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vdr/videodir.c

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/*
* videodir.c: Functions to maintain a distributed video directory
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: videodir.c 2.1 2012/04/22 15:03:10 kls Exp $
*/
#include "videodir.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "recording.h"
#include "tools.h"
const char *VideoDirectory = VIDEODIR;
class cVideoDirectory {
private:
char *name, *stored, *adjusted;
int length, number, digits;
public:
cVideoDirectory(void);
~cVideoDirectory();
int FreeMB(int *UsedMB = NULL);
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const char *Name(void) { return name ? name : VideoDirectory; }
const char *Stored(void) { return stored; }
int Length(void) { return length; }
bool IsDistributed(void) { return name != NULL; }
bool Next(void);
void Store(void);
const char *Adjust(const char *FileName);
};
cVideoDirectory::cVideoDirectory(void)
{
length = strlen(VideoDirectory);
name = (VideoDirectory[length - 1] == '0') ? strdup(VideoDirectory) : NULL;
stored = adjusted = NULL;
number = -1;
digits = 0;
}
cVideoDirectory::~cVideoDirectory()
{
free(name);
free(stored);
free(adjusted);
}
int cVideoDirectory::FreeMB(int *UsedMB)
{
return FreeDiskSpaceMB(name ? name : VideoDirectory, UsedMB);
}
bool cVideoDirectory::Next(void)
{
if (name) {
if (number < 0) {
int l = length;
while (l-- > 0 && isdigit(name[l]))
;
l++;
digits = length - l;
int n = atoi(&name[l]);
if (n == 0)
number = n;
else
return false; // base video directory must end with zero
}
if (++number > 0) {
char buf[16];
if (sprintf(buf, "%0*d", digits, number) == digits) {
strcpy(&name[length - digits], buf);
return DirectoryOk(name);
}
}
}
return false;
}
void cVideoDirectory::Store(void)
{
if (name) {
free(stored);
stored = strdup(name);
}
}
const char *cVideoDirectory::Adjust(const char *FileName)
{
if (stored) {
free(adjusted);
adjusted = strdup(FileName);
return strncpy(adjusted, stored, length);
}
return NULL;
}
cUnbufferedFile *OpenVideoFile(const char *FileName, int Flags)
{
const char *ActualFileName = FileName;
// Incoming name must be in base video directory:
if (strstr(FileName, VideoDirectory) != FileName) {
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esyslog("ERROR: %s not in %s", FileName, VideoDirectory);
errno = ENOENT; // must set 'errno' - any ideas for a better value?
return NULL;
}
// Are we going to create a new file?
if ((Flags & O_CREAT) != 0) {
cVideoDirectory Dir;
if (Dir.IsDistributed()) {
// Find the directory with the most free space:
int MaxFree = Dir.FreeMB();
while (Dir.Next()) {
int Free = FreeDiskSpaceMB(Dir.Name());
if (Free > MaxFree) {
Dir.Store();
MaxFree = Free;
}
}
if (Dir.Stored()) {
ActualFileName = Dir.Adjust(FileName);
if (!MakeDirs(ActualFileName, false))
return NULL; // errno has been set by MakeDirs()
if (symlink(ActualFileName, FileName) < 0) {
LOG_ERROR_STR(FileName);
return NULL;
}
ActualFileName = strdup(ActualFileName); // must survive Dir!
}
}
}
cUnbufferedFile *File = cUnbufferedFile::Create(ActualFileName, Flags, DEFFILEMODE);
if (ActualFileName != FileName)
free((char *)ActualFileName);
return File;
}
int CloseVideoFile(cUnbufferedFile *File)
{
int Result = File->Close();
delete File;
return Result;
}
bool RenameVideoFile(const char *OldName, const char *NewName)
{
// Only the base video directory entry will be renamed, leaving the
// possible symlinks untouched. Going through all the symlinks and disks
// would be unnecessary work - maybe later...
if (rename(OldName, NewName) == -1) {
LOG_ERROR_STR(OldName);
return false;
}
return true;
}
bool RemoveVideoFile(const char *FileName)
{
return RemoveFileOrDir(FileName, true);
}
bool VideoFileSpaceAvailable(int SizeMB)
{
cVideoDirectory Dir;
if (Dir.IsDistributed()) {
if (Dir.FreeMB() >= SizeMB * 2) // base directory needs additional space
return true;
while (Dir.Next()) {
if (Dir.FreeMB() >= SizeMB)
return true;
}
return false;
}
return Dir.FreeMB() >= SizeMB;
}
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int VideoDiskSpace(int *FreeMB, int *UsedMB)
{
int free = 0, used = 0;
int deleted = DeletedRecordings.TotalFileSizeMB();
cVideoDirectory Dir;
do {
int u;
free += Dir.FreeMB(&u);
used += u;
} while (Dir.Next());
if (deleted > used)
deleted = used; // let's not get beyond 100%
free += deleted;
used -= deleted;
if (FreeMB)
*FreeMB = free;
if (UsedMB)
*UsedMB = used;
return (free + used) ? used * 100 / (free + used) : 0;
}
cString PrefixVideoFileName(const char *FileName, char Prefix)
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{
char PrefixedName[strlen(FileName) + 2];
const char *p = FileName + strlen(FileName); // p points at the terminating 0
int n = 2;
while (p-- > FileName && n > 0) {
if (*p == '/') {
if (--n == 0) {
int l = p - FileName + 1;
strncpy(PrefixedName, FileName, l);
PrefixedName[l] = Prefix;
strcpy(PrefixedName + l + 1, p + 1);
return PrefixedName;
}
}
}
return NULL;
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}
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void RemoveEmptyVideoDirectories(void)
{
cVideoDirectory Dir;
do {
RemoveEmptyDirectories(Dir.Name());
} while (Dir.Next());
}
bool IsOnVideoDirectoryFileSystem(const char *FileName)
{
cVideoDirectory Dir;
do {
if (EntriesOnSameFileSystem(Dir.Name(), FileName))
return true;
} while (Dir.Next());
return false;
}
// --- cVideoDiskUsage -------------------------------------------------------
#define DISKSPACECHEK 5 // seconds between disk space checks
#define MB_PER_MINUTE 25.75 // this is just an estimate!
int cVideoDiskUsage::state = 0;
time_t cVideoDiskUsage::lastChecked = 0;
int cVideoDiskUsage::usedPercent = 0;
int cVideoDiskUsage::freeMB = 0;
int cVideoDiskUsage::freeMinutes = 0;
bool cVideoDiskUsage::HasChanged(int &State)
{
if (time(NULL) - lastChecked > DISKSPACECHEK) {
int FreeMB;
int UsedPercent = VideoDiskSpace(&FreeMB);
if (FreeMB != freeMB) {
usedPercent = UsedPercent;
freeMB = FreeMB;
int MBperMinute = Recordings.MBperMinute();
if (MBperMinute <= 0)
MBperMinute = MB_PER_MINUTE;
freeMinutes = int(double(FreeMB) / MBperMinute);
state++;
}
lastChecked = time(NULL);
}
if (State != state) {
State = state;
return true;
}
return false;
}
cString cVideoDiskUsage::String(void)
{
HasChanged(state);
return cString::sprintf("%s %d%% - %2d:%02d %s", tr("Disk"), usedPercent, freeMinutes / 60, freeMinutes % 60, tr("free"));
}