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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/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";
} // namespace
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.");
}
} // namespace rpc
} // namespace mongo
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