104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
package postgres
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import (
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"context"
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"errors"
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"fmt"
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"github.com/jackc/pgx/v5"
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"telesrv/internal/domain"
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"telesrv/internal/store"
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"telesrv/internal/store/postgres/sqlcgen"
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)
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// ReadModelVersionStore reads durable read-model version tokens.
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type ReadModelVersionStore struct {
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db sqlcgen.DBTX
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}
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func NewReadModelVersionStore(db sqlcgen.DBTX) *ReadModelVersionStore {
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return &ReadModelVersionStore{db: db}
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}
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func (s *ReadModelVersionStore) ReadModelHash(ctx context.Context, model string, ownerUserID int64, peerType domain.PeerType, peerID int64) (int64, bool, error) {
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if s == nil || s.db == nil || model == "" {
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return 0, false, nil
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}
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var hash int64
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err := s.db.QueryRow(ctx, `
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SELECT hash
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FROM read_model_versions
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WHERE model = $1
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AND owner_user_id = $2
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AND peer_type = $3
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AND peer_id = $4
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`, model, ownerUserID, string(peerType), peerID).Scan(&hash)
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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return 0, false, nil
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}
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return 0, false, fmt.Errorf("read model hash: %w", err)
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}
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return hash, hash != 0, nil
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}
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func (s *ReadModelVersionStore) ReadModelHashes(ctx context.Context, keys []store.ReadModelKey) (map[store.ReadModelKey]int64, error) {
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out := make(map[store.ReadModelKey]int64, len(keys))
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if s == nil || s.db == nil || len(keys) == 0 {
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return out, nil
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}
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models := make([]string, 0, len(keys))
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owners := make([]int64, 0, len(keys))
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peerTypes := make([]string, 0, len(keys))
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peerIDs := make([]int64, 0, len(keys))
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seen := make(map[store.ReadModelKey]struct{}, len(keys))
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for _, key := range keys {
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if key.Model == "" {
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continue
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}
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if _, ok := seen[key]; ok {
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continue
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}
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seen[key] = struct{}{}
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models = append(models, key.Model)
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owners = append(owners, key.OwnerUserID)
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peerTypes = append(peerTypes, string(key.PeerType))
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peerIDs = append(peerIDs, key.PeerID)
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}
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if len(models) == 0 {
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return out, nil
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}
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rows, err := s.db.Query(ctx, `
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WITH requested AS (
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SELECT *
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FROM unnest($1::text[], $2::bigint[], $3::text[], $4::bigint[])
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AS r(model, owner_user_id, peer_type, peer_id)
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)
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SELECT v.model, v.owner_user_id, v.peer_type, v.peer_id, v.hash
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FROM requested r
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JOIN read_model_versions v
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ON v.model = r.model
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AND v.owner_user_id = r.owner_user_id
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AND v.peer_type = r.peer_type
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AND v.peer_id = r.peer_id
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WHERE v.hash <> 0`, models, owners, peerTypes, peerIDs)
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if err != nil {
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return nil, fmt.Errorf("read model hashes: %w", err)
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}
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defer rows.Close()
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for rows.Next() {
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var key store.ReadModelKey
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var peerType string
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var hash int64
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if err := rows.Scan(&key.Model, &key.OwnerUserID, &peerType, &key.PeerID, &hash); err != nil {
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return nil, fmt.Errorf("scan read model hash: %w", err)
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}
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key.PeerType = domain.PeerType(peerType)
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out[key] = hash
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}
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if err := rows.Err(); err != nil {
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return nil, fmt.Errorf("read model hashes: %w", err)
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}
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return out, nil
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}
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