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package storage
import (
"context"
"fmt"
"strings"
"google.golang.org/protobuf/proto"
pb "northwest.io/nostr-grpc/api/nostr/v1"
)
type QueryOptions struct {
IncludeCanonical bool
Limit int32
}
func (s *Storage) QueryEvents(ctx context.Context, filters []*pb.Filter, opts *QueryOptions) ([]*pb.Event, error) {
if len(filters) == 0 {
return nil, nil
}
if opts == nil {
opts = &QueryOptions{Limit: 100}
}
query, args := buildQuery(filters, opts)
rows, err := s.db.QueryContext(ctx, query, args...)
if err != nil {
return nil, fmt.Errorf("query failed: %w", err)
}
defer rows.Close()
var events []*pb.Event
for rows.Next() {
var eventBytes []byte
var compressedJSON []byte
var createdAt int64
if opts.IncludeCanonical {
if err := rows.Scan(&eventBytes, &compressedJSON, &createdAt); err != nil {
return nil, fmt.Errorf("scan failed: %w", err)
}
} else {
if err := rows.Scan(&eventBytes, &createdAt); err != nil {
return nil, fmt.Errorf("scan failed: %w", err)
}
}
event := &pb.Event{}
if err := proto.Unmarshal(eventBytes, event); err != nil {
return nil, fmt.Errorf("unmarshal failed: %w", err)
}
if opts.IncludeCanonical && compressedJSON != nil {
canonicalJSON, err := decompressJSON(compressedJSON)
if err != nil {
return nil, fmt.Errorf("decompress failed: %w", err)
}
event.CanonicalJson = canonicalJSON
}
events = append(events, event)
}
if err := rows.Err(); err != nil {
return nil, fmt.Errorf("rows iteration failed: %w", err)
}
return events, nil
}
func buildQuery(filters []*pb.Filter, opts *QueryOptions) (string, []interface{}) {
selectFields := "event_data, created_at"
if opts.IncludeCanonical {
selectFields = "event_data, canonical_json, created_at"
}
var unions []string
var args []interface{}
for _, filter := range filters {
clause, filterArgs := buildWhereClause(filter)
subQuery := fmt.Sprintf("SELECT %s FROM events WHERE deleted = 0 AND (%s)", selectFields, clause)
unions = append(unions, subQuery)
args = append(args, filterArgs...)
}
query := strings.Join(unions, " UNION ")
query += " ORDER BY created_at DESC"
if opts.Limit > 0 {
query += fmt.Sprintf(" LIMIT %d", opts.Limit)
}
return query, args
}
func buildWhereClause(filter *pb.Filter) (string, []interface{}) {
var conditions []string
var args []interface{}
if len(filter.Ids) > 0 {
conditions = append(conditions, buildPrefixCondition("id", filter.Ids, &args))
}
if len(filter.Authors) > 0 {
conditions = append(conditions, buildPrefixCondition("pubkey", filter.Authors, &args))
}
if len(filter.Kinds) > 0 {
placeholders := make([]string, len(filter.Kinds))
for i, kind := range filter.Kinds {
placeholders[i] = "?"
args = append(args, kind)
}
conditions = append(conditions, fmt.Sprintf("kind IN (%s)", strings.Join(placeholders, ",")))
}
if filter.Since != nil && *filter.Since > 0 {
conditions = append(conditions, "created_at >= ?")
args = append(args, *filter.Since)
}
if filter.Until != nil && *filter.Until > 0 {
conditions = append(conditions, "created_at <= ?")
args = append(args, *filter.Until)
}
if len(filter.ETags) > 0 {
conditions = append(conditions, buildTagCondition("e", filter.ETags, &args))
}
if len(filter.PTags) > 0 {
conditions = append(conditions, buildTagCondition("p", filter.PTags, &args))
}
for tagName, tagFilter := range filter.TagFilters {
if len(tagFilter.Values) > 0 {
conditions = append(conditions, buildTagCondition(tagName, tagFilter.Values, &args))
}
}
if len(conditions) == 0 {
return "1=1", args
}
return strings.Join(conditions, " AND "), args
}
func buildPrefixCondition(column string, values []string, args *[]interface{}) string {
var orConditions []string
for _, val := range values {
if len(val) == 64 {
orConditions = append(orConditions, column+" = ?")
*args = append(*args, val)
} else {
orConditions = append(orConditions, column+" LIKE ?")
*args = append(*args, val+"%")
}
}
if len(orConditions) == 1 {
return orConditions[0]
}
return "(" + strings.Join(orConditions, " OR ") + ")"
}
func buildTagCondition(tagName string, values []string, args *[]interface{}) string {
var orConditions []string
for _, val := range values {
orConditions = append(orConditions, "EXISTS (SELECT 1 FROM json_each(tags) WHERE json_extract(value, '$[0]') = ? AND json_extract(value, '$[1]') = ?)")
*args = append(*args, tagName, val)
}
if len(orConditions) == 1 {
return orConditions[0]
}
return "(" + strings.Join(orConditions, " OR ") + ")"
}
|
