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feat: EXT-007 P2P message history gossip

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After hello verification, the connecting peer sends history_request to
the first peer it meets (one per room, no fan-out). The responder queries
SQLite and replies with a history_chunk. Received history is stored via
INSERT OR IGNORE (mid dedup) and emitted as history_loaded IPC events.

- proto: MsgHistoryRequest/Chunk types, HistoryEntry, EvtHistoryLoaded,
  ComputeMsgID (sha256 content-addressed ID), MsgID field on ChatMessage
- store: ALTER TABLE ADD COLUMN msg_id + unique index migration (idempotent);
  RecentMessagesSince query (msg_id IS NOT NULL filter); msg_id persisted on save
- mesh: RequestHistoryFrom, HandleHistoryRequest, HandleHistoryChunk methods;
  historyRequested/historyFirstPeer state to ensure single-peer requests
- peer: dispatch history_request/history_chunk; RequestHistoryFrom after hello;
  stamp MsgID on incoming chat messages
- ipc: stamp MsgID on outgoing group chat messages
- EXTENSIONS.md: EXT-007 documented

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Fredrik Johansson
2026-06-28 23:08:17 +02:00
parent 1c73f1b1ef
commit 7c3cedc549
6 changed files with 322 additions and 35 deletions
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19
internal/mesh/peer.go
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@@ -197,6 +197,8 @@ func handleDCMessage(data []byte, from proto.PeerID, localID *crypto.Identity, m
})
// Tell the new peer about everyone we can currently see.
go m.sendGossipTo(from)
// Request message history from this peer (EXT-007).
go m.RequestHistoryFrom(from)
return
}
@@ -212,11 +214,12 @@ func dispatchPeerMessage(msg proto.PeerMessage, from proto.PeerID, m *Mesh) {
switch msg.Type {
case proto.MsgChat:
chat := &proto.ChatMessage{
Mid: midOrRandom(msg.Mid),
From: from,
Room: msg.Room,
Text: msg.Text,
Ts: msg.Ts,
Mid: midOrRandom(msg.Mid),
MsgID: proto.ComputeMsgID(from, msg.Room, msg.Ts, msg.Text),
From: from,
Room: msg.Room,
Text: msg.Text,
Ts: msg.Ts,
}
m.SaveMessage(chat)
m.Emit(proto.IpcMessage{Type: proto.EvtMessageReceived, Message: chat})
@@ -298,6 +301,12 @@ func dispatchPeerMessage(msg proto.PeerMessage, from proto.PeerID, m *Mesh) {
}
}
log.Printf("mesh: gossip from %s: %d hints, %d new", from.Short(), len(msg.Gossip.Peers), newPeers)
case proto.MsgHistoryRequest:
go m.HandleHistoryRequest(from, msg.Room, msg.Since, msg.Limit)
case proto.MsgHistoryChunk:
go m.HandleHistoryChunk(msg.Room, msg.History)
case proto.MsgPing:
log.Printf("mesh: ping from %s", from.Short())
case proto.MsgPong: