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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: cachedb.h,v 1.4 2004/05/08 19:41:01 mdz Exp $
/* ######################################################################
CacheDB
Simple uniform interface to a cache database.
##################################################################### */
/*}}}*/
#ifndef CACHEDB_H
#define CACHEDB_H
#ifdef __GNUG__
#pragma interface "cachedb.h"
#endif
#include <db.h>
#include <string>
#include <apt-pkg/debfile.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <errno.h>
#include "contents.h"
class CacheDB
{
protected:
// Database state/access
DBT Key;
DBT Data;
char TmpKey[600];
DB *Dbp;
bool DBLoaded;
bool ReadOnly;
string DBFile;
// Generate a key for the DB of a given type
inline void InitQuery(const char *Type)
{
memset(&Key,0,sizeof(Key));
memset(&Data,0,sizeof(Data));
Key.data = TmpKey;
Key.size = snprintf(TmpKey,sizeof(TmpKey),"%s:%s",Type,FileName.c_str());
}
inline bool Get()
{
return Dbp->get(Dbp,0,&Key,&Data,0) == 0;
};
inline bool Put(const void *In,unsigned long Length)
{
if (ReadOnly == true)
return true;
Data.size = Length;
Data.data = (void *)In;
if (DBLoaded == true && (errno = Dbp->put(Dbp,0,&Key,&Data,0)) != 0)
{
DBLoaded = false;
return false;
}
return true;
}
// Stat info stored in the DB, Fixed types since it is written to disk.
enum FlagList {FlControl = (1<<0),FlMD5=(1<<1),FlContents=(1<<2)};
struct StatStore
{
uint32_t mtime;
uint32_t Flags;
} CurStat;
struct StatStore OldStat;
// 'set' state
string FileName;
struct stat FileStat;
FileFd *Fd;
debDebFile *DebFile;
public:
// Data collection helpers
debDebFile::MemControlExtract Control;
ContentsExtract Contents;
// Runtime statistics
struct Stats
{
double Bytes;
double MD5Bytes;
unsigned long Packages;
unsigned long Misses;
unsigned long DeLinkBytes;
inline void Add(const Stats &S) {Bytes += S.Bytes; MD5Bytes += S.MD5Bytes;
Packages += S.Packages; Misses += S.Misses; DeLinkBytes += S.DeLinkBytes;};
Stats() : Bytes(0), MD5Bytes(0), Packages(0), Misses(0), DeLinkBytes(0) {};
} Stats;
bool ReadyDB(string DB);
inline bool DBFailed() {return Dbp != 0 && DBLoaded == false;};
inline bool Loaded() {return DBLoaded == true;};
bool SetFile(string FileName,struct stat St,FileFd *Fd);
bool LoadControl();
bool LoadContents(bool GenOnly);
bool GetMD5(string &MD5Res,bool GenOnly);
bool Finish();
bool Clean();
CacheDB(string DB) : Dbp(0), DebFile(0) {ReadyDB(DB);};
~CacheDB() {ReadyDB(string()); delete DebFile;};
};
#endif
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