diff --git a/src/component/modem.lua b/src/component/modem.lua index c2a3cf5..ab088c4 100644 --- a/src/component/modem.lua +++ b/src/component/modem.lua @@ -1,6 +1,343 @@ local address, _, wireless = ... +print(address, _, wireless); compCheckArg(1,wireless,"boolean") +local socket = require("socket") +local ser = require("loot.OpenOS.lib.serialization") + +-- yes, global +modem_host = {} + +-- modem component +local obj = {} + +-- Modem cards communicate on a real backend port +modem_host.comms_port = 61234 +modem_host.comms_ip = "127.0.0.10" +modem_host.connected = false +modem_host.messages = {} +modem_host.socket = nil + +modem_host.hosting = false +modem_host.clients = {} + +-- [port_number] = true when open +modem_host.open_ports = {} + +function modem_host.createPacketArray(t, address, port, ...) + compCheckArg(1,t,type("")) + compCheckArg(2,address,type(""),type(0)) + compCheckArg(3,port,type(0)) + + local packed = + { + t, + address, + modem_host.id, + port, + 0, -- distance + ... + } + + return packed +end + +function modem_host.packetArrayToPacket(packed) + compCheckArg(1,packed,type({})) + assert(#packed >= 5) + + local packet = {} + packet.type = packed[1] + packet.target = packed[2] + packet.source = packed[3] + packet.port = packed[4] + packet.distance = packed[5] + packet.payload = {} + + for i=6,#packed do + table.insert(packet.payload, packed[i]) + end + + return packet +end + +function modem_host.packetArrayToDatagram(packed) + compCheckArg(1,packed,type({})) + + local datagram = ser.serialize(packed) + return datagram .. '\n' +end + +function modem_host.packetToPacketArray(packet) + return + { + packet.type, + packet.target, + packet.source, + packet.port, + packet.distance, + table.unpack(packet.payload or {}) + } +end + +function modem_host.datagramToPacketArray(datagram) + compCheckArg(1,datagram,type("")) + local packed = ser.unserialize(datagram) + return packed +end + +function modem_host.datagramToPacket(datagram) + local packed = modem_host.datagramToPacketArray(datagram) + local packet = modem_host.packedToPacket(packed) + return packet +end + +function modem_host.packetToDatagram(packet) + local packed = modem_host.packetToPacketArray(packet) + local datagram = modem_host.packetArrayToDatagram(packed) + return datagram +end + +function modem_host.readDatagram(client) -- client:receive() + local raw, err = client:receive() + if raw then cprint("received: " .. raw) end + return raw, err +end + +function modem_host.readPacketArray(client) -- client:receive() + local datagram, err = modem_host.readDatagram(client) + if not datagram then return nil, err end + return modem_host.datagramToPacketArray(datagram) +end + +function modem_host.readPacket(client) -- client:receive() + local packed, err = modem_host.readPacketArray(client) + if not packed then return nil, err end + return modem_host.packetArrayToPacket(packed) +end + +function modem_host.sendDatagram(client, datagram) + cprint("sending: " .. datagram) + return client:send(datagram) +end + +function modem_host.sendPacketArray(client, packed) + local datagram = modem_host.packetArrayToDatagram(packed) + return modem_host.sendDatagram(client, datagram) +end + +function modem_host.sendPacket(client, packet) + local datagram = modem_host.packetToDatagram(packet) + return modem_host.sendDatagram(client, datagram) +end + +function modem_host.broadcast(packet) + -- only host broadcasts + -- this method will be hit for all broadcasted messages + -- but nonhosting clients will simply not repeat the broadcast + if modem_host.hosting then + local datagram = modem_host.packetToDatagram(packet) + for addr,client in pairs(modem_host.clients) do + modem_host.sendDatagram(client, datagram) + end + end +end + +function modem_host.validTarget(target) + if target == 0 then + return true + end + + if target == modem_host.id then + return true + end + + if not modem_host.hosting then + return false + end + + for address,client in pairs(modem_host.clients) do + if address == target then + return true + end + end + + return false +end + +-- backend private methods, these are not pushed to user machine environments +function modem_host.pushMessage(packet) + if not modem_host.validTarget(packet.target) then + return false, "invalid target, no such client listening" --ignored + end + + table.insert(modem_host.messages, packet) + + return true +end + +function modem_host.dispatchPacket(packet) + if packet.target == modem_host.id then + if obj.isOpen(packet.port) then + table.insert(machine.signals, modem_host.packetToPacketArray(packet)) + end + elseif modem_host.hosting then -- if hosting we will route + for source,client in pairs(modem_host.clients) do + if source == packet.target then + modem_host.sendPacket(client, packet) + break + end + end + else -- not hosting, send to host + modem_host.sendPacket(modem_host.socket, packet) + end +end + +function modem_host.processPendingMessages() + -- computer address seems to be applied late + if not modem_host.id then + modem_host.id = component.list("computer",true)() + assert(modem_host.id) + end + + modem_host.recvPendingMessages() + + for _,packet in pairs(modem_host.messages) do + + if packet.type == 'modem_message' then + -- broadcast if no target + if packet.target == 0 then + modem_host.broadcast(packet) -- ignored by clients + + -- clean up for broadcasting to self + packet.target = modem_host.id + end + + modem_host.dispatchPacket(packet) + end + end + + modem_host.messages = {} +end + +function modem_host.recvPendingMessages() + if modem_host.hosting then + while true do + local client = modem_host.socket:accept() + if not client then + break; + end + + local handshake, err = modem_host.readPacket(client) -- client:receive() + if not handshake then + client:close() + else + + local connectionResponse + local accepted = false + if handshake.type ~= "handshake" then + connectionResponse = modem_host.createPacketArray("handshake", modem_host.id, -1, + false, "unsupported message type"); + elseif modem_host.validTarget(handshake.source) then -- repeated client + connectionResponse = modem_host.createPacketArray("handshake", modem_host.id, -1, + false, "computer address conflict detected, ignoring connection"); + else + client:settimeout(0, 't') + modem_host.clients[handshake.source] = client + accepted = true + + connectionResponse = modem_host.createPacketArray("handshake", modem_host.id, -1, true); + end + + modem_host.sendPacketArray(client, connectionResponse) + + if not accepted then + client:close() + end + end + end + + -- recv all pending packets + for source, client in pairs(modem_host.clients) do + local packet, err = modem_host.readPacket(client) + if packet then + modem_host.pushMessage(packet) + elseif err ~= "timeout" then + client:close() + modem_host.clients[source] = nil + end + end + elseif modem_host.socket then + while true do + local packet, err = modem_host.readPacket(modem_host.socket) + if packet then + modem_host.pushMessage(packet) + else + break + end + end + end +end + +function modem_host.createNewMessageBoard() + local why + modem_host.socket, why = socket.bind(modem_host.comms_ip, modem_host.comms_port) + if modem_host.socket then + modem_host.hosting = true + end + return modem_host.socket, why +end + +function modem_host.joinExistingMessageBoard() + local why + modem_host.socket, why = socket.connect(modem_host.comms_ip, modem_host.comms_port) + if modem_host.socket then + modem_host.hosting = nil + + -- send handshake data + local packed = modem_host.createPacketArray("handshake", 0, -1) + local sendResult = modem_host.sendPacketArray(modem_host.socket, packed) + + local response, why = modem_host.readPacket(modem_host.socket) + assert(response) + assert(response.payload) + + if not response.payload[1] then + modem_host.socket:close() + modem_host.socket = nil + return false, response.payload[2], true + end + end + return modem_host.socket, why +end + +function modem_host.connectMessageBoard() + if modem_host.connected then + return true + end + + local ok, info, critical = modem_host.joinExistingMessageBoard() + + if not ok and critical then + return nil, info + end + + if not ok then + ok, info = modem_host.createNewMessageBoard() + end + + if not ok then + return nil, info + end + + modem_host.socket:settimeout(0, 't') -- accept calls must be already pending + modem_host.connected = true + modem_host.clients = {} + modem_host.messages = {} + + return true +end + local wakeMessage local strength if wireless then @@ -14,78 +351,104 @@ local function checkPort(port) return math.floor(port) end --- modem component -local obj = {} - function obj.send(address, port, ...) -- Sends the specified data to the specified target. - --STUB cprint("modem.send",address, port, ...) compCheckArg(1,address,"string") compCheckArg(2,port,"number") port=checkPort(port) - return true + + local packed = modem_host.createPacketArray("modem_message", address, port, ...) + local packet = modem_host.packetArrayToPacket(packed) + return modem_host.dispatchPacket(packet) end + function obj.getWakeMessage() -- Get the current wake-up message. - --STUB cprint("modem.getWakeMessage") return wakeMessage end + function obj.setWakeMessage(message) -- Set the wake-up message. - --STUB cprint("modem.setWakeMessage",message) compCheckArg(1,message,"string","nil") wakeMessage = message end + function obj.close(port) -- Closes the specified port (default: all ports). Returns true if ports were closed. - --STUB cprint("modem.close",port) compCheckArg(1,port,"number","nil") if port ~= nil then port=checkPort(port) end - return false + + if not obj.isOpen(port) then + return false; + end + + modem_host.open_ports[port] = nil + return true end + function obj.maxPacketSize() -- Gets the maximum packet size (config setting). cprint("modem.maxPacketSize") return settings.maxNetworkPacketSize end + if wireless then function obj.getStrength() -- Get the signal strength (range) used when sending messages. - --STUB cprint("modem.getStrength") return strength end function obj.setStrength(newstrength) -- Set the signal strength (range) used when sending messages. - --STUB cprint("modem.setStrength",newstrength) compCheckArg(1,newstrength,"number") strength = newstrength end end + function obj.isOpen(port) -- Whether the specified port is open. - --STUB cprint("modem.isOpen",port) compCheckArg(1,port,"number") - return false + return modem_host.open_ports[port] ~= nil end + function obj.open(port) -- Opens the specified port. Returns true if the port was opened. - --STUB cprint("modem.open",port) compCheckArg(1,port,"number") port=checkPort(port) - return false + + if obj.isOpen(port) then + return false, "port already open" + end + + -- make sure we are connected to the message board + local ok, why = modem_host.connectMessageBoard() + + if not ok then + return false, why + end + + modem_host.open_ports[port] = true + return true end + function obj.isWireless() -- Whether this is a wireless network card. - --STUB cprint("modem.isWireless") return wireless end + function obj.broadcast(port, ...) -- Broadcasts the specified data on the specified port. - --STUB cprint("modem.broadcast",port, ...) compCheckArg(1,port,"number") port=checkPort(port) - return true + + -- we cannot broadcast unless we are connected to the message board + if not modem_host.connectMessageBoard() then + return false + end + + local packed = modem_host.createPacketArray("modem_message", 0, port, ...) + local packet = modem_host.packetArrayToPacket(packed) + return modem_host.dispatchPacket(packet) end local cec = {} diff --git a/src/main.lua b/src/main.lua index 64ac711..ca8beb6 100644 --- a/src/main.lua +++ b/src/main.lua @@ -49,6 +49,7 @@ if settings.components == nil then -- Read component files for parameter documentation settings.components = { {"gpu",nil,0,160,50,3}, + {"modem",nil,1,false}, {"eeprom",nil,9,"lua/bios.lua"}, {"filesystem",nil,7,"loot/OpenOS",true}, {"filesystem",nil,nil,"tmpfs",false}, @@ -313,6 +314,9 @@ function elsa.update(dt) table.remove(kbdcodes,1) table.insert(machine.signals,{kbdcode.type,kbdcode.addr,kbdcode.char or 0,kbdcode.code}) end + if modem_host then + modem_host.processPendingMessages() + end if #machine.signals > 0 then signal = machine.signals[1] table.remove(machine.signals, 1)