Implemented gatt discovery and setting gatt characteristics

internal/platform/implementation/linux/ble_v2_server_socket.cc

@@ -0,0 +1,86 @@
+// Copyright 2024 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/linux/ble_v2_server_socket.h"
+
+#include <memory>
+
+#include "absl/synchronization/mutex.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/implementation/ble_v2.h"
+#include "internal/platform/implementation/linux/ble_v2_socket.h"
+#include "internal/platform/logging.h"
+
+namespace nearby {
+namespace linux {
+
+std::unique_ptr<api::ble_v2::BleSocket> BleV2ServerSocket::Accept() {
+  absl::MutexLock lock(&mutex_);
+  LOG(INFO) << "BleV2ServerSocket::Accept waiting for connection";
+
+  while (!closed_ && pending_sockets_.empty()) {
+    cond_.Wait(&mutex_);
+  }
+
+  if (closed_) {
+    LOG(INFO) << "BleV2ServerSocket::Accept socket is closed";
+    return nullptr;
+  }
+
+  std::unique_ptr<BleV2Socket> socket = std::move(pending_sockets_.front());
+  pending_sockets_.pop_front();
+
+  LOG(INFO) << "BleV2ServerSocket::Accept accepted connection";
+  return socket;
+}
+
+Exception BleV2ServerSocket::Close() {
+  absl::MutexLock lock(&mutex_);
+  LOG(INFO) << "BleV2ServerSocket::Close for service " << service_id_;
+
+  if (closed_) {
+    return {Exception::kSuccess};
+  }
+
+  closed_ = true;
+  
+  // Close all pending sockets
+  for (auto& socket : pending_sockets_) {
+    if (socket) {
+      socket->Close();
+    }
+  }
+  pending_sockets_.clear();
+  
+  cond_.SignalAll();
+
+  return {Exception::kSuccess};
+}
+
+void BleV2ServerSocket::AddPendingSocket(std::unique_ptr<BleV2Socket> socket) {
+  absl::MutexLock lock(&mutex_);
+  if (closed_) {
+    LOG(WARNING)
+        << "BleV2ServerSocket::AddPendingSocket socket is closed";
+    return;
+  }
+
+  pending_sockets_.push_back(std::move(socket));
+  cond_.SignalAll();
+  LOG(INFO) << "BleV2ServerSocket::AddPendingSocket added socket, "
+                    << "pending count: " << pending_sockets_.size();
+}
+
+}  // namespace linux
+}  // namespace nearby