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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 (
"context"
"fmt"
"time"
"cloud.google.com/go/internal"
"cloud.google.com/go/internal/version"
gax "github.com/googleapis/gax-go/v2"
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.ClientConnInterface, 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{Initial: 100 * time.Millisecond}, 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
}
// Only retry on UNAVAILABLE as per https://aip.dev/194. Other errors from
// https://cloud.google.com/datastore/docs/concepts/errors may be retried
// by the user if desired, but are not retried by the clientg.
return s.Code() == codes.Unavailable
}
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