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caveat.go
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caveat.go
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package crdb
import (
"context"
"errors"
"fmt"
"time"
sq "github.com/Masterminds/squirrel"
"github.com/jackc/pgx/v4"
"github.com/authzed/spicedb/pkg/datastore"
core "github.com/authzed/spicedb/pkg/proto/core/v1"
)
var (
upsertCaveatSuffix = fmt.Sprintf(
"ON CONFLICT (%s) DO UPDATE SET %s = excluded.%s",
colCaveatName,
colCaveatDefinition,
colCaveatDefinition,
)
writeCaveat = psql.Insert(tableCaveat).Columns(colCaveatName, colCaveatDefinition).Suffix(upsertCaveatSuffix)
readCaveat = psql.Select(colCaveatDefinition, colTimestamp).From(tableCaveat)
listCaveat = psql.Select(colCaveatName, colCaveatDefinition).From(tableCaveat).OrderBy(colCaveatName)
deleteCaveat = psql.Delete(tableCaveat)
)
const (
errWriteCaveat = "unable to write new caveat revision: %w"
errReadCaveat = "unable to read new caveat `%s`: %w"
errListCaveats = "unable to list caveat: %w"
errDeleteCaveats = "unable to delete caveats: %w"
)
func (cr *crdbReader) ReadCaveatByName(ctx context.Context, name string) (*core.CaveatDefinition, datastore.Revision, error) {
query := readCaveat.Where(sq.Eq{colCaveatName: name})
sql, args, err := query.ToSql()
if err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, name, err)
}
var definitionBytes []byte
var timestamp time.Time
err = cr.executeWithTx(ctx, func(ctx context.Context, tx pgx.Tx) error {
if err := tx.QueryRow(ctx, sql, args...).Scan(&definitionBytes, ×tamp); err != nil {
if errors.Is(err, pgx.ErrNoRows) {
err = datastore.NewCaveatNameNotFoundErr(name)
}
return err
}
return nil
})
if err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, name, err)
}
loaded := &core.CaveatDefinition{}
if err := loaded.UnmarshalVT(definitionBytes); err != nil {
return nil, datastore.NoRevision, fmt.Errorf(errReadCaveat, name, err)
}
cr.addOverlapKey(name)
return loaded, revisionFromTimestamp(timestamp), nil
}
func (cr *crdbReader) ListCaveats(ctx context.Context, caveatNames ...string) ([]*core.CaveatDefinition, error) {
caveatsWithNames := listCaveat
if len(caveatNames) > 0 {
caveatsWithNames = caveatsWithNames.Where(sq.Eq{colCaveatName: caveatNames})
}
sql, args, err := caveatsWithNames.ToSql()
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
var allDefinitionBytes [][]byte
err = cr.executeWithTx(ctx, func(ctx context.Context, tx pgx.Tx) error {
rows, err := tx.Query(ctx, sql, args...)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var defBytes []byte
var name string
err = rows.Scan(&name, &defBytes)
if err != nil {
return err
}
allDefinitionBytes = append(allDefinitionBytes, defBytes)
cr.addOverlapKey(name)
}
return nil
})
if err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
caveats := make([]*core.CaveatDefinition, 0, len(allDefinitionBytes))
for _, defBytes := range allDefinitionBytes {
loaded := &core.CaveatDefinition{}
if err := loaded.UnmarshalVT(defBytes); err != nil {
return nil, fmt.Errorf(errListCaveats, err)
}
caveats = append(caveats, loaded)
}
return caveats, nil
}
func (rwt *crdbReadWriteTXN) 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(errWriteCaveat, err)
}
valuesToWrite := []any{caveat.Name, definitionBytes}
write = write.Values(valuesToWrite...)
writtenCaveatNames = append(writtenCaveatNames, caveat.Name)
}
// store the new caveat
sql, args, err := write.ToSql()
if err != nil {
return fmt.Errorf(errWriteCaveat, err)
}
for _, val := range writtenCaveatNames {
rwt.addOverlapKey(val)
}
return rwt.executeWithTx(ctx, func(ctx context.Context, tx pgx.Tx) error {
if _, err := rwt.tx.Exec(ctx, sql, args...); err != nil {
return fmt.Errorf(errWriteCaveat, err)
}
return nil
})
}
func (rwt *crdbReadWriteTXN) DeleteCaveats(ctx context.Context, names []string) error {
deleteCaveatClause := deleteCaveat.Where(sq.Eq{colCaveatName: names})
sql, args, err := deleteCaveatClause.ToSql()
if err != nil {
return fmt.Errorf(errDeleteCaveats, err)
}
for _, val := range names {
rwt.addOverlapKey(val)
}
return rwt.executeWithTx(ctx, func(ctx context.Context, tx pgx.Tx) error {
if _, err := tx.Exec(ctx, sql, args...); err != nil {
return fmt.Errorf(errDeleteCaveats, err)
}
return nil
})
}
func (cr *crdbReader) executeWithTx(ctx context.Context, f func(ctx context.Context, tx pgx.Tx) error) error {
return cr.execute(ctx, func(ctx context.Context) error {
tx, txCleanup, err := cr.txSource(ctx)
if err != nil {
return err
}
defer txCleanup(ctx)
return f(ctx, tx)
})
}