/
reader.go
204 lines (169 loc) · 5.47 KB
/
reader.go
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package postgres
import (
"context"
"errors"
"fmt"
sq "github.com/Masterminds/squirrel"
"github.com/jackc/pgx/v5"
"github.com/authzed/spicedb/internal/datastore/common"
pgxcommon "github.com/authzed/spicedb/internal/datastore/postgres/common"
"github.com/authzed/spicedb/pkg/datastore"
"github.com/authzed/spicedb/pkg/datastore/options"
core "github.com/authzed/spicedb/pkg/proto/core/v1"
)
type pgReader struct {
query pgxcommon.DBFuncQuerier
executor common.QueryExecutor
filterer queryFilterer
}
type queryFilterer func(original sq.SelectBuilder) sq.SelectBuilder
var (
queryTuples = psql.Select(
colNamespace,
colObjectID,
colRelation,
colUsersetNamespace,
colUsersetObjectID,
colUsersetRelation,
colCaveatContextName,
colCaveatContext,
).From(tableTuple)
schema = common.NewSchemaInformation(
colNamespace,
colObjectID,
colRelation,
colUsersetNamespace,
colUsersetObjectID,
colUsersetRelation,
colCaveatContextName,
common.TupleComparison,
)
readNamespace = psql.
Select(colConfig, colCreatedXid).
From(tableNamespace)
)
const (
errUnableToReadConfig = "unable to read namespace config: %w"
errUnableToListNamespaces = "unable to list namespaces: %w"
)
func (r *pgReader) QueryRelationships(
ctx context.Context,
filter datastore.RelationshipsFilter,
opts ...options.QueryOptionsOption,
) (iter datastore.RelationshipIterator, err error) {
qBuilder, err := common.NewSchemaQueryFilterer(schema, r.filterer(queryTuples)).FilterWithRelationshipsFilter(filter)
if err != nil {
return nil, err
}
return r.executor.ExecuteQuery(ctx, qBuilder, opts...)
}
func (r *pgReader) ReverseQueryRelationships(
ctx context.Context,
subjectsFilter datastore.SubjectsFilter,
opts ...options.ReverseQueryOptionsOption,
) (iter datastore.RelationshipIterator, err error) {
qBuilder, err := common.NewSchemaQueryFilterer(schema, r.filterer(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 r.executor.ExecuteQuery(ctx,
qBuilder,
options.WithLimit(queryOpts.LimitForReverse),
options.WithAfter(queryOpts.AfterForReverse),
options.WithSort(queryOpts.SortForReverse),
)
}
func (r *pgReader) ReadNamespaceByName(ctx context.Context, nsName string) (*core.NamespaceDefinition, datastore.Revision, error) {
loaded, version, err := r.loadNamespace(ctx, nsName, r.query, r.filterer)
switch {
case errors.As(err, &datastore.ErrNamespaceNotFound{}):
return nil, datastore.NoRevision, err
case err == nil:
return loaded, version, nil
default:
return nil, datastore.NoRevision, fmt.Errorf(errUnableToReadConfig, err)
}
}
func (r *pgReader) loadNamespace(ctx context.Context, namespace string, tx pgxcommon.DBFuncQuerier, filterer queryFilterer) (*core.NamespaceDefinition, postgresRevision, error) {
ctx, span := tracer.Start(ctx, "loadNamespace")
defer span.End()
defs, err := loadAllNamespaces(ctx, tx, func(original sq.SelectBuilder) sq.SelectBuilder {
return filterer(original).Where(sq.Eq{colNamespace: namespace})
})
if err != nil {
return nil, postgresRevision{}, err
}
if len(defs) < 1 {
return nil, postgresRevision{}, datastore.NewNamespaceNotFoundErr(namespace)
}
return defs[0].Definition, defs[0].LastWrittenRevision.(postgresRevision), nil
}
func (r *pgReader) ListAllNamespaces(ctx context.Context) ([]datastore.RevisionedNamespace, error) {
nsDefsWithRevisions, err := loadAllNamespaces(ctx, r.query, r.filterer)
if err != nil {
return nil, fmt.Errorf(errUnableToListNamespaces, err)
}
return nsDefsWithRevisions, err
}
func (r *pgReader) LookupNamespacesWithNames(ctx context.Context, nsNames []string) ([]datastore.RevisionedNamespace, error) {
if len(nsNames) == 0 {
return nil, nil
}
clause := sq.Or{}
for _, nsName := range nsNames {
clause = append(clause, sq.Eq{colNamespace: nsName})
}
nsDefsWithRevisions, err := loadAllNamespaces(ctx, r.query, func(original sq.SelectBuilder) sq.SelectBuilder {
return r.filterer(original).Where(clause)
})
if err != nil {
return nil, fmt.Errorf(errUnableToListNamespaces, err)
}
return nsDefsWithRevisions, err
}
func loadAllNamespaces(
ctx context.Context,
tx pgxcommon.DBFuncQuerier,
filterer queryFilterer,
) ([]datastore.RevisionedNamespace, error) {
sql, args, err := filterer(readNamespace).ToSql()
if err != nil {
return nil, err
}
var nsDefs []datastore.RevisionedNamespace
err = tx.QueryFunc(ctx, func(ctx context.Context, rows pgx.Rows) error {
for rows.Next() {
var config []byte
var version xid8
if err := rows.Scan(&config, &version); err != nil {
return err
}
loaded := &core.NamespaceDefinition{}
if err := loaded.UnmarshalVT(config); err != nil {
return fmt.Errorf(errUnableToReadConfig, err)
}
revision := revisionForVersion(version)
nsDefs = append(nsDefs, datastore.RevisionedNamespace{Definition: loaded, LastWrittenRevision: revision})
}
return rows.Err()
}, sql, args...)
if err != nil {
return nil, err
}
return nsDefs, nil
}
// revisionForVersion synthesizes a snapshot where the specified version is always visible.
func revisionForVersion(version xid8) postgresRevision {
return postgresRevision{pgSnapshot{
xmin: version.Uint64 + 1,
xmax: version.Uint64 + 1,
}}
}
var _ datastore.Reader = &pgReader{}