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caveat.go
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caveat.go
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package postgres
import (
"context"
"errors"
"fmt"
"github.com/jackc/pgx/v5"
"github.com/authzed/spicedb/pkg/datastore"
core "github.com/authzed/spicedb/pkg/proto/core/v1"
sq "github.com/Masterminds/squirrel"
)
var (
writeCaveat = psql.Insert(tableCaveat).Columns(colCaveatName, colCaveatDefinition)
listCaveat = psql.
Select(colCaveatDefinition, colCreatedXid).
From(tableCaveat).
OrderBy(colCaveatName)
readCaveat = psql.
Select(colCaveatDefinition, colCreatedXid).
From(tableCaveat)
deleteCaveat = psql.Update(tableCaveat).Where(sq.Eq{colDeletedXid: liveDeletedTxnID})
)
const (
errWriteCaveats = "unable to write caveats: %w"
errDeleteCaveats = "unable delete caveats: %w"
errListCaveats = "unable to list caveats: %w"
errReadCaveat = "unable to read caveat: %w"
)
func (r *pgReader) ReadCaveatByName(ctx context.Context, name string) (*core.CaveatDefinition, datastore.Revision, error) {
filteredReadCaveat := r.filterer(readCaveat)
sql, args, err := filteredReadCaveat.Where(sq.Eq{colCaveatName: name}).ToSql()
if err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, err)
}
tx, txCleanup, err := r.txSource(ctx)
if err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, err)
}
defer txCleanup(ctx)
var txID xid8
var serializedDef []byte
err = tx.QueryRow(ctx, sql, args...).Scan(&serializedDef, &txID)
if err != nil {
if errors.Is(err, pgx.ErrNoRows) {
return nil, datastore.NoRevision, datastore.NewCaveatNameNotFoundErr(name)
}
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, err)
}
def := core.CaveatDefinition{}
err = def.UnmarshalVT(serializedDef)
if err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, err)
}
rev := revisionForVersion(txID)
return &def, rev, nil
}
func (r *pgReader) LookupCaveatsWithNames(ctx context.Context, caveatNames []string) ([]datastore.RevisionedCaveat, error) {
if len(caveatNames) == 0 {
return nil, nil
}
return r.lookupCaveats(ctx, caveatNames)
}
func (r *pgReader) ListAllCaveats(ctx context.Context) ([]datastore.RevisionedCaveat, error) {
return r.lookupCaveats(ctx, nil)
}
func (r *pgReader) lookupCaveats(ctx context.Context, caveatNames []string) ([]datastore.RevisionedCaveat, error) {
caveatsWithNames := listCaveat
if len(caveatNames) > 0 {
caveatsWithNames = caveatsWithNames.Where(sq.Eq{colCaveatName: caveatNames})
}
filteredListCaveat := r.filterer(caveatsWithNames)
sql, args, err := filteredListCaveat.ToSql()
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
tx, txCleanup, err := r.txSource(ctx)
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
defer txCleanup(ctx)
rows, err := tx.Query(ctx, sql, args...)
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
defer rows.Close()
var caveats []datastore.RevisionedCaveat
for rows.Next() {
var version xid8
var defBytes []byte
err = rows.Scan(&defBytes, &version)
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
c := core.CaveatDefinition{}
err = c.UnmarshalVT(defBytes)
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
revision := revisionForVersion(version)
caveats = append(caveats, datastore.RevisionedCaveat{Definition: &c, LastWrittenRevision: revision})
}
if rows.Err() != nil {
return nil, fmt.Errorf(errListCaveats, rows.Err())
}
return caveats, nil
}
func (rwt *pgReadWriteTXN) WriteCaveats(ctx context.Context, caveats []*core.CaveatDefinition) error {
if len(caveats) == 0 {
return nil
}
write := writeCaveat
writtenCaveatNames := make([]string, 0, len(caveats))
for _, caveat := range caveats {
definitionBytes, err := caveat.MarshalVT()
if err != nil {
return fmt.Errorf(errWriteCaveats, err)
}
valuesToWrite := []any{caveat.Name, definitionBytes}
write = write.Values(valuesToWrite...)
writtenCaveatNames = append(writtenCaveatNames, caveat.Name)
}
// mark current caveats as deleted
err := rwt.deleteCaveatsFromNames(ctx, writtenCaveatNames)
if err != nil {
return fmt.Errorf(errWriteCaveats, err)
}
// store the new caveat revision
sql, args, err := write.ToSql()
if err != nil {
return fmt.Errorf(errWriteCaveats, err)
}
if _, err := rwt.tx.Exec(ctx, sql, args...); err != nil {
return fmt.Errorf(errWriteCaveats, err)
}
return nil
}
func (rwt *pgReadWriteTXN) DeleteCaveats(ctx context.Context, names []string) error {
// mark current caveats as deleted
return rwt.deleteCaveatsFromNames(ctx, names)
}
func (rwt *pgReadWriteTXN) deleteCaveatsFromNames(ctx context.Context, names []string) error {
sql, args, err := deleteCaveat.
Set(colDeletedXid, rwt.newXID).
Where(sq.Eq{colCaveatName: names}).
ToSql()
if err != nil {
return fmt.Errorf(errDeleteCaveats, err)
}
if _, err := rwt.tx.Exec(ctx, sql, args...); err != nil {
return fmt.Errorf(errDeleteCaveats, err)
}
return nil
}