github.com/KinWaiYuen/client-go/v2@v2.5.4/txnkv/transaction/batch_getter_test.go (about)

     1  // Copyright 2021 TiKV Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // NOTE: The code in this file is based on code from the
    16  // TiDB project, licensed under the Apache License v 2.0
    17  //
    18  // https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/tests/snapshot_test.go
    19  //
    20  
    21  // Copyright 2016 PingCAP, Inc.
    22  //
    23  // Licensed under the Apache License, Version 2.0 (the "License");
    24  // you may not use this file except in compliance with the License.
    25  // You may obtain a copy of the License at
    26  //
    27  //     http://www.apache.org/licenses/LICENSE-2.0
    28  //
    29  // Unless required by applicable law or agreed to in writing, software
    30  // distributed under the License is distributed on an "AS IS" BASIS,
    31  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    32  // See the License for the specific language governing permissions and
    33  // limitations under the License.
    34  
    35  package transaction
    36  
    37  import (
    38  	"context"
    39  	"testing"
    40  
    41  	tikverr "github.com/KinWaiYuen/client-go/v2/error"
    42  	"github.com/KinWaiYuen/client-go/v2/kv"
    43  	"github.com/stretchr/testify/assert"
    44  )
    45  
    46  func TestBufferBatchGetter(t *testing.T) {
    47  	snap := newMockStore()
    48  	ka := []byte("a")
    49  	kb := []byte("b")
    50  	kc := []byte("c")
    51  	kd := []byte("d")
    52  	snap.Set(ka, ka)
    53  	snap.Set(kb, kb)
    54  	snap.Set(kc, kc)
    55  	snap.Set(kd, kd)
    56  
    57  	buffer := newMockStore()
    58  	buffer.Set(ka, []byte("a1"))
    59  	buffer.Delete(kb)
    60  
    61  	batchGetter := NewBufferBatchGetter(buffer, snap)
    62  	result, err := batchGetter.BatchGet(context.Background(), [][]byte{ka, kb, kc, kd})
    63  	assert.NoError(t, err)
    64  	assert.Equal(t, 3, len(result))
    65  	assert.Equal(t, "a1", string(result[string(ka)]))
    66  	assert.Equal(t, "c", string(result[string(kc)]))
    67  	assert.Equal(t, "d", string(result[string(kd)]))
    68  }
    69  
    70  type mockBatchGetterStore struct {
    71  	index [][]byte
    72  	value [][]byte
    73  }
    74  
    75  func newMockStore() *mockBatchGetterStore {
    76  	return &mockBatchGetterStore{
    77  		index: make([][]byte, 0),
    78  		value: make([][]byte, 0),
    79  	}
    80  }
    81  
    82  func (s *mockBatchGetterStore) Len() int {
    83  	return len(s.index)
    84  }
    85  
    86  func (s *mockBatchGetterStore) Get(k []byte) ([]byte, error) {
    87  	for i, key := range s.index {
    88  		if kv.CmpKey(key, k) == 0 {
    89  			return s.value[i], nil
    90  		}
    91  	}
    92  	return nil, tikverr.ErrNotExist
    93  }
    94  
    95  func (s *mockBatchGetterStore) BatchGet(ctx context.Context, keys [][]byte) (map[string][]byte, error) {
    96  	m := make(map[string][]byte)
    97  	for _, k := range keys {
    98  		v, err := s.Get(k)
    99  		if err == nil {
   100  			m[string(k)] = v
   101  			continue
   102  		}
   103  		if tikverr.IsErrNotFound(err) {
   104  			continue
   105  		}
   106  		return m, err
   107  	}
   108  	return m, nil
   109  }
   110  
   111  func (s *mockBatchGetterStore) Set(k []byte, v []byte) error {
   112  	for i, key := range s.index {
   113  		if kv.CmpKey(key, k) == 0 {
   114  			s.value[i] = v
   115  			return nil
   116  		}
   117  	}
   118  	s.index = append(s.index, k)
   119  	s.value = append(s.value, v)
   120  	return nil
   121  }
   122  
   123  func (s *mockBatchGetterStore) Delete(k []byte) error {
   124  	s.Set(k, []byte{})
   125  	return nil
   126  }