Bring the immutable-state single-store change onto the Noise XX line.
The shared NodeContext is now the sole store; this merge applies the
next-only adaptations the master-side change couldn't carry:
- Remove node_profile from the Node struct (next-only field) so it lives
solely in NodeContext; migrate its readers (tree/bloom/discovery/
handshake negotiation) onto the node_profile() accessor. The two FMP
negotiation sites hoist node_profile() into a local to avoid borrowing
&self while a connection is mutably borrowed.
- leaf_only sets both is_leaf_only and node_profile via the context swap.
- Preserve the XX handshake/rekey structure (no identity-in-msg1; XX/XK
initiator/responder constructors) while applying the startup_epoch()
accessor migration.
- Tests: route profile selection through a make_test_node_with_profile
helper (profile is immutable, set via Config flags) instead of poking
the removed field.
cargo test --lib 1369/0; clippy -D warnings and release build clean.
Remove the duplicated immutable fields (config, identity, startup_epoch,
started_at, is_leaf_only, max_connections/peers/links) from the Node
struct so the Arc<NodeContext> bundle is the single source of truth.
Previously Node owned these fields and a parallel context copy, kept in
lockstep by rebuild_context() at every mutation site — pure overhead that
existed only because of the duplication.
- Replace rebuild_context() with replace_context(): a clone-edit-swap of
the whole Arc. The per-instance context stays immutable; mutation swaps
the Arc. This is the sole runtime mutation path (constructors, leaf_only,
update_peers).
- Add Copy-returning accessors startup_epoch() and max_connections()/
max_peers()/max_links(); migrate the remaining direct field readers onto
the accessors. node_addr()/npub()/Debug now read identity/is_leaf_only
from the context.
- update_peers reads the pre-update peer set from the live context Arc
before building a fresh Config + context and swapping — preserving the
read-before-write ordering its mutation-window test depends on.
- Remove the test-only set_max_* setters; tests set the limits on Config at
construction instead (new make_node_with_max_peers/links helpers).
- Add a ci-local guard that fails if the Node struct re-declares a bundled
field, so the single-store invariant can't silently regress.
cargo test --lib 1291/0; clippy -D warnings and release build clean.
Store node counters in an atomic metric registry read through &self, and
introduce a shared NodeContext bundle holding the effectively-immutable
fields (config, identity, startup epoch, node profile, capability limits).
Source the immutable config and identity reads across the receive hot
path, the XX handshake/session/rekey state machines, and the discovery,
tree, bloom, retry, and lifecycle modules through the context accessors.
Includes the bloom delta/full/NACK/resize and byte-total counters in the
registry. The Node fields and the context are rebuilt in lockstep at every
mutation site.
Store node counters in an atomic metric registry read through &self, and
introduce a shared NodeContext bundle holding the effectively-immutable
fields (config, identity, startup epoch, capability limits). Source the
immutable config and identity reads across the receive hot path, the
handshake/session/mmp/encrypted state machines, and the discovery, tree,
bloom, retry, and lifecycle modules through the context accessors rather
than direct field reads. The Node fields and the context are rebuilt in
lockstep at every mutation site.
Johnathan Corgan