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

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#! /usr/bin/env lua
--[[
fluksod.lua - Lua part of the Flukso daemon
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 httpclient = require 'luci.httpclient'
local data = require 'flukso.data'
local arg = arg or {} -- needed when this code is not loaded via the interpreter
local DEBUG = (arg[1] == '-d')
local DAEMON = os.getenv('DAEMON') or 'fluksod'
local DAEMON_PATH = os.getenv('DAEMON_PATH') or '/var/run/' .. DAEMON
local DELTA_PATH = '/var/run/spid/delta'
local DELTA_PATH_IN = DELTA_PATH .. '/in'
local DELTA_PATH_OUT = DELTA_PATH .. '/out'
local O_RDWR = nixio.open_flags('rdwr')
local O_RDWR_NONBLOCK = nixio.open_flags('rdwr', 'nonblock')
local O_RDWR_CREAT = nixio.open_flags('rdwr', 'creat')
local POLLIN = nixio.poll_flags('in')
-- parse and load /etc/config/flukso
local FLUKSO = uci:get_all('flukso')
local WAN_ENABLED = true
local WAN_INTERVAL = 300
local LAN_ENABLED = true
local TIMESTAMP_MIN = 1234567890
-- set WAN parameters
local WAN_FILTER = { [1] = {}, [2] = {}, [3] = {} }
WAN_FILTER[1].span = 60
WAN_FILTER[1].offset = 0
WAN_FILTER[2].span = 900
WAN_FILTER[2].offset = 7200
WAN_FILTER[3].span = 86400
WAN_FILTER[3].offset = 172800
local WAN_BASE_URL = 'https://api.flukso.net/sensor/'
local WAN_KEY = '0123456789abcdef0123456789abcdef'
uci:foreach('system', 'system', function(x) WAN_KEY = x.key end) -- quirky but it works
-- https headers
local FLUKSO_VERSION = '000'
uci:foreach('system', 'system', function(x) FLUKSO_VERSION = x.version end) -- quirky but it works, again
local USER_AGENT = 'Fluksometer v' .. FLUKSO_VERSION
local CACERT = '/etc/ssl/certs/flukso.ca.crt'
-- set LAN parameters
local LAN_POLISH_CUTOFF = 60
local LAN_PUBLISH_PATH = DAEMON_PATH .. '/sensor'
function dispatch(wan_child, lan_child)
return coroutine.create(function()
local delta = { fdin = nixio.open(DELTA_PATH_IN, O_RDWR_NONBLOCK),
fdout = nixio.open(DELTA_PATH_OUT, O_RDWR) }
if delta.fdin == nil or delta.fdout == nil then
-- TODO output to syslog
print('Error. Unable to open the delta fifos.')
print('Exiting...')
os.exit(1)
end
-- TODO acquire an exclusive lock on the delta fifos or exit
local function tolua(num)
return num + 1
end
for line in delta.fdout:linesource() do
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if DEBUG then
print(line)
end
local timestamp, data = line:match('^(%d+)%s+([%d%s]+)$')
timestamp = tonumber(timestamp)
for i, counter, extra in data:gmatch('(%d+)%s+(%d+)%s+(%d+)') do
i = tonumber(i)
counter = tonumber(counter)
extra = tonumber(extra)
-- map index(+1!) to sensor id and sensor type
local sensor_id = FLUKSO[tostring(tolua(i))]['id']
local sensor_type = FLUKSO[tostring(tolua(i))]['type']
-- resume both branches
if WAN_ENABLED then
-- TODO send incoming pulses to syslog
coroutine.resume(wan_child, sensor_id, timestamp, counter)
end
if LAN_ENABLED then
if sensor_type == 'analog' then
coroutine.resume(lan_child, sensor_id, timestamp, extra)
elseif sensor_type == 'pulse' then
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coroutine.resume(lan_child, sensor_id, timestamp, false, counter, extra)
end
end
-- check in the e branch whether the counter has increased, if not then discard
-- chech in both branches whether timestamp has increased
-- or do we override??
end
end
end)
end
function wan_buffer(child)
return coroutine.create(function(sensor_id, timestamp, counter)
local measurements = data.new()
local threshold = timestamp + WAN_INTERVAL
local previous = {}
while true do
if not previous[sensor_id] then
previous[sensor_id] = {}
-- use the first received counter value as guard
previous[sensor_id].timestamp = timestamp
previous[sensor_id].counter = counter
end
if timestamp > TIMESTAMP_MIN
and timestamp > (previous[sensor_id].timestamp or 0)
and counter ~= (previous[sensor_id].counter or 0)
then
measurements:add(sensor_id, timestamp, counter)
previous[sensor_id].timestamp = timestamp
previous[sensor_id].counter = counter
end
if timestamp > threshold and next(measurements) then --checking whether table is not empty
coroutine.resume(child, measurements)
threshold = timestamp + WAN_INTERVAL
end
sensor_id, timestamp, counter = coroutine.yield()
end
end)
end
function filter(child, span, offset)
return coroutine.create(function(measurements)
while true do
measurements:filter(span, offset)
coroutine.resume(child, measurements)
measurements = coroutine.yield()
end
end)
end
function send(child)
return coroutine.create(function(measurements)
local headers = {}
headers['Content-Type'] = 'application/json'
headers['X-Version'] = '1.0'
headers['User-Agent'] = USER_AGENT
local options = {}
options.sndtimeo = 5
options.rcvtimeo = 5
options.method = 'POST'
options.tls_context_set_verify = 'peer'
options.cacert = CACERT
options.headers = headers
while true do
local sensors = measurements:get_sensors()
local measurements_json = measurements:json_encode()
local http_persist = httpclient.create_persistent()
for i, sensor_id in ipairs(sensors) do
if i ~= #sensors then
options.headers['Connection'] = 'keep-alive'
else
options.headers['Connection'] = 'close'
end
options.body = '{"measurements":' .. measurements_json[sensor_id] .. '}'
options.headers["Content-Length"] = tostring(#options.body)
local hash = nixio.crypto.hmac('sha1', WAN_KEY)
hash:update(options.body)
options.headers['X-Digest'] = hash:final()
local response, code, msg = http_persist(WAN_BASE_URL .. sensor_id, options)
if response then
-- TODO send response string to syslog
measurements:clear(sensor_id)
end
end
coroutine.resume(child, measurements)
measurements = coroutine.yield()
end
end)
end
function gc(child)
return coroutine.create(function(measurements)
while true do
collectgarbage() -- force a complete garbage collection cycle
coroutine.resume(child, measurements)
measurements = coroutine.yield()
end
end)
end
function lan_buffer(child)
return coroutine.create(function(sensor_id, timestamp, power, counter, msec)
local measurements = data.new()
local previous = {}
local function diff(x, y) -- calculates y - x
if y >= x then
return y - x
else -- y wrapped around 32-bit boundary
return 4294967296 - x + y
end
end
while true do
if not previous[sensor_id] then
previous[sensor_id] = {}
end
if timestamp > TIMESTAMP_MIN and timestamp > (previous[sensor_id].timestamp or 0) then
if not power then -- we're dealing pulse message so first calculate power
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if previous[sensor_id].msec and msec > previous[sensor_id].msec then
power = math.floor(diff(previous[sensor_id].counter, counter) /
diff(previous[sensor_id].msec, msec) * 3.6 * 10^6 + 0.5)
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end
-- if msec decreased, just update the value in the table
-- but don't make any power calculations since the AVR might have gone through a reset
previous[sensor_id].msec = msec
previous[sensor_id].counter = counter
end
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if power then
measurements:add(sensor_id, timestamp, power)
previous[sensor_id].timestamp = timestamp
end
end
if next(measurements) then --checking whether table is not empty
coroutine.resume(child, measurements)
end
sensor_id, timestamp, power, counter, msec = coroutine.yield()
end
end)
end
function polish(child, cutoff)
return coroutine.create(function(measurements)
while true do
measurements:fill()
measurements:truncate(cutoff)
coroutine.resume(child, measurements)
measurements = coroutine.yield()
end
end)
end
function publish(child, dir)
return coroutine.create(function(measurements)
nixio.fs.mkdirr(dir)
for file in nixio.fs.dir(dir) do
nixio.fs.unlink(file)
end
while true do
local measurements_json = measurements:json_encode()
for sensor_id, json in pairs(measurements_json) do
local file = dir .. '/' .. sensor_id
nixio.fs.unlink(file)
fd = nixio.open(file, O_RDWR_CREAT)
fd:write(json)
fd:close()
end
coroutine.resume(child, measurements)
measurements = coroutine.yield()
end
end)
end
function debug(child)
return coroutine.create(function(measurements)
while true do
if DEBUG then
dbg.vardump(measurements)
end
if child then
coroutine.resume(child, measurements)
end
measurements = coroutine.yield()
end
end)
end
local wan_chain =
wan_buffer(
filter(
filter(
filter(
send(
gc(
debug(nil)
)
)
, WAN_FILTER[3].span, WAN_FILTER[3].offset)
, WAN_FILTER[2].span, WAN_FILTER[2].offset)
, WAN_FILTER[1].span, WAN_FILTER[1].offset)
)
local lan_chain =
lan_buffer(
polish(
publish(
debug(nil)
, LAN_PUBLISH_PATH)
, LAN_POLISH_CUTOFF)
)
local chain = dispatch(wan_chain, lan_chain)
coroutine.resume(chain)