#ifndef lint
static char rcsid[] = "@(#$Id: rcldb.cpp,v 1.122 2007-07-12 17:28:11 dockes Exp $ (C) 2004 J.F.Dockes";
#endif
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fnmatch.h>
#include <regex.h>
#include <math.h>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#ifndef NO_NAMESPACES
using namespace std;
#endif /* NO_NAMESPACES */
#include "rclconfig.h"
#include "rcldb.h"
#include "stemdb.h"
#include "textsplit.h"
#include "transcode.h"
#include "unacpp.h"
#include "conftree.h"
#include "debuglog.h"
#include "pathut.h"
#include "smallut.h"
#include "pathhash.h"
#include "utf8iter.h"
#include "searchdata.h"
#include "xapian.h"
#ifndef MAX
#define MAX(A,B) (A>B?A:B)
#endif
#ifndef MIN
#define MIN(A,B) (A<B?A:B)
#endif
// This is the word position offset at which we index the body text
// (abstract, keywords, etc.. are stored before this)
static const unsigned int baseTextPosition = 100000;
#undef MTIME_IN_VALUE
#ifdef MTIME_IN_VALUE
// Omega compatible values
#define enum value_slot {
VALUE_LASTMOD = 0, // 4 byte big endian value - seconds since 1970.
VALUE_MD5 = 1 // 16 byte MD5 checksum of original document.
};
#endif
#ifndef NO_NAMESPACES
namespace Rcl {
#endif
// Max length for path terms stored for each document. Truncate
// longer path and uniquize with hash. The goal for this is to avoid
// xapian max term length limitations, not to gain space (we gain very
// little even with very short maxlens like 30)
// Note that Q terms add the ipath to this, and that the xapian max
// key length seems to be around 250
// The value for PATHHASHLEN includes the length of the hash part.
#define PATHHASHLEN 150
// Synthetic abstract marker (to discriminate from abstract actually
// found in doc)
const static string rclSyntAbs = "?!#@";
const static string emptystring;
// A class for data and methods that would have to expose
// Xapian-specific stuff if they were in Rcl::Db. There could actually be
// 2 different ones for indexing or query as there is not much in
// common.
class Native {
public:
Db *m_db;
bool m_isopen;
bool m_iswritable;
// Indexing
Xapian::WritableDatabase wdb;
// Querying
Xapian::Database db;
Xapian::Query query; // query descriptor: terms and subqueries
// joined by operators (or/and etc...)
Xapian::Enquire *enquire; // Open query descriptor.
Xapian::MSet mset; // Partial result set
// Term frequencies for current query. See makeAbstract, setQuery
map<string, double> m_termfreqs;
Native(Db *db)
: m_db(db),
m_isopen(false), m_iswritable(false), enquire(0)
{ }
~Native() {
delete enquire;
}
string makeAbstract(Xapian::docid id, const list<string>& terms);
bool dbDataToRclDoc(Xapian::docid docid, std::string &data, Doc &doc);
/** Compute list of subdocuments for a given path (given by hash)
* We look for all Q terms beginning with the path/hash
* As suggested by James Aylett, a better method would be to add
* a single term (ie: XP/path/to/file) to all subdocs, then finding
* them would be a simple matter of retrieving the posting list for the
* term. There would still be a need for the current Qterm though, as a
* unique term for replace_document, and for retrieving by
* path/ipath (history)
*/
bool subDocs(const string &hash, vector<Xapian::docid>& docids);
/** Keep this inline */
bool filterMatch(Db *rdb, Xapian::Document &xdoc) {
// Parse xapian document's data and populate doc fields
string data = xdoc.get_data();
ConfSimple parms(&data);
// The only filtering for now is on file path (subtree)
string url;
parms.get(string("url"), url);
url = url.substr(7);
LOGDEB2(("Rcl::Db::Native:filter filter [%s] fn [%s]\n",
rdb->m_filterTopDir.c_str(), url.c_str()));
if (url.find(rdb->m_filterTopDir) == 0)
return true;
return false;
}
};
/* See comment in class declaration */
bool Native::subDocs(const string &hash, vector<Xapian::docid>& docids)
{
docids.clear();
string qterm = "Q"+ hash + "|";
string ermsg;
for (int tries = 0; tries < 2; tries++) {
try {
Xapian::TermIterator it = db.allterms_begin();
it.skip_to(qterm);
for (;it != db.allterms_end(); it++) {
// If current term does not begin with qterm or has
// another |, not the same file
if ((*it).find(qterm) != 0 ||
(*it).find_last_of("|") != qterm.length() -1)
break;
docids.push_back(*(db.postlist_begin(*it)));
}
return true;
} catch (const Xapian::DatabaseModifiedError &e) {
LOGDEB(("Db::subDocs: got modified error. reopen/retry\n"));
// Can't use reOpen here, it would delete *me*
db = Xapian::Database(m_db->m_basedir);
} catch (const Xapian::Error &e) {
ermsg = e.get_msg().c_str();
break;
} catch (...) {
ermsg= "Unknown error";
break;
}
}
LOGERR(("Rcl::Db::subDocs: %s\n", ermsg.c_str()));
return false;
}
// Turn data record from db into document fields
bool Native::dbDataToRclDoc(Xapian::docid docid, std::string &data, Doc &doc)
{
LOGDEB1(("Db::dbDataToRclDoc: data: %s\n", data.c_str()));
ConfSimple parms(&data);
if (!parms.ok())
return false;
parms.get(string("url"), doc.url);
parms.get(string("mtype"), doc.mimetype);
parms.get(string("fmtime"), doc.fmtime);
parms.get(string("dmtime"), doc.dmtime);
parms.get(string("origcharset"), doc.origcharset);
parms.get(string("caption"), doc.meta["title"]);
parms.get(string("keywords"), doc.meta["keywords"]);
parms.get(string("abstract"), doc.meta["abstract"]);
// Possibly remove synthetic abstract indicator (if it's there, we
// used to index the beginning of the text as abstract).
doc.syntabs = false;
if (doc.meta["abstract"].find(rclSyntAbs) == 0) {
doc.meta["abstract"] = doc.meta["abstract"].substr(rclSyntAbs.length());
doc.syntabs = true;
}
parms.get(string("ipath"), doc.ipath);
parms.get(string("fbytes"), doc.fbytes);
parms.get(string("dbytes"), doc.dbytes);
doc.xdocid = docid;
return true;
}
static list<string> noPrefixList(const list<string>& in)
{
list<string> out;
for (list<string>::const_iterator qit = in.begin();
qit != in.end(); qit++) {
if ('A' <= qit->at(0) && qit->at(0) <= 'Z') {
string term = *qit;
while (term.length() && 'A' <= term.at(0) && term.at(0) <= 'Z')
term.erase(0, 1);
if (term.length())
out.push_back(term);
continue;
} else {
out.push_back(*qit);
}
}
return out;
}
//#define DEBUGABSTRACT
#ifdef DEBUGABSTRACT
#define LOGABS LOGDEB
#else
#define LOGABS LOGDEB2
#endif
// Build a document abstract by extracting text chunks around the query terms
// This uses the db termlists, not the original document.
string Native::makeAbstract(Xapian::docid docid, const list<string>& iterms)
{
Chrono chron;
LOGDEB(("makeAbstract:%d: maxlen %d wWidth %d\n", chron.ms(),
m_db->m_synthAbsLen, m_db->m_synthAbsWordCtxLen));
list<string> terms = noPrefixList(iterms);
if (terms.empty()) {
return "";
}
// Retrieve db-wide frequencies for the query terms
if (m_termfreqs.empty()) {
double doccnt = db.get_doccount();
if (doccnt == 0) doccnt = 1;
for (list<string>::const_iterator qit = terms.begin();
qit != terms.end(); qit++) {
m_termfreqs[*qit] = db.get_termfreq(*qit) / doccnt;
LOGABS(("makeAbstract: [%s] db freq %.1e\n", qit->c_str(),
m_termfreqs[*qit]));
}
LOGABS(("makeAbstract:%d: got termfreqs\n", chron.ms()));
}
// Compute a term quality coefficient by retrieving the term
// Within Document Frequencies and multiplying by overal term
// frequency, then using log-based thresholds. We are going to try
// and show text around the less common search terms.
map<string, double> termQcoefs;
double totalweight = 0;
double doclen = db.get_doclength(docid);
if (doclen == 0) doclen = 1;
for (list<string>::const_iterator qit = terms.begin();
qit != terms.end(); qit++) {
Xapian::TermIterator term = db.termlist_begin(docid);
term.skip_to(*qit);
if (term != db.termlist_end(docid) && *term == *qit) {
double q = (term.get_wdf() / doclen) * m_termfreqs[*qit];
q = -log10(q);
if (q < 3) {
q = 0.05;
} else if (q < 4) {
q = 0.3;
} else if (q < 5) {
q = 0.7;
} else if (q < 6) {
q = 0.8;
} else {
q = 1;
}
termQcoefs[*qit] = q;
totalweight += q;
}
}
LOGABS(("makeAbstract:%d: computed Qcoefs.\n", chron.ms()));
// Build a sorted by quality term list.
multimap<double, string> byQ;
for (list<string>::const_iterator qit = terms.begin();
qit != terms.end(); qit++) {
if (termQcoefs.find(*qit) != termQcoefs.end())
byQ.insert(pair<double,string>(termQcoefs[*qit], *qit));
}
#ifdef DEBUGABSTRACT
for (multimap<double, string>::reverse_iterator qit = byQ.rbegin();
qit != byQ.rend(); qit++) {
LOGDEB(("%.1e->[%s]\n", qit->first, qit->second.c_str()));
}
#endif
// For each of the query terms, ask xapian for its positions list
// in the document. For each position entry, remember it in
// qtermposs and insert it and its neighbours in the set of
// 'interesting' positions
// The terms 'array' that we partially populate with the document
// terms, at their positions around the search terms positions:
map<unsigned int, string> sparseDoc;
// All the chosen query term positions.
vector<unsigned int> qtermposs;
// Limit the total number of slots we populate. The 7 is taken as
// average word size. It was a mistake to have the user max
// abstract size parameter in characters, we basically only deal
// with words. We used to limit the character size at the end, but
// this damaged our careful selection of terms
const unsigned int maxtotaloccs =
m_db->m_synthAbsLen /(7 * (m_db->m_synthAbsWordCtxLen+1));
LOGABS(("makeAbstract:%d: mxttloccs %d\n", chron.ms(), maxtotaloccs));
// This can't happen, but would crash us
if (totalweight == 0.0) {
LOGERR(("makeAbstract: 0 totalweight!\n"));
return "";
}
// Let's go populate
for (multimap<double, string>::reverse_iterator qit = byQ.rbegin();
qit != byQ.rend(); qit++) {
string qterm = qit->second;
unsigned int maxoccs;
if (byQ.size() == 1) {
maxoccs = maxtotaloccs;
} else {
// We give more slots to the better terms
float q = qit->first / totalweight;
maxoccs = int(ceil(maxtotaloccs * q));
LOGABS(("makeAbstract: [%s] %d max occs (coef %.2f)\n",
qterm.c_str(), maxoccs, q));
}
Xapian::PositionIterator pos;
// There may be query terms not in this doc. This raises an
// exception when requesting the position list, we catch it.
string emptys;
try {
unsigned int occurrences = 0;
for (pos = db.positionlist_begin(docid, qterm);
pos != db.positionlist_end(docid, qterm); pos++) {
unsigned int ipos = *pos;
if (ipos < baseTextPosition) // Not in text body
continue;
LOGABS(("makeAbstract: [%s] at %d occurrences %d maxoccs %d\n",
qterm.c_str(), ipos, occurrences, maxoccs));
// Remember the term position
qtermposs.push_back(ipos);
// Add adjacent slots to the set to populate at next step
unsigned int sta = MAX(0, ipos-m_db->m_synthAbsWordCtxLen);
unsigned int sto = ipos+m_db->m_synthAbsWordCtxLen;
for (unsigned int ii = sta; ii <= sto; ii++) {
if (ii == ipos)
sparseDoc[ii] = qterm;
else
sparseDoc[ii] = emptys;
}
// Limit to allocated occurences and total size
if (++occurrences >= maxoccs ||
qtermposs.size() >= maxtotaloccs)
break;
}
} catch (...) {
// Term does not occur. No problem.
}
if (qtermposs.size() >= maxtotaloccs)
break;
}
LOGABS(("makeAbstract:%d:chosen number of positions %d\n",
chron.millis(), qtermposs.size()));
// This can happen if there are term occurences in the keywords
// etc. but not elsewhere ?
if (qtermposs.size() == 0)
return "";
// Walk all document's terms position lists and populate slots
// around the query terms. We arbitrarily truncate the list to
// avoid taking forever. If we do cutoff, the abstract may be
// inconsistant (missing words, potentially altering meaning),
// which is bad...
{
Xapian::TermIterator term;
int cutoff = 500 * 1000;
for (term = db.termlist_begin(docid);
term != db.termlist_end(docid); term++) {
// Ignore prefixed terms
if ('A' <= (*term).at(0) && (*term).at(0) <= 'Z')
continue;
if (cutoff-- < 0) {
LOGDEB(("makeAbstract: max term count cutoff\n"));
break;
}
Xapian::PositionIterator pos;
for (pos = db.positionlist_begin(docid, *term);
pos != db.positionlist_end(docid, *term); pos++) {
if (cutoff-- < 0) {
LOGDEB(("makeAbstract: max term count cutoff\n"));
break;
}
map<unsigned int, string>::iterator vit;
if ((vit=sparseDoc.find(*pos)) != sparseDoc.end()) {
// Don't replace a term: the terms list is in
// alphabetic order, and we may have several terms
// at the same position, we want to keep only the
// first one (ie: dockes and dockes@wanadoo.fr)
if (vit->second.empty()) {
LOGABS(("makeAbstract: populating: [%s] at %d\n",
(*term).c_str(), *pos));
sparseDoc[*pos] = *term;
}
}
}
}
}
#if 0
// Debug only: output the full term[position] vector
bool epty = false;
int ipos = 0;
for (map<unsigned int, string>::iterator it = sparseDoc.begin();
it != sparseDoc.end();
it++, ipos++) {
if (it->empty()) {
if (!epty)
LOGDEB(("makeAbstract:vec[%d]: [%s]\n", ipos, it->c_str()));
epty=true;
} else {
epty = false;
LOGDEB(("makeAbstract:vec[%d]: [%s]\n", ipos, it->c_str()));
}
}
#endif
LOGDEB(("makeAbstract:%d: extracting\n", chron.millis()));
// Add "..." at ends of chunks
for (vector<unsigned int>::const_iterator pos = qtermposs.begin();
pos != qtermposs.end(); pos++) {
unsigned int sto = *pos + m_db->m_synthAbsWordCtxLen;
// Possibly add a ... at the end of chunk if it's not
// overlapping
if (sparseDoc.find(sto) != sparseDoc.end() &&
sparseDoc.find(sto+1) == sparseDoc.end())
sparseDoc[sto+1] = "...";
}
// Finally build the abstract by walking the map (in order of position)
string abstract;
for (map<unsigned int, string>::const_iterator it = sparseDoc.begin();
it != sparseDoc.end(); it++) {
LOGDEB2(("Abtract:output %u -> [%s]\n", it->first,it->second.c_str()));
abstract += it->second + " ";
}
// This happens for docs with no terms (only filename) indexed? I'll fix
// one day (yeah)
if (!abstract.compare("... "))
abstract.clear();
LOGDEB(("makeAbtract: done in %d mS\n", chron.millis()));
return abstract;
}
/* Rcl::Db methods ///////////////////////////////// */
Db::Db()
: m_ndb(0), m_qOpts(QO_NONE), m_idxAbsTruncLen(250), m_synthAbsLen(250),
m_synthAbsWordCtxLen(4), m_flushMb(-1),
m_curtxtsz(0), m_flushtxtsz(0), m_occtxtsz(0),
m_maxFsOccupPc(0), m_mode(Db::DbRO)
{
m_ndb = new Native(this);
RclConfig *config = RclConfig::getMainConfig();
if (config) {
config->getConfParam("maxfsoccuppc", &m_maxFsOccupPc);
config->getConfParam("idxflushmb", &m_flushMb);
}
}
Db::~Db()
{
LOGDEB1(("Db::~Db\n"));
if (m_ndb == 0)
return;
LOGDEB(("Db::~Db: isopen %d m_iswritable %d\n", m_ndb->m_isopen,
m_ndb->m_iswritable));
i_close(true);
}
list<string> Db::getStemmerNames()
{
list<string> res;
stringToStrings(Xapian::Stem::get_available_languages(), res);
return res;
}
// Generic Xapian exception catching code. We do this quite often,
// and I have no idea how to do this except for a macro
#define XCATCHERROR(MSG) \
catch (const Xapian::Error &e) { \
MSG = e.get_msg(); \
if (MSG.empty()) MSG = "Empty error message"; \
} catch (const string &s) { \
MSG = s; \
if (MSG.empty()) MSG = "Empty error message"; \
} catch (const char *s) { \
MSG = s; \
if (MSG.empty()) MSG = "Empty error message"; \
} catch (...) { \
MSG = "Caught unknown xapian exception"; \
}
bool Db::open(const string& dir, const string &stops, OpenMode mode, int qops)
{
bool keep_updated = (qops & QO_KEEP_UPDATED) != 0;
qops &= ~QO_KEEP_UPDATED;
if (m_ndb == 0)
return false;
LOGDEB(("Db::open: m_isopen %d m_iswritable %d\n", m_ndb->m_isopen,
m_ndb->m_iswritable));
if (m_ndb->m_isopen) {
// We used to return an error here but I see no reason to
if (!close())
return false;
}
if (!stops.empty())
m_stops.setFile(stops);
string ermsg;
try {
switch (mode) {
case DbUpd:
case DbTrunc:
{
int action = (mode == DbUpd) ? Xapian::DB_CREATE_OR_OPEN :
Xapian::DB_CREATE_OR_OVERWRITE;
m_ndb->wdb = Xapian::WritableDatabase(dir, action);
m_ndb->m_iswritable = true;
// We open a readonly object in addition to the r/w
// one because some operations are faster when
// performed through a Database (no forced flushes on
// allterms_begin(), ie, used in subDocs()
m_ndb->db = Xapian::Database(dir);
LOGDEB(("Db::open: lastdocid: %d\n",
m_ndb->wdb.get_lastdocid()));
if (!keep_updated) {
LOGDEB2(("Db::open: resetting updated\n"));
updated.resize(m_ndb->wdb.get_lastdocid() + 1);
for (unsigned int i = 0; i < updated.size(); i++)
updated[i] = false;
}
}
break;
case DbRO:
default:
m_ndb->m_iswritable = false;
m_ndb->db = Xapian::Database(dir);
for (list<string>::iterator it = m_extraDbs.begin();
it != m_extraDbs.end(); it++) {
string aerr;
LOGDEB(("Db::Open: adding query db [%s]\n", it->c_str()));
aerr.erase();
try {
// Make this non-fatal
m_ndb->db.add_database(Xapian::Database(*it));
} XCATCHERROR(aerr);
if (!aerr.empty())
LOGERR(("Db::Open: error while trying to add database "
"from [%s]: %s\n", it->c_str(), aerr.c_str()));
}
break;
}
m_mode = mode;
m_ndb->m_isopen = true;
m_basedir = dir;
return true;
} XCATCHERROR(ermsg);
LOGERR(("Db::open: exception while opening [%s]: %s\n",
dir.c_str(), ermsg.c_str()));
return false;
}
string Db::getDbDir()
{
return m_basedir;
}
// Note: xapian has no close call, we delete and recreate the db
bool Db::close()
{
return i_close(false);
}
bool Db::i_close(bool final)
{
if (m_ndb == 0)
return false;
LOGDEB(("Db::i_close(%d): m_isopen %d m_iswritable %d\n", final,
m_ndb->m_isopen, m_ndb->m_iswritable));
if (m_ndb->m_isopen == false && !final)
return true;
string ermsg;
try {
bool w = m_ndb->m_iswritable;
if (w)
LOGDEB(("Rcl::Db:close: xapian will close. May take some time\n"));
// Used to do a flush here. Cant see why it should be necessary.
delete m_ndb;
m_ndb = 0;
if (w)
LOGDEB(("Rcl::Db:close() xapian close done.\n"));
if (final) {
return true;
}
m_ndb = new Native(this);
if (m_ndb) {
return true;
}
LOGERR(("Rcl::Db::close(): cant recreate db object\n"));
return false;
} XCATCHERROR(ermsg);
LOGERR(("Db:close: exception while deleting db: %s\n", ermsg.c_str()));
return false;
}
bool Db::reOpen()
{
if (m_ndb && m_ndb->m_isopen) {
if (!close())
return false;
if (!open(m_basedir, "", m_mode, m_qOpts | QO_KEEP_UPDATED)) {
return false;
}
}
return true;
}
int Db::docCnt()
{
int res = -1;
string ermsg;
if (m_ndb && m_ndb->m_isopen) {
try {
res = m_ndb->m_iswritable ? m_ndb->wdb.get_doccount() :
m_ndb->db.get_doccount();
} catch (const Xapian::DatabaseModifiedError &e) {
LOGDEB(("Db::docCnt: got modified error. reopen/retry\n"));
reOpen();
res = m_ndb->m_iswritable ? m_ndb->wdb.get_doccount() :
m_ndb->db.get_doccount();
} XCATCHERROR(ermsg);
if (!ermsg.empty())
LOGERR(("Db::docCnt: got error: %s\n", ermsg.c_str()));
}
return res;
}
bool Db::addQueryDb(const string &dir)
{
LOGDEB(("Db::addQueryDb: ndb %p iswritable %d db [%s]\n", m_ndb,
(m_ndb)?m_ndb->m_iswritable:0, dir.c_str()));
if (!m_ndb)
return false;
if (m_ndb->m_iswritable)
return false;
if (find(m_extraDbs.begin(), m_extraDbs.end(), dir) == m_extraDbs.end()) {
m_extraDbs.push_back(dir);
}
return reOpen();
}
bool Db::rmQueryDb(const string &dir)
{
if (!m_ndb)
return false;
if (m_ndb->m_iswritable)
return false;
if (dir.empty()) {
m_extraDbs.clear();
} else {
list<string>::iterator it = find(m_extraDbs.begin(),
m_extraDbs.end(), dir);
if (it != m_extraDbs.end()) {
m_extraDbs.erase(it);
}
}
return reOpen();
}
bool Db::testDbDir(const string &dir)
{
string aerr;
LOGDEB(("Db::testDbDir: [%s]\n", dir.c_str()));
try {
Xapian::Database db(dir);
} XCATCHERROR(aerr);
if (!aerr.empty()) {
LOGERR(("Db::Open: error while trying to open database "
"from [%s]: %s\n", dir.c_str(), aerr.c_str()));
return false;
}
return true;
}
bool Db::isopen()
{
if (m_ndb == 0)
return false;
return m_ndb->m_isopen;
}
// Try to translate field specification into field prefix. We have a
// default table used if translations are not in the config for some
// reason (old config not updated ?). We use it only if the config
// translation fails. Also we add in there fields which should be
// indexed with no prefix (ie: abstract)
bool Db::fieldToPrefix(const string& fldname, string &pfx)
{
// This is the default table
static map<string, string> fldToPrefs;
if (fldToPrefs.empty()) {
fldToPrefs["abstract"] = "";
fldToPrefs["ext"] = "XE";
fldToPrefs["title"] = "S";
fldToPrefs["caption"] = "S";
fldToPrefs["subject"] = "S";
fldToPrefs["author"] = "A";
fldToPrefs["creator"] = "A";
fldToPrefs["from"] = "A";
fldToPrefs["keyword"] = "K";
fldToPrefs["tag"] = "K";
fldToPrefs["keywords"] = "K";
fldToPrefs["tags"] = "K";
}
string fld(fldname);
stringtolower(fld);
RclConfig *config = RclConfig::getMainConfig();
if (config && config->getFieldPrefix(fld, pfx))
return true;
map<string, string>::const_iterator it = fldToPrefs.find(fld);
if (it != fldToPrefs.end()) {
pfx = it->second;
return true;
}
return false;
}
// The text splitter callback class which receives words from the
// splitter and adds postings to the Xapian document.
class mySplitterCB : public TextSplitCB {
public:
Xapian::Document &doc; // Xapian document
Xapian::termpos basepos; // Base for document section
Xapian::termpos curpos; // Current position. Used to set basepos for the
// following section
StopList &stops;
mySplitterCB(Xapian::Document &d, StopList &_stops)
: doc(d), basepos(1), curpos(0), stops(_stops)
{}
bool takeword(const std::string &term, int pos, int, int);
void setprefix(const string& pref) {prefix = pref;}
private:
// If prefix is set, we also add a posting for the prefixed terms
// (ie: for titles, add postings for both "term" and "Sterm")
string prefix;
};
// Callback for the document to word splitting class during indexation
bool mySplitterCB::takeword(const std::string &term, int pos, int, int)
{
#if 0
LOGDEB(("mySplitterCB::takeword:splitCb: [%s]\n", term.c_str()));
string printable;
if (transcode(term, printable, "UTF-8", "ISO-8859-1")) {
LOGDEB((" [%s]\n", printable.c_str()));
}
#endif
string ermsg;
try {
if (stops.hasStops() && stops.isStop(term)) {
LOGDEB1(("Db: takeword [%s] in stop list\n", term.c_str()));
return true;
}
// Note: 1 is the within document frequency increment. It would
// be possible to assign different weigths to doc parts (ie title)
// by using a higher value
curpos = pos;
pos += basepos;
doc.add_posting(term, pos, 1);
if (!prefix.empty()) {
doc.add_posting(prefix + term, pos, 1);
}
return true;
} XCATCHERROR(ermsg);
LOGERR(("Db: xapian add_posting error %s\n", ermsg.c_str()));
return false;
}
// Unaccent and lowercase data, replace \n\r with spaces
// Removing crlfs is so that we can use the text in the document data fields.
// Use unac (with folding extension) for removing accents and casefolding
//
// Note that we always return true (but set out to "" on error). We don't
// want to stop indexation because of a bad string
bool dumb_string(const string &in, string &out)
{
out.erase();
if (in.empty())
return true;
string s1 = neutchars(in, "\n\r");
if (!unacmaybefold(s1, out, "UTF-8", true)) {
LOGINFO(("dumb_string: unac failed for [%s]\n", in.c_str()));
out.erase();
// See comment at start of func
return true;
}
return true;
}
// Let our user set the parameters for abstract processing
void Db::setAbstractParams(int idxtrunc, int syntlen, int syntctxlen)
{
LOGDEB1(("Db::setAbstractParams: trunc %d syntlen %d ctxlen %d\n",
idxtrunc, syntlen, syntctxlen));
if (idxtrunc > 0)
m_idxAbsTruncLen = idxtrunc;
if (syntlen > 0)
m_synthAbsLen = syntlen;
if (syntctxlen > 0)
m_synthAbsWordCtxLen = syntctxlen;
}
static const int MB = 1024 * 1024;
// Add document in internal form to the database: index the terms in
// the title abstract and body and add special terms for file name,
// date, mime type ... , create the document data record (more
// metadata), and update database
bool Db::add(const string &fn, const Doc &idoc, const struct stat *stp)
{
LOGDEB1(("Db::add: fn %s\n", fn.c_str()));
if (m_ndb == 0)
return false;
static int first = 1;
// Check file system full every mbyte of indexed text.
if (m_maxFsOccupPc > 0 && (first || (m_curtxtsz - m_occtxtsz) / MB >= 1)) {
LOGDEB(("Db::add: checking file system usage\n"));
int pc;
first = 0;
if (fsocc(m_basedir, &pc) && pc >= m_maxFsOccupPc) {
LOGERR(("Db::add: stop indexing: file system "
"%d%% full > max %d%%\n", pc, m_maxFsOccupPc));
return false;
}
m_occtxtsz = m_curtxtsz;
}
Doc doc = idoc;
// The title, author, abstract and keywords fields are special, they
// get stored in the document data record.
// Truncate abstract, title and keywords to reasonable lengths. If
// abstract is currently empty, we make up one with the beginning
// of the document. This is then not indexed, but part of the doc
// data so that we can return it to a query without having to
// decode the original file.
bool syntabs = false;
// Note that the map accesses by operator[] create empty entries if they
// don't exist yet.
if (doc.meta["abstract"].empty()) {
syntabs = true;
doc.meta["abstract"] = rclSyntAbs +
neutchars(truncate_to_word(doc.text, m_idxAbsTruncLen), "\n\r");
} else {
doc.meta["abstract"] =
neutchars(truncate_to_word(doc.meta["abstract"], m_idxAbsTruncLen),
"\n\r");
}
if (doc.meta["title"].empty())
doc.meta["title"] = doc.utf8fn, "\n\r";
doc.meta["title"] =
neutchars(truncate_to_word(doc.meta["title"], 150), "\n\r");
doc.meta["author"] =
neutchars(truncate_to_word(doc.meta["author"], 150), "\n\r");
doc.meta["keywords"] =
neutchars(truncate_to_word(doc.meta["keywords"], 300),"\n\r");
Xapian::Document newdocument;
mySplitterCB splitData(newdocument, m_stops);
TextSplit splitter(&splitData);
string noacc;
// Split and index file name as document term(s)
LOGDEB2(("Db::add: split file name [%s]\n", fn.c_str()));
if (dumb_string(doc.utf8fn, noacc)) {
splitter.text_to_words(noacc);
splitData.basepos += splitData.curpos + 100;
}
// Index textual metadata. These are all indexed as text with
// positions, as we may want to do phrase searches with them (this
// makes no sense for keywords by the way).
//
// The order has no importance, and we set a position gap of 100
// between fields to avoid false proximity matches.
map<string,string>::iterator meta_it;
string pfx;
for (meta_it = doc.meta.begin(); meta_it != doc.meta.end(); meta_it++) {
if (!meta_it->second.empty()) {
if (meta_it->first == "abstract" && syntabs)
continue;
if (!fieldToPrefix(meta_it->first, pfx)) {
LOGDEB(("Db::add: no prefix for field [%s], no indexing\n",
meta_it->first.c_str()));
continue;
}
LOGDEB1(("Db::add: field [%s] pfx [%s]: [%s]\n",
meta_it->first.c_str(), pfx.c_str(),
meta_it->second.c_str()));
if (!dumb_string(meta_it->second, noacc)) {
LOGERR(("Db::add: dumb_string failed\n"));
return false;
}
splitData.setprefix(pfx); // Subject
splitter.text_to_words(noacc);
splitData.setprefix(emptystring);
splitData.basepos += splitData.curpos + 100;
}
}
if (splitData.curpos < baseTextPosition)
splitData.basepos = baseTextPosition;
else
splitData.basepos += splitData.curpos + 100;
// Finally: split and index body text
LOGDEB2(("Db::add: split body\n"));
if (!dumb_string(doc.text, noacc)) {
LOGERR(("Db::add: dumb_string failed\n"));
return false;
}
splitter.text_to_words(noacc);
////// Special terms for other metadata. No positions for these.
// Mime type
newdocument.add_term("T" + doc.mimetype);
// Simple file name. This is used for file name searches only. We index
// it with a term prefix. utf8fn used to be the full path, but it's now
// the simple file name.
// We also add a term for the filename extension if any.
if (dumb_string(doc.utf8fn, noacc) && !noacc.empty()) {
string::size_type pos = noacc.rfind('.');
if (pos != string::npos && pos != noacc.length() -1) {
newdocument.add_term(string("XE") + noacc.substr(pos+1));
}
noacc = string("XSFN") + noacc;
newdocument.add_term(noacc);
}
// Pathname/ipath terms. This is used for file existence/uptodate
// checks, and unique id for the replace_document() call
// Truncate the filepath part to a reasonable length and
// replace the truncated part with a hopefully unique hash
string hash;
pathHash(fn, hash, PATHHASHLEN);
LOGDEB2(("Db::add: pathhash [%s]\n", hash.c_str()));
// Unique term: makes unique identifier for documents
// either path or path+ipath inside multidocument files.
// We only add a path term if ipath is empty. Else there will be a qterm
// (path+ipath), and a pseudo-doc will be created to stand for the file
// itself (for up to date checks). This is handled by
// DbIndexer::processone()
string uniterm;
if (doc.ipath.empty()) {
uniterm = "P" + hash;
#ifdef MTIME_IN_VALUE
#error need to fix fmtime to be stored as omega does it (bin net order str)
newdocument.add_value(VALUE_LASTMOD, doc.fmtime);
#endif
} else {
uniterm = "Q" + hash + "|" + doc.ipath;
}
newdocument.add_term(uniterm);
// Dates etc...
time_t mtime = atol(doc.dmtime.empty() ? doc.fmtime.c_str() :
doc.dmtime.c_str());
struct tm *tm = localtime(&mtime);
char buf[9];
sprintf(buf, "%04d%02d%02d",tm->tm_year+1900, tm->tm_mon + 1, tm->tm_mday);
newdocument.add_term("D" + string(buf)); // Date (YYYYMMDD)
buf[6] = '\0';
newdocument.add_term("M" + string(buf)); // Month (YYYYMM)
buf[4] = '\0';
newdocument.add_term("Y" + string(buf)); // Year (YYYY)
// Document data record. omindex has the following nl separated fields:
// - url
// - sample
// - caption (title limited to 100 chars)
// - mime type
string record = "url=file://" + fn;
record += "\nmtype=" + doc.mimetype;
record += "\nfmtime=" + doc.fmtime;
if (!doc.dmtime.empty()) {
record += "\ndmtime=" + doc.dmtime;
}
record += "\norigcharset=" + doc.origcharset;
char sizebuf[20];
sizebuf[0] = 0;
if (stp)
sprintf(sizebuf, "%ld", (long)stp->st_size);
if (sizebuf[0])
record += string("\nfbytes=") + sizebuf;
sprintf(sizebuf, "%u", (unsigned int)doc.text.length());
record += string("\ndbytes=") + sizebuf;
if (!doc.ipath.empty()) {
record += "\nipath=" + doc.ipath;
}
if (!doc.meta["title"].empty())
record += "\ncaption=" + doc.meta["title"];
if (!doc.meta["keywords"].empty())
record += "\nkeywords=" + doc.meta["keywords"];
if (!doc.meta["abstract"].empty())
record += "\nabstract=" + doc.meta["abstract"];
if (!doc.meta["author"].empty()) {
record += "\nauthor=" + doc.meta["author"];
}
record += "\n";
LOGDEB1(("Newdocument data: %s\n", record.c_str()));
newdocument.set_data(record);
const char *fnc = fn.c_str();
string ermsg;
// Add db entry or update existing entry:
try {
Xapian::docid did =
m_ndb->wdb.replace_document(uniterm, newdocument);
if (did < updated.size()) {
updated[did] = true;
LOGDEB(("Db::add: docid %d updated [%s , %s]\n", did, fnc,
doc.ipath.c_str()));
} else {
LOGDEB(("Db::add: docid %d added [%s , %s]\n", did, fnc,
doc.ipath.c_str()));
}
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::add: replace_document failed: %s\n", ermsg.c_str()));
ermsg.erase();
// FIXME: is this ever actually needed?
try {
m_ndb->wdb.add_document(newdocument);
LOGDEB(("Db::add: %s added (failed re-seek for duplicate)\n",
fnc));
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::add: add_document failed: %s\n", ermsg.c_str()));
return false;
}
}
// Test if we're over the flush threshold (limit memory usage):
m_curtxtsz += doc.text.length();
if (m_flushMb > 0) {
if ((m_curtxtsz - m_flushtxtsz) / MB >= m_flushMb) {
ermsg.erase();
LOGDEB(("Db::add: text size >= %d Mb, flushing\n", m_flushMb));
try {
m_ndb->wdb.flush();
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::add: flush() failed: %s\n", ermsg.c_str()));
return false;
}
m_flushtxtsz = m_curtxtsz;
}
}
return true;
}
// Test if given filename has changed since last indexed:
bool Db::needUpdate(const string &filename, const struct stat *stp)
{
// Chrono chron;
if (m_ndb == 0)
return false;
string hash;
pathHash(filename, hash, PATHHASHLEN);
string pterm = "P" + hash;
string ermsg;
// Look for all documents with this path. We need to look at all
// to set their existence flag. We check the update time on the
// fmtime field which will be identical for all docs inside a
// multi-document file (we currently always reindex all if the
// file changed)
for (int tries = 0; tries < 2; tries++) {
try {
// Check the date using the Pterm doc or pseudo-doc
Xapian::PostingIterator docid = m_ndb->db.postlist_begin(pterm);
if (docid == m_ndb->db.postlist_end(pterm)) {
// If no document exist with this path, we do need update
LOGDEB2(("Db::needUpdate: no path: [%s]\n", pterm.c_str()));
return true;
}
Xapian::Document doc = m_ndb->db.get_document(*docid);
// Retrieve file modification time from db stored value
#ifdef MTIME_IN_VALUE
// This is slightly faster, but we'd need to setup a conversion
// for old dbs, and it's not really worth it
string value = doc.get_value(VALUE_LASTMOD);
#error fixme make storage format compatible with omega
const char *cp = value.c_str();
#else
string data = doc.get_data();
const char *cp = strstr(data.c_str(), "fmtime=");
if (cp) {
cp += 7;
} else {
cp = strstr(data.c_str(), "mtime=");
if (cp)
cp+= 6;
}
#endif
time_t mtime = cp ? atoll(cp) : 0;
// Retrieve file size as stored in db data
cp = strstr(data.c_str(), "fbytes=");
if (cp)
cp += 7;
off_t fbytes = cp ? atoll(cp) : 0;
// Compare db time and size data to filesystem's
if (mtime != stp->st_mtime || fbytes != stp->st_size) {
LOGDEB2(("Db::needUpdate:yes: mtime: D %ld F %ld."
"sz D %ld F %ld\n", long(mtime), long(stp->st_mtime),
long(fbytes), long(stp->st_size)));
// Db is not up to date. Let's index the file
return true;
}
LOGDEB2(("Db::needUpdate: uptodate: [%s]\n", pterm.c_str()));
// Up to date.
// Set the uptodate flag for doc / pseudo doc
updated[*docid] = true;
// Set the existence flag for all the subdocs (if any)
vector<Xapian::docid> docids;
if (!m_ndb->subDocs(hash, docids)) {
LOGERR(("Rcl::Db::needUpdate: can't get subdocs list\n"));
return true;
}
for (vector<Xapian::docid>::iterator it = docids.begin();
it != docids.end(); it++) {
if (*it < updated.size()) {
LOGDEB2(("Db::needUpdate: set flag for docid %d\n", *it));
updated[*it] = true;
}
}
// LOGDEB(("Db::needUpdate: used %d mS\n", chron.millis()));
return false;
} catch (const Xapian::DatabaseModifiedError &e) {
LOGDEB(("Db::needUpdate: got modified error. reopen/retry\n"));
reOpen();
} XCATCHERROR(ermsg);
}
LOGERR(("Db::needUpdate: error while checking existence: %s\n",
ermsg.c_str()));
return true;
}
// Return list of existing stem db languages
list<string> Db::getStemLangs()
{
LOGDEB(("Db::getStemLang\n"));
list<string> dirs;
if (m_ndb == 0 || m_ndb->m_isopen == false)
return dirs;
dirs = StemDb::getLangs(m_basedir);
return dirs;
}
/**
* Delete stem db for given language
*/
bool Db::deleteStemDb(const string& lang)
{
LOGDEB(("Db::deleteStemDb(%s)\n", lang.c_str()));
if (m_ndb == 0 || m_ndb->m_isopen == false)
return false;
return StemDb::deleteDb(m_basedir, lang);
}
/**
* Create database of stem to parents associations for a given language.
* We walk the list of all terms, stem them, and create another Xapian db
* with documents indexed by a single term (the stem), and with the list of
* parent terms in the document data.
*/
bool Db::createStemDb(const string& lang)
{
LOGDEB(("Db::createStemDb(%s)\n", lang.c_str()));
if (m_ndb == 0 || m_ndb->m_isopen == false)
return false;
return StemDb::createDb(m_ndb->m_iswritable ? m_ndb->wdb : m_ndb->db,
m_basedir, lang);
}
/**
* This is called at the end of an indexing session, to delete the
* documents for files that are no longer there. This can ONLY be called
* after a full file-system tree walk, else the file existence flags will
* be wrong.
*/
bool Db::purge()
{
LOGDEB(("Db::purge\n"));
if (m_ndb == 0)
return false;
LOGDEB(("Db::purge: m_isopen %d m_iswritable %d\n", m_ndb->m_isopen,
m_ndb->m_iswritable));
if (m_ndb->m_isopen == false || m_ndb->m_iswritable == false)
return false;
// For xapian versions up to 1.0.1, deleting a non-existant
// document would trigger an exception that would discard any
// pending update. This could lose both previous added documents
// or deletions. Adding the flush before the delete pass ensured
// that any added document would go to the index. Kept here
// because it doesn't really hurt.
try {
m_ndb->wdb.flush();
} catch (...) {
LOGERR(("Db::purge: 1st flush failed\n"));
}
// Walk the document array and delete any xapian document whose
// flag is not set (we did not see its source during indexing).
for (Xapian::docid docid = 1; docid < updated.size(); ++docid) {
if (!updated[docid]) {
try {
m_ndb->wdb.delete_document(docid);
LOGDEB(("Db::purge: deleted document #%d\n", docid));
} catch (const Xapian::DocNotFoundError &) {
LOGDEB(("Db::purge: document #%d not found\n", docid));
} catch (const Xapian::Error &e) {
LOGERR(("Db::purge: document #%d: %s\n", e.get_msg().c_str()));
} catch (...) {
LOGERR(("Db::purge: document #%d: unknown error\n"));
}
}
}
try {
m_ndb->wdb.flush();
} catch (...) {
LOGERR(("Db::purge: 2nd flush failed\n"));
}
return true;
}
/** Delete document(s) for given filename */
bool Db::purgeFile(const string &fn)
{
LOGDEB(("Db:purgeFile: [%s]\n", fn.c_str()));
if (m_ndb == 0)
return false;
Xapian::WritableDatabase db = m_ndb->wdb;
string hash;
pathHash(fn, hash, PATHHASHLEN);
string pterm = "P" + hash;
string ermsg;
try {
Xapian::PostingIterator docid = db.postlist_begin(pterm);
if (docid == db.postlist_end(pterm))
return true;
LOGDEB(("purgeFile: delete docid %d\n", *docid));
db.delete_document(*docid);
vector<Xapian::docid> docids;
m_ndb->subDocs(hash, docids);
LOGDEB(("purgeFile: subdocs cnt %d\n", docids.size()));
for (vector<Xapian::docid>::iterator it = docids.begin();
it != docids.end(); it++) {
LOGDEB2(("Db::purgeFile: delete subdoc %d\n", *it));
db.delete_document(*it);
}
return true;
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::purgeFile: %s\n", ermsg.c_str()));
}
return false;
}
bool Db::filenameWildExp(const string& fnexp, list<string>& names)
{
// File name search, with possible wildcards.
// We expand wildcards by scanning the filename terms (prefixed
// with XSFN) from the database.
// We build an OR query with the expanded values if any.
string pattern;
dumb_string(fnexp, pattern);
// If pattern is not quoted, and has no wildcards, we add * at
// each end: match any substring
if (pattern[0] == '"' && pattern[pattern.size()-1] == '"') {
pattern = pattern.substr(1, pattern.size() -2);
} else if (pattern.find_first_of("*?[") == string::npos) {
pattern = "*" + pattern + "*";
} // else let it be
LOGDEB((" pattern: [%s]\n", pattern.c_str()));
// Match pattern against all file names in the db
string ermsg;
try {
Xapian::TermIterator it = m_ndb->db.allterms_begin();
it.skip_to("XSFN");
for (;it != m_ndb->db.allterms_end(); it++) {
if ((*it).find("XSFN") != 0)
break;
string fn = (*it).substr(4);
LOGDEB2(("Matching [%s] and [%s]\n", pattern.c_str(), fn.c_str()));
if (fnmatch(pattern.c_str(), fn.c_str(), 0) != FNM_NOMATCH) {
names.push_back((*it).c_str());
}
// Limit the match count
if (names.size() > 1000) {
LOGERR(("Db::filenameWildExp: too many matched file names\n"));
break;
}
}
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("filenameWildExp: xapian error: %s\n", ermsg.c_str()));
return false;
}
if (names.empty()) {
// Build an impossible query: we know its impossible because we
// control the prefixes!
names.push_back("XIMPOSSIBLE");
}
return true;
}
// Prepare query out of user search data
bool Db::setQuery(RefCntr<SearchData> sdata, int opts,
const string& stemlang)
{
if (!m_ndb) {
LOGERR(("Db::setQuery: no db!\n"));
return false;
}
m_reason.erase();
LOGDEB(("Db::setQuery:\n"));
m_filterTopDir = sdata->getTopdir();
m_dbindices.clear();
m_qOpts = opts;
m_ndb->m_termfreqs.clear();
Xapian::Query xq;
if (!sdata->toNativeQuery(*this, &xq,
(opts & Db::QO_STEM) ? stemlang : "")) {
m_reason += sdata->getReason();
return false;
}
m_ndb->query = xq;
string ermsg;
string d;
try {
delete m_ndb->enquire;
m_ndb->enquire = new Xapian::Enquire(m_ndb->db);
m_ndb->enquire->set_query(m_ndb->query);
m_ndb->mset = Xapian::MSet();
// Get the query description and trim the "Xapian::Query"
d = m_ndb->query.get_description();
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGDEB(("Db::SetQuery: xapian error %s\n", ermsg.c_str()));
return false;
}
if (d.find("Xapian::Query") == 0)
d.erase(0, strlen("Xapian::Query"));
sdata->setDescription(d);
LOGDEB(("Db::SetQuery: Q: %s\n", sdata->getDescription().c_str()));
return true;
}
class TermMatchCmpByWcf {
public:
int operator()(const TermMatchEntry& l, const TermMatchEntry& r) {
return r.wcf - l.wcf < 0;
}
};
class TermMatchCmpByTerm {
public:
int operator()(const TermMatchEntry& l, const TermMatchEntry& r) {
return l.term.compare(r.term) > 0;
}
};
class TermMatchTermEqual {
public:
int operator()(const TermMatchEntry& l, const TermMatchEntry& r) {
return !l.term.compare(r.term);
}
};
bool Db::stemExpand(const string &lang, const string &term,
list<TermMatchEntry>& result, int max)
{
list<string> dirs = m_extraDbs;
dirs.push_front(m_basedir);
for (list<string>::iterator it = dirs.begin();
it != dirs.end(); it++) {
list<string> more;
StemDb::stemExpand(*it, lang, term, more);
LOGDEB1(("Db::stemExpand: Got %d from %s\n",
more.size(), it->c_str()));
result.insert(result.end(), more.begin(), more.end());
}
LOGDEB1(("Db:::stemExpand: final count %d \n", result.size()));
return true;
}
// Characters that can begin a wildcard or regexp expression. We use skipto
// to begin the allterms search with terms that begin with the portion of
// the input string prior to these chars.
const string wildSpecChars = "*?[";
const string regSpecChars = "(.[{";
// Find all index terms that match a wildcard or regular expression
bool Db::termMatch(MatchType typ, const string &lang,
const string &root,
list<TermMatchEntry>& res,
int max)
{
if (!m_ndb || !m_ndb->m_isopen)
return false;
Xapian::Database db = m_ndb->m_iswritable ? m_ndb->wdb: m_ndb->db;
res.clear();
// Get rid of capitals and accents
string droot;
dumb_string(root, droot);
string nochars = typ == ET_WILD ? wildSpecChars : regSpecChars;
if (typ == ET_STEM) {
if (!stemExpand(lang, root, res, max))
return false;
res.sort();
res.unique();
for (list<TermMatchEntry>::iterator it = res.begin();
it != res.end(); it++) {
it->wcf = db.get_collection_freq(it->term);
LOGDEB1(("termMatch: %d [%s]\n", it->wcf, it->term.c_str()));
}
} else {
regex_t reg;
int errcode;
if (typ == ET_REGEXP) {
string mroot = droot;
if ((errcode = regcomp(®, mroot.c_str(),
REG_EXTENDED|REG_NOSUB))) {
char errbuf[200];
regerror(errcode, ®, errbuf, 199);
LOGERR(("termMatch: regcomp failed: %s\n", errbuf));
res.push_back(string(errbuf));
regfree(®);
return false;
}
}
// Find the initial section before any special char
string::size_type es = droot.find_first_of(nochars);
string is;
switch (es) {
case string::npos: is = droot;break;
case 0: break;
default: is = droot.substr(0, es);break;
}
LOGDEB(("termMatch: initsec: [%s]\n", is.c_str()));
Xapian::TermIterator it = db.allterms_begin();
if (!is.empty())
it.skip_to(is.c_str());
for (int n = 0;it != db.allterms_end(); it++) {
// If we're beyond the terms matching the initial string, end
if (!is.empty() && (*it).find(is) != 0)
break;
// Don't match special internal terms beginning with uppercase ascii
if ((*it).at(0) >= 'A' && (*it).at(0) <= 'Z')
continue;
if (typ == ET_WILD) {
if (fnmatch(droot.c_str(), (*it).c_str(), 0) == FNM_NOMATCH)
continue;
} else {
if (regexec(®, (*it).c_str(), 0, 0, 0))
continue;
}
// Do we want stem expansion here? We don't do it for now
res.push_back(TermMatchEntry(*it, it.get_termfreq()));
++n;
}
if (typ == ET_REGEXP) {
regfree(®);
}
}
TermMatchCmpByTerm tcmp;
res.sort(tcmp);
TermMatchTermEqual teq;
res.unique(teq);
TermMatchCmpByWcf wcmp;
res.sort(wcmp);
if (max > 0) {
res.resize(MIN(res.size(), (unsigned int)max));
}
return true;
}
/** Term list walking. */
class TermIter {
public:
Xapian::TermIterator it;
Xapian::Database db;
};
TermIter *Db::termWalkOpen()
{
if (!m_ndb || !m_ndb->m_isopen)
return 0;
TermIter *tit = new TermIter;
if (tit) {
tit->db = m_ndb->m_iswritable ? m_ndb->wdb: m_ndb->db;
string ermsg;
try {
tit->it = tit->db.allterms_begin();
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::termWalkOpen: xapian error: %s\n", ermsg.c_str()));
return 0;
}
}
return tit;
}
bool Db::termWalkNext(TermIter *tit, string &term)
{
string ermsg;
try {
if (tit && tit->it != tit->db.allterms_end()) {
term = *(tit->it)++;
return true;
}
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::termWalkOpen: xapian error: %s\n", ermsg.c_str()));
}
return false;
}
void Db::termWalkClose(TermIter *tit)
{
try {
delete tit;
} catch (...) {}
}
bool Db::termExists(const string& word)
{
if (!m_ndb || !m_ndb->m_isopen)
return 0;
Xapian::Database db = m_ndb->m_iswritable ? m_ndb->wdb: m_ndb->db;
string ermsg;
try {
if (!db.term_exists(word))
return false;
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::termWalkOpen: xapian error: %s\n", ermsg.c_str()));
return false;
}
return true;
}
bool Db::stemDiffers(const string& lang, const string& word,
const string& base)
{
Xapian::Stem stemmer(lang);
if (!stemmer(word).compare(stemmer(base))) {
LOGDEB2(("Rcl::Db::stemDiffers: same for %s and %s\n",
word.c_str(), base.c_str()));
return false;
}
return true;
}
bool Db::getQueryTerms(list<string>& terms)
{
if (!m_ndb)
return false;
terms.clear();
Xapian::TermIterator it;
string ermsg;
try {
for (it = m_ndb->query.get_terms_begin();
it != m_ndb->query.get_terms_end(); it++) {
terms.push_back(*it);
}
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("getQueryTerms: xapian error: %s\n", ermsg.c_str()));
return false;
}
return true;
}
bool Db::getMatchTerms(const Doc& doc, list<string>& terms)
{
if (!m_ndb || !m_ndb->enquire) {
LOGERR(("Db::getMatchTerms: no query opened\n"));
return -1;
}
terms.clear();
Xapian::TermIterator it;
Xapian::docid id = Xapian::docid(doc.xdocid);
string ermsg;
try {
for (it=m_ndb->enquire->get_matching_terms_begin(id);
it != m_ndb->enquire->get_matching_terms_end(id); it++) {
terms.push_back(*it);
}
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("getQueryTerms: xapian error: %s\n", ermsg.c_str()));
return false;
}
return true;
}
// Mset size
static const int qquantum = 30;
int Db::getResCnt()
{
if (!m_ndb || !m_ndb->enquire) {
LOGERR(("Db::getResCnt: no query opened\n"));
return -1;
}
string ermsg;
if (m_ndb->mset.size() <= 0) {
try {
m_ndb->mset = m_ndb->enquire->get_mset(0, qquantum);
} catch (const Xapian::DatabaseModifiedError &error) {
m_ndb->db.reopen();
m_ndb->mset = m_ndb->enquire->get_mset(0, qquantum);
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("enquire->get_mset: exception: %s\n", ermsg.c_str()));
return -1;
}
}
int ret = -1;
try {
ret = m_ndb->mset.get_matches_lower_bound();
} catch (...) {}
return ret;
}
// Get document at rank i in query (i is the index in the whole result
// set, as in the enquire class. We check if the current mset has the
// doc, else ask for an other one. We use msets of 10 documents. Don't
// know if the whole thing makes sense at all but it seems to work.
//
// If there is a postquery filter (ie: file names), we have to
// maintain a correspondance from the sequential external index
// sequence to the internal Xapian hole-y one (the holes being the documents
// that dont match the filter).
bool Db::getDoc(int exti, Doc &doc, int *percent)
{
LOGDEB1(("Db::getDoc: exti %d\n", exti));
if (!m_ndb || !m_ndb->enquire) {
LOGERR(("Db::getDoc: no query opened\n"));
return false;
}
// For now the only post-query filter is on dir subtree
bool postqfilter = !m_filterTopDir.empty();
LOGDEB1(("Topdir %s postqflt %d\n", m_asdata.topdir.c_str(), postqfilter));
int xapi;
if (postqfilter) {
// There is a postquery filter, does this fall in already known area ?
if (exti >= (int)m_dbindices.size()) {
// Have to fetch xapian docs and filter until we get
// enough or fail
m_dbindices.reserve(exti+1);
// First xapian doc we fetch is the one after last stored
int first = m_dbindices.size() > 0 ? m_dbindices.back() + 1 : 0;
// Loop until we get enough docs
while (exti >= (int)m_dbindices.size()) {
LOGDEB(("Db::getDoc: fetching %d starting at %d\n",
qquantum, first));
try {
m_ndb->mset = m_ndb->enquire->get_mset(first, qquantum);
} catch (const Xapian::DatabaseModifiedError &error) {
m_ndb->db.reopen();
m_ndb->mset = m_ndb->enquire->get_mset(first, qquantum);
} catch (const Xapian::Error & error) {
LOGERR(("enquire->get_mset: exception: %s\n",
error.get_msg().c_str()));
abort();
}
if (m_ndb->mset.empty()) {
LOGDEB(("Db::getDoc: got empty mset\n"));
return false;
}
first = m_ndb->mset.get_firstitem();
for (unsigned int i = 0; i < m_ndb->mset.size() ; i++) {
LOGDEB(("Db::getDoc: [%d]\n", i));
Xapian::Document xdoc = m_ndb->mset[i].get_document();
if (m_ndb->filterMatch(this, xdoc)) {
m_dbindices.push_back(first + i);
}
}
first = first + m_ndb->mset.size();
}
}
xapi = m_dbindices[exti];
} else {
xapi = exti;
}
// From there on, we work with a xapian enquire item number. Fetch it
int first = m_ndb->mset.get_firstitem();
int last = first + m_ndb->mset.size() -1;
if (!(xapi >= first && xapi <= last)) {
LOGDEB(("Fetching for first %d, count %d\n", xapi, qquantum));
try {
m_ndb->mset = m_ndb->enquire->get_mset(xapi, qquantum);
} catch (const Xapian::DatabaseModifiedError &error) {
m_ndb->db.reopen();
m_ndb->mset = m_ndb->enquire->get_mset(xapi, qquantum);
} catch (const Xapian::Error & error) {
LOGERR(("enquire->get_mset: exception: %s\n",
error.get_msg().c_str()));
abort();
}
if (m_ndb->mset.empty())
return false;
first = m_ndb->mset.get_firstitem();
last = first + m_ndb->mset.size() -1;
}
LOGDEB1(("Db::getDoc: Qry [%s] win [%d-%d] Estimated results: %d",
m_ndb->query.get_description().c_str(),
first, last,
m_ndb->mset.get_matches_lower_bound()));
Xapian::Document xdoc = m_ndb->mset[xapi-first].get_document();
Xapian::docid docid = *(m_ndb->mset[xapi-first]);
if (percent)
*percent = m_ndb->mset.convert_to_percent(m_ndb->mset[xapi-first]);
// Parse xapian document's data and populate doc fields
string data = xdoc.get_data();
return m_ndb->dbDataToRclDoc(docid, data, doc);
}
bool Db::makeDocAbstract(Doc &doc, string& abstract)
{
LOGDEB1(("Db::makeDocAbstract: exti %d\n", exti));
if (!m_ndb || !m_ndb->enquire) {
LOGERR(("Db::makeDocAbstract: no query opened\n"));
return false;
}
list<string> terms;
getQueryTerms(terms);
abstract = m_ndb->makeAbstract(doc.xdocid, terms);
return true;
}
// Retrieve document defined by file name and internal path.
bool Db::getDoc(const string &fn, const string &ipath, Doc &doc, int *pc)
{
LOGDEB(("Db:getDoc: [%s] (%d) [%s]\n", fn.c_str(), fn.length(),
ipath.c_str()));
if (m_ndb == 0)
return false;
// Initialize what we can in any case. If this is history, caller
// will make partial display in case of error
doc.ipath = ipath;
doc.url = string("file://") + fn;
if (*pc)
*pc = 100;
string hash;
pathHash(fn, hash, PATHHASHLEN);
string pqterm = ipath.empty() ? "P" + hash : "Q" + hash + "|" + ipath;
string ermsg;
try {
if (!m_ndb->db.term_exists(pqterm)) {
// Document found in history no longer in the database.
// We return true (because their might be other ok docs further)
// but indicate the error with pc = -1
if (*pc)
*pc = -1;
LOGINFO(("Db:getDoc: no such doc in index: [%s] (len %d)\n",
pqterm.c_str(), pqterm.length()));
return true;
}
Xapian::PostingIterator docid = m_ndb->db.postlist_begin(pqterm);
Xapian::Document xdoc = m_ndb->db.get_document(*docid);
string data = xdoc.get_data();
list<string> terms;
return m_ndb->dbDataToRclDoc(*docid, data, doc);
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::getDoc: %s\n", ermsg.c_str()));
}
return false;
}
list<string> Db::expand(const Doc &doc)
{
list<string> res;
if (!m_ndb || !m_ndb->enquire) {
LOGERR(("Db::expand: no query opened\n"));
return res;
}
string ermsg;
for (int tries = 0; tries < 2; tries++) {
try {
Xapian::RSet rset;
rset.add_document(Xapian::docid(doc.xdocid));
// We don't exclude the original query terms.
Xapian::ESet eset = m_ndb->enquire->get_eset(20, rset, false);
LOGDEB(("ESet terms:\n"));
// We filter out the special terms
for (Xapian::ESetIterator it = eset.begin();
it != eset.end(); it++) {
LOGDEB((" [%s]\n", (*it).c_str()));
if ((*it).empty() || ((*it).at(0)>='A' && (*it).at(0)<='Z'))
continue;
res.push_back(*it);
if (res.size() >= 10)
break;
}
} catch (const Xapian::DatabaseModifiedError &error) {
continue;
} XCATCHERROR(ermsg);
if (!ermsg.empty()) {
LOGERR(("Db::expand: xapian error %s\n", ermsg.c_str()));
res.clear();
}
break;
}
return res;
}
#ifndef NO_NAMESPACES
}
#endif