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/**
* Copyright (C) 2015 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/platform/basic.h"
#include "mongo/rpc/command_request.h"
#include <string>
#include <utility>
#include "mongo/base/data_range_cursor.h"
#include "mongo/base/data_type.h"
#include "mongo/base/data_type_terminated.h"
#include "mongo/base/data_type_validated.h"
#include "mongo/bson/simple_bsonobj_comparator.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/jsobj.h"
#include "mongo/rpc/object_check.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/net/message.h"
namespace mongo {
namespace rpc {
namespace {
// None of these include null byte
const std::size_t kMinCommandNameLength = 1;
const std::size_t kMaxCommandNameLength = 128;
} // namespace
ParsedOpCommand ParsedOpCommand::parse(const Message& message) {
ParsedOpCommand out;
char* begin = message.singleData().data();
std::size_t length = message.singleData().dataLen();
// checked in message_port.cpp
invariant(length <= MaxMessageSizeBytes);
const char* messageEnd = begin + length;
ConstDataRangeCursor cur(begin, messageEnd);
Terminated<'\0', StringData> str;
uassertStatusOK(cur.readAndAdvance<>(&str));
out.database = str.value.toString();
uassertStatusOK(cur.readAndAdvance<>(&str));
const auto commandName = std::move(str.value);
uassert(28637,
str::stream() << "Command name parsed in OP_COMMAND message must be between "
<< kMinCommandNameLength
<< " and "
<< kMaxCommandNameLength
<< " bytes. Got: "
<< out.database,
(commandName.size() >= kMinCommandNameLength) &&
(commandName.size() <= kMaxCommandNameLength));
Validated<BSONObj> obj;
uassertStatusOK(cur.readAndAdvance<>(&obj));
out.body = std::move(obj.val);
uassert(39950,
str::stream() << "Command name parsed in OP_COMMAND message '" << commandName
<< "' doesn't match command name from object '"
<< out.body.firstElementFieldName()
<< '\'',
out.body.firstElementFieldName() == commandName);
uassertStatusOK(cur.readAndAdvance<>(&obj));
out.metadata = std::move(obj.val);
uassert(40419, "OP_COMMAND request contains trailing bytes following metadata", cur.empty());
return out;
}
OpMsgRequest opMsgRequestFromCommandRequest(const Message& message) {
auto parsed = ParsedOpCommand::parse(message);
BSONObjBuilder bodyBuilder(std::move(parsed.body));
// OP_COMMAND is only used when communicating with 3.4 nodes and they serialize their metadata
// fields differently. We do all up-conversion here so that the rest of the code only has to
// deal with the current format.
for (auto elem : parsed.metadata) {
if (elem.fieldNameStringData() == "configsvr") {
bodyBuilder.appendAs(elem, "$configServerState");
} else if (elem.fieldNameStringData() == "$ssm") {
auto ssmObj = elem.Obj();
if (auto readPrefElem = ssmObj["$readPreference"]) {
// Promote the read preference to the top level.
bodyBuilder.append(readPrefElem);
} else if (ssmObj["$secondaryOk"].trueValue()) {
// Convert secondaryOk to equivalent read preference if none was explicitly
// provided.
ReadPreferenceSetting(ReadPreference::SecondaryPreferred)
.toContainingBSON(&bodyBuilder);
}
} else {
bodyBuilder.append(elem);
}
}
bodyBuilder.append("$db", parsed.database);
OpMsgRequest request;
request.body = bodyBuilder.obj();
return request;
}
} // namespace rpc
} // namespace mongo
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