fix(node): the answer log names its host addresses

aiortc ends a host candidate line at `typ host`, so the match on
" typ host " found none and logged `host: none` for every answer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py b/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
index fea642a5..3a9c2fa5 100644
--- a/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
+++ b/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
@@ -85,6 +85,18 @@ MAX_PEER_SESSIONS_PER_ACCOUNT = MAX_PEER_SESSIONS // 2
 UNAUTHENTICATED_SESSION_TIMEOUT = 60   # seconds
 
 
+def _host_addresses(sdp: str) -> set[str]:
+    """The host addresses an SDP offers. A candidate line ends at `typ host`
+    when nothing follows it, as aiortc writes them: matched by field, not by
+    `" typ host "`, which found none and logged `host: none` for every answer."""
+    addresses: set[str] = set()
+    for line in sdp.splitlines():
+        parts = line.split()
+        if line.startswith("a=candidate:") and parts[6:8] == ["typ", "host"]:
+            addresses.add(parts[4])
+    return addresses
+
+
 class WebRTCPeerSession(
     DispatchMixin, AdminMixin, AdmissionMixin, BlobsMixin, ChatMixin, FilesMixin, GroupOpsMixin,
     HandshakeMixin, NodeOpsMixin, TransferMixin, UploadMixin,
@@ -404,12 +416,7 @@ class WebRTCTransport:
         # anything that peer could route to at all — on a NAT'd host or a VM the
         # only host candidate is an address no one else can reach, and the log
         # otherwise looks identical to a working connection.
-        host_addrs: set[str] = set()
-        for line in answer_sdp.splitlines():
-            if line.startswith("a=candidate:") and " typ host " in line:
-                parts = line.split()
-                if len(parts) > 5:
-                    host_addrs.add(parts[4])
+        host_addrs = _host_addresses(answer_sdp)
         log.info(
             "WebRTC answer ready for peer=%s (ICE gather %.2fs, host: %s, %d srflx)",
             peer_id, time.monotonic() - gather_start,