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package storage
import (
"context"
"database/sql"
"encoding/json"
"errors"
"fmt"
"github.com/klauspost/compress/zstd"
"google.golang.org/protobuf/proto"
pb "northwest.io/muxstr/api/nostr/v1"
)
var (
// ErrEventNotFound is returned when an event ID is not found in storage.
ErrEventNotFound = errors.New("event not found")
// ErrEventExists is returned when attempting to store a duplicate event.
ErrEventExists = errors.New("event already exists")
)
// EventData holds the data needed to store an event.
type EventData struct {
Event *pb.Event // Protobuf event
CanonicalJSON []byte // Uncompressed canonical JSON (will be compressed on storage)
}
// StoreEvent stores an event in the database.
// Returns ErrEventExists if the event ID already exists.
func (s *Storage) StoreEvent(ctx context.Context, data *EventData) error {
// Serialize protobuf
eventBytes, err := proto.Marshal(data.Event)
if err != nil {
return fmt.Errorf("failed to marshal event: %w", err)
}
// Compress canonical JSON
compressedJSON, err := compressJSON(data.CanonicalJSON)
if err != nil {
return fmt.Errorf("failed to compress canonical JSON: %w", err)
}
// Serialize tags to JSON
tagsJSON, err := marshalTags(data.Event.Tags)
if err != nil {
return fmt.Errorf("failed to marshal tags: %w", err)
}
// Insert event
query := `
INSERT INTO events (id, event_data, canonical_json, pubkey, kind, created_at, content, tags, sig)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
`
_, err = s.db.ExecContext(ctx, query,
data.Event.Id,
eventBytes,
compressedJSON,
data.Event.Pubkey,
data.Event.Kind,
data.Event.CreatedAt,
data.Event.Content,
tagsJSON,
data.Event.Sig,
)
if err != nil {
// Check for unique constraint violation (duplicate ID)
if isDuplicateError(err) {
return ErrEventExists
}
return fmt.Errorf("failed to insert event: %w", err)
}
return nil
}
// GetEvent retrieves an event by ID.
// Returns ErrEventNotFound if the event doesn't exist.
func (s *Storage) GetEvent(ctx context.Context, id string) (*pb.Event, error) {
query := `
SELECT event_data, canonical_json
FROM events
WHERE id = ? AND deleted = 0
`
var eventBytes, compressedJSON []byte
err := s.db.QueryRowContext(ctx, query, id).Scan(&eventBytes, &compressedJSON)
if err == sql.ErrNoRows {
return nil, ErrEventNotFound
}
if err != nil {
return nil, fmt.Errorf("failed to query event: %w", err)
}
// Deserialize protobuf
event := &pb.Event{}
if err := proto.Unmarshal(eventBytes, event); err != nil {
return nil, fmt.Errorf("failed to unmarshal event: %w", err)
}
return event, nil
}
// GetEventWithCanonical retrieves an event by ID with its canonical JSON.
// The canonical_json field will be populated in the returned event.
func (s *Storage) GetEventWithCanonical(ctx context.Context, id string) (*pb.Event, error) {
query := `
SELECT event_data, canonical_json
FROM events
WHERE id = ? AND deleted = 0
`
var eventBytes, compressedJSON []byte
err := s.db.QueryRowContext(ctx, query, id).Scan(&eventBytes, &compressedJSON)
if err == sql.ErrNoRows {
return nil, ErrEventNotFound
}
if err != nil {
return nil, fmt.Errorf("failed to query event: %w", err)
}
// Deserialize protobuf
event := &pb.Event{}
if err := proto.Unmarshal(eventBytes, event); err != nil {
return nil, fmt.Errorf("failed to unmarshal event: %w", err)
}
// Decompress canonical JSON
canonicalJSON, err := decompressJSON(compressedJSON)
if err != nil {
return nil, fmt.Errorf("failed to decompress canonical JSON: %w", err)
}
event.CanonicalJson = canonicalJSON
return event, nil
}
// DeleteEvent marks an event as deleted (soft delete).
func (s *Storage) DeleteEvent(ctx context.Context, eventID string) error {
query := `UPDATE events SET deleted = 1 WHERE id = ?`
result, err := s.db.ExecContext(ctx, query, eventID)
if err != nil {
return fmt.Errorf("failed to delete event: %w", err)
}
rows, err := result.RowsAffected()
if err != nil {
return fmt.Errorf("failed to get rows affected: %w", err)
}
if rows == 0 {
return ErrEventNotFound
}
return nil
}
// compressJSON compresses JSON bytes using zstd.
func compressJSON(data []byte) ([]byte, error) {
encoder, err := zstd.NewWriter(nil, zstd.WithEncoderLevel(zstd.SpeedDefault))
if err != nil {
return nil, err
}
defer encoder.Close()
return encoder.EncodeAll(data, nil), nil
}
// decompressJSON decompresses zstd-compressed JSON bytes.
func decompressJSON(data []byte) ([]byte, error) {
decoder, err := zstd.NewReader(nil)
if err != nil {
return nil, err
}
defer decoder.Close()
return decoder.DecodeAll(data, nil)
}
// marshalTags converts protobuf tags to JSON string.
func marshalTags(tags []*pb.Tag) (string, error) {
if len(tags) == 0 {
return "[]", nil
}
// Convert to [][]string for JSON serialization
tagArrays := make([][]string, len(tags))
for i, tag := range tags {
tagArrays[i] = tag.Values
}
data, err := json.Marshal(tagArrays)
if err != nil {
return "", err
}
return string(data), nil
}
// isDuplicateError checks if the error is a unique constraint violation.
func isDuplicateError(err error) bool {
if err == nil {
return false
}
// SQLite error messages for UNIQUE constraint violations
msg := err.Error()
return msg == "UNIQUE constraint failed: events.id" ||
msg == "constraint failed: UNIQUE constraint failed: events.id" ||
msg == "constraint failed: UNIQUE constraint failed: events.id (1555)"
}
|
