refactor(framing): replace Sv2Frame dual-Option fields with FrameBody enum#2128
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… enum (fixes stratum-mining#2111) Eliminates the dual-Option pattern (payload + serialized) in Sv2Frame by introducing a type-safe FrameBody enum (Payload(T) | Serialized(B)). This removes 3 'Impossible state' panic branches from serialize(), encoded_length(), and makes the internal state impossible by construction. Also fixes stratum-mining#2112: get_header() now returns Header directly (always present). Fixes stratum-mining#2113: HandShakeFrame::from_bytes() now returns Self directly (always succeeded, Result was unnecessary). All 9 tests pass (3 framing + 6 codec, default + with_buffer_pool).
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Fixes #2111, #2112, #2113
Summary
Replaces
Sv2Frame<T, B>'s dualOption<T>+Option<B>fields with a type-safeFrameBody<T, B>enum (Payload(T) | Serialized(B)). This makes the invariant that exactly one of payload/serialized is present impossible to violate by construction, eliminating 3panic!("Impossible state")branches.Changes
Core refactor (fixes #2111)
FrameBody<T, B>enum withPayload(T)andSerialized(B)variantsSv2Frame<T, B>now uses a singlebody: FrameBody<T, B>fieldserialize(),encoded_length()are now exhaustive matches (no panic branches)map()updated to match on body variantsAPI soundness (fixes #2112)
Sv2Frame::get_header()now returnsHeaderdirectly (wasOption<Header>— always returnedSome)API soundness (fixes #2113)
HandShakeFrame::from_bytes()now returnsSelfdirectly (wasResult<Self, isize>— always returnedOk)Testing
All 9 tests pass: