github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/dm/syncer/safe-mode/mode_test.go (about)

     1  // Copyright 2019 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 mode
    15  
    16  import (
    17  	"testing"
    18  
    19  	. "github.com/pingcap/check"
    20  	"github.com/pingcap/tidb/pkg/util/filter"
    21  	tcontext "github.com/pingcap/tiflow/dm/pkg/context"
    22  )
    23  
    24  var _ = Suite(&testModeSuite{})
    25  
    26  func TestSuite(t *testing.T) {
    27  	TestingT(t)
    28  }
    29  
    30  type testModeSuite struct{}
    31  
    32  func (t *testModeSuite) TestMode(c *C) {
    33  	m := NewSafeMode()
    34  	c.Assert(m.Enable(), IsFalse)
    35  
    36  	tctx := tcontext.Background()
    37  	// Add 1
    38  	err := m.Add(tctx, 1)
    39  	c.Assert(err, IsNil)
    40  	c.Assert(m.Enable(), IsTrue)
    41  	err = m.Add(tctx, -1)
    42  	c.Assert(m.Enable(), IsFalse)
    43  	c.Assert(err, IsNil)
    44  
    45  	// Add n
    46  	err = m.Add(tctx, 101)
    47  	c.Assert(m.Enable(), IsTrue)
    48  	c.Assert(err, IsNil)
    49  	err = m.Add(tctx, -1)
    50  	c.Assert(m.Enable(), IsTrue)
    51  	c.Assert(err, IsNil)
    52  	err = m.Add(tctx, -100)
    53  	c.Assert(m.Enable(), IsFalse)
    54  	c.Assert(err, IsNil)
    55  
    56  	// IncrForTable
    57  	table := &filter.Table{
    58  		Schema: "schema",
    59  		Name:   "table",
    60  	}
    61  	err = m.IncrForTable(tctx, table)
    62  	c.Assert(err, IsNil)
    63  	err = m.IncrForTable(tctx, table) // re-Add
    64  	c.Assert(err, IsNil)
    65  	c.Assert(m.Enable(), IsTrue)
    66  	err = m.DescForTable(tctx, table)
    67  	c.Assert(err, IsNil)
    68  	c.Assert(m.Enable(), IsFalse)
    69  
    70  	// Add n + IncrForTable
    71  	err = m.Add(tctx, 100)
    72  	c.Assert(err, IsNil)
    73  	err = m.IncrForTable(tctx, table)
    74  	c.Assert(err, IsNil)
    75  	c.Assert(m.Enable(), IsTrue)
    76  	err = m.Add(tctx, -100)
    77  	c.Assert(err, IsNil)
    78  	err = m.DescForTable(tctx, table)
    79  	c.Assert(m.Enable(), IsFalse)
    80  	c.Assert(err, IsNil)
    81  
    82  	// Add becomes to negative
    83  	err = m.Add(tctx, -1)
    84  	c.Assert(err, NotNil)
    85  }