240 lines
8.7 KiB
Swift
240 lines
8.7 KiB
Swift
import Foundation
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import OSLog
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import ClawdisProtocol
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struct GatewayEvent: Codable {
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let type: String
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let event: String?
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let payload: AnyCodable?
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let seq: Int?
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}
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extension Notification.Name {
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static let gatewaySnapshot = Notification.Name("clawdis.gateway.snapshot")
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static let gatewayEvent = Notification.Name("clawdis.gateway.event")
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static let gatewaySeqGap = Notification.Name("clawdis.gateway.seqgap")
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}
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private actor GatewayChannelActor {
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private let logger = Logger(subsystem: "com.steipete.clawdis", category: "gateway")
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private var task: URLSessionWebSocketTask?
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private var pending: [String: CheckedContinuation<GatewayFrame, Error>] = [:]
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private var connected = false
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private var url: URL
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private var token: String?
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private let session = URLSession(configuration: .default)
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private var backoffMs: Double = 500
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private var shouldReconnect = true
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private var lastSeq: Int?
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private var lastTick: Date?
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private var tickIntervalMs: Double = 30_000
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private let decoder = JSONDecoder()
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private let encoder = JSONEncoder()
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init(url: URL, token: String?) {
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self.url = url
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self.token = token
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}
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func connect() async throws {
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if self.connected, self.task?.state == .running { return }
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self.task?.cancel(with: .goingAway, reason: nil)
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self.task = self.session.webSocketTask(with: self.url)
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self.task?.resume()
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try await self.sendHello()
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self.listen()
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self.connected = true
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self.backoffMs = 500
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self.lastSeq = nil
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}
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private func sendHello() async throws {
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let hello: [String: Any] = [
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"type": "hello",
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"minProtocol": GATEWAY_PROTOCOL_VERSION,
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"maxProtocol": GATEWAY_PROTOCOL_VERSION,
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"client": [
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"name": "clawdis-mac",
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"version": Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "dev",
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"platform": "macos",
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"mode": "app",
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"instanceId": Host.current().localizedName ?? UUID().uuidString,
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],
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"caps": [],
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"auth": self.token != nil ? ["token": self.token!] : [:],
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]
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let data = try JSONSerialization.data(withJSONObject: hello)
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try await self.task?.send(.data(data))
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// wait for hello-ok
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if let msg = try await task?.receive() {
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if try await self.handleHelloResponse(msg) { return }
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}
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throw NSError(domain: "Gateway", code: 1, userInfo: [NSLocalizedDescriptionKey: "hello failed"])
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}
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private func handleHelloResponse(_ msg: URLSessionWebSocketTask.Message) async throws -> Bool {
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let data: Data? = switch msg {
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case let .data(d): d
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case let .string(s): s.data(using: .utf8)
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@unknown default: nil
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}
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guard let data else { return false }
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guard let obj = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
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let type = obj["type"] as? String else { return false }
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if type == "hello-ok" {
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if let policy = obj["policy"] as? [String: Any],
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let tick = policy["tickIntervalMs"] as? Double {
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self.tickIntervalMs = tick
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}
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self.lastTick = Date()
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Task { await self.watchTicks() }
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NotificationCenter.default.post(name: .gatewaySnapshot, object: nil, userInfo: obj)
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return true
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}
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return false
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}
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private func listen() {
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self.task?.receive { [weak self] result in
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guard let self else { return }
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switch result {
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case let .failure(err):
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Task { await self.handleReceiveFailure(err) }
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case let .success(msg):
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Task {
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await self.handle(msg)
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await self.listen()
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}
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}
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}
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}
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private func handleReceiveFailure(_ err: Error) async {
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self.logger.error("gateway ws receive failed \(err.localizedDescription, privacy: .public)")
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self.connected = false
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await self.scheduleReconnect()
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}
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private func handle(_ msg: URLSessionWebSocketTask.Message) async {
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let data: Data? = switch msg {
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case let .data(d): d
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case let .string(s): s.data(using: .utf8)
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@unknown default: nil
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}
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guard let data else { return }
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guard let frame = try? self.decoder.decode(GatewayFrame.self, from: data) else {
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self.logger.error("gateway decode failed")
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return
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}
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switch frame {
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case let .res(res):
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let id = res.id
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if let waiter = pending.removeValue(forKey: id) {
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waiter.resume(returning: .res(res))
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}
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case let .event(evt):
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if let seq = evt.seq {
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if let last = lastSeq, seq > last + 1 {
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NotificationCenter.default.post(
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name: .gatewaySeqGap,
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object: frame,
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userInfo: ["expected": last + 1, "received": seq])
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}
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self.lastSeq = seq
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}
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if evt.event == "tick" { self.lastTick = Date() }
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NotificationCenter.default.post(name: .gatewayEvent, object: frame)
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case .helloOk:
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self.lastTick = Date()
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NotificationCenter.default.post(name: .gatewaySnapshot, object: frame)
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default:
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break
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}
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}
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private func watchTicks() async {
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let tolerance = self.tickIntervalMs * 2
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while self.connected {
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try? await Task.sleep(nanoseconds: UInt64(tolerance * 1_000_000))
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guard self.connected else { return }
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if let last = self.lastTick {
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let delta = Date().timeIntervalSince(last) * 1000
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if delta > tolerance {
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self.logger.error("gateway tick missed; reconnecting")
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self.connected = false
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await self.scheduleReconnect()
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return
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}
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}
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}
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}
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private func scheduleReconnect() async {
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guard self.shouldReconnect else { return }
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let delay = self.backoffMs / 1000
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self.backoffMs = min(self.backoffMs * 2, 30000)
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try? await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))
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do {
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try await self.connect()
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} catch {
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self.logger.error("gateway reconnect failed \(error.localizedDescription, privacy: .public)")
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await self.scheduleReconnect()
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}
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}
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func request(method: String, params: [String: AnyCodable]?) async throws -> Data {
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try await self.connect()
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let id = UUID().uuidString
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let paramsObject = params?.reduce(into: [String: Any]()) { dict, entry in
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dict[entry.key] = entry.value.value
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} ?? [:]
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let frame: [String: Any] = [
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"type": "req",
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"id": id,
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"method": method,
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"params": paramsObject,
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]
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let data = try JSONSerialization.data(withJSONObject: frame)
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let response = try await withCheckedThrowingContinuation { (cont: CheckedContinuation<GatewayFrame, Error>) in
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self.pending[id] = cont
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Task {
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do {
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try await self.task?.send(.data(data))
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} catch {
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self.pending.removeValue(forKey: id)
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cont.resume(throwing: error)
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}
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}
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}
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guard case let .res(res) = response else {
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throw NSError(domain: "Gateway", code: 2, userInfo: [NSLocalizedDescriptionKey: "unexpected frame"])
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}
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if res.ok == false {
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let msg = (res.error?["message"]?.value as? String) ?? "gateway error"
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throw NSError(domain: "Gateway", code: 3, userInfo: [NSLocalizedDescriptionKey: msg])
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}
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if let payload = res.payload?.value {
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if JSONSerialization.isValidJSONObject(payload) {
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let payloadData = try JSONSerialization.data(withJSONObject: payload)
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return payloadData
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}
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}
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return Data()
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}
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}
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actor GatewayChannel {
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private var inner: GatewayChannelActor?
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func configure(url: URL, token: String?) {
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self.inner = GatewayChannelActor(url: url, token: token)
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}
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func request(method: String, params: [String: AnyCodable]?) async throws -> Data {
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guard let inner else {
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throw NSError(domain: "Gateway", code: 0, userInfo: [NSLocalizedDescriptionKey: "not configured"])
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}
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return try await inner.request(method: method, params: params)
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}
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}
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