github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/dm/relay/remote_retry_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 relay
    15  
    16  import (
    17  	"context"
    18  	"errors"
    19  	"time"
    20  
    21  	gmysql "github.com/go-mysql-org/go-mysql/mysql"
    22  	. "github.com/pingcap/check"
    23  )
    24  
    25  var _ = Suite(&testReaderRetrySuite{})
    26  
    27  type testReaderRetrySuite struct{}
    28  
    29  func (t *testReaderRetrySuite) TestRetry(c *C) {
    30  	rr, err := NewReaderRetry(ReaderRetryConfig{
    31  		BackoffRollback: 200 * time.Millisecond,
    32  		BackoffMax:      1 * time.Second,
    33  		BackoffMin:      1 * time.Millisecond,
    34  		BackoffFactor:   2,
    35  	})
    36  	c.Assert(err, IsNil)
    37  	c.Assert(rr, NotNil)
    38  
    39  	retryableErr := gmysql.ErrBadConn
    40  	unRetryableErr := errors.New("custom error")
    41  	ctx := context.Background()
    42  
    43  	// check some times
    44  	for i := 0; i < 3; i++ {
    45  		c.Assert(rr.Check(ctx, retryableErr), IsTrue)
    46  	}
    47  	c.Assert(rr.bf.Current(), Equals, 8*time.Millisecond)
    48  
    49  	// check more times, until reach Max
    50  	for i := 0; i < 10; i++ {
    51  		c.Assert(rr.Check(ctx, retryableErr), IsTrue)
    52  	}
    53  	c.Assert(rr.bf.Current(), Equals, rr.cfg.BackoffMax)
    54  
    55  	// sleep 1s
    56  	time.Sleep(1 * time.Second)
    57  
    58  	// check with rollback, rollback 5 times, forward 1 time
    59  	c.Assert(rr.Check(ctx, retryableErr), IsTrue)
    60  	c.Assert(rr.bf.Current(), Equals, 64*time.Millisecond)
    61  
    62  	// check un-retryable error
    63  	c.Assert(rr.Check(ctx, unRetryableErr), IsFalse)
    64  
    65  	// check with context timeout
    66  	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Millisecond)
    67  	defer cancel()
    68  	c.Assert(rr.Check(ctx, retryableErr), IsFalse)
    69  }