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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include <vector>
#include <tuple>
#include "mongo/client/connpool.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/jsobj.h"
#include "mongo/s/commands/run_on_all_shards_cmd.h"
#include "mongo/s/strategy.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace {
const char kInprogFieldName[] = "inprog";
const char kOpIdFieldName[] = "opid";
const char kClientFieldName[] = "client";
// awkward underscores used to make this visually distinct from kClientFieldName
const char kClient_S_FieldName[] = "client_s";
const char kLegacyInprogCollection[] = "$cmd.sys.inprog";
const char kCommandName[] = "currentOp";
class ClusterCurrentOpCommand : public RunOnAllShardsCommand {
public:
ClusterCurrentOpCommand() : RunOnAllShardsCommand(kCommandName) { }
bool adminOnly() const final { return true; }
Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) final {
bool isAuthorized = client->getAuthorizationSession()->isAuthorizedForActionsOnResource(
ResourcePattern::forClusterResource(),
ActionType::inprog);
return isAuthorized ? Status::OK() : Status(ErrorCodes::Unauthorized, "Unauthorized");
}
// TODO remove after 3.2
BSONObj specialErrorHandler(const std::string& server,
const std::string& db,
const BSONObj& cmdObj,
const BSONObj& originalResult) const final {
// it is unfortunate that this logic needs to be duplicated from
// DBClientWithCommands::runPseudoCommand
// but I don't see a better way to do it without performing heart surgery on
// Future/CommandResponse.
auto status = getStatusFromCommandResult(originalResult);
invariant(!status.isOK());
uassert(28629,
str::stream() << "Received bad "
<< kCommandName
<< " response from server " << server
<< " got: " << originalResult,
status != ErrorCodes::CommandResultSchemaViolation);
// getStatusFromCommandResult handles cooercing "no such command" into the right
// Status type
if (status == ErrorCodes::CommandNotFound) {
// fall back to the old inprog pseudo-command
NamespaceString pseudoCommandNss("admin", kLegacyInprogCollection);
BSONObj legacyResult;
BSONObjBuilder legacyCommandBob;
// need to exclude {currentOp: 1}
for (auto&& cmdElem : cmdObj) {
if (cmdElem.fieldNameStringData() != kCommandName) {
legacyCommandBob.append(cmdElem);
}
}
auto legacyCommand = legacyCommandBob.done();
try {
ScopedDbConnection conn(server);
legacyResult =
conn->findOne(pseudoCommandNss.ns(), legacyCommand);
}
catch (const DBException& ex) {
// If there is a non-DBException exception the entire operation will be
// terminated, as that would be a programmer error.
// We convert the exception to a BSONObj so that the ordinary
// failure path for RunOnAllShardsCommand will handle the failure
// TODO: consider adding an exceptionToBSONObj utility?
BSONObjBuilder b;
b.append("errmsg", ex.toString());
b.append("code", ex.getCode());
return b.obj();
}
return legacyResult;
}
// if the command failed for another reason then we don't retry it.
return originalResult;
}
void aggregateResults(const std::vector<ShardAndReply>& results,
BSONObjBuilder& output) final {
// Each shard responds with a document containing an array of subdocuments.
// Each subdocument represents an operation running on that shard.
// We merge the responses into a single document containg an array
// of the operations from all shards.
// There are two modifications we make.
// 1) we prepend the shardid (with a colon separator) to the opid of each operation.
// This allows users to pass the value of the opid field directly to killOp.
// 2) we change the field name of "client" to "client_s". This is because each
// client is actually a mongos.
// TODO: failpoint for a shard response being invalid.
// Error handling - we maintain the same behavior as legacy currentOp/inprog
// that is, if any shard replies with an invalid response (i.e. it does not
// contain a field 'inprog' that is an array), we ignore it.
//
// If there is a lower level error (i.e. the command fails, network error, etc)
// RunOnAllShardsCommand will handle returning an error to the user.
BSONArrayBuilder aggregatedOpsBab(output.subarrayStart(kInprogFieldName));
for (auto&& shardResponse : results) {
StringData shardName;
BSONObj shardResponseObj;
std::tie(shardName, shardResponseObj) = shardResponse;
auto shardOps = shardResponseObj[kInprogFieldName];
// legacy behavior
if (!shardOps.isABSONObj()) {
warning() << "invalid currentOp response from shard "
<< shardName
<< ", got: "
<< shardOps;
continue;
}
for (auto&& shardOp : shardOps.Obj()) {
BSONObjBuilder modifiedShardOpBob;
// maintain legacy behavior
// but log it first
if (!shardOp.isABSONObj()) {
warning() << "invalid currentOp response from shard "
<< shardName
<< ", got: "
<< shardOp;
continue;
}
for (auto&& shardOpElement : shardOp.Obj()) {
auto fieldName = shardOpElement.fieldNameStringData();
if (fieldName == kOpIdFieldName) {
uassert(28630,
str::stream() << "expected numeric opid from currentOp response"
<< " from shard " << shardName
<< ", got: " << shardOpElement,
shardOpElement.isNumber());
modifiedShardOpBob.append(kOpIdFieldName,
str::stream() << shardName
<< ":"
<< shardOpElement.numberInt());
}
else if (fieldName == kClientFieldName) {
modifiedShardOpBob.appendAs(shardOpElement, kClient_S_FieldName);
}
else {
modifiedShardOpBob.append(shardOpElement);
}
}
modifiedShardOpBob.done();
// append the modified document to the output array
aggregatedOpsBab.append(modifiedShardOpBob.obj());
}
}
aggregatedOpsBab.done();
}
} clusterCurrentOpCmd;
} // namespace
} // namespace mongo
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