fix: preserve root-cause errors in KMSMasterKey exception chaining - #815
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KMSMasterKey caught boto3 ClientError (and KeyError) on the generate_data_key, encrypt, and decrypt calls and re-raised its own GenerateKeyError / EncryptKeyError / DecryptKeyError without chaining the original exception. Because the re-raise used a bare "raise SomeError(...)" instead of "raise SomeError(...) from error", the re-raised exception's __cause__ was None and the underlying KMS failure (for example an AccessDeniedException) was dropped from the traceback. Callers were left debugging in the dark with only the generic "unable to ... data key" message. Add "from error" at the three boto-call catch sites so the original exception is preserved as __cause__. The raised exception type and message are unchanged, so this is backward compatible; it only adds the chained cause to the traceback. Includes regression tests asserting __cause__ is the original ClientError for the generate, encrypt, and decrypt paths. Fixes #774 Signed-off-by: Arpit Jain <arpitjain099@gmail.com>
josecorella
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Aug 27, 2026
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Fixes #774. Original contribution by @arpitjain099 in #807.