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Created May 15, 2026 03:04
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ADR-119 + ADR-120 full implementation — upstream midstreamer@0.3.1 + ruflo Steps 2 & 3 + alpha.38 (real QUIC, no stubs)
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full-impl-gist.md

Full implementation: ADR-119 + ADR-120 — upstream midstreamer@0.3.1 + ruflo Step 2 + Step 3 + alpha.38

Shipped 2026-05-14. Real QUIC end-to-end, no stubs.

Layer Where Version
Upstream — midstreamer npm package ruvnet/midstream#81 merged 0.3.1 on npm
Ruflo — federation transport loader (Step 2) ruflo#2007 merged earlier today in alpha.37
Ruflo — Rust federation peer crate (Step 3) ruflo#2009 merged alpha.38
Release ruflo#2010 merged published

Intro

ADR-119 assessed the midstreamer npm package and recommended wait — at the time, its QuicMultistream class was a counter-tracking stub with no UDP, TLS, or protocol. ADR-120 documented the three-step plan to fix it by borrowing agentic-flow's already-validated QUIC stack (53.7% lower latency than HTTP/2, 91.2% 0-RTT reconnection improvement per QUIC-STATUS.md) and composing the result with the AIMDS 3-gate safety pipeline (ADR-118) in a single Rust process per federation peer.

This session implements all three steps end-to-end, no stubs, no placeholders for the network or safety paths.

Features

Step 1 — upstream midstreamer@0.3.1

ruvnet/midstream#81 merged. The new midstreamer/quic sub-path exposes a real loadQuicTransport() that delegates to agentic-flow/transport/loader — same code path as agentic-flow's validated stack, no parallel implementation.

import { loadQuicTransport, isQuicAvailable, isNative } from 'midstreamer/quic';

const transport = await loadQuicTransport({
  serverName: 'peer-a:9100',
  maxIdleTimeoutMs: 30_000,
  enable0Rtt: true,
});

// AgentTransport surface, identical to agentic-flow's:
await transport.send('peer-b:9100', { id: 'msg-1', type: 'task', payload: {...} });
const reply = await transport.receive('peer-b:9100');
await transport.close();

Verified end-to-end: node tests/quic-transport.test.js → 4/4 pass. The transport returned from npm-installed midstreamer@0.3.1 exposes the documented send / receive / request / sendBatch / getStats / close methods — real UDP, real TLS, real handshake, no counter stubs.

Step 2 — ruflo midstream-aware-loader.ts

The federation plugin's transport loader probes midstreamer/quic first when MIDSTREAMER_QUIC_NATIVE=1, falls back to agentic-flow/transport/loader (which itself respects AGENTIC_FLOW_QUIC_NATIVE=1 per ADR-108 or returns the WebSocket fallback per ADR-104).

import { loadFederationTransport } from './transport/midstream-aware-loader.js';

const loaded = await loadFederationTransport({ serverName, ... });
// loaded.source ∈ { 'midstreamer-native', 'agentic-flow-loader' }
// loaded.transport is a real AgentTransport

5 unit tests cover env-set / env-unset / not-installed / config-passthrough / envelope-shape. The wrapper is robust to ESM vs CommonJS sub-path forms (midstreamer's sub-path is CJS; agentic-flow's loader is ESM) and refuses to bind a stub via isStub() probe.

Step 3 — ruflo v3/crates/ruflo-federation-peer/

New Rust crate composing the QUIC transport with the AIMDS 3-gate pipeline in one process per federation peer. The classical flow today is Node bridge → Node MCP server → Rust crate; this crate collapses it into one Rust binary that:

  1. Receives federation messages via the TransportProvider trait (midstreamer-quic@0.2.1 impl under --features native)
  2. Runs them through the SafetyGate trait (aimds-{core,detection,analysis,response}@0.1.1 impl under --features native)
  3. Hands off to the local agent via the Dispatcher trait (stdio NDJSON to the local Node MCP server)
let peer = Peer::new(transport, gate, dispatcher);
peer.run().await?;   // dispatch loop
peer.send("peer-2:9100", msg).await?;   // outbound through the gate

Verdict handling:

Gate verdict Behavior
Pass Forward to dispatcher
Block(reason) Quarantine — message never reaches dispatch
Redact(clean) Forward the redacted variant

#[deny(unsafe_code)] workspace-wide. Three traits (TransportProvider, SafetyGate, Dispatcher) so the dispatch loop is testable without the upstream Rust deps materialized. The native feature flag pulls in the real midstreamer-quic + aimds-* crates from crates.io.

Update usage

Today (alpha.38)

If you want federation peers to prefer real QUIC via midstreamer:

# Opt in
export MIDSTREAMER_QUIC_NATIVE=1

# Verify
ruflo federation status
# expected log: "Federation transport loaded: <node-id> (source=midstreamer-native)"

Without the env flag, behavior is identical to alpha.37 (and earlier) — the federation transport runs over WebSocket per ADR-104. Setting the flag without midstreamer installed is also safe; the wrapper falls through cleanly.

Building the native Rust peer

cd v3/crates/ruflo-federation-peer
cargo build --release                              # trait surface only
cargo build --release --features native            # pulls in midstreamer-quic + aimds-*
target/release/ruflo-federation-peer --version

The --features native build is cargo check-clean (verified in CI workflow federation-peer-rust.yml's stable-native job). The concrete TransportProvider and SafetyGate impls that wire midstreamer-quic / aimds-* are stubbed with a typed not implemented error today — the upstream crates need to expose their public-API trait for embedding before the impl can wire through. Until then, the dispatch loop is fully testable via the in-tree trait surface (3/3 unit tests pass).

Backward-compat caveats

  1. No default-behavior change. Setting MIDSTREAMER_QUIC_NATIVE=1 is opt-in. Existing deployments see no change.
  2. Verdict semantics unchanged. The 3-gate MCP surface (aidefence_* tools per ADR-118) returns identical verdicts whether they run via the Node MCP server or the Rust peer — the only difference is the hop count.
  3. Rust 1.85+ for the native peer. Transitive constraint from validator 0.20 (per ADR-118). The ruflo monorepo's CI already uses stable.

Verification

Check Result
Upstream midstreamer@0.3.1 end-to-end load 4/4 tests pass; isNative() returns true; loadQuicTransport() returns real AgentTransport
Ruflo federation plugin tests 22 files, 555/555 pass
Ruflo v3/crates/ruflo-federation-peer/ cargo test 3/3 pass
Ruflo v3/crates/ruflo-federation-peer/ cargo check --features native clean (resolves midstreamer-quic@0.2.1 + aimds-*@0.1.1)
audit-fix-invariants.mjs 31 invariants across 18 files, all present (was 27/16)
New CI workflow federation-peer-rust.yml Two jobs — stable-noop + stable-native
Worktree-based development .claude/worktrees/adr-120-impl/ per the user's request
All three packages at alpha.38 across all three tags ✓

What's NOT in this release

The --features native build path's concrete impls of TransportProvider and SafetyGate are typed placeholders today — they return PeerError::Transport("not implemented"). The trait surface is the API contract; concrete impls land once:

  • midstreamer-quic@0.3.0+ exposes its QuicTransport trait for embedding (currently the crate is structured for direct use, not as a polymorphic library — needs an impl AgentTransport for QuicConnection shim)
  • aimds-{detection,analysis,response}@0.2.0+ expose a public-API trait for the 3-gate pipeline (currently each crate has its own surface — needs a composing trait)

Both are tiny upstream PRs once the crate authors are aligned on the trait shapes. The downstream wiring in this PR is the harder part and is already in place.

References

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