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reader.go
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reader.go
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package spanner
import (
"context"
"fmt"
"time"
"cloud.google.com/go/spanner"
"google.golang.org/grpc/codes"
"github.com/authzed/spicedb/internal/datastore/common"
"github.com/authzed/spicedb/internal/datastore/options"
"github.com/authzed/spicedb/pkg/datastore"
core "github.com/authzed/spicedb/pkg/proto/core/v1"
)
// The underlying Spanner shared read transaction interface is not exposed, so we re-create
// the subsection of it which we need here.
// https://github.com/googleapis/google-cloud-go/blob/a33861fe46be42ae150d6015ad39dae6e35e04e8/spanner/transaction.go#L55
type readTX interface {
ReadRow(ctx context.Context, table string, key spanner.Key, columns []string) (*spanner.Row, error)
Read(ctx context.Context, table string, keys spanner.KeySet, columns []string) *spanner.RowIterator
Query(ctx context.Context, statement spanner.Statement) *spanner.RowIterator
}
type txFactory func() readTX
type spannerReader struct {
querySplitter common.TupleQuerySplitter
txSource txFactory
}
func (sr spannerReader) QueryRelationships(
ctx context.Context,
filter datastore.RelationshipsFilter,
opts ...options.QueryOptionsOption,
) (iter datastore.RelationshipIterator, err error) {
qBuilder, err := common.NewSchemaQueryFilterer(schema, queryTuples).FilterWithRelationshipsFilter(filter)
if err != nil {
return nil, err
}
return sr.querySplitter.SplitAndExecuteQuery(ctx, qBuilder, opts...)
}
func (sr spannerReader) ReverseQueryRelationships(
ctx context.Context,
subjectsFilter datastore.SubjectsFilter,
opts ...options.ReverseQueryOptionsOption,
) (iter datastore.RelationshipIterator, err error) {
qBuilder, err := common.NewSchemaQueryFilterer(schema, queryTuples).
FilterWithSubjectsSelectors(subjectsFilter.AsSelector())
if err != nil {
return nil, err
}
queryOpts := options.NewReverseQueryOptionsWithOptions(opts...)
if queryOpts.ResRelation != nil {
qBuilder = qBuilder.
FilterToResourceType(queryOpts.ResRelation.Namespace).
FilterToRelation(queryOpts.ResRelation.Relation)
}
return sr.querySplitter.SplitAndExecuteQuery(ctx,
qBuilder,
options.WithLimit(queryOpts.ReverseLimit),
)
}
func queryExecutor(txSource txFactory) common.ExecuteQueryFunc {
return func(
ctx context.Context,
sql string,
args []interface{},
) ([]*core.RelationTuple, error) {
ctx, span := tracer.Start(ctx, "ExecuteQuery")
defer span.End()
iter := txSource().Query(ctx, statementFromSQL(sql, args))
var tuples []*core.RelationTuple
if err := iter.Do(func(row *spanner.Row) error {
nextTuple := &core.RelationTuple{
ResourceAndRelation: &core.ObjectAndRelation{},
Subject: &core.ObjectAndRelation{},
}
var caveatName spanner.NullString
var caveatCtx spanner.NullJSON
err := row.Columns(
&nextTuple.ResourceAndRelation.Namespace,
&nextTuple.ResourceAndRelation.ObjectId,
&nextTuple.ResourceAndRelation.Relation,
&nextTuple.Subject.Namespace,
&nextTuple.Subject.ObjectId,
&nextTuple.Subject.Relation,
&caveatName,
&caveatCtx,
)
if err != nil {
return err
}
nextTuple.Caveat, err = ContextualizedCaveatFrom(caveatName, caveatCtx)
if err != nil {
return err
}
tuples = append(tuples, nextTuple)
return nil
}); err != nil {
return nil, err
}
return tuples, nil
}
}
func (sr spannerReader) ReadNamespaceByName(ctx context.Context, nsName string) (*core.NamespaceDefinition, datastore.Revision, error) {
nsKey := spanner.Key{nsName}
row, err := sr.txSource().ReadRow(
ctx,
tableNamespace,
nsKey,
[]string{colNamespaceConfig, colNamespaceTS},
)
if err != nil {
if spanner.ErrCode(err) == codes.NotFound {
return nil, datastore.NoRevision, datastore.NewNamespaceNotFoundErr(nsName)
}
return nil, datastore.NoRevision, fmt.Errorf(errUnableToReadConfig, err)
}
var serialized []byte
var updated time.Time
if err := row.Columns(&serialized, &updated); err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errUnableToReadConfig, err)
}
ns := &core.NamespaceDefinition{}
if err := ns.UnmarshalVT(serialized); err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errUnableToReadConfig, err)
}
return ns, revisionFromTimestamp(updated), nil
}
func (sr spannerReader) ListAllNamespaces(ctx context.Context) ([]datastore.RevisionedNamespace, error) {
iter := sr.txSource().Read(
ctx,
tableNamespace,
spanner.AllKeys(),
[]string{colNamespaceConfig, colNamespaceTS},
)
allNamespaces, err := readAllNamespaces(iter)
if err != nil {
return nil, fmt.Errorf(errUnableToListNamespaces, err)
}
return allNamespaces, nil
}
func (sr spannerReader) LookupNamespacesWithNames(ctx context.Context, nsNames []string) ([]datastore.RevisionedNamespace, error) {
if len(nsNames) == 0 {
return nil, nil
}
keys := make([]spanner.Key, 0, len(nsNames))
for _, nsName := range nsNames {
keys = append(keys, spanner.Key{nsName})
}
iter := sr.txSource().Read(
ctx,
tableNamespace,
spanner.KeySetFromKeys(keys...),
[]string{colNamespaceConfig, colNamespaceTS},
)
foundNamespaces, err := readAllNamespaces(iter)
if err != nil {
return nil, fmt.Errorf(errUnableToListNamespaces, err)
}
return foundNamespaces, nil
}
func readAllNamespaces(iter *spanner.RowIterator) ([]datastore.RevisionedNamespace, error) {
var allNamespaces []datastore.RevisionedNamespace
if err := iter.Do(func(row *spanner.Row) error {
var serialized []byte
var updated time.Time
if err := row.Columns(&serialized, &updated); err != nil {
return err
}
ns := &core.NamespaceDefinition{}
if err := ns.UnmarshalVT(serialized); err != nil {
return err
}
allNamespaces = append(allNamespaces, datastore.RevisionedNamespace{
Definition: ns,
LastWrittenRevision: revisionFromTimestamp(updated),
})
return nil
}); err != nil {
return nil, err
}
return allNamespaces, nil
}
var queryTuples = sql.Select(
colNamespace,
colObjectID,
colRelation,
colUsersetNamespace,
colUsersetObjectID,
colUsersetRelation,
colCaveatName,
colCaveatContext,
).From(tableRelationship)
var schema = common.SchemaInformation{
ColNamespace: colNamespace,
ColObjectID: colObjectID,
ColRelation: colRelation,
ColUsersetNamespace: colUsersetNamespace,
ColUsersetObjectID: colUsersetObjectID,
ColUsersetRelation: colUsersetRelation,
ColCaveatName: colCaveatName,
}
var _ datastore.Reader = spannerReader{}