520 lines
18 KiB
Swift
520 lines
18 KiB
Swift
import ClawdbotKit
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import Foundation
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import Network
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import Observation
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import OSLog
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@MainActor
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@Observable
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final class GatewayDiscoveryModel {
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struct LocalIdentity: Equatable {
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var hostTokens: Set<String>
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var displayTokens: Set<String>
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}
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struct DiscoveredGateway: Identifiable, Equatable {
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var id: String { self.stableID }
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var displayName: String
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var lanHost: String?
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var tailnetDns: String?
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var sshPort: Int
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var gatewayPort: Int?
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var cliPath: String?
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var stableID: String
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var debugID: String
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var isLocal: Bool
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}
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var gateways: [DiscoveredGateway] = []
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var statusText: String = "Idle"
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private var browsers: [String: NWBrowser] = [:]
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private var resultsByDomain: [String: Set<NWBrowser.Result>] = [:]
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private var gatewaysByDomain: [String: [DiscoveredGateway]] = [:]
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private var statesByDomain: [String: NWBrowser.State] = [:]
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private var localIdentity: LocalIdentity
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private var resolvedTXTByID: [String: [String: String]] = [:]
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private var pendingTXTResolvers: [String: GatewayTXTResolver] = [:]
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private let logger = Logger(subsystem: "com.clawdbot", category: "gateway-discovery")
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init() {
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self.localIdentity = Self.buildLocalIdentityFast()
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self.refreshLocalIdentity()
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}
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func start() {
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if !self.browsers.isEmpty { return }
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for domain in ClawdbotBonjour.bridgeServiceDomains {
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let params = NWParameters.tcp
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params.includePeerToPeer = true
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let browser = NWBrowser(
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for: .bonjour(type: ClawdbotBonjour.bridgeServiceType, domain: domain),
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using: params)
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browser.stateUpdateHandler = { [weak self] state in
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Task { @MainActor in
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guard let self else { return }
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self.statesByDomain[domain] = state
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self.updateStatusText()
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}
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}
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browser.browseResultsChangedHandler = { [weak self] results, _ in
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Task { @MainActor in
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guard let self else { return }
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self.resultsByDomain[domain] = results
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self.updateGateways(for: domain)
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self.recomputeGateways()
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}
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}
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self.browsers[domain] = browser
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browser.start(queue: DispatchQueue(label: "com.clawdbot.macos.gateway-discovery.\(domain)"))
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}
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}
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func stop() {
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for browser in self.browsers.values {
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browser.cancel()
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}
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self.browsers = [:]
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self.resultsByDomain = [:]
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self.gatewaysByDomain = [:]
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self.statesByDomain = [:]
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self.resolvedTXTByID = [:]
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self.pendingTXTResolvers.values.forEach { $0.cancel() }
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self.pendingTXTResolvers = [:]
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self.gateways = []
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self.statusText = "Stopped"
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}
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private func recomputeGateways() {
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self.gateways = self.gatewaysByDomain.values
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.flatMap(\.self)
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.filter { !$0.isLocal }
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.sorted { $0.displayName.localizedCaseInsensitiveCompare($1.displayName) == .orderedAscending }
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}
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private func updateGateways(for domain: String) {
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guard let results = self.resultsByDomain[domain] else {
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self.gatewaysByDomain[domain] = []
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return
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}
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self.gatewaysByDomain[domain] = results.compactMap { result -> DiscoveredGateway? in
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guard case let .service(name, type, resultDomain, _) = result.endpoint else { return nil }
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let decodedName = BonjourEscapes.decode(name)
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let stableID = BridgeEndpointID.stableID(result.endpoint)
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let resolvedTXT = self.resolvedTXTByID[stableID] ?? [:]
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let txt = Self.txtDictionary(from: result).merging(
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resolvedTXT,
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uniquingKeysWith: { _, new in new })
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let advertisedName = txt["displayName"]
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.map(Self.prettifyInstanceName)
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.flatMap { $0.isEmpty ? nil : $0 }
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let prettyName =
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advertisedName ?? Self.prettifyServiceName(decodedName)
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let parsedTXT = Self.parseGatewayTXT(txt)
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if parsedTXT.lanHost == nil || parsedTXT.tailnetDns == nil {
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self.ensureTXTResolution(
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stableID: stableID,
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serviceName: name,
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type: type,
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domain: resultDomain)
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}
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let isLocal = Self.isLocalGateway(
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lanHost: parsedTXT.lanHost,
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tailnetDns: parsedTXT.tailnetDns,
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displayName: prettyName,
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serviceName: decodedName,
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local: self.localIdentity)
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return DiscoveredGateway(
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displayName: prettyName,
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lanHost: parsedTXT.lanHost,
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tailnetDns: parsedTXT.tailnetDns,
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sshPort: parsedTXT.sshPort,
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gatewayPort: parsedTXT.gatewayPort,
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cliPath: parsedTXT.cliPath,
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stableID: stableID,
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debugID: BridgeEndpointID.prettyDescription(result.endpoint),
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isLocal: isLocal)
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}
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.sorted { $0.displayName.localizedCaseInsensitiveCompare($1.displayName) == .orderedAscending }
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}
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private func updateGatewaysForAllDomains() {
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for domain in self.resultsByDomain.keys {
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self.updateGateways(for: domain)
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}
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}
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private func updateStatusText() {
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let states = Array(self.statesByDomain.values)
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if states.isEmpty {
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self.statusText = self.browsers.isEmpty ? "Idle" : "Setup"
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return
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}
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if let failed = states.first(where: { state in
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if case .failed = state { return true }
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return false
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}) {
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if case let .failed(err) = failed {
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self.statusText = "Failed: \(err)"
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return
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}
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}
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if let waiting = states.first(where: { state in
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if case .waiting = state { return true }
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return false
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}) {
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if case let .waiting(err) = waiting {
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self.statusText = "Waiting: \(err)"
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return
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}
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}
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if states.contains(where: { if case .ready = $0 { true } else { false } }) {
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self.statusText = "Searching…"
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return
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}
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if states.contains(where: { if case .setup = $0 { true } else { false } }) {
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self.statusText = "Setup"
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return
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}
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self.statusText = "Searching…"
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}
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private static func txtDictionary(from result: NWBrowser.Result) -> [String: String] {
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var merged: [String: String] = [:]
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if case let .bonjour(txt) = result.metadata {
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merged.merge(txt.dictionary, uniquingKeysWith: { _, new in new })
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}
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if let endpointTxt = result.endpoint.txtRecord?.dictionary {
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merged.merge(endpointTxt, uniquingKeysWith: { _, new in new })
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}
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return merged
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}
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struct GatewayTXT: Equatable {
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var lanHost: String?
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var tailnetDns: String?
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var sshPort: Int
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var gatewayPort: Int?
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var cliPath: String?
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}
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static func parseGatewayTXT(_ txt: [String: String]) -> GatewayTXT {
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var lanHost: String?
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var tailnetDns: String?
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var sshPort = 22
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var gatewayPort: Int?
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var cliPath: String?
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if let value = txt["lanHost"] {
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let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines)
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lanHost = trimmed.isEmpty ? nil : trimmed
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}
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if let value = txt["tailnetDns"] {
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let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines)
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tailnetDns = trimmed.isEmpty ? nil : trimmed
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}
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if let value = txt["sshPort"],
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let parsed = Int(value.trimmingCharacters(in: .whitespacesAndNewlines)),
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parsed > 0
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{
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sshPort = parsed
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}
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if let value = txt["gatewayPort"],
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let parsed = Int(value.trimmingCharacters(in: .whitespacesAndNewlines)),
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parsed > 0
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{
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gatewayPort = parsed
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}
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if let value = txt["cliPath"] {
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let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines)
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cliPath = trimmed.isEmpty ? nil : trimmed
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}
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return GatewayTXT(
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lanHost: lanHost,
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tailnetDns: tailnetDns,
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sshPort: sshPort,
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gatewayPort: gatewayPort,
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cliPath: cliPath)
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}
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static func buildSSHTarget(user: String, host: String, port: Int) -> String {
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var target = "\(user)@\(host)"
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if port != 22 {
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target += ":\(port)"
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}
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return target
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}
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private func ensureTXTResolution(
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stableID: String,
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serviceName: String,
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type: String,
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domain: String)
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{
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guard self.resolvedTXTByID[stableID] == nil else { return }
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guard self.pendingTXTResolvers[stableID] == nil else { return }
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let resolver = GatewayTXTResolver(
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name: serviceName,
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type: type,
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domain: domain,
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logger: self.logger)
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{ [weak self] result in
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Task { @MainActor in
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guard let self else { return }
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self.pendingTXTResolvers[stableID] = nil
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switch result {
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case let .success(txt):
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self.resolvedTXTByID[stableID] = txt
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self.updateGatewaysForAllDomains()
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self.recomputeGateways()
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case .failure:
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break
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}
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}
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}
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self.pendingTXTResolvers[stableID] = resolver
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resolver.start()
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}
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private nonisolated static func prettifyInstanceName(_ decodedName: String) -> String {
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let normalized = decodedName.split(whereSeparator: \.isWhitespace).joined(separator: " ")
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let stripped = normalized.replacingOccurrences(of: " (Clawdbot)", with: "")
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.replacingOccurrences(of: #"\s+\(\d+\)$"#, with: "", options: .regularExpression)
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return stripped.trimmingCharacters(in: .whitespacesAndNewlines)
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}
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private nonisolated static func prettifyServiceName(_ decodedName: String) -> String {
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let normalized = Self.prettifyInstanceName(decodedName)
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var cleaned = normalized.replacingOccurrences(of: #"\s*-?bridge$"#, with: "", options: .regularExpression)
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cleaned = cleaned
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.replacingOccurrences(of: "_", with: " ")
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.replacingOccurrences(of: "-", with: " ")
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.replacingOccurrences(of: #"\s+"#, with: " ", options: .regularExpression)
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.trimmingCharacters(in: .whitespacesAndNewlines)
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if cleaned.isEmpty {
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cleaned = normalized
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}
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let words = cleaned.split(separator: " ")
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let titled = words.map { word -> String in
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let lower = word.lowercased()
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guard let first = lower.first else { return "" }
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return String(first).uppercased() + lower.dropFirst()
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}.joined(separator: " ")
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return titled.isEmpty ? normalized : titled
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}
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nonisolated static func isLocalGateway(
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lanHost: String?,
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tailnetDns: String?,
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displayName: String?,
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serviceName: String?,
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local: LocalIdentity) -> Bool
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{
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if let host = normalizeHostToken(lanHost),
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local.hostTokens.contains(host)
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{
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return true
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}
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if let host = normalizeHostToken(tailnetDns),
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local.hostTokens.contains(host)
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{
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return true
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}
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if let name = normalizeDisplayToken(displayName),
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local.displayTokens.contains(name)
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{
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return true
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}
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if let service = normalizeServiceToken(serviceName) {
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for token in local.hostTokens where service.contains(token) {
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return true
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}
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}
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return false
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}
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private func refreshLocalIdentity() {
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let fastIdentity = self.localIdentity
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Task.detached(priority: .utility) {
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let slowIdentity = Self.buildLocalIdentitySlow()
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let merged = Self.mergeLocalIdentity(fast: fastIdentity, slow: slowIdentity)
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await MainActor.run { [weak self] in
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guard let self else { return }
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guard self.localIdentity != merged else { return }
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self.localIdentity = merged
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self.recomputeGateways()
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}
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}
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}
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private nonisolated static func mergeLocalIdentity(
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fast: LocalIdentity,
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slow: LocalIdentity) -> LocalIdentity
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{
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LocalIdentity(
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hostTokens: fast.hostTokens.union(slow.hostTokens),
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displayTokens: fast.displayTokens.union(slow.displayTokens))
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}
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private nonisolated static func buildLocalIdentityFast() -> LocalIdentity {
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var hostTokens: Set<String> = []
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var displayTokens: Set<String> = []
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let hostName = ProcessInfo.processInfo.hostName
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if let token = normalizeHostToken(hostName) {
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hostTokens.insert(token)
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}
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if let token = normalizeDisplayToken(InstanceIdentity.displayName) {
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displayTokens.insert(token)
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}
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return LocalIdentity(hostTokens: hostTokens, displayTokens: displayTokens)
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}
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private nonisolated static func buildLocalIdentitySlow() -> LocalIdentity {
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var hostTokens: Set<String> = []
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var displayTokens: Set<String> = []
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if let host = Host.current().name,
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let token = normalizeHostToken(host)
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{
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hostTokens.insert(token)
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}
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if let token = normalizeDisplayToken(Host.current().localizedName) {
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displayTokens.insert(token)
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}
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return LocalIdentity(hostTokens: hostTokens, displayTokens: displayTokens)
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}
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private nonisolated static func normalizeHostToken(_ raw: String?) -> String? {
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guard let raw else { return nil }
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let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
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if trimmed.isEmpty { return nil }
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let lower = trimmed.lowercased()
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let strippedTrailingDot = lower.hasSuffix(".")
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? String(lower.dropLast())
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: lower
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let withoutLocal = strippedTrailingDot.hasSuffix(".local")
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? String(strippedTrailingDot.dropLast(6))
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: strippedTrailingDot
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let firstLabel = withoutLocal.split(separator: ".").first.map(String.init)
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let token = (firstLabel ?? withoutLocal).trimmingCharacters(in: .whitespacesAndNewlines)
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return token.isEmpty ? nil : token
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}
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private nonisolated static func normalizeDisplayToken(_ raw: String?) -> String? {
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guard let raw else { return nil }
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let prettified = Self.prettifyInstanceName(raw)
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let trimmed = prettified.trimmingCharacters(in: .whitespacesAndNewlines)
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if trimmed.isEmpty { return nil }
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return trimmed.lowercased()
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}
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private nonisolated static func normalizeServiceToken(_ raw: String?) -> String? {
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guard let raw else { return nil }
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let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
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if trimmed.isEmpty { return nil }
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return trimmed.lowercased()
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}
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}
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final class GatewayTXTResolver: NSObject, NetServiceDelegate {
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private let service: NetService
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private let completion: (Result<[String: String], Error>) -> Void
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private let logger: Logger
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private var didFinish = false
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init(
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name: String,
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type: String,
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domain: String,
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logger: Logger,
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completion: @escaping (Result<[String: String], Error>) -> Void)
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{
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self.service = NetService(domain: domain, type: type, name: name)
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self.completion = completion
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self.logger = logger
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super.init()
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self.service.delegate = self
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}
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func start(timeout: TimeInterval = 2.0) {
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self.service.schedule(in: .main, forMode: .common)
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self.service.resolve(withTimeout: timeout)
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}
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func cancel() {
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self.finish(result: .failure(GatewayTXTResolverError.cancelled))
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}
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func netServiceDidResolveAddress(_ sender: NetService) {
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let txt = Self.decodeTXT(sender.txtRecordData())
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if !txt.isEmpty {
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let payload = self.formatTXT(txt)
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self.logger.debug(
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"discovery: resolved TXT for \(sender.name, privacy: .public): \(payload, privacy: .public)")
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}
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self.finish(result: .success(txt))
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}
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func netService(_ sender: NetService, didNotResolve errorDict: [String: NSNumber]) {
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self.finish(result: .failure(GatewayTXTResolverError.resolveFailed(errorDict)))
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}
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private func finish(result: Result<[String: String], Error>) {
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guard !self.didFinish else { return }
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self.didFinish = true
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self.service.stop()
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self.service.remove(from: .main, forMode: .common)
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self.completion(result)
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}
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private static func decodeTXT(_ data: Data?) -> [String: String] {
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guard let data else { return [:] }
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let dict = NetService.dictionary(fromTXTRecord: data)
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var out: [String: String] = [:]
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out.reserveCapacity(dict.count)
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for (key, value) in dict {
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if let str = String(data: value, encoding: .utf8) {
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out[key] = str
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}
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}
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return out
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}
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private func formatTXT(_ txt: [String: String]) -> String {
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txt.sorted(by: { $0.key < $1.key })
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.map { "\($0.key)=\($0.value)" }
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.joined(separator: " ")
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}
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}
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enum GatewayTXTResolverError: Error {
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case cancelled
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case resolveFailed([String: NSNumber])
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}
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