# -*- coding: utf-8 -*-
"""票 04：从服务日志提取 C1 50001 的堆栈。"""
import io, sys
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
txt = open(r'e:\code\crm-backend-matt\logs\t04-run.log', encoding='utf-8', errors='replace').read()
# 找最近的 ERROR/Exception 段
idx = txt.rfind('ERROR')
if idx < 0:
    idx = txt.rfind('Exception')
print('log size=', len(txt))
print(txt[max(0, idx - 500):idx + 2500] if idx >= 0 else '(no ERROR found)')