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// Copyright 2016 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 internal
import (
"bytes"
"io"
"log"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
type ExampleReadHandler struct {
buf []byte
name string // In this example, the service can handle one name only.
}
func (mr *ExampleReadHandler) GetReader(ctx context.Context, name string) (io.ReaderAt, error) {
if mr.name == "" {
mr.name = name
log.Printf("read from name: %q", name)
} else if mr.name != name {
return nil, grpc.Errorf(codes.NotFound, "reader has name %q, name %q not allowed", mr.name, name)
}
return bytes.NewReader(mr.buf), nil
}
// Close can be a no-op.
func (mr *ExampleReadHandler) Close(ctx context.Context, name string) error {
return nil
}
type ExampleWriteHandler struct {
buf bytes.Buffer // bytes.Buffer implements io.Writer
name string // In this example, the service can handle one name only.
}
// Handle writes to a given name.
func (mw *ExampleWriteHandler) GetWriter(ctx context.Context, name string, initOffset int64) (io.Writer, error) {
if mw.name == "" {
mw.name = name
log.Printf("write to name: %q", name)
} else if mw.name != name {
return nil, grpc.Errorf(codes.NotFound, "reader has name %q, name=%q not allowed", mw.name, name)
}
// TODO: initOffset is ignored.
return &mw.buf, nil
}
// Close can be a no-op.
func (mw *ExampleWriteHandler) Close(ctx context.Context, name string) error {
return nil
}
func ExampleNewServer() {
reader := &ExampleReadHandler{
buf: []byte("Hello World!"),
name: "foo",
}
writer := &ExampleWriteHandler{}
gsrv := grpc.NewServer()
bytestreamServer, err := NewServer(gsrv, reader, writer)
if err != nil {
log.Printf("NewServer: %v", err)
return
}
// Start accepting incoming connections.
// See gRPC docs and newGRPCServer in google.golang.org/api/transport/bytestream/client_test.go.
_ = bytestreamServer
}
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