feat: limit max events per second

client_manager.py

@@ -1,4 +1,5 @@
 import json
+import time
 from typing import Any, Awaitable, Callable, List, Optional
 
 from fastapi import WebSocket
@@ -89,6 +90,9 @@ class NostrClientConnection:
         self.broadcast_event: Optional[Callable[[NostrClientConnection, NostrEvent], Awaitable[None]]] = None
         self.get_client_config: Optional[Callable[[], ClientConfig]] = None
 
+        self._last_event_timestamp = 0 # in seconds
+        self._event_count_per_timestamp = 0
+
     async def start(self):
         await self.websocket.accept()
         while True:
@@ -146,6 +150,11 @@ class NostrClientConnection:
     async def _handle_event(self, e: NostrEvent):
         resp_nip20: List[Any] = ["OK", e.id]
 
+        if self._exceeded_max_events_per_second():
+            resp_nip20 += [False, f"Exceeded max events per second limit'!"]
+            await self._send_msg(resp_nip20)
+            return None
+
         if not self.client_config.is_author_allowed(e.pubkey):
             resp_nip20 += [False, f"Public key '{e.pubkey}' is not allowed in relay '{self.relay_id}'!"]
             await self._send_msg(resp_nip20)
@@ -197,7 +206,7 @@ class NostrClientConnection:
 
     async def _handle_request(self, subscription_id: str, filter: NostrFilter) -> List:
         filter.subscription_id = subscription_id
-        self.remove_filter(subscription_id)
+        self._remove_filter(subscription_id)
         if self._can_add_filter():
             return [["NOTICE", f"Maximum number of filters ({self.client_config.max_client_filters}) exceeded."]]
 
@@ -211,11 +220,24 @@ class NostrClientConnection:
         serialized_events.append(resp_nip15)
         return serialized_events
 
-    def remove_filter(self, subscription_id: str):
+    def _remove_filter(self, subscription_id: str):
         self.filters = [f for f in self.filters if f.subscription_id != subscription_id]
 
     def _handle_close(self, subscription_id: str):
-        self.remove_filter(subscription_id)
+        self._remove_filter(subscription_id)
 
     def _can_add_filter(self) -> bool:
         return self.client_config.max_client_filters != 0 and len(self.filters) >= self.client_config.max_client_filters
+
+    def _exceeded_max_events_per_second(self) -> bool:
+        if self.client_config.max_events_per_second == 0:
+            return False
+
+        current_time = round(time.time())
+        if self._last_event_timestamp == current_time:
+            self._event_count_per_timestamp += 1
+        else:
+            self._last_event_timestamp = current_time
+            self._event_count_per_timestamp = 0
+
+        return self._event_count_per_timestamp > self.client_config.max_events_per_second

models.py

@@ -11,6 +11,7 @@ from secp256k1 import PublicKey
 class ClientConfig(BaseModel):
     max_client_filters = Field(0, alias="maxClientFilters")
     limit_per_filter = Field(1000, alias="limitPerFilter")
+    max_events_per_second = Field(0, alias="maxEventsPerSecond")
     allowed_public_keys = Field([], alias="allowedPublicKeys")
     blocked_public_keys = Field([], alias="blockedPublicKeys")
     

static/components/relay-details/relay-details.html

@@ -168,18 +168,18 @@
             ></q-input>
           </div>
           <div class="col-6">
+            <q-icon name="info" class="cursor-pointer">
+              <q-tooltip>
+                Maximum number of events to be returned in the initial query
+                (default 1000)
+              </q-tooltip></q-icon
+            >
             <q-badge
               v-if="relay.config.limitPerFilter == 0"
               color="green"
               class="float-left"
               ><span>No Limit</span>
             </q-badge>
-            <q-badge v-else color="yellow" text-color="black" class="float-left"
-              ><span
-                >Maximum number of events to be returned in the initial query
-                (default 1000)</span
-              >
-            </q-badge>
           </div>
         </div>
         <div class="row items-center no-wrap q-mb-md">
@@ -194,14 +194,41 @@
             ></q-input>
           </div>
           <div class="col-6">
-            <q-badge
-              v-if="relay.config.maxClientFilters == 0"
-              color="green"
-              class="float-left"
+            <q-icon name="info" class="cursor-pointer">
+              <q-tooltip>
+                Limit the number of filters that a client can have. Prevents
+                relay from being abused by clients with extremly high number of
+                fiters.
+              </q-tooltip></q-icon
+            >
+            <q-badge v-if="relay.config.maxClientFilters == 0" color="green"
               ><span>Unlimited Filters</span>
             </q-badge>
           </div>
         </div>
+        <div class="row items-center no-wrap q-mb-md">
+          <div class="col-3 q-pr-lg">Max events per second:</div>
+          <div class="col-3 q-pr-lg">
+            <q-input
+              filled
+              dense
+              v-model.trim="relay.config.maxEventsPerSecond"
+              type="number"
+              min="0"
+            ></q-input>
+          </div>
+          <div class="col-6">
+            <q-icon name="info" class="cursor-pointer">
+              <q-tooltip>
+                Limits the rate at which events are accepted by the relay.
+                Prevent clients from clogging the relay.
+              </q-tooltip></q-icon
+            >
+            <q-badge v-if="relay.config.maxEventsPerSecond == 0" color="green"
+              ><span>No Limit</span>
+            </q-badge>
+          </div>
+        </div>
       </div>
     </q-tab-panel>
     <q-tab-panel name="allowed">