EXPERIMENTAL: channel upgrade support#4532

Merged

rustyrussell merged 16 commits intoElementsProject:masterfrom

rustyrussell:guilt/channel-upgrade

Jun 4, 2021

Commits on Jun 3, 2021

gen/impl_template: fix generation of singleton varsize elements.
rustyrussell
committed

Commits on Jun 4, 2021

onchaind: don't rely on knowing option_static_remotekey for unknown commitments.
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onchaind: don't hand redundant commit_num to handle_unknown_commitment.
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onchaind: limp along if we cheat.
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channeld: tweak function to allow testing for pending *uncommitted* changes.
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common/features: helper to pretty-print feature bits.
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channel: import upgrade spec.
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channeld: send next_to_send if EXPERIMENTAL_FEATURES
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channeld: send current features (EXPERIMENTAL_FEATURES)
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channeld: send upgradable types, add logging (EXPERIMENTAL_FEATURES)
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wallet: save thresholds for option_static_remotekey.
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onchaind: handle static_remotekey thresholds.
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channeld: handle upgrade match.
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channeld: set desired_type to upgrade `option_static_remotekey` if not already.
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pytest: test onchaind handles unilateral and penalty txs on either side of upgrade.
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pytest: test that both sides refuse upgrade if not quiescent.
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