source: mainline/uspace/srv/sysman/connection_broker.c@ c6d87c10

/*
 * Copyright (c) 2015 Michal Koutny
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <errno.h>
#include <ipc/sysman.h>
#include <stdlib.h>

#include "configuration.h"
#include "connection_broker.h"
#include "log.h"
#include "sysman.h"

static void sysman_broker_register(ipc_callid_t iid, ipc_call_t *icall)
{
        sysman_log(LVL_DEBUG2, "%s", __func__);
        async_answer_0(iid, EOK);
        /* TODO implement
         *  What exactly? Similar behavior that has locsrv with servers,
         *  so that subsequent calls can be assigned to broker. Still that
         *  makes sense only when brokers will somehow scope unit/exposee
         *  names. Why I wanted this registration?
         */
}

static void sysman_ipc_forwarded(ipc_callid_t iid, ipc_call_t *icall)
{
        sysman_log(LVL_DEBUG2, "%s", __func__);
        async_answer_0(iid, ENOTSUP);
        // TODO implement
}

static void sysman_main_exposee_added(ipc_callid_t iid, ipc_call_t *icall)
{
        char *unit_name = NULL;
        sysarg_t retval;

        int rc = async_data_write_accept((void **) &unit_name, true,
            0, 0, 0, NULL);
        if (rc != EOK) {
                retval = rc;
                goto finish;
        }

        unit_t *unit = configuration_find_unit_by_name(unit_name);
        if (unit == NULL) {
                //sysman_log(LVL_NOTE, "Unit '%s' not found.", unit_name);
                retval = ENOENT;
                goto finish;
        }

        // TODO propagate caller task ID
        sysman_raise_event(&sysman_event_unit_exposee_created, unit);

        retval = EOK;

finish:
        async_answer_0(iid, retval);
        free(unit_name);
}

static void sysman_exposee_added(ipc_callid_t iid, ipc_call_t *icall)
{
        char *exposee = NULL;
        sysarg_t retval;

        /* Just accept data and further not supported. */
        int rc = async_data_write_accept((void **) &exposee, true,
            0, 0, 0, NULL);
        if (rc != EOK) {
                retval = rc;
                goto finish;
        }

        //sysman_log(LVL_DEBUG2, "%s(%s)", __func__, exposee);

        retval = ENOTSUP;

finish:
        async_answer_0(iid, retval);
        free(exposee);
}

static void sysman_exposee_removed(ipc_callid_t iid, ipc_call_t *icall)
{
        sysman_log(LVL_DEBUG2, "%s", __func__);
        async_answer_0(iid, ENOTSUP);
        // TODO implement
}

void sysman_connection_broker(ipc_callid_t iid, ipc_call_t *icall)
{
        sysman_log(LVL_DEBUG2, "%s", __func__);
        /* First, accept connection */
        async_answer_0(iid, EOK);

        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);

                if (!IPC_GET_IMETHOD(call)) {
                        /* Client disconnected */
                        break;
                }

                switch (IPC_GET_IMETHOD(call)) {
                case SYSMAN_BROKER_REGISTER:
                        sysman_broker_register(callid, &call);
                        break;
                case SYSMAN_BROKER_IPC_FWD:
                        sysman_ipc_forwarded(callid, &call);
                        break;
                case SYSMAN_BROKER_MAIN_EXP_ADDED:
                        sysman_main_exposee_added(callid, &call);
                        break;
                case SYSMAN_BROKER_EXP_ADDED:
                        sysman_exposee_added(callid, &call);
                        break;
                case SYSMAN_BROKER_EXP_REMOVED:
                        sysman_exposee_removed(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOENT);
                }
        }
}