Add systemd logging to core library

libssu/libssu.pro

@@ -4,10 +4,11 @@ HEADERS = ssu.h \
 SOURCES = ssu.cpp
 TEMPLATE = lib
 TARGET = ssu
-CONFIG += dll mobility
+CONFIG += dll mobility link_pkgconfig
 QT -= gui
 QT += network xml
 MOBILITY += systeminfo
+PKGCONFIG += libsystemd-journal
 
 headers.files = ssu.h
 headers.path  = /usr/include

libssu/ssu.cpp

@@ -8,13 +8,15 @@
 #include <QSystemDeviceInfo>
 
 #include <QtXml/QDomDocument>
+
 #include "ssu.h"
 #include "../constants.h"
 
 QTM_USE_NAMESPACE
 
-Ssu::Ssu(): QObject(){
+Ssu::Ssu(QString fallbackLog): QObject(){
   errorFlag = false;
+  fallbackLogPath = fallbackLog;
 
 #ifdef SSUCONFHACK
   // dirty hack to make sure we can write to the configuration
@@ -289,6 +291,21 @@ QString Ssu::lastError(){
   return errorString;
 }
 
+void Ssu::printJournal(int priority, QString message){
+  QByteArray ba = message.toUtf8();
+  const char *ca = ba.constData();
+
+  if (sd_journal_print(LOG_INFO, "ssu: %s", ca) < 0 && fallbackLogPath != ""){
+    QFile logfile;
+    QTextStream logstream;
+    logfile.setFileName(fallbackLogPath);
+    logfile.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append);
+    logstream.setDevice(&logfile);
+    logstream << message << "\n";
+    logstream.flush();
+  }
+}
+
 bool Ssu::registerDevice(QDomDocument *response){
   QString certificateString = response->elementsByTagName("certificate").at(0).toElement().text();
   QSslCertificate certificate(certificateString.toAscii());

libssu/ssu.h

@@ -16,11 +16,13 @@
 
 #include <QtXml/QDomDocument>
 
+#include <systemd/sd-journal.h>
+
 class Ssu: public QObject {
     Q_OBJECT
 
   public:
-    Ssu();
+    Ssu(QString fallbackLog="");
     /**
      * Find a username/password pair for the given scope
      * @return a QPair with username and password, or an empty QPair if scope is invalid
@@ -86,6 +88,10 @@ class Ssu: public QObject {
      * successful.
      */
     Q_INVOKABLE QString lastError();
+    /**
+     * Print a message to systemds journal, or to a text log file, if a fallback is defined
+     */
+    void printJournal(int priority, QString message);
     /**
      * Return the release version string for either a release, or a RnD snapshot
      */
@@ -122,7 +128,7 @@ class Ssu: public QObject {
     Q_INVOKABLE bool useSslVerify();
 
   private:
-    QString errorString;
+    QString errorString, fallbackLogPath;
     QString cachedModel, cachedFamily;
     bool errorFlag;
     QNetworkAccessManager *manager;