Olivier Dony
4177e03c2d
A long time ago, in a commit far far away: 65a3751613,
we introduced a mechanism to support the "import emulator" feature[^1] of
cPython. It's used by some C native modules to trigger an on-the-spot
module import during a low-level function call.
Some of the modules that do this are `datetime` and `time`:
- https://github.com/python/cpython/blob/b6535ea7ecf40c51a9a13089d961c29abeaffa5e/Modules/timemodule.c#L892
- https://github.com/python/cpython/blob/b6535ea7ecf40c51a9a13089d961c29abeaffa5e/Modules/_datetimemodule.c#L1654
Those `PyImport_ImportModuleNoBlock()` calls were initially understood as real
calls that needed to return the imported module. But the actual return value is
never used by PyImport_Import. As long as the call succeeds, it is
sufficient that the modules are imported and present in `sys.modules`
afterwards:
https://github.com/python/cpython/blob/b6535ea7ecf40c51a9a13089d961c29abeaffa5e/Python/import.c#L1825-L1834
In order to avoid randomizing the order of module imports, which can cause
unpredictable behavior depending on the timing of those "emulated imports",
it's simpler to provide a "no-op" import function, and ensure that all the
allowed modules are imported in advance, when the server starts.
This is what this commit does. For good measure, it will raise an error
if the module being imported is not already imported, which means it was
not one of the expected/allowed modules. In that case, it's sufficient
to pre-import the module.
[^1]: https://github.com/python/cpython/blob/b6535ea7ecf40c51a9a13089d961c29abeaffa5e/Python/import.c#L1756-L1766
opw-3721469
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