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Request responses are initialized with a main protocol name, and optional protocol names as a fallback. Running litep2p in kusama as a validator has surfaced a `debug_asserts` coming from the sync component: https://github.com/paritytech/polkadot-sdk/blob/3906c578c96d97a8a099a4bdac4685acbe375a7c/substrate/client/network/sync/src/strategy/chain_sync.rs#L640-L646 The issue is that we initiate a request-response over the main protocol name `/genesis/sync/2` but receive a response over the legacy procotol `ksm/sync/2`. This behavior is correct because litep2p propagates to the higher levels the protocol that responded. In contrast, libp2p provides the main protocol name regardless of negotiating a legacy protocol. Because of this, higher level components assume that only the main protocol name will respond. To not break this assumption, this PR alings litep2p shim layer with the libp2p behavior. Closes: #6581 --------- Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> Co-authored-by: Dmitry Markin <dmitry@markin.tech> (cherry picked from commit 2a0b268)
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