[4.4] Fix handling of sub-ms transaction timeouts #1034
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Transaction timeouts are specified in seconds as float.
However, the server expects it in milliseconds as int. This would lead to
1) rounding issues: previously, the driver would multiply by 1000 and
then truncate to int. E.g., 256.4 seconds would be turned into 256399 ms
because of float imprecision.
Therefore, the built-in `round` is now used instead.
2) values below 1 ms (e.g., 0.0001) would be rounded down to 0. However, 0 is
a special value that instructs the server to not apply any timeout. This
is likely to surprise the user which specified a non-zero timeout. In this
special case, the driver now rounds up to 1 ms.
Back-port of: neo4j#940
AndyHeap-NeoTech
approved these changes
Apr 4, 2024
For better backwards compatibility, we're sending negative timeouts to the DBMS as the 4.4 driver did before (even though those values might not have the intuitive effect, we don't want to change the behavior of the driver too much in a patch release).
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Transaction timeouts are specified in seconds as float. However, the server expects it in milliseconds as int. This would lead to
then truncate to int. E.g., 256.4 seconds would be turned into 256399 ms
because of float imprecision.
Therefore, the built-in
roundis now used instead.a special value that instructs the server to not apply any timeout. This
is likely to surprise the user which specified a non-zero timeout. In this
special case, the driver now rounds up to 1 ms.
Back-port of: #940