[GitHub] [nifi-minifi-cpp] fgerlits commented on a change in pull request #1208: MINIFICPP-1678 Create PutUDP processor

[GitBox <gi...@apache.org>]

fgerlits commented on a change in pull request #1208:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1208#discussion_r777609848



##########
File path: extensions/standard-processors/tests/unit/PutUDPTests.cpp
##########
@@ -0,0 +1,112 @@
+/**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *     http://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 <memory>
+#include <new>
+#include <random>
+#include <string>
+#include "SingleInputTestController.h"
+#include "PutUDP.h"
+#include "utils/net/DNS.h"
+#include "utils/net/Socket.h"
+#include "utils/expected.h"
+#include "utils/StringUtils.h"
+
+namespace org::apache::nifi::minifi::processors {
+
+namespace {
+struct DatagramListener {
+  DatagramListener(const char* const hostname, const char* const port)
+    :resolved_names_{utils::net::resolveHost(hostname, port, utils::net::IpProtocol::Udp).value()},
+     open_socket_{utils::net::open_socket(resolved_names_.get())
+        | utils::valueOrElse([=]() -> utils::net::OpenSocketResult { throw std::runtime_error{utils::StringUtils::join_pack("Failed to connect to ", hostname, " on port ", port)}; })}
+  {
+    const auto bind_result = bind(open_socket_.socket_.get(), open_socket_.selected_name->ai_addr, open_socket_.selected_name->ai_addrlen);
+    if (bind_result == utils::net::SocketError) {
+      throw std::runtime_error{utils::StringUtils::join_pack("bind: ", utils::net::get_last_socket_error().message())};
+    }
+  }
+
+  struct ReceiveResult {
+    std::string remote_address;
+    std::string message;
+  };
+
+  [[nodiscard]] ReceiveResult receive(const size_t max_message_size = 8192) const {
+    ReceiveResult result;
+    result.message.resize(max_message_size);
+    sockaddr_storage remote_address{};
+    socklen_t addrlen = sizeof(remote_address);
+    const auto recv_result = recvfrom(open_socket_.socket_.get(), result.message.data(), result.message.size(), 0, std::launder(reinterpret_cast<sockaddr*>(&remote_address)), &addrlen);

Review comment:
       makes sense, thanks!




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