flm01/mote/v2/openwrt/package/flukso/luasrc/fsync.lua

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#!/usr/bin/env lua
2011-01-28 10:17:21 +00:00
--[[
fsync.lua - synchronize /etc/config/flukso settings with the sensor board
via the fluksod ctrl fifos
Copyright (C) 2011 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
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 3 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, see <http://www.gnu.org/licenses/>.
]]--
local dbg = require 'dbg'
local nixio = require 'nixio'
nixio.fs = require 'nixio.fs'
local uci = require 'luci.model.uci'.cursor()
local CTRL_PATH = '/var/run/fluksod/ctrl'
local CTRL_PATH_IN = CTRL_PATH .. '/in'
local CTRL_PATH_OUT = CTRL_PATH .. '/out'
local O_RDWR_NONBLOCK = nixio.open_flags('rdwr', 'nonblock')
local POLLIN = nixio.poll_flags('in')
local POLL_TIMEOUT_MS = 1000
local MAX_TRIES = 5
local ctrl = { fdin = nixio.open(CTRL_PATH_IN, O_RDWR_NONBLOCK),
fdout = nixio.open(CTRL_PATH_OUT, O_RDWR_NONBLOCK),
events = POLLIN,
revents = 0 }
ctrl.fd = ctrl.fdout -- need this entry for nixio.poll
ctrl.line = ctrl.fdout:linesource()
if ctrl.fdin == nil or ctrl.fdout == nil then
print('Error. Unable to open the ctrl fifos.')
print('Exiting...')
os.exit(1)
end
-- TODO acquire an exclusive lock on the ctrl fifos or exit
local function send(ctrl, cmd)
while ctrl.line() do end -- flush the out fifo
for i = 1, MAX_TRIES do
ctrl.fdin:write(cmd .. '\n')
local poll, errno, errmsg = nixio.poll({ ctrl }, POLL_TIMEOUT_MS)
if poll < 0 then
print('Error. Poll failed with error message: ' .. errmsg)
elseif poll == 0 then
print('Error. Poll timed out after ' .. POLL_TIMEOUT_MS .. 'ms')
elseif poll > 0 then
reply = ctrl.line()
if cmd:sub(1, 1) == 's' then
if reply == cmd then
print(reply .. ' .. ok')
return reply
else
print(reply .. ' .. nok .. should be ' .. cmd .. ' instead')
end
elseif cmd:sub(1, 2) == reply:sub(1, 2) then
print(reply .. ' .. ok')
return reply
else
print(reply .. ' .. nok')
end
end
end
print(MAX_TRIES .. ' write attempts failed. Exiting ...')
os.exit(2)
end
local function toc(num)
return num - 1
end
-- parse and load /etc/config/flukso
local flukso = uci:get_all('flukso')
local HW_CHECK_OVERRIDE = (arg[1] == '-f')
local MAX_SENSORS = tonumber(flukso.main.max_sensors)
local METERCONST_FACTOR = 0.449
local GET_HW_VERSION = 'gh'
local GET_HW_VERSION_R = '^gh%s+(%d+)%s+(%d+)$'
local SET_ENABLE = 'se %d %d'
local SET_PHY_TO_LOG = 'sp' -- with [1..MAX_SENSORS] arguments
local SET_METERCONST = 'sm %d %d'
local SET_COUNTER = 'sc %d %d'
-- check hardware version
local hw_major, hw_minor = send(ctrl, GET_HW_VERSION):match(GET_HW_VERSION_R)
if hw_major ~= flukso.main.hw_major or hw_minor > flukso.main.hw_minor then
print(string.format('Hardware check (major: %s, minor: %s) .. nok', hw_major, hw_minor))
if hw_major ~= flukso.main.hw_major then
print('Error. Major version does not match.')
end
if hw_minor > flukso.main.hw_minor then
print('Error. Sensor board minor version is not supported by this package.')
end
if HW_CHECK_OVERRIDE then
print('Overridden. Good luck!')
else
print('Use -f to override this check at your own peril.')
os.exit(3)
end
else
print(string.format('Hardware check (major: %s, minor: %s) .. ok', hw_major, hw_minor))
end
-- disable all ports
for i = 1, MAX_SENSORS do
local cmd = string.format(SET_ENABLE, toc(i), 0)
send(ctrl, cmd)
end
-- populate phy_to_log
local phy_to_log = {}
for i = 1, MAX_SENSORS do
local set = { analog = true, pulse = true }
if flukso[tostring(i)] ~= nil and set[flukso[tostring(i)]['type']] then
local ports = flukso[tostring(i)].port or {}
for j = 1, #ports do
if tonumber(ports[j]) <= MAX_SENSORS then
phy_to_log[toc(tonumber(ports[j]))] = toc(i)
else
print(string.format('Error. Port numbering in sensor %s should be less than or equal to max_sensors (%s)', i, MAX_SENSORS))
os.exit(4)
end
end
end
end
for i = 0, MAX_SENSORS - 1 do
if not phy_to_log[i] then
phy_to_log[i] = 0xff
end
end
local cmd = SET_PHY_TO_LOG .. ' ' .. table.concat(phy_to_log, ' ', 0)
send(ctrl, cmd)
-- populate meterconst
for i = 1, MAX_SENSORS do
local cmd
if flukso[tostring(i)] == nil then
cmd = string.format(SET_METERCONST, toc(i), 0)
elseif flukso[tostring(i)]['type'] == 'analog' then
local voltage = tonumber(flukso[tostring(i)].voltage)
local current = tonumber(flukso[tostring(i)].current)
cmd = string.format(SET_METERCONST, toc(i), math.floor(METERCONST_FACTOR * voltage * current))
elseif flukso[tostring(i)]['type'] == 'pulse'then
local meterconst = tonumber(flukso[tostring(i)].constant)
cmd = string.format(SET_METERCONST, toc(i), meterconst)
else
cmd = string.format(SET_METERCONST, toc(i), 0)
end
if cmd then send(ctrl,cmd) end
end
-- populate counter if reset_counters is set
if flukso.main.reset_counters == '1' then
for i = 1, MAX_SENSORS do
local cmd = string.format(SET_COUNTER, toc(i), 0)
send(ctrl, cmd)
end
uci:set('flukso', 'main', 'reset_counters', 0)
uci:commit('flukso')
end
-- enable configured ports
for i = 1, MAX_SENSORS do
if flukso[tostring(i)] ~= nil and flukso[tostring(i)].enable == '1' then
local ports = flukso[tostring(i)].port or {}
for j = 1, #ports do
cmd = string.format(SET_ENABLE, toc(tonumber(ports[j])), 1)
send(ctrl, cmd)
end
end
end
-- clean up
ctrl.fdin:close()
ctrl.fdout:close()
print(arg[0] .. ' completed successfully. Bye!')