diff options
Diffstat (limited to 'vendor/google.golang.org/appengine/datastore/metadata.go')
-rw-r--r-- | vendor/google.golang.org/appengine/datastore/metadata.go | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/vendor/google.golang.org/appengine/datastore/metadata.go b/vendor/google.golang.org/appengine/datastore/metadata.go new file mode 100644 index 000000000..6acacc3db --- /dev/null +++ b/vendor/google.golang.org/appengine/datastore/metadata.go @@ -0,0 +1,78 @@ +// Copyright 2016 Google Inc. All rights reserved. +// Use of this source code is governed by the Apache 2.0 +// license that can be found in the LICENSE file. + +package datastore + +import "golang.org/x/net/context" + +// Datastore kinds for the metadata entities. +const ( + namespaceKind = "__namespace__" + kindKind = "__kind__" + propertyKind = "__property__" +) + +// Namespaces returns all the datastore namespaces. +func Namespaces(ctx context.Context) ([]string, error) { + // TODO(djd): Support range queries. + q := NewQuery(namespaceKind).KeysOnly() + keys, err := q.GetAll(ctx, nil) + if err != nil { + return nil, err + } + // The empty namespace key uses a numeric ID (==1), but luckily + // the string ID defaults to "" for numeric IDs anyway. + return keyNames(keys), nil +} + +// Kinds returns the names of all the kinds in the current namespace. +func Kinds(ctx context.Context) ([]string, error) { + // TODO(djd): Support range queries. + q := NewQuery(kindKind).KeysOnly() + keys, err := q.GetAll(ctx, nil) + if err != nil { + return nil, err + } + return keyNames(keys), nil +} + +// keyNames returns a slice of the provided keys' names (string IDs). +func keyNames(keys []*Key) []string { + n := make([]string, 0, len(keys)) + for _, k := range keys { + n = append(n, k.StringID()) + } + return n +} + +// KindProperties returns all the indexed properties for the given kind. +// The properties are returned as a map of property names to a slice of the +// representation types. The representation types for the supported Go property +// types are: +// "INT64": signed integers and time.Time +// "DOUBLE": float32 and float64 +// "BOOLEAN": bool +// "STRING": string, []byte and ByteString +// "POINT": appengine.GeoPoint +// "REFERENCE": *Key +// "USER": (not used in the Go runtime) +func KindProperties(ctx context.Context, kind string) (map[string][]string, error) { + // TODO(djd): Support range queries. + kindKey := NewKey(ctx, kindKind, kind, 0, nil) + q := NewQuery(propertyKind).Ancestor(kindKey) + + propMap := map[string][]string{} + props := []struct { + Repr []string `datastore:"property_representation"` + }{} + + keys, err := q.GetAll(ctx, &props) + if err != nil { + return nil, err + } + for i, p := range props { + propMap[keys[i].StringID()] = p.Repr + } + return propMap, nil +} |