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