868 lines
25 KiB
Go
868 lines
25 KiB
Go
/*
|
|
*
|
|
* Copyright 2016 gRPC authors.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
//go:generate protoc --go_out=plugins=:. grpc_lb_v1/messages/messages.proto
|
|
//go:generate protoc --go_out=Mgrpc_lb_v1/messages/messages.proto=google.golang.org/grpc/grpclb/grpc_lb_v1/messages,plugins=grpc:. grpc_lb_v1/service/service.proto
|
|
|
|
// Package grpclb_test is currently used only for grpclb testing.
|
|
package grpclb_test
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"strings"
|
|
"sync"
|
|
"testing"
|
|
"time"
|
|
|
|
"github.com/golang/protobuf/proto"
|
|
"golang.org/x/net/context"
|
|
"google.golang.org/grpc"
|
|
"google.golang.org/grpc/codes"
|
|
"google.golang.org/grpc/credentials"
|
|
lbmpb "google.golang.org/grpc/grpclb/grpc_lb_v1/messages"
|
|
lbspb "google.golang.org/grpc/grpclb/grpc_lb_v1/service"
|
|
"google.golang.org/grpc/metadata"
|
|
"google.golang.org/grpc/naming"
|
|
testpb "google.golang.org/grpc/test/grpc_testing"
|
|
)
|
|
|
|
var (
|
|
lbsn = "bar.com"
|
|
besn = "foo.com"
|
|
lbToken = "iamatoken"
|
|
|
|
// Resolver replaces localhost with fakeName in Next().
|
|
// Dialer replaces fakeName with localhost when dialing.
|
|
// This will test that custom dialer is passed from Dial to grpclb.
|
|
fakeName = "fake.Name"
|
|
)
|
|
|
|
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 {
|
|
// Resolver replaces localhost with fakeName in Next().
|
|
// Custom dialer will replace fakeName with localhost when dialing.
|
|
u.Addr = strings.Replace(u.Addr, "localhost", fakeName, 1)
|
|
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
|
|
addrs []string
|
|
}
|
|
|
|
func (r *testNameResolver) Resolve(target string) (naming.Watcher, error) {
|
|
r.w = &testWatcher{
|
|
update: make(chan *naming.Update, len(r.addrs)),
|
|
side: make(chan int, 1),
|
|
readDone: make(chan int),
|
|
}
|
|
r.w.side <- len(r.addrs)
|
|
for _, addr := range r.addrs {
|
|
r.w.update <- &naming.Update{
|
|
Op: naming.Add,
|
|
Addr: addr,
|
|
Metadata: &naming.AddrMetadataGRPCLB{
|
|
AddrType: naming.GRPCLB,
|
|
ServerName: lbsn,
|
|
},
|
|
}
|
|
}
|
|
go func() {
|
|
<-r.w.readDone
|
|
}()
|
|
return r.w, nil
|
|
}
|
|
|
|
func (r *testNameResolver) inject(updates []*naming.Update) {
|
|
if r.w != nil {
|
|
r.w.inject(updates)
|
|
}
|
|
}
|
|
|
|
type serverNameCheckCreds struct {
|
|
mu sync.Mutex
|
|
sn string
|
|
expected string
|
|
}
|
|
|
|
func (c *serverNameCheckCreds) ServerHandshake(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
|
|
if _, err := io.WriteString(rawConn, c.sn); err != nil {
|
|
fmt.Printf("Failed to write the server name %s to the client %v", c.sn, err)
|
|
return nil, nil, err
|
|
}
|
|
return rawConn, nil, nil
|
|
}
|
|
func (c *serverNameCheckCreds) ClientHandshake(ctx context.Context, addr string, rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
b := make([]byte, len(c.expected))
|
|
if _, err := rawConn.Read(b); err != nil {
|
|
fmt.Printf("Failed to read the server name from the server %v", err)
|
|
return nil, nil, err
|
|
}
|
|
if c.expected != string(b) {
|
|
fmt.Printf("Read the server name %s want %s", string(b), c.expected)
|
|
return nil, nil, errors.New("received unexpected server name")
|
|
}
|
|
return rawConn, nil, nil
|
|
}
|
|
func (c *serverNameCheckCreds) Info() credentials.ProtocolInfo {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
return credentials.ProtocolInfo{}
|
|
}
|
|
func (c *serverNameCheckCreds) Clone() credentials.TransportCredentials {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
return &serverNameCheckCreds{
|
|
expected: c.expected,
|
|
}
|
|
}
|
|
func (c *serverNameCheckCreds) OverrideServerName(s string) error {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
c.expected = s
|
|
return nil
|
|
}
|
|
|
|
// fakeNameDialer replaces fakeName with localhost when dialing.
|
|
// This will test that custom dialer is passed from Dial to grpclb.
|
|
func fakeNameDialer(addr string, timeout time.Duration) (net.Conn, error) {
|
|
addr = strings.Replace(addr, fakeName, "localhost", 1)
|
|
return net.DialTimeout("tcp", addr, timeout)
|
|
}
|
|
|
|
type remoteBalancer struct {
|
|
sls []*lbmpb.ServerList
|
|
intervals []time.Duration
|
|
statsDura time.Duration
|
|
done chan struct{}
|
|
mu sync.Mutex
|
|
stats lbmpb.ClientStats
|
|
}
|
|
|
|
func newRemoteBalancer(sls []*lbmpb.ServerList, intervals []time.Duration) *remoteBalancer {
|
|
return &remoteBalancer{
|
|
sls: sls,
|
|
intervals: intervals,
|
|
done: make(chan struct{}),
|
|
}
|
|
}
|
|
|
|
func (b *remoteBalancer) stop() {
|
|
close(b.done)
|
|
}
|
|
|
|
func (b *remoteBalancer) BalanceLoad(stream lbspb.LoadBalancer_BalanceLoadServer) error {
|
|
req, err := stream.Recv()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
initReq := req.GetInitialRequest()
|
|
if initReq.Name != besn {
|
|
return grpc.Errorf(codes.InvalidArgument, "invalid service name: %v", initReq.Name)
|
|
}
|
|
resp := &lbmpb.LoadBalanceResponse{
|
|
LoadBalanceResponseType: &lbmpb.LoadBalanceResponse_InitialResponse{
|
|
InitialResponse: &lbmpb.InitialLoadBalanceResponse{
|
|
ClientStatsReportInterval: &lbmpb.Duration{
|
|
Seconds: int64(b.statsDura.Seconds()),
|
|
Nanos: int32(b.statsDura.Nanoseconds() - int64(b.statsDura.Seconds())*1e9),
|
|
},
|
|
},
|
|
},
|
|
}
|
|
if err := stream.Send(resp); err != nil {
|
|
return err
|
|
}
|
|
go func() {
|
|
for {
|
|
var (
|
|
req *lbmpb.LoadBalanceRequest
|
|
err error
|
|
)
|
|
if req, err = stream.Recv(); err != nil {
|
|
return
|
|
}
|
|
b.mu.Lock()
|
|
b.stats.NumCallsStarted += req.GetClientStats().NumCallsStarted
|
|
b.stats.NumCallsFinished += req.GetClientStats().NumCallsFinished
|
|
b.stats.NumCallsFinishedWithDropForRateLimiting += req.GetClientStats().NumCallsFinishedWithDropForRateLimiting
|
|
b.stats.NumCallsFinishedWithDropForLoadBalancing += req.GetClientStats().NumCallsFinishedWithDropForLoadBalancing
|
|
b.stats.NumCallsFinishedWithClientFailedToSend += req.GetClientStats().NumCallsFinishedWithClientFailedToSend
|
|
b.stats.NumCallsFinishedKnownReceived += req.GetClientStats().NumCallsFinishedKnownReceived
|
|
b.mu.Unlock()
|
|
}
|
|
}()
|
|
for k, v := range b.sls {
|
|
time.Sleep(b.intervals[k])
|
|
resp = &lbmpb.LoadBalanceResponse{
|
|
LoadBalanceResponseType: &lbmpb.LoadBalanceResponse_ServerList{
|
|
ServerList: v,
|
|
},
|
|
}
|
|
if err := stream.Send(resp); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
<-b.done
|
|
return nil
|
|
}
|
|
|
|
type testServer struct {
|
|
testpb.TestServiceServer
|
|
|
|
addr string
|
|
}
|
|
|
|
const testmdkey = "testmd"
|
|
|
|
func (s *testServer) EmptyCall(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) {
|
|
md, ok := metadata.FromIncomingContext(ctx)
|
|
if !ok {
|
|
return nil, grpc.Errorf(codes.Internal, "failed to receive metadata")
|
|
}
|
|
if md == nil || md["lb-token"][0] != lbToken {
|
|
return nil, grpc.Errorf(codes.Internal, "received unexpected metadata: %v", md)
|
|
}
|
|
grpc.SetTrailer(ctx, metadata.Pairs(testmdkey, s.addr))
|
|
return &testpb.Empty{}, nil
|
|
}
|
|
|
|
func (s *testServer) FullDuplexCall(stream testpb.TestService_FullDuplexCallServer) error {
|
|
return nil
|
|
}
|
|
|
|
func startBackends(sn string, lis ...net.Listener) (servers []*grpc.Server) {
|
|
for _, l := range lis {
|
|
creds := &serverNameCheckCreds{
|
|
sn: sn,
|
|
}
|
|
s := grpc.NewServer(grpc.Creds(creds))
|
|
testpb.RegisterTestServiceServer(s, &testServer{addr: l.Addr().String()})
|
|
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()
|
|
}
|
|
}
|
|
|
|
type testServers struct {
|
|
lbAddr string
|
|
ls *remoteBalancer
|
|
lb *grpc.Server
|
|
beIPs []net.IP
|
|
bePorts []int
|
|
}
|
|
|
|
func newLoadBalancer(numberOfBackends int) (tss *testServers, cleanup func(), err error) {
|
|
var (
|
|
beListeners []net.Listener
|
|
ls *remoteBalancer
|
|
lb *grpc.Server
|
|
beIPs []net.IP
|
|
bePorts []int
|
|
)
|
|
for i := 0; i < numberOfBackends; i++ {
|
|
// Start a backend.
|
|
beLis, e := net.Listen("tcp", "localhost:0")
|
|
if e != nil {
|
|
err = fmt.Errorf("Failed to listen %v", err)
|
|
return
|
|
}
|
|
beIPs = append(beIPs, beLis.Addr().(*net.TCPAddr).IP)
|
|
bePorts = append(bePorts, beLis.Addr().(*net.TCPAddr).Port)
|
|
|
|
beListeners = append(beListeners, beLis)
|
|
}
|
|
backends := startBackends(besn, beListeners...)
|
|
|
|
// Start a load balancer.
|
|
lbLis, err := net.Listen("tcp", "localhost:0")
|
|
if err != nil {
|
|
err = fmt.Errorf("Failed to create the listener for the load balancer %v", err)
|
|
return
|
|
}
|
|
lbCreds := &serverNameCheckCreds{
|
|
sn: lbsn,
|
|
}
|
|
lb = grpc.NewServer(grpc.Creds(lbCreds))
|
|
if err != nil {
|
|
err = fmt.Errorf("Failed to generate the port number %v", err)
|
|
return
|
|
}
|
|
ls = newRemoteBalancer(nil, nil)
|
|
lbspb.RegisterLoadBalancerServer(lb, ls)
|
|
go func() {
|
|
lb.Serve(lbLis)
|
|
}()
|
|
|
|
tss = &testServers{
|
|
lbAddr: lbLis.Addr().String(),
|
|
ls: ls,
|
|
lb: lb,
|
|
beIPs: beIPs,
|
|
bePorts: bePorts,
|
|
}
|
|
cleanup = func() {
|
|
defer stopBackends(backends)
|
|
defer func() {
|
|
ls.stop()
|
|
lb.Stop()
|
|
}()
|
|
}
|
|
return
|
|
}
|
|
|
|
func TestGRPCLB(t *testing.T) {
|
|
tss, cleanup, err := newLoadBalancer(1)
|
|
if err != nil {
|
|
t.Fatalf("failed to create new load balancer: %v", err)
|
|
}
|
|
defer cleanup()
|
|
|
|
be := &lbmpb.Server{
|
|
IpAddress: tss.beIPs[0],
|
|
Port: int32(tss.bePorts[0]),
|
|
LoadBalanceToken: lbToken,
|
|
}
|
|
var bes []*lbmpb.Server
|
|
bes = append(bes, be)
|
|
sl := &lbmpb.ServerList{
|
|
Servers: bes,
|
|
}
|
|
tss.ls.sls = []*lbmpb.ServerList{sl}
|
|
tss.ls.intervals = []time.Duration{0}
|
|
creds := serverNameCheckCreds{
|
|
expected: besn,
|
|
}
|
|
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
|
defer cancel()
|
|
cc, err := grpc.DialContext(ctx, besn,
|
|
grpc.WithBalancer(grpc.NewGRPCLBBalancer(&testNameResolver{addrs: []string{tss.lbAddr}})),
|
|
grpc.WithBlock(), grpc.WithTransportCredentials(&creds), grpc.WithDialer(fakeNameDialer))
|
|
if err != nil {
|
|
t.Fatalf("Failed to dial to the backend %v", err)
|
|
}
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
cc.Close()
|
|
}
|
|
|
|
func TestDropRequest(t *testing.T) {
|
|
tss, cleanup, err := newLoadBalancer(2)
|
|
if err != nil {
|
|
t.Fatalf("failed to create new load balancer: %v", err)
|
|
}
|
|
defer cleanup()
|
|
tss.ls.sls = []*lbmpb.ServerList{{
|
|
Servers: []*lbmpb.Server{{
|
|
IpAddress: tss.beIPs[0],
|
|
Port: int32(tss.bePorts[0]),
|
|
LoadBalanceToken: lbToken,
|
|
DropForLoadBalancing: true,
|
|
}, {
|
|
IpAddress: tss.beIPs[1],
|
|
Port: int32(tss.bePorts[1]),
|
|
LoadBalanceToken: lbToken,
|
|
DropForLoadBalancing: false,
|
|
}},
|
|
}}
|
|
tss.ls.intervals = []time.Duration{0}
|
|
creds := serverNameCheckCreds{
|
|
expected: besn,
|
|
}
|
|
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
|
defer cancel()
|
|
cc, err := grpc.DialContext(ctx, besn,
|
|
grpc.WithBalancer(grpc.NewGRPCLBBalancer(&testNameResolver{addrs: []string{tss.lbAddr}})),
|
|
grpc.WithBlock(), grpc.WithTransportCredentials(&creds), grpc.WithDialer(fakeNameDialer))
|
|
if err != nil {
|
|
t.Fatalf("Failed to dial to the backend %v", err)
|
|
}
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
// The 1st, non-fail-fast RPC should succeed. This ensures both server
|
|
// connections are made, because the first one has DropForLoadBalancing set to true.
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.FailFast(false)); err != nil {
|
|
t.Fatalf("%v.SayHello(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
for i := 0; i < 3; i++ {
|
|
// Odd fail-fast RPCs should fail, because the 1st backend has DropForLoadBalancing
|
|
// set to true.
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); grpc.Code(err) != codes.Unavailable {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, %s", testC, err, codes.Unavailable)
|
|
}
|
|
// Even fail-fast RPCs should succeed since they choose the
|
|
// non-drop-request backend according to the round robin policy.
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
}
|
|
cc.Close()
|
|
}
|
|
|
|
func TestDropRequestFailedNonFailFast(t *testing.T) {
|
|
tss, cleanup, err := newLoadBalancer(1)
|
|
if err != nil {
|
|
t.Fatalf("failed to create new load balancer: %v", err)
|
|
}
|
|
defer cleanup()
|
|
be := &lbmpb.Server{
|
|
IpAddress: tss.beIPs[0],
|
|
Port: int32(tss.bePorts[0]),
|
|
LoadBalanceToken: lbToken,
|
|
DropForLoadBalancing: true,
|
|
}
|
|
var bes []*lbmpb.Server
|
|
bes = append(bes, be)
|
|
sl := &lbmpb.ServerList{
|
|
Servers: bes,
|
|
}
|
|
tss.ls.sls = []*lbmpb.ServerList{sl}
|
|
tss.ls.intervals = []time.Duration{0}
|
|
creds := serverNameCheckCreds{
|
|
expected: besn,
|
|
}
|
|
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
|
defer cancel()
|
|
cc, err := grpc.DialContext(ctx, besn,
|
|
grpc.WithBalancer(grpc.NewGRPCLBBalancer(&testNameResolver{addrs: []string{tss.lbAddr}})),
|
|
grpc.WithBlock(), grpc.WithTransportCredentials(&creds), grpc.WithDialer(fakeNameDialer))
|
|
if err != nil {
|
|
t.Fatalf("Failed to dial to the backend %v", err)
|
|
}
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
ctx, cancel = context.WithTimeout(context.Background(), 10*time.Millisecond)
|
|
defer cancel()
|
|
if _, err := testC.EmptyCall(ctx, &testpb.Empty{}, grpc.FailFast(false)); grpc.Code(err) != codes.DeadlineExceeded {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, %s", testC, err, codes.DeadlineExceeded)
|
|
}
|
|
cc.Close()
|
|
}
|
|
|
|
// When the balancer in use disconnects, grpclb should connect to the next address from resolved balancer address list.
|
|
func TestBalancerDisconnects(t *testing.T) {
|
|
var (
|
|
lbAddrs []string
|
|
lbs []*grpc.Server
|
|
)
|
|
for i := 0; i < 3; i++ {
|
|
tss, cleanup, err := newLoadBalancer(1)
|
|
if err != nil {
|
|
t.Fatalf("failed to create new load balancer: %v", err)
|
|
}
|
|
defer cleanup()
|
|
|
|
be := &lbmpb.Server{
|
|
IpAddress: tss.beIPs[0],
|
|
Port: int32(tss.bePorts[0]),
|
|
LoadBalanceToken: lbToken,
|
|
}
|
|
var bes []*lbmpb.Server
|
|
bes = append(bes, be)
|
|
sl := &lbmpb.ServerList{
|
|
Servers: bes,
|
|
}
|
|
tss.ls.sls = []*lbmpb.ServerList{sl}
|
|
tss.ls.intervals = []time.Duration{0}
|
|
|
|
lbAddrs = append(lbAddrs, tss.lbAddr)
|
|
lbs = append(lbs, tss.lb)
|
|
}
|
|
|
|
creds := serverNameCheckCreds{
|
|
expected: besn,
|
|
}
|
|
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
|
defer cancel()
|
|
resolver := &testNameResolver{
|
|
addrs: lbAddrs[:2],
|
|
}
|
|
cc, err := grpc.DialContext(ctx, besn,
|
|
grpc.WithBalancer(grpc.NewGRPCLBBalancer(resolver)),
|
|
grpc.WithBlock(), grpc.WithTransportCredentials(&creds), grpc.WithDialer(fakeNameDialer))
|
|
if err != nil {
|
|
t.Fatalf("Failed to dial to the backend %v", err)
|
|
}
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
var previousTrailer string
|
|
trailer := metadata.MD{}
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Trailer(&trailer), grpc.FailFast(false)); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
} else {
|
|
previousTrailer = trailer[testmdkey][0]
|
|
}
|
|
// The initial resolver update contains lbs[0] and lbs[1].
|
|
// When lbs[0] is stopped, lbs[1] should be used.
|
|
lbs[0].Stop()
|
|
for {
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Trailer(&trailer), grpc.FailFast(false)); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
} else if trailer[testmdkey][0] != previousTrailer {
|
|
// A new backend server should receive the request.
|
|
// The trailer contains the backend address, so the trailer should be different from the previous one.
|
|
previousTrailer = trailer[testmdkey][0]
|
|
break
|
|
}
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
// Inject a update to add lbs[2] to resolved addresses.
|
|
resolver.inject([]*naming.Update{
|
|
{Op: naming.Add,
|
|
Addr: lbAddrs[2],
|
|
Metadata: &naming.AddrMetadataGRPCLB{
|
|
AddrType: naming.GRPCLB,
|
|
ServerName: lbsn,
|
|
},
|
|
},
|
|
})
|
|
// Stop lbs[1]. Now lbs[0] and lbs[1] are all stopped. lbs[2] should be used.
|
|
lbs[1].Stop()
|
|
for {
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.Trailer(&trailer), grpc.FailFast(false)); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
} else if trailer[testmdkey][0] != previousTrailer {
|
|
// A new backend server should receive the request.
|
|
// The trailer contains the backend address, so the trailer should be different from the previous one.
|
|
break
|
|
}
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
cc.Close()
|
|
}
|
|
|
|
type failPreRPCCred struct{}
|
|
|
|
func (failPreRPCCred) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
|
|
if strings.Contains(uri[0], "failtosend") {
|
|
return nil, fmt.Errorf("rpc should fail to send")
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
func (failPreRPCCred) RequireTransportSecurity() bool {
|
|
return false
|
|
}
|
|
|
|
func checkStats(stats *lbmpb.ClientStats, expected *lbmpb.ClientStats) error {
|
|
if !proto.Equal(stats, expected) {
|
|
return fmt.Errorf("stats not equal: got %+v, want %+v", stats, expected)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func runAndGetStats(t *testing.T, dropForLoadBalancing, dropForRateLimiting bool, runRPCs func(*grpc.ClientConn)) lbmpb.ClientStats {
|
|
tss, cleanup, err := newLoadBalancer(3)
|
|
if err != nil {
|
|
t.Fatalf("failed to create new load balancer: %v", err)
|
|
}
|
|
defer cleanup()
|
|
tss.ls.sls = []*lbmpb.ServerList{{
|
|
Servers: []*lbmpb.Server{{
|
|
IpAddress: tss.beIPs[2],
|
|
Port: int32(tss.bePorts[2]),
|
|
LoadBalanceToken: lbToken,
|
|
DropForLoadBalancing: dropForLoadBalancing,
|
|
DropForRateLimiting: dropForRateLimiting,
|
|
}},
|
|
}}
|
|
tss.ls.intervals = []time.Duration{0}
|
|
tss.ls.statsDura = 100 * time.Millisecond
|
|
creds := serverNameCheckCreds{expected: besn}
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
|
defer cancel()
|
|
cc, err := grpc.DialContext(ctx, besn,
|
|
grpc.WithBalancer(grpc.NewGRPCLBBalancer(&testNameResolver{addrs: []string{tss.lbAddr}})),
|
|
grpc.WithTransportCredentials(&creds), grpc.WithPerRPCCredentials(failPreRPCCred{}),
|
|
grpc.WithBlock(), grpc.WithDialer(fakeNameDialer))
|
|
if err != nil {
|
|
t.Fatalf("Failed to dial to the backend %v", err)
|
|
}
|
|
defer cc.Close()
|
|
|
|
runRPCs(cc)
|
|
time.Sleep(1 * time.Second)
|
|
tss.ls.mu.Lock()
|
|
stats := tss.ls.stats
|
|
tss.ls.mu.Unlock()
|
|
return stats
|
|
}
|
|
|
|
const countRPC = 40
|
|
|
|
func TestGRPCLBStatsUnarySuccess(t *testing.T) {
|
|
stats := runAndGetStats(t, false, false, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
// The first non-failfast RPC succeeds, all connections are up.
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.FailFast(false)); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
for i := 0; i < countRPC-1; i++ {
|
|
testC.EmptyCall(context.Background(), &testpb.Empty{})
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC),
|
|
NumCallsFinished: int64(countRPC),
|
|
NumCallsFinishedKnownReceived: int64(countRPC),
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsUnaryDropLoadBalancing(t *testing.T) {
|
|
c := 0
|
|
stats := runAndGetStats(t, true, false, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
for {
|
|
c++
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
|
|
if strings.Contains(err.Error(), "drops requests") {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
for i := 0; i < countRPC; i++ {
|
|
testC.EmptyCall(context.Background(), &testpb.Empty{})
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC + c),
|
|
NumCallsFinished: int64(countRPC + c),
|
|
NumCallsFinishedWithDropForLoadBalancing: int64(countRPC + 1),
|
|
NumCallsFinishedWithClientFailedToSend: int64(c - 1),
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsUnaryDropRateLimiting(t *testing.T) {
|
|
c := 0
|
|
stats := runAndGetStats(t, false, true, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
for {
|
|
c++
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
|
|
if strings.Contains(err.Error(), "drops requests") {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
for i := 0; i < countRPC; i++ {
|
|
testC.EmptyCall(context.Background(), &testpb.Empty{})
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC + c),
|
|
NumCallsFinished: int64(countRPC + c),
|
|
NumCallsFinishedWithDropForRateLimiting: int64(countRPC + 1),
|
|
NumCallsFinishedWithClientFailedToSend: int64(c - 1),
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsUnaryFailedToSend(t *testing.T) {
|
|
stats := runAndGetStats(t, false, false, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
// The first non-failfast RPC succeeds, all connections are up.
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}, grpc.FailFast(false)); err != nil {
|
|
t.Fatalf("%v.EmptyCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
for i := 0; i < countRPC-1; i++ {
|
|
grpc.Invoke(context.Background(), "failtosend", &testpb.Empty{}, nil, cc)
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC),
|
|
NumCallsFinished: int64(countRPC),
|
|
NumCallsFinishedWithClientFailedToSend: int64(countRPC - 1),
|
|
NumCallsFinishedKnownReceived: 1,
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsStreamingSuccess(t *testing.T) {
|
|
stats := runAndGetStats(t, false, false, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
// The first non-failfast RPC succeeds, all connections are up.
|
|
stream, err := testC.FullDuplexCall(context.Background(), grpc.FailFast(false))
|
|
if err != nil {
|
|
t.Fatalf("%v.FullDuplexCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
for {
|
|
if _, err = stream.Recv(); err == io.EOF {
|
|
break
|
|
}
|
|
}
|
|
for i := 0; i < countRPC-1; i++ {
|
|
stream, err = testC.FullDuplexCall(context.Background())
|
|
if err == nil {
|
|
// Wait for stream to end if err is nil.
|
|
for {
|
|
if _, err = stream.Recv(); err == io.EOF {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC),
|
|
NumCallsFinished: int64(countRPC),
|
|
NumCallsFinishedKnownReceived: int64(countRPC),
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsStreamingDropLoadBalancing(t *testing.T) {
|
|
c := 0
|
|
stats := runAndGetStats(t, true, false, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
for {
|
|
c++
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
|
|
if strings.Contains(err.Error(), "drops requests") {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
for i := 0; i < countRPC; i++ {
|
|
testC.FullDuplexCall(context.Background())
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC + c),
|
|
NumCallsFinished: int64(countRPC + c),
|
|
NumCallsFinishedWithDropForLoadBalancing: int64(countRPC + 1),
|
|
NumCallsFinishedWithClientFailedToSend: int64(c - 1),
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsStreamingDropRateLimiting(t *testing.T) {
|
|
c := 0
|
|
stats := runAndGetStats(t, false, true, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
for {
|
|
c++
|
|
if _, err := testC.EmptyCall(context.Background(), &testpb.Empty{}); err != nil {
|
|
if strings.Contains(err.Error(), "drops requests") {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
for i := 0; i < countRPC; i++ {
|
|
testC.FullDuplexCall(context.Background())
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC + c),
|
|
NumCallsFinished: int64(countRPC + c),
|
|
NumCallsFinishedWithDropForRateLimiting: int64(countRPC + 1),
|
|
NumCallsFinishedWithClientFailedToSend: int64(c - 1),
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestGRPCLBStatsStreamingFailedToSend(t *testing.T) {
|
|
stats := runAndGetStats(t, false, false, func(cc *grpc.ClientConn) {
|
|
testC := testpb.NewTestServiceClient(cc)
|
|
// The first non-failfast RPC succeeds, all connections are up.
|
|
stream, err := testC.FullDuplexCall(context.Background(), grpc.FailFast(false))
|
|
if err != nil {
|
|
t.Fatalf("%v.FullDuplexCall(_, _) = _, %v, want _, <nil>", testC, err)
|
|
}
|
|
for {
|
|
if _, err = stream.Recv(); err == io.EOF {
|
|
break
|
|
}
|
|
}
|
|
for i := 0; i < countRPC-1; i++ {
|
|
grpc.NewClientStream(context.Background(), &grpc.StreamDesc{}, cc, "failtosend")
|
|
}
|
|
})
|
|
|
|
if err := checkStats(&stats, &lbmpb.ClientStats{
|
|
NumCallsStarted: int64(countRPC),
|
|
NumCallsFinished: int64(countRPC),
|
|
NumCallsFinishedWithClientFailedToSend: int64(countRPC - 1),
|
|
NumCallsFinishedKnownReceived: 1,
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|