mirror of
https://github.com/cculianu/Fulcrum.git
synced 2026-08-16 13:01:07 +02:00
6df916565a
Also in this commit various nits and subtle bugs prevented. Refactored the 'Stats' mechanism to return a generic QVariant rather than QVariantMap, which is more flexible. Misc. other nits.
511 lines
21 KiB
C++
511 lines
21 KiB
C++
#include "Servers.h"
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#include <QCoreApplication>
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#include <QtNetwork>
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#include <QString>
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#include <QTextStream>
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#include <QByteArray>
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#include <QTextCodec>
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#include <QTimer>
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#include <cstdlib>
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TcpServerError::~TcpServerError() {} // for vtable
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AbstractTcpServer::AbstractTcpServer(const QHostAddress &a, quint16 p)
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: QTcpServer(nullptr), IdMixin(newId()), addr(a), port(p)
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{
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assert(qobj()); // Runtime check that derived class followed the rules outlined at the top of Mixins.h
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_thread.setObjectName(prettyName());
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setObjectName(prettyName());
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}
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AbstractTcpServer::~AbstractTcpServer()
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{
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Debug() << __FUNCTION__;
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stop();
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}
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QString AbstractTcpServer::hostPort() const
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{
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return QString("%1:%2").arg(addr.toString()).arg(port);
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}
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QString AbstractTcpServer::prettyName() const
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{
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return QString("Srv %1 (id: %2)").arg(hostPort()).arg(id);
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}
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void AbstractTcpServer::tryStart(ulong timeout_ms)
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{
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if (!_thread.isRunning()) {
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ThreadObjectMixin::start(); // call super
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Log() << "Starting listener service for " << prettyName() << " ...";
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if (auto result = chan.get<QString>(timeout_ms); result != "ok") {
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result = result.isEmpty() ? "Startup timed out!" : result;
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throw TcpServerError(result);
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}
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Log() << "Service started, listening for connections on " << hostPort();
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} else {
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throw TcpServerError(prettyName() + " already started");
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}
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}
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void AbstractTcpServer::on_started()
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{
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QString result = "ok";
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conns.push_back(connect(this, SIGNAL(newConnection()), this,SLOT(pvt_on_newConnection())));
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conns.push_back(connect(this, &QTcpServer::acceptError, this, [this](QAbstractSocket::SocketError e){ on_acceptError(e);}));
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if (!listen(addr, port)) {
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result = errorString();
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result = result.isEmpty() ? "Error binding/listening for connections" : QString("Could not bind to %1: %2").arg(hostPort()).arg(result);
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Debug() << __FUNCTION__ << " listen failed";
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} else {
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Debug() << "started ok";
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}
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chan.put(result);
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}
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void AbstractTcpServer::on_finished()
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{
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close(); /// stop listening
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chan.put("finished");
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Debug() << objectName() << " finished.";
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ThreadObjectMixin::on_finished();
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}
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void AbstractTcpServer::on_acceptError(QAbstractSocket::SocketError e)
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{
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Error() << objectName() << "; error acceptError, code: " << int(e);
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}
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/*static*/
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QString AbstractTcpServer::prettySock(QAbstractSocket *sock)
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{
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return QString("%1:%2")
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.arg(sock ? sock->peerAddress().toString() : "(null)")
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.arg(sock ? sock->peerPort() : 0);
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}
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void AbstractTcpServer::pvt_on_newConnection()
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{
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QTcpSocket *sock = nextPendingConnection();
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if (sock) {
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Debug() << "Got connection from: " << prettySock(sock);
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on_newConnection(sock);
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} else {
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Warning() << __FUNCTION__ << ": nextPendingConnection returned a nullptr! Called at the wrong time? FIXME!";
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}
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}
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SimpleHttpServer::SimpleHttpServer(const QHostAddress &listenAddr, quint16 listenPort, qint64 maxBuffer, qint64 timeLimit)
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: AbstractTcpServer(listenAddr, listenPort), MAX_BUFFER(maxBuffer > 0 ? maxBuffer : DEFAULT_MAX_BUFFER),
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TIME_LIMIT(timeLimit)
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{
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// re-set name for debug/logging
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_thread.setObjectName(prettyName());
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setObjectName(prettyName());
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}
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QString SimpleHttpServer::prettyName() const
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{
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return QString("Http%1").arg(AbstractTcpServer::prettyName());
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}
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void SimpleHttpServer::on_newConnection(QTcpSocket *sock)
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{
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sock->setReadBufferSize(MAX_BUFFER);
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const QString sockName(prettySock(sock));
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connect(sock, &QAbstractSocket::disconnected, this, [sock,sockName] {
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Debug() << sockName << " disconnected";
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sock->deleteLater();
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});
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connect(sock, &QObject::destroyed, this, [sockName](QObject *){
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Debug() << sockName << " destroyed";
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});
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connect(sock, &QAbstractSocket::readyRead, this, [sock,sockName,this] {
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try {
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while(sock->canReadLine()) {
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auto line = QString(sock->readLine()).trimmed();
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//Debug() << sockName << " Got line: " << line;
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if (QString loc = sock->property("req-loc").toString(); loc.isEmpty()) {
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auto toks = line.split(" ");
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if (toks.length() != 3 || (toks[0] != "GET" && toks[1] != "POST") || toks[2] != "HTTP/1.1")
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throw Exception(QString("Invalid request: %1").arg(line));
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Trace() << sockName << " " << line;
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sock->setProperty("req-loc", toks[1]);
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sock->setProperty("req-meth", toks[0]);
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sock->setProperty("req-ver", toks[2]);
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} else if (auto loc = sock->property("req-loc").toString(),
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meth = sock->property("req-meth").toString(),
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ver = sock->property("req-ver").toString();
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line.isEmpty() && !loc.isEmpty() && !meth.isEmpty() && !ver.isEmpty()) {
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// got line by itself, prepare response
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Request req;
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auto & response = req.response;
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req.httpVersion = ver;
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req.method = meth == "GET" ? Method::GET : Method::POST;
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auto vmap = sock->property("req-header").toMap();
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for (auto it = vmap.begin(); it != vmap.end(); ++it)
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// save header
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req.header[it.key()] = it.value().toString();
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if (auto i = loc.indexOf('?'); i > -1) {
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req.queryString = loc.mid(i+1);
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req.endPoint = loc.left(i);
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} else
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req.endPoint = loc;
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if (auto it = endPoints.find(req.endPoint); it != endPoints.end() || (it=endPoints.find("*")) != endPoints.end()) {
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it.value()(req); // call lambda
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} else {
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// could not find any enpoints that match, set up a 404 response
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response.status = 404;
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response.statusText = "Unknown resource";
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response.data = err404Msg.toUtf8();
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}
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// setup header
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QByteArray responseHeader;
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{
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QTextStream ss(&responseHeader, QIODevice::WriteOnly);
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ss.setCodec(QTextCodec::codecForName("UTF-8"));
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ss << "HTTP/1.1 " << response.status << " " << req.response.statusText.trimmed() << "\r\n";
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ss << "Content-Type: " << response.contentType.trimmed() << "\r\n";
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ss << "Content-Length: " << response.data.length() << "\r\n";
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ss << response.headerExtra;
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ss << "\r\n";
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}
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const qint64 respTotalLen = responseHeader.length() + response.data.length();
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sock->setProperty("resp-len", respTotalLen);
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// write out header
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sock->write(responseHeader);
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if (response.data.length())
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// write out response data
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sock->write(response.data);
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} else {
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// save params
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auto vmap = sock->property("req-header").toMap();
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auto toks = line.split(": ");
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if (toks.length() >= 2) {
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auto name = toks.front(); toks.pop_front();
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auto value = toks.join(": ");
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vmap[name] = value;
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sock->setProperty("req-header", vmap);
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} else
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throw Exception("garbage data, closing connection");
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}
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}
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if (sock->bytesAvailable() > MAX_BUFFER)
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throw Exception("too much data, closing connection");
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} catch (const std::exception &e) {
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Warning() << "Client: " << sockName << "; " << e.what();
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sock->abort();
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sock->deleteLater();
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}
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});
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connect(sock, &QAbstractSocket::bytesWritten, this, [sock, sockName](qint64 bytes) {
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qint64 nWrit = sock->property("resp-written").toLongLong() + bytes;
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sock->setProperty("resp-written", nWrit);
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auto var = sock->property("resp-len");
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if (const auto n2write = var.toLongLong(); !var.isNull() && nWrit >= n2write) {
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// graceful disconnect
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Debug() << sockName << " wrote " << nWrit << "/" << n2write << " bytes, disconnecting";
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sock->disconnectFromHost();
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} else {
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Trace() << sockName << " wrote: " << bytes << " bytes";
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}
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});
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if (TIME_LIMIT > 0) {
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QTimer::singleShot(TIME_LIMIT, sock, [sock, sockName, this]{
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Debug() << sockName << " killing connection after " << (TIME_LIMIT/1e3) << " seconds";
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sock->abort();
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sock->deleteLater();
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});
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}
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}
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void SimpleHttpServer::addEndpoint(const QString &endPoint, const Lambda &callback)
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{
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if (!endPoint.startsWith("/") && endPoint != "*")
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Warning() << __FUNCTION__ << " endPoint " << endPoint << " does not start with '/' -- it will never be reached! FIXME!";
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endPoints[endPoint] = callback;
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}
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// ---- Classes Server & Client ----
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// class Server constants
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namespace {
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// TODO: maybe move these to a more global place? For now here is fine.
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namespace Constants {
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constexpr int kMaxServerVersion = 80, ///< the maximum server version length we accept to prevent memory exhaustion attacks
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kScriptHashLength = 256/8, ///< the length of a scripthash in bytes. sha256 = 32 bytes.
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kMaxBuffer = 4*1000*1000, ///< =4MB. The max buffer we use in Client (ElectronX client). TODO: Make this tune-able and configurable!
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kMaxErrorCount = 10; ///< The maximum number of errors we tolerate from a Client before disconnecting them.
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}
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using namespace Constants;
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}
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Server::Server(const QHostAddress &a, quint16 p)
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: AbstractTcpServer(a, p)
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{
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// re-set name for debug/logging
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_thread.setObjectName(prettyName());
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setObjectName(prettyName());
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StaticData::init(); // only does something first time it's called, otherwise a no-op
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}
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Server::~Server() { stop(); } // paranoia about pure virtual, and vtable consistency, etc
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QString Server::prettyName() const
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{
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return QString("Tcp%1").arg(AbstractTcpServer::prettyName());
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}
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// this must be called in the thread context of this thread
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QVariantMap Server::stats() const
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{
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QVariantMap ret;
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ret["numClients"] = clientsById.count();
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QVariantList clientList;
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for (const auto & client : clientsById) {
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// note we call this thread-unsafe function stats() here because client lives in our thread. but if that design
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// changes, update this to call client->statsSafe(100) instead
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auto map = client->stats().toMap();
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auto name = map.take("name").toString();
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map["version"] = QVariantList({client->info.userAgent, client->info.protocolVersion});
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map["errCt"] = client->info.errCt;
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map["nRequestsRcv"] = client->info.nRequestsRcv;
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// the below don't really make much sense for this class (they are always 0 or empty)
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map.remove("nDisconnects");
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map.remove("nSocketErrors");
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map.remove("lastSocketError");
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map.remove("nUnansweredRequests");
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map.remove("nRequestsSent");
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clientList.append(QVariantMap({{name, map}}));
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}
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ret["clients"] = clientList;
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return ret;
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}
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void Server::on_started()
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{
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AbstractTcpServer::on_started();
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conns.push_back(connect(this, &Server::tellClientScriptHashStatus, this, &Server::_tellClientScriptHashStatus));
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}
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void Server::on_newConnection(QTcpSocket *sock) { newClient(sock); }
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Client *
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Server::newClient(QTcpSocket *sock)
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{
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const auto clientId = newId();
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auto ret = clientsById[clientId] = new Client(rpcMethods(), clientId, this, sock);
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// if deleted, we need to purge it from map
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auto on_destroyed = [clientId, this](QObject *o) {
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// this whole call is here so that delete client->sock ends up auto-removing the map entry
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// as a convenience.
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Debug() << "Client nested 'on_destroyed' called";
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auto client = clientsById.take(clientId);
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if (client) {
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if (client != o) {
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Error() << " client != passed-in pointer to on_destroy in " << __FILE__ << " line " << __LINE__ << ". FIXME!";
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}
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Debug("client id %ld purged from map", long(clientId));
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}
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};
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connect(ret, &QObject::destroyed, this, on_destroyed);
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connect(ret, &AbstractConnection::lostConnection, this, [this,clientId](AbstractConnection *cl){
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if (auto client = dynamic_cast<Client *>(cl) ; client) {
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Debug() << client->prettyName() << " lost connection";
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emit clientDisconnected(client->id);
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killClient(client);
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} else {
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Error() << "Internal error: lostConnection callback received null client! (expected client id: " << clientId << ")";
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}
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});
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connect(ret, &RPC::ConnectionBase::gotMessage, this, &Server::onMessage);
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connect(ret, &RPC::ConnectionBase::gotErrorMessage, this, &Server::onErrorMessage);
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connect(ret, &RPC::ConnectionBase::peerError, this, &Server::onPeerError);
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return ret;
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}
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void Server::killClient(Client *client)
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{
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if (!client)
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return;
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Debug() << __FUNCTION__ << " (id: " << client->id << ")";
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clientsById.remove(client->id); // ensure gone from map asap so future lookups fail
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client->do_disconnect();
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}
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void Server::killClient(quint64 clientId)
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{
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killClient(clientsById.take(clientId));
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}
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void Server::onMessage(quint64 clientId, const RPC::Message &m)
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{
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Trace() << "onMessage: " << clientId << " json: " << m.toJsonString();
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if (Client *c = getClient(clientId); c) {
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auto member = StaticData::dispatchTable.value(m.method);
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if (!member)
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Error() << "Unknown method: \"" << m.method << "\". This shouldn't happen. FIXME! Json: " << m.toJsonString();
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else {
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// indicate a good request, accepted request
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++c->info.nRequestsRcv;
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// call ptr to member
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(this->*member)(c, m);
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}
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} else {
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Debug() << "Unknown client: " << clientId;
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}
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}
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void Server::onErrorMessage(quint64 clientId, const RPC::Message &m)
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{
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Trace() << "onErrorMessage: " << clientId << " json: " << m.toJsonString();
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if (Client *c = getClient(clientId); c) {
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// we never expect client to send us errors. Always return invalid request, disconnect client.
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emit c->sendError(true, RPC::Code_InvalidRequest, "Not a valid request object");
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}
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}
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void Server::onPeerError(quint64 clientId, const QString &what)
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{
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Debug() << "onPeerError, client " << clientId << " error: " << what;
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if (Client *c = getClient(clientId); c) {
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if (++c->info.errCt - c->info.nRequestsRcv >= kMaxErrorCount) {
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Warning() << "Excessive errors (" << kMaxErrorCount << ") for: " << c->prettyName() << ", disconnecting";
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killClient(c);
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return;
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}
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}
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}
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// --- RPC METHODS ---
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void Server::rpc_server_version(Client *c, const RPC::Message &m)
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{
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if (QVariantList l = m.paramsList(); m.isRequest() && l.size() == 2) {
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c->info.userAgent = l[0].toString().left(kMaxServerVersion);
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c->info.protocolVersion = l[1].toString().left(kMaxServerVersion);
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Trace() << "Client (id: " << c->id << ") sent version: \"" << c->info.userAgent << "\" / \"" << c->info.protocolVersion << "\"";
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} else {
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Error() << "Bad server version message! Other code should have handled this. FIXME! Json: " << m.toJsonString();
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}
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emit c->sendResult(m.id, m.method, QStringList({QString("%1/%2").arg(APPNAME).arg(VERSION), QString("1.4")}));
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}
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void Server::rpc_server_ping(Client *c, const RPC::Message &m)
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{
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if (m.isRequest()) {
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Trace() << "Got ping from client (id: " << c->id << "), responding...";
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emit c->sendResult(m.id, m.method);
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} else {
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Error() << "Bad client ping message! This shouldn't happen. FIXME! Json: " << m.toJsonString();
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}
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}
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void Server::rpc_blockchain_scripthash_subscribe(Client *c, const RPC::Message &m)
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{
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if (QVariantList l = m.paramsList(); m.isRequest() && l.size() == 1) {
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// TESTING TODO FIXME THIS IS FOR TESTING ONLY
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const auto clientId = c->id;
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QByteArray sh = QByteArray::fromHex(l.front().toString().trimmed().left(kScriptHashLength*2).toUtf8());
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if (sh.length() != kScriptHashLength) {
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emit c->sendError(false, RPC::Code_InvalidParams, "Invalid scripthash", m.id);
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return;
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}
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emit tellClientScriptHashStatus(clientId, m.id, QByteArray(kScriptHashLength, 0));
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QTimer *t = new QTimer(c);
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connect(t, &QTimer::timeout, this, [sh, clientId, this] {
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auto val = QRandomGenerator::global()->generate64();
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emit tellClientScriptHashStatus(clientId, RPC::Message::Id(), QByteArray(reinterpret_cast<char *>(&val), sizeof(val)), sh);
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});
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t->setSingleShot(false); t->start(3000);
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} else {
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Error() << "Bad subscribe message! This shouldn't happen. FIXME! Json: " << m.toJsonString();
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}
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}
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// --- Server::StaticData Definitions ---
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#define HEY_COMPILER_PUT_STATIC_HERE(x) decltype(x) x
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HEY_COMPILER_PUT_STATIC_HERE(Server::StaticData::dispatchTable);
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HEY_COMPILER_PUT_STATIC_HERE(Server::StaticData::methodMap);
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HEY_COMPILER_PUT_STATIC_HERE(Server::StaticData::registry){
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/* ==> Note: Add stuff to this table when adding new RPC methods.
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{ {"rpc.name", allow_requests, allow_notifications, nPosArgs, (QSet<QString> note: {} means undefined optional)}, &method_to_call } */
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{ {"server.ping", true, false, 0, RPC::KeySet{} }, &Server::rpc_server_ping },
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{ {"server.version", true, false, 2, }, &Server::rpc_server_version },
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{ {"blockchain.scripthash.subscribe", true, false, 1, }, &Server::rpc_blockchain_scripthash_subscribe },
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};
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#undef HEY_COMPILER_PUT_STATIC_HERE
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/*static*/
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void Server::StaticData::init()
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{
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if (!dispatchTable.empty())
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return;
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for (const auto & r : registry) {
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if (!r.member) {
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Error() << "Runtime check failed: RPC Method " << r.method << " has a nullptr for its .member! See Server class! FIXME!";
|
|
std::_Exit(EXIT_FAILURE);
|
|
}
|
|
methodMap[r.method] = r;
|
|
dispatchTable[r.method] = r.member;
|
|
}
|
|
}
|
|
// --- /Server::StaticData Definitions ---
|
|
// --- /RPC METHODS ---
|
|
|
|
|
|
void Server::_tellClientScriptHashStatus(quint64 clientId, const RPC::Message::Id & refId, const QByteArray & status, const QByteArray & scriptHash)
|
|
{
|
|
if (Client *client = getClient(clientId); client) {
|
|
if (scriptHash.isEmpty())
|
|
// immediate scripthash status result
|
|
client->sendResult(refId, "blockchain.scripthash.subscribe", status.toHex());
|
|
else {
|
|
// notification, no id.
|
|
client->sendNotification("blockchain.scripthash.subscribe", {scriptHash.toHex(), status.toHex()});
|
|
}
|
|
} else {
|
|
Debug() << "ClientId: " << clientId << " not found.";
|
|
}
|
|
}
|
|
|
|
Client::Client(const RPC::MethodMap & mm, quint64 id_in, Server *srv, QTcpSocket *sock)
|
|
: RPC::LinefeedConnection(mm, id_in, sock, kMaxBuffer), srv(srv)
|
|
{
|
|
socket = sock;
|
|
Q_ASSERT(socket->state() == QAbstractSocket::ConnectedState);
|
|
status = Connected ; // we are always connected at construction time.
|
|
errorPolicy = ErrorPolicySendErrorMessage;
|
|
setObjectName(QString("Client.%1").arg(id_in));
|
|
on_connected();
|
|
Debug() << prettyName() << " new client";
|
|
}
|
|
|
|
Client::~Client()
|
|
{
|
|
Debug() << __PRETTY_FUNCTION__;
|
|
socket = nullptr; // NB: we are a child of socket. this line here is added in case some day I make AbstractClient delete socket on destruct.
|
|
}
|
|
|
|
void Client::do_disconnect(bool graceful)
|
|
{
|
|
const bool wasConnected = socket ? socket->state() == QAbstractSocket::ConnectedState : false;
|
|
AbstractConnection::do_disconnect(graceful); // if 'graceful' *AND* was connected, a disconnected state will be entered later at which point we will delete socket.
|
|
if (socket && (!graceful || !wasConnected))
|
|
/// delete the socket if we weren't connected or if !graceful.
|
|
/// If graceful && connected, then a disconnect signal will be sent later and then we will
|
|
/// reenter here and delete the socket.
|
|
socket->deleteLater(); // side-effect: will implicitly delete 'this' because we are a child of the socket!
|
|
else if (socket && graceful)
|
|
Debug() << __FUNCTION__ << " (graceful); delayed socket delete (wait for disconnect) ...";
|
|
}
|
|
|
|
void Client::do_ping()
|
|
{
|
|
// Don't send clients pings.
|
|
// Instead, rely on them to ping us else disconnect them if idle for too long.
|
|
// The below just checks idle.
|
|
if (Util::getTime() - lastGood >= stale_threshold) {
|
|
Debug() << prettyName() << ": idle timeout after " << ((stale_threshold)/1e3) << " sec., will close connection";
|
|
emit sendError(true, RPC::Code_Custom+1, "Idle time exceeded");
|
|
return;
|
|
}
|
|
}
|