63 lines
2.1 KiB
Swift
63 lines
2.1 KiB
Swift
import SystemConfiguration
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#if !PMKCocoaPods
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import PromiseKit
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#endif
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public extension SCNetworkReachability {
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enum PMKError: Error {
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case couldNotInitializeReachability
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}
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static func promise() -> Promise<Void> {
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do {
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var zeroAddress = sockaddr()
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zeroAddress.sa_len = UInt8(MemoryLayout<sockaddr>.size)
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zeroAddress.sa_family = sa_family_t(AF_INET)
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guard let ref = SCNetworkReachabilityCreateWithAddress(nil, &zeroAddress) else {
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throw PMKError.couldNotInitializeReachability
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}
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var flags = SCNetworkReachabilityFlags()
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if SCNetworkReachabilityGetFlags(ref, &flags), flags.contains(.reachable) {
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return Promise()
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}
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return try Helper(ref: ref).pending.promise
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} catch {
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return Promise(error: error)
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}
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}
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}
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private func callback(reachability: SCNetworkReachability, flags: SCNetworkReachabilityFlags, info: UnsafeMutableRawPointer?) {
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if let info = info, flags.contains(.reachable) {
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Unmanaged<Helper>.fromOpaque(info).takeUnretainedValue().pending.resolver.fulfill(())
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}
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}
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private class Helper {
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let pending = Promise<Void>.pending()
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let ref: SCNetworkReachability
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init(ref: SCNetworkReachability) throws {
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self.ref = ref
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var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil)
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context.info = UnsafeMutableRawPointer(Unmanaged<Helper>.passUnretained(self).toOpaque())
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guard SCNetworkReachabilitySetCallback(ref, callback, &context) else {
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throw SCNetworkReachability.PMKError.couldNotInitializeReachability
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}
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guard SCNetworkReachabilitySetDispatchQueue(ref, .main) else {
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SCNetworkReachabilitySetCallback(ref, nil, nil)
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throw SCNetworkReachability.PMKError.couldNotInitializeReachability
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}
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_ = pending.promise.ensure {
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SCNetworkReachabilitySetCallback(self.ref, nil, nil)
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SCNetworkReachabilitySetDispatchQueue(self.ref, nil)
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}
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}
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}
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