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filemonitor.cpp
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filemonitor.cpp
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/** ***************************************************************************
* Description : Class for a single teletext line
* Compiler : C++
*
* Copyright (C) 2014, Peter Kwan
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that the copyright notice and this
* permission notice and warranty disclaimer appear in supporting
* documentation, and that the name of the author not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* The author disclaims all warranties with regard to this
* software, including all implied warranties of merchantability
* and fitness. In no event shall the author be liable for any
* special, indirect or consequential damages or any damages
* whatsoever resulting from loss of use, data or profits, whether
* in an action of contract, negligence or other tortious action,
* arising out of or in connection with the use or performance of
* this software.
*************************************************************************** **/
#include "filemonitor.h"
using namespace vbit;
using namespace ttx;
FileMonitor::FileMonitor(Configure *configure, PageList *pageList) :
_configure(configure),_pageList(pageList)
{
//ctor
}
FileMonitor::FileMonitor()
: _pageList(nullptr)
{
//ctor
}
FileMonitor::~FileMonitor()
{
//dtor
}
/**
std::thread FileMonitor::run()
{
t=new std::thread(&FileMonitor::worker, this); // Start the thread
//t.join(); // Rejoin after the thread terminates
return false;
}
*/
void FileMonitor::run()
{
// @todo This thread will clash. They need proper protection.
std::string path=_configure->GetPageDirectory() ; //
std::cerr << "[FileMonitor::run] Monitoring " << path << std::endl;
while (true)
{
DIR *dp;
struct dirent *dirp;
// Open the directory
if ( (dp = opendir(path.c_str())) == NULL)
{
std::cerr << "Error(" << errno << ") opening " << path << std::endl;
return;
}
_pageList->ClearFlags(); // Assume that no files exist
// Load the filenames into a list
while ((dirp = readdir(dp)) != NULL)
{
// Select only pages that might be teletext. tti or ttix at the moment.
// strcasestr doesn't seem to be in my Windows compiler.
#ifdef _WIN32
char* p=strstr(dirp->d_name,".tti");
#else
char* p=strcasestr(dirp->d_name,".tti");
#endif
// std::cerr << path << "/" << dirp->d_name << std::endl;
if (p)
{
std::string name;
name=path;
name+="/";
name+=dirp->d_name;
// Find the modification time
struct stat attrib; // create a file attribute structure
stat(name.c_str(), &attrib); // get the attributes of the file
// struct tm* clock = gmtime(&(attrib.st_mtime)); // Get the last modified time and put it into the time structure
// std::cerr << path << "/" << dirp->d_name << std::dec << " time:" << std::setw(2) << clock->tm_hour << ":" << std::setw(2) << clock->tm_min << std::endl;
// Now we want to process changes
// 1) Is it a new page? Then add it.
TTXPageStream* q=_pageList->Locate(name);
if (q) // File was found
{
if (!(q->GetStatusFlag()==TTXPageStream::MARKED || q->GetStatusFlag()==TTXPageStream::GONE)) // file is not mid-deletion
{
//std::cerr << dirp->d_name << " was found" << std::endl;
if (attrib.st_mtime!=q->GetModifiedTime()) // File exists. Has it changed?
{
//std::cerr << "[FileMonitor::run] File has been modified " << dirp->d_name << std::endl;
// We just load the new page and update the modified time
// This isn't good enough.
// We need a mutex or semaphore to lock out this page while we do that
// lock
q->LoadPage(name); // What if this fails? We can see the bool. What to do ?
q->IncrementUpdateCount();
q->SetFileChangedFlag();
q->GetPageCount(); // renumber the subpages
int mag=(q->GetPageNumber() >> 16) & 0x7;
if ((!(q->GetSpecialFlag())) && (q->Special()))
{
// page was not 'special' but now is, add to SpecialPages list
q->SetSpecialFlag(true);
_pageList->GetMagazines()[mag]->GetSpecialPages()->addPage(q);
std::cerr << "[FileMonitor::run] page was normal, is now special " << std::hex << q->GetPageNumber() << std::endl;
// page will be removed from NormalPages list by the service thread
// page will be removed from Carousel list by the service thread
}
else if ((q->GetSpecialFlag()) && (!(q->Special())))
{
// page was 'special' but now isn't, add to NormalPages list
_pageList->GetMagazines()[mag]->GetNormalPages()->addPage(q);
std::cerr << "[FileMonitor::run] page was special, is now normal " << std::hex << q->GetPageNumber() << std::endl;
_pageList->GetMagazines()[mag]->GetNormalPages()->sortPages(); // TODO: add pages in correct place in list
}
if ((!(q->Special())) && (!(q->GetCarouselFlag())) && q->IsCarousel())
{
// 'normal' page was not 'carousel' but now is, add to Carousel list
q->SetCarouselFlag(true);
q->StepNextSubpage(); // ensure we're pointing at a subpage
_pageList->GetMagazines()[mag]->GetCarousel()->addPage(q);
std::cerr << "[FileMonitor::run] page is now a carousel " << std::hex << q->GetPageNumber() << std::endl;
}
if (_pageList->CheckForPacket29(q))
{
std::cerr << "[FileMonitor::run] found packet 29" << std::endl;
_pageList->GetMagazines()[mag]->SetPacket29(_pageList->GetPacket29(mag));
}
q->SetModifiedTime(attrib.st_mtime);
// unlock
}
q->SetState(TTXPageStream::FOUND); // Mark this page as existing on the drive
}
}
else
{
std::cerr << "[FileMonitor::run] Adding a new page " << dirp->d_name << std::endl;
// A new file. Create the page object and add it to the page list.
if ((q=new TTXPageStream(name)))
{
_pageList->AddPage(q);
if((q=_pageList->Locate(name))) // get pointer to copy in list
{
q->GetPageCount(); // renumber the subpages
int mag=(q->GetPageNumber() >> 16) & 0x7;
if (q->Special())
{
// Page is 'special'
q->SetSpecialFlag(true);
q->SetCarouselFlag(false);
_pageList->GetMagazines()[mag]->GetSpecialPages()->addPage(q);
//std::cerr << "[FileMonitor::run] new page is special " << std::hex << q->GetPageNumber() << std::endl;
}
else
{
// Page is 'normal'
q->SetSpecialFlag(false);
_pageList->GetMagazines()[mag]->GetNormalPages()->addPage(q);
//std::cerr << "[FileMonitor::run] new page is normal " << std::hex << q->GetPageNumber() << std::endl;
_pageList->GetMagazines()[mag]->GetNormalPages()->sortPages();
if (q->IsCarousel())
{
// Page is also a 'carousel'
q->SetCarouselFlag(true);
q->StepNextSubpage(); // ensure we're pointing at a subpage
_pageList->GetMagazines()[mag]->GetCarousel()->addPage(q);
//std::cerr << "[FileMonitor::run] new page is a carousel " << std::hex << q->GetPageNumber() << std::endl;
}
else
q->SetCarouselFlag(false);
}
if (_pageList->CheckForPacket29(q))
{
std::cerr << "[FileMonitor::run] found packet 29" << std::endl;
_pageList->GetMagazines()[mag]->SetPacket29(_pageList->GetPacket29(mag));
}
}
else
std::cerr << "[FileMonitor::run] Failed to add" << dirp->d_name << std::endl; // should never happen
}
else
std::cerr << "[FileMonitor::run] Failed to load" << dirp->d_name << std::endl;
}
}
}
closedir(dp);
// std::cerr << "[FileMonitor::run] Finished scan" << std::endl;
// Delete pages that no longer exist (this blocks the thread until the pages are removed)
_pageList->DeleteOldPages();
// Wait 5 seconds to avoid hogging cpu
// Sounds like a job for a mutex.
struct timespec rec;
int ms;
ms=5000;
rec.tv_sec = ms / 1000;
rec.tv_nsec=(ms % 1000) *1000000;
nanosleep(&rec,nullptr);
}
} // run