quic: minor reduction in code duplication

PR-URL: #34283
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: jasnell

doc/api/quic.md

@@ -255,6 +255,8 @@ added: REPLACEME
 * `options` {Object}
   * `client` {Object} A default configuration for QUIC client sessions created
     using `quicsocket.connect()`.
+  * `disableStatelessReset` {boolean} When `true` the `QuicSocket` will not
+    send stateless resets. **Default**: `false`.
   * `endpoint` {Object} An object describing the local address to bind to.
     * `address` {string} The local address to bind to. This may be an IPv4 or
       IPv6 address or a host name. If a host name is given, it will be resolved
@@ -276,6 +278,10 @@ added: REPLACEME
   * `retryTokenTimeout` {number} The maximum number of *seconds* for retry token
     validation. Default: `10` seconds.
   * `server` {Object} A default configuration for QUIC server sessions.
+  * `statelessResetSecret` {Buffer|Uint8Array} A 16-byte `Buffer` or
+    `Uint8Array` providing the secret to use when generating stateless reset
+    tokens. If not specified, a random secret will be generated for the
+    `QuicSocket`. **Default**: `undefined`.
   * `validateAddress` {boolean} When `true`, the `QuicSocket` will use explicit
     address validation using a QUIC `RETRY` frame when listening for new server
     sessions. Default: `false`.

lib/internal/quic/core.js

@@ -581,6 +581,14 @@ function getStats(obj, idx) {
   return stats[idx];
 }
 
+function addressOrLocalhost(address, type) {
+  return address || (type === AF_INET6 ? '::' : '0.0.0.0');
+}
+
+function lookupOrDefault(lookup, type) {
+  return lookup || (type === AF_INET6 ? lookup6 : lookup4);
+}
+
 // QuicEndpoint wraps a UDP socket and is owned
 // by a QuicSocket. It does not exist independently
 // of the QuicSocket.
@@ -610,9 +618,9 @@ class QuicEndpoint {
     } = validateQuicEndpointOptions(options);
     const state = this[kInternalState];
     state.socket = socket;
-    state.address = address || (type === AF_INET6 ? '::' : '0.0.0.0');
+    state.address = addressOrLocalhost(address, type);
+    state.lookup = lookupOrDefault(lookup, type);
     state.ipv6Only = ipv6Only;
-    state.lookup = lookup || (type === AF_INET6 ? lookup6 : lookup4);
     state.port = port;
     state.reuseAddr = reuseAddr;
     state.type = type;
@@ -901,8 +909,8 @@ class QuicSocket extends EventEmitter {
     const state = this[kInternalState];
 
     state.client = client;
-    state.lookup = lookup || (type === AF_INET6 ? lookup6 : lookup4);
     state.server = server;
+    state.lookup = lookupOrDefault(lookup, type);
 
     let socketOptions = 0;
     if (validateAddress)
@@ -1286,7 +1294,7 @@ class QuicSocket extends EventEmitter {
     // Notice here that connectAfterLookup is bound to the QuicSession
     // that was created...
     lookup(
-      address || (type === AF_INET6 ? '::' : '0.0.0.0'),
+      addressOrLocalhost(address, type),
       connectAfterLookup.bind(session, type));
   }