330 lines
8.7 KiB
C++
330 lines
8.7 KiB
C++
#include "asyncdbconnection.h"
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#include "waithandlelist.h"
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#include "scopeguard.h"
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#include <chrono>
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ASyncDBConnection::ASyncDBConnection()
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{
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}
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ASyncDBConnection::State ASyncDBConnection::state() const
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{
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return m_threadData.m_state;
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}
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//void ASyncDBConnection::setupConnection(const std::string &connstring)
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//{
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// if (m_thread.joinable()) {
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// m_threadData.stop();
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// m_thread.join();
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// }
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// m_threadData.m_initString = connstring;
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// m_thread = std::thread([this] () { m_threadData.run(); });
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//}
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void ASyncDBConnection::setupConnection(const ConnectionConfig &config)
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{
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if (m_thread.joinable()) {
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m_threadData.stop();
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m_thread.join();
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}
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m_threadData.m_config = config;
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m_thread = std::thread([this] () { m_threadData.run(); });
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}
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void ASyncDBConnection::closeConnection()
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{
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m_threadData.stop();
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if (m_thread.joinable()) {
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m_thread.join();
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}
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}
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bool ASyncDBConnection::send(const std::string &command, on_result_callback on_result)
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{
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{
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std::lock_guard<std::mutex> lg(m_threadData.m_commandQueue.m_mutex);
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m_threadData.m_commandQueue.m_queue.emplace(command, on_result);
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m_threadData.m_commandQueue.m_newEvent.set();
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}
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return true;
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}
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bool ASyncDBConnection::cancel()
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{
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return m_threadData.cancel();
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}
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void ASyncDBConnection::setStateCallback(on_state_callback state_callback)
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{
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std::lock_guard<std::mutex> lg(m_threadData.m_stateCallback.m_mutex);
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m_threadData.m_stateCallback.m_func = state_callback;
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}
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void ASyncDBConnection::setNoticeCallback(on_notice_callback notice_callback)
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{
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std::lock_guard<std::mutex> lg(m_threadData.m_noticeCallback.m_mutex);
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m_threadData.m_noticeCallback.m_func = notice_callback;
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}
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ASyncDBConnection::Thread::Thread()
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: m_stopEvent(Win32Event::Reset::Manual, Win32Event::Initial::Clear)
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{}
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void ASyncDBConnection::Thread::run()
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{
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m_terminated = false;
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SCOPE_EXIT {
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m_state = State::NotConnected;
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m_terminated = true;
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};
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while (!terminateRequested) {
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// make or recover connection
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if (makeConnection()) {
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m_connection.setNoticeReceiver(
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[this](const PGresult *result) { processNotice(result); });
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m_canceller = m_connection.getCancel();
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// send commands and receive results
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communicate();
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}
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else {
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// It is not possible to determine the source of the problem.
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// Accept for PQconnectionNeedsPassword
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// Pass problem to main thread and stop this thread
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// Main thread needs to know it has to restart connecting if it want's to.
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// TODO: add status functions to help main thread so it doesn't have to remember
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// everything reported through callbacks.
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break;
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}
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}
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// close connection
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}
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bool ASyncDBConnection::Thread::cancel()
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{
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return m_canceller.cancel(nullptr);
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}
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bool ASyncDBConnection::Thread::makeConnection()
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{
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using namespace std::chrono_literals;
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while (!terminateRequested) {
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// start connecting
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//bool ok = m_connection.connectStart(m_initString + " client_encoding=utf8");
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auto keywords = m_config.getKeywords();
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auto values = m_config.getValues();
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bool ok = m_connection.connectStart(keywords, values);
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auto start = std::chrono::steady_clock::now();
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if (ok && m_connection.status() != CONNECTION_BAD) {
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int sock = m_connection.socket();
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Win32Event socket_event(Win32Event::Reset::Auto, Win32Event::Initial::Clear);
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long fd = FD_WRITE;
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while (true) {
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// poll till complete or failed (we can get an abort command)
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WSAEventSelect(sock, socket_event.handle(), fd);
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WaitHandleList whl;
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auto wait_result_socket_event = whl.add(socket_event);
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auto wait_result_stop = whl.add(m_stopEvent);
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auto nu = std::chrono::steady_clock::now();
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std::chrono::duration<float, std::milli> diff = -(nu-start);
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diff += 30s;
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DWORD timeout = diff.count();
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DWORD res = MsgWaitForMultipleObjectsEx(
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whl.count(), // _In_ DWORD nCount,
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whl, // _In_ const HANDLE *pHandles,
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timeout, // _In_ DWORD dwMilliseconds,
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0, // _In_ DWORD dwWakeMask,
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0 // _In_ DWORD dwFlags
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);
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if (res == wait_result_socket_event) {
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auto poll_state = m_connection.connectPoll();
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if (poll_state == PGRES_POLLING_OK) {
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// if connected return true
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doStateCallback(State::Connected);
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return true;
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}
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else if (poll_state == PGRES_POLLING_FAILED) {
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doStateCallback(State::NotConnected);
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return false;
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}
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else if (poll_state == PGRES_POLLING_READING) {
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doStateCallback(State::Connecting);
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fd = FD_READ;
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}
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else if (poll_state == PGRES_POLLING_WRITING) {
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doStateCallback(State::Connecting);
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fd = FD_WRITE;
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}
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}
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else if (res == wait_result_stop) {
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}
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} // end while (true)
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}
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}
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return false;
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}
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void ASyncDBConnection::Thread::communicate()
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{
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while (!terminateRequested) {
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// wait for something to do:
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// - command to send to server
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// - wait for results and (notifies can also come in)
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// - pass each result on to the completion routine
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// - notify comming in from the server
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// - pass to notify callback
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// - connection raises an error
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// - return
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// - stop signal
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// - return
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if (m_state == State::Connected) {
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waitForAndSendCommand();
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}
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else if (m_state == State::QuerySend || m_state == State::CancelSend) {
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// Wait for result, even after a cancel we should wait, for all results
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// New command's are not excepted when one has been send
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waitForResult();
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}
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}
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}
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void ASyncDBConnection::Thread::stop()
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{
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terminateRequested = true;
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m_stopEvent.set();
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}
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void ASyncDBConnection::Thread::doStateCallback(State state)
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{
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m_state = state;
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std::lock_guard<std::mutex> lg(m_stateCallback.m_mutex);
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if (m_stateCallback.m_func) {
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m_stateCallback.m_func(state);
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}
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}
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void ASyncDBConnection::Thread::waitForAndSendCommand()
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{
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WaitHandleList whl;
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auto wait_result_new_command = whl.add(m_commandQueue.m_newEvent);
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auto wait_result_stop = whl.add(m_stopEvent);
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DWORD res = MsgWaitForMultipleObjectsEx(
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whl.count(), // _In_ DWORD nCount,
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whl, // _In_ const HANDLE *pHandles,
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INFINITE, // _In_ DWORD dwMilliseconds,
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0, // _In_ DWORD dwWakeMask,
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0 // _In_ DWORD dwFlags
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);
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if (res == wait_result_new_command) {
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doNewCommand();
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}
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// if (res == wait_result_stop) return;
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}
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void ASyncDBConnection::Thread::doNewCommand()
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{
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// todo: send command
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// get command from top of queue (but leave it in the queue, we need the callback)
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std::string command;
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{
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std::lock_guard<std::mutex> lg(m_commandQueue.m_mutex);
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if (! m_commandQueue.m_queue.empty()) {
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command = m_commandQueue.m_queue.front().command;
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}
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}
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if (!command.empty() && m_connection.sendQuery(command)) {
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doStateCallback(State::QuerySend);
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}
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else {
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std::string error = m_connection.getErrorMessage();
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// todo: need to report the error
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}
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}
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void ASyncDBConnection::Thread::waitForResult()
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{
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int sock = m_connection.socket();
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Win32Event socket_event(Win32Event::Reset::Manual, Win32Event::Initial::Clear);
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long fd = FD_READ | FD_CLOSE;
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bool finished = false;
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while ( ! finished) {
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WSAEventSelect(sock, socket_event.handle(), fd);
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WaitHandleList whl;
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auto wait_result_socket = whl.add(socket_event);
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auto wait_result_stop = whl.add(m_stopEvent);
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DWORD res = MsgWaitForMultipleObjectsEx(
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whl.count(), // _In_ DWORD nCount,
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whl, // _In_ const HANDLE *pHandles,
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INFINITE, // _In_ DWORD dwMilliseconds,
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0, // _In_ DWORD dwWakeMask,
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0 // _In_ DWORD dwFlags
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);
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if (res == wait_result_socket) {
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WSANETWORKEVENTS net_events;
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WSAEnumNetworkEvents(sock, socket_event.handle(), &net_events);
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if (net_events.lNetworkEvents & FD_READ) {
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if (m_connection.consumeInput()) {
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while ( ! finished && ! m_connection.isBusy()) {
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auto res(m_connection.getResult());
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{
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std::lock_guard<std::mutex> lg(m_commandQueue.m_mutex);
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m_commandQueue.m_queue.front().on_result(res);
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if (res == nullptr) {
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m_commandQueue.m_queue.pop();
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doStateCallback(State::Connected);
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finished = true;
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}
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}
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}
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// else is still waiting for more data
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}
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else {
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// error during consume
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}
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}
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}
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if (res == wait_result_stop) {
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// Send cancel, close connection and terminate thread
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cancel();
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doStateCallback(State::Terminating);
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finished = true;
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}
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} // end while
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// When last result received, remove command from queue
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}
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void ASyncDBConnection::Thread::processNotice(const PGresult *result)
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{
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// Pgsql::Result res(result);
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std::lock_guard<std::mutex> lg(m_noticeCallback.m_mutex);
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if (m_noticeCallback.m_func) {
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Pgsql::ErrorDetails details = Pgsql::ErrorDetails::createErrorDetailsFromPGresult(result);
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m_noticeCallback.m_func(details);
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}
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}
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