/
query.go
204 lines (168 loc) · 4.94 KB
/
query.go
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package memdb
import (
"context"
"fmt"
"runtime"
"time"
v0 "github.com/authzed/authzed-go/proto/authzed/api/v0"
v1 "github.com/authzed/authzed-go/proto/authzed/api/v1"
"github.com/hashicorp/go-memdb"
"github.com/jzelinskie/stringz"
"github.com/authzed/spicedb/internal/datastore"
)
type memdbTupleQuery struct {
db *memdb.MemDB
revision datastore.Revision
resourceFilter *v1.RelationshipFilter
optionalSubjectFilter *v1.SubjectFilter
subjectsFilter []*v0.ObjectAndRelation
limit *uint64
simulatedLatency time.Duration
}
func (mtq memdbTupleQuery) Limit(limit uint64) datastore.CommonTupleQuery {
mtq.limit = &limit
return mtq
}
func (mtq memdbTupleQuery) WithSubjectFilter(filter *v1.SubjectFilter) datastore.TupleQuery {
if filter == nil {
panic("cannot call WithSubjectFilter with a nil filter")
}
if mtq.optionalSubjectFilter != nil {
panic("cannot call WithSubjectFilter after WithUsersets")
}
if mtq.subjectsFilter != nil {
panic("called WithSubjectFilter twice")
}
mtq.optionalSubjectFilter = filter
return mtq
}
func (mtq memdbTupleQuery) WithUsersets(subjects []*v0.ObjectAndRelation) datastore.TupleQuery {
if mtq.optionalSubjectFilter != nil {
panic("cannot call WithUsersets after WithSubjectFilter")
}
if mtq.subjectsFilter != nil {
panic("called WithUsersets twice")
}
if len(subjects) == 0 {
panic("Given nil or empty subjects")
}
mtq.subjectsFilter = subjects
return mtq
}
func iteratorForFilter(txn *memdb.Txn, filter *v1.RelationshipFilter) (memdb.ResultIterator, error) {
switch {
case filter.OptionalResourceId != "":
return txn.Get(
tableRelationship,
indexNamespaceAndResourceID,
filter.ResourceType,
filter.OptionalResourceId,
)
case filter.OptionalSubjectFilter != nil && filter.OptionalSubjectFilter.OptionalSubjectId != "":
return txn.Get(
tableRelationship,
indexNamespaceAndSubjectID,
filter.ResourceType,
filter.OptionalSubjectFilter.SubjectType,
filter.OptionalSubjectFilter.OptionalSubjectId,
)
case filter.OptionalRelation != "":
return txn.Get(
tableRelationship,
indexNamespaceAndRelation,
filter.ResourceType,
filter.OptionalRelation,
)
}
return txn.Get(tableRelationship, indexNamespace, filter.ResourceType)
}
func (mtq memdbTupleQuery) Execute(ctx context.Context) (datastore.TupleIterator, error) {
db := mtq.db
if db == nil {
return nil, fmt.Errorf("memdb closed")
}
txn := db.Txn(false)
time.Sleep(mtq.simulatedLatency)
relationshipFilter := &v1.RelationshipFilter{
ResourceType: mtq.resourceFilter.ResourceType,
OptionalResourceId: mtq.resourceFilter.OptionalResourceId,
OptionalRelation: mtq.resourceFilter.OptionalRelation,
OptionalSubjectFilter: mtq.optionalSubjectFilter,
}
bestIterator, err := iteratorForFilter(txn, relationshipFilter)
if err != nil {
txn.Abort()
return nil, fmt.Errorf(errUnableToQueryTuples, err)
}
filteredIterator := memdb.NewFilterIterator(bestIterator, func(tupleRaw interface{}) bool {
tuple := tupleRaw.(*relationship)
filter := relationshipFilter
switch {
case filter.OptionalResourceId != "" && filter.OptionalResourceId != tuple.resourceID:
return true
case filter.OptionalRelation != "" && filter.OptionalRelation != tuple.relation:
return true
}
if subjectFilter := filter.OptionalSubjectFilter; subjectFilter != nil {
switch {
case subjectFilter.SubjectType != tuple.subjectNamespace:
return true
case subjectFilter.OptionalSubjectId != "" && subjectFilter.OptionalSubjectId != tuple.subjectObjectID:
return true
case subjectFilter.OptionalRelation != nil && stringz.DefaultEmpty(subjectFilter.OptionalRelation.Relation, datastore.Ellipsis) != tuple.subjectRelation:
return true
}
}
if len(mtq.subjectsFilter) > 0 {
found := false
for _, filter := range mtq.subjectsFilter {
if filter.Namespace == tuple.subjectNamespace &&
filter.ObjectId == tuple.subjectObjectID &&
filter.Relation == tuple.subjectRelation {
found = true
break
}
}
return !found
}
if uint64(mtq.revision.IntPart()) < tuple.createdTxn || uint64(mtq.revision.IntPart()) >= tuple.deletedTxn {
return true
}
return false
})
iter := &memdbTupleIterator{
txn: txn,
it: filteredIterator,
limit: mtq.limit,
}
runtime.SetFinalizer(iter, func(iter *memdbTupleIterator) {
if iter.txn != nil {
panic("Tuple iterator garbage collected before Close() was called")
}
})
return iter, nil
}
type memdbTupleIterator struct {
txn *memdb.Txn
it memdb.ResultIterator
limit *uint64
count uint64
}
func (mti *memdbTupleIterator) Next() *v0.RelationTuple {
foundRaw := mti.it.Next()
if foundRaw == nil {
return nil
}
if mti.limit != nil && mti.count >= *mti.limit {
return nil
}
mti.count++
return foundRaw.(*relationship).RelationTuple()
}
func (mti *memdbTupleIterator) Err() error {
return nil
}
func (mti *memdbTupleIterator) Close() {
mti.txn.Abort()
mti.txn = nil
}