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本篇文章介绍如何查询 Binlog 的生成时间。云上 RDS 有日志管理,但是自建实例没有,该脚本可用于自建实例闪回定位 Binlog 文件。
直接上代码吧~
通过读取 Binlog FORMAT_DESCRIPTION_EVENT header 时间戳来实现读取 Binlog 生产时间。
# -*- coding: utf-8 -*- import os import sys import math import time import struct import argparse binlog_quer_event_stern = 4 binlog_event_fix_part = 13 table_map_event_fix_length = 8 BINLOG_FILE_HEADER = b"\xFE\x62\x69\x6E" binlog_event_header_len = 19 class BinlogTimestamp(object): def __init__(self, index_path): self.index_path = index_path def main(self): binlog_info_list = list() for file_path in self.reed_index_file(): result = self.read_binlog_pos(file_path) binlog_info_list.append({ "file_name": result[0], "binlog_size": result[2], "start_time": result[1] }) # print i = 0 while len(binlog_info_list) > i: if i + 1 == len(binlog_info_list): end_time = "now" else: end_time = binlog_info_list[i + 1]["start_time"] binlog_info_list[i]["end_time"] = end_time print(binlog_info_list[i]) i += 1 def read_binlog_pos(self, binlog_path): binlog_file_size = self.bit_conversion(os.path.getsize(binlog_path)) file_name = os.path.basename(binlog_path) with open(binlog_path, "rb") as r: # read BINLOG_FILE_HEADER if not r.read(4) == BINLOG_FILE_HEADER: print("Error: Is not a standard binlog file format.") sys.exit(0) # read binlog header FORMAT_DESCRIPTION_EVENT read_byte = r.read(binlog_event_header_len) result = struct.unpack("=IBIIIH", read_byte) type_code, event_length, event_timestamp, next_position = result[1], result[3], result[0], result[4] binlog_start_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(event_timestamp)) return file_name, binlog_start_time, binlog_file_size def reed_index_file(self): """ 读取 mysql-bin.index 文件 select @@log_bin_index; :return: """ with open(self.index_path) as r: content = r.readlines() return [x.replace("\n", "") for x in content] @staticmethod def bit_conversion(size, dot=2): size = float(size) if 0 <= size < 1: human_size = str(round(size / 0.125, dot)) + " b" elif 1 <= size < 1024: human_size = str(round(size, dot)) + " B" elif math.pow(1024, 1) <= size < math.pow(1024, 2): human_size = str(round(size / math.pow(1024, 1), dot)) + " KB" elif math.pow(1024, 2) <= size < math.pow(1024, 3): human_size = str(round(size / math.pow(1024, 2), dot)) + " MB" elif math.pow(1024, 3) <= size < math.pow(1024, 4): human_size = str(round(size / math.pow(1024, 3), dot)) + " GB" elif math.pow(1024, 4) <= size < math.pow(1024, 5): human_size = str(round(size / math.pow(1024, 4), dot)) + " TB" elif math.pow(1024, 5) <= size < math.pow(1024, 6): human_size = str(round(size / math.pow(1024, 5), dot)) + " PB" elif math.pow(1024, 6) <= size < math.pow(1024, 7): human_size = str(round(size / math.pow(1024, 6), dot)) + " EB" elif math.pow(1024, 7) <= size < math.pow(1024, 8): human_size = str(round(size / math.pow(1024, 7), dot)) + " ZB" elif math.pow(1024, 8) <= size < math.pow(1024, 9): human_size = str(round(size / math.pow(1024, 8), dot)) + " YB" elif math.pow(1024, 9) <= size < math.pow(1024, 10): human_size = str(round(size / math.pow(1024, 9), dot)) + " BB" elif math.pow(1024, 10) <= size < math.pow(1024, 11): human_size = str(round(size / math.pow(1024, 10), dot)) + " NB" elif math.pow(1024, 11) <= size < math.pow(1024, 12): human_size = str(round(size / math.pow(1024, 11), dot)) + " DB" elif math.pow(1024, 12) <= size: human_size = str(round(size / math.pow(1024, 12), dot)) + " CB" else: raise ValueError("bit_conversion Error") return human_size if __name__ == "__main__": file_name = sys.argv[1] bt = BinlogTimestamp(file_name) bt.main()
脚本上传到 MySQL 服务器后,指定 binlog index 文件位置即可:
python check_bintime.py /data/mysql_57/logs/mysql-bin.index
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