/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    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 Server Side 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/logv2/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);

                    LOGV2(20706,
                          "Killing op {opId} as part of killing session {lsid}",
                          "Killing op as part of killing session",
                          "opId"_attr = opCtxToKill->getOpID(),
                          "lsid"_attr = lsid->toBSON());

                    opCtx->getServiceContext()->killOperation(lk, 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