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import Foundation
import Network
enum HotlineClientStatus: Int {
case disconnected
case connecting
case connected
}
class HotlineClient : ObservableObject {
static let shared = HotlineClient()
static let handshakePacket = Data([
0x54, 0x52, 0x54, 0x50, // 'TRTP' protocol ID
0x48, 0x4F, 0x54, 0x4C, // Sub-protocol ID
0x00, 0x01, // Version
0x00, 0x02, // Sub-version
])
@Published var connectionStatus: HotlineClientStatus = .disconnected
var server: HotlineServer?
var connection: NWConnection?
var bytes = Data()
var handshakeComplete = false
init() {
}
func connect(to server: HotlineServer) {
self.server = server
let serverAddress = NWEndpoint.Host(server.address)
let serverPort = NWEndpoint.Port(rawValue: server.port)!
self.connection = NWConnection(host: serverAddress, port: serverPort, using: .tcp)
self.connection?.stateUpdateHandler = { [weak self] (newState: NWConnection.State) in
switch newState {
case .ready:
print("HotlineClient: connection ready!")
DispatchQueue.main.async {
self?.connectionStatus = .connected
}
self?.sendHandshake()
case .cancelled:
print("HotlineClient: connection cancelled")
DispatchQueue.main.async {
self?.connectionStatus = .disconnected
}
case .failed(let err):
print("HotlineClient: connection error \(err)")
DispatchQueue.main.async {
self?.connectionStatus = .disconnected
}
default:
print("HotlineClient: unhandled connection state \(newState)")
}
}
DispatchQueue.main.async {
self.connectionStatus = .connecting
}
self.connection?.start(queue: .global())
}
private func disconnect() {
guard let c = connection else {
print("HotlineClient: already disconnected")
return
}
c.cancel()
self.connection = nil
}
private func sendHandshake() {
guard let c = connection else {
print("HotlineClient: invalid connection to send handshake.")
return
}
c.send(content: HotlineClient.handshakePacket, completion: .contentProcessed { [weak self] (error) in
if let err = error {
print("HotlineClient: sending magic failed \(err)")
return
}
print("HotlineClient: sent handshake packet!")
self?.receiveHandshake()
})
}
private func receiveHandshake() {
guard let c = connection else {
print("HotlineTracker: invalid connection to receive magic.")
return
}
print("HotlineClient: receiving handshake...")
c.receive(minimumIncompleteLength: 8, maximumLength: 8) { [weak self] (data, context, isComplete, error) in
guard let self = self, let data = data else {
return
}
if data.isEmpty {
print("HotlineClient: empty handshake response")
self.disconnect()
return
}
let protocolID = data.readUInt32(at: 0)!
if protocolID != 0x54525450 { // 'TRTP'
print("HotlineClient: invalid handshake protocol ID \(protocolID)")
self.disconnect()
return
}
let errorCode = data.readUInt32(at: 4)!
if errorCode != 0 { // 0 == no error
print("HotlineClient: handshake error", errorCode)
self.disconnect()
return
}
print("HotlineClient: completed handshake")
self.sendLogin()
}
}
private func sendLogin() {
guard let c = connection else {
print("HotlineClient: no connection for transaction.")
return
}
c.send(content: HotlineClient.handshakePacket, completion: .contentProcessed { [weak self] (error) in
if let err = error {
print("HotlineClient: sending login failed \(err)")
return
}
print("HotlineClient: sent handshake packet!")
})
}
private func receiveTransaction() {
guard let c = connection else {
print("HotlineClient: no connection for transaction.")
return
}
print("HotlineClient: waiting on transaction header...")
c.receive(minimumIncompleteLength: HotlineTransaction.headerSize, maximumLength: HotlineTransaction.headerSize) { [weak self] (data, context, isComplete, error) in
guard let self = self else {
return
}
if let error = error {
print("HotlineClient: receive error \(error)")
self.disconnect()
return
}
if let data = data, !data.isEmpty {
print("HotlineClient: received \(data.count) header bytes")
let transaction = self.parseTransaction(data: data)
if var t = transaction {
if t.dataSize > 0 {
c.receive(minimumIncompleteLength: Int(t.dataSize), maximumLength: Int(t.dataSize)) { [weak self] (data, context, isComplete, error) in
guard let self = self else {
return
}
if let data = data, !data.isEmpty {
t.parameterCount = data.readUInt16(at: 0)!
if t.parameterCount > 0 {
t.parameters = []
var dataCursor = 2
for _ in 0..<t.parameterCount {
if
let fieldID = data.readUInt16(at: dataCursor),
let fieldSize = data.readUInt16(at: dataCursor + 2),
let fieldData = data.readData(at: dataCursor + 4, length: Int(fieldSize)) {
t.parameters?.append(HotlineTransactionParameter(id: fieldID, dataSize: fieldSize, data: fieldData))
dataCursor += 4 + Int(fieldSize)
}
}
}
}
self.processTransaction(t)
}
}
else {
self.processTransaction(t)
}
}
// print("HotlineTracker: server count = \(self.serverCount)")
}
// self.receiveListing()
// }
}
}
private func processTransaction(_ transaction: HotlineTransaction) {
print("HotlineClient processing transaction \(transaction.type) with \(transaction.parameterCount) parameters")
}
private func parseTransaction(data: Data) -> HotlineTransaction? {
if
let flags = data.readUInt8(at: 0),
let isReply = data.readUInt8(at: 1),
let type = data.readUInt16(at: 2),
let id = data.readUInt32(at: 4),
let errorCode = data.readUInt32(at: 8),
let transactionSize = data.readUInt32(at: 12),
let dataSize = data.readUInt32(at: 16) {
return HotlineTransaction(
flags: flags,
isReply: isReply,
type: HotlineTransactionType(rawValue: type) ?? HotlineTransactionType.unknown,
id: id,
errorCode: errorCode,
totalSize: transactionSize,
dataSize: dataSize
)
}
return nil
}
}
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