zopefoundation / ZEO / 21439552802

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master: 73%

Pull #246

github

Fix ZEO cache tracing wrt 2038 year

@bmwiedemann reports that ZEO tests fail in year 2038. From
https://github.com/zopefoundation/ZEO/issues/245:

    Failure in test cache_simul_properly_handles_load_miss_after_eviction_and_inval (ZEO.tests.test_cache)
    Failed doctest test for ZEO.tests.test_cache.cache_simul_properly_handles_load_miss_after_eviction_and_inval
      File "/home/abuild/rpmbuild/BUILD/python-ZEO-6.1-build/zeo-6.1/src/ZEO/tests/test_cache.py", line 1015, in cache_simul_properly_handles_load_miss_after_eviction_and_inval

    ----------------------------------------------------------------------
    File "/home/abuild/rpmbuild/BUILD/python-ZEO-6.1-build/zeo-6.1/src/ZEO/tests/test_cache.py", line 1021, in ZEO.tests.test_cache.cache_simul_properly_handles_load_miss_after_eviction_and_inval
    Failed example:
        cache = ZEO.cache.ClientCache('cache', 1<<21)
    Exception raised:
        Traceback (most recent call last):
          File "/usr/lib64/python3.11/doctest.py", line 1355, in __run
            exec(compile(example.source, filename, "single",
          File "<doctest ZEO.tests.test_cache.cache_simul_properly_handles_load_miss_after_eviction_and_inval[1]>", line 1, in <module>
            cache = ZEO.cache.ClientCache('cache', 1<<21)
          File "/home/abuild/rpmbuild/BUILD/python-ZEO-6.1-build/zeo-6.1/src/ZEO/cache.py", line 239, in __init__
            self._setup_trace(path)
          File "/home/abuild/rpmbuild/BUILD/python-ZEO-6.1-build/zeo-6.1/src/ZEO/cache.py", line 823, in _setup_trace
            _trace(0x00)
          File "/home/abuild/rpmbuild/BUILD/python-ZEO-6.1-build/zeo-6.1/src/ZEO/cache.py", line 814, in _trace
            pack(">iiH8s8s",
        struct.error: 'i' format requires -2147483648 <= number <= 2147483647

Unfortunately as ZEO/scripts/cache_stats.py and ZEO/scripts/cache_simul.py show
ZEO cache-trace files do not have header nor magic, so we cannot change format
of time field from 32-bit integ... (continued)

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