github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/pingcap/tidb/util/prefix_helper_test.go (about)

     1  // Copyright 2015 PingCAP, Inc.
     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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package util
    15  
    16  import (
    17  	"fmt"
    18  	"testing"
    19  
    20  	. "github.com/insionng/yougam/libraries/pingcap/check"
    21  	"github.com/insionng/yougam/libraries/pingcap/tidb/kv"
    22  	"github.com/insionng/yougam/libraries/pingcap/tidb/store/localstore"
    23  	"github.com/insionng/yougam/libraries/pingcap/tidb/store/localstore/goleveldb"
    24  	"github.com/insionng/yougam/libraries/pingcap/tidb/util/testleak"
    25  )
    26  
    27  const (
    28  	startIndex = 0
    29  	testCount  = 12
    30  	testPow    = 10
    31  )
    32  
    33  func TestT(t *testing.T) {
    34  	TestingT(t)
    35  }
    36  
    37  var _ = Suite(&testPrefixSuite{})
    38  
    39  type testPrefixSuite struct {
    40  	s kv.Storage
    41  }
    42  
    43  func (s *testPrefixSuite) SetUpSuite(c *C) {
    44  	path := "memory:"
    45  	d := localstore.Driver{
    46  		Driver: goleveldb.MemoryDriver{},
    47  	}
    48  	store, err := d.Open(path)
    49  	c.Assert(err, IsNil)
    50  	s.s = store
    51  
    52  	// must in cache
    53  	cacheS, _ := d.Open(path)
    54  	c.Assert(cacheS, Equals, store)
    55  }
    56  
    57  func (s *testPrefixSuite) TearDownSuite(c *C) {
    58  	err := s.s.Close()
    59  	c.Assert(err, IsNil)
    60  }
    61  
    62  func encodeInt(n int) []byte {
    63  	return []byte(fmt.Sprintf("%d", n))
    64  }
    65  
    66  type MockContext struct {
    67  	prefix int
    68  	values map[fmt.Stringer]interface{}
    69  	kv.Storage
    70  	txn kv.Transaction
    71  }
    72  
    73  func (c *MockContext) SetValue(key fmt.Stringer, value interface{}) {
    74  	c.values[key] = value
    75  }
    76  
    77  func (c *MockContext) Value(key fmt.Stringer) interface{} {
    78  	value := c.values[key]
    79  	return value
    80  }
    81  
    82  func (c *MockContext) ClearValue(key fmt.Stringer) {
    83  	delete(c.values, key)
    84  }
    85  
    86  func (c *MockContext) GetTxn(forceNew bool) (kv.Transaction, error) {
    87  	var err error
    88  	c.txn, err = c.Begin()
    89  	if err != nil {
    90  		return nil, err
    91  	}
    92  
    93  	return c.txn, nil
    94  }
    95  
    96  func (c *MockContext) fillTxn() error {
    97  	if c.txn == nil {
    98  		return nil
    99  	}
   100  
   101  	var err error
   102  	for i := startIndex; i < testCount; i++ {
   103  		val := encodeInt(i + (c.prefix * testPow))
   104  		err = c.txn.Set(val, val)
   105  		if err != nil {
   106  			return err
   107  		}
   108  	}
   109  
   110  	return nil
   111  }
   112  
   113  func (c *MockContext) FinishTxn(rollback bool) error {
   114  	if c.txn == nil {
   115  		return nil
   116  	}
   117  
   118  	return c.txn.Commit()
   119  }
   120  
   121  func (s *testPrefixSuite) TestPrefix(c *C) {
   122  	defer testleak.AfterTest(c)()
   123  	ctx := &MockContext{10000000, make(map[fmt.Stringer]interface{}), s.s, nil}
   124  	ctx.fillTxn()
   125  	txn, err := ctx.GetTxn(false)
   126  	c.Assert(err, IsNil)
   127  	err = DelKeyWithPrefix(txn, encodeInt(ctx.prefix))
   128  	c.Assert(err, IsNil)
   129  	err = ctx.FinishTxn(false)
   130  	c.Assert(err, IsNil)
   131  
   132  	txn, err = s.s.Begin()
   133  	c.Assert(err, IsNil)
   134  	k := []byte("key100jfowi878230")
   135  	err = txn.Set(k, []byte("val32dfaskli384757^*&%^"))
   136  	c.Assert(err, IsNil)
   137  	err = ScanMetaWithPrefix(txn, k, func(kv.Key, []byte) bool {
   138  		return true
   139  	})
   140  	c.Assert(err, IsNil)
   141  	err = txn.Commit()
   142  	c.Assert(err, IsNil)
   143  }
   144  
   145  func (s *testPrefixSuite) TestPrefixFilter(c *C) {
   146  	defer testleak.AfterTest(c)()
   147  	rowKey := []byte("test@#$%l(le[0]..prefix) 2uio")
   148  	rowKey[8] = 0x00
   149  	rowKey[9] = 0x00
   150  	f := RowKeyPrefixFilter(rowKey)
   151  	b := f(append(rowKey, []byte("akjdf3*(34")...))
   152  	c.Assert(b, IsFalse)
   153  	buf := f([]byte("sjfkdlsaf"))
   154  	c.Assert(buf, IsTrue)
   155  }