Servatrice: refactor signal handling and permit config reloading

cockatrice/src/tab_admin.cpp

@@ -58,10 +58,13 @@ TabAdmin::TabAdmin(TabSupervisor *_tabSupervisor, AbstractClient *_client, bool
     connect(updateServerMessageButton, SIGNAL(clicked()), this, SLOT(actUpdateServerMessage()));
     shutdownServerButton = new QPushButton;
     connect(shutdownServerButton, SIGNAL(clicked()), this, SLOT(actShutdownServer()));
+    reloadConfigButton = new QPushButton;
+    connect(reloadConfigButton, SIGNAL(clicked()), this, SLOT(actReloadConfig()));
     
     QVBoxLayout *vbox = new QVBoxLayout;
     vbox->addWidget(updateServerMessageButton);
     vbox->addWidget(shutdownServerButton);
+    vbox->addWidget(reloadConfigButton);
     vbox->addStretch();
     
     adminGroupBox = new QGroupBox;
@@ -87,6 +90,7 @@ void TabAdmin::retranslateUi()
 {
     updateServerMessageButton->setText(tr("Update server &message"));
     shutdownServerButton->setText(tr("&Shut down server"));
+    reloadConfigButton->setText(tr("&Reload configuration"));
     adminGroupBox->setTitle(tr("Server administration functions"));
     
     unlockButton->setText(tr("&Unlock functions"));
@@ -110,6 +114,12 @@ void TabAdmin::actShutdownServer()
     }
 }
 
+void TabAdmin::actReloadConfig()
+{
+    Command_ReloadConfig cmd;
+    client->sendCommand(client->prepareAdminCommand(cmd));
+}
+
 void TabAdmin::actUnlock()
 {
     if (QMessageBox::question(this, tr("Unlock administration functions"), tr("Do you really want to unlock the administration functions?"), QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {

cockatrice/src/tab_admin.h

@@ -28,7 +28,7 @@ private:
     bool locked;
     AbstractClient *client;
     bool fullAdmin;
-    QPushButton *updateServerMessageButton, *shutdownServerButton;
+    QPushButton *updateServerMessageButton, *shutdownServerButton, *reloadConfigButton;
     QGroupBox *adminGroupBox;
     QPushButton *unlockButton, *lockButton;
 signals:
@@ -36,6 +36,7 @@ signals:
 private slots:
     void actUpdateServerMessage();
     void actShutdownServer();
+    void actReloadConfig();
     
     void actUnlock();
     void actLock();

common/pb/admin_commands.proto

@@ -2,6 +2,7 @@ message AdminCommand {
 	enum AdminCommandType {
 		UPDATE_SERVER_MESSAGE = 1000;
 		SHUTDOWN_SERVER = 1001;
+		RELOAD_CONFIG = 1002;
 	}
 	extensions 100 to max;
 }
@@ -19,3 +20,9 @@ message Command_ShutdownServer {
 	optional string reason = 1;
 	optional uint32 minutes = 2;
 }
+
+message Command_ReloadConfig {
+	extend AdminCommand {
+		optional Command_ReloadConfig ext = 1002;
+	}
+}

servatrice/CMakeLists.txt

@@ -14,6 +14,7 @@ SET(servatrice_SOURCES
     src/serversocketinterface.cpp
     src/settingscache.cpp
     src/isl_interface.cpp
+    src/signalhandler.cpp
     ${VERSION_STRING_CPP}
     src/smtp/emailaddress.cpp
     src/smtp/mimeattachment.cpp

servatrice/src/main.cpp

@@ -28,21 +28,16 @@
 #include "servatrice.h"
 #include "server_logger.h"
 #include "settingscache.h"
+#include "signalhandler.h"
 #include "rng_sfmt.h"
 #include "version_string.h"
 #include <google/protobuf/stubs/common.h>
-#ifdef Q_OS_UNIX
-#include <signal.h>
-#include <execinfo.h>
-#include <unistd.h>
-#endif
-
-#define SIGSEGV_TRACE_LINES 40
 
 RNG_Abstract *rng;
 ServerLogger *logger;
 QThread *loggerThread;
 SettingsCache *settingsCache;
+SignalHandler *signalhandler;
 
 /* Prototypes */
 
@@ -55,9 +50,6 @@ void myMessageOutput2(QtMsgType type, const char *msg);
 void myMessageOutput(QtMsgType type, const QMessageLogContext &, const QString &msg);
 void myMessageOutput2(QtMsgType type, const QMessageLogContext &, const QString &msg);
 #endif
-#ifdef Q_OS_UNIX
-void sigSegvHandler(int sig);
-#endif
 
 /* Implementations */
 
@@ -130,32 +122,6 @@ void myMessageOutput2(QtMsgType /*type*/, const QMessageLogContext &, const QStr
 }
 #endif
 
-#ifdef Q_OS_UNIX
-void sigSegvHandler(int sig)
-{
-    void *array[SIGSEGV_TRACE_LINES];
-    size_t size;
-
-    // get void*'s for all entries on the stack
-    size = backtrace(array, SIGSEGV_TRACE_LINES);
-
-    // print out all the frames to stderr
-    fprintf(stderr, "Error: signal %d:\n", sig);
-    backtrace_symbols_fd(array, size, STDERR_FILENO);
-
-	if (sig == SIGSEGV)
-		logger->logMessage("CRASH: SIGSEGV");
-	else if (sig == SIGABRT)
-		logger->logMessage("CRASH: SIGABRT");
-	
-	logger->deleteLater();
-	loggerThread->wait();
-	delete loggerThread;
-	
-	raise(sig);
-}
-#endif
-
 int main(int argc, char *argv[])
 {
 	QCoreApplication app(argc, argv);
@@ -202,23 +168,8 @@ int main(int argc, char *argv[])
 		qInstallMessageHandler(myMessageOutput2);
 #endif
 
-#ifdef Q_OS_UNIX	
+	signalhandler = new SignalHandler();
-	struct sigaction hup;
+
-	hup.sa_handler = ServerLogger::hupSignalHandler;
-	sigemptyset(&hup.sa_mask);
-	hup.sa_flags = 0;
-	hup.sa_flags |= SA_RESTART;
-	sigaction(SIGHUP, &hup, 0);
-	
-	struct sigaction segv;
-	segv.sa_handler = sigSegvHandler;
-	segv.sa_flags = SA_RESETHAND;
-	sigemptyset(&segv.sa_mask);
-	sigaction(SIGSEGV, &segv, 0);
-	sigaction(SIGABRT, &segv, 0);
-	
-	signal(SIGPIPE, SIG_IGN);
-#endif
 	rng = new RNG_SFMT;
 	
 	std::cerr << "Servatrice " << VERSION_STRING << " starting." << std::endl;
@@ -250,6 +201,7 @@ int main(int argc, char *argv[])
 	}
 	
 	delete rng;
+	delete signalhandler;
 	delete settingsCache;
 	
 	logger->deleteLater();

servatrice/src/main.h

@@ -2,6 +2,11 @@
 #define MAIN_H
 
 class ServerLogger;
+class QThread;
+class SettingsCache;
+
 extern ServerLogger *logger;
+extern QThread *loggerThread;
+extern SettingsCache *settingsCache;
 
 #endif

servatrice/src/server_logger.cpp

@@ -1,17 +1,11 @@
 #include "server_logger.h"
 #include "settingscache.h"
-#include <QSocketNotifier>
 #include <QFile>
 #include <QFileInfo>
 #include <QDir>
 #include <QTextStream>
 #include <QDateTime>
 #include <iostream>
-#ifdef Q_OS_UNIX
-# include <sys/types.h>
-# include <sys/socket.h>
-# include <unistd.h>
-#endif
 
 ServerLogger::ServerLogger(bool _logToConsole, QObject *parent)
     : QObject(parent), logToConsole(_logToConsole), flushRunning(false)
@@ -44,13 +38,6 @@ void ServerLogger::startLog(const QString &logFileName)
             logFile = 0;
             return;
         }
-
-#ifdef Q_OS_UNIX
-        ::socketpair(AF_UNIX, SOCK_STREAM, 0, sigHupFD);
-
-        snHup = new QSocketNotifier(sigHupFD[1], QSocketNotifier::Read, this);
-        connect(snHup, SIGNAL(activated(int)), this, SLOT(handleSigHup()));
-#endif
     } else
         logFile = 0;
     
@@ -119,35 +106,13 @@ void ServerLogger::flushBuffer()
     }
 }
 
-void ServerLogger::hupSignalHandler(int /*unused*/)
+void ServerLogger::rotateLogs()
 {
-#ifdef Q_OS_UNIX
     if (!logFile)
         return;
     
-    char a = 1;
-    ssize_t writeValue = ::write(sigHupFD[0], &a, sizeof(a));
-    Q_UNUSED(writeValue);
-#endif
-}
-
-void ServerLogger::handleSigHup()
-{
-#ifdef Q_OS_UNIX
-    if (!logFile)
-        return;
-    
-    snHup->setEnabled(false);
-    char tmp;
-    ssize_t readValue = ::read(sigHupFD[1], &tmp, sizeof(tmp));
-    Q_UNUSED(readValue);
-    
     logFile->close();
     logFile->open(QIODevice::Append);
-    
-    snHup->setEnabled(true);
-#endif
 }
 
 QFile *ServerLogger::logFile;
-int ServerLogger::sigHupFD[2];

servatrice/src/server_logger.h

@@ -7,7 +7,6 @@
 #include <QWaitCondition>
 #include <QStringList>
 
-class QSocketNotifier;
 class QFile;
 class Server_ProtocolHandler;
 
@@ -16,19 +15,16 @@ class ServerLogger : public QObject {
 public:
 	ServerLogger(bool _logToConsole, QObject *parent = 0);
 	~ServerLogger();
-	static void hupSignalHandler(int unused);
 public slots:
 	void startLog(const QString &logFileName);
 	void logMessage(QString message, void *caller = 0);
+	void rotateLogs();
 private slots:
-	void handleSigHup();
 	void flushBuffer();
 signals:
 	void sigFlushBuffer();
 private:
 	bool logToConsole;
-	static int sigHupFD[2];
-	QSocketNotifier *snHup;
 	static QFile *logFile;
 	bool flushRunning;
 	QStringList buffer;

servatrice/src/serversocketinterface.cpp

@@ -289,6 +289,7 @@ Response::ResponseCode ServerSocketInterface::processExtendedAdminCommand(int cm
     switch ((AdminCommand::AdminCommandType) cmdType) {
         case AdminCommand::SHUTDOWN_SERVER: return cmdShutdownServer(cmd.GetExtension(Command_ShutdownServer::ext), rc);
         case AdminCommand::UPDATE_SERVER_MESSAGE: return cmdUpdateServerMessage(cmd.GetExtension(Command_UpdateServerMessage::ext), rc);
+        case AdminCommand::RELOAD_CONFIG: return cmdReloadConfig(cmd.GetExtension(Command_ReloadConfig::ext), rc);
         default: return Response::RespFunctionNotAllowed;
     }
 }
@@ -956,3 +957,9 @@ Response::ResponseCode ServerSocketInterface::cmdShutdownServer(const Command_Sh
     QMetaObject::invokeMethod(server, "scheduleShutdown", Q_ARG(QString, QString::fromStdString(cmd.reason())), Q_ARG(int, cmd.minutes()));
     return Response::RespOk;
 }
+
+Response::ResponseCode ServerSocketInterface::cmdReloadConfig(const Command_ReloadConfig &cmd, ResponseContainer & /*rc*/)
+{
+    settingsCache->sync();
+    return Response::RespOk;
+}

servatrice/src/serversocketinterface.h

@@ -47,6 +47,7 @@ class Command_ReplayDeleteMatch;
 class Command_BanFromServer;
 class Command_UpdateServerMessage;
 class Command_ShutdownServer;
+class Command_ReloadConfig;
 
 class ServerSocketInterface : public Server_ProtocolHandler
 {
@@ -94,6 +95,7 @@ private:
 	Response::ResponseCode cmdUpdateServerMessage(const Command_UpdateServerMessage &cmd, ResponseContainer &rc);
     Response::ResponseCode cmdRegisterAccount(const Command_Register &cmd, ResponseContainer &rc);
     Response::ResponseCode cmdActivateAccount(const Command_Activate &cmd, ResponseContainer & /* rc */);
+    Response::ResponseCode cmdReloadConfig(const Command_ReloadConfig &cmd, ResponseContainer & /*rc*/);
 	
 	Response::ResponseCode processExtendedSessionCommand(int cmdType, const SessionCommand &cmd, ResponseContainer &rc);
 	Response::ResponseCode processExtendedModeratorCommand(int cmdType, const ModeratorCommand &cmd, ResponseContainer &rc);

servatrice/src/signalhandler.cpp

@@ -0,0 +1,98 @@
+#include <QSocketNotifier>
+
+#include "signalhandler.h"
+#include "server_logger.h"
+#include "settingscache.h"
+#include "main.h"
+
+#ifdef Q_OS_UNIX
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <signal.h>
+#include <execinfo.h>
+#include <iostream>
+#include <cstdio>
+#endif
+
+#define SIGSEGV_TRACE_LINES 40
+
+int SignalHandler::sigHupFD[2];
+
+SignalHandler::SignalHandler(QObject *parent)
+: QObject(parent)
+{
+#ifdef Q_OS_UNIX
+    ::socketpair(AF_UNIX, SOCK_STREAM, 0, sigHupFD);
+
+    snHup = new QSocketNotifier(sigHupFD[1], QSocketNotifier::Read, this);
+    connect(snHup, SIGNAL(activated(int)), this, SLOT(internalSigHupHandler()));
+
+    struct sigaction hup;
+    hup.sa_handler = SignalHandler::sigHupHandler;
+    sigemptyset(&hup.sa_mask);
+    hup.sa_flags = 0;
+    hup.sa_flags |= SA_RESTART;
+    sigaction(SIGHUP, &hup, 0);
+    
+    struct sigaction segv;
+    segv.sa_handler = SignalHandler::sigSegvHandler;
+    segv.sa_flags = SA_RESETHAND;
+    sigemptyset(&segv.sa_mask);
+    sigaction(SIGSEGV, &segv, 0);
+    sigaction(SIGABRT, &segv, 0);
+    
+    signal(SIGPIPE, SIG_IGN);
+#endif
+}
+
+void SignalHandler::sigHupHandler(int /* sig */)
+{
+    char a = 1;
+    ssize_t writeValue = ::write(sigHupFD[0], &a, sizeof(a));
+    Q_UNUSED(writeValue);
+}
+
+void SignalHandler::internalSigHupHandler()
+{
+    snHup->setEnabled(false);
+    char tmp;
+    ssize_t readValue = ::read(sigHupFD[1], &tmp, sizeof(tmp));
+    Q_UNUSED(readValue);
+
+#ifdef Q_OS_UNIX
+    std::cerr << "Received SIGHUP" << std::endl;
+#endif
+    logger->logMessage("Received SIGHUP");
+    logger->rotateLogs();
+
+    settingsCache->sync();
+    
+    snHup->setEnabled(true);
+}
+
+void SignalHandler::sigSegvHandler(int sig)
+{
+#ifdef Q_OS_UNIX
+    void *array[SIGSEGV_TRACE_LINES];
+    size_t size;
+
+    // get void*'s for all entries on the stack
+    size = backtrace(array, SIGSEGV_TRACE_LINES);
+
+    // print out all the frames to stderr
+    fprintf(stderr, "Error: signal %d:\n", sig);
+    backtrace_symbols_fd(array, size, STDERR_FILENO);
+#endif
+    if (sig == SIGSEGV)
+        logger->logMessage("CRASH: SIGSEGV");
+    else if (sig == SIGABRT)
+        logger->logMessage("CRASH: SIGABRT");
+    
+    logger->deleteLater();
+    loggerThread->wait();
+    delete loggerThread;
+    
+    raise(sig);
+}
+

servatrice/src/signalhandler.h

@@ -0,0 +1,24 @@
+#ifndef SIGNALHANDLER_H
+#define SIGNALHANDLER_H
+
+#include <QObject>
+
+class QSocketNotifier;
+
+class SignalHandler: public QObject
+{
+	Q_OBJECT
+public:
+	SignalHandler(QObject *parent = 0);
+	~SignalHandler() { };
+	static void sigHupHandler(int /* sig */);
+	static void sigSegvHandler(int sig);
+private:
+	static int sigHupFD[2];
+	QSocketNotifier *snHup;
+private slots:
+	void internalSigHupHandler();
+
+};
+
+#endif