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clientconn_test.go
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clientconn_test.go
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/*
*
* Copyright 2014 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.
*
*/
package grpc
import (
"math"
"net"
"sync/atomic"
"testing"
"time"
"golang.org/x/net/context"
"golang.org/x/net/http2"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/internal/backoff"
"google.golang.org/grpc/internal/leakcheck"
"google.golang.org/grpc/keepalive"
"google.golang.org/grpc/naming"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/resolver/manual"
_ "google.golang.org/grpc/resolver/passthrough"
"google.golang.org/grpc/testdata"
)
var (
mutableMinConnectTimeout = time.Second * 20
)
func init() {
getMinConnectTimeout = func() time.Duration {
return time.Duration(atomic.LoadInt64((*int64)(&mutableMinConnectTimeout)))
}
}
func assertState(wantState connectivity.State, cc *ClientConn) (connectivity.State, bool) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
var state connectivity.State
for state = cc.GetState(); state != wantState && cc.WaitForStateChange(ctx, state); state = cc.GetState() {
}
return state, state == wantState
}
func TestDialWithMultipleBackendsNotSendingServerPreface(t *testing.T) {
defer leakcheck.Check(t)
numServers := 2
servers := make([]net.Listener, numServers)
var err error
for i := 0; i < numServers; i++ {
servers[i], err = net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Error while listening. Err: %v", err)
}
}
dones := make([]chan struct{}, numServers)
for i := 0; i < numServers; i++ {
dones[i] = make(chan struct{})
}
for i := 0; i < numServers; i++ {
go func(i int) {
defer func() {
close(dones[i])
}()
conn, err := servers[i].Accept()
if err != nil {
t.Errorf("Error while accepting. Err: %v", err)
return
}
defer conn.Close()
switch i {
case 0: // 1st server accepts the connection and immediately closes it.
case 1: // 2nd server accepts the connection and sends settings frames.
framer := http2.NewFramer(conn, conn)
if err := framer.WriteSettings(http2.Setting{}); err != nil {
t.Errorf("Error while writing settings frame. %v", err)
return
}
conn.SetDeadline(time.Now().Add(time.Second))
buf := make([]byte, 1024)
for { // Make sure the connection stays healthy.
_, err = conn.Read(buf)
if err == nil {
continue
}
if nerr, ok := err.(net.Error); !ok || !nerr.Timeout() {
t.Errorf("Server expected the conn.Read(_) to timeout instead got error: %v", err)
}
return
}
}
}(i)
}
r, cleanup := manual.GenerateAndRegisterManualResolver()
defer cleanup()
resolvedAddrs := make([]resolver.Address, numServers)
for i := 0; i < numServers; i++ {
resolvedAddrs[i] = resolver.Address{Addr: servers[i].Addr().String()}
}
r.InitialAddrs(resolvedAddrs)
client, err := Dial(r.Scheme()+":///test.server", WithInsecure())
if err != nil {
t.Errorf("Dial failed. Err: %v", err)
} else {
defer client.Close()
}
time.Sleep(time.Second) // Close the servers after a second for cleanup.
for _, s := range servers {
s.Close()
}
for _, done := range dones {
<-done
}
}
func TestDialWaitsForServerSettings(t *testing.T) {
defer leakcheck.Check(t)
server, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Error while listening. Err: %v", err)
}
defer server.Close()
done := make(chan struct{})
sent := make(chan struct{})
dialDone := make(chan struct{})
go func() { // Launch the server.
defer func() {
close(done)
}()
conn, err := server.Accept()
if err != nil {
t.Errorf("Error while accepting. Err: %v", err)
return
}
defer conn.Close()
// Sleep for a little bit to make sure that Dial on client
// side blocks until settings are received.
time.Sleep(500 * time.Millisecond)
framer := http2.NewFramer(conn, conn)
close(sent)
if err := framer.WriteSettings(http2.Setting{}); err != nil {
t.Errorf("Error while writing settings. Err: %v", err)
return
}
<-dialDone // Close conn only after dial returns.
}()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
client, err := DialContext(ctx, server.Addr().String(), WithInsecure(), WithWaitForHandshake(), WithBlock())
close(dialDone)
if err != nil {
cancel()
t.Fatalf("Error while dialing. Err: %v", err)
}
defer client.Close()
select {
case <-sent:
default:
t.Fatalf("Dial returned before server settings were sent")
}
<-done
}
func TestCloseConnectionWhenServerPrefaceNotReceived(t *testing.T) {
// 1. Client connects to a server that doesn't send preface.
// 2. After minConnectTimeout(500 ms here), client disconnects and retries.
// 3. The new server sends its preface.
// 4. Client doesn't kill the connection this time.
mctBkp := getMinConnectTimeout()
// Call this only after transportMonitor goroutine has ended.
defer func() {
atomic.StoreInt64((*int64)(&mutableMinConnectTimeout), int64(mctBkp))
}()
defer leakcheck.Check(t)
atomic.StoreInt64((*int64)(&mutableMinConnectTimeout), int64(time.Millisecond)*500)
lis, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Error while listening. Err: %v", err)
}
var (
conn2 net.Conn
over uint32
)
defer func() {
lis.Close()
// conn2 shouldn't be closed until the client has
// observed a successful test.
if conn2 != nil {
conn2.Close()
}
}()
done := make(chan struct{})
accepted := make(chan struct{})
go func() { // Launch the server.
defer close(done)
conn1, err := lis.Accept()
if err != nil {
t.Errorf("Error while accepting. Err: %v", err)
return
}
defer conn1.Close()
// Don't send server settings and the client should close the connection and try again.
conn2, err = lis.Accept() // Accept a reconnection request from client.
if err != nil {
t.Errorf("Error while accepting. Err: %v", err)
return
}
close(accepted)
framer := http2.NewFramer(conn2, conn2)
if err = framer.WriteSettings(http2.Setting{}); err != nil {
t.Errorf("Error while writing settings. Err: %v", err)
return
}
b := make([]byte, 8)
for {
_, err = conn2.Read(b)
if err == nil {
continue
}
if atomic.LoadUint32(&over) == 1 {
// The connection stayed alive for the timer.
// Success.
return
}
t.Errorf("Unexpected error while reading. Err: %v, want timeout error", err)
break
}
}()
client, err := Dial(lis.Addr().String(), WithInsecure())
if err != nil {
t.Fatalf("Error while dialing. Err: %v", err)
}
// wait for connection to be accepted on the server.
timer := time.NewTimer(time.Second * 10)
select {
case <-accepted:
case <-timer.C:
t.Fatalf("Client didn't make another connection request in time.")
}
// Make sure the connection stays alive for sometime.
time.Sleep(time.Second * 2)
atomic.StoreUint32(&over, 1)
client.Close()
<-done
}
func TestBackoffWhenNoServerPrefaceReceived(t *testing.T) {
defer leakcheck.Check(t)
server, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Error while listening. Err: %v", err)
}
defer server.Close()
done := make(chan struct{})
go func() { // Launch the server.
defer func() {
close(done)
}()
conn, err := server.Accept() // Accept the connection only to close it immediately.
if err != nil {
t.Errorf("Error while accepting. Err: %v", err)
return
}
prevAt := time.Now()
conn.Close()
var prevDuration time.Duration
// Make sure the retry attempts are backed off properly.
for i := 0; i < 3; i++ {
conn, err := server.Accept()
if err != nil {
t.Errorf("Error while accepting. Err: %v", err)
return
}
meow := time.Now()
conn.Close()
dr := meow.Sub(prevAt)
if dr <= prevDuration {
t.Errorf("Client backoff did not increase with retries. Previous duration: %v, current duration: %v", prevDuration, dr)
return
}
prevDuration = dr
prevAt = meow
}
}()
client, err := Dial(server.Addr().String(), WithInsecure())
if err != nil {
t.Fatalf("Error while dialing. Err: %v", err)
}
defer client.Close()
<-done
}
func TestConnectivityStates(t *testing.T) {
defer leakcheck.Check(t)
servers, resolver, cleanup := startServers(t, 2, math.MaxUint32)
defer cleanup()
cc, err := Dial("passthrough:///foo.bar.com", WithBalancer(RoundRobin(resolver)), WithInsecure())
if err != nil {
t.Fatalf("Dial(\"foo.bar.com\", WithBalancer(_)) = _, %v, want _ <nil>", err)
}
defer cc.Close()
wantState := connectivity.Ready
if state, ok := assertState(wantState, cc); !ok {
t.Fatalf("asserState(%s) = %s, false, want %s, true", wantState, state, wantState)
}
// Send an update to delete the server connection (tearDown addrConn).
update := []*naming.Update{
{
Op: naming.Delete,
Addr: "localhost:" + servers[0].port,
},
}
resolver.w.inject(update)
wantState = connectivity.TransientFailure
if state, ok := assertState(wantState, cc); !ok {
t.Fatalf("asserState(%s) = %s, false, want %s, true", wantState, state, wantState)
}
update[0] = &naming.Update{
Op: naming.Add,
Addr: "localhost:" + servers[1].port,
}
resolver.w.inject(update)
wantState = connectivity.Ready
if state, ok := assertState(wantState, cc); !ok {
t.Fatalf("asserState(%s) = %s, false, want %s, true", wantState, state, wantState)
}
}
func TestWithTimeout(t *testing.T) {
defer leakcheck.Check(t)
conn, err := Dial("passthrough:///Non-Existent.Server:80", WithTimeout(time.Millisecond), WithBlock(), WithInsecure())
if err == nil {
conn.Close()
}
if err != context.DeadlineExceeded {
t.Fatalf("Dial(_, _) = %v, %v, want %v", conn, err, context.DeadlineExceeded)
}
}
func TestWithTransportCredentialsTLS(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
defer cancel()
defer leakcheck.Check(t)
creds, err := credentials.NewClientTLSFromFile(testdata.Path("ca.pem"), "x.test.youtube.com")
if err != nil {
t.Fatalf("Failed to create credentials %v", err)
}
conn, err := DialContext(ctx, "passthrough:///Non-Existent.Server:80", WithTransportCredentials(creds), WithBlock())
if err == nil {
conn.Close()
}
if err != context.DeadlineExceeded {
t.Fatalf("Dial(_, _) = %v, %v, want %v", conn, err, context.DeadlineExceeded)
}
}
func TestDefaultAuthority(t *testing.T) {
defer leakcheck.Check(t)
target := "Non-Existent.Server:8080"
conn, err := Dial(target, WithInsecure())
if err != nil {
t.Fatalf("Dial(_, _) = _, %v, want _, <nil>", err)
}
defer conn.Close()
if conn.authority != target {
t.Fatalf("%v.authority = %v, want %v", conn, conn.authority, target)
}
}
func TestTLSServerNameOverwrite(t *testing.T) {
defer leakcheck.Check(t)
overwriteServerName := "over.write.server.name"
creds, err := credentials.NewClientTLSFromFile(testdata.Path("ca.pem"), overwriteServerName)
if err != nil {
t.Fatalf("Failed to create credentials %v", err)
}
conn, err := Dial("passthrough:///Non-Existent.Server:80", WithTransportCredentials(creds))
if err != nil {
t.Fatalf("Dial(_, _) = _, %v, want _, <nil>", err)
}
defer conn.Close()
if conn.authority != overwriteServerName {
t.Fatalf("%v.authority = %v, want %v", conn, conn.authority, overwriteServerName)
}
}
func TestWithAuthority(t *testing.T) {
defer leakcheck.Check(t)
overwriteServerName := "over.write.server.name"
conn, err := Dial("passthrough:///Non-Existent.Server:80", WithInsecure(), WithAuthority(overwriteServerName))
if err != nil {
t.Fatalf("Dial(_, _) = _, %v, want _, <nil>", err)
}
defer conn.Close()
if conn.authority != overwriteServerName {
t.Fatalf("%v.authority = %v, want %v", conn, conn.authority, overwriteServerName)
}
}
func TestWithAuthorityAndTLS(t *testing.T) {
defer leakcheck.Check(t)
overwriteServerName := "over.write.server.name"
creds, err := credentials.NewClientTLSFromFile(testdata.Path("ca.pem"), overwriteServerName)
if err != nil {
t.Fatalf("Failed to create credentials %v", err)
}
conn, err := Dial("passthrough:///Non-Existent.Server:80", WithTransportCredentials(creds), WithAuthority("no.effect.authority"))
if err != nil {
t.Fatalf("Dial(_, _) = _, %v, want _, <nil>", err)
}
defer conn.Close()
if conn.authority != overwriteServerName {
t.Fatalf("%v.authority = %v, want %v", conn, conn.authority, overwriteServerName)
}
}
func TestDialContextCancel(t *testing.T) {
defer leakcheck.Check(t)
ctx, cancel := context.WithCancel(context.Background())
cancel()
if _, err := DialContext(ctx, "Non-Existent.Server:80", WithBlock(), WithInsecure()); err != context.Canceled {
t.Fatalf("DialContext(%v, _) = _, %v, want _, %v", ctx, err, context.Canceled)
}
}
// blockingBalancer mimics the behavior of balancers whose initialization takes a long time.
// In this test, reading from blockingBalancer.Notify() blocks forever.
type blockingBalancer struct {
ch chan []Address
}
func newBlockingBalancer() Balancer {
return &blockingBalancer{ch: make(chan []Address)}
}
func (b *blockingBalancer) Start(target string, config BalancerConfig) error {
return nil
}
func (b *blockingBalancer) Up(addr Address) func(error) {
return nil
}
func (b *blockingBalancer) Get(ctx context.Context, opts BalancerGetOptions) (addr Address, put func(), err error) {
return Address{}, nil, nil
}
func (b *blockingBalancer) Notify() <-chan []Address {
return b.ch
}
func (b *blockingBalancer) Close() error {
close(b.ch)
return nil
}
func TestDialWithBlockingBalancer(t *testing.T) {
defer leakcheck.Check(t)
ctx, cancel := context.WithCancel(context.Background())
dialDone := make(chan struct{})
go func() {
DialContext(ctx, "Non-Existent.Server:80", WithBlock(), WithInsecure(), WithBalancer(newBlockingBalancer()))
close(dialDone)
}()
cancel()
<-dialDone
}
// securePerRPCCredentials always requires transport security.
type securePerRPCCredentials struct{}
func (c securePerRPCCredentials) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
return nil, nil
}
func (c securePerRPCCredentials) RequireTransportSecurity() bool {
return true
}
func TestCredentialsMisuse(t *testing.T) {
defer leakcheck.Check(t)
tlsCreds, err := credentials.NewClientTLSFromFile(testdata.Path("ca.pem"), "x.test.youtube.com")
if err != nil {
t.Fatalf("Failed to create authenticator %v", err)
}
// Two conflicting credential configurations
if _, err := Dial("passthrough:///Non-Existent.Server:80", WithTransportCredentials(tlsCreds), WithBlock(), WithInsecure()); err != errCredentialsConflict {
t.Fatalf("Dial(_, _) = _, %v, want _, %v", err, errCredentialsConflict)
}
// security info on insecure connection
if _, err := Dial("passthrough:///Non-Existent.Server:80", WithPerRPCCredentials(securePerRPCCredentials{}), WithBlock(), WithInsecure()); err != errTransportCredentialsMissing {
t.Fatalf("Dial(_, _) = _, %v, want _, %v", err, errTransportCredentialsMissing)
}
}
func TestWithBackoffConfigDefault(t *testing.T) {
defer leakcheck.Check(t)
testBackoffConfigSet(t, &DefaultBackoffConfig)
}
func TestWithBackoffConfig(t *testing.T) {
defer leakcheck.Check(t)
b := BackoffConfig{MaxDelay: DefaultBackoffConfig.MaxDelay / 2}
expected := b
testBackoffConfigSet(t, &expected, WithBackoffConfig(b))
}
func TestWithBackoffMaxDelay(t *testing.T) {
defer leakcheck.Check(t)
md := DefaultBackoffConfig.MaxDelay / 2
expected := BackoffConfig{MaxDelay: md}
testBackoffConfigSet(t, &expected, WithBackoffMaxDelay(md))
}
func testBackoffConfigSet(t *testing.T, expected *BackoffConfig, opts ...DialOption) {
opts = append(opts, WithInsecure())
conn, err := Dial("passthrough:///foo:80", opts...)
if err != nil {
t.Fatalf("unexpected error dialing connection: %v", err)
}
defer conn.Close()
if conn.dopts.bs == nil {
t.Fatalf("backoff config not set")
}
actual, ok := conn.dopts.bs.(backoff.Exponential)
if !ok {
t.Fatalf("unexpected type of backoff config: %#v", conn.dopts.bs)
}
expectedValue := backoff.Exponential{
MaxDelay: expected.MaxDelay,
}
if actual != expectedValue {
t.Fatalf("unexpected backoff config on connection: %v, want %v", actual, expected)
}
}
// emptyBalancer returns an empty set of servers.
type emptyBalancer struct {
ch chan []Address
}
func newEmptyBalancer() Balancer {
return &emptyBalancer{ch: make(chan []Address, 1)}
}
func (b *emptyBalancer) Start(_ string, _ BalancerConfig) error {
b.ch <- nil
return nil
}
func (b *emptyBalancer) Up(_ Address) func(error) {
return nil
}
func (b *emptyBalancer) Get(_ context.Context, _ BalancerGetOptions) (Address, func(), error) {
return Address{}, nil, nil
}
func (b *emptyBalancer) Notify() <-chan []Address {
return b.ch
}
func (b *emptyBalancer) Close() error {
close(b.ch)
return nil
}
func TestNonblockingDialWithEmptyBalancer(t *testing.T) {
defer leakcheck.Check(t)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
dialDone := make(chan error)
go func() {
dialDone <- func() error {
conn, err := DialContext(ctx, "Non-Existent.Server:80", WithInsecure(), WithBalancer(newEmptyBalancer()))
if err != nil {
return err
}
return conn.Close()
}()
}()
if err := <-dialDone; err != nil {
t.Fatalf("unexpected error dialing connection: %s", err)
}
}
func TestResolverServiceConfigBeforeAddressNotPanic(t *testing.T) {
defer leakcheck.Check(t)
r, rcleanup := manual.GenerateAndRegisterManualResolver()
defer rcleanup()
cc, err := Dial(r.Scheme()+":///test.server", WithInsecure())
if err != nil {
t.Fatalf("failed to dial: %v", err)
}
defer cc.Close()
// SwitchBalancer before NewAddress. There was no balancer created, this
// makes sure we don't call close on nil balancerWrapper.
r.NewServiceConfig(`{"loadBalancingPolicy": "round_robin"}`) // This should not panic.
time.Sleep(time.Second) // Sleep to make sure the service config is handled by ClientConn.
}
func TestResolverEmptyUpdateNotPanic(t *testing.T) {
defer leakcheck.Check(t)
r, rcleanup := manual.GenerateAndRegisterManualResolver()
defer rcleanup()
cc, err := Dial(r.Scheme()+":///test.server", WithInsecure())
if err != nil {
t.Fatalf("failed to dial: %v", err)
}
defer cc.Close()
// This make sure we don't create addrConn with empty address list.
r.NewAddress([]resolver.Address{}) // This should not panic.
time.Sleep(time.Second) // Sleep to make sure the service config is handled by ClientConn.
}
func TestClientUpdatesParamsAfterGoAway(t *testing.T) {
defer leakcheck.Check(t)
lis, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("Failed to listen. Err: %v", err)
}
defer lis.Close()
addr := lis.Addr().String()
s := NewServer()
go s.Serve(lis)
defer s.Stop()
cc, err := Dial(addr, WithBlock(), WithInsecure(), WithKeepaliveParams(keepalive.ClientParameters{
Time: 50 * time.Millisecond,
Timeout: 100 * time.Millisecond,
PermitWithoutStream: true,
}))
if err != nil {
t.Fatalf("Dial(%s, _) = _, %v, want _, <nil>", addr, err)
}
defer cc.Close()
time.Sleep(1 * time.Second)
cc.mu.RLock()
defer cc.mu.RUnlock()
v := cc.mkp.Time
if v < 100*time.Millisecond {
t.Fatalf("cc.dopts.copts.Keepalive.Time = %v , want 100ms", v)
}
}
func TestDisableServiceConfigOption(t *testing.T) {
r, cleanup := manual.GenerateAndRegisterManualResolver()
defer cleanup()
addr := r.Scheme() + ":///non.existent"
cc, err := Dial(addr, WithInsecure(), WithDisableServiceConfig())
if err != nil {
t.Fatalf("Dial(%s, _) = _, %v, want _, <nil>", addr, err)
}
defer cc.Close()
r.NewServiceConfig(`{
"methodConfig": [
{
"name": [
{
"service": "foo",
"method": "Bar"
}
],
"waitForReady": true
}
]
}`)
time.Sleep(1 * time.Second)
m := cc.GetMethodConfig("/foo/Bar")
if m.WaitForReady != nil {
t.Fatalf("want: method (\"/foo/bar/\") config to be empty, got: %v", m)
}
}
func TestGetClientConnTarget(t *testing.T) {
addr := "nonexist:///non.existent"
cc, err := Dial(addr, WithInsecure())
if err != nil {
t.Fatalf("Dial(%s, _) = _, %v, want _, <nil>", addr, err)
}
defer cc.Close()
if cc.Target() != addr {
t.Fatalf("Target() = %s, want %s", cc.Target(), addr)
}
}