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postgres_store.go
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/
postgres_store.go
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package fileset
import (
"context"
"database/sql"
"testing"
"time"
lru "github.com/hashicorp/golang-lru/v2"
"github.com/jmoiron/sqlx"
"github.com/pachyderm/pachyderm/v2/src/internal/backoff"
"github.com/pachyderm/pachyderm/v2/src/internal/errors"
"github.com/pachyderm/pachyderm/v2/src/internal/miscutil"
"github.com/pachyderm/pachyderm/v2/src/internal/pacherr"
"github.com/pachyderm/pachyderm/v2/src/internal/pachsql"
"github.com/pachyderm/pachyderm/v2/src/internal/require"
"google.golang.org/protobuf/proto"
)
var _ MetadataStore = &postgresStore{}
type postgresStore struct {
db *pachsql.DB
cache *lru.Cache[ID, *Metadata]
deduper *miscutil.WorkDeduper[ID]
}
// NewPostgresStore returns a Store backed by db
// TODO: Expose configuration for cache size?
func NewPostgresStore(db *pachsql.DB) MetadataStore {
mc, err := lru.New[ID, *Metadata](100)
if err != nil {
panic(err)
}
return &postgresStore{
db: db,
cache: mc,
deduper: &miscutil.WorkDeduper[ID]{},
}
}
func (s *postgresStore) DB() *pachsql.DB {
return s.db
}
func (s *postgresStore) SetTx(tx *pachsql.Tx, id ID, md *Metadata) error {
if md == nil {
md = &Metadata{}
}
data, err := proto.Marshal(md)
if err != nil {
return errors.EnsureStack(err)
}
res, err := tx.Exec(
`INSERT INTO storage.filesets (id, metadata_pb)
VALUES ($1, $2)
ON CONFLICT (id) DO NOTHING
`, id, data)
if err != nil {
return errors.EnsureStack(err)
}
n, err := res.RowsAffected()
if err != nil {
return errors.EnsureStack(err)
}
if n == 0 {
return errors.WithStack(ErrFileSetExists)
}
return nil
}
func (s *postgresStore) get(ctx context.Context, q sqlx.QueryerContext, id ID) (*Metadata, error) {
var mdData []byte
if err := sqlx.GetContext(ctx, q, &mdData, `SELECT metadata_pb FROM storage.filesets WHERE id = $1`, id); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, errors.WithStack(ErrFileSetNotExists)
}
return nil, errors.EnsureStack(err)
}
md := &Metadata{}
if err := proto.Unmarshal(mdData, md); err != nil {
return nil, errors.EnsureStack(err)
}
return md, nil
}
func (s *postgresStore) Get(ctx context.Context, id ID) (*Metadata, error) {
md, err := s.getFromCache(id)
if err == nil {
return md, err
}
b := backoff.NewExponentialBackOff()
b.InitialInterval = 1 * time.Millisecond
if err := backoff.RetryUntilCancel(ctx, func() error {
var err error
md, err = s.getFromCache(id)
return err
}, b, func(err error, _ time.Duration) error {
if !pacherr.IsNotExist(err) {
return err
}
return s.deduper.Do(ctx, id, func() error {
md, err := s.get(ctx, s.db, id)
if err != nil {
return err
}
s.putInCache(id, md)
return nil
})
}); err != nil {
return nil, err
}
return md, nil
}
func (s *postgresStore) getFromCache(id ID) (*Metadata, error) {
md, ok := s.cache.Get(id)
if !ok {
return nil, pacherr.NewNotExist("memory-filesets", id.HexString())
}
return proto.Clone(md).(*Metadata), nil
}
func (s *postgresStore) putInCache(id ID, md *Metadata) {
md = proto.Clone(md).(*Metadata)
s.cache.Add(id, md)
}
func (s *postgresStore) GetTx(tx *pachsql.Tx, id ID) (*Metadata, error) {
return s.get(context.Background(), tx, id)
}
func (s *postgresStore) DeleteTx(tx *pachsql.Tx, id ID) error {
_, err := tx.Exec(`DELETE FROM storage.filesets WHERE id = $1`, id)
return errors.EnsureStack(err)
}
func (s *postgresStore) Exists(ctx context.Context, id ID) (bool, error) {
_, err := s.get(ctx, s.db, id)
if err != nil {
if errors.Is(err, ErrFileSetNotExists) {
return false, nil
}
return false, err
}
return true, nil
}
// SetupPostgresStoreV0 sets up the tables for a Store
// DO NOT MODIFY THIS FUNCTION
// IT HAS BEEN USED IN A RELEASED MIGRATION
func SetupPostgresStoreV0(ctx context.Context, tx *pachsql.Tx) error {
const schema = `
CREATE TABLE storage.filesets (
id UUID NOT NULL PRIMARY KEY,
metadata_pb BYTEA NOT NULL,
created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);
`
_, err := tx.ExecContext(ctx, schema)
return errors.EnsureStack(err)
}
// NewTestStore returns a Store scoped to the lifetime of the test.
func NewTestStore(ctx context.Context, t testing.TB, db *pachsql.DB) MetadataStore {
tx := db.MustBegin()
tx.MustExec(`CREATE SCHEMA IF NOT EXISTS storage`)
require.NoError(t, SetupPostgresStoreV0(ctx, tx))
require.NoError(t, tx.Commit())
return NewPostgresStore(db)
}