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// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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 bytestream
import (
"bytes"
"errors"
"fmt"
"io"
"log"
"net"
"testing"
"golang.org/x/net/context"
"google.golang.org/api/transport/bytestream/internal"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
pb "google.golang.org/genproto/googleapis/bytestream"
)
const testData = "0123456789"
// A grpcServer is an in-process gRPC server, listening on a system-chosen port on
// the local loopback interface. Servers are for testing only and are not
// intended to be used in production code.
// (Copied from "cloud.google.com/internal/testutil/server_test.go")
//
// To create a server, make a new grpcServer, register your handlers, then call
// Start:
//
// srv, err := NewServer()
// ...
// mypb.RegisterMyServiceServer(srv.Gsrv, &myHandler)
// ....
// srv.Start()
//
// Clients should connect to the server with no security:
//
// conn, err := grpc.Dial(srv.Addr, grpc.WithInsecure())
// ...
type grpcServer struct {
Addr string
l net.Listener
Gsrv *grpc.Server
}
type TestSetup struct {
ctx context.Context
rpcTest *grpcServer
server *internal.Server
client *Client
}
func TestClientRead(t *testing.T) {
testCases := []struct {
name string
input string
resourceName string
extraBufSize int
extraError error
want string
wantErr bool
wantEOF bool
}{
{
name: "test foo",
input: testData,
resourceName: "foo",
want: testData,
}, {
name: "test bar",
input: testData,
resourceName: "bar",
want: testData,
}, {
name: "test bar extraBufSize=1",
input: testData,
resourceName: "bar",
extraBufSize: 1,
want: testData,
wantEOF: true,
}, {
name: "test bar extraBufSize=2",
input: testData,
resourceName: "bar",
extraBufSize: 2,
want: testData,
wantEOF: true,
}, {
name: "empty resource name",
input: testData,
resourceName: "",
extraBufSize: 1,
wantErr: true,
}, {
name: "read after error returns error again",
input: testData,
resourceName: "does not matter",
extraBufSize: 1,
extraError: errors.New("some error"),
wantErr: true,
},
}
for _, tc := range testCases {
bufSize := len(tc.want) + tc.extraBufSize
if bufSize == 0 {
t.Errorf("%s: This is probably wrong. Read returning 0 bytes?", tc.name)
continue
}
setup := newTestSetup(tc.input)
r, err := setup.client.NewReader(setup.ctx, tc.resourceName)
if err != nil {
t.Errorf("%s: NewReader(%q): %v", tc.name, tc.resourceName, err)
continue
}
if tc.extraError != nil {
r.err = tc.extraError
}
buf := make([]byte, bufSize)
gotEOF := false
total := 0
for total < bufSize && err == nil {
var n int
n, err = r.Read(buf[total:])
total += n
}
if err == io.EOF {
gotEOF = true
err = nil
doubleCheckBuf := make([]byte, bufSize)
n2, err2 := r.Read(doubleCheckBuf)
if err2 != io.EOF {
t.Errorf("%s: read and got EOF, double-check: read %d bytes got err=%v", tc.name, n2, err2)
continue
}
}
setup.Close()
if gotErr := err != nil; tc.wantErr != gotErr {
t.Errorf("%s: read %d bytes, got err=%v, wantErr=%t", tc.name, total, err, tc.wantErr)
continue
}
if tc.wantEOF != gotEOF {
t.Errorf("%s: read %d bytes, gotEOF=%t, wantEOF=%t", tc.name, total, gotEOF, tc.wantEOF)
continue
}
if got := string(buf[:total]); got != tc.want {
t.Errorf("%s: read %q, want %q", tc.name, got, tc.want)
continue
}
}
}
func TestClientWrite(t *testing.T) {
testCases := []struct {
name string
resourceName string
maxBufSize int
data string
results []int
wantWriteErr bool
wantCloseErr bool
}{
{
name: "test foo",
resourceName: "foo",
data: testData,
results: []int{len(testData)},
}, {
name: "empty resource name",
resourceName: "",
data: testData,
results: []int{10},
//wantWriteErr: true,
wantCloseErr: true,
}, {
name: "test bar",
resourceName: "bar",
data: testData,
results: []int{len(testData)},
},
}
var setup *TestSetup
tcFor:
for _, tc := range testCases {
if setup != nil {
setup.Close()
}
setup = newTestSetup("")
buf := []byte(tc.data)
var ofs int
w, err := setup.client.NewWriter(setup.ctx, tc.resourceName)
if err != nil {
t.Errorf("%s: NewWriter(): %v", tc.name, err)
continue
}
for i := 0; i < len(tc.results); i++ {
if ofs >= len(tc.data) {
t.Errorf("%s [%d]: Attempting to write more than tc.input: ofs=%d len(buf)=%d",
tc.name, i, ofs, len(tc.data))
continue tcFor
}
n, err := w.Write(buf[ofs:])
ofs += n
if gotErr := err != nil; gotErr != tc.wantWriteErr {
t.Errorf("%s [%d]: Write() got n=%d err=%v, wantWriteErr=%t", tc.name, i, n, err, tc.wantWriteErr)
continue tcFor
} else if tc.wantWriteErr && i+1 < len(tc.results) {
t.Errorf("%s: wantWriteErr and got err after %d results, len(results)=%d is too long.", tc.name, i+1, len(tc.results))
continue tcFor
}
if n != tc.results[i] {
t.Errorf("%s [%d]: Write() wrote %d bytes, want %d bytes", tc.name, i, n, tc.results[i])
continue tcFor
}
}
err = w.Close()
if gotErr := err != nil; gotErr != tc.wantCloseErr {
t.Errorf("%s: Close() got err=%v, wantCloseErr=%t", tc.name, err, tc.wantCloseErr)
continue tcFor
}
}
setup.Close()
}
func TestClientRead_AfterSetupClose(t *testing.T) {
setup := newTestSetup("closed")
setup.Close()
_, err := setup.client.NewReader(setup.ctx, "should fail")
if err == nil {
t.Errorf("NewReader(%q): err=%v", "should fail", err)
}
}
func TestClientWrite_AfterSetupClose(t *testing.T) {
setup := newTestSetup("closed")
setup.Close()
_, err := setup.client.NewWriter(setup.ctx, "should fail")
if err == nil {
t.Fatalf("NewWriter(%q): err=%v", "shoudl fail", err)
}
}
type UnsendableWriteClient struct {
closeAndRecvWriteResponse *pb.WriteResponse
closeAndRecvError error
}
func (w *UnsendableWriteClient) Send(*pb.WriteRequest) error {
if w.closeAndRecvError != nil {
return nil
}
return errors.New("UnsendableWriteClient.Send() fails unless closeAndRecvError is set")
}
func (w *UnsendableWriteClient) CloseAndRecv() (*pb.WriteResponse, error) {
if w.closeAndRecvError == nil {
log.Fatalf("UnsendableWriteClient.Close() when closeAndRecvError == nil.")
}
return w.closeAndRecvWriteResponse, w.closeAndRecvError
}
func (w *UnsendableWriteClient) Context() context.Context {
log.Fatalf("UnsendableWriteClient.Context() should never be called")
return context.Background()
}
func (w *UnsendableWriteClient) CloseSend() error {
return errors.New("UnsendableWriteClient.CloseSend() should never be called")
}
func (w *UnsendableWriteClient) Header() (metadata.MD, error) {
log.Fatalf("UnsendableWriteClient.Header() should never be called")
return metadata.MD{}, nil
}
func (w *UnsendableWriteClient) Trailer() metadata.MD {
log.Fatalf("UnsendableWriteClient.Trailer() should never be called")
return metadata.MD{}
}
func (fake *UnsendableWriteClient) SendMsg(m interface{}) error {
log.Fatalf("UnsendableWriteClient.SendMsg() should never be called")
return nil
}
func (fake *UnsendableWriteClient) RecvMsg(m interface{}) error {
log.Fatalf("UnsendableWriteClient.RecvMsg() should never be called")
return nil
}
func TestClientWrite_WriteFails(t *testing.T) {
setup := newTestSetup("")
w, err := setup.client.NewWriter(setup.ctx, "")
if err != nil {
t.Fatalf("NewWriter(): %v", err)
}
defer setup.Close()
w.writeClient = &UnsendableWriteClient{}
_, err = w.Write([]byte(testData))
if err == nil {
t.Errorf("Write() should fail")
}
}
func TestClientWrite_CloseAndRecvFails(t *testing.T) {
setup := newTestSetup("")
w, err := setup.client.NewWriter(setup.ctx, "CloseAndRecvFails")
if err != nil {
t.Fatalf("NewWriter(): %v", err)
}
defer setup.Close()
n, err := w.Write([]byte(testData))
if err != nil {
t.Errorf("Write() failed: %v", err)
return
}
if n != len(testData) {
t.Errorf("Write() got n=%d, want n=%d", n, len(testData))
return
}
w.writeClient = &UnsendableWriteClient{
closeAndRecvError: errors.New("CloseAndRecv() must fail"),
}
if err = w.Close(); err == nil {
t.Errorf("Close() should fail")
return
}
}
type TestWriteHandler struct {
buf bytes.Buffer // bytes.Buffer implements io.Writer
name string // This service can handle one name only.
}
func (w *TestWriteHandler) GetWriter(ctx context.Context, name string, initOffset int64) (io.Writer, error) {
if w.name == "" {
w.name = name
} else if w.name != name {
return nil, fmt.Errorf("writer already has name=%q, now a new name=%q confuses me", w.name, name)
}
// initOffset is ignored.
return &w.buf, nil
}
func (w *TestWriteHandler) Close(ctx context.Context, name string) error {
w.name = ""
w.buf.Reset()
return nil
}
type TestReadHandler struct {
buf string
name string // This service can handle one name only.
}
// GetWriter() returns an io.ReaderAt to accept reads from the given name.
func (r *TestReadHandler) GetReader(ctx context.Context, name string) (io.ReaderAt, error) {
if r.name == "" {
r.name = name
} else if r.name != name {
return nil, fmt.Errorf("reader already has name=%q, now a new name=%q confuses me", r.name, name)
}
return bytes.NewReader([]byte(r.buf)), nil
}
// Close does nothing.
func (r *TestReadHandler) Close(ctx context.Context, name string) error {
return nil
}
// newGRPCServer creates a new grpcServer. The grpcServer will be listening for gRPC connections
// at the address named by the Addr field, without TLS.
func newGRPCServer() (*grpcServer, error) {
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return nil, err
}
s := &grpcServer{
Addr: l.Addr().String(),
l: l,
Gsrv: grpc.NewServer(),
}
return s, nil
}
// Start causes the server to start accepting incoming connections.
// Call Start after registering handlers.
func (s *grpcServer) Start() {
go s.Gsrv.Serve(s.l)
}
// Close shuts down the server.
func (s *grpcServer) Close() {
s.Gsrv.Stop()
s.l.Close()
}
func newTestSetup(input string) *TestSetup {
testSetup := &TestSetup{
ctx: context.Background(),
}
testReadHandler := &TestReadHandler{
buf: input,
}
var err error
if testSetup.rpcTest, err = newGRPCServer(); err != nil {
log.Fatalf("newGRPCServer: %v", err)
}
if testSetup.server, err = internal.NewServer(testSetup.rpcTest.Gsrv, testReadHandler, &TestWriteHandler{}); err != nil {
log.Fatalf("internal.NewServer: %v", err)
}
testSetup.rpcTest.Start()
conn, err := grpc.Dial(testSetup.rpcTest.Addr, grpc.WithInsecure())
if err != nil {
log.Fatalf("grpc.Dial: %v", err)
}
testSetup.client = NewClient(conn, grpc.FailFast(true))
return testSetup
}
func (testSetup *TestSetup) Close() {
testSetup.rpcTest.Close()
}
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