Support direct channels peer_string

src/core/ext/transport/chttp2/transport/chttp2_transport.cc

@@ -397,23 +397,29 @@ static bool read_channel_args(grpc_chttp2_transport* t,
     }
   }
   if (channelz_enabled) {
-    // pick out just the host port (maybe trims off scheme prefix).
+    char* host = nullptr;
+    int port_num = -1;
+    // try to pick out just the host port (maybe trims off scheme prefix).
     grpc_uri* uri = grpc_uri_parse(t->peer_string, false);
-    GPR_ASSERT(uri != nullptr);
+    // if peer string was a valid URI, we can use our lib to do the trimming.
+    if (uri != nullptr) {
       const char* host_port = uri->path;
       if (*host_port == '/') ++host_port;
-    char* host;
       char* port;
       GPR_ASSERT(gpr_split_host_port(host_port, &host, &port));
-    int port_num = -1;
       if (port != nullptr) {
         port_num = atoi(port);
       }
+      gpr_free(port);
+    } else {
+      // if peer string is not a valid URI, just use the entire string to
+      // surface that info.
+      host = gpr_strdup(t->peer_string);
+    }
     t->channelz_socket =
         grpc_core::MakeRefCounted<grpc_core::channelz::SocketNode>(
             grpc_core::UniquePtr<char>(host), port_num);
     grpc_uri_destroy(uri);
-    gpr_free(port);
   }
   return enable_bdp;
 }