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dex/vendor/google.golang.org/grpc/grpclb/grpclb_test.go

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2016-10-04 12:58:50 +05:30
/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpclb
import (
"fmt"
"net"
"strconv"
"strings"
"testing"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
lbpb "google.golang.org/grpc/grpclb/grpc_lb_v1"
"google.golang.org/grpc/naming"
)
type testWatcher struct {
// the channel to receives name resolution updates
update chan *naming.Update
// the side channel to get to know how many updates in a batch
side chan int
// the channel to notifiy update injector that the update reading is done
readDone chan int
}
func (w *testWatcher) Next() (updates []*naming.Update, err error) {
n, ok := <-w.side
if !ok {
return nil, fmt.Errorf("w.side is closed")
}
for i := 0; i < n; i++ {
u, ok := <-w.update
if !ok {
break
}
if u != nil {
updates = append(updates, u)
}
}
w.readDone <- 0
return
}
func (w *testWatcher) Close() {
}
// Inject naming resolution updates to the testWatcher.
func (w *testWatcher) inject(updates []*naming.Update) {
w.side <- len(updates)
for _, u := range updates {
w.update <- u
}
<-w.readDone
}
type testNameResolver struct {
w *testWatcher
addr string
}
func (r *testNameResolver) Resolve(target string) (naming.Watcher, error) {
r.w = &testWatcher{
update: make(chan *naming.Update, 1),
side: make(chan int, 1),
readDone: make(chan int),
}
r.w.side <- 1
r.w.update <- &naming.Update{
Op: naming.Add,
Addr: r.addr,
}
go func() {
<-r.w.readDone
}()
return r.w, nil
}
type remoteBalancer struct {
servers *lbpb.ServerList
done chan struct{}
}
func newRemoteBalancer(servers *lbpb.ServerList) *remoteBalancer {
return &remoteBalancer{
servers: servers,
done: make(chan struct{}),
}
}
func (b *remoteBalancer) stop() {
close(b.done)
}
func (b *remoteBalancer) BalanceLoad(stream lbpb.LoadBalancer_BalanceLoadServer) error {
resp := &lbpb.LoadBalanceResponse{
LoadBalanceResponseType: &lbpb.LoadBalanceResponse_InitialResponse{
InitialResponse: new(lbpb.InitialLoadBalanceResponse),
},
}
if err := stream.Send(resp); err != nil {
return err
}
resp = &lbpb.LoadBalanceResponse{
LoadBalanceResponseType: &lbpb.LoadBalanceResponse_ServerList{
ServerList: b.servers,
},
}
if err := stream.Send(resp); err != nil {
return err
}
<-b.done
return nil
}
func startBackends(lis ...net.Listener) (servers []*grpc.Server) {
for _, l := range lis {
s := grpc.NewServer()
servers = append(servers, s)
go func(s *grpc.Server, l net.Listener) {
s.Serve(l)
}(s, l)
}
return
}
func stopBackends(servers []*grpc.Server) {
for _, s := range servers {
s.Stop()
}
}
func TestGRPCLB(t *testing.T) {
// Start a backend.
beLis, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Failed to listen %v", err)
}
backends := startBackends(beLis)
defer stopBackends(backends)
// Start a load balancer.
lis, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Failed to create the listener for the load balancer %v", err)
}
lb := grpc.NewServer()
addr := strings.Split(lis.Addr().String(), ":")
port, err := strconv.Atoi(addr[1])
if err != nil {
t.Fatalf("Failed to generate the port number %v", err)
}
be := &lbpb.Server{
IpAddress: []byte(addr[0]),
Port: int32(port),
}
var bes []*lbpb.Server
bes = append(bes, be)
sl := &lbpb.ServerList{
Servers: bes,
}
ls := newRemoteBalancer(sl)
lbpb.RegisterLoadBalancerServer(lb, ls)
go func() {
lb.Serve(lis)
}()
defer func() {
ls.stop()
lb.Stop()
}()
cc, err := grpc.Dial("foo.bar.com", grpc.WithBalancer(Balancer(&testNameResolver{
addr: lis.Addr().String(),
})), grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
t.Fatalf("Failed to dial to the backend %v", err)
}
// Issue an unimplemented RPC and expect codes.Unimplemented.
var (
req, reply lbpb.Duration
)
if err := grpc.Invoke(context.Background(), "/foo/bar", &req, &reply, cc); err == nil || grpc.Code(err) != codes.Unimplemented {
t.Fatalf("grpc.Invoke(_, _, _, _, _) = %v, want error code %s", err, codes.Unimplemented)
}
cc.Close()
}