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-rw-r--r--ftparchive/cachedb.h195
1 files changed, 195 insertions, 0 deletions
diff --git a/ftparchive/cachedb.h b/ftparchive/cachedb.h
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ CacheDB
+
+ Simple uniform interface to a cache database.
+
+ ##################################################################### */
+ /*}}}*/
+#ifndef CACHEDB_H
+#define CACHEDB_H
+
+#include <apt-pkg/debfile.h>
+#include <apt-pkg/hashes.h>
+
+#include <db.h>
+#include <string>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "contents.h"
+#include "sources.h"
+
+class FileFd;
+
+
+class CacheDB
+{
+ protected:
+
+ // Database state/access
+ DBT Key;
+ DBT Data;
+ char TmpKey[600];
+ DB *Dbp;
+ bool DBLoaded;
+ bool ReadOnly;
+ std::string DBFile;
+
+ // Generate a key for the DB of a given type
+ 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",FileName.c_str(), Type);
+ }
+
+ void InitQueryStats() {
+ _InitQuery("st");
+ }
+ void InitQuerySource() {
+ _InitQuery("cs");
+ }
+ void InitQueryControl() {
+ _InitQuery("cl");
+ }
+ void InitQueryContent() {
+ _InitQuery("cn");
+ }
+
+ inline bool Get()
+ {
+ return Dbp->get(Dbp,0,&Key,&Data,0) == 0;
+ };
+ inline bool Put(const void *In,unsigned long const &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;
+ }
+ bool OpenFile();
+ void CloseFile();
+
+ bool OpenDebFile();
+ void CloseDebFile();
+
+ // GetCurStat needs some compat code, see lp #1274466)
+ bool GetCurStatCompatOldFormat();
+ bool GetCurStatCompatNewFormat();
+ bool GetCurStat();
+
+ bool GetFileStat(bool const &doStat = false);
+ bool LoadControl();
+ bool LoadContents(bool const &GenOnly);
+ bool LoadSource();
+ bool GetHashes(bool const GenOnly, unsigned int const DoHashes);
+
+ // 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),
+ FlSize=(1<<3), FlSHA1=(1<<4), FlSHA256=(1<<5),
+ FlSHA512=(1<<6), FlSource=(1<<7)
+ };
+
+ // the on-disk format changed (FileSize increased to 64bit) in
+ // commit 650faab0 which will lead to corruption with old caches
+ struct StatStoreOldFormat
+ {
+ uint32_t Flags;
+ uint32_t mtime;
+ uint32_t FileSize;
+ uint8_t MD5[16];
+ uint8_t SHA1[20];
+ uint8_t SHA256[32];
+ } CurStatOldFormat;
+
+ // WARNING: this struct is read/written to the DB so do not change the
+ // layout of the fields (see lp #1274466), only append to it
+ struct StatStore
+ {
+ uint32_t Flags;
+ uint32_t mtime;
+ uint64_t FileSize;
+ uint8_t MD5[16];
+ uint8_t SHA1[20];
+ uint8_t SHA256[32];
+ uint8_t SHA512[64];
+ } CurStat;
+ struct StatStore OldStat;
+
+ // 'set' state
+ std::string FileName;
+ FileFd *Fd;
+ debDebFile *DebFile;
+
+ public:
+
+ // Data collection helpers
+ debDebFile::MemControlExtract Control;
+ ContentsExtract Contents;
+ DscExtract Dsc;
+ HashStringList HashesList;
+
+ // Runtime statistics
+ struct Stats
+ {
+ double Bytes;
+ double MD5Bytes;
+ double SHA1Bytes;
+ double SHA256Bytes;
+ double SHA512Bytes;
+ unsigned long Packages;
+ unsigned long Misses;
+ unsigned long long DeLinkBytes;
+
+ inline void Add(const Stats &S) {
+ Bytes += S.Bytes;
+ MD5Bytes += S.MD5Bytes;
+ SHA1Bytes += S.SHA1Bytes;
+ SHA256Bytes += S.SHA256Bytes;
+ SHA512Bytes += S.SHA512Bytes;
+ Packages += S.Packages;
+ Misses += S.Misses;
+ DeLinkBytes += S.DeLinkBytes;
+ };
+ Stats() : Bytes(0), MD5Bytes(0), SHA1Bytes(0), SHA256Bytes(0),
+ SHA512Bytes(0),Packages(0), Misses(0), DeLinkBytes(0) {};
+ } Stats;
+
+ bool ReadyDB(std::string const &DB = "");
+ inline bool DBFailed() {return Dbp != 0 && DBLoaded == false;};
+ inline bool Loaded() {return DBLoaded == true;};
+
+ inline unsigned long long GetFileSize(void) {return CurStat.FileSize;}
+
+ bool SetFile(std::string const &FileName,struct stat St,FileFd *Fd);
+
+ // terrible old overloaded interface
+ bool GetFileInfo(std::string const &FileName,
+ bool const &DoControl,
+ bool const &DoContents,
+ bool const &GenContentsOnly,
+ bool const DoSource,
+ unsigned int const DoHashes,
+ bool const &checkMtime = false);
+
+ bool Finish();
+
+ bool Clean();
+
+ explicit CacheDB(std::string const &DB);
+ ~CacheDB();
+};
+
+#endif