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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.
package v3rpc
import (
"bytes"
"math"
"testing"
pb "go.etcd.io/etcd/api/v3/etcdserverpb"
"go.etcd.io/etcd/api/v3/mvccpb"
)
func TestSendFragment(t *testing.T) {
tt := []struct {
wr *pb.WatchResponse
maxRequestBytes int
fragments int
werr error
}{
{ // large limit should not fragment
wr: createResponse(100, 1),
maxRequestBytes: math.MaxInt32,
fragments: 1,
},
{ // large limit for two messages, expect no fragment
wr: createResponse(10, 2),
maxRequestBytes: 50,
fragments: 1,
},
{ // limit is small but only one message, expect no fragment
wr: createResponse(1024, 1),
maxRequestBytes: 1,
fragments: 1,
},
{ // exceed limit only when combined, expect fragments
wr: createResponse(11, 5),
maxRequestBytes: 20,
fragments: 5,
},
{ // 5 events with each event exceeding limits, expect fragments
wr: createResponse(15, 5),
maxRequestBytes: 10,
fragments: 5,
},
{ // 4 events with some combined events exceeding limits
wr: createResponse(10, 4),
maxRequestBytes: 35,
fragments: 2,
},
}
for i := range tt {
fragmentedResp := make([]*pb.WatchResponse, 0)
testSend := func(wr *pb.WatchResponse) error {
fragmentedResp = append(fragmentedResp, wr)
return nil
}
err := sendFragments(tt[i].wr, tt[i].maxRequestBytes, testSend)
if err != tt[i].werr {
t.Errorf("#%d: expected error %v, got %v", i, tt[i].werr, err)
}
got := len(fragmentedResp)
if got != tt[i].fragments {
t.Errorf("#%d: expected response number %d, got %d", i, tt[i].fragments, got)
}
if got > 0 && fragmentedResp[got-1].Fragment {
t.Errorf("#%d: expected fragment=false in last response, got %+v", i, fragmentedResp[got-1])
}
}
}
func createResponse(dataSize, events int) (resp *pb.WatchResponse) {
resp = &pb.WatchResponse{Events: make([]*mvccpb.Event, events)}
for i := range resp.Events {
resp.Events[i] = &mvccpb.Event{
Kv: &mvccpb.KeyValue{
Key: bytes.Repeat([]byte("a"), dataSize),
},
}
}
return resp
}
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