Add initial webserver sources

test/webserver_example/errorresponsehandler.cpp

@@ -0,0 +1,58 @@
+#include "errorresponsehandler.h"
+
+// esp-idf includes
+#include <asio.hpp>
+#include <esp_log.h>
+
+// 3rdparty lib includes
+#include <fmt/core.h>
+#include <asio_webserver/clientconnection.h>
+
+namespace {
+constexpr const char * const TAG = "ASIO_WEBSERVER";
+} // namespace
+
+ErrorResponseHandler::ErrorResponseHandler(ClientConnection &clientConnection, std::string_view path) :
+    m_clientConnection{clientConnection},
+    m_path{path}
+{
+    ESP_LOGI(TAG, "constructed for %.*s (%s:%hi)", path.size(), path.data(),
+             m_clientConnection.remote_endpoint().address().to_string().c_str(), m_clientConnection.remote_endpoint().port());
+}
+
+ErrorResponseHandler::~ErrorResponseHandler()
+{
+    ESP_LOGI(TAG, "destructed for %.*s (%s:%hi)", m_path.size(), m_path.data(),
+             m_clientConnection.remote_endpoint().address().to_string().c_str(), m_clientConnection.remote_endpoint().port());
+}
+
+void ErrorResponseHandler::requestHeaderReceived(std::string_view key, std::string_view value)
+{
+}
+
+void ErrorResponseHandler::sendResponse()
+{
+    ESP_LOGI(TAG, "sending response for %.*s (%s:%hi)", m_path.size(), m_path.data(),
+             m_clientConnection.remote_endpoint().address().to_string().c_str(), m_clientConnection.remote_endpoint().port());
+
+    m_response = fmt::format("Error 404 Not Found: {}", m_path);
+
+    m_response = fmt::format("HTTP/1.1 404 Not Found\r\n"
+                             "Connection: close\r\n"
+                             "Content-Type: text/plain\r\n"
+                             "Content-Length: {}\r\n"
+                             "\r\n"
+                             "{}", m_response.size(), m_response);
+
+    asio::async_write(m_clientConnection.socket(),
+                      asio::buffer(m_response.data(), m_response.size()),
+                      [this, self=m_clientConnection.shared_from_this()](std::error_code ec, std::size_t length)
+                      { written(ec, length); });
+}
+
+void ErrorResponseHandler::written(std::error_code ec, std::size_t length)
+{
+    ESP_LOGI(TAG, "expected=%zd actual=%zd for %.*s (%s:%hi)", m_response.size(), length, m_path.size(), m_path.data(),
+             m_clientConnection.remote_endpoint().address().to_string().c_str(), m_clientConnection.remote_endpoint().port());
+    m_clientConnection.responseFinished(ec);
+}