256 lines
8.0 KiB
Lua
Executable File
256 lines
8.0 KiB
Lua
Executable File
#!/usr/bin/env lua
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--
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-- flukso.lua: flukso deamon running on openwrt
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-- Copyright (c) 2008-2009 jokamajo.org
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-- 2010 flukso.net
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--
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-- This program is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU General Public License
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-- as published by the Free Software Foundation; either version 2
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-- of the License, or (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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--
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-- $Id$
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--
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require 'posix'
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require 'xmlrpc.http'
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data = require 'flukso.data'
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auth = require 'flukso.auth'
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dbg = require 'flukso.dbg'
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local param = {xmlrpcaddress = 'http://logger.flukso.net/xmlrpc',
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xmlrpcversion = '1',
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xmlrpcmethod = 'logger.measurementAdd',
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pwrenable = true,
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pwrinterval = 0,
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pwrdir = '/tmp/sensor',
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device = '/dev/ttyS0',
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interval = 300,
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dbgenable = false}
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function dispatch(e_child, p_child, device, pwrenable)
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return coroutine.create(function()
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local function flash() -- flash the power led for 50ms
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os.execute('gpioctl clear 4 > /dev/null')
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socket.select(nil, nil, 0.05)
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os.execute('gpioctl set 4 > /dev/null')
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end
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-- open the connection to the syslog deamon, specifying our identity
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posix.openlog('flukso')
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posix.syslog(30, 'starting the flukso deamon')
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posix.syslog(30, 'listening for pulses on '..device..'...')
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local pattern = '^(%l+)%s(%x+):(%d+):?(%d*)$'
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for line in io.lines(device) do
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local command, meter, value, msec = line:match(pattern)
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value = tonumber(value or '0')
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msec = tonumber(msec or '0')
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local length = line:len()
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if command == 'pls' and (length == 47 or length == 58) then -- user data
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flash()
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posix.syslog(30, 'received pulse from ' .. device .. ': ' .. line:sub(5))
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coroutine.resume(e_child, meter, os.time(), value)
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-- pls includes a msec timestamp so report to p_child as well
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if length == 58 then
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coroutine.resume(p_child, meter, os.time(), value, msec)
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end
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elseif command == 'pwr' and length == 47 then -- user data
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if pwrenable then coroutine.resume(p_child, meter, os.time(), value) end
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elseif command == 'msg' then -- control data
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posix.syslog(31, 'received message from ' .. device .. ': ' .. line:sub(5))
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else -- error
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posix.syslog(27, 'input error on ' .. device .. ': ' .. line)
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end
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end
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posix.syslog(30, 'closing down the flukso deamon')
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os.exit(1)
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end)
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end
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function buffer(child, interval)
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return coroutine.create(function(meter, timestamp, value, msec)
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local measurements = data.new()
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local threshold = timestamp + interval
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local prev = {}
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local function diff(x, y) -- calculates y - x
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if y >= x then
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return y - x
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else -- y wrapped around 32-bit boundary
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return 4294967296 - x + y
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end
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end
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while true do
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if meter ~= nil then
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if not prev[meter] then
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prev[meter] = {}
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end
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if msec then -- we're dealing with a pls xxx:yyy:zzz message so calculate power
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if prev[meter].msec then
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local power = math.floor(diff(prev[meter].value, value) / diff(prev[meter].msec, msec) * 3.6 * 10^6 + 0.5)
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prev[meter].value = value
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value = power
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else
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prev[meter].value = value
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value = nil
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end
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prev[meter].msec = msec
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end
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if timestamp > math.max(1234567890, prev[meter].timestamp or 0) and value then
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measurements:add(meter, timestamp, value)
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end
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end
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if timestamp > threshold and next(measurements) then --checking whether table is not empty
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coroutine.resume(child, measurements)
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threshold = timestamp + interval
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prev[meter].timestamp = timestamp
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end
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meter, timestamp, value, msec = coroutine.yield()
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end
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end)
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end
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function filter(child, span, offset)
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return coroutine.create(function(measurements)
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while true do
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measurements:filter(span, offset)
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coroutine.resume(child, measurements)
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measurements = coroutine.yield()
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end
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end)
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end
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function send(child, address, version, method)
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return coroutine.create(function(measurements)
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while true do
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local auth = auth.new()
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auth:load()
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auth:hmac(measurements)
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local status, ret_or_err, res = pcall(xmlrpc.http.call,
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address..'/'..version,
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method,
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auth,
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measurements)
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if status then
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posix.syslog(30, tostring(res))
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if ret_or_err then --successful xmlrpc call
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measurements:clear()
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end
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else
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posix.syslog(27, tostring(ret_or_err)..' '..address..' '..tostring(res))
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end
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coroutine.resume(child, measurements)
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measurements = coroutine.yield()
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end
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end)
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end
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function gc(child)
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return coroutine.create(function(measurements)
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while true do
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posix.syslog(31, tostring(collectgarbage('count')*1024)..' bytes of memory used by Lua before garbage collection cycle')
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collectgarbage() -- force a complete garbage collection cycle
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posix.syslog(31, tostring(collectgarbage('count')*1024)..' bytes of memory used by Lua after garbage collection cycle')
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coroutine.resume(child, measurements)
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measurements = coroutine.yield()
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end
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end)
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end
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function polish(child, cutoff)
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return coroutine.create(function(measurements)
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while true do
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measurements:fill()
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measurements:truncate(cutoff)
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coroutine.resume(child, measurements)
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measurements = coroutine.yield()
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end
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end)
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end
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function publish(child, dir)
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return coroutine.create(function(measurements)
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os.execute('mkdir -p ' .. dir .. ' > /dev/null')
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while true do
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local measurements_json = measurements:json_encode()
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for meter, json in pairs(measurements_json) do
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io.output(dir .. '/' .. meter)
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io.write(json)
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io.close()
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end
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coroutine.resume(child, measurements)
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measurements = coroutine.yield()
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end
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end)
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end
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function debug(child, dbgenable)
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return coroutine.create(function(measurements)
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while true do
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if dbgenable then dbg.vardump(measurements) end
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if child then coroutine.resume(child, measurements) end
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measurements = coroutine.yield()
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end
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end)
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end
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-- dispatch: listen to the serial port for incoming pulses
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-- buffer: buffer the pulses in a measurement object
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-- filter: sweep recursively to filter all redundant entries
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-- send: report the measurements to the server via xmlrpc
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-- gc: perform a full garbage collection cycle
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-- debug: dump measurements table to stdout
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local e_chain = buffer(
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filter(
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filter(
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filter(
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send(
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gc(
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debug(nil, param.dbgenable)
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)
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, param.xmlrpcaddress, param.xmlrpcversion, param.xmlrpcmethod)
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, 86400, 172800)
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, 900, 7200)
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, 60, 0)
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, param.interval)
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local p_chain = buffer(
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polish(
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publish(
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debug(nil, param.dbgenable)
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, param.pwrdir)
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, 60)
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, param.pwrinterval)
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local chain = dispatch(e_chain, p_chain, param.device, param.pwrenable)
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coroutine.resume(chain)
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