net: fix packet sequence when sequence overflows

[djshow832]

What problem does this PR solve?

Issue Number: close #377

Problem Summary:

• The uncompressed sequence is incorrectly set before writing: it should be set before writing the uncompressed packet, rather than writing the compressed packet.
• The compressed sequence is set to 0 when the uncompressed sequence overflows. SetSequence() mistakenly set both the compressed and uncompressed sequences to 0.

What is changed and how it works:

• Move BeginRW from compressedReadWriter to PacketIO so that the uncompressed sequence can be set before writing the uncompressed packet.
• Add a ResetSequence() and only set the compressed sequence to 0 when a new command begins.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Tested with jdbc-test:

• ConnectionRegressionTest#testBug11237
• ConnectionTest#testCompression
• ConnectionTest#testUseCompress

Test with sysbench (--range_size=1000):

sysbench --table_size=10000 --mysql-user=root --threads=1 --time=60 --report-interval=10 --mysql-host=127.0.0.1 --mysql-port=6000 --mysql-db=test --mysql-compression=on oltp_read_only --point_selects=0 --sum_ranges=0 --order_ranges=0 --distinct_ranges=0 --simple_ranges=1 --range_size=1000 run

Notable changes

• Has configuration change
• Has HTTP API interfaces change
• Has tiproxyctl change
• Other user behavior changes

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xhebox

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-12 03:03:50.958074527 +0000 UTC m=+1280628.545184672: ☑️ agreed by xhebox.

[xhebox]

/retest