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

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/*
*
* 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)
}
}