOptions{
IncludeCanonical: req.IncludeCanonicalJson,
Limit: req.PageSize,
}
if opts.Limit == 0 {
opts.Limit = 100
}
events, err := s.store.QueryEvents(ctx, req.Filters, opts)
if err != nil {
return nil, fmt.Errorf("query failed: %w", err)
}
return &pb.QueryResponse{
Events: events,
}, nil
}
func (s *Server) CountEvents(ctx context.Context, req *pb.CountRequest) (*pb.CountResponse, error) {
events, err := s.store.QueryEvents(ctx, req.Filters, &storage.QueryOptions{Limit: 0})
if err != nil {
return nil, fmt.Errorf("count failed: %w", err)
}
return &pb.CountResponse{
Count: int64(len(events)),
}, nil
}
func (s *Server) PublishBatch(ctx context.Context, req *pb.PublishBatchRequest) (*pb.PublishBatchResponse, error) {
results := make([]*pb.PublishEventResponse, len(req.Events))
for i, event := range req.Events {
resp, err := s.PublishEvent(ctx, &pb.PublishEventRequest{Event: event})
if err != nil {
return nil, err
}
results[i] = resp
}
return &pb.PublishBatchResponse{
Results: results,
}, nil
}
func (s *Server) Subscribe(req *pb.SubscribeRequest, stream pb.NostrRelay_SubscribeServer) error {
subID := req.SubscriptionId
if subID == "" {
subID = generateSubID()
}
sub := &subscription.Subscription{
ID: subID,
Filters: req.Filters,
Events: make(chan *pb.Event, 100),
}
sub.InitDone()
s.subs.Add(sub)
defer s.subs.Remove(subID)
opts := &storage.QueryOptions{
IncludeCanonical: req.IncludeCanonicalJson,
Limit: 0,
}
storedEvents, err := s.store.QueryEvents(stream.Context(), req.Filters, opts)
if err != nil {
return fmt.Errorf("query failed: %w", err)
}
for _, event := range storedEvents {
if err := stream.Send(event); err != nil {
return err
}
}
for {
select {
case event, ok := <-sub.Events:
if !ok {
return nil
}
eventToSend := event
if req.IncludeCanonicalJson && event.CanonicalJson == nil {
return fmt.Errorf("canonical JSON requested but not available")
}
if err := stream.Send(eventToSend); err != nil {
return err
}
case <-stream.Context().Done():
return stream.Context().Err()
case <-sub.Done():
return nil
}
}
}
func (s *Server) Unsubscribe(ctx context.Context, req *pb.UnsubscribeRequest) (*pb.Empty, error) {
s.subs.Remove(req.SubscriptionId)
return &pb.Empty{}, nil
}
func generateSubID() string {
b := make([]byte, 8)
rand.Read(b)
return fmt.Sprintf("%x", b)
}
|
