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clientv3: remove balancer tests
Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>
This commit is contained in:
Gyu-Ho Lee
parent
d1447a8f5a
commit
ea51c25030
@ -1,239 +0,0 @@
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// Copyright 2016 The etcd 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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package clientv3
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import (
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"errors"
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"net"
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"sync"
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"testing"
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"time"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/pkg/testutil"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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)
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var (
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endpoints = []string{"localhost:2379", "localhost:22379", "localhost:32379"}
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)
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func TestBalancerGetUnblocking(t *testing.T) {
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sb := newSimpleBalancer(endpoints)
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defer sb.Close()
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if addrs := <-sb.Notify(); len(addrs) != len(endpoints) {
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t.Errorf("Initialize newSimpleBalancer should have triggered Notify() chan, but it didn't")
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}
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unblockingOpts := grpc.BalancerGetOptions{BlockingWait: false}
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_, _, err := sb.Get(context.Background(), unblockingOpts)
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if err != ErrNoAddrAvilable {
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t.Errorf("Get() with no up endpoints should return ErrNoAddrAvailable, got: %v", err)
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}
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down1 := sb.Up(grpc.Address{Addr: endpoints[1]})
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if addrs := <-sb.Notify(); len(addrs) != 1 {
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t.Errorf("first Up() should have triggered balancer to send the first connected address via Notify chan so that other connections can be closed")
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}
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down2 := sb.Up(grpc.Address{Addr: endpoints[2]})
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addrFirst, putFun, err := sb.Get(context.Background(), unblockingOpts)
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if err != nil {
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t.Errorf("Get() with up endpoints should success, got %v", err)
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}
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if addrFirst.Addr != endpoints[1] {
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t.Errorf("Get() didn't return expected address, got %v", addrFirst)
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}
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if putFun == nil {
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t.Errorf("Get() returned unexpected nil put function")
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}
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addrSecond, _, _ := sb.Get(context.Background(), unblockingOpts)
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if addrFirst.Addr != addrSecond.Addr {
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t.Errorf("Get() didn't return the same address as previous call, got %v and %v", addrFirst, addrSecond)
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}
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down1(errors.New("error"))
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if addrs := <-sb.Notify(); len(addrs) != len(endpoints) {
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t.Errorf("closing the only connection should triggered balancer to send the all endpoints via Notify chan so that we can establish a connection")
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}
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down2(errors.New("error"))
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_, _, err = sb.Get(context.Background(), unblockingOpts)
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if err != ErrNoAddrAvilable {
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t.Errorf("Get() with no up endpoints should return ErrNoAddrAvailable, got: %v", err)
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}
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}
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func TestBalancerGetBlocking(t *testing.T) {
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sb := newSimpleBalancer(endpoints)
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defer sb.Close()
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if addrs := <-sb.Notify(); len(addrs) != len(endpoints) {
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t.Errorf("Initialize newSimpleBalancer should have triggered Notify() chan, but it didn't")
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}
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blockingOpts := grpc.BalancerGetOptions{BlockingWait: true}
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ctx, _ := context.WithTimeout(context.Background(), time.Millisecond*100)
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_, _, err := sb.Get(ctx, blockingOpts)
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if err != context.DeadlineExceeded {
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t.Errorf("Get() with no up endpoints should timeout, got %v", err)
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}
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downC := make(chan func(error), 1)
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go func() {
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// ensure sb.Up() will be called after sb.Get() to see if Up() releases blocking Get()
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time.Sleep(time.Millisecond * 100)
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f := sb.Up(grpc.Address{Addr: endpoints[1]})
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if addrs := <-sb.Notify(); len(addrs) != 1 {
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t.Errorf("first Up() should have triggered balancer to send the first connected address via Notify chan so that other connections can be closed")
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}
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downC <- f
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}()
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addrFirst, putFun, err := sb.Get(context.Background(), blockingOpts)
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if err != nil {
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t.Errorf("Get() with up endpoints should success, got %v", err)
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}
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if addrFirst.Addr != endpoints[1] {
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t.Errorf("Get() didn't return expected address, got %v", addrFirst)
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}
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if putFun == nil {
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t.Errorf("Get() returned unexpected nil put function")
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}
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down1 := <-downC
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down2 := sb.Up(grpc.Address{Addr: endpoints[2]})
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addrSecond, _, _ := sb.Get(context.Background(), blockingOpts)
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if addrFirst.Addr != addrSecond.Addr {
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t.Errorf("Get() didn't return the same address as previous call, got %v and %v", addrFirst, addrSecond)
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}
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down1(errors.New("error"))
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if addrs := <-sb.Notify(); len(addrs) != len(endpoints) {
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t.Errorf("closing the only connection should triggered balancer to send the all endpoints via Notify chan so that we can establish a connection")
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}
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down2(errors.New("error"))
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ctx, _ = context.WithTimeout(context.Background(), time.Millisecond*100)
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_, _, err = sb.Get(ctx, blockingOpts)
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if err != context.DeadlineExceeded {
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t.Errorf("Get() with no up endpoints should timeout, got %v", err)
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}
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}
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// TestBalancerDoNotBlockOnClose ensures that balancer and grpc don't deadlock each other
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// due to rapid open/close conn. The deadlock causes balancer.Close() to block forever.
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// See issue: https://github.com/coreos/etcd/issues/7283 for more detail.
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func TestBalancerDoNotBlockOnClose(t *testing.T) {
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defer testutil.AfterTest(t)
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kcl := newKillConnListener(t, 3)
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defer kcl.close()
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for i := 0; i < 5; i++ {
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sb := newSimpleBalancer(kcl.endpoints())
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conn, err := grpc.Dial("", grpc.WithInsecure(), grpc.WithBalancer(sb))
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if err != nil {
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t.Fatal(err)
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}
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kvc := pb.NewKVClient(conn)
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<-sb.readyc
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var wg sync.WaitGroup
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wg.Add(100)
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cctx, cancel := context.WithCancel(context.TODO())
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for j := 0; j < 100; j++ {
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go func() {
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defer wg.Done()
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kvc.Range(cctx, &pb.RangeRequest{}, grpc.FailFast(false))
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}()
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}
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// balancer.Close() might block
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// if balancer and grpc deadlock each other.
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bclosec, cclosec := make(chan struct{}), make(chan struct{})
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go func() {
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defer close(bclosec)
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sb.Close()
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}()
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go func() {
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defer close(cclosec)
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conn.Close()
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}()
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select {
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case <-bclosec:
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case <-time.After(3 * time.Second):
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testutil.FatalStack(t, "balancer close timeout")
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}
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select {
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case <-cclosec:
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case <-time.After(3 * time.Second):
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t.Fatal("grpc conn close timeout")
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}
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cancel()
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wg.Wait()
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}
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}
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// killConnListener listens incoming conn and kills it immediately.
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type killConnListener struct {
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wg sync.WaitGroup
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eps []string
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stopc chan struct{}
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t *testing.T
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}
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func newKillConnListener(t *testing.T, size int) *killConnListener {
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kcl := &killConnListener{stopc: make(chan struct{}), t: t}
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for i := 0; i < size; i++ {
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ln, err := net.Listen("tcp", ":0")
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if err != nil {
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t.Fatal(err)
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}
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kcl.eps = append(kcl.eps, ln.Addr().String())
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kcl.wg.Add(1)
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go kcl.listen(ln)
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}
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return kcl
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}
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func (kcl *killConnListener) endpoints() []string {
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return kcl.eps
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}
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func (kcl *killConnListener) listen(l net.Listener) {
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go func() {
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defer kcl.wg.Done()
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for {
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conn, err := l.Accept()
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select {
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case <-kcl.stopc:
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return
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default:
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}
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if err != nil {
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kcl.t.Fatal(err)
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}
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time.Sleep(1 * time.Millisecond)
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conn.Close()
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}
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}()
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<-kcl.stopc
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l.Close()
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}
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func (kcl *killConnListener) close() {
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close(kcl.stopc)
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kcl.wg.Wait()
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}
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