mirror of https://github.com/grpc/grpc-go.git
463 lines
17 KiB
Go
463 lines
17 KiB
Go
/*
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*
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* Copyright 2023 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package test
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"testing"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/internal/channelz"
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"google.golang.org/grpc/internal/stubserver"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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"google.golang.org/grpc/status"
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testgrpc "google.golang.org/grpc/interop/grpc_testing"
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testpb "google.golang.org/grpc/interop/grpc_testing"
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)
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const defaultTestShortIdleTimeout = 500 * time.Millisecond
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// channelzTraceEventFound looks up the top-channels in channelz (expects a
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// single one), and checks if there is a trace event on the channel matching the
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// provided description string.
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func channelzTraceEventFound(ctx context.Context, wantDesc string) error {
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for ctx.Err() == nil {
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tcs, _ := channelz.GetTopChannels(0, 0)
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if l := len(tcs); l != 1 {
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return fmt.Errorf("when looking for channelz trace event with description %q, found %d top-level channels, want 1", wantDesc, l)
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}
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if tcs[0].Trace == nil {
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return fmt.Errorf("when looking for channelz trace event with description %q, no trace events found for top-level channel", wantDesc)
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}
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for _, e := range tcs[0].Trace.Events {
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if strings.Contains(e.Desc, wantDesc) {
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return nil
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}
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}
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}
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return fmt.Errorf("when looking for channelz trace event with description %q, %w", wantDesc, ctx.Err())
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}
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// channelzTraceEventNotFound looks up the top-channels in channelz (expects a
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// single one), and verifies that there is no trace event on the channel
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// matching the provided description string.
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func channelzTraceEventNotFound(ctx context.Context, wantDesc string) error {
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sCtx, sCancel := context.WithTimeout(ctx, defaultTestShortTimeout)
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defer sCancel()
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err := channelzTraceEventFound(sCtx, wantDesc)
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if err == nil {
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return fmt.Errorf("found channelz trace event with description %q, when expected not to", wantDesc)
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}
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if !errors.Is(err, context.DeadlineExceeded) {
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return err
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}
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return nil
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}
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// Tests the case where channel idleness is disabled by passing an idle_timeout
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// of 0. Verifies that a READY channel with no RPCs does not move to IDLE.
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func (s) TestChannelIdleness_Disabled_NoActivity(t *testing.T) {
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// Setup channelz for testing.
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czCleanup := channelz.NewChannelzStorageForTesting()
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t.Cleanup(func() { czCleanupWrapper(czCleanup, t) })
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// Create a ClientConn with idle_timeout set to 0.
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r := manual.NewBuilderWithScheme("whatever")
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(0), // Disable idleness.
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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// Start a test backend and push an address update via the resolver.
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Verify that the ClientConn moves to READY.
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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awaitState(ctx, t, cc, connectivity.Ready)
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// Verify that the ClientConn stay in READY.
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sCtx, sCancel := context.WithTimeout(ctx, 3*defaultTestShortIdleTimeout)
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defer sCancel()
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awaitNoStateChange(sCtx, t, cc, connectivity.Ready)
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// Verify that there are no idleness related channelz events.
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if err := channelzTraceEventNotFound(ctx, "entering idle mode"); err != nil {
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t.Fatal(err)
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}
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if err := channelzTraceEventNotFound(ctx, "exiting idle mode"); err != nil {
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t.Fatal(err)
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}
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}
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// Tests the case where channel idleness is enabled by passing a small value for
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// idle_timeout. Verifies that a READY channel with no RPCs moves to IDLE.
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func (s) TestChannelIdleness_Enabled_NoActivity(t *testing.T) {
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// Setup channelz for testing.
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czCleanup := channelz.NewChannelzStorageForTesting()
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t.Cleanup(func() { czCleanupWrapper(czCleanup, t) })
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// Create a ClientConn with a short idle_timeout.
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r := manual.NewBuilderWithScheme("whatever")
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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// Start a test backend and push an address update via the resolver.
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Verify that the ClientConn moves to READY.
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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awaitState(ctx, t, cc, connectivity.Ready)
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// Verify that the ClientConn moves to IDLE as there is no activity.
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awaitState(ctx, t, cc, connectivity.Idle)
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// Verify idleness related channelz events.
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if err := channelzTraceEventFound(ctx, "entering idle mode"); err != nil {
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t.Fatal(err)
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}
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}
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// Tests the case where channel idleness is enabled by passing a small value for
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// idle_timeout. Verifies that a READY channel with an ongoing RPC stays READY.
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func (s) TestChannelIdleness_Enabled_OngoingCall(t *testing.T) {
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// Setup channelz for testing.
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czCleanup := channelz.NewChannelzStorageForTesting()
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t.Cleanup(func() { czCleanupWrapper(czCleanup, t) })
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// Create a ClientConn with a short idle_timeout.
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r := manual.NewBuilderWithScheme("whatever")
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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// Start a test backend which keeps a unary RPC call active by blocking on a
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// channel that is closed by the test later on. Also push an address update
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// via the resolver.
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blockCh := make(chan struct{})
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backend := &stubserver.StubServer{
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EmptyCallF: func(ctx context.Context, in *testpb.Empty) (*testpb.Empty, error) {
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<-blockCh
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return &testpb.Empty{}, nil
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},
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}
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if err := backend.StartServer(); err != nil {
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t.Fatalf("Failed to start backend: %v", err)
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}
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t.Cleanup(backend.Stop)
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Verify that the ClientConn moves to READY.
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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awaitState(ctx, t, cc, connectivity.Ready)
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// Spawn a goroutine which checks expected state transitions and idleness
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// channelz trace events. It eventually closes `blockCh`, thereby unblocking
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// the server RPC handler and the unary call below.
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errCh := make(chan error, 1)
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go func() {
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// Verify that the ClientConn stay in READY.
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sCtx, sCancel := context.WithTimeout(ctx, 3*defaultTestShortIdleTimeout)
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defer sCancel()
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awaitNoStateChange(sCtx, t, cc, connectivity.Ready)
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// Verify that there are no idleness related channelz events.
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if err := channelzTraceEventNotFound(ctx, "entering idle mode"); err != nil {
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errCh <- err
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return
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}
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if err := channelzTraceEventNotFound(ctx, "exiting idle mode"); err != nil {
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errCh <- err
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return
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}
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// Unblock the unary RPC on the server.
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close(blockCh)
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errCh <- nil
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}()
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// Make a unary RPC that blocks on the server, thereby ensuring that the
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// count of active RPCs on the client is non-zero.
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client := testgrpc.NewTestServiceClient(cc)
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if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Errorf("EmptyCall RPC failed: %v", err)
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}
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select {
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case err := <-errCh:
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if err != nil {
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t.Fatal(err)
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}
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case <-ctx.Done():
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t.Fatalf("Timeout when trying to verify that an active RPC keeps channel from moving to IDLE")
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}
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}
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// Tests the case where channel idleness is enabled by passing a small value for
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// idle_timeout. Verifies that activity on a READY channel (frequent and short
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// RPCs) keeps it from moving to IDLE.
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func (s) TestChannelIdleness_Enabled_ActiveSinceLastCheck(t *testing.T) {
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// Setup channelz for testing.
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czCleanup := channelz.NewChannelzStorageForTesting()
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t.Cleanup(func() { czCleanupWrapper(czCleanup, t) })
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// Create a ClientConn with a short idle_timeout.
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r := manual.NewBuilderWithScheme("whatever")
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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// Start a test backend and push an address update via the resolver.
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Verify that the ClientConn moves to READY.
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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awaitState(ctx, t, cc, connectivity.Ready)
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// For a duration of three times the configured idle timeout, making RPCs
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// every now and then and ensure that the channel does not move out of
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// READY.
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sCtx, sCancel := context.WithTimeout(ctx, 3*defaultTestShortIdleTimeout)
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defer sCancel()
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go func() {
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for ; sCtx.Err() == nil; <-time.After(defaultTestShortIdleTimeout / 4) {
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client := testgrpc.NewTestServiceClient(cc)
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if _, err := client.EmptyCall(sCtx, &testpb.Empty{}); err != nil {
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// While iterating through this for loop, at some point in time,
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// the context deadline will expire. It is safe to ignore that
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// error code.
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if status.Code(err) != codes.DeadlineExceeded {
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t.Errorf("EmptyCall RPC failed: %v", err)
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return
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}
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}
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}
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}()
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// Verify that the ClientConn stay in READY.
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awaitNoStateChange(sCtx, t, cc, connectivity.Ready)
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// Verify that there are no idleness related channelz events.
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if err := channelzTraceEventNotFound(ctx, "entering idle mode"); err != nil {
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t.Fatal(err)
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}
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if err := channelzTraceEventNotFound(ctx, "exiting idle mode"); err != nil {
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t.Fatal(err)
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}
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}
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// Tests the case where channel idleness is enabled by passing a small value for
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// idle_timeout. Verifies that a READY channel with no RPCs moves to IDLE. Also
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// verifies that a subsequent RPC on the IDLE channel kicks it out of IDLE.
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func (s) TestChannelIdleness_Enabled_ExitIdleOnRPC(t *testing.T) {
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// Setup channelz for testing.
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czCleanup := channelz.NewChannelzStorageForTesting()
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t.Cleanup(func() { czCleanupWrapper(czCleanup, t) })
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// Start a test backend and set the bootstrap state of the resolver to
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// include this address. This will ensure that when the resolver is
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// restarted when exiting idle, it will push the same address to grpc again.
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r := manual.NewBuilderWithScheme("whatever")
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Create a ClientConn with a short idle_timeout.
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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// Verify that the ClientConn moves to READY.
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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awaitState(ctx, t, cc, connectivity.Ready)
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// Verify that the ClientConn moves to IDLE as there is no activity.
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awaitState(ctx, t, cc, connectivity.Idle)
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// Verify idleness related channelz events.
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if err := channelzTraceEventFound(ctx, "entering idle mode"); err != nil {
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t.Fatal(err)
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}
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// Make an RPC and ensure that it succeeds and moves the channel back to
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// READY.
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client := testgrpc.NewTestServiceClient(cc)
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if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall RPC failed: %v", err)
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}
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awaitState(ctx, t, cc, connectivity.Ready)
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if err := channelzTraceEventFound(ctx, "exiting idle mode"); err != nil {
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t.Fatal(err)
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}
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}
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// Tests the case where channel idleness is enabled by passing a small value for
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// idle_timeout. Simulates a race between the idle timer firing and RPCs being
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// initiated, after a period of inactivity on the channel.
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//
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// After a period of inactivity (for the configured idle timeout duration), when
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// RPCs are started, there are two possibilities:
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// - the idle timer wins the race and puts the channel in idle. The RPCs then
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// kick it out of idle.
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// - the RPCs win the race, and therefore the channel never moves to idle.
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//
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// In either of these cases, all RPCs must succeed.
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func (s) TestChannelIdleness_Enabled_IdleTimeoutRacesWithRPCs(t *testing.T) {
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// Setup channelz for testing.
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czCleanup := channelz.NewChannelzStorageForTesting()
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t.Cleanup(func() { czCleanupWrapper(czCleanup, t) })
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// Start a test backend and set the bootstrap state of the resolver to
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// include this address. This will ensure that when the resolver is
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// restarted when exiting idle, it will push the same address to grpc again.
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r := manual.NewBuilderWithScheme("whatever")
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Create a ClientConn with a short idle_timeout.
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortTimeout),
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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// Verify that the ClientConn moves to READY.
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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client := testgrpc.NewTestServiceClient(cc)
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if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Errorf("EmptyCall RPC failed: %v", err)
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}
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// Make an RPC every defaultTestShortTimeout duration so as to race with the
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// idle timeout. Whether the idle timeout wins the race or the RPC wins the
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// race, RPCs must succeed.
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for i := 0; i < 20; i++ {
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<-time.After(defaultTestShortTimeout)
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if _, err := client.EmptyCall(ctx, &testpb.Empty{}); err != nil {
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t.Fatalf("EmptyCall RPC failed: %v", err)
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}
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t.Logf("Iteration %d succeeded", i)
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}
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}
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// Tests the case where the channel is IDLE and we call cc.Connect.
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func (s) TestChannelIdleness_Connect(t *testing.T) {
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// Start a test backend and set the bootstrap state of the resolver to
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// include this address. This will ensure that when the resolver is
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// restarted when exiting idle, it will push the same address to grpc again.
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r := manual.NewBuilderWithScheme("whatever")
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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r.InitialState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Create a ClientConn with a short idle_timeout.
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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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()
|
|
|
|
awaitState(ctx, t, cc, connectivity.Idle)
|
|
|
|
// Connect should exit channel idleness.
|
|
cc.Connect()
|
|
|
|
// Verify that the ClientConn moves back to READY.
|
|
awaitState(ctx, t, cc, connectivity.Ready)
|
|
}
|