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caveat.go
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caveat.go
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package memdb
import (
"context"
"fmt"
"github.com/hashicorp/go-memdb"
"github.com/authzed/spicedb/pkg/datastore"
core "github.com/authzed/spicedb/pkg/proto/core/v1"
"github.com/authzed/spicedb/pkg/util"
)
const tableCaveats = "caveats"
type caveat struct {
name string
definition []byte
revision datastore.Revision
}
func (c *caveat) Unwrap() (*core.CaveatDefinition, error) {
definition := core.CaveatDefinition{}
err := definition.UnmarshalVT(c.definition)
return &definition, err
}
func (r *memdbReader) ReadCaveatByName(_ context.Context, name string) (*core.CaveatDefinition, datastore.Revision, error) {
r.mustLock()
defer r.Unlock()
tx, err := r.txSource()
if err != nil {
return nil, datastore.NoRevision, err
}
return r.readUnwrappedCaveatByName(tx, name)
}
func (r *memdbReader) readCaveatByName(tx *memdb.Txn, name string) (*caveat, datastore.Revision, error) {
found, err := tx.First(tableCaveats, indexID, name)
if err != nil {
return nil, datastore.NoRevision, err
}
if found == nil {
return nil, datastore.NoRevision, datastore.NewCaveatNameNotFoundErr(name)
}
cvt := found.(*caveat)
return cvt, cvt.revision, nil
}
func (r *memdbReader) readUnwrappedCaveatByName(tx *memdb.Txn, name string) (*core.CaveatDefinition, datastore.Revision, error) {
c, rev, err := r.readCaveatByName(tx, name)
if err != nil {
return nil, datastore.NoRevision, err
}
unwrapped, err := c.Unwrap()
if err != nil {
return nil, datastore.NoRevision, err
}
return unwrapped, rev, nil
}
func (r *memdbReader) ListAllCaveats(_ context.Context) ([]datastore.RevisionedCaveat, error) {
r.mustLock()
defer r.Unlock()
tx, err := r.txSource()
if err != nil {
return nil, err
}
var caveats []datastore.RevisionedCaveat
it, err := tx.LowerBound(tableCaveats, indexID)
if err != nil {
return nil, err
}
for foundRaw := it.Next(); foundRaw != nil; foundRaw = it.Next() {
rawCaveat := foundRaw.(*caveat)
definition, err := rawCaveat.Unwrap()
if err != nil {
return nil, err
}
caveats = append(caveats, datastore.RevisionedCaveat{
Definition: definition,
LastWrittenRevision: rawCaveat.revision,
})
}
return caveats, nil
}
func (r *memdbReader) LookupCaveatsWithNames(ctx context.Context, caveatNames []string) ([]datastore.RevisionedCaveat, error) {
allCaveats, err := r.ListAllCaveats(ctx)
if err != nil {
return nil, err
}
allowedCaveatNames := util.NewSet[string]()
allowedCaveatNames.Extend(caveatNames)
toReturn := make([]datastore.RevisionedCaveat, 0, len(caveatNames))
for _, caveat := range allCaveats {
if allowedCaveatNames.Has(caveat.Definition.Name) {
toReturn = append(toReturn, caveat)
}
}
return toReturn, nil
}
func (rwt *memdbReadWriteTx) WriteCaveats(ctx context.Context, caveats []*core.CaveatDefinition) error {
rwt.mustLock()
defer rwt.Unlock()
tx, err := rwt.txSource()
if err != nil {
return err
}
return rwt.writeCaveat(tx, caveats)
}
func (rwt *memdbReadWriteTx) writeCaveat(tx *memdb.Txn, caveats []*core.CaveatDefinition) error {
caveatNames := util.NewSet[string]()
for _, coreCaveat := range caveats {
if !caveatNames.Add(coreCaveat.Name) {
return fmt.Errorf("duplicate caveat %s", coreCaveat.Name)
}
marshalled, err := coreCaveat.MarshalVT()
if err != nil {
return err
}
c := caveat{
name: coreCaveat.Name,
definition: marshalled,
revision: rwt.newRevision,
}
if err := tx.Insert(tableCaveats, &c); err != nil {
return err
}
}
return nil
}
func (rwt *memdbReadWriteTx) DeleteCaveats(ctx context.Context, names []string) error {
rwt.mustLock()
defer rwt.Unlock()
tx, err := rwt.txSource()
if err != nil {
return err
}
for _, name := range names {
if err := tx.Delete(tableCaveats, caveat{name: name}); err != nil {
return err
}
}
return nil
}