blocking socket implementation

PiperOrigin-RevId: 715617508

internal/platform/implementation/windows/BUILD

@@ -93,6 +93,8 @@ cc_library(
         "file_path.h",
         "http_loader.h",
         "mutex.h",
+        "nearby_client_socket.h",
+        "nearby_server_socket.h",
         "scheduled_executor.h",
         "server_sync.h",
         "session_manager.h",
@@ -185,6 +187,8 @@ cc_library(
         "file.cc",
         "file_path.cc",
         "http_loader.cc",
+        "nearby_client_socket.cc",
+        "nearby_server_socket.cc",
         "platform.cc",
         "preferences_manager.cc",
         "preferences_repository.cc",

internal/platform/implementation/windows/nearby_client_socket.cc

@@ -0,0 +1,206 @@
+// Copyright 2025 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 "internal/platform/implementation/windows/nearby_client_socket.h"
+
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <utility>
+
+#include "internal/flags/nearby_flags.h"
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/flags/nearby_platform_feature_flags.h"
+#include "internal/platform/logging.h"
+
+namespace nearby::windows {
+
+NearbyClientSocket::NearbyClientSocket() {
+  WSADATA wsa_data;
+  int result = WSAStartup(MAKEWORD(2, 2), &wsa_data);
+  if (result != 0) {
+    LOG(WARNING) << "WSAStartup failed with error " << result;
+  }
+
+  is_socket_initiated_ = (result == 0);
+}
+
+NearbyClientSocket::NearbyClientSocket(SOCKET socket) : socket_(socket) {}
+
+NearbyClientSocket::~NearbyClientSocket() {
+  if (is_socket_initiated_) {
+    WSACleanup();
+  }
+}
+
+bool NearbyClientSocket ::Connect(const std::string& ip_address, int port) {
+  if (!is_socket_initiated_) {
+    LOG(WARNING) << "Windows socket is not initiated.";
+    return false;
+  }
+
+  if (socket_ != INVALID_SOCKET) {
+    LOG(ERROR) << "Socket is already connected.";
+    return false;
+  }
+
+  socket_ =
+      socket(/*af=*/AF_INET, /*type=*/SOCK_STREAM, /*protocol=*/IPPROTO_TCP);
+
+  if (socket_ == INVALID_SOCKET) {
+    LOG(ERROR) << "Failed to get socket with error " << WSAGetLastError();
+    return false;
+  }
+
+  struct sockaddr_in serv_addr;
+  serv_addr.sin_family = AF_INET;
+  serv_addr.sin_port = htons(port);
+  serv_addr.sin_addr.s_addr = inet_addr(ip_address.c_str());
+
+  BOOL flag = TRUE;
+  if (setsockopt(/*s=*/socket_, /*level=*/SOL_SOCKET, /*optname=*/SO_KEEPALIVE,
+                 /*optval=*/(const char*)&flag,
+                 /*optlen=*/sizeof(flag)) == SOCKET_ERROR) {
+    LOG(WARNING) << "Failed to set SO_KEEPALIVE with error "
+                 << WSAGetLastError();
+  }
+
+  int send_buffer_size =
+      static_cast<int>(NearbyFlags::GetInstance().GetInt64Flag(
+          nearby::platform::config_package_nearby::nearby_platform_feature::
+              kSocketSendBufferSize));
+  if (setsockopt(/*s=*/socket_, /*level=*/SOL_SOCKET, /*optname=*/SO_SNDBUF,
+                 /*optval=*/(char*)&send_buffer_size,
+                 /*optlen=*/sizeof(send_buffer_size)) == SOCKET_ERROR) {
+    LOG(WARNING) << "Failed to set SO_SNDBUF with error " << WSAGetLastError();
+  }
+
+  flag = TRUE;
+  setsockopt(/*s=*/socket_, /*level=*/IPPROTO_TCP, /*optname=*/TCP_NODELAY,
+             /*optval=*/(char*)&flag, /*optlen=*/sizeof(flag));
+
+  if (connect(/*s=*/socket_, /*name=*/(struct sockaddr*)&serv_addr,
+              /*namelen=*/sizeof(serv_addr)) == SOCKET_ERROR) {
+    LOG(ERROR) << "Failed to connect socket with error: " << WSAGetLastError();
+    closesocket(socket_);
+    socket_ = INVALID_SOCKET;
+    return false;
+  }
+
+  sockaddr_in local_address;
+  int address_length = sizeof(local_address);
+  if (getsockname(/*s=*/socket_, /*name=*/(SOCKADDR*)&local_address,
+                  /*namelen=*/&address_length) != SOCKET_ERROR) {
+    // Extract the IP address and port
+    char local_ip[INET_ADDRSTRLEN];
+    inet_ntop(AF_INET, &(local_address.sin_addr), local_ip, INET_ADDRSTRLEN);
+    int local_port = ntohs(local_address.sin_port);
+
+    LOG(INFO) << "Connected to " << ip_address << ":" << port << " from "
+              << local_ip << ":" << local_port;
+  }
+
+  return true;
+}
+
+ExceptionOr<ByteArray> NearbyClientSocket::Read(std::int64_t size) {
+  if (socket_ == INVALID_SOCKET) {
+    LOG(WARNING) << "Trying to read on an invalid socket.";
+    return {Exception::kIo};
+  }
+
+  std::string buffer;
+  int count = 0;
+
+  buffer.resize(size);
+  while (count < size) {
+    int result =
+        recv(/*s=*/socket_, /*buf=*/const_cast<char*>(buffer.data()) + count,
+             /*len=*/size - count, /*flags=*/MSG_WAITALL);
+    if (result == SOCKET_ERROR) {
+      LOG(ERROR) << "Failed to receive data " << WSAGetLastError();
+      return {Exception::kIo};
+    }
+
+    if (result == 0) {
+      LOG(INFO) << "Socket closed gracefully.";
+      return {Exception::kIo};
+    }
+
+    count += result;
+  }
+
+  return ExceptionOr(ByteArray(std::move(buffer)));
+}
+
+ExceptionOr<size_t> NearbyClientSocket::Skip(size_t offset) {
+  if (socket_ == INVALID_SOCKET) {
+    LOG(WARNING) << "Trying to skip to an invalid socket.";
+    return {Exception::kIo};
+  }
+
+  ExceptionOr<ByteArray> data = Read(offset);
+  if (data.ok()) {
+    return ExceptionOr(data.result().size());
+  }
+
+  LOG(ERROR) << "Failed to skip data " << WSAGetLastError();
+  return {Exception::kIo};
+}
+
+Exception NearbyClientSocket::Write(const ByteArray& data) {
+  if (socket_ == INVALID_SOCKET) {
+    LOG(WARNING) << "Trying to write to an invalid socket.";
+    return {Exception::kIo};
+  }
+
+  int count = 0;
+  while (count < data.size()) {
+    int result = send(/*s=*/socket_, /*buf=*/data.data() + count,
+                      /*len=*/data.size() - count, /*flags*/ 0);
+    if (result == SOCKET_ERROR) {
+      LOG(ERROR) << "Failed to send data " << WSAGetLastError();
+      return {Exception::kIo};
+    }
+    count += result;
+  }
+
+  return {Exception::kSuccess};
+}
+
+Exception NearbyClientSocket::Flush() {
+  // Socket doesn't support flush.
+  return {Exception::kSuccess};
+}
+
+Exception NearbyClientSocket::Close() {
+  if (socket_ == INVALID_SOCKET) {
+    LOG(WARNING) << "Trying to close an invalid socket.";
+    return {Exception::kIo};
+  }
+
+  shutdown(socket_, SD_BOTH);
+  closesocket(socket_);
+  socket_ = INVALID_SOCKET;
+
+  LOG(INFO) << "Socket closed.";
+
+  return {Exception::kSuccess};
+}
+
+}  // namespace nearby::windows

internal/platform/implementation/windows/nearby_client_socket.h

@@ -0,0 +1,49 @@
+// Copyright 2025 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 THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_WINDOWS_NEARBY_CLIENT_SOCKET_H_
+#define THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_WINDOWS_NEARBY_CLIENT_SOCKET_H_
+
+#include <winsock2.h>
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+
+namespace nearby::windows {
+
+class NearbyClientSocket {
+ public:
+  NearbyClientSocket();
+  explicit NearbyClientSocket(SOCKET socket);
+  ~NearbyClientSocket();
+
+  bool Connect(const std::string& ip_address, int port);
+  ExceptionOr<ByteArray> Read(std::int64_t size);
+  ExceptionOr<size_t> Skip(size_t offset);
+  Exception Write(const ByteArray& data);
+  Exception Flush();
+  Exception Close();
+
+ private:
+  bool is_socket_initiated_ = false;
+  SOCKET socket_ = INVALID_SOCKET;
+};
+
+}  // namespace nearby::windows
+
+#endif  // THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_WINDOWS_NEARBY_CLIENT_SOCKET_H_