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/**
 * Copyright (C) 2017 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 "mongo/db/kill_sessions_common.h"

#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/session_killer.h"
#include "mongo/util/log.h"

namespace mongo {

SessionKiller::Result killSessionsLocalKillOps(OperationContext* opCtx,
                                               const SessionKiller::Matcher& matcher) {
    for (ServiceContext::LockedClientsCursor cursor(opCtx->getClient()->getServiceContext());
         Client* client = cursor.next();) {
        invariant(client);
        stdx::unique_lock<Client> lk(*client);

        OperationContext* opCtxToKill = client->getOperationContext();
        if (opCtxToKill) {
            const auto& lsid = opCtxToKill->getLogicalSessionId();

            if (lsid) {
                if (const KillAllSessionsByPattern* pattern = matcher.match(*lsid)) {
                    ScopedKillAllSessionsByPatternImpersonator impersonator(opCtx, *pattern);

                    log() << "killing op: " << opCtxToKill->getOpID()
                          << " as part of killing session: " << lsid->toBSON();

                    opCtx->getServiceContext()->killOperation(opCtxToKill);
                }
            }
        }
    }

    return {std::vector<HostAndPort>{}};
}

Status killSessionsCmdHelper(OperationContext* opCtx,
                             BSONObjBuilder& result,
                             const KillAllSessionsByPatternSet& patterns) {
    auto killResult = SessionKiller::get(opCtx)->kill(opCtx, patterns);

    if (!killResult->isOK()) {
        return killResult->getStatus();
    }

    if (!killResult->getValue().empty()) {
        BSONArrayBuilder bab(result.subarrayStart("failedHosts"));
        for (const auto& host : killResult->getValue()) {
            bab.append(host.toString());
        }

        return Status(ErrorCodes::HostUnreachable, "Failed to kill on some hosts");
    }

    return Status::OK();
}

}  // namespace mongo