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https://github.com/mongodb/mongo.git
synced 2024-12-01 01:21:03 +01:00
662 lines
17 KiB
C++
662 lines
17 KiB
C++
// query.cpp
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#include "stdafx.h"
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#include "query.h"
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#include "pdfile.h"
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#include "jsobj.h"
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#include "../util/builder.h"
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#include <time.h>
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#include "introspect.h"
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#include "btree.h"
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#include "../util/lruishmap.h"
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//ns->query->DiskLoc
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LRUishMap<JSObj,DiskLoc,5> lrutest(123);
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int nextCursorId = 1;
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JSObj emptyObj;
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int getGtLtOp(Element& e);
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void appendElementHandlingGtLt(JSObjBuilder& b, Element& e);
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/* todo: _ cache query plans
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_ use index on partial match with the query
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parameters
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query - the query, e.g., { name: 'joe' }
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order - order by spec, e.g., { name: 1 } 1=ASC, -1=DESC
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*/
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auto_ptr<Cursor> getIndexCursor(const char *ns, JSObj& query, JSObj& order) {
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NamespaceDetails *d = nsdetails(ns);
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if( d == 0 ) return auto_ptr<Cursor>();
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// queryFields, e.g. { 'name' }
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set<string> queryFields;
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query.getFieldNames(queryFields);
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if( !order.isEmpty() ) {
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set<string> orderFields;
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order.getFieldNames(orderFields);
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// order by
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for(int i = 0; i < d->nIndexes; i++ ) {
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JSObj idxInfo = d->indexes[i].info.obj(); // { name:, ns:, key: }
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assert( strcmp(ns, idxInfo.getStringField("ns")) == 0 );
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JSObj idxKey = idxInfo.getObjectField("key");
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set<string> keyFields;
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idxKey.getFieldNames(keyFields);
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if( keyFields == orderFields ) {
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bool reverse =
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order.firstElement().type() == Number &&
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order.firstElement().number() < 0;
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JSObjBuilder b;
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/* todo: start with the right key, not just beginning of index, when query is also
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specified!
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*/
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return auto_ptr<Cursor>(new BtreeCursor(d->indexes[i].head, reverse ? maxKey : emptyObj, reverse ? -1 : 1, false));
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}
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}
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}
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// regular query without order by
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for(int i = 0; i < d->nIndexes; i++ ) {
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JSObj idxInfo = d->indexes[i].info.obj(); // { name:, ns:, key: }
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JSObj idxKey = idxInfo.getObjectField("key");
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set<string> keyFields;
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idxKey.getFieldNames(keyFields);
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if( keyFields == queryFields ) {
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JSObjBuilder b;
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JSObj q = query.extractFields(idxKey, b);
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/* regexp: only supported if form is /^text/ */
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JSObjBuilder b2;
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JSElemIter it(q);
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bool first = true;
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while( it.more() ) {
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Element e = it.next();
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if( e.eoo() )
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break;
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// GT/LT
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if( e.type() == Object ) {
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int op = getGtLtOp(e);
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if( op ) {
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if( !first || !it.next().eoo() ) {
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// compound keys with GT/LT not supported yet via index.
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goto fail;
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}
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int direction = - JSMatcher::opDirection(op);
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return auto_ptr<Cursor>( new BtreeCursor(
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d->indexes[i].head,
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direction == 1 ? emptyObj : maxKey,
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direction,
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true) );
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}
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}
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first = false;
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if( e.type() == RegEx ) {
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if( *e.regexFlags() )
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goto fail;
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const char *re = e.regex();
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const char *p = re;
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if( *p++ != '^' ) goto fail;
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while( *p ) {
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if( *p == ' ' || (*p>='0'&&*p<='9') || (*p>='@'&&*p<='Z') || (*p>='a'&&*p<='z') )
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;
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else
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goto fail;
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p++;
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}
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if( it.more() && !it.next().eoo() ) // we must be the last part of the key (for now until we are smarter)
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goto fail;
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// ok!
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b2.append(e.fieldName(), re+1);
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break;
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}
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else {
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b2.append(e);
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//appendElementHandlingGtLt(b2, e);
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}
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}
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JSObj q2 = b2.done();
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return auto_ptr<Cursor>(
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new BtreeCursor(d->indexes[i].head, q2, 1, true));
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}
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}
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fail:
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return auto_ptr<Cursor>();
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}
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void deleteObjects(const char *ns, JSObj pattern, bool justOne) {
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// cout << "delete ns:" << ns << " queryobjsize:" <<
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// pattern.objsize() << endl;
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if( strstr(ns, ".system.") ) {
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if( strstr(ns, ".system.indexes") ) {
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cout << "WARNING: delete on system namespace " << ns << endl;
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}
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else {
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cout << "ERROR: attempt to delete in system namespace " << ns << endl;
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return;
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}
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}
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JSMatcher matcher(pattern);
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JSObj order;
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auto_ptr<Cursor> c = getIndexCursor(ns, pattern, order);
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if( c.get() == 0 )
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c = theDataFileMgr.findAll(ns);
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Cursor &tempDebug = *c;
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int temp = 0;
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int tempd = 0;
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DiskLoc _tempDelLoc;
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while( c->ok() ) {
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temp++;
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Record *r = c->_current();
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DiskLoc rloc = c->currLoc();
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c->advance(); // must advance before deleting as the next ptr will die
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JSObj js(r);
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bool deep;
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if( !matcher.matches(js, &deep) ) {
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if( c->tempStopOnMiss() )
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break;
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}
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else {
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assert( !deep || !c->dup(rloc) ); // can't be a dup, we deleted it!
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// cout << " found match to delete" << endl;
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if( !justOne )
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c->noteLocation();
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_tempDelLoc = rloc;
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theDataFileMgr.deleteRecord(ns, r, rloc);
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tempd = temp;
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if( justOne )
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return;
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c->checkLocation();
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}
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}
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}
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struct Mod {
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const char *fieldName;
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double n;
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};
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void applyMods(vector<Mod>& mods, JSObj obj) {
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for( vector<Mod>::iterator i = mods.begin(); i != mods.end(); i++ ) {
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Mod& m = *i;
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Element e = obj.findElement(m.fieldName);
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if( e.type() == Number ) {
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e.number() += m.n;
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}
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}
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}
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/* get special operations like $inc
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{ $inc: { a:1, b:1 } }
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*/
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void getMods(vector<Mod>& mods, JSObj from) {
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JSElemIter it(from);
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while( it.more() ) {
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Element e = it.next();
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if( strcmp(e.fieldName(), "$inc") == 0 && e.type() == Object ) {
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JSObj j = e.embeddedObject();
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JSElemIter jt(j);
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while( jt.more() ) {
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Element f = jt.next();
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if( f.eoo() )
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break;
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Mod m;
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m.fieldName = f.fieldName();
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if( f.type() == Number ) {
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m.n = f.number();
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mods.push_back(m);
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}
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}
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}
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}
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}
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/*
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todo:
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smart requery find record immediately
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*/
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void updateObjects(const char *ns, JSObj updateobj, JSObj pattern, bool upsert) {
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//cout << "TEMP BAD";
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//lrutest.find(updateobj);
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// cout << "update ns:" << ns << " objsize:" << updateobj.objsize() << " queryobjsize:" <<
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// pattern.objsize();
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if( strstr(ns, ".system.") ) {
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cout << "\nERROR: attempt to update in system namespace " << ns << endl;
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return;
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}
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{
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JSMatcher matcher(pattern);
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JSObj order;
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auto_ptr<Cursor> c = getIndexCursor(ns, pattern, order);
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if( c.get() == 0 )
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c = theDataFileMgr.findAll(ns);
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while( c->ok() ) {
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Record *r = c->_current();
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JSObj js(r);
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if( !matcher.matches(js) ) {
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if( c->tempStopOnMiss() )
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break;
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}
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else {
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/* note: we only update one row and quit. if you do multiple later,
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be careful or multikeys in arrays could break things badly. best
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to only allow updating a single row with a multikey lookup.
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*/
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/* look for $inc etc. note as listed here, all fields to inc must be this type, you can't set some
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regular ones at the moment. */
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if( updateobj.firstElement().fieldName()[0] == '$' ) {
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vector<Mod> mods;
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getMods(mods, updateobj);
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applyMods(mods, c->currLoc().obj());
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return;
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}
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theDataFileMgr.update(ns, r, c->currLoc(), updateobj.objdata(), updateobj.objsize());
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return;
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}
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c->advance();
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}
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}
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if( upsert ) {
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if( updateobj.firstElement().fieldName()[0] == '$' ) {
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/* upsert of an $inc. build a default */
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vector<Mod> mods;
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getMods(mods, updateobj);
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JSObjBuilder b;
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b.appendElements(pattern);
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for( vector<Mod>::iterator i = mods.begin(); i != mods.end(); i++ )
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b.append(i->fieldName, i->n);
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JSObj obj = b.done();
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theDataFileMgr.insert(ns, (void*) obj.objdata(), obj.objsize());
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return;
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}
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theDataFileMgr.insert(ns, (void*) updateobj.objdata(), updateobj.objsize());
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}
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}
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int queryTraceLevel = 0;
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int otherTraceLevel = 0;
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int initialExtentSize(int len);
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void clean(const char *ns, NamespaceDetails *d) {
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// d->firstExtent.Null();
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// d->lastExtent.Null();
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for( int i = 0; i < Buckets; i++ )
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d->deletedList[i].Null();
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// d->datasize = 0; d->nrecords = 0; d->lastExtentSize = 0; d->nIndexes = 0;
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// client->newestFile()->newExtent(ns, initialExtentSize(500));
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}
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string validateNS(const char *ns, NamespaceDetails *d) {
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stringstream ss;
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ss << "validate...\n";
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try {
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auto_ptr<Cursor> c = theDataFileMgr.findAll(ns);
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int n = 0;
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long long len = 0;
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long long nlen = 0;
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while( c->ok() ) {
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n++;
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Record *r = c->_current();
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len += r->lengthWithHeaders;
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nlen += r->netLength();
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c->advance();
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}
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ss << " " << n << " objects found\n";
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ss << " " << len << " bytes record data w/headers\n";
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ss << " " << nlen << " bytes record data wout/headers\n";
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ss << " deletedList: ";
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for( int i = 0; i < Buckets; i++ ) {
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ss << (d->deletedList[i].isNull() ? '0' : '1');
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}
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ss << endl;
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int ndel = 0;
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long long delSize = 0;
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for( int i = 0; i < Buckets; i++ ) {
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DiskLoc loc = d->deletedList[i];
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while( !loc.isNull() ) {
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ndel++;
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DeletedRecord *d = loc.drec();
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delSize += d->lengthWithHeaders;
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loc = d->nextDeleted;
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}
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}
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ss << " deleted: n: " << ndel << " size: " << delSize << endl;
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}
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catch(AssertionException) {
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ss << "\n exception during validate\n" << endl;
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}
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return ss.str();
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}
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// e.g.
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// system.cmd$.find( { queryTraceLevel: 2 } );
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//
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// returns true if ran a cmd
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//
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inline bool runCommands(const char *ns, JSObj& jsobj, stringstream& ss, BufBuilder &b, JSObjBuilder& anObjBuilderForYa) {
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const char *p = strchr(ns, '.');
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if( !p ) return false;
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if( strcmp(p, ".$cmd") != 0 ) return false;
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ss << "\n $cmd: " << jsobj.toString();
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bool ok = false;
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bool valid = false;
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Element e = jsobj.firstElement();
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if( e.eoo() ) goto done;
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if( e.type() == Number ) {
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if( strncmp(ns, "admin", p-ns) != 0 ) // admin only
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return false;
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if( strcmp(e.fieldName(),"queryTraceLevel") == 0 ) {
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valid = ok = true;
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queryTraceLevel = (int) e.number();
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} else if( strcmp(e.fieldName(),"traceAll") == 0 ) {
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valid = ok = true;
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queryTraceLevel = (int) e.number();
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otherTraceLevel = (int) e.number();
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}
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}
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else if( e.type() == String ) {
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string us(ns, p-ns);
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if( strcmp( e.fieldName(), "clean") == 0 ) {
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valid = true;
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string dropNs = us + '.' + e.valuestr();
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NamespaceDetails *d = nsdetails(dropNs.c_str());
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cout << "CMD: clean " << dropNs << endl;
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if( d ) {
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ok = true;
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anObjBuilderForYa.append("ns", dropNs.c_str());
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clean(dropNs.c_str(), d);
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}
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else {
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anObjBuilderForYa.append("errmsg", "ns not found");
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}
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}
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else if( strcmp( e.fieldName(), "drop") == 0 ) {
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valid = true;
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string dropNs = us + '.' + e.valuestr();
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NamespaceDetails *d = nsdetails(dropNs.c_str());
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cout << "CMD: clean " << dropNs << endl;
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if( d ) {
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ok = true;
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anObjBuilderForYa.append("ns", dropNs.c_str());
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client->namespaceIndex->kill(dropNs.c_str());
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}
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else {
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anObjBuilderForYa.append("errmsg", "ns not found");
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}
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}
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else if( strcmp( e.fieldName(), "validate") == 0 ) {
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valid = true;
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string toValidateNs = us + '.' + e.valuestr();
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NamespaceDetails *d = nsdetails(toValidateNs.c_str());
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cout << "CMD: validate " << toValidateNs << endl;
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if( d ) {
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ok = true;
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anObjBuilderForYa.append("ns", toValidateNs.c_str());
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string s = validateNS(toValidateNs.c_str(), d);
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anObjBuilderForYa.append("result", s.c_str());
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}
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else {
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anObjBuilderForYa.append("errmsg", "ns not found");
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}
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}
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else if( strcmp(e.fieldName(),"deleteIndexes") == 0 ) {
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valid = true;
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/* note: temp implementation. space not reclaimed! */
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string toDeleteNs = us + '.' + e.valuestr();
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NamespaceDetails *d = nsdetails(toDeleteNs.c_str());
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cout << "CMD: deleteIndexes " << toDeleteNs << endl;
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if( d ) {
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ok = true;
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cout << " d->nIndexes was " << d->nIndexes << endl;
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anObjBuilderForYa.append("nIndexesWas", (double)d->nIndexes);
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cout << " temp implementation, space not reclaimed" << endl;
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d->nIndexes = 0;
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}
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else {
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anObjBuilderForYa.append("errmsg", "ns not found");
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}
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}
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}
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done:
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if( !valid )
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anObjBuilderForYa.append("errmsg", "no such cmd");
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anObjBuilderForYa.append("ok", ok?1.0:0.0);
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JSObj x = anObjBuilderForYa.done();
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b.append((void*) x.objdata(), x.objsize());
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return true;
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}
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int nCaught = 0;
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QueryResult* runQuery(const char *ns, int ntoskip, int ntoreturn, JSObj jsobj,
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auto_ptr< set<string> > filter, stringstream& ss) {
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ss << "query:" << ns << " ntoreturn:" << ntoreturn;
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if( ntoskip ) ss << " ntoskip:" << ntoskip;
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if( jsobj.objsize() > 100 )
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ss << " querysz:" << jsobj.objsize();
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if( queryTraceLevel >= 1 )
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cout << "query: " << jsobj.toString() << endl;
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int n = 0;
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BufBuilder b(32768);
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JSObjBuilder cmdResBuf;
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long long cursorid = 0;
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b.skip(sizeof(QueryResult));
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/* we assume you are using findOne() for running a cmd... */
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if( ntoreturn == 1 && runCommands(ns, jsobj, ss, b, cmdResBuf) ) {
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n = 1;
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}
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else {
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JSObj query = jsobj.getObjectField("query");
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JSObj order = jsobj.getObjectField("orderby");
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if( query.isEmpty() && order.isEmpty() )
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query = jsobj;
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auto_ptr<JSMatcher> matcher(new JSMatcher(query));
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int nscanned = 0;
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auto_ptr<Cursor> c = getSpecialCursor(ns);
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try{
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if( c.get() == 0 ) {
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c = getIndexCursor(ns, query, order);
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}
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if( c.get() == 0 ) {
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c = theDataFileMgr.findAll(ns);
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if( queryTraceLevel >= 1 )
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cout << " basiccursor" << endl;
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}
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while( c->ok() ) {
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JSObj js = c->current();
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if( queryTraceLevel >= 50 )
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cout << " checking against:\n " << js.toString() << endl;
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nscanned++;
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bool deep;
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if( !matcher->matches(js, &deep) ) {
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if( c->tempStopOnMiss() )
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break;
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|
}
|
|
else if( !deep || !c->dup(c->currLoc()) ) { // i.e., check for dups on deep items only
|
|
// got a match.
|
|
if( ntoskip > 0 ) {
|
|
ntoskip--;
|
|
}
|
|
else {
|
|
bool ok = true;
|
|
if( filter.get() ) {
|
|
// we just want certain fields from the object.
|
|
JSObj x;
|
|
ok = x.addFields(js, *filter) > 0;
|
|
if( ok )
|
|
b.append((void*) x.objdata(), x.objsize());
|
|
}
|
|
else {
|
|
b.append((void*) js.objdata(), js.objsize());
|
|
}
|
|
if( ok ) {
|
|
n++;
|
|
if( (ntoreturn>0 && (n >= ntoreturn || b.len() > 16*1024*1024)) ||
|
|
(ntoreturn==0 && b.len()>1*1024*1024) ) {
|
|
// more...so save a cursor
|
|
ClientCursor *cc = new ClientCursor();
|
|
cc->c = c;
|
|
cursorid = allocCursorId();
|
|
cc->cursorid = cursorid;
|
|
cc->matcher = matcher;
|
|
cc->ns = ns;
|
|
cc->pos = n;
|
|
ClientCursor::add(cc);
|
|
cc->updateLocation();
|
|
cc->filter = filter;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
c->advance();
|
|
}
|
|
|
|
if( queryTraceLevel >=2 )
|
|
cout << " nscanned:" << nscanned << "\n ";
|
|
}
|
|
catch( AssertionException e ) {
|
|
if( n )
|
|
throw e;
|
|
if( nCaught++ >= 100 ) {
|
|
cout << "Too many query exceptions, terminating" << endl;
|
|
exit(-8);
|
|
}
|
|
cout << " Assertion running query, returning an empty result" << endl;
|
|
}
|
|
}
|
|
|
|
QueryResult *qr = (QueryResult *) b.buf();
|
|
qr->_data[0] = 0;
|
|
qr->_data[1] = 0;
|
|
qr->_data[2] = 0;
|
|
qr->_data[3] = 0;
|
|
qr->len = b.len();
|
|
ss << " resLen:" << b.len();
|
|
// qr->channel = 0;
|
|
qr->operation = opReply;
|
|
qr->cursorId = cursorid;
|
|
qr->startingFrom = 0;
|
|
qr->nReturned = n;
|
|
b.decouple();
|
|
|
|
ss << " nReturned:" << n;
|
|
return qr;
|
|
}
|
|
|
|
QueryResult* getMore(const char *ns, int ntoreturn, long long cursorid) {
|
|
|
|
// cout << "getMore ns:" << ns << " ntoreturn:" << ntoreturn << " cursorid:" <<
|
|
// cursorid << endl;
|
|
|
|
BufBuilder b(32768);
|
|
|
|
ClientCursor *cc = 0;
|
|
CCMap::iterator it = clientCursors.find(cursorid);
|
|
if( it == clientCursors.end() ) {
|
|
cout << "Cursor not found in map. cursorid: " << cursorid << endl;
|
|
}
|
|
else {
|
|
cc = it->second;
|
|
}
|
|
|
|
b.skip(sizeof(QueryResult));
|
|
|
|
int start = 0;
|
|
int n = 0;
|
|
|
|
if( cc ) {
|
|
start = cc->pos;
|
|
Cursor *c = cc->c.get();
|
|
while( 1 ) {
|
|
if( !c->ok() ) {
|
|
done:
|
|
// done! kill cursor.
|
|
cursorid = 0;
|
|
clientCursors.erase(it);
|
|
delete cc;
|
|
cc = 0;
|
|
break;
|
|
}
|
|
JSObj js = c->current();
|
|
bool deep;
|
|
if( !cc->matcher->matches(js, &deep) ) {
|
|
if( c->tempStopOnMiss() )
|
|
goto done;
|
|
}
|
|
else if( !deep || !c->dup(c->currLoc()) ) {
|
|
bool ok = true;
|
|
if( cc->filter.get() ) {
|
|
JSObj x;
|
|
ok = x.addFields(js, *cc->filter) > 0;
|
|
if( ok )
|
|
b.append((void*) x.objdata(), x.objsize());
|
|
}
|
|
else {
|
|
b.append((void*) js.objdata(), js.objsize());
|
|
}
|
|
if( ok ) {
|
|
n++;
|
|
if( (ntoreturn>0 && (n >= ntoreturn || b.len() > 16*1024*1024)) ||
|
|
(ntoreturn==0 && b.len()>1*1024*1024) ) {
|
|
cc->pos += n;
|
|
cc->updateLocation();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
c->advance();
|
|
}
|
|
}
|
|
|
|
QueryResult *qr = (QueryResult *) b.buf();
|
|
qr->cursorId = cursorid;
|
|
qr->startingFrom = start;
|
|
qr->len = b.len();
|
|
// qr->reserved = 0;
|
|
qr->operation = opReply;
|
|
qr->nReturned = n;
|
|
b.decouple();
|
|
|
|
return qr;
|
|
}
|