/
namespace.go
230 lines (197 loc) · 6.89 KB
/
namespace.go
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package v0
import (
"context"
"errors"
"fmt"
"time"
v0 "github.com/authzed/authzed-go/proto/authzed/api/v0"
"github.com/authzed/grpcutil"
grpcmw "github.com/grpc-ecosystem/go-grpc-middleware"
"github.com/rs/zerolog/log"
"github.com/shopspring/decimal"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/authzed/spicedb/internal/datastore"
"github.com/authzed/spicedb/internal/namespace"
"github.com/authzed/spicedb/internal/services/serviceerrors"
"github.com/authzed/spicedb/internal/services/shared"
"github.com/authzed/spicedb/pkg/zookie"
)
type nsServer struct {
v0.UnimplementedNamespaceServiceServer
shared.WithUnaryServiceSpecificInterceptor
ds datastore.Datastore
}
// NewNamespaceServer creates an instance of the namespace server.
func NewNamespaceServer(ds datastore.Datastore) v0.NamespaceServiceServer {
s := &nsServer{
ds: ds,
WithUnaryServiceSpecificInterceptor: shared.WithUnaryServiceSpecificInterceptor{
Unary: grpcmw.ChainUnaryServer(grpcutil.DefaultUnaryMiddleware...),
},
}
return s
}
func (nss *nsServer) WriteConfig(ctx context.Context, req *v0.WriteConfigRequest) (*v0.WriteConfigResponse, error) {
nsm, err := namespace.NewCachingNamespaceManager(nss.ds, 0*time.Second, nil)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
readRevision, err := nss.ds.SyncRevision(ctx)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
for _, config := range req.Configs {
// Validate the type system for the updated namespace.
ts, terr := namespace.BuildNamespaceTypeSystemWithFallback(config, nsm, req.Configs, readRevision)
if terr != nil {
return nil, rewriteNamespaceError(ctx, terr)
}
tverr := ts.Validate(ctx)
if tverr != nil {
return nil, rewriteNamespaceError(ctx, tverr)
}
// Ensure that the updated namespace does not break the existing tuple data.
//
// NOTE: We use the datastore here to read the namespace, rather than the namespace manager,
// to ensure there is no caching being used.
existing, _, err := nss.ds.ReadNamespace(ctx, config.Name, readRevision)
if err != nil && !errors.As(err, &datastore.ErrNamespaceNotFound{}) {
return nil, rewriteNamespaceError(ctx, err)
}
diff, err := namespace.DiffNamespaces(existing, config)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
syncRevision, err := nss.ds.SyncRevision(ctx)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
for _, delta := range diff.Deltas() {
switch delta.Type {
case namespace.RemovedRelation:
err = errorIfTupleIteratorReturnsTuples(
ctx,
nss.ds.QueryTuples(datastore.TupleQueryResourceFilter{
ResourceType: config.Name,
OptionalResourceRelation: delta.RelationName,
}, syncRevision),
"cannot delete relation `%s` in definition `%s`, as a relationship exists under it", delta.RelationName, config.Name)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
// Also check for right sides of tuples.
err = errorIfTupleIteratorReturnsTuples(
ctx,
nss.ds.ReverseQueryTuplesFromSubjectRelation(config.Name, delta.RelationName, syncRevision),
"cannot delete relation `%s` in definition `%s`, as a relationship references it", delta.RelationName, config.Name)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
case namespace.RelationDirectTypeRemoved:
err = errorIfTupleIteratorReturnsTuples(
ctx,
nss.ds.ReverseQueryTuplesFromSubjectRelation(delta.DirectType.Namespace, delta.DirectType.Relation, syncRevision).
WithObjectRelation(config.Name, delta.RelationName),
"cannot remove allowed relation/permission `%s#%s` from relation `%s` in definition `%s`, as a relationship exists with it",
delta.DirectType.Namespace, delta.DirectType.Relation, delta.RelationName, config.Name)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
}
}
}
revision := decimal.Zero
for _, config := range req.Configs {
var err error
revision, err = nss.ds.WriteNamespace(ctx, config)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
}
return &v0.WriteConfigResponse{
Revision: zookie.NewFromRevision(revision),
}, nil
}
func (nss *nsServer) ReadConfig(ctx context.Context, req *v0.ReadConfigRequest) (*v0.ReadConfigResponse, error) {
readRevision, err := nss.ds.SyncRevision(ctx)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
found, _, err := nss.ds.ReadNamespace(ctx, req.Namespace, readRevision)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
return &v0.ReadConfigResponse{
Namespace: req.Namespace,
Config: found,
Revision: zookie.NewFromRevision(readRevision),
}, nil
}
func (nss *nsServer) DeleteConfigs(ctx context.Context, req *v0.DeleteConfigsRequest) (*v0.DeleteConfigsResponse, error) {
syncRevision, err := nss.ds.SyncRevision(ctx)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
// Ensure that all the specified namespaces can be deleted.
for _, nsName := range req.Namespaces {
// Ensure the namespace exists.
_, _, err := nss.ds.ReadNamespace(ctx, nsName, syncRevision)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
// Check for relationships under the namespace.
err = errorIfTupleIteratorReturnsTuples(
ctx,
nss.ds.QueryTuples(datastore.TupleQueryResourceFilter{
ResourceType: nsName,
}, syncRevision),
"cannot delete definition `%s`, as a relationship exists under it", nsName)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
// Also check for right sides of relationships.
err = errorIfTupleIteratorReturnsTuples(
ctx,
nss.ds.ReverseQueryTuplesFromSubjectNamespace(nsName, syncRevision),
"cannot delete definition `%s`, as a relationship references it", nsName)
if err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
}
// Delete all the namespaces specified.
for _, nsName := range req.Namespaces {
if _, err := nss.ds.DeleteNamespace(ctx, nsName); err != nil {
return nil, rewriteNamespaceError(ctx, err)
}
}
return &v0.DeleteConfigsResponse{
Revision: zookie.NewFromRevision(syncRevision),
}, nil
}
func errorIfTupleIteratorReturnsTuples(ctx context.Context, query datastore.CommonTupleQuery, message string, args ...interface{}) error {
qy, err := query.Limit(1).Execute(ctx)
if err != nil {
return err
}
defer qy.Close()
rt := qy.Next()
if rt != nil {
if qy.Err() != nil {
return qy.Err()
}
return status.Errorf(codes.InvalidArgument, fmt.Sprintf(message, args...))
}
return nil
}
func rewriteNamespaceError(ctx context.Context, err error) error {
switch {
case errors.As(err, &datastore.ErrNamespaceNotFound{}):
return status.Errorf(codes.NotFound, "object definition not found: %s", err)
case errors.As(err, &datastore.ErrReadOnly{}):
return serviceerrors.ErrServiceReadOnly
default:
log.Ctx(ctx).Err(err)
return err
}
}