binlog dump thread leaks

[actiontech-bot]

Description

Steps to reproduce the issue:

1. set up a replication
2. delete the job, or kill dtle

Describe the results you received:
MySQL binlog dump thread will still exists for minutes

Describe the results you expected:

Output of ./dtle version:

(not available)

Additional information you deem important (e.g. issue happens only occasionally):

Additional details (log, config, job config etc):

[ghost]

fixed in 385c441.

It is mainly affected by HeartbeatPeriod when setting up streaming.

Test shows that the dump thread will be closed when

• terminating dtle
• pausing a job
• deleting a job

[ghost]

• HeartbeatPeriod: mysql sends heart beat packet at this period
• ReadTimeout: client disconnect if no packet received for this timeout