feat: implement UEPS packet dispatcher with threat circuit breaker
Implements Phase 4 of the go-p2p task queue. The Dispatcher routes HMAC-verified UEPS packets to registered IntentHandlers by IntentID, enforcing a threat circuit breaker that drops packets with ThreatScore exceeding 50,000 (logged as threat events at WARN level). Design choices: - IntentHandler is a func type (not interface) for lightweight registration - 1:1 mapping of IntentID to handler, replacement on re-register - Threat check fires before intent routing (hostile packets never reach handlers) - Sentinel errors (ErrThreatScoreExceeded, ErrUnknownIntent, ErrNilPacket) - RWMutex protects handler map for concurrent safety Tests: 10 test functions, 17 subtests — 100% dispatcher coverage. Race detector clean. All 102 existing tests continue to pass. Co-Authored-By: Charon <developers@lethean.io>
This commit is contained in:
Claude
parent
de36ce991a
commit
a60dfdf93b
2 changed files with 465 additions and 30 deletions
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@ -1,39 +1,128 @@
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package node
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// pkg/node/dispatcher.go
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import (
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"fmt"
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"sync"
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/*
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func (n *NodeManager) DispatchUEPS(pkt *ueps.ParsedPacket) error {
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// 1. The "Threat" Circuit Breaker (L5 Guard)
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if pkt.Header.ThreatScore > 50000 {
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// High threat? Drop it. Don't even parse the payload.
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// This protects the Agent from "semantic viruses"
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return fmt.Errorf("packet rejected: threat score %d exceeds safety limit", pkt.Header.ThreatScore)
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"forge.lthn.ai/core/go-p2p/logging"
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"forge.lthn.ai/core/go-p2p/ueps"
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)
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// ThreatScoreThreshold is the maximum allowable threat score. Packets exceeding
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// this value are silently dropped by the circuit breaker and logged as threat
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// events. The threshold sits at ~76% of the uint16 range (50,000 / 65,535),
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// providing headroom for legitimate elevated-risk traffic whilst rejecting
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// clearly hostile payloads.
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const ThreatScoreThreshold uint16 = 50000
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// Well-known intent identifiers. These correspond to the semantic tokens
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// carried in the UEPS IntentID header field (RFC-021).
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const (
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IntentHandshake byte = 0x01 // Connection establishment / hello
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IntentCompute byte = 0x20 // Compute job request
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IntentRehab byte = 0x30 // Benevolent intervention (pause execution)
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IntentCustom byte = 0xFF // Extended / application-level sub-protocols
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)
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// IntentHandler processes a UEPS packet that has been routed by intent.
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// Implementations receive the fully parsed and HMAC-verified packet.
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type IntentHandler func(pkt *ueps.ParsedPacket) error
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// Dispatcher routes verified UEPS packets to registered intent handlers.
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// It enforces a threat circuit breaker before routing: any packet whose
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// ThreatScore exceeds ThreatScoreThreshold is dropped and logged.
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//
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// Design decisions:
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// - Handlers are registered per IntentID (1:1 mapping).
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// - Unknown intents are logged at WARN level and silently dropped (no error
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// returned to the caller) to avoid back-pressure on the transport layer.
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// - High-threat packets are dropped silently (logged at WARN) rather than
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// returning an error, consistent with the "don't even parse the payload"
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// philosophy from the original stub.
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// - The dispatcher is safe for concurrent use; a RWMutex protects the
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// handler map.
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type Dispatcher struct {
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handlers map[byte]IntentHandler
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mu sync.RWMutex
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log *logging.Logger
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}
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// NewDispatcher creates a Dispatcher with no registered handlers.
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func NewDispatcher() *Dispatcher {
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return &Dispatcher{
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handlers: make(map[byte]IntentHandler),
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log: logging.New(logging.Config{
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Level: logging.LevelDebug,
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Component: "dispatcher",
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}),
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}
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}
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// RegisterHandler associates an IntentHandler with a specific IntentID.
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// Calling RegisterHandler with an IntentID that already has a handler will
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// replace the previous handler.
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func (d *Dispatcher) RegisterHandler(intentID byte, handler IntentHandler) {
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d.mu.Lock()
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defer d.mu.Unlock()
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d.handlers[intentID] = handler
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d.log.Debug("handler registered", logging.Fields{
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"intent_id": fmt.Sprintf("0x%02X", intentID),
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})
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}
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// Dispatch routes a parsed UEPS packet through the threat circuit breaker
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// and then to the appropriate intent handler.
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//
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// Behaviour:
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// - Returns ErrThreatScoreExceeded if the packet's ThreatScore exceeds the
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// threshold (packet is dropped and logged).
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// - Returns ErrUnknownIntent if no handler is registered for the IntentID
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// (packet is dropped and logged).
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// - Returns nil on successful delivery to a handler, or any error the
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// handler itself returns.
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// - A nil packet returns ErrNilPacket immediately.
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func (d *Dispatcher) Dispatch(pkt *ueps.ParsedPacket) error {
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if pkt == nil {
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return ErrNilPacket
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}
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// 2. The "Intent" Router (L9 Semantic)
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switch pkt.Header.IntentID {
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case 0x01: // Handshake / Hello
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// return n.handleHandshake(pkt)
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// 1. Threat circuit breaker (L5 guard)
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if pkt.Header.ThreatScore > ThreatScoreThreshold {
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d.log.Warn("packet dropped: threat score exceeds safety threshold", logging.Fields{
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"threat_score": pkt.Header.ThreatScore,
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"threshold": ThreatScoreThreshold,
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"intent_id": fmt.Sprintf("0x%02X", pkt.Header.IntentID),
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"version": pkt.Header.Version,
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})
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return ErrThreatScoreExceeded
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}
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case 0x20: // Compute / Job Request
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// "Hey, can you run this Docker container?"
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// Check local resources first (Self-Validation)
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// return n.handleComputeRequest(pkt.Payload)
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// 2. Intent routing (L9 semantic)
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d.mu.RLock()
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handler, exists := d.handlers[pkt.Header.IntentID]
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d.mu.RUnlock()
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case 0x30: // Rehab / Intervention
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// "Violet says you are hallucinating. Pause execution."
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// This is the "Benevolent Intervention" Axiom.
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// return n.enterRehabMode(pkt.Payload)
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if !exists {
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d.log.Warn("packet dropped: unknown intent", logging.Fields{
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"intent_id": fmt.Sprintf("0x%02X", pkt.Header.IntentID),
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"version": pkt.Header.Version,
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})
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return ErrUnknownIntent
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}
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case 0xFF: // Extended / Custom
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// Check the payload for specific sub-protocols (e.g. your JSON blobs)
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// return n.handleApplicationData(pkt.Payload)
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default:
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return fmt.Errorf("unknown intent ID: 0x%X", pkt.Header.IntentID)
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}
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return nil
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return handler(pkt)
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}
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*/
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// Sentinel errors returned by Dispatch.
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var (
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// ErrThreatScoreExceeded is returned when a packet's ThreatScore exceeds
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// the safety threshold.
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ErrThreatScoreExceeded = fmt.Errorf("packet rejected: threat score exceeds safety threshold (%d)", ThreatScoreThreshold)
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// ErrUnknownIntent is returned when no handler is registered for the
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// packet's IntentID.
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ErrUnknownIntent = fmt.Errorf("packet dropped: unknown intent")
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// ErrNilPacket is returned when a nil packet is passed to Dispatch.
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ErrNilPacket = fmt.Errorf("dispatch: nil packet")
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)
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346
node/dispatcher_test.go
Normal file
346
node/dispatcher_test.go
Normal file
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@ -0,0 +1,346 @@
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package node
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"testing"
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"forge.lthn.ai/core/go-p2p/ueps"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// makePacket builds a minimal ParsedPacket for testing. ThreatScore defaults
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// to 0 (safe) and Version to 0x09 (current protocol).
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func makePacket(intentID byte, threatScore uint16, payload []byte) *ueps.ParsedPacket {
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return &ueps.ParsedPacket{
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Header: ueps.UEPSHeader{
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Version: 0x09,
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CurrentLayer: 5,
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TargetLayer: 5,
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IntentID: intentID,
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ThreatScore: threatScore,
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},
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Payload: payload,
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}
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}
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// --- Dispatcher Tests ---
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func TestDispatcher_RegisterAndDispatch(t *testing.T) {
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t.Run("handler receives the correct packet", func(t *testing.T) {
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d := NewDispatcher()
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var received *ueps.ParsedPacket
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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received = pkt
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return nil
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})
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pkt := makePacket(IntentHandshake, 0, []byte("hello"))
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err := d.Dispatch(pkt)
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require.NoError(t, err)
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require.NotNil(t, received)
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assert.Equal(t, pkt, received)
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assert.Equal(t, []byte("hello"), received.Payload)
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})
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t.Run("handler error propagates to caller", func(t *testing.T) {
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d := NewDispatcher()
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handlerErr := fmt.Errorf("compute failed")
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d.RegisterHandler(IntentCompute, func(pkt *ueps.ParsedPacket) error {
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return handlerErr
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})
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pkt := makePacket(IntentCompute, 0, []byte("job"))
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err := d.Dispatch(pkt)
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assert.ErrorIs(t, err, handlerErr)
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})
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}
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func TestDispatcher_ThreatCircuitBreaker(t *testing.T) {
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tests := []struct {
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name string
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threatScore uint16
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wantErr error
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dispatched bool
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}{
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{
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name: "score at threshold is allowed",
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threatScore: ThreatScoreThreshold,
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wantErr: nil,
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dispatched: true,
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},
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{
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name: "score just above threshold is rejected",
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threatScore: ThreatScoreThreshold + 1,
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wantErr: ErrThreatScoreExceeded,
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dispatched: false,
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},
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{
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name: "maximum uint16 score is rejected",
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threatScore: 65535,
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wantErr: ErrThreatScoreExceeded,
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dispatched: false,
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},
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{
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name: "zero score is allowed",
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threatScore: 0,
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wantErr: nil,
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dispatched: true,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := NewDispatcher()
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var called bool
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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called = true
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return nil
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})
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pkt := makePacket(IntentHandshake, tt.threatScore, []byte("data"))
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err := d.Dispatch(pkt)
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if tt.wantErr != nil {
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assert.ErrorIs(t, err, tt.wantErr)
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} else {
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assert.NoError(t, err)
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}
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assert.Equal(t, tt.dispatched, called)
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})
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}
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}
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func TestDispatcher_UnknownIntentDropped(t *testing.T) {
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d := NewDispatcher()
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// Register handlers for known intents only
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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return nil
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})
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// Dispatch a packet with an unregistered intent (0x42)
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pkt := makePacket(0x42, 0, []byte("unknown"))
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err := d.Dispatch(pkt)
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assert.ErrorIs(t, err, ErrUnknownIntent)
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}
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func TestDispatcher_MultipleHandlersCorrectRouting(t *testing.T) {
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d := NewDispatcher()
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var handshakeCalled, computeCalled, rehabCalled, customCalled bool
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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handshakeCalled = true
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return nil
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})
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d.RegisterHandler(IntentCompute, func(pkt *ueps.ParsedPacket) error {
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computeCalled = true
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return nil
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})
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d.RegisterHandler(IntentRehab, func(pkt *ueps.ParsedPacket) error {
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rehabCalled = true
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return nil
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})
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d.RegisterHandler(IntentCustom, func(pkt *ueps.ParsedPacket) error {
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customCalled = true
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return nil
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})
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tests := []struct {
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name string
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intentID byte
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want *bool
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}{
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{"handshake routes correctly", IntentHandshake, &handshakeCalled},
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{"compute routes correctly", IntentCompute, &computeCalled},
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{"rehab routes correctly", IntentRehab, &rehabCalled},
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{"custom routes correctly", IntentCustom, &customCalled},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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// Reset all flags
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handshakeCalled = false
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computeCalled = false
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rehabCalled = false
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customCalled = false
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pkt := makePacket(tt.intentID, 0, []byte("payload"))
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err := d.Dispatch(pkt)
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require.NoError(t, err)
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assert.True(t, *tt.want, "expected handler for intent 0x%02X to be called", tt.intentID)
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// Verify no other handler was called
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for _, other := range tests {
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if other.intentID != tt.intentID {
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assert.False(t, *other.want,
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"handler for intent 0x%02X should not have been called when dispatching 0x%02X",
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other.intentID, tt.intentID)
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}
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}
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})
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}
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}
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func TestDispatcher_NilAndEmptyPayload(t *testing.T) {
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t.Run("nil packet returns ErrNilPacket", func(t *testing.T) {
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d := NewDispatcher()
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err := d.Dispatch(nil)
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assert.ErrorIs(t, err, ErrNilPacket)
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})
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t.Run("nil payload is delivered to handler", func(t *testing.T) {
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d := NewDispatcher()
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var received *ueps.ParsedPacket
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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received = pkt
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return nil
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})
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pkt := makePacket(IntentHandshake, 0, nil)
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err := d.Dispatch(pkt)
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require.NoError(t, err)
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require.NotNil(t, received)
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assert.Nil(t, received.Payload)
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})
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t.Run("empty payload is delivered to handler", func(t *testing.T) {
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d := NewDispatcher()
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var received *ueps.ParsedPacket
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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received = pkt
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return nil
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})
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pkt := makePacket(IntentHandshake, 0, []byte{})
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err := d.Dispatch(pkt)
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require.NoError(t, err)
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require.NotNil(t, received)
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assert.Empty(t, received.Payload)
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})
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}
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func TestDispatcher_ConcurrentDispatchSafety(t *testing.T) {
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d := NewDispatcher()
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var count atomic.Int64
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d.RegisterHandler(IntentCompute, func(pkt *ueps.ParsedPacket) error {
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count.Add(1)
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return nil
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})
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const goroutines = 100
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var wg sync.WaitGroup
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wg.Add(goroutines)
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for i := 0; i < goroutines; i++ {
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go func() {
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defer wg.Done()
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pkt := makePacket(IntentCompute, 0, []byte("concurrent"))
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err := d.Dispatch(pkt)
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assert.NoError(t, err)
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}()
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}
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wg.Wait()
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assert.Equal(t, int64(goroutines), count.Load())
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}
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func TestDispatcher_ConcurrentRegisterAndDispatch(t *testing.T) {
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d := NewDispatcher()
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var count atomic.Int64
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// Pre-register a handler so dispatches have something to hit
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d.RegisterHandler(IntentHandshake, func(pkt *ueps.ParsedPacket) error {
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count.Add(1)
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return nil
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})
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const goroutines = 50
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var wg sync.WaitGroup
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wg.Add(goroutines * 2)
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// Half the goroutines dispatch packets
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for i := 0; i < goroutines; i++ {
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go func() {
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defer wg.Done()
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pkt := makePacket(IntentHandshake, 0, []byte("data"))
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_ = d.Dispatch(pkt)
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}()
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}
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// Half the goroutines register/replace handlers concurrently
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for i := 0; i < goroutines; i++ {
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go func(n int) {
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defer wg.Done()
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d.RegisterHandler(byte(n%4), func(pkt *ueps.ParsedPacket) error {
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return nil
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})
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}(i)
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}
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wg.Wait()
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// We only assert no panics / races occurred; count may vary depending
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// on scheduling order.
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assert.True(t, count.Load() >= 0)
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}
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func TestDispatcher_ReplaceHandler(t *testing.T) {
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d := NewDispatcher()
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var firstCalled, secondCalled bool
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d.RegisterHandler(IntentCompute, func(pkt *ueps.ParsedPacket) error {
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firstCalled = true
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return nil
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})
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// Replace the handler
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d.RegisterHandler(IntentCompute, func(pkt *ueps.ParsedPacket) error {
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secondCalled = true
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return nil
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})
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pkt := makePacket(IntentCompute, 0, []byte("replaced"))
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err := d.Dispatch(pkt)
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require.NoError(t, err)
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assert.False(t, firstCalled, "original handler should not be called after replacement")
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assert.True(t, secondCalled, "replacement handler should be called")
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}
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func TestDispatcher_ThreatBlocksBeforeRouting(t *testing.T) {
|
||||
// Verify that the circuit breaker fires before intent routing,
|
||||
// so even an unknown intent returns ErrThreatScoreExceeded (not ErrUnknownIntent).
|
||||
d := NewDispatcher()
|
||||
|
||||
pkt := makePacket(0x42, ThreatScoreThreshold+1, []byte("hostile"))
|
||||
err := d.Dispatch(pkt)
|
||||
|
||||
assert.ErrorIs(t, err, ErrThreatScoreExceeded,
|
||||
"threat circuit breaker should fire before intent routing")
|
||||
}
|
||||
|
||||
func TestDispatcher_IntentConstants(t *testing.T) {
|
||||
// Verify the well-known intent IDs match the spec (RFC-021).
|
||||
assert.Equal(t, byte(0x01), IntentHandshake)
|
||||
assert.Equal(t, byte(0x20), IntentCompute)
|
||||
assert.Equal(t, byte(0x30), IntentRehab)
|
||||
assert.Equal(t, byte(0xFF), IntentCustom)
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue