{"version":3,"sources":["../src/util/event_manager.ts","../src/parse.ts","../src/util/env.ts","../src/util/log.ts","../src/beast_handler.ts"],"sourcesContent":["\r\nexport default class EventManager {\r\n private listeners = new Map()\r\n\r\n addListener(eventName: E, callback: (data: M[E])=> void){\r\n if(!this.listeners.has(eventName as string)){\r\n this.listeners.set(eventName as string, [])\r\n }\r\n\r\n this.listeners.get(eventName as string)!.push(callback)\r\n }\r\n\r\n removeListener(eventName: E, callback: (data: M[E])=> void){\r\n if(this.listeners.has(eventName as string)){\r\n const list = this.listeners.get(eventName as string)\r\n\r\n const index = list!.findIndex(c => c === callback)\r\n\r\n if(index !== -1){\r\n list!.splice(index, 1)\r\n }\r\n\r\n }\r\n }\r\n\r\n protected dispatch(eventName: E, data: M[E]){\r\n if(this.listeners.has(eventName as string)){\r\n const list = this.listeners.get(eventName as string)\r\n\r\n for(const l of list!){\r\n l(data)\r\n }\r\n\r\n }\r\n }\r\n}\r\n","\r\n// docs see https://wiki.jetvision.de/wiki/Mode-S_Beast:Data_Output_Formats\r\n\r\nimport * as modeSAdsbParser from 'mode-s-adsb-parser'\r\nimport {logError, logWarning} from './util/log'\r\nimport {Byte} from './util/typescript'\r\n\r\ntype BeastBinaryFrame = {\r\n format: T,\r\n bytes: Byte[]\r\n}\r\n\r\nexport type BeastParsedFrameType = BeastParsedFrameType_Mode_AC | BeastParsedFrameType_Mode_S | BeastParsedFrameType_ADSB | BeastParsedFrameType_Debug\r\ntype BeastParsedFrameType_Mode_AC = 'MODE_AC'\r\ntype BeastParsedFrameType_Mode_S = 'MODE_S'\r\ntype BeastParsedFrameType_ADSB = 'ADSB'\r\ntype BeastParsedFrameType_Debug = 'DEBUG'\r\n\r\nexport type BeastParsedFrame = {\r\n type: T,\r\n mlatTimestamp: number\r\n signalLevel: Byte\r\n dataBytes: Byte[]\r\n}\r\n\r\nexport function parseBeastSocketData(data: Buffer, ignoreInvalid?: boolean){\r\n\r\n const frames = parseBeastLine(data, ignoreInvalid)\r\n\r\n const parsedFrames: BeastParsedFrame[]= []\r\n for(const frame of frames){\r\n try {\r\n parsedFrames.push(parseBeastFrame(frame))\r\n } catch (err){\r\n if(ignoreInvalid){\r\n //ignore\r\n logWarning('ignoring invalid frame', frame.format, frame.bytes)\r\n } else {\r\n throw err\r\n }\r\n }\r\n }\r\n return parsedFrames\r\n}\r\n\r\n\r\nconst ESCAPE_BYTE = 0x1a\r\n\r\nconst BEAST_BINARY_FRAME_FORMAT_MODE_AC: BeastBinaryFrameFormat_Mode_AC = 0x31\r\nconst BEAST_BINARY_FRAME_FORMAT_MODE_S_SHORT: BeastBinaryFrameFormat_Mode_S = 0x32\r\nconst BEAST_BINARY_FRAME_FORMAT_MODE_S_LONG: BeastBinaryFrameFormat_ADSB = 0x33\r\nconst BEAST_BINARY_FRAME_FORMAT_DEBUG: BeastBinaryFrameFormat_Debug = 0x34\r\n\r\n// just the content, no escape bytes, no frame format bytes\r\nconst BEAST_BINARY_FRAME_CONTENT_LENGTHS: Record= {\r\n 0x31: 6 + 1 + 2,\r\n 0x32: 6 + 1 + 7,\r\n 0x33: 6 + 1 + 14,\r\n 0x34: 6 + 1 + 1 //TODO is this correct? documentation is unclear https://wiki.jetvision.de/wiki/Mode-S_Beast:Data_Output_Formats\r\n}\r\n\r\ntype BeastBinaryFrameFormat = BeastBinaryFrameFormat_Mode_AC | BeastBinaryFrameFormat_Mode_S | BeastBinaryFrameFormat_ADSB | BeastBinaryFrameFormat_Debug\r\ntype BeastBinaryFrameFormat_Mode_AC = 0x31\r\ntype BeastBinaryFrameFormat_Mode_S = 0x32\r\ntype BeastBinaryFrameFormat_ADSB = 0x33\r\ntype BeastBinaryFrameFormat_Debug = 0x34\r\n\r\nconst BEAST_BINARY_FRAME_TYPES: Record = {\r\n '49': 'MODE_AC',\r\n '50': 'MODE_S',\r\n '51': 'ADSB',\r\n '52': 'DEBUG'\r\n}\r\n\r\n\r\nclass FormatError extends Error {\r\n constructor(message: string){\r\n super(message)\r\n }\r\n}\r\n\r\nclass FormatErrorWithByteIndex extends Error {\r\n constructor(message: string, byteIndex: number){\r\n super(message + ' at byte ' + byteIndex)\r\n }\r\n}\r\n\r\n\r\n/**\r\n *\r\n * @returns messages contained in that line (already unescaped)\r\n */\r\nexport function parseBeastLine(bytes: Buffer, ignoreInvalid?: boolean){\r\n\r\n /* for documentation see\r\n\r\n https://wiki.jetvision.de/wiki/Mode-S_Beast:Data_Output_Formats\r\n https://github.com/denzen84/dump1090/blob/master/sdr_beast.c @ static int copyBinMessageSafe()\r\n */\r\n\r\n\r\n const frames: BeastBinaryFrame[] = [] // TODO is this efficient? shouldnt we use some kind of Buffer?\r\n\r\n if(bytes[0] !== ESCAPE_BYTE){\r\n if(ignoreInvalid){\r\n return []\r\n } else {\r\n throw new FormatErrorWithByteIndex('first byte is not an escape byte', 0)\r\n }\r\n }\r\n\r\n let currentFrameBytes: Byte[] = []\r\n let currentFrameFormat: BeastBinaryFrameFormat\r\n\r\n for(let byteIndex = 0; byteIndex < bytes.length; byteIndex++){\r\n const byte = bytes[byteIndex] as Byte\r\n\r\n if(currentFrameBytes.length === 0 && typeof currentFrameFormat !== 'number' && byte !== ESCAPE_BYTE){\r\n if(ignoreInvalid){\r\n break\r\n } else {\r\n throw new FormatErrorWithByteIndex('first byte of frame is not an escape byte', byteIndex)\r\n }\r\n }\r\n\r\n if(byte === ESCAPE_BYTE){\r\n const nextByteIndex = byteIndex+1\r\n if(bytes.length <= nextByteIndex){\r\n if(ignoreInvalid){\r\n break\r\n } else {\r\n throw new FormatErrorWithByteIndex('unexpected escape byte at the very end', byteIndex)\r\n }\r\n }\r\n\r\n const nextByte = bytes[nextByteIndex] as Byte\r\n\r\n if(nextByte === ESCAPE_BYTE){\r\n currentFrameBytes.push(nextByte)\r\n } else if(nextByte === BEAST_BINARY_FRAME_FORMAT_MODE_AC || nextByte === BEAST_BINARY_FRAME_FORMAT_MODE_S_SHORT || nextByte === BEAST_BINARY_FRAME_FORMAT_MODE_S_LONG || nextByte === BEAST_BINARY_FRAME_FORMAT_DEBUG){\r\n // new message starts\r\n\r\n if(currentFrameBytes.length > 0){\r\n makeFrameAndCleanup()\r\n }\r\n\r\n currentFrameFormat = nextByte\r\n } else {\r\n if(ignoreInvalid){\r\n currentFrameBytes.push(nextByte)\r\n } else {\r\n throw new FormatErrorWithByteIndex('unexpected escape byte (the following byte ' + (byteIndex+1) + ' does not need escaping)', byteIndex)\r\n }\r\n }\r\n\r\n byteIndex += 1 //skip processing of next byte\r\n } else {\r\n currentFrameBytes.push(byte)\r\n }\r\n }\r\n\r\n if(currentFrameBytes.length > 0){\r\n makeFrameAndCleanup()\r\n }\r\n\r\n function makeFrameAndCleanup(){\r\n if(typeof currentFrameFormat !== 'number'){\r\n if(ignoreInvalid){\r\n cleanup()\r\n return\r\n } else {\r\n throw new FormatError('can not make message, currentFrameFormat is undefined')\r\n }\r\n }\r\n\r\n const expectedFrameContentLength = BEAST_BINARY_FRAME_CONTENT_LENGTHS[currentFrameFormat]\r\n if(currentFrameBytes.length !== expectedFrameContentLength){\r\n if(ignoreInvalid){\r\n cleanup()\r\n return\r\n } else {\r\n logError(currentFrameBytes, Buffer.from(currentFrameBytes).toString('ascii'))\r\n throw new FormatError('invalid content byte length for frame type \"' + String.fromCharCode(currentFrameFormat) + '\": ' + currentFrameBytes.length + ' (expected ' + expectedFrameContentLength + ')')\r\n }\r\n }\r\n\r\n let allBytesAreNull = true\r\n for(const byte of currentFrameBytes){\r\n if(byte !== 0){\r\n allBytesAreNull = false\r\n break\r\n }\r\n }\r\n\r\n //skip empty frames\r\n if(!allBytesAreNull){\r\n frames.push({\r\n format: currentFrameFormat,\r\n bytes: currentFrameBytes\r\n })\r\n }\r\n\r\n cleanup()\r\n\r\n function cleanup(){\r\n\r\n currentFrameBytes = []\r\n currentFrameFormat = undefined\r\n }\r\n }\r\n\r\n return frames\r\n}\r\n\r\n\r\nexport function parseBeastFrame(frame: BeastBinaryFrame) : BeastParsedFrame {\r\n\r\n const dataBytes = frame.bytes.slice(7)\r\n const mlatTimestamp = modeSAdsbParser.util.bits_and_bytes.bitStringToUnsignedIntegerSafeRangeFromBits(modeSAdsbParser.util.bits_and_bytes.bytesToFullBitString(frame.bytes.slice(0, 6)), 6*8, 'mlatTimestamp')\r\n const signalLevel = frame.bytes[6]\r\n\r\n if(frame.format < 49 || frame.format > 52){\r\n throw new Error('unexpected frame.format: ' + frame.format)\r\n }\r\n\r\n return {\r\n type: BEAST_BINARY_FRAME_TYPES[frame.format],\r\n mlatTimestamp,\r\n signalLevel,\r\n dataBytes\r\n }\r\n}\r\n\r\n","export function isDevEnvironment(){\r\n return process.env.NODE_ENV !== 'production'\r\n}\r\n","import { isDevEnvironment } from \"./env\"\r\n\r\nexport function logsAreEnabled(){\r\n return isDevEnvironment()\r\n}\r\n\r\nexport function logError(...args: any){\r\n if(logsAreEnabled()){\r\n console.error.apply(null, args)\r\n }\r\n}\r\n\r\nexport function logWarning(...args: any){\r\n if(logsAreEnabled()){\r\n console.warn.apply(null, args)\r\n }\r\n}\r\n","import EventManager from \"./util/event_manager\";\r\nimport {BeastParsedFrame, BeastParsedFrameType, parseBeastSocketData} from './parse'\r\nimport { decodeBasics, parseADSB, parseModeS, calculateUnambigiousLocation, CprData } from \"mode-s-adsb-parser\";\r\n\r\nexport type AircraftData = {\r\n icaoAddress: AircraftIcaoAddress\r\n}\r\n\r\nexport interface AircraftDataWithLocation extends AircraftData {\r\n location: {\r\n latitude: number\r\n longitude: number\r\n }\r\n}\r\n\r\nexport type BeastHandlerEvents = {\r\n 'aircraft_new': AircraftData // first time we see a message from this aircraft (aircraft not in the cache)\r\n 'aircraft_update': AircraftData // received message from aircraft\r\n 'aircraft_update_with_location': AircraftDataWithLocation // received message from aircraft and we can locate it\r\n 'warning': {message: string, context: any}\r\n 'removed_from_cache': AircraftIcaoAddress // no message received from this aircraft for some time\r\n}\r\n\r\ntype AircraftIcaoAddress = string\r\n\r\ntype EncodedCprData = {\r\n receivedTime: number\r\n cpr: CprData\r\n}\r\n\r\ntype AircraftCacheData = {\r\n lastDataReceivedTime: number\r\n lastUnambigiousLocation?: {\r\n latitude: number\r\n longitude: number\r\n }\r\n lastEncodedLocationOdd?: EncodedCprData\r\n lastEncodedLocationEven?: EncodedCprData\r\n}\r\n\r\nconst MAX_AIRCRAFT_CACHE_TIME = 1000 * 60 * 30 // 30 minutes\r\n\r\nexport class BeastHandler extends EventManager {\r\n\r\n private readonly aircraftCache = new Map()\r\n private cleanUpCacheInterval: NodeJS.Timeout\r\n\r\n /**\r\n * don't forget to call stop() once you are done\r\n */\r\n constructor(){\r\n super()\r\n\r\n this.cleanUpCacheInterval = setInterval(()=>{\r\n this.cleanUpCache()\r\n }, 1000 * 30)\r\n }\r\n\r\n stop(){\r\n clearInterval(this.cleanUpCacheInterval)\r\n this.aircraftCache.clear()\r\n }\r\n\r\n //TODO rewrite to be non-blocking\r\n private cleanUpCache(){\r\n\r\n const now = Date.now()\r\n\r\n for(const aircraftEntry of this.aircraftCache){\r\n const aircraft = aircraftEntry[1]\r\n\r\n if(now - aircraft.lastDataReceivedTime > MAX_AIRCRAFT_CACHE_TIME){\r\n const icaoAddress = aircraftEntry[0]\r\n this.aircraftCache.delete(icaoAddress)\r\n\r\n this.dispatch('removed_from_cache', icaoAddress)\r\n }\r\n }\r\n }\r\n\r\n\r\n handleBeastData(data: Buffer){\r\n const frames = parseBeastSocketData(data, true)\r\n\r\n for(const frame of frames){\r\n this.handleBeastFrame(frame)\r\n }\r\n }\r\n\r\n private handleBeastFrame(frame: BeastParsedFrame){\r\n if(frame.type === 'ADSB'){\r\n try {\r\n const parsedModeS = parseModeS(frame.dataBytes)\r\n const parsedADSB = parseADSB(parsedModeS)\r\n\r\n const myIcaoAddressHex = icaoNumberToHex(parsedModeS.icaoAddress)\r\n\r\n const existingAircraft = this.aircraftCache.get(myIcaoAddressHex)\r\n const aircraft: AircraftCacheData = existingAircraft || {\r\n lastDataReceivedTime: Date.now()\r\n }\r\n\r\n this.aircraftCache.set(myIcaoAddressHex, aircraft)\r\n\r\n const decodedBasics = decodeBasics(parsedADSB)\r\n\r\n if(decodedBasics.locationInformation.locationAvailable){\r\n if(decodedBasics.locationInformation.location.format === 'even'){\r\n aircraft.lastEncodedLocationEven = {\r\n receivedTime: Date.now(),//TODO shouldnt we use mlatTimestamp for this?\r\n cpr: decodedBasics.locationInformation.location\r\n }\r\n } else {\r\n aircraft.lastEncodedLocationOdd = {\r\n receivedTime: Date.now(),//TODO shouldnt we use mlatTimestamp for this?\r\n cpr: decodedBasics.locationInformation.location\r\n }\r\n }\r\n }\r\n\r\n if(aircraft.lastEncodedLocationEven && aircraft.lastEncodedLocationOdd){\r\n if(Math.abs(aircraft.lastEncodedLocationEven.receivedTime - aircraft.lastEncodedLocationOdd.receivedTime) < 1000 * 60 * 2){// 2 minutes\r\n\r\n const olderMessage = aircraft.lastEncodedLocationEven.receivedTime < aircraft.lastEncodedLocationOdd.receivedTime ? aircraft.lastEncodedLocationEven.cpr : aircraft.lastEncodedLocationOdd.cpr\r\n\r\n const moreRecentMessage = aircraft.lastEncodedLocationEven.receivedTime < aircraft.lastEncodedLocationOdd.receivedTime ? aircraft.lastEncodedLocationOdd.cpr : aircraft.lastEncodedLocationEven.cpr\r\n\r\n const unambigiousLocation = calculateUnambigiousLocation([olderMessage, moreRecentMessage])\r\n\r\n aircraft.lastUnambigiousLocation = unambigiousLocation\r\n\r\n this.dispatch('aircraft_update_with_location', {\r\n icaoAddress: myIcaoAddressHex,\r\n location: unambigiousLocation\r\n })\r\n }\r\n }\r\n\r\n\r\n\r\n if(!existingAircraft){\r\n this.dispatch('aircraft_new', {\r\n icaoAddress: myIcaoAddressHex\r\n })\r\n } else {\r\n if(!aircraft.lastUnambigiousLocation){\r\n this.dispatch('aircraft_update', {\r\n icaoAddress: myIcaoAddressHex\r\n })\r\n }\r\n }\r\n\r\n } catch (err){\r\n this.dispatch('warning', {\r\n message: 'Failed to decode adsb frame',\r\n context: err\r\n })\r\n }\r\n } else if(frame.type === 'MODE_S') {\r\n try {\r\n const parsedModeS = parseModeS(frame.dataBytes)\r\n\r\n const myIcaoAddressHex = icaoNumberToHex(parsedModeS.icaoAddress)\r\n\r\n const existingAircraft = this.aircraftCache.get(myIcaoAddressHex)\r\n const aircraft: AircraftCacheData = existingAircraft || {\r\n lastDataReceivedTime: Date.now()\r\n }\r\n\r\n this.aircraftCache.set(myIcaoAddressHex, aircraft)\r\n\r\n if(existingAircraft){\r\n this.dispatch('aircraft_update', {\r\n icaoAddress: myIcaoAddressHex\r\n })\r\n } else {\r\n this.dispatch('aircraft_new', {\r\n icaoAddress: myIcaoAddressHex\r\n })\r\n }\r\n\r\n } catch (err){\r\n this.dispatch('warning', {\r\n message: 'Failed to decode mode s frame',\r\n context: err\r\n })\r\n }\r\n } else {\r\n this.dispatch('warning', {\r\n message: 'Unsupported frame type',\r\n context: frame.type\r\n })\r\n }\r\n }\r\n\r\n}\r\n\r\nfunction icaoNumberToHex(n: number){\r\n return 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