Dario Mirovic
51995af258
transport: replace throwing protocol_exception with returns
...
Replace throwing `protocol_exception` with returning it as a result
or an exceptional future in the transport server module. The goal is
to improve performance.
Most of the `protocol_exception` throws were made from
`fragmented_temporary_buffer` module, by passing `exception_thrower()`
to its `read*` methods. `fragmented_temporary_buffer` is changed so
that it now accepts an exception creator, not exception thrower.
`fragmented_temporary_buffer_concepts::ExceptionCreator` concept replaced
`fragmented_temporary_buffer_concepts::ExceptionThrower` and all
methods that have been throwing now return failed result of type
`utils::result_with_exception_ptr`. This change is then propagated to the callers.
The scope of this patch is `protocol_exception`, so commitlog just calls
`.value()` method on the result. If the result failed, that will throw the
exception from the result, as defined by `utils::result_with_exception_ptr_throw_policy`.
This means that the behavior of commitlog module stays the same.
transport server module handles results gracefully. All the caller functions
that return non-future value `T` now return `utils::result_with_exception_ptr<T>`.
When the caller is a function that returns a future, and it receives
failed result, `make_exception_future(std::move(failed_result).value())`
is returned. The rest of the callstack up to the transport server `handle_error`
function is already working without throwing, and that's how zero throws is
achieved.
Fixes : #24567
2025-08-28 23:31:36 +02:00
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