From c9c7807bf0f068474ce5c853244bcb392bdfcce3 Mon Sep 17 00:00:00 2001 From: tv Date: Sun, 8 Nov 2026 19:16:10 +0000 Subject: roots: an epoch's root pinned, and named in every handshake Review 2, N7, the care it raised: a joining node's empty document took as the first epoch's root whatever dependency-less change came first, from whichever peer it joined through; the first epoch's ID is all zeros, so nothing pinned it. A remake's epoch has its ID, the snapshot change's hash, which the rules hold its root to. * Every node names its epoch's root in HELLO and HELLO_REPLY (the epoch's ID for a remake's, its genesis change for the first; wire version 45). A node whose document starts from another root of the same epoch refuses the handshake, logging it: another history under the swarm's ID, a forged root or a genesis started again. * A joining node with an empty document takes as its root only the one it was given (--genesis-root, new), else the one its peers name, and none while they name different ones (access::screen::RootPin, kept in Screening across documents): one peer hands it another root only if it is all the joiner hears, or never, with --genesis-root. A root refused is listed with the refused, what builds on it with it. * The genesis node logs the root (`The swarm's root`); GET /admin/epochs shows it (`root`). A genesis started again under a remembered swarm ID used to merge with the nodes of it still running; they now refuse it (another root), and the docs say to join them with seeds instead. The epoch's identity stays as it is (generation 0 all zeros): records and epoch metadata name it so, and every comparison of epochs with them. --- src/swarm/peer/inbound.rs | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'src/swarm/peer/inbound.rs') diff --git a/src/swarm/peer/inbound.rs b/src/swarm/peer/inbound.rs index a7633b3..3ddaf08 100644 --- a/src/swarm/peer/inbound.rs +++ b/src/swarm/peer/inbound.rs @@ -96,6 +96,18 @@ pub(crate) async fn handle_message( return Ok(()); } + // The root its document starts from: another than ours, of our epoch, is another + // history; what a joiner takes as its root follows those named (`swarm::roots`). + match &message { + ParsedMessage::Hello(hello) => { + crate::swarm::roots::heard(state, &peer, epoch, hello.root.as_deref()).await? + } + ParsedMessage::HelloReply(reply) => { + crate::swarm::roots::heard(state, &peer, epoch, reply.root.as_deref()).await? + } + _ => {} + } + remember_peer(state, &peer).await; let run = match &message { -- cgit v1.3.1