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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include <map>
#include <string>
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_catalog_entry.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/log.h"
#include "mongo/util/md5.hpp"
#include "mongo/util/timer.h"
namespace mongo {
namespace {
class DBHashCmd : public ErrmsgCommandDeprecated {
public:
DBHashCmd() : ErrmsgCommandDeprecated("dbHash", "dbhash") {}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual bool slaveOk() const {
return true;
}
virtual void 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));
}
virtual bool errmsgRun(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
std::string& errmsg,
BSONObjBuilder& result) {
Timer timer;
std::set<std::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());
}
}
const std::string ns = parseNs(dbname, cmdObj);
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Invalid db name: " << ns,
NamespaceString::validDBName(ns, NamespaceString::DollarInDbNameBehavior::Allow));
// We lock the entire database in S-mode in order to ensure that the contents will not
// change for the snapshot.
AutoGetDb autoDb(opCtx, ns, MODE_S);
Database* db = autoDb.getDb();
std::list<std::string> colls;
if (db) {
db->getDatabaseCatalogEntry()->getCollectionNamespaces(&colls);
colls.sort();
}
result.append("host", prettyHostName());
md5_state_t globalState;
md5_init(&globalState);
// A set of 'system' collections that are replicated, and therefore included in the db hash.
const std::set<StringData> replicatedSystemCollections{"system.backup_users",
"system.js",
"system.new_users",
"system.roles",
"system.users",
"system.version",
"system.views"};
BSONObjBuilder bb(result.subobjStart("collections"));
for (const auto& collectionName : colls) {
NamespaceString collNss(collectionName);
if (collNss.size() - 1 <= dbname.size()) {
errmsg = str::stream() << "weird fullCollectionName [" << collNss.toString() << "]";
return false;
}
// Only include 'system' collections that are replicated.
bool isReplicatedSystemColl =
(replicatedSystemCollections.count(collNss.coll().toString()) > 0);
if (collNss.isSystem() && !isReplicatedSystemColl)
continue;
if (desiredCollections.size() > 0 &&
desiredCollections.count(collNss.coll().toString()) == 0)
continue;
// Don't include 'drop pending' collections.
if (collNss.isDropPendingNamespace())
continue;
// Compute the hash for this collection.
std::string hash = _hashCollection(opCtx, db, collNss.toString());
bb.append(collNss.coll(), hash);
md5_append(&globalState, (const md5_byte_t*)hash.c_str(), hash.size());
}
bb.done();
md5digest d;
md5_finish(&globalState, d);
std::string hash = digestToString(d);
result.append("md5", hash);
result.appendNumber("timeMillis", timer.millis());
return 1;
}
private:
std::string _hashCollection(OperationContext* opCtx,
Database* db,
const std::string& fullCollectionName) {
NamespaceString ns(fullCollectionName);
Collection* collection = db->getCollection(opCtx, ns);
if (!collection)
return "";
IndexDescriptor* desc = collection->getIndexCatalog()->findIdIndex(opCtx);
std::unique_ptr<PlanExecutor, PlanExecutor::Deleter> exec;
if (desc) {
exec = InternalPlanner::indexScan(opCtx,
collection,
desc,
BSONObj(),
BSONObj(),
BoundInclusion::kIncludeStartKeyOnly,
PlanExecutor::NO_YIELD,
InternalPlanner::FORWARD,
InternalPlanner::IXSCAN_FETCH);
} else if (collection->isCapped()) {
exec = InternalPlanner::collectionScan(
opCtx, fullCollectionName, collection, PlanExecutor::NO_YIELD);
} else {
log() << "can't find _id index for: " << fullCollectionName;
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;
uasserted(34371,
"Plan executor error while running dbHash command: " +
WorkingSetCommon::toStatusString(c));
}
md5digest d;
md5_finish(&st, d);
std::string hash = digestToString(d);
return hash;
}
} dbhashCmd;
} // namespace
} // namespace mongo
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