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@richard-ramos richard-ramos released this 08 Jun 12:13
c431993

Highlights

  • Connection management gained high/low watermark pruning, peer scoring, protected peers, decaying tags, and composable hard-limit + trimming modes, exposed through SwitchBuilder.withWatermarkPolicy, withPeerScoring, withMaxConnections, and withMaxInOut.
  • LPProtocol now supports incoming/outgoing stream budgets, including total and per-peer limits.
  • Service Discovery landed, including advertiser, registrar, discoverer, signed extended peer records, routing-table management, component tests, and C binding support.
  • C bindings were significantly expanded with configurable transports and muxers, Kademlia validators/selectors, circuit relay, AutoNAT, peerstore APIs, service discovery APIs, and custom protocol handlers.
  • SwitchBuilder and connection management were reworked around connection limits, watermarks, peer scoring, address policies, announced addresses, NAT configuration, hole punching, and Identify Push.
  • GossipSub gained extension-based ping/pong, preamble, and partial-message support, H/M/L message priorities, slow-peer scoring controls, improved queue behavior, and broader interoperability coverage.
  • Kademlia gained metrics, configurable record TTLs, provider rejection/spillover support, optional bootstrapping disablement, privacy-preserving connection-status hiding, and several race fixes.
  • Transport and stream handling improved with QUIC multi-address listening, stream reset support, stricter transport start errors, WebSocket accept concurrency fixes, and better cancellation propagation.
  • Crypto and dependency handling were hardened with a libp2p-owned Rng abstraction, BoringSSL wiring, deterministic Ed25519 keys from seed, RSA key-size validation, and refreshed Nim/Nimble/Nix dependency metadata.
  • New network simulation tooling, Gossipsub/transport unified-testing interop helpers, and many flaky-test fixes were added.
  • Identify Push support was added as a switch service, enabled by default in SwitchBuilder and configurable with withIdentifyPusher, so peers can be notified when local peer information changes.
  • Address announcement support improved with withAnnouncedAddresses, withPrivateAddressFilter.
  • PubSub and stream write paths now use sink in several hot paths to reduce message/buffer copies.

Breaking changes

  • The minimum supported Nim version is now 2.2.4. The tested versions are 2.2.4 and 2.2.10.
  • The Mix protocol was extracted from this repository into logos-co/nim-libp2p-mix. Imports under libp2p/protocols/mix, Mix tests/examples/docs, MixPubKeyBook, and the libp2p_mix_* C APIs were removed.
  • Public APIs that used std/options.Option now use results.Opt. Migrate some(...) / none(...) call sites to Opt.some(...) / Opt.none(...) where required.
  • Public RNG-facing APIs now use the libp2p Rng type instead of ref HmacDrbgContext / var HmacDrbgContext. Use newRng() or wrap existing BearSSL RNG state with the compatibility helper where needed.
  • newStandardSwitch and newStandardSwitchBuilder were removed from the public API. Use SwitchBuilder.new()...build() instead.
  • Manual switch construction changed: newSwitch was removed, and SwitchBuilder is now the supported stable path for building switches.
  • SwitchBuilder.withServices was removed. Service is now an internal switch lifecycle abstraction; externally created background work should be managed by the application. Service methods changed as well: setup is synchronous and may raise ServiceSetupError, run was renamed to start, and lifecycle methods no longer return bool.
  • Connection limit configuration changed. withMaxIn and withMaxOut were removed; use withMaxInOut(...), withMaxConnections(...), or withConnectionLimits(...). Also, maxConnsPerPeer now enforces the configured value exactly; custom values may allow one fewer connection than before because an off-by-one bug was fixed.
  • ConnManager.new now takes structured limit/watermark/scoring configuration instead of the old maxConnections, maxIn, and maxOut argument set.
  • Several public buffer APIs now take sink seq[byte] and may consume buffers with move(...) to reduce copies, including PubSub publish and stream/protobuf write paths. Normal call sites usually continue to compile, but custom overrides, wrapper proc types, or code that reuses/mutates a buffer after passing it to libp2p may need updates.
  • PubSub/GossipSub priority APIs changed from boolean priority flags to MessagePriority.High, MessagePriority.Medium, and MessagePriority.Low. Deprecated send / broadcast overloads taking isHighPriority were removed.
  • GossipSubParams.maxNumElementsInNonPriorityQueue was removed. Use maxMediumPriorityQueueLen and maxLowPriorityQueueLen.
  • PubSub custom connection naming was changed to stream naming: for example useCustomConn became useCustomStream, and custom connection callbacks became custom stream callbacks.
  • GossipSub preamble and ping/pong behavior moved to the extension system. Do not rely on -d:libp2p_gossipsub_1_4; configure the relevant extension through GossipSubParams.
  • LPProtocol stream limits changed. maxIncomingStreams was replaced by total/per-peer incoming and outgoing stream limit fields: maxIncomingStreamsTotal, maxIncomingStreamsPerPeer, maxOutgoingStreamsTotal, and maxOutgoingStreamsPerPeer.
  • Kademlia module/type names changed in a few places: routingtable was renamed to routing_table, and TimeStamp was renamed to Timestamp.
  • Kademlia now hides connection status by default when encoding peer records. Pass the relevant config/encode option if your application intentionally needs the old behavior.
  • Kademlia locally stored value records now expire after the configured TTL. Code relying on indefinite local PUT_VALUE retention should set an appropriate recordExpirationInterval.
  • Transport start behavior is stricter. TCP, WebSocket, QUIC, and Tor transports now raise TransportStartError on unsupported or non-wire addresses instead of silently skipping or accepting them.
  • RSA key handling is stricter: imported RSA keys below 2048 bits and RSA keys above 4096 bits are rejected.
  • The C binding ABI changed. libp2p_config_t no longer uses the old flags bitmask, stream callbacks were renamed from connection-oriented names to stream-oriented names, Mix APIs were removed, and users should rebuild against the v2 header.

Switch creation

newStandardSwitch and newStandardSwitchBuilder were removed. Use SwitchBuilder:

let switch = SwitchBuilder
  .new()
  .withAddress(MultiAddress.init("/ip4/127.0.0.1/tcp/0").tryGet())
  .withTcpTransport()
  .withMplex()
  .build()

Options API

Public APIs moved from std/options.Option to results.Opt:

# before
publishParams = some(PublishParams(...))

# after
publishParams = Opt.some(PublishParams(...))

RNG API

Public RNG-facing APIs now use libp2p Rng:

# before
let rng: ref HmacDrbgContext = newRng()

# after
let rng: Rng = newRng()

Connection limits

Use structured connection limit configuration:

# before
.withMaxIn(30)
.withMaxOut(20)

# after
.withMaxInOut(30, 20)

Pubsub sink/move

var data = @[byte 1, 2, 3]
discard await pubsub.publish(topic, move(data))
# Do not read or mutate `data` after this point.

What's Changed

  • feat(kad): DHT Metrics by @SionoiS in #2111
  • chore(mix): truncate exponential delay to practical limits based on probablity by @chaitanyaprem in #2120
  • fix(cbind): various by @richard-ramos in #2123
  • chore: resolve exception in logos -delivery by @darshankabariya in #2122
  • fix(cbind): protocol mounting duplication by @richard-ramos in #2128
  • chore(cbind): remove duplicate flags by @gmelodie in #2130
  • feat(cbind): kad validator and selectors by @richard-ramos in #2129
  • chore: bump lsquic by @richard-ramos in #2125
  • feat(cbind): withAddresses, multiplexers by @gmelodie in #2131
  • feat(cbind): add circuit relay, autonat by @gmelodie in #2137
  • feat(cbind): add transport, conn limits by @gmelodie in #2135
  • test(interop): add partial message interop with go peer by @vladopajic in #2119
  • test(interop): fix partial message flakines by @vladopajic in #2140
  • refactor(gossipsub): convert ping pong to extensions by @vladopajic in #2144
  • chore: harmonized proc name for no-op completed future by @rikettsie in #2145
  • fix(cbind): libp2p_kad_random_records - add missing import by @rlve in #2149
  • chore(ai): add .github/copilot-instructions.md for coding agent onboarding by @Copilot in #2151
  • test: hardening and cosmetics by @vladopajic in #2150
  • chore: add msys+gcc build target for windows by @richard-ramos in #2133
  • test: use rng instead of newRng by @vladopajic in #2154
  • fix(kad): update async schedule of findrandom by @SionoiS in #2142
  • fix(kad): handle dial failed error early by @gmelodie in #2147
  • feat(cbind): add circuit relay client by @rlve in #2146
  • chore: fix hint XCannotRaiseY by @vladopajic in #2157
  • chore: fix some hints XDeclaredButNotUsed by @vladopajic in #2155
  • chore: avoid using deprecated callbacks of newDatagramTransport and createStreamServer by @vladopajic in #2160
  • chore: avoid using deprecated type ByteAddress by @vladopajic in #2158
  • chore: fix depracated warning for Future.cancel() by @vladopajic in #2161
  • chore: utilize newFutureCompleted by @vladopajic in #2159
  • refactor: use results lib instead of options lib by @vladopajic in #2162
  • chore: make UnreachableCode warnings as error by @vladopajic in #2165
  • test(mix): component tests by @rlve in #2167
  • test(mix): organise component tests by @rlve in #2175
  • test(mix): unit tests by @rlve in #2176
  • refactor(preamblestore): simplifying interface by @vladopajic in #2177
  • test(mix): misc by @rlve in #2178
  • test(gossipsub): improve test "mesh is rebalanced during heartbeat - opportunistic grafting" by @vladopajic in #2183
  • refactor(gossipsub): add preamble extension by @vladopajic in #2179
  • chore(extensions): more generic missbehvior callback by @vladopajic in #2187
  • chore(extensions): add penalty cases by @vladopajic in #2188
  • chore: add with* constructors to messages by @vladopajic in #2191
  • test(interop): update transport workflow and support unified-testing by @rlve in #2185
  • chore: switch update_copilot_instructions workflow to claude-3-7-sonnet by @Copilot in #2205
  • chore: bump chronos, jwt, bearssl, testutils by @nitely in #2199
  • feat(quic): add support for listening on many addresses by @vladopajic in #2193
  • chore: reduce log level for noisy "too many channels created" log by @richard-ramos in #2197
  • test(interop): update hp script by @rlve in #2189
  • fix(kad): get providers aggregates race by @gmelodie in #2204
  • fix(mix): delay correlation risks by @chaitanyaprem in #2198
  • test(multiaddress): getField protobuf tests by @rlve in #2195
  • chore(test): utilize rng() template by @vladopajic in #2211
  • refactor(mix): add Delay type by @vladopajic in #2226
  • fix: nil pointer dereference issues caused when sha256 is used in ref object by @vladopajic in #2216
  • test(transport): inconsistent start behaviour by @rlve in #2229
  • fix(autonatv2): reachability greater than expected by @gmelodie in #2215
  • chore: remove semaphore by @vladopajic in #2056
  • fix(autonat): cleanup duplicated services on tests by @gmelodie in #2232
  • fix(mix): avoid creation of random by @vladopajic in #2228
  • feat: create Ed25519 key from seed by @rlve in #2239
  • chore(service-disco): add protobuf messages and utilities by @gmelodie in #2237
  • chore(connmanager): performance and cosmetic improvements by @vladopajic in #2242
  • chore: remove unused ngtcp2 dependency from pinned list by @richard-ramos in #2244
  • test(interop): GossipSub - core instructions (part 1) by @rlve in #2240
  • chore(crypto): add pick utilities by @gmelodie in #2245
  • feat(gossipsub): extend message priorities to H/M/L by @richard-ramos in #2241
  • test(mix): fix flaky test "rate limit exceeded - message rejected at intermediate node" by @vladopajic in #2255
  • chore(future): add cancelSoon by @vladopajic in #2250
  • chore(crypto): reduce memory allocations for ecnist keys by @Copilot in #2251
  • chore(service-disco): add service discovery by @gmelodie in #2246
  • test(gossipsub): fix flaky test when peers should be dropped in same heatbeat as publish by @vladopajic in #2259
  • test(switch): fix flaky test causing "mount unstarted protocol" errors by @Copilot in #2257
  • test(transports): fix flaky test "server writes after EOF" by @vladopajic in #2263
  • fix: add asyncSleep before dial in "mount unstarted protocol" test to fix Windows flakiness by @Copilot in #2271
  • chore(connmanager): add muxer store by @vladopajic in #2247
  • fix(autotls): letsencrypt challenge type change by @gmelodie in #2262
  • feat(switchbuilder): add withHolePunching by @SionoiS in #2265
  • test(interop): GossipSub - partial messages (part 2) by @rlve in #2249
  • feat(service-disco): add ipTree, signatures by @gmelodie in #2267
  • chore(deps): use lsquic nimble package by @richard-ramos in #2279
  • chore: update API stability and experimental extensions section by @richard-ramos in #2277
  • feat(service-disco): routing table manager by @gmelodie in #2274
  • test(transports): replace sleepAsync with write loop in "server writes after EOF" by @Copilot in #2273
  • chore(service-disco): use ServiceId type by @gmelodie in #2290
  • refactor(connmanager): constructors by @vladopajic in #2282
  • fix(mix): track and cancel handleMixMessages futures by @Copilot in #2272
  • feat(builder): withPrivateAddressFilter by @richard-ramos in #2286
  • feat(quic): add getStreams, close session after handle exit by @fcecin in #2280
  • feat(gossip): reduce score of slow peers by @richard-ramos in #2269
  • chore: remove trailing space from copyright header by @Copilot in #2299
  • fix(gossipsub): flaky scoring test by @gmelodie in #2289
  • chore: update copilot instructions to reflect latest repository state by @Copilot in #2297
  • feat(connmanager): watermark by @vladopajic in #2284
  • feat: extend libp2p_network_bytes and agents traffic metrics to all transports by @Copilot in #2295
  • chore: add code formatting guidelines to instructions by @richard-ramos in #2298
  • fix(service-disco): add missing tables import by @gmelodie in #2302
  • feat(service-disco): add registrar by @gmelodie in #2275
  • test(gossipsub): extensions race condition + fix by @rlve in #2288
  • feat: network simulation by @richard-ramos in #2294
  • fix: raise exception rather than defect on malformed DNS response by @jm-clius in #2300
  • feat(service-disco): add advertiser by @gmelodie in #2285
  • chore(copilot): add more instructions by @vladopajic in #2307
  • chore: bump lsquic by @richard-ramos in #2311
  • test(gossipsub): partial messages with fanout bug + fix by @rlve in #2310
  • fix(transports): unify start proc error behavior - raise TransportStartError for all invalid addresses by @Copilot in #2253
  • feat(mix): cover traffic with constant rate by @chaitanyaprem in #2243
  • feat(service-disco): add discoverer by @gmelodie in #2306
  • chore: bump deps by @richard-ramos in #2312
  • test(interop): GossipSub - fixes (part 3) by @rlve in #2313
  • chore(service-disco): add component tests by @gmelodie in #2308
  • feat(connmanager): ephemeral tags by @vladopajic in #2316
  • feat(cbind): register custom protocol handlers by @richard-ramos in #2314
  • chore: add local testing addr policy by @SionoiS in #2315
  • chore(service-disco): various fixes by @SionoiS in #2320
  • chore(service-disco): add peer table and store update side effect by @SionoiS in #2323
  • fix(service-disco): registrar wait formula ceiling by @SionoiS in #2326
  • fix(floodsub): increase timeout for large message transfer in FloodSub message size validation 2 by @Copilot in #2331
  • feat(connmanager): composable modes by @vladopajic in #2325
  • chore(connmanager): cosmetics by @vladopajic in #2327
  • feat(service-disco): add missing API functions by @gmelodie in #2321
  • chore(cbind): add service discovery by @gmelodie in #2324
  • chore(cbind): add service disco headers by @gmelodie in #2338
  • chore(examples): add connection manager examples by @vladopajic in #2332
  • chore(connmanager): consts tidy by @vladopajic in #2329
  • feat(mix): add coverRateFraction config to cover traffic by @chaitanyaprem in #2322
  • test: correct lower bound tests by @tinniaru3005 in #2337
  • chore: remove runAfter by @vladopajic in #2355
  • feat(cbind): add peerstore by @gmelodie in #2346
  • fix(kad): race in randomFind by @gmelodie in #2345
  • chore(examples): add peer scoring examples by @vladopajic in #2356
  • test(interop): unified-testing helpers by @rlve in #2333
  • chore: removing .public. pragma by @vladopajic in #2365
  • chore(examples): tidy by @vladopajic in #2362
  • fix(docs): add root index.html redirect to fix 404 on GitHub Pages by @Copilot in #2358
  • refactor(connmanager): add limits config by @vladopajic in #2363
  • feat(pubsub): reduce publish-time message copies with sink by @richard-ramos in #2368
  • feat: add dial back addr in StatusAndConfidenceHandler by @2-towns in #2354
  • test(interop): perf by @rlve in #2364
  • feat: reset stream by @richard-ramos in #2283
  • fix(service-disco): reduce chance of flaky test by @SionoiS in #2367
  • chore: update NIMBLE_COMMIT to version v0.99.1 by @jmgomez in #2348
  • chore(service-disco): refactor registrar time types by @SionoiS in #2334
  • chore(connmanager): naming improvements by @vladopajic in #2372
  • test(gossipsub): eliminate timing-sensitive waits from scoring tests by @Copilot in #2371
  • fix(connmanager): max conns per peer limit by @vladopajic in #2344
  • chore: removing deprecated things by @vladopajic in #2366
  • fix: truncated identify: decoded message log due to unbounded address list by @Copilot in #2374
  • fix: replace generic payload log key with descriptive names in pubsub by @Copilot in #2379
  • chore: move interop ignore items to their own gitignore by @Copilot in #2377
  • feat(kad): hide connection info by @gmelodie in #2361
  • chore(ci): test Nim 2.2.4 and 2.2.10 by @narimiran in #2339
  • fix(pubsub): track pending sends without adding backpressure by @richard-ramos in #2370
  • fix: prevent GossipSub from relaying messages back to original source by @Copilot in #2376
  • chore(service-disco): add ipSimCoefficient by @gmelodie in #2342
  • chore(kad): handle dial failed exception by @gmelodie in #2164
  • feat(kad): add flag to disable bootstrapping by @SionoiS in #2387
  • fix(muxer): accept loop stuck by @gmelodie in #2360
  • fix: propagate shortAgent through wrapped connection chain to restore peer metrics by @Copilot in #2389
  • refactor: unify default DNS servers under dnsresolver by @Copilot in #2390
  • test(interop): unified testing refactor by @rlve in #2373
  • chore: use multicodec CSV to generate list of codecs by @Copilot in #2392
  • chore(service-disco): added debug logging by @SionoiS in #2388
  • chore: run autobump and documentation as daily jobs instead of on every push to master by @Copilot in #2393
  • chore: test ORC memory management by @narimiran in #2148
  • ci: add runnableExamples check and daily CI workflow by @Copilot in #2401
  • test(interop): transport fix by @rlve in #2405
  • chore: remove old nim hacks by @gmelodie in #2396
  • fix: random (rng) arguments initialization in constructors by @Copilot in #2398
  • fix(autotls): withAutotls independent ordering by @gmelodie in #2410
  • feat: boringssl by @richard-ramos in #2411
  • test: stabilize flaky Heartbeat::catch up on slow heartbeat timing assertion by @Copilot in #2414
  • test(service-disco): refactor utils by @rlve in #2409
  • feat(service-disco): Local registrar access by @SionoiS in #2406
  • feat: identify pusher by @vladopajic in #2412
  • test(service-disco): clean up and improve unit/component separation by @rlve in #2415
  • feat(kad): add provider rejection and spillover by @gmelodie in #2394
  • chore: extract mix to logos-co/nim-libp2p-mix by @chaitanyaprem in #2378
  • test(interop): GossipSub - fix message id by @rlve in #2427
  • chore(identify): cosmetics improvment by @vladopajic in #2418
  • refactor(rng): make the rng a libp2p type by @richard-ramos in #2420
  • fix(gossip): make slow peer penalty opt-in by default by @richard-ramos in #2429
  • chore: fix required Nim version and some CI warnings by @narimiran in #2426
  • test(websocket): stabilize WebSocket EOF write assertion in stream transport tests by @Copilot in #2423
  • chore: use >= to choose boringssl dependency by @richard-ramos in #2435
  • test(service-disco): addProvidedService / lookup component tests by @rlve in #2432
  • feat(PeerInfo): add observer by @vladopajic in #2439
  • chore(MultiAddress): memory optimization by @vladopajic in #2428
  • refactor(IdentifyPusher): as Service by @vladopajic in #2440
  • chore: Use protobuf_serialization in RendezVous protocol by @nitely in #2166
  • test: drop untilTimeout and standardize on checkUntilTimeout by @Copilot in #2447
  • test: fix flaky service-discovery test for two advertisers on one service by @Copilot in #2445
  • chore(service-disco): dedupe identical ads by @rlve in #2443
  • chore(service-disco): rename startDiscovering to registerInterest + improve component test by @rlve in #2441
  • fix(kad): table insertion check by @SionoiS in #2434
  • chore: regenerate nix deps by @rlve in #2452
  • chore: drop newStandardSwitch and newStandardSwitchBuilder from public api by @vladopajic in #2442
  • chore: utilize cancelAndWait template by @Copilot in #2451
  • test: simplify makeStandardSwitch and makeStandardSwitchBuilder by @Copilot in #2453
  • test: stabilize Switch::e2e max outgoing connection limits by forcing TCP transport by @Copilot in #2456
  • fix(service-disco): fix misplaced log line by @SionoiS in #2460
  • test(service-disco): advertise and registration response by @rlve in #2457
  • fix(peerstore): reset identify stream on cancellation by @richard-ramos in #2459
  • test(service-disco): lookup component by @rlve in #2461
  • test(service-disco): error handling component by @rlve in #2464
  • fix(ws): process pending handshakes concurrently by @richard-ramos in #2359
  • refactor(Switch): Service lifecycle by @vladopajic in #2462
  • feat(peerstore): address TTL by @gmelodie in #2425
  • chore(deps): bump nim-websock to >= 0.4.0 by @richard-ramos in #2465
  • chore: makefile instead of nimble by @gmelodie in #2454
  • test(service-disco): client mode + one register component by @rlve in #2463
  • test(service-disco): misc component by @rlve in #2467
  • test(Noise): cosmetics by @vladopajic in #2472
  • chore(PeerInfo): cosmetics by @vladopajic in #2473
  • feat(kademlia): expire value records after configurable TTL by @Copilot in #2397
  • chore(SwitchBuilder): build() proc cleanup by @vladopajic in #2466
  • chore(SwitchBuilder): avoid braking building chain by @vladopajic in #2476
  • feat(nat): announcedAddrs by @gmelodie in #2483
  • chore: better names for streams and connections by @richard-ramos in #2482
  • test(service-disco): validateRegisterMessage + message size by @rlve in #2480
  • fix(websocket): avoid asyncSpawn by @Copilot in #2471
  • chore(SwitchBuilder): drop withServices by @vladopajic in #2475
  • chore(SwitchBuilder): gracePeriod disabled by default by @vladopajic in #2486
  • test(service-disco): non-32-byte keys + misc component by @rlve in #2488
  • fix(rsa): reject imported keys below 2048 bits by @richard-ramos in #2491
  • test: improve "one advertiser provides two services - both discoverable" by @Copilot in #2492
  • fix(autotls): parsing failed due to missing enum value by @vladopajic in #2497
  • fix(cancellation): preserve CancelledError in broad handlers by @richard-ramos in #2495
  • fix(rsa): cap max key size by @richard-ramos in #2494
  • test(service-disco): add repro test for #2499 by @rlve in #2500
  • feat(streams): use sink for write buffers by @richard-ramos in #2501
  • feat(pubsub): use sink for RPC buffers by @richard-ramos in #2503
  • feat(nat): NATService skeleton by @gmelodie in #2493
  • fix(service-disco): build advert once to keep adverts byte-identical by @rlve in #2502
  • chore: use protobuf_serialization 0.4.0 by @richard-ramos in #2508
  • feat(protobuf): Use sink in protobuf decode paths by @richard-ramos in #2504
  • chore: remove implicit result variable usage across libp2p source by @Copilot in #2506
  • chore(readme): add Mix Protocol to project list by @vladopajic in #2507
  • chore: remove remaining result keyword usage by @richard-ramos in #2518
  • feat: more sink changes by @richard-ramos in #2517
  • fix(autotls): avoid dns-persist-01 challenge and raise api errors by @vladopajic in #2519
  • chore: remove unnecessary ProveField warning override by @tersec in #2523
  • chore: dcutr protobuf serialization using nim-protobuf-serialization by @moigagoo in #2477
  • feat(LPProtocol): stream limits by @vladopajic in #2522
  • feat: v2.0.0 by @richard-ramos in #2527

New Contributors

Full Changelog: v1.15.3...v2.0.0