Martin Zink created MINIFICPP-2155:
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Summary: Imporve StreamCallbacks error handling
Key: MINIFICPP-2155
URL: https://issues.apache.org/jira/browse/MINIFICPP-2155
Project: Apache NiFi MiNiFi C++
Issue Type: Improvement
Reporter: Martin Zink
Currently io::InputStreamCallback and io::OutputStreamCallback use int64_t to
return the results where the static_cast<size_t>(-1) and
static_cast<size_t>(-2) signals something went wrong, and anything other than
those means the number of written/read bytes.
It would be better to use nonstd::expected<size_t, std::error_code> so we can
further propage the reason behind the errors so we dont need logging inside
these callbacks.
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