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idle_e2e_test.go
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idle_e2e_test.go
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/*
*
* Copyright 2023 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
*
* https://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 idle_test
import (
"context"
"errors"
"fmt"
"io"
"strings"
"testing"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/internal/channelz"
"google.golang.org/grpc/internal/grpctest"
"google.golang.org/grpc/internal/stubserver"
"google.golang.org/grpc/internal/testutils"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/resolver/manual"
"google.golang.org/grpc/status"
testgrpc "google.golang.org/grpc/interop/grpc_testing"
testpb "google.golang.org/grpc/interop/grpc_testing"
)
func init() {
channelz.TurnOn()
}
type s struct {
grpctest.Tester
}
func Test(t *testing.T) {
grpctest.RunSubTests(t, s{})
}
const (
defaultTestTimeout = 10 * time.Second
defaultTestShortTimeout = 100 * time.Millisecond
defaultTestShortIdleTimeout = 500 * time.Millisecond
)
// channelzTraceEventFound looks up the top-channels in channelz (expects a
// single one), and checks if there is a trace event on the channel matching the
// provided description string.
func channelzTraceEventFound(ctx context.Context, wantDesc string) error {
for ctx.Err() == nil {
tcs, _ := channelz.GetTopChannels(0, 0)
if l := len(tcs); l != 1 {
return fmt.Errorf("when looking for channelz trace event with description %q, found %d top-level channels, want 1", wantDesc, l)
}
if tcs[0].Trace == nil {
return fmt.Errorf("when looking for channelz trace event with description %q, no trace events found for top-level channel", wantDesc)
}
for _, e := range tcs[0].Trace.Events {
if strings.Contains(e.Desc, wantDesc) {
return nil
}
}
}
return fmt.Errorf("when looking for channelz trace event with description %q, %w", wantDesc, ctx.Err())
}
// channelzTraceEventNotFound looks up the top-channels in channelz (expects a
// single one), and verifies that there is no trace event on the channel
// matching the provided description string.
func channelzTraceEventNotFound(ctx context.Context, wantDesc string) error {
sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
defer sCancel()
err := channelzTraceEventFound(sCtx, wantDesc)
if err == nil {
return fmt.Errorf("found channelz trace event with description %q, when expected not to", wantDesc)
}
if !errors.Is(err, context.DeadlineExceeded) {
return err
}
return nil
}
// Tests the case where channel idleness is disabled by passing an idle_timeout
// of 0. Verifies that a READY channel with no RPCs does not move to IDLE.
func (s) TestChannelIdleness_Disabled_NoActivity(t *testing.T) {
// Create a ClientConn with idle_timeout set to 0.
r := manual.NewBuilderWithScheme("whatever")
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(0), // Disable idleness.
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Start a test backend and push an address update via the resolver.
backend := stubserver.StartTestService(t, nil)
t.Cleanup(backend.Stop)
r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Verify that the ClientConn moves to READY.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
// Verify that the ClientConn stay in READY.
sCtx, sCancel := context.WithTimeout(ctx, 3*defaultTestShortIdleTimeout)
defer sCancel()
testutils.AwaitNoStateChange(sCtx, t, cc, connectivity.Ready)
// Verify that there are no idleness related channelz events.
if err := channelzTraceEventNotFound(ctx, "entering idle mode"); err != nil {
t.Fatal(err)
}
if err := channelzTraceEventNotFound(ctx, "exiting idle mode"); err != nil {
t.Fatal(err)
}
}
// Tests the case where channel idleness is enabled by passing a small value for
// idle_timeout. Verifies that a READY channel with no RPCs moves to IDLE, and
// the connection to the backend is closed.
func (s) TestChannelIdleness_Enabled_NoActivity(t *testing.T) {
// Create a ClientConn with a short idle_timeout.
r := manual.NewBuilderWithScheme("whatever")
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Start a test backend and push an address update via the resolver.
lis := testutils.NewListenerWrapper(t, nil)
backend := stubserver.StartTestService(t, &stubserver.StubServer{Listener: lis})
t.Cleanup(backend.Stop)
r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Verify that the ClientConn moves to READY.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
// Retrieve the wrapped conn from the listener.
v, err := lis.NewConnCh.Receive(ctx)
if err != nil {
t.Fatalf("Failed to retrieve conn from test listener: %v", err)
}
conn := v.(*testutils.ConnWrapper)
// Verify that the ClientConn moves to IDLE as there is no activity.
testutils.AwaitState(ctx, t, cc, connectivity.Idle)
// Verify idleness related channelz events.
if err := channelzTraceEventFound(ctx, "entering idle mode"); err != nil {
t.Fatal(err)
}
// Verify that the previously open connection is closed.
if _, err := conn.CloseCh.Receive(ctx); err != nil {
t.Fatalf("Failed when waiting for connection to be closed after channel entered IDLE: %v", err)
}
}
// Tests the case where channel idleness is enabled by passing a small value for
// idle_timeout. Verifies that a READY channel with an ongoing RPC stays READY.
func (s) TestChannelIdleness_Enabled_OngoingCall(t *testing.T) {
tests := []struct {
name string
makeRPC func(ctx context.Context, client testgrpc.TestServiceClient) error
}{
{
name: "unary",
makeRPC: func(ctx context.Context, client testgrpc.TestServiceClient) error {
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
return fmt.Errorf("EmptyCall RPC failed: %v", err)
}
return nil
},
},
{
name: "streaming",
makeRPC: func(ctx context.Context, client testgrpc.TestServiceClient) error {
stream, err := client.FullDuplexCall(ctx)
if err != nil {
t.Fatalf("FullDuplexCall RPC failed: %v", err)
}
if _, err := stream.Recv(); err != nil && err != io.EOF {
t.Fatalf("stream.Recv() failed: %v", err)
}
return nil
},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
// Create a ClientConn with a short idle_timeout.
r := manual.NewBuilderWithScheme("whatever")
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Start a test backend which keeps a unary RPC call active by blocking on a
// channel that is closed by the test later on. Also push an address update
// via the resolver.
blockCh := make(chan struct{})
backend := &stubserver.StubServer{
EmptyCallF: func(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) {
<-blockCh
return &testpb.Empty{}, nil
},
FullDuplexCallF: func(stream testgrpc.TestService_FullDuplexCallServer) error {
<-blockCh
return nil
},
}
if err := backend.StartServer(); err != nil {
t.Fatalf("Failed to start backend: %v", err)
}
t.Cleanup(backend.Stop)
r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Verify that the ClientConn moves to READY.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
// Spawn a goroutine which checks expected state transitions and idleness
// channelz trace events.
errCh := make(chan error, 1)
go func() {
defer close(blockCh)
// Verify that the ClientConn stays in READY.
sCtx, sCancel := context.WithTimeout(ctx, 3*defaultTestShortIdleTimeout)
defer sCancel()
if cc.WaitForStateChange(sCtx, connectivity.Ready) {
errCh <- fmt.Errorf("state changed from %q to %q when no state change was expected", connectivity.Ready, cc.GetState())
return
}
// Verify that there are no idleness related channelz events.
//
// TODO: Improve the checks here. If these log strings are
// changed in the code, these checks will continue to pass.
if err := channelzTraceEventNotFound(ctx, "entering idle mode"); err != nil {
errCh <- err
return
}
errCh <- channelzTraceEventNotFound(ctx, "exiting idle mode")
}()
if err := test.makeRPC(ctx, testgrpc.NewTestServiceClient(cc)); err != nil {
t.Fatalf("%s rpc failed: %v", test.name, err)
}
select {
case err := <-errCh:
if err != nil {
t.Fatal(err)
}
case <-ctx.Done():
t.Fatalf("Timeout when trying to verify that an active RPC keeps channel from moving to IDLE")
}
})
}
}
// Tests the case where channel idleness is enabled by passing a small value for
// idle_timeout. Verifies that activity on a READY channel (frequent and short
// RPCs) keeps it from moving to IDLE.
func (s) TestChannelIdleness_Enabled_ActiveSinceLastCheck(t *testing.T) {
// Create a ClientConn with a short idle_timeout.
r := manual.NewBuilderWithScheme("whatever")
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Start a test backend and push an address update via the resolver.
backend := stubserver.StartTestService(t, nil)
t.Cleanup(backend.Stop)
r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Verify that the ClientConn moves to READY.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
// For a duration of three times the configured idle timeout, making RPCs
// every now and then and ensure that the channel does not move out of
// READY.
sCtx, sCancel := context.WithTimeout(ctx, 3*defaultTestShortIdleTimeout)
defer sCancel()
go func() {
for ; sCtx.Err() == nil; <-time.After(defaultTestShortIdleTimeout / 4) {
client := testgrpc.NewTestServiceClient(cc)
if _, err := client.EmptyCall(sCtx, &testpb.Empty{}); err != nil {
// While iterating through this for loop, at some point in time,
// the context deadline will expire. It is safe to ignore that
// error code.
if status.Code(err) != codes.DeadlineExceeded {
t.Errorf("EmptyCall RPC failed: %v", err)
return
}
}
}
}()
// Verify that the ClientConn stay in READY.
testutils.AwaitNoStateChange(sCtx, t, cc, connectivity.Ready)
// Verify that there are no idleness related channelz events.
if err := channelzTraceEventNotFound(ctx, "entering idle mode"); err != nil {
t.Fatal(err)
}
if err := channelzTraceEventNotFound(ctx, "exiting idle mode"); err != nil {
t.Fatal(err)
}
}
// Tests the case where channel idleness is enabled by passing a small value for
// idle_timeout. Verifies that a READY channel with no RPCs moves to IDLE. Also
// verifies that a subsequent RPC on the IDLE channel kicks it out of IDLE.
func (s) TestChannelIdleness_Enabled_ExitIdleOnRPC(t *testing.T) {
// Start a test backend and set the bootstrap state of the resolver to
// include this address. This will ensure that when the resolver is
// restarted when exiting idle, it will push the same address to grpc again.
r := manual.NewBuilderWithScheme("whatever")
backend := stubserver.StartTestService(t, nil)
t.Cleanup(backend.Stop)
r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Create a ClientConn with a short idle_timeout.
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Verify that the ClientConn moves to READY.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
// Verify that the ClientConn moves to IDLE as there is no activity.
testutils.AwaitState(ctx, t, cc, connectivity.Idle)
// Verify idleness related channelz events.
if err := channelzTraceEventFound(ctx, "entering idle mode"); err != nil {
t.Fatal(err)
}
// Make an RPC and ensure that it succeeds and moves the channel back to
// READY.
client := testgrpc.NewTestServiceClient(cc)
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
t.Fatalf("EmptyCall RPC failed: %v", err)
}
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
if err := channelzTraceEventFound(ctx, "exiting idle mode"); err != nil {
t.Fatal(err)
}
}
// Tests the case where channel idleness is enabled by passing a small value for
// idle_timeout. Simulates a race between the idle timer firing and RPCs being
// initiated, after a period of inactivity on the channel.
//
// After a period of inactivity (for the configured idle timeout duration), when
// RPCs are started, there are two possibilities:
// - the idle timer wins the race and puts the channel in idle. The RPCs then
// kick it out of idle.
// - the RPCs win the race, and therefore the channel never moves to idle.
//
// In either of these cases, all RPCs must succeed.
func (s) TestChannelIdleness_Enabled_IdleTimeoutRacesWithRPCs(t *testing.T) {
// Start a test backend and set the bootstrap state of the resolver to
// include this address. This will ensure that when the resolver is
// restarted when exiting idle, it will push the same address to grpc again.
r := manual.NewBuilderWithScheme("whatever")
backend := stubserver.StartTestService(t, nil)
t.Cleanup(backend.Stop)
r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Create a ClientConn with a short idle_timeout.
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(defaultTestShortTimeout),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Verify that the ClientConn moves to READY.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
client := testgrpc.NewTestServiceClient(cc)
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
t.Errorf("EmptyCall RPC failed: %v", err)
}
// Make an RPC every defaultTestShortTimeout duration so as to race with the
// idle timeout. Whether the idle timeout wins the race or the RPC wins the
// race, RPCs must succeed.
for i := 0; i < 20; i++ {
<-time.After(defaultTestShortTimeout)
if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
t.Fatalf("EmptyCall RPC failed: %v", err)
}
t.Logf("Iteration %d succeeded", i)
}
}
// Tests the case where the channel is IDLE and we call cc.Connect.
func (s) TestChannelIdleness_Connect(t *testing.T) {
// Start a test backend and set the bootstrap state of the resolver to
// include this address. This will ensure that when the resolver is
// restarted when exiting idle, it will push the same address to grpc again.
r := manual.NewBuilderWithScheme("whatever")
backend := stubserver.StartTestService(t, nil)
t.Cleanup(backend.Stop)
r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
// Create a ClientConn with a short idle_timeout.
dopts := []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithResolvers(r),
grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
}
cc, err := grpc.Dial(r.Scheme()+":https:///test.server", dopts...)
if err != nil {
t.Fatalf("grpc.Dial() failed: %v", err)
}
t.Cleanup(func() { cc.Close() })
// Verify that the ClientConn moves to IDLE.
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
testutils.AwaitState(ctx, t, cc, connectivity.Idle)
// Connect should exit channel idleness.
cc.Connect()
// Verify that the ClientConn moves back to READY.
testutils.AwaitState(ctx, t, cc, connectivity.Ready)
}