nearbyconnections : Implement WifiLanV2 BandwidthUpgrade functions.

PiperOrigin-RevId: 405821802

cpp/core/internal/BUILD

@@ -43,6 +43,7 @@ cc_library(
         "webrtc_bwu_handler.cc",
         "webrtc_endpoint_channel.cc",
         "wifi_lan_bwu_handler.cc",
+        "wifi_lan_bwu_handler_v2.cc",
         "wifi_lan_endpoint_channel.cc",
         "wifi_lan_endpoint_channel_v2.cc",
         "wifi_lan_service_info.cc",
@@ -81,6 +82,7 @@ cc_library(
         "webrtc_bwu_handler.h",
         "webrtc_endpoint_channel.h",
         "wifi_lan_bwu_handler.h",
+        "wifi_lan_bwu_handler_v2.h",
         "wifi_lan_endpoint_channel.h",
         "wifi_lan_endpoint_channel_v2.h",
         "wifi_lan_service_info.h",

cpp/core/internal/mediums/wifi_lan_v2.cc

@@ -351,8 +351,33 @@ WifiLanSocketV2 WifiLanV2::Connect(const std::string& service_id,
                                    const std::string& ip_address, int port,
                                    CancellationFlag* cancellation_flag) {
   MutexLock lock(&mutex_);
+  // Socket to return. To allow for NRVO to work, it has to be a single object.
+  WifiLanSocketV2 socket;
 
-  return {};
+  if (service_id.empty()) {
+    NEARBY_LOGS(INFO) << "Refusing to create client WifiLan socket because "
+                         "service_id is empty.";
+    return socket;
+  }
+
+  if (!IsAvailableLocked()) {
+    NEARBY_LOGS(INFO) << "Can't create client WifiLan socket [service_id="
+                      << service_id << "]; WifiLan isn't available.";
+    return socket;
+  }
+
+  if (cancellation_flag->Cancelled()) {
+    NEARBY_LOGS(INFO) << "Can't create client WifiLan socket due to cancel.";
+    return socket;
+  }
+
+  socket = medium_.ConnectToService(ip_address, port, cancellation_flag);
+  if (!socket.IsValid()) {
+    NEARBY_LOGS(INFO) << "Failed to Connect via WifiLan [service_id="
+                      << service_id << "]";
+  }
+
+  return socket;
 }
 
 std::pair<std::string, int> WifiLanV2::GetCredentials(

cpp/core/internal/wifi_lan_bwu_handler_v2.cc

@@ -0,0 +1,169 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "core/internal/wifi_lan_bwu_handler_v2.h"
+
+#include <locale>
+#include <string>
+
+#include "absl/functional/bind_front.h"
+#include "core/internal/client_proxy.h"
+#include "core/internal/mediums/utils.h"
+#include "core/internal/offline_frames.h"
+#include "core/internal/wifi_lan_endpoint_channel_v2.h"
+#include "platform/public/wifi_lan_v2.h"
+
+namespace location {
+namespace nearby {
+namespace connections {
+
+WifiLanV2BwuHandler::WifiLanV2BwuHandler(
+    Mediums& mediums, EndpointChannelManager& channel_manager,
+    BwuNotifications notifications)
+    : BaseBwuHandler(channel_manager, std::move(notifications)),
+      mediums_(mediums) {}
+
+// Called by BWU initiator. Set up WifiLan upgraded medium for this endpoint,
+// and returns a upgrade path info (ip address, port) for remote party to
+// perform discovery.
+ByteArray WifiLanV2BwuHandler::InitializeUpgradedMediumForEndpoint(
+    ClientProxy* client, const std::string& service_id,
+    const std::string& endpoint_id) {
+  // Use wrapped service ID to avoid have the same ID with the one for
+  // startAdvertising. Otherwise, the listening request would be ignored because
+  // the medium already start accepting the connection because the client not
+  // stop the advertising yet.
+  std::string upgrade_service_id = Utils::WrapUpgradeServiceId(service_id);
+
+  auto credential = wifi_lan_medium_.GetCredentials(upgrade_service_id);
+  auto ip_address = credential.first;
+  auto port = credential.second;
+  if (ip_address.empty()) {
+    NEARBY_LOGS(INFO)
+        << "WifiLanBwuHandler couldn't initiate the wifi_lan upgrade for "
+           "endpoint "
+        << endpoint_id
+        << " because the wifi_lan ip address were unable to be obtained.";
+    return {};
+  }
+
+  if (!wifi_lan_medium_.IsAcceptingConnections(upgrade_service_id)) {
+    if (!wifi_lan_medium_.StartAcceptingConnections(
+            upgrade_service_id,
+            {
+                .accepted_cb = absl::bind_front(
+                    &WifiLanV2BwuHandler::OnIncomingWifiLanConnection, this,
+                    client, service_id),
+            })) {
+      NEARBY_LOGS(ERROR)
+          << "WifiLanBwuHandler couldn't initiate the WifiLan upgrade for "
+             "endpoint "
+          << endpoint_id
+          << " because it failed to start listening for "
+             "incoming WifiLan connections.";
+      return {};
+    }
+    NEARBY_LOGS(INFO)
+        << "WifiLanBwuHandler successfully started listening for incoming "
+           "WifiLan connections while upgrading endpoint "
+        << endpoint_id;
+  }
+
+  // cache service ID to revert
+  active_service_ids_.insert(upgrade_service_id);
+
+  return parser::ForBwuWifiLanPathAvailable(ip_address, port);
+}
+
+void WifiLanV2BwuHandler::Revert() {
+  for (const std::string& service_id : active_service_ids_) {
+    wifi_lan_medium_.StopAcceptingConnections(service_id);
+  }
+  active_service_ids_.clear();
+
+  NEARBY_LOG(INFO, "WifiLanBwuHandler successfully reverted all states.");
+}
+
+// Called by BWU target. Retrieves a new medium info from incoming message,
+// and establishes connection over WifiLan using this info.
+std::unique_ptr<EndpointChannel>
+WifiLanV2BwuHandler::CreateUpgradedEndpointChannel(
+    ClientProxy* client, const std::string& service_id,
+    const std::string& endpoint_id, const UpgradePathInfo& upgrade_path_info) {
+  if (!upgrade_path_info.has_wifi_lan_socket()) {
+    return nullptr;
+  }
+  const UpgradePathInfo::WifiLanSocket& upgrade_path_info_socket =
+      upgrade_path_info.wifi_lan_socket();
+  if (!upgrade_path_info_socket.has_ip_address() ||
+      !upgrade_path_info_socket.has_wifi_port()) {
+    NEARBY_LOG(ERROR, "WifiLanBwuHandler failed to parse UpgradePathInfo.");
+    return nullptr;
+  }
+
+  const std::string& ip_address = upgrade_path_info_socket.ip_address();
+  std::int32_t port = upgrade_path_info_socket.wifi_port();
+
+  NEARBY_LOGS(VERBOSE) << "WifiLanBwuHandler is attempting to connect to "
+                          "available WifiLan service ("
+                       << ip_address << ":" << port << ") for endpoint "
+                       << endpoint_id;
+
+  WifiLanSocketV2 socket = wifi_lan_medium_.Connect(
+      service_id, ip_address, port, client->GetCancellationFlag(endpoint_id));
+  if (!socket.IsValid()) {
+    NEARBY_LOGS(ERROR)
+        << "WifiLanBwuHandler failed to connect to the WifiLan service ("
+        << ip_address << ":" << port << ") for endpoint " << endpoint_id;
+    return nullptr;
+  }
+
+  NEARBY_LOGS(VERBOSE)
+      << "WifiLanBwuHandler successfully connected to WifiLan service ("
+      << ip_address << ":" << port << ") while upgrading endpoint "
+      << endpoint_id;
+
+  // Create a new WifiLanEndpointChannel.
+  auto channel =
+      absl::make_unique<WifiLanEndpointChannelV2>(service_id, socket);
+  if (channel == nullptr) {
+    NEARBY_LOGS(ERROR) << "WifiLanBwuHandler failed to create WifiLan endpoint "
+                          "channel to the WifiLan service ("
+                       << ip_address << ":" << port << ") for endpoint "
+                       << endpoint_id;
+    socket.Close();
+    return nullptr;
+  }
+
+  return channel;
+}
+
+// Accept Connection Callback.
+void WifiLanV2BwuHandler::OnIncomingWifiLanConnection(
+    ClientProxy* client, const std::string& service_id,
+    WifiLanSocketV2 socket) {
+  auto channel =
+      absl::make_unique<WifiLanEndpointChannelV2>(service_id, socket);
+  std::unique_ptr<IncomingSocketConnection> connection(
+      new IncomingSocketConnection{
+          .socket =
+              absl::make_unique<WifiLanV2IncomingSocket>(service_id, socket),
+          .channel = std::move(channel),
+      });
+  bwu_notifications_.incoming_connection_cb(client, std::move(connection));
+}
+
+}  // namespace connections
+}  // namespace nearby
+}  // namespace location

cpp/core/internal/wifi_lan_bwu_handler_v2.h

@@ -0,0 +1,80 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CORE_INTERNAL_WIFI_LAN_BWU_HANDLER_H_
+#define CORE_INTERNAL_WIFI_LAN_BWU_HANDLER_H_
+
+#include "core/internal/base_bwu_handler.h"
+#include "core/internal/client_proxy.h"
+#include "core/internal/endpoint_channel_manager.h"
+#include "core/internal/mediums/mediums.h"
+
+namespace location {
+namespace nearby {
+namespace connections {
+
+// Defines the set of methods that need to be implemented to handle the
+// per-Medium-specific operations needed to upgrade an EndpointChannel.
+class WifiLanV2BwuHandler : public BaseBwuHandler {
+ public:
+  WifiLanV2BwuHandler(Mediums& mediums, EndpointChannelManager& channel_manager,
+                      BwuNotifications notifications);
+  ~WifiLanV2BwuHandler() override = default;
+
+ private:
+  ByteArray InitializeUpgradedMediumForEndpoint(
+      ClientProxy* client, const std::string& service_id,
+      const std::string& endpoint_id) override;
+
+  void Revert() override;
+
+  std::unique_ptr<EndpointChannel> CreateUpgradedEndpointChannel(
+      ClientProxy* client, const std::string& service_id,
+      const std::string& endpoint_id,
+      const UpgradePathInfo& upgrade_path_info) override;
+
+  Medium GetUpgradeMedium() const override { return Medium::MDNS; }
+
+  void OnEndpointDisconnect(ClientProxy* client,
+                            const std::string& endpoint_id) override {}
+
+  void OnIncomingWifiLanConnection(ClientProxy* client,
+                                   const std::string& service_id,
+                                   WifiLanSocketV2 socket);
+
+  class WifiLanV2IncomingSocket : public BwuHandler::IncomingSocket {
+   public:
+    explicit WifiLanV2IncomingSocket(const std::string& name,
+                                     WifiLanSocketV2 socket)
+        : name_(name), socket_(socket) {}
+    ~WifiLanV2IncomingSocket() override = default;
+
+    std::string ToString() override { return name_; }
+    void Close() override { socket_.Close(); }
+
+   private:
+    std::string name_;
+    WifiLanSocketV2 socket_;
+  };
+
+  Mediums& mediums_;
+  WifiLanV2& wifi_lan_medium_{mediums_.GetWifiLanV2()};
+  absl::flat_hash_set<std::string> active_service_ids_;
+};
+
+}  // namespace connections
+}  // namespace nearby
+}  // namespace location
+
+#endif  // CORE_INTERNAL_WIFI_LAN_BWU_HANDLER_H_