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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/protocol.h"
#include <algorithm>
#include <iterator>
#include "mongo/base/string_data.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/wire_version.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace rpc {
namespace {
/**
* Protocols supported by order of preference.
*/
const Protocol kPreferredProtos[] = {Protocol::kOpCommandV1, Protocol::kOpQuery};
const char kNone[] = "none";
const char kOpQueryOnly[] = "opQueryOnly";
const char kOpCommandOnly[] = "opCommandOnly";
const char kAll[] = "all";
const OperationContext::Decoration<Protocol> operationProtocolDecoration =
OperationContext::declareDecoration<Protocol>();
} // namespace
Protocol getOperationProtocol(OperationContext* txn) {
return operationProtocolDecoration(txn);
}
void setOperationProtocol(OperationContext* txn, Protocol protocol) {
operationProtocolDecoration(txn) = protocol;
}
StatusWith<Protocol> negotiate(ProtocolSet fst, ProtocolSet snd) {
using std::begin;
using std::end;
ProtocolSet common = fst & snd;
auto it = std::find_if(begin(kPreferredProtos),
end(kPreferredProtos),
[common](Protocol p) { return common & static_cast<ProtocolSet>(p); });
if (it == end(kPreferredProtos)) {
return Status(ErrorCodes::RPCProtocolNegotiationFailed, "No common protocol found.");
}
return *it;
}
StatusWith<StringData> toString(ProtocolSet protocols) {
switch (protocols) {
case supports::kNone:
return StringData(kNone);
case supports::kOpQueryOnly:
return StringData(kOpQueryOnly);
case supports::kOpCommandOnly:
return StringData(kOpCommandOnly);
case supports::kAll:
return StringData(kAll);
default:
return Status(ErrorCodes::BadValue,
str::stream() << "Can not convert ProtocolSet " << protocols
<< " to a string, only the predefined ProtocolSet "
<< "constants 'none' (0x0), 'opQueryOnly' (0x1), "
<< "'opCommandOnly' (0x2), and 'all' (0x3) are supported.");
}
}
StatusWith<ProtocolSet> parseProtocolSet(StringData repr) {
if (repr == kNone) {
return supports::kNone;
} else if (repr == kOpQueryOnly) {
return supports::kOpQueryOnly;
} else if (repr == kOpCommandOnly) {
return supports::kOpCommandOnly;
} else if (repr == kAll) {
return supports::kAll;
}
return Status(ErrorCodes::BadValue,
str::stream() << "Can not parse a ProtocolSet from " << repr
<< " only the predefined ProtocolSet constants "
<< "'none' (0x0), 'opQueryOnly' (0x1), 'opCommandOnly' (0x2), "
<< "and 'all' (0x3) are supported.");
}
StatusWith<ProtocolSet> parseProtocolSetFromIsMasterReply(const BSONObj& isMasterReply) {
long long maxWireVersion;
auto maxWireExtractStatus =
bsonExtractIntegerField(isMasterReply, "maxWireVersion", &maxWireVersion);
long long minWireVersion;
auto minWireExtractStatus =
bsonExtractIntegerField(isMasterReply, "minWireVersion", &minWireVersion);
// MongoDB 2.4 and earlier do not have maxWireVersion/minWireVersion in their 'isMaster' replies
if ((maxWireExtractStatus == minWireExtractStatus) &&
(maxWireExtractStatus == ErrorCodes::NoSuchKey)) {
return supports::kOpQueryOnly;
} else if (!maxWireExtractStatus.isOK()) {
return maxWireExtractStatus;
} else if (!minWireExtractStatus.isOK()) {
return minWireExtractStatus;
}
bool isMongos = false;
std::string msgField;
auto msgFieldExtractStatus = bsonExtractStringField(isMasterReply, "msg", &msgField);
if (msgFieldExtractStatus == ErrorCodes::NoSuchKey) {
isMongos = false;
} else if (!msgFieldExtractStatus.isOK()) {
return msgFieldExtractStatus;
} else {
isMongos = (msgField == "isdbgrid");
}
return (!isMongos && supportsWireVersionForOpCommandInMongod(minWireVersion, maxWireVersion))
? supports::kAll
: supports::kOpQueryOnly;
}
bool supportsWireVersionForOpCommandInMongod(int minWireVersion, int maxWireVersion) {
// FIND_COMMAND versions support OP_COMMAND (in mongod but not mongos).
return (minWireVersion <= WireVersion::FIND_COMMAND) &&
(maxWireVersion >= WireVersion::FIND_COMMAND);
}
ProtocolSet computeProtocolSet(int minWireVersion, int maxWireVersion) {
ProtocolSet result = supports::kNone;
if (minWireVersion <= maxWireVersion) {
if (maxWireVersion >= WireVersion::FIND_COMMAND) {
result |= supports::kOpCommandOnly;
}
if (minWireVersion <= WireVersion::RELEASE_2_4_AND_BEFORE) {
result |= supports::kOpQueryOnly;
}
}
return result;
}
} // namespace rpc
} // namespace mongo
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