core: raise clear error when OpenSSL library is not found#318
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Bortlesboat wants to merge 1 commit intopetertodd:masterfrom
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core: raise clear error when OpenSSL library is not found#318Bortlesboat wants to merge 1 commit intopetertodd:masterfrom
Bortlesboat wants to merge 1 commit intopetertodd:masterfrom
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On Windows, ctypes.util.find_library() can return None for all candidate library names. Passing None to LoadLibrary() raises a confusing TypeError. Check for None first and raise an EnvironmentError with an actionable message instead. Fixes petertodd#316
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On Windows, all four find_library() candidates can return None (ssl.35, ssl, libeay32, libcrypto). When that happens, None gets passed straight to ctypes.cdll.LoadLibrary(), which throws a confusing TypeError:
This checks the result before calling LoadLibrary() and raises an EnvironmentError with a message that actually tells you what's wrong.
Fixes #316