mirror of
https://github.com/mongodb/mongo.git
synced 2024-11-30 17:10:48 +01:00
893 lines
34 KiB
C++
893 lines
34 KiB
C++
// query.cpp
|
|
|
|
/**
|
|
* Copyright (C) 2008 10gen Inc.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License, version 3,
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* 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 Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "stdafx.h"
|
|
#include "query.h"
|
|
#include "pdfile.h"
|
|
#include "jsobj.h"
|
|
#include "../util/builder.h"
|
|
#include <time.h>
|
|
#include "introspect.h"
|
|
#include "btree.h"
|
|
#include "../util/lruishmap.h"
|
|
#include "javajs.h"
|
|
#include "json.h"
|
|
#include "repl.h"
|
|
#include "replset.h"
|
|
#include "scanandorder.h"
|
|
|
|
namespace mongo {
|
|
|
|
/* We cut off further objects once we cross this threshold; thus, you might get
|
|
a little bit more than this, it is a threshold rather than a limit.
|
|
*/
|
|
const int MaxBytesToReturnToClientAtOnce = 4 * 1024 * 1024;
|
|
|
|
//ns->query->DiskLoc
|
|
LRUishMap<BSONObj,DiskLoc,5> lrutest(123);
|
|
|
|
int nextCursorId = 1;
|
|
extern bool useCursors;
|
|
|
|
void appendElementHandlingGtLt(BSONObjBuilder& b, BSONElement& e);
|
|
|
|
int matchDirection( const BSONObj &index, const BSONObj &sort ) {
|
|
int direction = 0;
|
|
BSONObjIterator i( index );
|
|
BSONObjIterator s( sort );
|
|
while ( 1 ) {
|
|
BSONElement ie = i.next();
|
|
BSONElement se = s.next();
|
|
if ( ie.eoo() ) {
|
|
if ( !se.eoo() )
|
|
return 0;
|
|
return direction;
|
|
}
|
|
if ( strcmp( ie.fieldName(), se.fieldName() ) != 0 )
|
|
return 0;
|
|
|
|
int d = ie.number() == se.number() ? 1 : -1;
|
|
if ( direction == 0 )
|
|
direction = d;
|
|
else if ( direction != d )
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* todo: _ cache query plans
|
|
_ use index on partial match with the query
|
|
|
|
parameters
|
|
query - the query, e.g., { name: 'joe' }
|
|
order - order by spec, e.g., { name: 1 } 1=ASC, -1=DESC
|
|
simpleKeyMatch - set to true if the query is purely for a single key value
|
|
unchanged otherwise.
|
|
*/
|
|
auto_ptr<Cursor> getIndexCursor(const char *ns, BSONObj& query, BSONObj& order, bool *simpleKeyMatch = 0, bool *isSorted = 0, string *hint = 0) {
|
|
NamespaceDetails *d = nsdetails(ns);
|
|
if ( d == 0 ) return auto_ptr<Cursor>();
|
|
|
|
if ( hint && !hint->empty() ) {
|
|
/* todo: more work needed. doesn't handle $lt & $gt for example.
|
|
waiting for query optimizer rewrite (see queryoptimizer.h) before finishing the work.
|
|
*/
|
|
for (int i = 0; i < d->nIndexes; i++ ) {
|
|
IndexDetails& ii = d->indexes[i];
|
|
if ( ii.indexName() == *hint ) {
|
|
BSONObj startKey = ii.getKeyFromQuery(query);
|
|
int direction = 1;
|
|
if ( simpleKeyMatch )
|
|
*simpleKeyMatch = query.nFields() == startKey.nFields();
|
|
if ( isSorted ) *isSorted = false;
|
|
return auto_ptr<Cursor>(
|
|
new BtreeCursor(ii, startKey, direction, query));
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( !order.isEmpty() ) {
|
|
// order by
|
|
for (int i = 0; i < d->nIndexes; i++ ) {
|
|
BSONObj idxInfo = d->indexes[i].info.obj(); // { name:, ns:, key: }
|
|
assert( strcmp(ns, idxInfo.getStringField("ns")) == 0 );
|
|
BSONObj idxKey = idxInfo.getObjectField("key");
|
|
int direction = matchDirection( idxKey, order );
|
|
if ( direction != 0 ) {
|
|
BSONObjBuilder b;
|
|
DEV out() << " using index " << d->indexes[i].indexNamespace() << '\n';
|
|
if ( isSorted )
|
|
*isSorted = true;
|
|
|
|
return auto_ptr<Cursor>(new BtreeCursor(d->indexes[i], BSONObj(), direction, query));
|
|
}
|
|
}
|
|
}
|
|
|
|
// queryFields, e.g. { 'name' }
|
|
set<string> queryFields;
|
|
query.getFieldNames(queryFields);
|
|
|
|
// regular query without order by
|
|
for (int i = 0; i < d->nIndexes; i++ ) {
|
|
BSONObj idxInfo = d->indexes[i].info.obj(); // { name:, ns:, key: }
|
|
BSONObj idxKey = idxInfo.getObjectField("key");
|
|
set<string> keyFields;
|
|
idxKey.getFieldNames(keyFields);
|
|
|
|
// keyFields: e.g. { "name" }
|
|
bool match = keyFields == queryFields;
|
|
if ( 0 && !match && queryFields.size() > 1 && simpleKeyMatch == 0 && keyFields.size() == 1 ) {
|
|
// TEMP
|
|
string s = *(keyFields.begin());
|
|
match = queryFields.count(s) == 1;
|
|
}
|
|
|
|
if ( match ) {
|
|
bool simple = true;
|
|
//BSONObjBuilder b;
|
|
BSONObj q = query.extractFieldsUnDotted(idxKey);
|
|
assert(q.objsize() != 0); // guard against a seg fault if details is 0
|
|
/* regexp: only supported if form is /^text/ */
|
|
BSONObjBuilder b2;
|
|
BSONObjIterator it(q);
|
|
bool first = true;
|
|
while ( it.more() ) {
|
|
BSONElement e = it.next();
|
|
if ( e.eoo() )
|
|
break;
|
|
|
|
// GT/LT
|
|
if ( e.type() == Object ) {
|
|
int op = getGtLtOp(e);
|
|
if ( op ) {
|
|
if ( !first || !it.next().eoo() ) {
|
|
// compound keys with GT/LT not supported yet via index.
|
|
goto fail;
|
|
}
|
|
if ( op >= JSMatcher::opIN ) {
|
|
// $in does not use an index (at least yet, should when # of elems is tiny)
|
|
// likewise $ne
|
|
goto fail;
|
|
}
|
|
|
|
{
|
|
BSONObjIterator k(e.embeddedObject());
|
|
k.next();
|
|
if ( !k.next().eoo() ) {
|
|
/* compound query like { $lt : 9, $gt : 2 }
|
|
for those our method below won't work.
|
|
need more work on "stopOnMiss" in general -- may
|
|
be issues with it. so fix this to use index after
|
|
that is fixed.
|
|
*/
|
|
OCCASIONALLY out() << "finish query optimizer for lt gt compound\n";
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
int direction = - JSMatcher::opDirection(op);
|
|
return auto_ptr<Cursor>( new BtreeCursor(
|
|
d->indexes[i],
|
|
BSONObj(),
|
|
direction, query) );
|
|
}
|
|
}
|
|
|
|
first = false;
|
|
if ( e.type() == RegEx ) {
|
|
simple = false;
|
|
if ( *e.regexFlags() )
|
|
goto fail;
|
|
const char *re = e.regex();
|
|
const char *p = re;
|
|
if ( *p++ != '^' ) goto fail;
|
|
while ( *p ) {
|
|
if ( *p == ' ' || (*p>='0'&&*p<='9') || (*p>='@'&&*p<='Z') || (*p>='a'&&*p<='z') )
|
|
;
|
|
else
|
|
goto fail;
|
|
p++;
|
|
}
|
|
if ( it.more() && !it.next().eoo() ) // we must be the last part of the key (for now until we are smarter)
|
|
goto fail;
|
|
// ok!
|
|
b2.append(e.fieldName(), re+1);
|
|
break;
|
|
}
|
|
else {
|
|
b2.append(e);
|
|
//appendElementHandlingGtLt(b2, e);
|
|
}
|
|
}
|
|
BSONObj q2 = b2.done();
|
|
DEV out() << "using index " << d->indexes[i].indexNamespace() << endl;
|
|
if ( simple && simpleKeyMatch ) *simpleKeyMatch = true;
|
|
return auto_ptr<Cursor>(
|
|
new BtreeCursor(d->indexes[i], q2, 1, query));
|
|
}
|
|
}
|
|
|
|
fail:
|
|
DEV out() << "getIndexCursor fail " << ns << '\n';
|
|
return auto_ptr<Cursor>();
|
|
}
|
|
|
|
/* ns: namespace, e.g. <database>.<collection>
|
|
pattern: the "where" clause / criteria
|
|
justOne: stop after 1 match
|
|
*/
|
|
int deleteObjects(const char *ns, BSONObj pattern, bool justOne, bool god) {
|
|
if ( strstr(ns, ".system.") && !god ) {
|
|
/*if( strstr(ns, ".system.namespaces") ){
|
|
out() << "info: delete on system namespace " << ns << '\n';
|
|
}
|
|
else if( strstr(ns, ".system.indexes") ) {
|
|
out() << "info: delete on system namespace " << ns << '\n';
|
|
}
|
|
else*/ {
|
|
out() << "ERROR: attempt to delete in system namespace " << ns << endl;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int nDeleted = 0;
|
|
BSONObj order;
|
|
auto_ptr<Cursor> c = getIndexCursor(ns, pattern, order);
|
|
if ( c.get() == 0 )
|
|
c = theDataFileMgr.findAll(ns);
|
|
JSMatcher matcher(pattern, c->indexKeyPattern());
|
|
|
|
while ( c->ok() ) {
|
|
Record *r = c->_current();
|
|
DiskLoc rloc = c->currLoc();
|
|
BSONObj js(r);
|
|
|
|
bool deep;
|
|
if ( !matcher.matches(js, &deep) ) {
|
|
c->advance(); // advance must be after noMoreMatches() because it uses currKey()
|
|
}
|
|
else {
|
|
c->advance(); // must advance before deleting as the next ptr will die
|
|
assert( !deep || !c->getsetdup(rloc) ); // can't be a dup, we deleted it!
|
|
if ( !justOne )
|
|
c->noteLocation();
|
|
|
|
theDataFileMgr.deleteRecord(ns, r, rloc);
|
|
nDeleted++;
|
|
if ( justOne )
|
|
break;
|
|
c->checkLocation();
|
|
}
|
|
}
|
|
|
|
return nDeleted;
|
|
}
|
|
|
|
struct Mod {
|
|
enum Op { INC, SET } op;
|
|
const char *fieldName;
|
|
double *ndouble;
|
|
int *nint;
|
|
void setn(double n) {
|
|
if ( ndouble ) *ndouble = n;
|
|
else *nint = (int) n;
|
|
}
|
|
double getn() {
|
|
return ndouble ? *ndouble : *nint;
|
|
}
|
|
int type;
|
|
static void getMods(vector<Mod>& mods, BSONObj from);
|
|
static void applyMods(vector<Mod>& mods, BSONObj obj);
|
|
};
|
|
|
|
void Mod::applyMods(vector<Mod>& mods, BSONObj obj) {
|
|
for ( vector<Mod>::iterator i = mods.begin(); i != mods.end(); i++ ) {
|
|
Mod& m = *i;
|
|
BSONElement e = obj.findElement(m.fieldName);
|
|
if ( e.isNumber() ) {
|
|
if ( m.op == INC ) {
|
|
e.setNumber( e.number() + m.getn() );
|
|
m.setn( e.number() );
|
|
// *m.n = e.number() += *m.n;
|
|
} else {
|
|
e.setNumber( m.getn() ); // $set or $SET
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* get special operations like $inc
|
|
{ $inc: { a:1, b:1 } }
|
|
{ $set: { a:77 } }
|
|
NOTE: MODIFIES source from object!
|
|
*/
|
|
void Mod::getMods(vector<Mod>& mods, BSONObj from) {
|
|
BSONObjIterator it(from);
|
|
while ( it.more() ) {
|
|
BSONElement e = it.next();
|
|
const char *fn = e.fieldName();
|
|
if ( *fn == '$' && e.type() == Object &&
|
|
fn[4] == 0 ) {
|
|
BSONObj j = e.embeddedObject();
|
|
BSONObjIterator jt(j);
|
|
Op op = Mod::SET;
|
|
if ( strcmp("$inc",fn) == 0 ) {
|
|
op = Mod::INC;
|
|
// we rename to $SET instead of $set so that on an op like
|
|
// { $set: {x:1}, $inc: {y:1} }
|
|
// we don't get two "$set" fields which isn't allowed
|
|
strcpy((char *) fn, "$SET");
|
|
}
|
|
while ( jt.more() ) {
|
|
BSONElement f = jt.next();
|
|
if ( f.eoo() )
|
|
break;
|
|
Mod m;
|
|
m.op = op;
|
|
m.fieldName = f.fieldName();
|
|
if ( f.isNumber() ) {
|
|
if ( f.type() == NumberDouble ) {
|
|
m.ndouble = (double *) f.value();
|
|
m.nint = 0;
|
|
}
|
|
else {
|
|
m.ndouble = 0;
|
|
m.nint = (int *) f.value();
|
|
}
|
|
mods.push_back( m );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* todo:
|
|
_ smart requery find record immediately
|
|
returns:
|
|
2: we did applyMods() but didn't logOp()
|
|
5: we did applyMods() and did logOp() (so don't do it again)
|
|
(clean these up later...)
|
|
*/
|
|
int _updateObjects(const char *ns, BSONObj updateobj, BSONObj pattern, bool upsert, stringstream& ss, bool logop=false) {
|
|
//out() << "TEMP BAD";
|
|
//lrutest.find(updateobj);
|
|
|
|
int profile = database->profile;
|
|
|
|
// out() << "update ns:" << ns << " objsize:" << updateobj.objsize() << " queryobjsize:" <<
|
|
// pattern.objsize();
|
|
|
|
if ( strstr(ns, ".system.") ) {
|
|
out() << "\nERROR: attempt to update in system namespace " << ns << endl;
|
|
ss << " can't update system namespace ";
|
|
return 0;
|
|
}
|
|
|
|
int nscanned = 0;
|
|
{
|
|
BSONObj order;
|
|
auto_ptr<Cursor> c = getIndexCursor(ns, pattern, order);
|
|
if ( c.get() == 0 )
|
|
c = theDataFileMgr.findAll(ns);
|
|
JSMatcher matcher(pattern, c->indexKeyPattern());
|
|
while ( c->ok() ) {
|
|
Record *r = c->_current();
|
|
nscanned++;
|
|
BSONObj js(r);
|
|
if ( !matcher.matches(js) ) {
|
|
}
|
|
else {
|
|
/* note: we only update one row and quit. if you do multiple later,
|
|
be careful or multikeys in arrays could break things badly. best
|
|
to only allow updating a single row with a multikey lookup.
|
|
*/
|
|
|
|
if ( profile )
|
|
ss << " nscanned:" << nscanned;
|
|
|
|
/* look for $inc etc. note as listed here, all fields to inc must be this type, you can't set some
|
|
regular ones at the moment. */
|
|
const char *firstField = updateobj.firstElement().fieldName();
|
|
if ( firstField[0] == '$' ) {
|
|
vector<Mod> mods;
|
|
Mod::getMods(mods, updateobj);
|
|
NamespaceDetailsTransient& ndt = NamespaceDetailsTransient::get(ns);
|
|
set<string>& idxKeys = ndt.indexKeys();
|
|
for ( vector<Mod>::iterator i = mods.begin(); i != mods.end(); i++ ) {
|
|
if ( idxKeys.count(i->fieldName) ) {
|
|
uassert("can't $inc/$set an indexed field", false);
|
|
}
|
|
}
|
|
|
|
Mod::applyMods(mods, c->currLoc().obj());
|
|
if ( profile )
|
|
ss << " fastmod ";
|
|
if ( logop ) {
|
|
if ( mods.size() ) {
|
|
logOp("u", ns, updateobj, &pattern, &upsert);
|
|
return 5;
|
|
}
|
|
}
|
|
return 2;
|
|
}
|
|
|
|
theDataFileMgr.update(ns, r, c->currLoc(), updateobj.objdata(), updateobj.objsize(), ss);
|
|
return 1;
|
|
}
|
|
c->advance();
|
|
}
|
|
}
|
|
|
|
if ( profile )
|
|
ss << " nscanned:" << nscanned;
|
|
|
|
if ( upsert ) {
|
|
if ( updateobj.firstElement().fieldName()[0] == '$' ) {
|
|
/* upsert of an $inc. build a default */
|
|
vector<Mod> mods;
|
|
Mod::getMods(mods, updateobj);
|
|
BSONObjBuilder b;
|
|
b.appendElements(pattern);
|
|
for ( vector<Mod>::iterator i = mods.begin(); i != mods.end(); i++ )
|
|
b.append(i->fieldName, i->getn());
|
|
BSONObj obj = b.done();
|
|
theDataFileMgr.insert(ns, (void*) obj.objdata(), obj.objsize());
|
|
if ( profile )
|
|
ss << " fastmodinsert ";
|
|
return 3;
|
|
}
|
|
if ( profile )
|
|
ss << " upsert ";
|
|
theDataFileMgr.insert(ns, (void*) updateobj.objdata(), updateobj.objsize());
|
|
return 4;
|
|
}
|
|
return 0;
|
|
}
|
|
/* todo: we can optimize replication by just doing insert when an upsert triggers.
|
|
*/
|
|
void updateObjects(const char *ns, BSONObj updateobj, BSONObj pattern, bool upsert, stringstream& ss) {
|
|
int rc = _updateObjects(ns, updateobj, pattern, upsert, ss, true);
|
|
if ( rc != 5 )
|
|
logOp("u", ns, updateobj, &pattern, &upsert);
|
|
}
|
|
|
|
int queryTraceLevel = 0;
|
|
int otherTraceLevel = 0;
|
|
|
|
int initialExtentSize(int len);
|
|
|
|
bool _runCommands(const char *ns, BSONObj& jsobj, stringstream& ss, BufBuilder &b, BSONObjBuilder& anObjBuilder, bool fromRepl);
|
|
|
|
bool runCommands(const char *ns, BSONObj& jsobj, stringstream& ss, BufBuilder &b, BSONObjBuilder& anObjBuilder, bool fromRepl) {
|
|
try {
|
|
return _runCommands(ns, jsobj, ss, b, anObjBuilder, fromRepl);
|
|
}
|
|
catch ( AssertionException e ) {
|
|
if ( !e.msg.empty() )
|
|
anObjBuilder.append("assertion", e.msg);
|
|
}
|
|
ss << " assertion ";
|
|
anObjBuilder.append("errmsg", "db assertion failure");
|
|
anObjBuilder.append("ok", 0.0);
|
|
BSONObj x = anObjBuilder.done();
|
|
b.append((void*) x.objdata(), x.objsize());
|
|
return true;
|
|
}
|
|
|
|
int nCaught = 0;
|
|
|
|
void killCursors(int n, long long *ids) {
|
|
int k = 0;
|
|
for ( int i = 0; i < n; i++ ) {
|
|
if ( ClientCursor::erase(ids[i]) )
|
|
k++;
|
|
}
|
|
log() << "killCursors: found " << k << " of " << n << '\n';
|
|
}
|
|
|
|
BSONObj id_obj = fromjson("{\"_id\":ObjectId( \"000000000000000000000000\" )}");
|
|
BSONObj empty_obj = fromjson("{}");
|
|
|
|
/* { count: "collectionname"[, query: <query>] }
|
|
returns -1 on error.
|
|
*/
|
|
int runCount(const char *ns, BSONObj& cmd, string& err) {
|
|
NamespaceDetails *d = nsdetails(ns);
|
|
if ( d == 0 ) {
|
|
err = "ns does not exist";
|
|
return -1;
|
|
}
|
|
|
|
BSONObj query = cmd.getObjectField("query");
|
|
|
|
if ( query.isEmpty() ) {
|
|
// count of all objects
|
|
return (int) d->nrecords;
|
|
}
|
|
|
|
auto_ptr<Cursor> c;
|
|
|
|
bool simpleKeyToMatch = false;
|
|
c = getIndexCursor(ns, query, empty_obj, &simpleKeyToMatch);
|
|
|
|
if ( c.get() ) {
|
|
if ( simpleKeyToMatch ) {
|
|
/* Here we only look at the btree keys to determine if a match, instead of looking
|
|
into the records, which would be much slower.
|
|
*/
|
|
int count = 0;
|
|
BtreeCursor *bc = dynamic_cast<BtreeCursor *>(c.get());
|
|
if ( c->ok() && !query.woCompare( bc->currKeyNode().key, BSONObj(), false ) ) {
|
|
BSONObj firstMatch = bc->currKeyNode().key;
|
|
count++;
|
|
while ( c->advance() ) {
|
|
if ( !firstMatch.woEqual( bc->currKeyNode().key ) )
|
|
break;
|
|
count++;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
} else {
|
|
c = findTableScan(ns, empty_obj);
|
|
}
|
|
|
|
int count = 0;
|
|
auto_ptr<JSMatcher> matcher(new JSMatcher(query, c->indexKeyPattern()));
|
|
while ( c->ok() ) {
|
|
BSONObj js = c->current();
|
|
bool deep;
|
|
if ( !matcher->matches(js, &deep) ) {
|
|
}
|
|
else if ( !deep || !c->getsetdup(c->currLoc()) ) { // i.e., check for dups on deep items only
|
|
// got a match.
|
|
count++;
|
|
}
|
|
c->advance();
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* This is for languages whose "objects" are not well ordered (JSON is well ordered).
|
|
[ { a : ... } , { b : ... } ] -> { a : ..., b : ... }
|
|
*/
|
|
inline BSONObj transformOrderFromArrayFormat(BSONObj order) {
|
|
/* note: this is slow, but that is ok as order will have very few pieces */
|
|
BSONObjBuilder b;
|
|
char p[2] = "0";
|
|
|
|
while ( 1 ) {
|
|
BSONObj j = order.getObjectField(p);
|
|
if ( j.isEmpty() )
|
|
break;
|
|
BSONElement e = j.firstElement();
|
|
uassert("bad order array", !e.eoo());
|
|
uassert("bad order array [2]", e.isNumber());
|
|
b.append(e);
|
|
(*p)++;
|
|
uassert("too many ordering elements", *p <= '9');
|
|
}
|
|
|
|
return b.doneAndDecouple();
|
|
}
|
|
|
|
QueryResult* runQuery(Message& message, const char *ns, int ntoskip, int _ntoreturn, BSONObj jsobj,
|
|
auto_ptr< set<string> > filter, stringstream& ss, int queryOptions)
|
|
{
|
|
Timer t;
|
|
int nscanned = 0;
|
|
bool wantMore = true;
|
|
int ntoreturn = _ntoreturn;
|
|
if ( _ntoreturn < 0 ) {
|
|
ntoreturn = -_ntoreturn;
|
|
wantMore = false;
|
|
}
|
|
ss << "query " << ns << " ntoreturn:" << ntoreturn;
|
|
|
|
int n = 0;
|
|
BufBuilder b(32768);
|
|
BSONObjBuilder cmdResBuf;
|
|
long long cursorid = 0;
|
|
|
|
b.skip(sizeof(QueryResult));
|
|
|
|
/* we assume you are using findOne() for running a cmd... */
|
|
if ( ntoreturn == 1 && runCommands(ns, jsobj, ss, b, cmdResBuf, false) ) {
|
|
n = 1;
|
|
}
|
|
else {
|
|
|
|
uassert("not master", isMaster() || (queryOptions & Option_SlaveOk));
|
|
|
|
string hint;
|
|
bool explain = false;
|
|
bool _gotquery = false;
|
|
BSONObj query;// = jsobj.getObjectField("query");
|
|
{
|
|
BSONElement e = jsobj.findElement("query");
|
|
if ( !e.eoo() && (e.type() == Object || e.type() == Array) ) {
|
|
query = e.embeddedObject();
|
|
_gotquery = true;
|
|
}
|
|
}
|
|
BSONObj order;
|
|
{
|
|
BSONElement e = jsobj.findElement("orderby");
|
|
if ( !e.eoo() ) {
|
|
order = e.embeddedObjectUserCheck();
|
|
if ( e.type() == Array )
|
|
order = transformOrderFromArrayFormat(order);
|
|
}
|
|
}
|
|
if ( !_gotquery && order.isEmpty() )
|
|
query = jsobj;
|
|
else {
|
|
explain = jsobj.getBoolField("$explain");
|
|
hint = jsobj.getStringField("$hint");
|
|
}
|
|
|
|
/* The ElemIter will not be happy if this isn't really an object. So throw exception
|
|
here when that is true.
|
|
(Which may indicate bad data from appserver?)
|
|
*/
|
|
if ( query.objsize() == 0 ) {
|
|
out() << "Bad query object?\n jsobj:";
|
|
out() << jsobj.toString() << "\n query:";
|
|
out() << query.toString() << endl;
|
|
uassert("bad query object", false);
|
|
}
|
|
|
|
bool isSorted = false;
|
|
auto_ptr<Cursor> c = getSpecialCursor(ns);
|
|
|
|
if ( c.get() == 0 )
|
|
c = getIndexCursor(ns, query, order, 0, &isSorted, &hint);
|
|
if ( c.get() == 0 )
|
|
c = findTableScan(ns, order, &isSorted);
|
|
|
|
auto_ptr<JSMatcher> matcher(new JSMatcher(query, c->indexKeyPattern()));
|
|
JSMatcher &debug1 = *matcher;
|
|
assert( debug1.getN() < 1000 );
|
|
|
|
auto_ptr<ScanAndOrder> so;
|
|
bool ordering = false;
|
|
if ( !order.isEmpty() && !isSorted ) {
|
|
ordering = true;
|
|
ss << " scanAndOrder ";
|
|
so = auto_ptr<ScanAndOrder>(new ScanAndOrder(ntoskip, ntoreturn,order));
|
|
wantMore = false;
|
|
// scanAndOrder(b, c.get(), order, ntoreturn);
|
|
}
|
|
|
|
while ( c->ok() ) {
|
|
BSONObj js = c->current();
|
|
//if( queryTraceLevel >= 50 )
|
|
// out() << " checking against:\n " << js.toString() << endl;
|
|
nscanned++;
|
|
bool deep;
|
|
if ( !matcher->matches(js, &deep) ) {
|
|
}
|
|
else if ( !deep || !c->getsetdup(c->currLoc()) ) { // i.e., check for dups on deep items only
|
|
// got a match.
|
|
assert( js.objsize() >= 0 ); //defensive for segfaults
|
|
if ( ordering ) {
|
|
// note: no cursors for non-indexed, ordered results. results must be fairly small.
|
|
so->add(js);
|
|
}
|
|
else if ( ntoskip > 0 ) {
|
|
ntoskip--;
|
|
} else {
|
|
if ( explain ) {
|
|
n++;
|
|
if ( n >= ntoreturn && !wantMore )
|
|
break; // .limit() was used, show just that much.
|
|
}
|
|
else {
|
|
bool ok = fillQueryResultFromObj(b, filter.get(), js);
|
|
if ( ok ) n++;
|
|
if ( ok ) {
|
|
if ( (ntoreturn>0 && (n >= ntoreturn || b.len() > MaxBytesToReturnToClientAtOnce)) ||
|
|
(ntoreturn==0 && (b.len()>1*1024*1024 || n>=101)) ) {
|
|
/* if ntoreturn is zero, we return up to 101 objects. on the subsequent getmore, there
|
|
is only a size limit. The idea is that on a find() where one doesn't use much results,
|
|
we don't return much, but once getmore kicks in, we start pushing significant quantities.
|
|
|
|
The n limit (vs. size) is important when someone fetches only one small field from big
|
|
objects, which causes massive scanning server-side.
|
|
*/
|
|
/* if only 1 requested, no cursor saved for efficiency...we assume it is findOne() */
|
|
if ( wantMore && ntoreturn != 1 ) {
|
|
if ( useCursors ) {
|
|
c->advance();
|
|
if ( c->ok() ) {
|
|
// more...so save a cursor
|
|
ClientCursor *cc = new ClientCursor();
|
|
cc->c = c;
|
|
cursorid = cc->cursorid;
|
|
DEV out() << " query has more, cursorid: " << cursorid << endl;
|
|
//cc->pattern = query;
|
|
cc->matcher = matcher;
|
|
cc->ns = ns;
|
|
cc->pos = n;
|
|
cc->filter = filter;
|
|
cc->originalMessage = message;
|
|
cc->updateLocation();
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
c->advance();
|
|
} // end while
|
|
|
|
if ( explain ) {
|
|
BSONObjBuilder builder;
|
|
builder.append("cursor", c->toString());
|
|
builder.append("startKey", c->prettyStartKey());
|
|
builder.append("endKey", c->prettyEndKey());
|
|
builder.append("nscanned", nscanned);
|
|
builder.append("n", ordering ? so->size() : n);
|
|
if ( ordering )
|
|
builder.append("scanAndOrder", true);
|
|
builder.append("millis", t.millis());
|
|
BSONObj obj = builder.done();
|
|
fillQueryResultFromObj(b, 0, obj);
|
|
n = 1;
|
|
} else if ( ordering ) {
|
|
so->fill(b, filter.get(), n);
|
|
}
|
|
else if ( cursorid == 0 && (queryOptions & Option_CursorTailable) && c->tailable() ) {
|
|
c->setAtTail();
|
|
ClientCursor *cc = new ClientCursor();
|
|
cc->c = c;
|
|
cursorid = cc->cursorid;
|
|
DEV out() << " query has no more but tailable, cursorid: " << cursorid << endl;
|
|
//cc->pattern = query;
|
|
cc->matcher = matcher;
|
|
cc->ns = ns;
|
|
cc->pos = n;
|
|
cc->filter = filter;
|
|
cc->originalMessage = message;
|
|
cc->updateLocation();
|
|
}
|
|
}
|
|
|
|
QueryResult *qr = (QueryResult *) b.buf();
|
|
qr->resultFlags() = 0;
|
|
qr->len = b.len();
|
|
ss << " reslen:" << b.len();
|
|
// qr->channel = 0;
|
|
qr->setOperation(opReply);
|
|
qr->cursorId = cursorid;
|
|
qr->startingFrom = 0;
|
|
qr->nReturned = n;
|
|
b.decouple();
|
|
|
|
int duration = t.millis();
|
|
if ( (database && database->profile) || duration >= 100 ) {
|
|
ss << " nscanned:" << nscanned << ' ';
|
|
if ( ntoskip )
|
|
ss << " ntoskip:" << ntoskip;
|
|
if ( database && database->profile )
|
|
ss << " <br>query: ";
|
|
ss << jsobj.toString() << ' ';
|
|
}
|
|
ss << " nreturned:" << n;
|
|
return qr;
|
|
}
|
|
|
|
//int dump = 0;
|
|
|
|
/* empty result for error conditions */
|
|
QueryResult* emptyMoreResult(long long cursorid) {
|
|
BufBuilder b(32768);
|
|
b.skip(sizeof(QueryResult));
|
|
QueryResult *qr = (QueryResult *) b.buf();
|
|
qr->cursorId = 0; // 0 indicates no more data to retrieve.
|
|
qr->startingFrom = 0;
|
|
qr->len = b.len();
|
|
qr->setOperation(opReply);
|
|
qr->nReturned = 0;
|
|
b.decouple();
|
|
return qr;
|
|
}
|
|
|
|
QueryResult* getMore(const char *ns, int ntoreturn, long long cursorid) {
|
|
BufBuilder b(32768);
|
|
|
|
ClientCursor *cc = ClientCursor::find(cursorid);
|
|
|
|
b.skip(sizeof(QueryResult));
|
|
|
|
int resultFlags = 0;
|
|
int start = 0;
|
|
int n = 0;
|
|
|
|
if ( !cc ) {
|
|
DEV log() << "getMore: cursorid not found " << ns << " " << cursorid << endl;
|
|
cursorid = 0;
|
|
resultFlags = QueryResult::ResultFlag_CursorNotFound;
|
|
}
|
|
else {
|
|
start = cc->pos;
|
|
Cursor *c = cc->c.get();
|
|
c->checkLocation();
|
|
c->tailResume();
|
|
while ( 1 ) {
|
|
if ( !c->ok() ) {
|
|
if ( c->tailing() ) {
|
|
c->setAtTail();
|
|
break;
|
|
}
|
|
DEV log() << " getmore: last batch, erasing cursor " << cursorid << endl;
|
|
bool ok = ClientCursor::erase(cursorid);
|
|
assert(ok);
|
|
cursorid = 0;
|
|
cc = 0;
|
|
break;
|
|
}
|
|
BSONObj js = c->current();
|
|
|
|
bool deep;
|
|
if ( !cc->matcher->matches(js, &deep) ) {
|
|
}
|
|
else {
|
|
//out() << "matches " << c->currLoc().toString() << ' ' << deep << '\n';
|
|
if ( deep && c->getsetdup(c->currLoc()) ) {
|
|
//out() << " but it's a dup \n";
|
|
}
|
|
else {
|
|
bool ok = fillQueryResultFromObj(b, cc->filter.get(), js);
|
|
if ( ok ) {
|
|
n++;
|
|
if ( (ntoreturn>0 && (n >= ntoreturn || b.len() > MaxBytesToReturnToClientAtOnce)) ||
|
|
(ntoreturn==0 && b.len()>1*1024*1024) ) {
|
|
c->advance();
|
|
if ( c->tailing() && !c->ok() )
|
|
c->setAtTail();
|
|
cc->pos += n;
|
|
//cc->updateLocation();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
c->advance();
|
|
}
|
|
if ( cc )
|
|
cc->updateLocation();
|
|
}
|
|
|
|
QueryResult *qr = (QueryResult *) b.buf();
|
|
qr->len = b.len();
|
|
qr->setOperation(opReply);
|
|
qr->resultFlags() = resultFlags;
|
|
qr->cursorId = cursorid;
|
|
qr->startingFrom = start;
|
|
qr->nReturned = n;
|
|
b.decouple();
|
|
|
|
return qr;
|
|
}
|
|
|
|
} // namespace mongo
|