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/**
* Copyright (C) 2013 10gen 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/>.
*/
#include "mongo/db/commands/write_commands/write_commands.h"
#include "mongo/base/init.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/write_commands/batch_executor.h"
#include "mongo/db/json.h"
#include "mongo/db/server_parameters.h"
#include "mongo/db/stats/counters.h"
namespace mongo {
namespace {
// Write commands are only registered if the following ServerParameter is set.
MONGO_EXPORT_STARTUP_SERVER_PARAMETER(enableExperimentalWriteCommands, bool, false);
MONGO_INITIALIZER(RegisterWriteCommands)(InitializerContext* context) {
if (enableExperimentalWriteCommands) {
// Leaked intentionally: a Command registers itself when constructed.
new CmdInsert();
new CmdUpdate();
new CmdDelete();
}
return Status::OK();
}
} // namespace
WriteCmd::WriteCmd(const StringData& name, WriteBatch::WriteType writeType, ActionType action)
: Command(name)
, _action(action)
, _writeType(writeType) {}
// Write commands are fanned out in oplog as single writes.
bool WriteCmd::logTheOp() { return false; }
// Slaves can't perform writes.
bool WriteCmd::slaveOk() const { return false; }
// Write commands acquire write lock, but not for entire length of execution.
Command::LockType WriteCmd::locktype() const { return NONE; }
void WriteCmd::addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(_action);
out->push_back(Privilege(parseNs(dbname, cmdObj), actions));
}
// Write commands are counted towards their corresponding opcounters, not command opcounters.
bool WriteCmd::shouldAffectCommandCounter() const { return false; }
bool WriteCmd::run(const string& dbName,
BSONObj& cmdObj,
int options,
string& errMsg,
BSONObjBuilder& result,
bool fromRepl) {
verify(!fromRepl); // Can't be run on secondaries (logTheOp() == false, slaveOk() == false).
if (cmdObj.firstElementType() != mongo::String) {
errMsg = "expected string type for collection name";
return false;
}
string ns = parseNs(dbName, cmdObj);
if (!NamespaceString(ns).isValid()) {
errMsg = mongoutils::str::stream() << "invalid namespace: \"" << ns << "\"";
return false;
}
{
// Commands with locktype == NONE need to acquire a Context in order to set
// CurOp::_ns. Setting a CurOp's namespace is necessary for higher-level
// functionality (e.g. profiling) to operate on the correct database (note that
// WriteBatchExecutor doesn't do this for us, since its job is to create child CurOp
// objects and operate on them).
//
// Acquire ReadContext momentarily, for satisfying this purpose.
Client::ReadContext ctx(dbName + ".$cmd");
}
WriteBatch writeBatch(ns, _writeType);
if (!writeBatch.parse(cmdObj, &errMsg)) {
return false;
}
WriteBatchExecutor writeBatchExecutor(&cc(), &globalOpCounters, lastError.get());
return writeBatchExecutor.executeBatch(writeBatch, &errMsg, &result);
}
CmdInsert::CmdInsert() : WriteCmd("insert", WriteBatch::WRITE_INSERT, ActionType::insert) {}
void CmdInsert::help(stringstream& help) const { help << "insert documents"; }
CmdUpdate::CmdUpdate() : WriteCmd("update", WriteBatch::WRITE_UPDATE, ActionType::update) {}
void CmdUpdate::help(stringstream& help) const { help << "update documents"; }
CmdDelete::CmdDelete() : WriteCmd("delete", WriteBatch::WRITE_DELETE, ActionType::remove) {}
void CmdDelete::help(stringstream& help) const { help << "delete documents"; }
} // namespace mongo
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