github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/dm/pkg/retry/strategy_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 retry
    15  
    16  import (
    17  	"database/sql/driver"
    18  	"testing"
    19  	"time"
    20  
    21  	"github.com/pingcap/tidb/pkg/util/dbutil"
    22  	tcontext "github.com/pingcap/tiflow/dm/pkg/context"
    23  	"github.com/pingcap/tiflow/dm/pkg/terror"
    24  	"github.com/stretchr/testify/require"
    25  )
    26  
    27  func TestFiniteRetryStrategy(t *testing.T) {
    28  	t.Parallel()
    29  	strategy := &FiniteRetryStrategy{}
    30  
    31  	params := Params{
    32  		RetryCount:         1,
    33  		BackoffStrategy:    Stable,
    34  		FirstRetryDuration: time.Second,
    35  		IsRetryableFn: func(int, error) bool {
    36  			return false
    37  		},
    38  	}
    39  	ctx := tcontext.Background()
    40  
    41  	operateFn := func(*tcontext.Context) (interface{}, error) {
    42  		return nil, terror.ErrDBDriverError.Generate("test database error")
    43  	}
    44  
    45  	_, opCount, err := strategy.Apply(ctx, params, operateFn)
    46  	require.Equal(t, 0, opCount)
    47  	require.True(t, terror.ErrDBDriverError.Equal(err))
    48  
    49  	params.IsRetryableFn = func(int, error) bool {
    50  		return true
    51  	}
    52  	_, opCount, err = strategy.Apply(ctx, params, operateFn)
    53  	require.Equal(t, params.RetryCount, opCount)
    54  	require.True(t, terror.ErrDBDriverError.Equal(err))
    55  
    56  	params.RetryCount = 3
    57  
    58  	_, opCount, err = strategy.Apply(ctx, params, operateFn)
    59  	require.Equal(t, params.RetryCount, opCount)
    60  	require.True(t, terror.ErrDBDriverError.Equal(err))
    61  
    62  	// invalid connection will return ErrInvalidConn immediately no matter how many retries left
    63  	params.IsRetryableFn = func(int, error) bool {
    64  		return dbutil.IsRetryableError(err)
    65  	}
    66  	operateFn = func(*tcontext.Context) (interface{}, error) {
    67  		mysqlErr := driver.ErrBadConn
    68  		return nil, terror.ErrDBInvalidConn.Delegate(mysqlErr, "test invalid connection")
    69  	}
    70  	_, opCount, err = strategy.Apply(ctx, params, operateFn)
    71  	require.Equal(t, 0, opCount)
    72  	require.True(t, terror.ErrDBInvalidConn.Equal(err))
    73  
    74  	params.IsRetryableFn = func(int, error) bool {
    75  		return IsConnectionError(err)
    76  	}
    77  	_, opCount, err = strategy.Apply(ctx, params, operateFn)
    78  	require.Equal(t, 3, opCount)
    79  	require.True(t, terror.ErrDBInvalidConn.Equal(err))
    80  
    81  	retValue := "success"
    82  	operateFn = func(*tcontext.Context) (interface{}, error) {
    83  		return retValue, nil
    84  	}
    85  	ret, opCount, err := strategy.Apply(ctx, params, operateFn)
    86  	require.Equal(t, retValue, ret.(string))
    87  	require.Equal(t, 0, opCount)
    88  	require.NoError(t, err)
    89  }