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/**
* Copyright (C) 2014 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/base/init.h"
#include "mongo/base/error_codes.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/client_basic.h"
#include "mongo/db/commands.h"
#include "mongo/s/config.h"
#include "mongo/s/grid.h"
#include "mongo/s/stale_exception.h"
#include "mongo/s/strategy.h"
namespace mongo {
using std::string;
using std::stringstream;
using std::vector;
/**
* Base class for mongos index filter commands.
* Cluster index filter commands don't do much more than
* forwarding the commands to all shards and combining the results.
*/
class ClusterIndexFilterCmd : public Command {
MONGO_DISALLOW_COPYING(ClusterIndexFilterCmd);
public:
virtual ~ClusterIndexFilterCmd() {
}
bool slaveOk() const {
return false;
}
bool slaveOverrideOk() const {
return true;
}
virtual bool isWriteCommandForConfigServer() const { return false; }
void help(stringstream& ss) const {
ss << _helpText;
}
Status checkAuthForCommand( ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj ) {
AuthorizationSession* authzSession = AuthorizationSession::get(client);
ResourcePattern pattern = parseResourcePattern(dbname, cmdObj);
if (authzSession->isAuthorizedForActionsOnResource(pattern,
ActionType::planCacheIndexFilter)) {
return Status::OK();
}
return Status(ErrorCodes::Unauthorized, "unauthorized");
}
// Cluster plan cache command entry point.
bool run(OperationContext* txn, const std::string& dbname,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result);
public:
/**
* Instantiates a command that can be invoked by "name", which will be described by
* "helpText", and will require privilege "actionType" to run.
*/
ClusterIndexFilterCmd( const std::string& name, const std::string& helpText) :
Command( name ), _helpText( helpText ) {
}
private:
std::string _helpText;
};
//
// Cluster index filter command implementation(s) below
//
bool ClusterIndexFilterCmd::run(OperationContext* txn, const std::string& dbName,
BSONObj& cmdObj,
int options,
std::string& errMsg,
BSONObjBuilder& result) {
const std::string fullns = parseNs(dbName, cmdObj);
NamespaceString nss(fullns);
// Dispatch command to all the shards.
// Targeted shard commands are generally data-dependent but index filter
// commands are tied to query shape (data has no effect on query shape).
vector<Strategy::CommandResult> results;
Strategy::commandOp(dbName, cmdObj, options, nss.ns(), BSONObj(), &results);
// Set value of first shard result's "ok" field.
bool clusterCmdResult = true;
for (vector<Strategy::CommandResult>::const_iterator i = results.begin();
i != results.end(); ++i) {
const Strategy::CommandResult& cmdResult = *i;
// XXX: In absence of sensible aggregation strategy,
// promote first shard's result to top level.
if (i == results.begin()) {
result.appendElements(cmdResult.result);
clusterCmdResult = cmdResult.result["ok"].trueValue();
}
// Append shard result as a sub object.
// Name the field after the shard.
result.append(cmdResult.shardTargetId, cmdResult.result);
}
return clusterCmdResult;
}
//
// Register index filter commands at startup
//
namespace {
MONGO_INITIALIZER(RegisterIndexFilterCommands)(InitializerContext* context) {
// Leaked intentionally: a Command registers itself when constructed.
new ClusterIndexFilterCmd(
"planCacheListFilters",
"Displays index filters for all query shapes in a collection." );
new ClusterIndexFilterCmd(
"planCacheClearFilters",
"Clears index filter for a single query shape or, "
"if the query shape is omitted, all filters for the collection." );
new ClusterIndexFilterCmd(
"planCacheSetFilter",
"Sets index filter for a query shape. Overrides existing index filter." );
return Status::OK();
}
} // namespace
} // namespace mongo
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