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powerman-pdu.c

/* powerman-pdu.c - Powerman PDU client driver
 *
 * Copyright (C) 2008 Arnaud Quette <aquette.dev@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include "main.h"

#include <libpowerman.h>

#define DRIVER_NAME     "Powerman PDU client driver"
#define DRIVER_VERSION  "0.11"

/* driver description structure */
upsdrv_info_t upsdrv_info = {
      DRIVER_NAME,
      DRIVER_VERSION,
      "Arnaud Quette <aquette.dev@gmail.com>",
      DRV_EXPERIMENTAL,
      { NULL }
};

/* Powerman functions and variables */
static pm_err_t query_one(pm_handle_t pm, char *s, int mode);
static pm_err_t query_all(pm_handle_t pm, int mode);

pm_handle_t pm;
char ebuf[64];

/* modes to snmp_ups_walk. */
#define WALKMODE_INIT   0
#define WALKMODE_UPDATE 1

static int reconnect_ups(void);

static int instcmd(const char *cmdname, const char *extra)
{
      pm_err_t rv = -1;
      char *cmdsuffix = NULL;
      char *cmdindex = NULL;
      char *outletname = NULL;

      upsdebugx(1, "entering instcmd (%s)", cmdname);

      /* only consider the end of the command */
      if ( (cmdsuffix = strrchr(cmdname, '.')) == NULL )
            return STAT_INSTCMD_UNKNOWN;
      else
            cmdsuffix++;

      /* get the outlet name */
      if ( (cmdindex = strchr(cmdname, '.')) == NULL )
            return STAT_INSTCMD_UNKNOWN;
      else {
            char  buf[32];
            cmdindex++;
            snprintf(buf, sizeof(buf), "outlet.%i.desc", atoi(cmdindex));
            outletname = (char *)dstate_getinfo(buf);
      }

      /* Power on the outlet */
      if (!strcasecmp(cmdsuffix, "on")) {
            rv = pm_node_on(pm, outletname);
            return (rv==PM_ESUCCESS)?STAT_INSTCMD_HANDLED:STAT_SET_INVALID;
      }

      /* Power off the outlet */
      if (!strcasecmp(cmdsuffix, "off")) {
            rv = pm_node_off(pm, outletname);
            return (rv==PM_ESUCCESS)?STAT_INSTCMD_HANDLED:STAT_SET_INVALID;
      }

      /* Cycle the outlet */
      if (!strcasecmp(cmdsuffix, "cycle")) {
            rv = pm_node_cycle(pm, outletname);
            return (rv==PM_ESUCCESS)?STAT_INSTCMD_HANDLED:STAT_SET_INVALID;
      }

      upslogx(LOG_NOTICE, "instcmd: unknown command [%s]", cmdname);
      return STAT_INSTCMD_UNKNOWN;
}

void upsdrv_updateinfo(void)
{
      pm_err_t rv = PM_ESUCCESS;

      if ( (rv = query_all(pm, WALKMODE_UPDATE)) != PM_ESUCCESS) {
            upslogx(2, "Error: %s (%i)\n", pm_strerror(rv, ebuf, sizeof(ebuf)), errno);
            /* FIXME: try to reconnect?
             *    dstate_datastale();
             */
            reconnect_ups();
      }
}

void upsdrv_initinfo(void)
{
      pm_err_t rv = PM_ESUCCESS;

      /* try to detect the PDU here - call fatal_with_errno(EXIT_FAILURE, ) if it fails */

      /* FIXME: can we report something useful? */
      dstate_setinfo("ups.mfr", "Powerman");
      dstate_setinfo("device.mfr", "Powerman");
      dstate_setinfo("ups.model", "unknown PDU");
      dstate_setinfo("device.model", "unknown PDU");
      dstate_setinfo("device.type", "pdu");

      /* Now walk the data tree */
      if ( (rv = query_all(pm, WALKMODE_INIT)) != PM_ESUCCESS) {
            upslogx(2, "Error: %s\n", pm_strerror(rv, ebuf, sizeof(ebuf)));
            /* FIXME: try to reconnect?
             *    dstate_datastale();
             */
            reconnect_ups();

      }
      upsh.instcmd = instcmd;
      /* FIXME: no need for setvar (ex for outlet.n.delay.*)!? */
}

void upsdrv_shutdown(void)
{
      /* FIXME: shutdown all outlets? */
      fatalx(EXIT_FAILURE, "shutdown not supported");

      /* OL: this must power cycle the load if possible */
      /* OB: the load must remain off until the power returns */
}

/*
static int setvar(const char *varname, const char *val)
{
      if (!strcasecmp(varname, "outlet.n.delay.*")) {
            ...
            return STAT_SET_HANDLED;
      }

      upslogx(LOG_NOTICE, "setvar: unknown variable [%s]", varname);
      return STAT_SET_UNKNOWN;
}
*/

void upsdrv_help(void)
{
}

/* list flags and values that you want to receive via -x */
void upsdrv_makevartable(void)
{
      /* FIXME: anything useful to be put here? */
}

void upsdrv_initups(void)
{
      pm_err_t rv = PM_ESUCCESS;

      /* Connect to the PowerMan daemon */
      if ((rv = pm_connect(device_path, NULL, &pm, 0)) != PM_ESUCCESS) {
            fatalx(EXIT_FAILURE, "Can't connect to %s: %s\n", device_path,
                  pm_strerror(rv, ebuf, sizeof(ebuf)));
      }

      /* FIXME: suitable?
       * poll_interval = 30; */
}

void upsdrv_cleanup(void)
{
      pm_disconnect(pm);
}

static int reconnect_ups(void)
{
      pm_err_t rv;

      upsdebugx(4, "==================================================");
      upsdebugx(4, "= connexion lost with Powerman, try to reconnect =");
      upsdebugx(4, "==================================================");

      /* clear the situation */
      pm_disconnect(pm);

      /* Connect to the PowerMan daemon */
      if ((rv = pm_connect(device_path, NULL, &pm, 0)) != PM_ESUCCESS)
            return 0;
      else {
            upsdebugx(4, "connexion restored with Powerman");
            return 1;
      }
}

/*
 * powerman support functions
 ****************************/

static pm_err_t query_one(pm_handle_t pm, char *s, int outletnum)
{
      pm_err_t rv;
      pm_node_state_t ns;
      char outlet_prop[64];

      upsdebugx(1, "entering query_one (%s)", s);

      rv = pm_node_status(pm, s, &ns);
      if (rv == PM_ESUCCESS) {

            upsdebugx(3, "updating status");

            snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.status", outletnum);
            dstate_setinfo(outlet_prop, "%s", ns == PM_ON ? "on" :
                                    ns == PM_OFF ? "off" : "unknown");
            dstate_dataok();
      }
      return rv;
}

static pm_err_t query_all(pm_handle_t pm, int mode)
{
      pm_err_t rv;
      pm_node_iterator_t itr;
      char outlet_prop[64];
      char *s;
      int outletnum = 1;

      upsdebugx(1, "entering query_all ()");

      rv = pm_node_iterator_create(pm, &itr);
      if (rv != PM_ESUCCESS)
            return rv;

      while ((s = pm_node_next(itr))) {

            /* in WALKMODE_UPDATE, we always call this one for the
             * status update... */
            if ((rv = query_one(pm, s, outletnum)) != PM_ESUCCESS)
                  break;
            else  {
                  /* set the initial generic properties (ie except status)
                   * but only if the status query succeeded */
                  if (mode == WALKMODE_INIT) {
                        snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.id", outletnum);
                        dstate_setinfo(outlet_prop, "%i", outletnum);

                        snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.desc", outletnum);
                        dstate_setinfo(outlet_prop, "%s", s);

                        /* we assume it's always true! */
                        snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.switchable", outletnum);
                        dstate_setinfo(outlet_prop, "yes");

                        /* add instant commands */
                        snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.load.on", outletnum);
                        dstate_addcmd(outlet_prop);
                        snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.load.off", outletnum);
                        dstate_addcmd(outlet_prop);
                        snprintf(outlet_prop, sizeof(outlet_prop), "outlet.%i.load.cycle", outletnum);
                        dstate_addcmd(outlet_prop);
                  }
            }
            outletnum++;
      }
      pm_node_iterator_destroy(itr);
      return rv;
}

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