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New next/kernel/follower_graph.erl is the Erlang-fun stand-in for
the genesis follower-graph.sx projection body, mirroring the
shape of actor_state.erl and define_registry.erl.
State shape (substrate has no maps, so a proplist):
[{ActorId, [{following, [PeerId, ...]},
{followers, [PeerId, ...]},
{pending_outbound, [PeerId, ...]},
{pending_inbound, [PeerId, ...]}]}, ...]
Fold rules per design §13.2:
Follow{actor: A, object: B}
add B to A.pending_outbound
add A to B.pending_inbound
Accept{actor: B, object: Follow{A->B}}
A moves from B.pending_inbound -> B.followers
B moves from A.pending_outbound -> A.following
Reject{actor: B, object: Follow{A->B}}
clear A from B.pending_inbound, B from A.pending_outbound
Undo{actor: A, object: Follow{A->B}}
drop A<->B from every list on either side
only the Follow's original actor may Undo it
Edge cases handled:
- self-follow (alice -> alice) is a no-op
- duplicate Follow is idempotent (list sets)
- Accept/Reject/Undo whose :object isn't a Follow proplist
passes through
- Undo by the wrong actor (carol Undoing Follow{alice->bob})
is a no-op
Public API:
new/0, lookup/2, actors/1
following/2, followers/2,
pending_outbound/2, pending_inbound/2
is_following/3, has_follower/3,
is_pending_outbound/3, is_pending_inbound/3
fold/2, fold_fn/0
fold_fn/0 returns the standard 2-arity Erlang fun for
projection:start_link/3 (same plug shape as actor_state and
define_registry).
Local find_keyed/set_keyed/contains/remove_member helpers — no
lists:keyfind/keymember/member in this substrate (same gap as
Step 1a/2b/5a/5c).
18/18 in next/tests/follower_graph.sh covering all four verbs,
predicates, edge cases (self-follow, duplicate Follow, untyped
activity, non-Follow :object, wrong-actor Undo).
Step 6b wires this into the inbox handler so a peer Follow lands,
fires auto-Accept publish (open-world policy per §13.2; manual
moderation deferred to v3).
Conformance 761/761. 130/130 across 9 Step-6-adjacent suites
(inbox, inbox_bucket, inbox_pipeline, inbox_peer_resolution,
actor_state_pure, define_registry_pure, projection_pure,
nx_kernel_multi, smoke_app_pure).