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libutil: make exception wrapping accessible outside of TRY_AWAIT

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this will be useful for rpc cases, and it reduces macro code expasions.

Change-Id: I47c837fb5efab8eb408fcf9617055ea1562fc422
This commit is contained in:
eldritch horrors
2026-06-30 19:55:45 +00:00
parent d0deb1a150
commit 57c00a20c5
1 changed files with 50 additions and 21 deletions
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lix/libutil/async.hh
+50 -21
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@@ -4,6 +4,7 @@
#include "lix/libutil/error.hh"
#include "lix/libutil/result.hh"
#include "lix/libutil/signals.hh"
#include <exception>
#include <future>
#include <kj/async-io.h>
#include <kj/async.h>
@@ -109,30 +110,58 @@ T runAsyncUnwrap(Result<T> t)
{
return std::move(t).value();
}
[[noreturn]]
inline void rethrow_async_exception_as_lix(
std::optional<std::string> context, std::source_location loc = std::source_location::current()
)
{
try {
throw; // NOLINT(lix-foreign-exceptions)
} catch (BaseException & e) {
e.addAsyncTrace(loc, context);
throw;
} catch (kj::Exception & e) { // NOLINT(lix-foreign-exceptions)
Error fe{e.getDescription().cStr()};
fe.addAsyncTrace(loc, context);
throw fe;
} catch (...) {
auto fe = ForeignException::wrapCurrent();
fe.addAsyncTrace(loc, context);
throw fe;
}
}
inline ErrorInfo wrap_exception_as_lix(
std::exception_ptr ex,
std::optional<std::string> context = std::nullopt,
std::source_location loc = std::source_location::current()
)
{
try {
std::rethrow_exception(ex);
} catch (BaseError & e) {
return e.info();
} catch (std::exception & e) { // NOLINT(lix-foreign-exceptions)
return {lvlError, HintFmt("%s", Uncolored(e.what()))};
} catch (...) {
return {lvlError, HintFmt("unknown exception")};
}
}
}
}
#define LIX_TRY_AWAIT_CONTEXT_MAP(_l_ctx, _l_map, ...) \
({ \
auto _lix_awaited = (_l_map) (co_await (__VA_ARGS__)); \
if (_lix_awaited.has_error()) { \
try { \
_lix_awaited.value(); \
} catch (::nix::BaseException & e) { \
e.addAsyncTrace(::std::source_location::current(), _l_ctx()); \
throw; \
/* NOLINTNEXTLINE(lix-foreign-exceptions) */ \
} catch (::kj::Exception & e) { \
::nix::Error fe{e.getDescription().cStr()}; \
fe.addAsyncTrace(::std::source_location::current(), _l_ctx()); \
throw fe; \
} catch (...) { \
auto fe = ::nix::ForeignException::wrapCurrent(); \
fe.addAsyncTrace(::std::source_location::current(), _l_ctx()); \
throw fe; \
} \
} \
::nix::detail::materializeResult(std::move(_lix_awaited)); \
#define LIX_TRY_AWAIT_CONTEXT_MAP(_l_ctx, _l_map, ...) \
({ \
auto _lix_awaited = (_l_map) (co_await (__VA_ARGS__)); \
if (_lix_awaited.has_error()) { \
try { \
_lix_awaited.value(); \
} catch (...) { \
::nix::detail::rethrow_async_exception_as_lix(_l_ctx()); \
} \
} \
::nix::detail::materializeResult(std::move(_lix_awaited)); \
})
#define LIX_TRY_AWAIT_CONTEXT(_l_ctx, ...) \