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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/s/client/sharding_network_connection_hook.h"
#include "mongo/base/status.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/server_options.h"
#include "mongo/db/wire_version.h"
#include "mongo/executor/remote_command_request.h"
#include "mongo/executor/remote_command_response.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/set_shard_version_request.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
Status ShardingNetworkConnectionHook::validateHost(
const HostAndPort& remoteHost, const executor::RemoteCommandResponse& isMasterReply) {
return validateHostImpl(remoteHost, isMasterReply);
}
Status ShardingNetworkConnectionHook::validateHostImpl(
const HostAndPort& remoteHost, const executor::RemoteCommandResponse& isMasterReply) {
auto shard = grid.shardRegistry()->getShardForHostNoReload(remoteHost);
if (!shard) {
return {ErrorCodes::ShardNotFound,
str::stream() << "No shard found for host: " << remoteHost.toString()};
}
long long configServerModeNumber;
auto status = bsonExtractIntegerField(isMasterReply.data, "configsvr", &configServerModeNumber);
// TODO SERVER-22320 fix should collapse the switch to only NoSuchKey handling
switch (status.code()) {
case ErrorCodes::OK: {
// The ismaster response indicates remoteHost is a config server.
if (!shard->isConfig()) {
return {ErrorCodes::InvalidOptions,
str::stream() << "Surprised to discover that " << remoteHost.toString()
<< " believes it is a config server"};
}
return Status::OK();
}
case ErrorCodes::NoSuchKey: {
// The ismaster response indicates that remoteHost is not a config server, or that
// the config server is running a version prior to the 3.1 development series.
if (!shard->isConfig()) {
return Status::OK();
}
long long remoteMaxWireVersion;
status = bsonExtractIntegerFieldWithDefault(isMasterReply.data,
"maxWireVersion",
RELEASE_2_4_AND_BEFORE,
&remoteMaxWireVersion);
if (!status.isOK()) {
return status;
}
if (remoteMaxWireVersion < FIND_COMMAND) {
// Prior to the introduction of the find command and the 3.1 release series, it was
// not possible to distinguish a config server from a shard server from its ismaster
// response. As such, we must assume that the system is properly configured.
return Status::OK();
}
return {ErrorCodes::InvalidOptions,
str::stream() << "Surprised to discover that " << remoteHost.toString()
<< " does not believe it is a config server"};
}
default:
// The ismaster response was malformed.
return status;
}
}
StatusWith<boost::optional<executor::RemoteCommandRequest>>
ShardingNetworkConnectionHook::makeRequest(const HostAndPort& remoteHost) {
auto shard = grid.shardRegistry()->getShardForHostNoReload(remoteHost);
if (!shard) {
return {ErrorCodes::ShardNotFound,
str::stream() << "No shard found for host: " << remoteHost.toString()};
}
if (shard->isConfig()) {
// No need to initialize sharding metadata if talking to a config server
return {boost::none};
}
SetShardVersionRequest ssv = SetShardVersionRequest::makeForInitNoPersist(
grid.shardRegistry()->getConfigServerConnectionString(),
shard->getId(),
shard->getConnString());
executor::RemoteCommandRequest request;
request.dbname = "admin";
request.target = remoteHost;
request.timeout = Seconds{30};
request.cmdObj = ssv.toBSON();
return {request};
}
Status ShardingNetworkConnectionHook::handleReply(const HostAndPort& remoteHost,
executor::RemoteCommandResponse&& response) {
return getStatusFromCommandResult(response.data);
}
} // namespace mongo
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