Shared rate limiter for multiple conns

service/domain/relay_address.go

@@ -9,7 +9,8 @@ import (
 )
 
 type RelayAddress struct {
-	original string
+	original        string
+	hostWithoutPort string
 }
 
 func NewRelayAddress(s string) (RelayAddress, error) {
@@ -25,8 +26,16 @@ func NewRelayAddress(s string) (RelayAddress, error) {
 		return RelayAddress{}, errors.New("invalid protocol")
 	}
 
+	u.Host = strings.ToLower(u.Host)
+	hostWithoutPort, _, err := net.SplitHostPort(u.Host)
+	if err != nil {
+		hostWithoutPort = u.Host
+	}
+	normalizedURI := u.String()
+
 	return RelayAddress{
-		original: s,
+		original:        normalizedURI,
+		hostWithoutPort: hostWithoutPort,
 	}, nil
 }
 
@@ -43,22 +52,12 @@ func NewRelayAddressFromMaybeAddress(maybe MaybeRelayAddress) (RelayAddress, err
 }
 
 func (r RelayAddress) IsLoopbackOrPrivate() bool {
-	hostWithoutPort := r.getHostWithoutPort()
-	ip := net.ParseIP(hostWithoutPort)
+	ip := net.ParseIP(r.hostWithoutPort)
 	return ip.IsLoopback() || ip.IsPrivate()
 }
 
-func (r RelayAddress) getHostWithoutPort() string {
-	u, err := url.Parse(r.original)
-	if err != nil {
-		panic(err) // checked in constructor
-	}
-
-	hostWithoutPort, _, err := net.SplitHostPort(u.Host)
-	if err != nil {
-		return u.Host
-	}
-	return hostWithoutPort
+func (r RelayAddress) HostWithoutPort() string {
+	return r.hostWithoutPort
 }
 
 func (r RelayAddress) String() string {

service/domain/relay_address_test.go

@@ -43,9 +43,13 @@ func TestRelayAddress(t *testing.T) {
 			Input:  "wss://example.com/ ",
 			Output: "wss://example.com",
 		},
+		{
+			Input:  "wss://EXAMPLE.com/FooBar ",
+			Output: "wss://example.com/FooBar",
+		},
 		{
 			Input:  "wss://example1.com/ wss://example2.com",
-			Output: "wss://example1.com/ wss://example2.com",
+			Output: "wss://example1.com/%20wss://example2.com",
 		},
 		{
 			Input:         "wss:// wss://example.com",

service/domain/relays/rate_limit_notice_backoff_manager.go

@@ -0,0 +1,69 @@
+package relays
+
+import (
+	"math"
+	"sync/atomic"
+	"time"
+)
+
+type RateLimitNoticeBackoffManager struct {
+	rateLimitNoticeCount int32
+	lastBumpTime         atomic.Value
+}
+
+func NewRateLimitNoticeBackoffManager() *RateLimitNoticeBackoffManager {
+	r := &RateLimitNoticeBackoffManager{
+		rateLimitNoticeCount: 0,
+	}
+
+	r.updateLastBumpTime()
+	return r
+}
+
+func (r *RateLimitNoticeBackoffManager) Bump() {
+	timeSinceLastBump := time.Since(r.getLastBumpTime())
+	if timeSinceLastBump < 500*time.Millisecond {
+		// Give some time for the rate limit to be lifted before increasing the counter
+		return
+	}
+
+	atomic.AddInt32(&r.rateLimitNoticeCount, 1)
+	r.updateLastBumpTime()
+}
+
+const maxBackoffMs = 10000
+const secondsToDecreaseRateLimitNoticeCount = 60 * 5 // 5 minutes = 300 seconds
+
+func (r *RateLimitNoticeBackoffManager) Wait() {
+	rateLimitNoticeCount := atomic.LoadInt32(&r.rateLimitNoticeCount)
+	if rateLimitNoticeCount <= 0 {
+		return
+	}
+
+	backoffMs := int(math.Min(float64(maxBackoffMs), math.Pow(2, float64(r.rateLimitNoticeCount))*50))
+
+	timeSinceLastBump := time.Since(r.getLastBumpTime())
+	if timeSinceLastBump > secondsToDecreaseRateLimitNoticeCount*time.Second {
+		atomic.AddInt32(&r.rateLimitNoticeCount, -1)
+		r.updateLastBumpTime()
+	}
+
+	if backoffMs > 0 {
+		time.Sleep(time.Duration(backoffMs) * time.Millisecond)
+	}
+}
+
+func (r *RateLimitNoticeBackoffManager) updateLastBumpTime() time.Time {
+	t := time.Now()
+	r.lastBumpTime.Store(t)
+	return t
+}
+
+func (r *RateLimitNoticeBackoffManager) getLastBumpTime() time.Time {
+	val := r.lastBumpTime.Load()
+	if t, ok := val.(time.Time); ok {
+		return t
+	}
+
+	return r.updateLastBumpTime()
+}

service/domain/relays/relay_connection.go

@@ -8,7 +8,6 @@ import (
 	"regexp"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/boreq/errors"
@@ -54,59 +53,6 @@ type ConnectionFactory interface {
 	Address() domain.RelayAddress
 }
 
-type RateLimitNoticeBackoffManager struct {
-	address              domain.RelayAddress
-	rateLimitNoticeCount int32
-	lastBumpTime         atomic.Value // Use atomic.Value for time.Time
-}
-
-func (r *RateLimitNoticeBackoffManager) updateLastBumpTime() {
-	r.lastBumpTime.Store(time.Now())
-}
-
-func (r *RateLimitNoticeBackoffManager) getLastBumpTime() time.Time {
-	return r.lastBumpTime.Load().(time.Time)
-}
-
-func NewRateLimitNoticeBackoffManager(address domain.RelayAddress) *RateLimitNoticeBackoffManager {
-	r := &RateLimitNoticeBackoffManager{
-		address:              address,
-		rateLimitNoticeCount: 0,
-	}
-
-	r.updateLastBumpTime()
-	return r
-}
-
-func (r *RateLimitNoticeBackoffManager) Bump() {
-	timeSinceLastBump := time.Since(r.getLastBumpTime())
-	if timeSinceLastBump < 500*time.Millisecond {
-		// Give some time for the rate limit to be lifted before increasing the counter
-		return
-	}
-
-	atomic.AddInt32(&r.rateLimitNoticeCount, 1)
-	r.updateLastBumpTime()
-}
-
-func (r *RateLimitNoticeBackoffManager) Wait() {
-	if r.rateLimitNoticeCount <= 0 {
-		return
-	}
-
-	backoffMs := int(math.Pow(2, float64(r.rateLimitNoticeCount))) * 100
-
-	timeSinceLastBump := time.Since(r.getLastBumpTime())
-	if timeSinceLastBump > 5*time.Second {
-		atomic.AddInt32(&r.rateLimitNoticeCount, -1)
-		r.updateLastBumpTime()
-	}
-
-	if backoffMs > 0 {
-		time.Sleep(time.Duration(backoffMs) * time.Millisecond)
-	}
-}
-
 type RelayConnection struct {
 	connectionFactory ConnectionFactory
 	logger            logging.Logger
@@ -128,6 +74,7 @@ type RelayConnection struct {
 
 func NewRelayConnection(
 	connectionFactory ConnectionFactory,
+	rateLimitNoticeBackoffManager *RateLimitNoticeBackoffManager,
 	logger logging.Logger,
 	metrics Metrics,
 ) *RelayConnection {
@@ -141,7 +88,7 @@ func NewRelayConnection(
 		subscriptionsUpdatedCh:        make(chan struct{}),
 		eventsToSend:                  make(map[domain.EventId]*eventToSend),
 		newEventsCh:                   make(chan domain.Event),
-		rateLimitNoticeBackoffManager: NewRateLimitNoticeBackoffManager(connectionFactory.Address()),
+		rateLimitNoticeBackoffManager: rateLimitNoticeBackoffManager,
 	}
 }
 

service/domain/relays/relay_connection_test.go

@@ -135,9 +135,10 @@ type testConnection struct {
 func newTestConnection(tb testing.TB, ctx context.Context) *testConnection {
 	connection := newMockConnection()
 	factory := newMockConnectionFactory(connection)
+	backoffManager := relays.NewRateLimitNoticeBackoffManager()
 	metrics := newMockMetrics()
 	logger := logging.NewDevNullLogger()
-	relayConnection := relays.NewRelayConnection(factory, logger, metrics)
+	relayConnection := relays.NewRelayConnection(factory, backoffManager, logger, metrics)
 	go relayConnection.Run(ctx)
 
 	return &testConnection{

service/domain/relays/relay_connections.go

@@ -45,17 +45,19 @@ type RelayConnections struct {
 
 	longCtx context.Context
 
-	connections     map[domain.RelayAddress]*RelayConnection
-	connectionsLock sync.Mutex
+	connections                    map[domain.RelayAddress]*RelayConnection
+	rateLimitNoticeBackoffManagers map[string]*RateLimitNoticeBackoffManager
+	connectionsLock                sync.Mutex
 }
 
 func NewRelayConnections(ctx context.Context, logger logging.Logger, metrics Metrics) *RelayConnections {
 	v := &RelayConnections{
-		logger:          logger.New("relayConnections"),
-		metrics:         metrics,
-		longCtx:         ctx,
-		connections:     make(map[domain.RelayAddress]*RelayConnection),
-		connectionsLock: sync.Mutex{},
+		logger:                         logger.New("relayConnections"),
+		metrics:                        metrics,
+		longCtx:                        ctx,
+		connections:                    make(map[domain.RelayAddress]*RelayConnection),
+		rateLimitNoticeBackoffManagers: make(map[string]*RateLimitNoticeBackoffManager),
+		connectionsLock:                sync.Mutex{},
 	}
 	go v.storeMetricsLoop(ctx)
 	return v
@@ -104,7 +106,17 @@ func (r *RelayConnections) getConnection(relayAddress domain.RelayAddress) *Rela
 	}
 
 	factory := NewWebsocketConnectionFactory(relayAddress, r.logger)
-	connection := NewRelayConnection(factory, r.logger, r.metrics)
+
+	// Sometimes different addreses can point to the same relay. Example is
+	// wss://feeds.nostr.band/video and wss://feeds.nostr.band/audio.  For these
+	// cases, we want to share the rate limit notice backoff manager.
+	rateLimitNoticeBackoffManager, exists := r.rateLimitNoticeBackoffManagers[relayAddress.HostWithoutPort()]
+	if !exists {
+		rateLimitNoticeBackoffManager = NewRateLimitNoticeBackoffManager()
+		r.rateLimitNoticeBackoffManagers[relayAddress.HostWithoutPort()] = rateLimitNoticeBackoffManager
+	}
+
+	connection := NewRelayConnection(factory, rateLimitNoticeBackoffManager, r.logger, r.metrics)
 	go connection.Run(r.longCtx)
 
 	r.connections[relayAddress] = connection