628 lines
18 KiB
Go
628 lines
18 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package datastore
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import (
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"errors"
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"fmt"
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"log"
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"os"
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"reflect"
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"cloud.google.com/go/internal/trace"
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"golang.org/x/net/context"
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"google.golang.org/api/option"
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gtransport "google.golang.org/api/transport/grpc"
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pb "google.golang.org/genproto/googleapis/datastore/v1"
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"google.golang.org/grpc"
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)
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const (
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prodAddr = "datastore.googleapis.com:443"
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userAgent = "gcloud-golang-datastore/20160401"
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)
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// ScopeDatastore grants permissions to view and/or manage datastore entities
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const ScopeDatastore = "https://www.googleapis.com/auth/datastore"
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// resourcePrefixHeader is the name of the metadata header used to indicate
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// the resource being operated on.
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const resourcePrefixHeader = "google-cloud-resource-prefix"
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// Client is a client for reading and writing data in a datastore dataset.
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type Client struct {
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conn *grpc.ClientConn
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client pb.DatastoreClient
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endpoint string
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dataset string // Called dataset by the datastore API, synonym for project ID.
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}
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// NewClient creates a new Client for a given dataset.
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// If the project ID is empty, it is derived from the DATASTORE_PROJECT_ID environment variable.
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// If the DATASTORE_EMULATOR_HOST environment variable is set, client will use its value
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// to connect to a locally-running datastore emulator.
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func NewClient(ctx context.Context, projectID string, opts ...option.ClientOption) (*Client, error) {
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var o []option.ClientOption
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// Environment variables for gcd emulator:
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// https://cloud.google.com/datastore/docs/tools/datastore-emulator
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// If the emulator is available, dial it directly (and don't pass any credentials).
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if addr := os.Getenv("DATASTORE_EMULATOR_HOST"); addr != "" {
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conn, err := grpc.Dial(addr, grpc.WithInsecure())
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if err != nil {
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return nil, fmt.Errorf("grpc.Dial: %v", err)
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}
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o = []option.ClientOption{option.WithGRPCConn(conn)}
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} else {
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o = []option.ClientOption{
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option.WithEndpoint(prodAddr),
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option.WithScopes(ScopeDatastore),
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option.WithUserAgent(userAgent),
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}
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}
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// Warn if we see the legacy emulator environment variables.
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if os.Getenv("DATASTORE_HOST") != "" && os.Getenv("DATASTORE_EMULATOR_HOST") == "" {
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log.Print("WARNING: legacy environment variable DATASTORE_HOST is ignored. Use DATASTORE_EMULATOR_HOST instead.")
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}
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if os.Getenv("DATASTORE_DATASET") != "" && os.Getenv("DATASTORE_PROJECT_ID") == "" {
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log.Print("WARNING: legacy environment variable DATASTORE_DATASET is ignored. Use DATASTORE_PROJECT_ID instead.")
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}
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if projectID == "" {
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projectID = os.Getenv("DATASTORE_PROJECT_ID")
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}
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if projectID == "" {
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return nil, errors.New("datastore: missing project/dataset id")
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}
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o = append(o, opts...)
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conn, err := gtransport.Dial(ctx, o...)
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if err != nil {
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return nil, fmt.Errorf("dialing: %v", err)
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}
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return &Client{
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conn: conn,
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client: newDatastoreClient(conn, projectID),
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dataset: projectID,
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}, nil
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}
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var (
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// ErrInvalidEntityType is returned when functions like Get or Next are
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// passed a dst or src argument of invalid type.
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ErrInvalidEntityType = errors.New("datastore: invalid entity type")
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// ErrInvalidKey is returned when an invalid key is presented.
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ErrInvalidKey = errors.New("datastore: invalid key")
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// ErrNoSuchEntity is returned when no entity was found for a given key.
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ErrNoSuchEntity = errors.New("datastore: no such entity")
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)
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type multiArgType int
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const (
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multiArgTypeInvalid multiArgType = iota
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multiArgTypePropertyLoadSaver
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multiArgTypeStruct
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multiArgTypeStructPtr
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multiArgTypeInterface
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)
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// ErrFieldMismatch is returned when a field is to be loaded into a different
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// type than the one it was stored from, or when a field is missing or
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// unexported in the destination struct.
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// StructType is the type of the struct pointed to by the destination argument
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// passed to Get or to Iterator.Next.
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type ErrFieldMismatch struct {
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StructType reflect.Type
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FieldName string
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Reason string
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}
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func (e *ErrFieldMismatch) Error() string {
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return fmt.Sprintf("datastore: cannot load field %q into a %q: %s",
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e.FieldName, e.StructType, e.Reason)
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}
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// GeoPoint represents a location as latitude/longitude in degrees.
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type GeoPoint struct {
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Lat, Lng float64
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}
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// Valid returns whether a GeoPoint is within [-90, 90] latitude and [-180, 180] longitude.
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func (g GeoPoint) Valid() bool {
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return -90 <= g.Lat && g.Lat <= 90 && -180 <= g.Lng && g.Lng <= 180
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}
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func keyToProto(k *Key) *pb.Key {
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if k == nil {
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return nil
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}
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var path []*pb.Key_PathElement
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for {
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el := &pb.Key_PathElement{Kind: k.Kind}
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if k.ID != 0 {
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el.IdType = &pb.Key_PathElement_Id{Id: k.ID}
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} else if k.Name != "" {
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el.IdType = &pb.Key_PathElement_Name{Name: k.Name}
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}
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path = append(path, el)
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if k.Parent == nil {
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break
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}
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k = k.Parent
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}
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// The path should be in order [grandparent, parent, child]
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// We did it backward above, so reverse back.
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for i := 0; i < len(path)/2; i++ {
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path[i], path[len(path)-i-1] = path[len(path)-i-1], path[i]
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}
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key := &pb.Key{Path: path}
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if k.Namespace != "" {
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key.PartitionId = &pb.PartitionId{
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NamespaceId: k.Namespace,
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}
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}
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return key
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}
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// protoToKey decodes a protocol buffer representation of a key into an
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// equivalent *Key object. If the key is invalid, protoToKey will return the
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// invalid key along with ErrInvalidKey.
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func protoToKey(p *pb.Key) (*Key, error) {
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var key *Key
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var namespace string
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if partition := p.PartitionId; partition != nil {
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namespace = partition.NamespaceId
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}
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for _, el := range p.Path {
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key = &Key{
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Namespace: namespace,
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Kind: el.Kind,
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ID: el.GetId(),
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Name: el.GetName(),
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Parent: key,
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}
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}
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if !key.valid() { // Also detects key == nil.
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return key, ErrInvalidKey
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}
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return key, nil
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}
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// multiKeyToProto is a batch version of keyToProto.
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func multiKeyToProto(keys []*Key) []*pb.Key {
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ret := make([]*pb.Key, len(keys))
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for i, k := range keys {
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ret[i] = keyToProto(k)
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}
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return ret
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}
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// multiKeyToProto is a batch version of keyToProto.
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func multiProtoToKey(keys []*pb.Key) ([]*Key, error) {
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hasErr := false
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ret := make([]*Key, len(keys))
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err := make(MultiError, len(keys))
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for i, k := range keys {
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ret[i], err[i] = protoToKey(k)
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if err[i] != nil {
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hasErr = true
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}
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}
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if hasErr {
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return nil, err
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}
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return ret, nil
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}
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// multiValid is a batch version of Key.valid. It returns an error, not a
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// []bool.
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func multiValid(key []*Key) error {
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invalid := false
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for _, k := range key {
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if !k.valid() {
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invalid = true
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break
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}
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}
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if !invalid {
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return nil
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}
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err := make(MultiError, len(key))
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for i, k := range key {
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if !k.valid() {
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err[i] = ErrInvalidKey
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}
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}
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return err
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}
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// checkMultiArg checks that v has type []S, []*S, []I, or []P, for some struct
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// type S, for some interface type I, or some non-interface non-pointer type P
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// such that P or *P implements PropertyLoadSaver.
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//
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// It returns what category the slice's elements are, and the reflect.Type
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// that represents S, I or P.
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//
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// As a special case, PropertyList is an invalid type for v.
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//
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// TODO(djd): multiArg is very confusing. Fold this logic into the
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// relevant Put/Get methods to make the logic less opaque.
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func checkMultiArg(v reflect.Value) (m multiArgType, elemType reflect.Type) {
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if v.Kind() != reflect.Slice {
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return multiArgTypeInvalid, nil
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}
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if v.Type() == typeOfPropertyList {
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return multiArgTypeInvalid, nil
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}
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elemType = v.Type().Elem()
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if reflect.PtrTo(elemType).Implements(typeOfPropertyLoadSaver) {
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return multiArgTypePropertyLoadSaver, elemType
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}
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switch elemType.Kind() {
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case reflect.Struct:
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return multiArgTypeStruct, elemType
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case reflect.Interface:
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return multiArgTypeInterface, elemType
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case reflect.Ptr:
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elemType = elemType.Elem()
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if elemType.Kind() == reflect.Struct {
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return multiArgTypeStructPtr, elemType
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}
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}
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return multiArgTypeInvalid, nil
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}
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// Close closes the Client.
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func (c *Client) Close() error {
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return c.conn.Close()
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}
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// Get loads the entity stored for key into dst, which must be a struct pointer
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// or implement PropertyLoadSaver. If there is no such entity for the key, Get
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// returns ErrNoSuchEntity.
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//
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// The values of dst's unmatched struct fields are not modified, and matching
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// slice-typed fields are not reset before appending to them. In particular, it
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// is recommended to pass a pointer to a zero valued struct on each Get call.
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//
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// ErrFieldMismatch is returned when a field is to be loaded into a different
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// type than the one it was stored from, or when a field is missing or
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// unexported in the destination struct. ErrFieldMismatch is only returned if
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// dst is a struct pointer.
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func (c *Client) Get(ctx context.Context, key *Key, dst interface{}) (err error) {
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ctx = trace.StartSpan(ctx, "cloud.google.com/go/datastore.Get")
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defer func() { trace.EndSpan(ctx, err) }()
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if dst == nil { // get catches nil interfaces; we need to catch nil ptr here
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return ErrInvalidEntityType
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}
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err = c.get(ctx, []*Key{key}, []interface{}{dst}, nil)
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if me, ok := err.(MultiError); ok {
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return me[0]
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}
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return err
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}
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// GetMulti is a batch version of Get.
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//
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// dst must be a []S, []*S, []I or []P, for some struct type S, some interface
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// type I, or some non-interface non-pointer type P such that P or *P
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// implements PropertyLoadSaver. If an []I, each element must be a valid dst
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// for Get: it must be a struct pointer or implement PropertyLoadSaver.
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//
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// As a special case, PropertyList is an invalid type for dst, even though a
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// PropertyList is a slice of structs. It is treated as invalid to avoid being
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// mistakenly passed when []PropertyList was intended.
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func (c *Client) GetMulti(ctx context.Context, keys []*Key, dst interface{}) (err error) {
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ctx = trace.StartSpan(ctx, "cloud.google.com/go/datastore.GetMulti")
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defer func() { trace.EndSpan(ctx, err) }()
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return c.get(ctx, keys, dst, nil)
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}
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func (c *Client) get(ctx context.Context, keys []*Key, dst interface{}, opts *pb.ReadOptions) error {
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v := reflect.ValueOf(dst)
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multiArgType, _ := checkMultiArg(v)
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// Sanity checks
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if multiArgType == multiArgTypeInvalid {
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return errors.New("datastore: dst has invalid type")
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}
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if len(keys) != v.Len() {
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return errors.New("datastore: keys and dst slices have different length")
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}
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if len(keys) == 0 {
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return nil
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}
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// Go through keys, validate them, serialize then, and create a dict mapping them to their indices.
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// Equal keys are deduped.
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multiErr, any := make(MultiError, len(keys)), false
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keyMap := make(map[string][]int, len(keys))
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pbKeys := make([]*pb.Key, 0, len(keys))
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for i, k := range keys {
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if !k.valid() {
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multiErr[i] = ErrInvalidKey
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any = true
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} else {
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ks := k.String()
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if _, ok := keyMap[ks]; !ok {
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pbKeys = append(pbKeys, keyToProto(k))
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}
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keyMap[ks] = append(keyMap[ks], i)
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}
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}
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if any {
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return multiErr
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}
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req := &pb.LookupRequest{
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ProjectId: c.dataset,
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Keys: pbKeys,
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ReadOptions: opts,
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}
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resp, err := c.client.Lookup(ctx, req)
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if err != nil {
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return err
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}
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found := resp.Found
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missing := resp.Missing
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// Upper bound 100 iterations to prevent infinite loop.
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// We choose 100 iterations somewhat logically:
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// Max number of Entities you can request from Datastore is 1,000.
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// Max size for a Datastore Entity is 1 MiB.
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// Max request size is 10 MiB, so we assume max response size is also 10 MiB.
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// 1,000 / 10 = 100.
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// Note that if ctx has a deadline, the deadline will probably
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// be hit before we reach 100 iterations.
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for i := 0; len(resp.Deferred) > 0 && i < 100; i++ {
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req.Keys = resp.Deferred
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resp, err = c.client.Lookup(ctx, req)
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if err != nil {
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return err
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}
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found = append(found, resp.Found...)
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missing = append(missing, resp.Missing...)
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}
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filled := 0
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for _, e := range found {
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k, err := protoToKey(e.Entity.Key)
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if err != nil {
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return errors.New("datastore: internal error: server returned an invalid key")
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}
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filled += len(keyMap[k.String()])
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for _, index := range keyMap[k.String()] {
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elem := v.Index(index)
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if multiArgType == multiArgTypePropertyLoadSaver || multiArgType == multiArgTypeStruct {
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elem = elem.Addr()
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}
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if multiArgType == multiArgTypeStructPtr && elem.IsNil() {
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elem.Set(reflect.New(elem.Type().Elem()))
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}
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if err := loadEntityProto(elem.Interface(), e.Entity); err != nil {
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multiErr[index] = err
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any = true
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}
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}
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}
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for _, e := range missing {
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k, err := protoToKey(e.Entity.Key)
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if err != nil {
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return errors.New("datastore: internal error: server returned an invalid key")
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}
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filled += len(keyMap[k.String()])
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for _, index := range keyMap[k.String()] {
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multiErr[index] = ErrNoSuchEntity
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}
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any = true
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}
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if filled != len(keys) {
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return errors.New("datastore: internal error: server returned the wrong number of entities")
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}
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if any {
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return multiErr
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}
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return nil
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}
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// Put saves the entity src into the datastore with key k. src must be a struct
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// pointer or implement PropertyLoadSaver; if a struct pointer then any
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// unexported fields of that struct will be skipped. If k is an incomplete key,
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// the returned key will be a unique key generated by the datastore.
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func (c *Client) Put(ctx context.Context, key *Key, src interface{}) (*Key, error) {
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k, err := c.PutMulti(ctx, []*Key{key}, []interface{}{src})
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if err != nil {
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if me, ok := err.(MultiError); ok {
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return nil, me[0]
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}
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return nil, err
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}
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return k[0], nil
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}
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// PutMulti is a batch version of Put.
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//
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// src must satisfy the same conditions as the dst argument to GetMulti.
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// TODO(jba): rewrite in terms of Mutate.
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func (c *Client) PutMulti(ctx context.Context, keys []*Key, src interface{}) (ret []*Key, err error) {
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ctx = trace.StartSpan(ctx, "cloud.google.com/go/datastore.PutMulti")
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defer func() { trace.EndSpan(ctx, err) }()
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mutations, err := putMutations(keys, src)
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if err != nil {
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return nil, err
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}
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// Make the request.
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req := &pb.CommitRequest{
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ProjectId: c.dataset,
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Mutations: mutations,
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Mode: pb.CommitRequest_NON_TRANSACTIONAL,
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}
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resp, err := c.client.Commit(ctx, req)
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if err != nil {
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return nil, err
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}
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// Copy any newly minted keys into the returned keys.
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ret = make([]*Key, len(keys))
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for i, key := range keys {
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if key.Incomplete() {
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// This key is in the mutation results.
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ret[i], err = protoToKey(resp.MutationResults[i].Key)
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if err != nil {
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return nil, errors.New("datastore: internal error: server returned an invalid key")
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}
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} else {
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ret[i] = key
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}
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}
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return ret, nil
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}
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func putMutations(keys []*Key, src interface{}) ([]*pb.Mutation, error) {
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v := reflect.ValueOf(src)
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multiArgType, _ := checkMultiArg(v)
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if multiArgType == multiArgTypeInvalid {
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return nil, errors.New("datastore: src has invalid type")
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}
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if len(keys) != v.Len() {
|
|
return nil, errors.New("datastore: key and src slices have different length")
|
|
}
|
|
if len(keys) == 0 {
|
|
return nil, nil
|
|
}
|
|
if err := multiValid(keys); err != nil {
|
|
return nil, err
|
|
}
|
|
mutations := make([]*pb.Mutation, 0, len(keys))
|
|
multiErr := make(MultiError, len(keys))
|
|
hasErr := false
|
|
for i, k := range keys {
|
|
elem := v.Index(i)
|
|
// Two cases where we need to take the address:
|
|
// 1) multiArgTypePropertyLoadSaver => &elem implements PLS
|
|
// 2) multiArgTypeStruct => saveEntity needs *struct
|
|
if multiArgType == multiArgTypePropertyLoadSaver || multiArgType == multiArgTypeStruct {
|
|
elem = elem.Addr()
|
|
}
|
|
p, err := saveEntity(k, elem.Interface())
|
|
if err != nil {
|
|
multiErr[i] = err
|
|
hasErr = true
|
|
}
|
|
var mut *pb.Mutation
|
|
if k.Incomplete() {
|
|
mut = &pb.Mutation{Operation: &pb.Mutation_Insert{Insert: p}}
|
|
} else {
|
|
mut = &pb.Mutation{Operation: &pb.Mutation_Upsert{Upsert: p}}
|
|
}
|
|
mutations = append(mutations, mut)
|
|
}
|
|
if hasErr {
|
|
return nil, multiErr
|
|
}
|
|
return mutations, nil
|
|
}
|
|
|
|
// Delete deletes the entity for the given key.
|
|
func (c *Client) Delete(ctx context.Context, key *Key) error {
|
|
err := c.DeleteMulti(ctx, []*Key{key})
|
|
if me, ok := err.(MultiError); ok {
|
|
return me[0]
|
|
}
|
|
return err
|
|
}
|
|
|
|
// DeleteMulti is a batch version of Delete.
|
|
// TODO(jba): rewrite in terms of Mutate.
|
|
func (c *Client) DeleteMulti(ctx context.Context, keys []*Key) (err error) {
|
|
ctx = trace.StartSpan(ctx, "cloud.google.com/go/datastore.DeleteMulti")
|
|
defer func() { trace.EndSpan(ctx, err) }()
|
|
|
|
mutations, err := deleteMutations(keys)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
req := &pb.CommitRequest{
|
|
ProjectId: c.dataset,
|
|
Mutations: mutations,
|
|
Mode: pb.CommitRequest_NON_TRANSACTIONAL,
|
|
}
|
|
_, err = c.client.Commit(ctx, req)
|
|
return err
|
|
}
|
|
|
|
func deleteMutations(keys []*Key) ([]*pb.Mutation, error) {
|
|
mutations := make([]*pb.Mutation, 0, len(keys))
|
|
set := make(map[string]bool, len(keys))
|
|
for _, k := range keys {
|
|
if k.Incomplete() {
|
|
return nil, fmt.Errorf("datastore: can't delete the incomplete key: %v", k)
|
|
}
|
|
ks := k.String()
|
|
if !set[ks] {
|
|
mutations = append(mutations, &pb.Mutation{
|
|
Operation: &pb.Mutation_Delete{Delete: keyToProto(k)},
|
|
})
|
|
}
|
|
set[ks] = true
|
|
}
|
|
return mutations, nil
|
|
}
|
|
|
|
// Mutate applies one or more mutations atomically.
|
|
// It returns the keys of the argument Mutations, in the same order.
|
|
//
|
|
// If any of the mutations are invalid, Mutate returns a MultiError with the errors.
|
|
// Mutate returns a MultiError in this case even if there is only one Mutation.
|
|
func (c *Client) Mutate(ctx context.Context, muts ...*Mutation) (ret []*Key, err error) {
|
|
ctx = trace.StartSpan(ctx, "cloud.google.com/go/datastore.Mutate")
|
|
defer func() { trace.EndSpan(ctx, err) }()
|
|
|
|
pmuts, err := mutationProtos(muts)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
req := &pb.CommitRequest{
|
|
ProjectId: c.dataset,
|
|
Mutations: pmuts,
|
|
Mode: pb.CommitRequest_NON_TRANSACTIONAL,
|
|
}
|
|
resp, err := c.client.Commit(ctx, req)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Copy any newly minted keys into the returned keys.
|
|
ret = make([]*Key, len(muts))
|
|
for i, mut := range muts {
|
|
if mut.key.Incomplete() {
|
|
// This key is in the mutation results.
|
|
ret[i], err = protoToKey(resp.MutationResults[i].Key)
|
|
if err != nil {
|
|
return nil, errors.New("datastore: internal error: server returned an invalid key")
|
|
}
|
|
} else {
|
|
ret[i] = mut.key
|
|
}
|
|
}
|
|
return ret, nil
|
|
}
|