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// dbhash.cpp
/**
* Copyright (C) 2013-2014 MongoDB 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/commands/dbhash.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_catalog_entry.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/util/md5.hpp"
#include "mongo/util/timer.h"
namespace mongo {
DBHashCmd dbhashCmd;
void logOpForDbHash(const char* ns) {
dbhashCmd.wipeCacheForCollection( ns );
}
// ----
DBHashCmd::DBHashCmd()
: Command( "dbHash", false, "dbhash" ),
_cachedHashedMutex( "_cachedHashedMutex" ){
}
void DBHashCmd::addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::dbHash);
out->push_back(Privilege(ResourcePattern::forDatabaseName(dbname), actions));
}
string DBHashCmd::hashCollection( OperationContext* opCtx, Database* db, const string& fullCollectionName, bool* fromCache ) {
scoped_ptr<scoped_lock> cachedHashedLock;
if ( isCachable( fullCollectionName ) ) {
cachedHashedLock.reset( new scoped_lock( _cachedHashedMutex ) );
string hash = _cachedHashed[fullCollectionName];
if ( hash.size() > 0 ) {
*fromCache = true;
return hash;
}
}
*fromCache = false;
Collection* collection = db->getCollection( opCtx, fullCollectionName );
if ( !collection )
return "";
IndexDescriptor* desc = collection->getIndexCatalog()->findIdIndex();
auto_ptr<PlanExecutor> exec;
if ( desc ) {
exec.reset(InternalPlanner::indexScan(opCtx,
collection,
desc,
BSONObj(),
BSONObj(),
false,
InternalPlanner::FORWARD,
InternalPlanner::IXSCAN_FETCH));
}
else if ( collection->isCapped() ) {
exec.reset(InternalPlanner::collectionScan(opCtx,
fullCollectionName,
collection));
}
else {
log() << "can't find _id index for: " << fullCollectionName << endl;
return "no _id _index";
}
md5_state_t st;
md5_init(&st);
long long n = 0;
PlanExecutor::ExecState state;
BSONObj c;
verify(NULL != exec.get());
while (PlanExecutor::ADVANCED == (state = exec->getNext(&c, NULL))) {
md5_append( &st , (const md5_byte_t*)c.objdata() , c.objsize() );
n++;
}
if (PlanExecutor::IS_EOF != state) {
warning() << "error while hashing, db dropped? ns=" << fullCollectionName << endl;
}
md5digest d;
md5_finish(&st, d);
string hash = digestToString( d );
if ( cachedHashedLock.get() ) {
_cachedHashed[fullCollectionName] = hash;
}
return hash;
}
bool DBHashCmd::run(OperationContext* txn, const string& dbname , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
Timer timer;
set<string> desiredCollections;
if ( cmdObj["collections"].type() == Array ) {
BSONObjIterator i( cmdObj["collections"].Obj() );
while ( i.more() ) {
BSONElement e = i.next();
if ( e.type() != String ) {
errmsg = "collections entries have to be strings";
return false;
}
desiredCollections.insert( e.String() );
}
}
list<string> colls;
const string ns = parseNs(dbname, cmdObj);
Client::ReadContext ctx(txn, ns);
Database* db = ctx.ctx().db();
if ( db )
db->getDatabaseCatalogEntry()->getCollectionNamespaces( &colls );
colls.sort();
result.appendNumber( "numCollections" , (long long)colls.size() );
result.append( "host" , prettyHostName() );
md5_state_t globalState;
md5_init(&globalState);
vector<string> cached;
BSONObjBuilder bb( result.subobjStart( "collections" ) );
for ( list<string>::iterator i=colls.begin(); i != colls.end(); i++ ) {
string fullCollectionName = *i;
if ( fullCollectionName.size() -1 <= dbname.size() ) {
errmsg = str::stream() << "weird fullCollectionName [" << fullCollectionName << "]";
return false;
}
string shortCollectionName = fullCollectionName.substr( dbname.size() + 1 );
if ( shortCollectionName.find( "system." ) == 0 )
continue;
if ( desiredCollections.size() > 0 &&
desiredCollections.count( shortCollectionName ) == 0 )
continue;
bool fromCache = false;
string hash = hashCollection( txn, db, fullCollectionName, &fromCache );
bb.append( shortCollectionName, hash );
md5_append( &globalState , (const md5_byte_t*)hash.c_str() , hash.size() );
if ( fromCache )
cached.push_back( fullCollectionName );
}
bb.done();
md5digest d;
md5_finish(&globalState, d);
string hash = digestToString( d );
result.append( "md5" , hash );
result.appendNumber( "timeMillis", timer.millis() );
result.append( "fromCache", cached );
return 1;
}
void DBHashCmd::wipeCacheForCollection( const StringData& ns ) {
if ( !isCachable( ns ) )
return;
scoped_lock lk( _cachedHashedMutex );
_cachedHashed.erase( ns.toString() );
}
bool DBHashCmd::isCachable( const StringData& ns ) const {
return ns.startsWith( "config." );
}
}
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