visualizer/src/module/Module.cpp

   1 #include <sys/stat.h>
   2 #include <dlfcn.h>
   3
   4 #include <QSettings>
   5
   6 #include "Module.h"
   7
   8 Module::Module(const char *name) : m_name(name), m_moduleHandle(NULL){
   9         QString path = modulePath(QString("lib").append(name).append("Visualizer.so"));
  10         if(path.length() == 0) return;
  11         m_moduleHandle = dlopen(path.toAscii().constData(), RTLD_LAZY | RTLD_LOCAL);
  12         if(m_moduleHandle == NULL) {
  13                 qWarning("Cannot load module \"%s\". Error: %s", name, dlerror());
  14                 qWarning("Last path is %s.", path.toAscii().constData());
  15                 return;
  16         }
  17
  18         void *instantiationHandle = dlsym(m_moduleHandle, "AesalonVisualizerCreateInstance");
  19
  20         if(instantiationHandle == NULL) {
  21                 qWarning("Module \"%s\" does not have instantiation function.", name);
  22                 return;
  23         }
  24
  25         ModuleInterface *(*instantiateFunction)();
  26         *(void **)(&instantiateFunction) = instantiationHandle;
  27
  28         m_interface = instantiateFunction();
  29
  30         if(m_interface == NULL) {
  31                 qWarning("Module \"%s\" failed to create ModuleInterface instance.", name);
  32                 return;
  33         }
  34 }
  35
  36 Module::~Module() {
  37
  38 }
  39
  40 void Module::processIncoming(DataPacket *packet) {
  41         if(m_interface == NULL) return;
  42         m_interface->processIncoming(packet);
  43 }
  44
  45 QString Module::modulePath(QString filename) {
  46         QSettings settings;
  47         QString pathList = settings.value("module-path", "modules/build/").toString();
  48         if(filename.length() == 0 || pathList.length() == 0) return "";
  49
  50         do {
  51                 QString path = pathList.left(pathList.indexOf(":"));
  52
  53                 QString filePath = path;
  54                 filePath += "/";
  55                 filePath += filename;
  56
  57                 struct stat possibleStat;
  58                 if(stat(filePath.toAscii().constData(), &possibleStat) == 0) return filePath;
  59
  60                 pathList.remove(0, path.length()+1);
  61         } while(pathList.contains(":"));
  62
  63         return "";
  64 }