mirror of
https://github.com/MikaylaFischler/cc-mek-scada.git
synced 2024-08-30 18:22:34 +00:00
289 lines
9.0 KiB
Lua
289 lines
9.0 KiB
Lua
local comms = require("scada-common.comms")
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local log = require("scada-common.log")
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local mqueue = require("scada-common.mqueue")
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local util = require("scada-common.util")
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local iocontrol = require("coordinator.iocontrol")
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local pocket = {}
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local PROTOCOL = comms.PROTOCOL
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local CRDN_TYPE = comms.CRDN_TYPE
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local MGMT_TYPE = comms.MGMT_TYPE
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-- retry time constants in ms
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-- local INITIAL_WAIT = 1500
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-- local RETRY_PERIOD = 1000
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local API_S_CMDS = {
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}
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local API_S_DATA = {
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}
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pocket.API_S_CMDS = API_S_CMDS
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pocket.API_S_DATA = API_S_DATA
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local PERIODICS = {
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KEEP_ALIVE = 2000
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}
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-- pocket API session
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---@nodiscard
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---@param id integer session ID
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---@param s_addr integer device source address
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---@param i_seq_num integer initial sequence number
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---@param in_queue mqueue in message queue
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---@param out_queue mqueue out message queue
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---@param timeout number communications timeout
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function pocket.new_session(id, s_addr, i_seq_num, in_queue, out_queue, timeout)
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local log_header = "pkt_session(" .. id .. "): "
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local self = {
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-- connection properties
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seq_num = i_seq_num + 2, -- next after the establish approval was sent
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r_seq_num = i_seq_num + 1,
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connected = true,
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conn_watchdog = util.new_watchdog(timeout),
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last_rtt = 0,
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-- periodic messages
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periodics = {
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last_update = 0,
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keep_alive = 0
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},
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-- when to next retry one of these requests
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retry_times = {
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},
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-- command acknowledgements
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acks = {
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},
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-- session database
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---@class api_db
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sDB = {
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}
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}
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---@class pkt_session
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local public = {}
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-- mark this pocket session as closed, stop watchdog
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local function _close()
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self.conn_watchdog.cancel()
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self.connected = false
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iocontrol.fp_pkt_disconnected(id)
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end
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-- send a CRDN packet
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---@param msg_type CRDN_TYPE
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---@param msg table
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local function _send(msg_type, msg)
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local s_pkt = comms.scada_packet()
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local c_pkt = comms.crdn_packet()
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c_pkt.make(msg_type, msg)
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s_pkt.make(s_addr, self.seq_num, PROTOCOL.SCADA_CRDN, c_pkt.raw_sendable())
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out_queue.push_packet(s_pkt)
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self.seq_num = self.seq_num + 1
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end
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-- send a SCADA management packet
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---@param msg_type MGMT_TYPE
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---@param msg table
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local function _send_mgmt(msg_type, msg)
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local s_pkt = comms.scada_packet()
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local m_pkt = comms.mgmt_packet()
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m_pkt.make(msg_type, msg)
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s_pkt.make(s_addr, self.seq_num, PROTOCOL.SCADA_MGMT, m_pkt.raw_sendable())
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out_queue.push_packet(s_pkt)
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self.seq_num = self.seq_num + 1
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end
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-- handle a packet
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---@param pkt mgmt_frame|crdn_frame
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local function _handle_packet(pkt)
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-- check sequence number
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if self.r_seq_num ~= pkt.scada_frame.seq_num() then
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log.warning(log_header .. "sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. pkt.scada_frame.seq_num())
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return
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else
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self.r_seq_num = pkt.scada_frame.seq_num() + 1
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end
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-- feed watchdog
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self.conn_watchdog.feed()
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-- process packet
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if pkt.scada_frame.protocol() == PROTOCOL.SCADA_CRDN then
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---@cast pkt crdn_frame
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local db = iocontrol.get_db()
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-- handle packet by type
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if pkt.type == CRDN_TYPE.API_GET_FAC then
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local fac = db.facility
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local data = {
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fac.all_sys_ok,
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fac.rtu_count,
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fac.radiation,
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{ fac.auto_ready, fac.auto_active, fac.auto_ramping, fac.auto_saturated },
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{ fac.auto_current_waste_product, fac.auto_pu_fallback_active },
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util.table_len(fac.tank_data_tbl),
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fac.induction_data_tbl[1] ~= nil,
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fac.sps_data_tbl[1] ~= nil,
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}
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_send(CRDN_TYPE.API_GET_FAC, data)
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elseif pkt.type == CRDN_TYPE.API_GET_UNIT then
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if pkt.length == 1 and type(pkt.data[1]) == "number" then
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local u = db.units[pkt.data[1]] ---@type ioctl_unit
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if u then
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local data = {
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u.unit_id,
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u.connected,
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u.rtu_hw,
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u.alarms,
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u.annunciator,
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u.reactor_data,
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u.boiler_data_tbl,
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u.turbine_data_tbl,
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u.tank_data_tbl,
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u.last_rate_change_ms,
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u.turbine_flow_stable
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}
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_send(CRDN_TYPE.API_GET_UNIT, data)
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end
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end
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else
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log.debug(log_header .. "handler received unsupported CRDN packet type " .. pkt.type)
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end
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elseif pkt.scada_frame.protocol() == PROTOCOL.SCADA_MGMT then
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---@cast pkt mgmt_frame
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if pkt.type == MGMT_TYPE.KEEP_ALIVE then
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-- keep alive reply
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if pkt.length == 2 then
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local srv_start = pkt.data[1]
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-- local api_send = pkt.data[2]
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local srv_now = util.time()
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self.last_rtt = srv_now - srv_start
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if self.last_rtt > 750 then
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log.warning(log_header .. "PKT KEEP_ALIVE round trip time > 750ms (" .. self.last_rtt .. "ms)")
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end
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-- log.debug(log_header .. "PKT RTT = " .. self.last_rtt .. "ms")
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-- log.debug(log_header .. "PKT TT = " .. (srv_now - api_send) .. "ms")
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iocontrol.fp_pkt_rtt(id, self.last_rtt)
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else
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log.debug(log_header .. "SCADA keep alive packet length mismatch")
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end
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elseif pkt.type == MGMT_TYPE.CLOSE then
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-- close the session
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_close()
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else
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log.debug(log_header .. "handler received unsupported SCADA_MGMT packet type " .. pkt.type)
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end
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end
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end
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-- PUBLIC FUNCTIONS --
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-- get the session ID
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---@nodiscard
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function public.get_id() return id end
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-- get the session database
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---@nodiscard
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function public.get_db() return self.sDB end
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-- check if a timer matches this session's watchdog
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---@nodiscard
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function public.check_wd(timer)
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return self.conn_watchdog.is_timer(timer) and self.connected
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end
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-- close the connection
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function public.close()
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_close()
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_send_mgmt(MGMT_TYPE.CLOSE, {})
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log.info(log_header .. "session closed by server")
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end
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-- iterate the session
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---@nodiscard
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---@return boolean connected
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function public.iterate()
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if self.connected then
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------------------
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-- handle queue --
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------------------
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local handle_start = util.time()
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while in_queue.ready() and self.connected do
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-- get a new message to process
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local message = in_queue.pop()
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if message ~= nil then
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if message.qtype == mqueue.TYPE.PACKET then
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-- handle a packet
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_handle_packet(message.message)
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elseif message.qtype == mqueue.TYPE.COMMAND then
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-- handle instruction
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elseif message.qtype == mqueue.TYPE.DATA then
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-- instruction with body
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end
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end
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-- max 100ms spent processing queue
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if util.time() - handle_start > 100 then
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log.warning(log_header .. "exceeded 100ms queue process limit")
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break
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end
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end
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-- exit if connection was closed
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if not self.connected then
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log.info(log_header .. "session closed by remote host")
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return self.connected
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end
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----------------------
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-- update periodics --
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----------------------
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local elapsed = util.time() - self.periodics.last_update
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local periodics = self.periodics
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-- keep alive
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periodics.keep_alive = periodics.keep_alive + elapsed
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if periodics.keep_alive >= PERIODICS.KEEP_ALIVE then
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_send_mgmt(MGMT_TYPE.KEEP_ALIVE, { util.time() })
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periodics.keep_alive = 0
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end
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self.periodics.last_update = util.time()
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---------------------
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-- attempt retries --
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---------------------
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-- local rtimes = self.retry_times
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end
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return self.connected
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end
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return public
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end
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return pocket
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