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/**
* Copyright (C) 2019-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.
*/
#pragma once
#include <fmt/format.h>
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/ops/write_ops_gen.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/write_concern.h"
#include "mongo/rpc/get_status_from_command_result.h"
namespace mongo {
using namespace fmt::literals;
namespace WriteConcerns {
const WriteConcernOptions kMajorityWriteConcern{WriteConcernOptions::kMajority,
WriteConcernOptions::SyncMode::UNSET,
WriteConcernOptions::kWriteConcernTimeoutSharding};
}
template <typename T>
class PersistentTaskStore {
public:
PersistentTaskStore(NamespaceString storageNss) : _storageNss(std::move(storageNss)) {}
/**
* Adds a task to the store.
*/
void add(OperationContext* opCtx,
const T& task,
const WriteConcernOptions& writeConcern = WriteConcerns::kMajorityWriteConcern) {
DBDirectClient dbClient(opCtx);
const auto commandResponse = dbClient.runCommand([&] {
write_ops::Insert insertOp(_storageNss);
insertOp.setDocuments({task.toBSON()});
return insertOp.serialize({});
}());
const auto commandReply = commandResponse->getCommandReply();
uassertStatusOK(getStatusFromWriteCommandReply(commandReply));
WriteConcernResult ignoreResult;
auto latestOpTime = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
uassertStatusOK(waitForWriteConcern(opCtx, latestOpTime, writeConcern, &ignoreResult));
}
/**
* Updates a document that matches the given query using the update modifier specified. Even if
* multiple documents match, at most one document will be updated.
*/
void update(OperationContext* opCtx,
Query query,
const BSONObj& update,
const WriteConcernOptions& writeConcern = WriteConcerns::kMajorityWriteConcern) {
_update(opCtx, std::move(query), update, /* upsert */ false, writeConcern);
}
/**
* Upserts a document that matches the given query using the update modifier specified. Even if
* multiple documents match, at most one document will be updated.
*/
void upsert(OperationContext* opCtx,
Query query,
const BSONObj& update,
const WriteConcernOptions& writeConcern = WriteConcerns::kMajorityWriteConcern) {
_update(opCtx, std::move(query), update, /* upsert */ true, writeConcern);
}
/**
* Removes all documents which match the given query.
*/
void remove(OperationContext* opCtx,
Query query,
const WriteConcernOptions& writeConcern = WriteConcerns::kMajorityWriteConcern) {
DBDirectClient dbClient(opCtx);
auto commandResponse = dbClient.runCommand([&] {
write_ops::Delete deleteOp(_storageNss);
deleteOp.setDeletes({[&] {
write_ops::DeleteOpEntry entry;
entry.setQ(query.obj);
entry.setMulti(true);
return entry;
}()});
return deleteOp.serialize({});
}());
const auto commandReply = commandResponse->getCommandReply();
uassertStatusOK(getStatusFromWriteCommandReply(commandReply));
WriteConcernResult ignoreResult;
auto latestOpTime = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
uassertStatusOK(waitForWriteConcern(opCtx, latestOpTime, writeConcern, &ignoreResult));
}
/**
* Executes the specified query on the collection and calls the callback for each element.
* Iteration can be stopped early if the callback returns false indicating that it doesn't want
* to continue.
*/
void forEach(OperationContext* opCtx, Query query, std::function<bool(const T&)> handler) {
DBDirectClient dbClient(opCtx);
auto cursor = dbClient.query(_storageNss, query);
while (cursor->more()) {
auto bson = cursor->next();
auto t = T::parse(
IDLParserErrorContext("PersistentTaskStore:" + _storageNss.toString()), bson);
if (bool shouldContinue = handler(t); !shouldContinue)
return;
}
}
/**
* Returns the number of documents in the store matching the given query.
*/
size_t count(OperationContext* opCtx, Query query = Query()) {
DBDirectClient client(opCtx);
auto projection = BSON("_id" << 1);
auto cursor = client.query(_storageNss, query, 0, 0, &projection);
return cursor->itcount();
}
private:
void _update(OperationContext* opCtx,
Query query,
const BSONObj& update,
bool upsert,
const WriteConcernOptions& writeConcern = WriteConcerns::kMajorityWriteConcern) {
DBDirectClient dbClient(opCtx);
auto commandResponse = dbClient.runCommand([&] {
write_ops::Update updateOp(_storageNss);
auto updateModification = write_ops::UpdateModification::parseFromClassicUpdate(update);
write_ops::UpdateOpEntry updateEntry(query.obj, updateModification);
updateEntry.setMulti(false);
updateEntry.setUpsert(upsert);
updateOp.setUpdates({updateEntry});
return updateOp.serialize({});
}());
const auto commandReply = commandResponse->getCommandReply();
uassertStatusOK(getStatusFromWriteCommandReply(commandReply));
uassert(ErrorCodes::NoMatchingDocument,
"No matching document found for query {} on namespace {}"_format(
query.toString(), _storageNss.toString()),
upsert || commandReply.getIntField("n") > 0);
WriteConcernResult ignoreResult;
auto latestOpTime = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
uassertStatusOK(waitForWriteConcern(opCtx, latestOpTime, writeConcern, &ignoreResult));
}
NamespaceString _storageNss;
};
} // namespace mongo
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