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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_validation.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/db/storage/durable_catalog.h"
#include "mongo/db/storage/record_store.h"
#include "mongo/db/views/view_catalog.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::endl;
using std::string;
using std::stringstream;
// Sets the 'valid' result field to false and returns immediately.
MONGO_FAIL_POINT_DEFINE(validateCmdCollectionNotValid);
namespace {
// Protects the state below.
stdx::mutex _validationMutex;
// Holds the set of full `databaseName.collectionName` namespace strings in progress. Validation
// commands register themselves in this data structure so that subsequent commands on the same
// namespace will wait rather than run in parallel.
std::set<std::string> _validationsInProgress;
// This is waited upon if there is found to already be a validation command running on the targeted
// namespace, as _validationsInProgress would indicate. This is signaled when a validation command
// finishes on any namespace.
stdx::condition_variable _validationNotifier;
} // namespace
/**
* Example validate command:
* {
* validate: "collectionNameWithoutTheDBPart",
* full: <bool> // If true, a more thorough (and slower) collection validation is performed.
* }
*/
class ValidateCmd : public BasicCommand {
public:
ValidateCmd() : BasicCommand("validate") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
std::string help() const override {
return "Validate contents of a namespace by scanning its data structures for correctness. "
"Slow.\n"
"Add full:true option to do a more thorough check";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
bool allowsAfterClusterTime(const BSONObj& cmd) const override {
return false;
}
bool canIgnorePrepareConflicts() const override {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) const {
ActionSet actions;
actions.addAction(ActionType::validate);
out->push_back(Privilege(parseResourcePattern(dbname, cmdObj), actions));
}
bool run(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) {
if (MONGO_FAIL_POINT(validateCmdCollectionNotValid)) {
result.appendBool("valid", false);
return true;
}
const NamespaceString nss(CommandHelpers::parseNsCollectionRequired(dbname, cmdObj));
const bool full = cmdObj["full"].trueValue();
ValidateCmdLevel level = kValidateNormal;
if (full) {
level = kValidateFull;
}
if (!serverGlobalParams.quiet.load()) {
LOG(0) << "CMD: validate " << nss.ns();
}
AutoGetDb autoDB(opCtx, nss.db(), MODE_IX);
Lock::CollectionLock collLock(opCtx, nss, MODE_X);
Collection* collection =
autoDB.getDb() ? autoDB.getDb()->getCollection(opCtx, nss) : nullptr;
if (!collection) {
if (autoDB.getDb() && ViewCatalog::get(autoDB.getDb())->lookup(opCtx, nss.ns())) {
uasserted(ErrorCodes::CommandNotSupportedOnView, "Cannot validate a view");
}
uasserted(ErrorCodes::NamespaceNotFound, "ns not found");
}
result.append("ns", nss.ns());
// Only one validation per collection can be in progress, the rest wait.
{
stdx::unique_lock<stdx::mutex> lock(_validationMutex);
try {
while (_validationsInProgress.find(nss.ns()) != _validationsInProgress.end()) {
opCtx->waitForConditionOrInterrupt(_validationNotifier, lock);
}
} catch (AssertionException& e) {
CommandHelpers::appendCommandStatusNoThrow(
result,
{ErrorCodes::CommandFailed,
str::stream() << "Exception thrown during validation: " << e.toString()});
return false;
}
_validationsInProgress.insert(nss.ns());
}
ON_BLOCK_EXIT([&] {
stdx::lock_guard<stdx::mutex> lock(_validationMutex);
_validationsInProgress.erase(nss.ns());
_validationNotifier.notify_all();
});
// TODO (SERVER-30357): Add support for background validation.
const bool background = false;
ValidateResults results;
Status status =
CollectionValidation::validate(opCtx, collection, level, background, &results, &result);
if (!status.isOK()) {
return CommandHelpers::appendCommandStatusNoThrow(result, status);
}
CollectionOptions opts =
DurableCatalog::get(opCtx)->getCollectionOptions(opCtx, collection->ns());
// All collections must have a UUID.
if (!opts.uuid) {
results.errors.push_back(str::stream() << "UUID missing on collection " << nss.ns());
results.valid = false;
}
if (!full) {
results.warnings.push_back(
"Some checks omitted for speed. use {full:true} option to do more thorough scan.");
}
result.appendBool("valid", results.valid);
result.append("warnings", results.warnings);
result.append("errors", results.errors);
result.append("extraIndexEntries", results.extraIndexEntries);
result.append("missingIndexEntries", results.missingIndexEntries);
if (!results.valid) {
result.append("advice",
"A corrupt namespace has been detected. See "
"http://dochub.mongodb.org/core/data-recovery for recovery steps.");
}
return true;
}
} validateCmd;
}
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