source: mainline/uspace/srv/sysman/connection_ctl.c@ 9532981

/*
 * 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 <macros.h>
#include <stdlib.h>
#include <str.h>

#include "repo.h"
#include "connection_ctl.h"
#include "job.h"
#include "log.h"
#include "sysman.h"


// TODO possibly provide as type-safe function + macro in sysman.h for generic boxing
static ipc_callid_t *box_callid(ipc_callid_t iid)
{
        ipc_callid_t *result = malloc(sizeof(ipc_callid_t));
        if (result) {
                *result = iid;
        }
        return result;
}

static void answer_callback(void *object, void *arg)
{
        job_t *job = object;
        assert(job->state == JOB_FINISHED);
        assert(job->retval != JOB_UNDEFINED_);

        ipc_callid_t *iid_ptr = arg;
        // TODO use descriptive return value (probably refactor job retval)
        sysarg_t retval = (job->retval == JOB_OK) ? EOK : EIO;
        async_answer_0(*iid_ptr, retval);
        free(iid_ptr);
        job_del_ref(&job);
}
static void sysman_unit_start(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 answer;
        }

        int flags = IPC_GET_ARG1(*icall);
        sysman_log(LVL_DEBUG2, "%s(%s, %x)", __func__, unit_name, flags);

        // TODO this is connection fibril, UNSYNCHRONIZED access to units!
        unit_t *unit = repo_find_unit_by_name(unit_name);
        if (unit == NULL) {
                sysman_log(LVL_NOTE, "Unit '%s' not found.", unit_name);
                retval = ENOENT;
                goto answer;
        }

        if (!(flags & IPC_FLAG_BLOCKING)) {
                retval = sysman_run_job(unit, STATE_STARTED, NULL, NULL);
                goto answer;
        }

        ipc_callid_t *iid_ptr = box_callid(iid);
        if (iid_ptr == NULL) {
                retval = ENOMEM;
                goto answer;
        }
        retval = sysman_run_job(unit, STATE_STARTED, &answer_callback,
            iid_ptr);
        if (retval != EOK) {
                goto answer;
        }

        /* Answer asynchronously from callback */
        goto finish;

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

static int fill_handles_buffer(unit_handle_t *buffer, size_t size,
    size_t *act_size)
{
        if (size % sizeof(unit_handle_t) != 0) {
                return EINVAL;
        }

        size_t filled = 0;
        size_t to_fill = size / sizeof(unit_handle_t);
        size_t total = 0;
        list_foreach(units, units, unit_t, u) {
                if (filled < to_fill) {
                        buffer[filled++] = u->handle;
                }
                ++total;
        }
        *act_size = total * sizeof(unit_handle_t);
        return EOK;
}

static void sysman_get_units(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        size_t size;
        size_t act_size;
        int rc;
        
        if (!async_data_read_receive(&callid, &size)) {
                async_answer_0(callid, EREFUSED);
                async_answer_0(iid, EREFUSED);
                return;
        }
        
        
        unit_handle_t *handles = malloc(size);
        if (handles == NULL && size > 0) {
                async_answer_0(callid, ENOMEM);
                async_answer_0(iid, ENOMEM);
                return;
        }
        
        
        // TODO UNSYNCHRONIZED access to units!
        rc = fill_handles_buffer(handles, size, &act_size);
        if (rc != EOK) {
                async_answer_0(callid, rc);
                async_answer_0(iid, rc);
                return;
        }
        
        size_t real_size = min(act_size, size);
        sysarg_t retval = async_data_read_finalize(callid, handles, real_size);
        free(handles);
        
        async_answer_1(iid, retval, act_size);
}

static void sysman_unit_get_name(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        size_t size;
        
        if (!async_data_read_receive(&callid, &size)) {
                async_answer_0(callid, EREFUSED);
                async_answer_0(iid, EREFUSED);
                return;
        }
        
        // TODO UNSYNCHRONIZED access to units!
        unit_t *u = repo_find_unit_by_handle(IPC_GET_ARG1(*icall));
        if (u == NULL) {
                async_answer_0(callid, ENOENT);
                async_answer_0(iid, ENOENT);
                return;
        }
        
        size_t real_size = min(str_size(u->name) + 1, size);
        sysarg_t retval = async_data_read_finalize(callid, u->name, real_size);
        
        async_answer_0(iid, retval);
}

static void sysman_unit_get_state(ipc_callid_t iid, ipc_call_t *icall)
{
        // TODO UNSYNCHRONIZED access to units!
        unit_t *u = repo_find_unit_by_handle(IPC_GET_ARG1(*icall));
        if (u == NULL) {
                async_answer_0(iid, ENOENT);
        } else {
                async_answer_1(iid, EOK, u->state);
        }
}

void sysman_connection_ctl(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_CTL_UNIT_START:
                        sysman_unit_start(callid, &call);
                        break;
                case SYSMAN_CTL_GET_UNITS:
                        sysman_get_units(callid, &call);
                        break;
                case SYSMAN_CTL_UNIT_GET_NAME:
                        sysman_unit_get_name(callid, &call);
                        break;
                case SYSMAN_CTL_UNIT_GET_STATE:
                        sysman_unit_get_state(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOENT);
                }
        }
}