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// Copyright 2019 Google LLC
//
// 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 testutil
import (
"fmt"
"github.com/google/go-cmp/cmp"
)
// OrderedKeyMsg is a message with key and data.
type OrderedKeyMsg struct {
Key string
Data string
}
// VerifyKeyOrdering verifies that received data was published and received in
// key order.
//
// TODO(deklerk): account for consistent redelivery.
func VerifyKeyOrdering(publishData, receiveData []OrderedKeyMsg) error {
publishKeyMap := make(map[string][]string)
receiveKeyMap := make(map[string][]string)
for _, d := range publishData {
if d.Key == "" {
continue
}
publishKeyMap[d.Key] = append(publishKeyMap[d.Key], d.Data)
}
for _, d := range receiveData {
if d.Key == "" {
continue
}
receiveKeyMap[d.Key] = append(receiveKeyMap[d.Key], d.Data)
}
if len(publishKeyMap) != len(receiveKeyMap) {
return fmt.Errorf("published %d keys, received %d - expected them to be equal but they were not", len(publishKeyMap), len(receiveKeyMap))
}
for k, pb := range publishKeyMap {
rd, ok := receiveKeyMap[k]
if !ok {
// Should never happen unless we're using a topic that's got some
// data in it already / topic test pollution / etc. So, basically,
// make sure a fresh topic is always used for integration tests.
return fmt.Errorf("saw key %s, but we never published this key", k)
}
if diff := cmp.Diff(pb, rd); diff != "" {
return fmt.Errorf("%s: got -, want +\n\t%s", k, diff)
}
}
return nil
}
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