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- // Copyright 2017 Google LLC
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package datastore
-
- import (
- "fmt"
-
- gax "github.com/googleapis/gax-go"
-
- "cloud.google.com/go/internal"
- "cloud.google.com/go/internal/version"
- "golang.org/x/net/context"
- pb "google.golang.org/genproto/googleapis/datastore/v1"
- "google.golang.org/grpc"
- "google.golang.org/grpc/codes"
- "google.golang.org/grpc/metadata"
- "google.golang.org/grpc/status"
- )
-
- // datastoreClient is a wrapper for the pb.DatastoreClient that includes gRPC
- // metadata to be sent in each request for server-side traffic management.
- type datastoreClient struct {
- // Embed so we still implement the DatastoreClient interface,
- // if the interface adds more methods.
- pb.DatastoreClient
-
- c pb.DatastoreClient
- md metadata.MD
- }
-
- func newDatastoreClient(conn *grpc.ClientConn, projectID string) pb.DatastoreClient {
- return &datastoreClient{
- c: pb.NewDatastoreClient(conn),
- md: metadata.Pairs(
- resourcePrefixHeader, "projects/"+projectID,
- "x-goog-api-client", fmt.Sprintf("gl-go/%s gccl/%s grpc/", version.Go(), version.Repo)),
- }
- }
-
- func (dc *datastoreClient) Lookup(ctx context.Context, in *pb.LookupRequest, opts ...grpc.CallOption) (res *pb.LookupResponse, err error) {
- err = dc.invoke(ctx, func(ctx context.Context) error {
- res, err = dc.c.Lookup(ctx, in, opts...)
- return err
- })
- return res, err
- }
-
- func (dc *datastoreClient) RunQuery(ctx context.Context, in *pb.RunQueryRequest, opts ...grpc.CallOption) (res *pb.RunQueryResponse, err error) {
- err = dc.invoke(ctx, func(ctx context.Context) error {
- res, err = dc.c.RunQuery(ctx, in, opts...)
- return err
- })
- return res, err
- }
-
- func (dc *datastoreClient) BeginTransaction(ctx context.Context, in *pb.BeginTransactionRequest, opts ...grpc.CallOption) (res *pb.BeginTransactionResponse, err error) {
- err = dc.invoke(ctx, func(ctx context.Context) error {
- res, err = dc.c.BeginTransaction(ctx, in, opts...)
- return err
- })
- return res, err
- }
-
- func (dc *datastoreClient) Commit(ctx context.Context, in *pb.CommitRequest, opts ...grpc.CallOption) (res *pb.CommitResponse, err error) {
- err = dc.invoke(ctx, func(ctx context.Context) error {
- res, err = dc.c.Commit(ctx, in, opts...)
- return err
- })
- return res, err
- }
-
- func (dc *datastoreClient) Rollback(ctx context.Context, in *pb.RollbackRequest, opts ...grpc.CallOption) (res *pb.RollbackResponse, err error) {
- err = dc.invoke(ctx, func(ctx context.Context) error {
- res, err = dc.c.Rollback(ctx, in, opts...)
- return err
- })
- return res, err
- }
-
- func (dc *datastoreClient) AllocateIds(ctx context.Context, in *pb.AllocateIdsRequest, opts ...grpc.CallOption) (res *pb.AllocateIdsResponse, err error) {
- err = dc.invoke(ctx, func(ctx context.Context) error {
- res, err = dc.c.AllocateIds(ctx, in, opts...)
- return err
- })
- return res, err
- }
-
- func (dc *datastoreClient) invoke(ctx context.Context, f func(ctx context.Context) error) error {
- ctx = metadata.NewOutgoingContext(ctx, dc.md)
- return internal.Retry(ctx, gax.Backoff{}, func() (stop bool, err error) {
- err = f(ctx)
- return !shouldRetry(err), err
- })
- }
-
- func shouldRetry(err error) bool {
- if err == nil {
- return false
- }
- s, ok := status.FromError(err)
- if !ok {
- return false
- }
- // See https://cloud.google.com/datastore/docs/concepts/errors.
- return s.Code() == codes.Unavailable || s.Code() == codes.DeadlineExceeded
- }
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