* wip
* batch processing of forward packets
* tmp: additional metrics for remote node
* fixed incorrect prometheus metric registration
* unified runtime metrics
* unify mixnet client metrics
* packet forwarding cleanup
* add batching for emptying the delay queue
* cleanup client io loop
* feat(nym-node): reap idle mixnet connections (ingress + egress)
Close mixnet connections that sit with no traffic past a configurable idle period (mixnet.debug.connection_idle_timeout, default 5min, 0 disables) to bound lingering tokio tasks/sockets.
Ingress handle_stream is read-only, so a silently-gone peer (NAT drop, crash without FIN, half-open) never triggers FIN/RST and the task would block on .next() forever; a new idle select arm closes it (the post-loop replay flush still runs, so nothing is stranded). Egress run_io_loop gets the symmetric arm keyed on last_send; on close EvictOnDrop clears the cache entry and the next packet transparently reconnects.
Adds a cumulative nym_node_network_idle_closed_ingress_mixnet_connections counter; egress reaping is observed via the existing active-egress gauge plus an exit_reason=idle_timeout log.
* downgrade sysinfo
* refactor(nym-node): split PacketForwarder into router + delay-queue tasks
Split the single PacketForwarder task into two concurrently-scheduled tasks connected by a bounded handoff channel, so intake and delayed-release no longer block each other.
PacketRouter (router.rs) is the intake task: sole consumer of the ingress channel, it applies the routing filter and either forwards zero/already-elapsed-delay packets directly or hands delayed ones to the delay task. Its per-packet work is sub-µs, so new packets no longer wait behind delayed-release processing (collapses the ForwarderQueue tail).
DelayForwarder (delay.rs) owns the NonExhaustiveDelayQueue exclusively (it can't be shared by reference). Its run loop services BOTH branches on every wakeup - draining pending inserts first to bring the queue current, then flushing everything now due - so the biased select can't let releases and inserts starve each other, and a freshly-arrived-but-already-due packet releases in the same pass (marginally improving DelayQueueOverrun).
The mixnet client is shared as Arc<C>; handoff-channel overflow is dropped as an egress drop rather than blocking, keeping intake decoupled from release.
* feat(nym-node): bound egress flush with a write timeout
Cap how long a single egress batch flush may block on a congested peer socket (mixnet.debug.connection_write_timeout, default 500ms, 0 disables), so a slow peer can no longer back this connection's egress queue up into the multi-second range - the root of the EgressQueue and SocketWrite tails.
A single timeout is treated as transient congestion: the un-fed tail of the batch is abandoned but the connection is retained. This is sound because NoiseStream::poll_write encrypts and buffers each frame synchronously, so a cancelled flush leaves the noise transport nonce-consistent and a later flush resumes the byte stream in order - so a momentary spike costs no re-handshake. Only MAX_CONSECUTIVE_WRITE_TIMEOUTS (3) timeouts in a row, i.e. a persistently congested peer, tears the connection down (it reconnects on the next packet); a successful flush resets the counter.
Buffer-size tuning (maximum_connection_buffer_size) deliberately left for live data.
* revert PacketForwarder split in favour of a single task that clears both channels on wake
Jędrzej Stuczyński
8a93bce32f