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// Copyright 2018 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !cluster_proxy
// +build !cluster_proxy
package clientv3test
import (
"context"
"fmt"
"strings"
"testing"
"time"
"go.etcd.io/etcd/client/pkg/v3/testutil"
"go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/tests/v3/integration"
)
// TestWatchFragmentDisable ensures that large watch
// response exceeding server-side request limit can
// arrive even without watch response fragmentation.
func TestWatchFragmentDisable(t *testing.T) {
testWatchFragment(t, false, false)
}
// TestWatchFragmentDisableWithGRPCLimit verifies
// large watch response exceeding server-side request
// limit and client-side gRPC response receive limit
// cannot arrive without watch events fragmentation,
// because multiple events exceed client-side gRPC
// response receive limit.
func TestWatchFragmentDisableWithGRPCLimit(t *testing.T) {
testWatchFragment(t, false, true)
}
// TestWatchFragmentEnable ensures that large watch
// response exceeding server-side request limit arrive
// with watch response fragmentation.
func TestWatchFragmentEnable(t *testing.T) {
testWatchFragment(t, true, false)
}
// TestWatchFragmentEnableWithGRPCLimit verifies
// large watch response exceeding server-side request
// limit and client-side gRPC response receive limit
// can arrive only when watch events are fragmented.
func TestWatchFragmentEnableWithGRPCLimit(t *testing.T) {
testWatchFragment(t, true, true)
}
// testWatchFragment triggers watch response that spans over multiple
// revisions exceeding server request limits when combined.
func testWatchFragment(t *testing.T, fragment, exceedRecvLimit bool) {
integration.BeforeTest(t)
cfg := &integration.ClusterConfig{
Size: 1,
MaxRequestBytes: 1.5 * 1024 * 1024,
}
if exceedRecvLimit {
cfg.ClientMaxCallRecvMsgSize = 1.5 * 1024 * 1024
}
clus := integration.NewClusterV3(t, cfg)
defer clus.Terminate(t)
cli := clus.Client(0)
errc := make(chan error)
for i := 0; i < 10; i++ {
go func(i int) {
_, err := cli.Put(context.TODO(),
fmt.Sprint("foo", i),
strings.Repeat("a", 1024*1024),
)
errc <- err
}(i)
}
for i := 0; i < 10; i++ {
if err := <-errc; err != nil {
t.Fatalf("failed to put: %v", err)
}
}
opts := []clientv3.OpOption{clientv3.WithPrefix(), clientv3.WithRev(1)}
if fragment {
opts = append(opts, clientv3.WithFragment())
}
wch := cli.Watch(context.TODO(), "foo", opts...)
// expect 10 MiB watch response
select {
case ws := <-wch:
// without fragment, should exceed gRPC client receive limit
if !fragment && exceedRecvLimit {
if len(ws.Events) != 0 {
t.Fatalf("expected 0 events with watch fragmentation, got %d", len(ws.Events))
}
exp := "code = ResourceExhausted desc = grpc: received message larger than max ("
if !strings.Contains(ws.Err().Error(), exp) {
t.Fatalf("expected 'ResourceExhausted' error, got %v", ws.Err())
}
return
}
// still expect merged watch events
if len(ws.Events) != 10 {
t.Fatalf("expected 10 events with watch fragmentation, got %d", len(ws.Events))
}
if ws.Err() != nil {
t.Fatalf("unexpected error %v", ws.Err())
}
case <-time.After(testutil.RequestTimeout):
t.Fatalf("took too long to receive events")
}
}
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