We're using the Network.framework and send data between an iOS app and a macOS app. Works great. Until it doesn't.
When I stop using the iOS app for like 2-3 minutes the connections stops working.
The debug log of the macOS app says: 2020-12-01 22:40:40.274638+0100 Remote for Zoom[10750:497151] [] nwsocketgetinputframes [C4:1] recvmsg(fd 35, 9216 bytes) [61: Connection refused]
Can someone translate this into English? Tried the google traslator but...
On a more serious note, what is this and how to heal it? Does the 2-3 min pause as symptom / trigger of the above error message ring some bells?
tmiskiew
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I am trying to create a communication channel based on Bonjour NetService and URLSessionStreamTask to open the I/O stream.
I have the setup ready and I am able to connect with bonjour service and open I/O streams between mac and iOS app.
I am using swift codables for request and response, so communication is based on codable structs encoded as Data. I send a Request struct (by outputStream.write(data)) and wait for a response struct from mac app in input stream.
Problem
I am sending fetchUser request (after receiving response for loginUser), the mac app receives the request and writes the response without write failing (-1) but I'm not receiving the response in iOS app. (Although I received the response for previous loginUser request)
I'm not able to figure out where exactly the issue is. Attaching the code snippets here.
PS: I am noob at IO streams handling so a detailed response will be helpful. May be some sources where I can understand more about the topic.
Mac App code
let service: NetService = NetService(domain: "local.", type: "_my-app._tcp.", name: "test", port: 0)
service.delegate = self
service.publish(options: .listenForConnections)
//Writes response to connected output stream
	func send(response: HalloResponse) {
		do {
			let data = try encoder.encode(response)
			print("HalloServer: Response: \(String(describing: String(data: data, encoding: .utf8)))")
			if serviceDelegate.dataStream?.outputSteam.write(data: data) == -1 {
				print("HalloServer: send(response: HalloResponse) Write failied")
			}
		} catch {
			print("HalloServer: Exception in send(request: Request)")
		}
	}
//NetServiceDelegate
func netService(_ sender: NetService, didAcceptConnectionWith inputStream: InputStream, outputStream: OutputStream) {
		print("NetServiceDelegate: service - \(sender.name) inputStream - \(inputStream) outputStream \(outputStream)")
		self.inputStream = inputStream
		self.outputSteam = outputSteam
		self.inputStream.delegate = self
		self.outputSteam.delegate = self
		self.inputStream.schedule(in: .main, forMode: .default)
		self.inputStream.schedule(in: .main, forMode: .default)
		self.inputStream.open()
		self.inputStream.open()
	}
// StreamDelegate
func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
		print("StreamDelegate: handle eventCode: \(eventCode.rawValue)")
		if inputStream == aStream {
			switch eventCode {
			case .hasBytesAvailable:
				var data = Data()
				guard inputStream.read(data: &data) > 0 else { return }
				print("HalloDataStream: Recieved data - \(String(describing: String(data: data, encoding: .utf8)))")
				let decoder = JSONDecoder()
				if let request = try? decoder.decode(Request.self, from: data) {
					delegate?.didReceive(request: request)
				}
				if let response = try? decoder.decode(HalloResponse.self, from: data) {
					delegate?.didReceive(response: response)
				}
			default: break
			}
		}
	}
iOS App code
serviceBrowser.searchForServices(ofType: "_my-app._tcp.", inDomain: "local.")
func connect(with service: NetService, completion: @escaping DeviceConnectionCompletion) {
		deviceCompletion = completion
		let config = URLSessionConfiguration.default
		config.requestCachePolicy = .reloadIgnoringLocalCacheData
		let session = URLSession(configuration: config, delegate: self, delegateQueue: .main)
		streamTask = session.streamTask(with: service)
		streamTask?.resume()
		streamTask?.captureStreams()
	}
	func send(request: Request) {
		do {
			let data = try encoder.encode(request)
			print("HalloClient: Request: \(String(describing: String(data: data, encoding: .utf8)))")
			if dataStream?.outputSteam.write(data: data) == -1 {
				print("HalloClient: send(request: Request) Write failied")
			}
		} catch {
			print("HalloClient: Exception in send(request: Request)")
		}
	}
// URLSessionStreamDelegate
func urlSession(
		_ session: URLSession,
		streamTask: URLSessionStreamTask,
		didBecome inputStream: InputStream,
		outputStream: OutputStream
	) {
		print("didBecomeInputStream:(NSInputStream *)inputStream outputStream: OutputStream")
		deviceCompletion?(true)
		self.inputStream = inputStream
		self.outputSteam = outputSteam
		self.inputStream.delegate = self
		self.outputSteam.delegate = self
		self.inputStream.schedule(in: .main, forMode: .default)
		self.inputStream.schedule(in: .main, forMode: .default)
		self.inputStream.open()
		self.inputStream.open()
	}
// StreamDelegate
	 func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
		 // code exactly same as mac app delegate
	 }
Extensions on IO stream
extension InputStream {
	private var maxLength: Int { return 4096 }
	func read(data: inout Data) -> Int {
		var totalReadCount: Int = 0
		let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: maxLength)
		while hasBytesAvailable {
			let numberOfBytesRead = read(buffer, maxLength: maxLength)
			if numberOfBytesRead < 0, let error = streamError {
				print("Read Error: \(error)")
				break
			}
			data.append(buffer, count: numberOfBytesRead)
			totalReadCount += numberOfBytesRead
		}
		return totalReadCount
	}
}
extension OutputStream {
	@discardableResult
	func write(data: Data) -> Int {
		if streamStatus != .open {
			open()
		}
		let count = data.count
		let result = data.withUnsafeBytes {
			write($0.bindMemory(to: UInt8.self).baseAddress!, maxLength: count)
		}
		close()
		return result
	}
}
It would be really helpful if somebody can review my code and help me figure out the issue. I have a feeling that the issue is with stream open() and close(). Initially, nothing was working but adding open and close functions during write helped. Maybe I need a better way to fix this problem. PS: I had the same problem with CocoaAsyncSocket and I am not looking to use it or any other third party solution.
Since I've upgraded to Big Sur Xcode 10.3 which I need is crashed when I try to launch it. I reinstalled to no avail...
Process: Xcode [943]
Path: /Users/USER/Downloads/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 10.3 (14492.2)
Build Info: IDEFrameworks-14492002000000000~2 (10G8)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [943]
User ID: 501
PlugIn Path: /Users/USER/Downloads/Xcode.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
PlugIn Identifier: libMainThreadChecker.dylib
PlugIn Version: ??? (64492.1)
Date/Time: 2020-11-19 13:23:03.155 +0100
OS Version: macOS 11.0.1 (20B29)
Report Version: 12
Bridge OS Version: 5.0.1 (18P2561)
Anonymous UUID: 3A5EAA65-D39F-FA97-D7F6-A9504FA39AEC
Time Awake Since Boot: 1100 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXCBADACCESS (SIGBUS)
Exception Codes: KERNPROTECTIONFAILURE at 0x00007fff237a29b9
Exception Note: EXCCORPSENOTIFY
Termination Signal: Bus error: 10
Termination Reason: Namespace SIGNAL, Code 0xa
Terminating Process: exc handler [943]
VM Regions Near 0x7fff237a29b9:
_TEXT 7fff22c09000-7fff23600000 [ 10.0M] r-x/r-x SM=COW /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit-> TEXT 7fff23600000-7fff23800000 [ 2048K] r-x/rwx SM=PRV /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
Submap 7fff23800000-7fff40000000 [456.0M] r--/rwx SM=PRV process-only VM submap
Application Specific Information:
/Users/tmiskiew/Downloads/Xcode.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
ProductBuildVersion: 10G8
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libMainThreadChecker.dylib 0x000000011ad0c069 swizzleImplementationFast + 115
1 libMainThreadChecker.dylib 0x000000011ad0bef0 addSwizzler + 165
2 libMainThreadChecker.dylib 0x000000011ad0baec libraryinitializer + 2937
3 dyld 0x000000010e5bfdf5 ImageLoaderMachO::doImageInit(ImageLoader::LinkContext const&) + 321
4 dyld 0x000000010e5c046d ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 29
5 dyld 0x000000010e5bad1a ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 492
6 dyld 0x000000010e5b8b82 ImageLoader::processInitializers(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 188
7 dyld 0x000000010e5b8c22 ImageLoader::runInitializers(ImageLoader::LinkContext const&, ImageLoader::InitializerTimingList&) + 82
8 dyld 0x000000010e5a96a2 dyld::runInitializers(ImageLoader*) + 82
9 dyld 0x000000010e5b4569 dlopeninternal + 609
10 libdyld.dylib 0x00007fff20354fd0 dlopeninternal(char const*, int, void*) + 177
11 libdyld.dylib 0x00007fff2034387e dlopen + 28
12 com.apple.dt.IDEFoundation 0x0000000104617487 IDEInitializeMainThreadChecker + 400
13 com.apple.dt.IDEFoundation 0x0000000104617e99 IDEInitialize + 1038
14 com.apple.dt.IDEKit 0x000000010526e3cd -[IDEApplicationController applicationWillFinishLaunching:] + 622
...
External Modification Summary:
Calls made by other processes targeting this process:
taskforpid: 0
threadcreate: 0
threadsetstate: 0
Calls made by this process:
taskforpid: 0
threadcreate: 0
threadsetstate: 0
Calls made by all processes on this machine:
taskforpid: 543
threadcreate: 0
threadsetstate: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=1.0G resident=0K(0%) swappedoutorunallocated=1.0G(100%)
Writable regions: Total=872.0M written=0K(0%) resident=0K(0%) swappedout=0K(0%) unallocated=872.0M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 1
Dispatch continuations 128.0M 1
Foundation 16K 1
Kernel Alloc Once 8K 1
MALLOC 131.2M 32
MALLOC guard page 24K 4
MALLOCMEDIUM (reserved) 600.0M 5 reserved VM address space (unallocated)
STACK GUARD 56.0M 4
Stack 9752K 4
VMALLOCATE 916K 12
_CTF 759 1
DATA 35.0M 567
DATACONST 27.4M 340
_DATADIRTY 1829K 217
_FONTDATA 4K 1
_LINKEDIT 526.6M 77
OBJCRO 61.0M 1
_OBJCRW 2468K 2
_TEXT 530.4M 554
UNICODE 588K 1
mapped file 46.9M 10
shared memory 40K 4
=========== ======= =======
TOTAL 2.1G 1840
TOTAL, minus reserved VM space 1.5G 1840
Model: iMac20,2, BootROM 1554.50.3.0.0 (iBridge: 18.16.12561.0.0,0), 8 processors, 8-Core Intel Core i7, 3,8 GHz, 40 GB, SMC
Graphics: kHWAMDRadeonPro5700Item, AMD Radeon Pro 5700, spdisplayspciedevice, 8 GB
Memory Module: Slot 1 (Channel A / DIMM 1), 4 GB, DDR4, 2667 MHz, SK Hynix, HMA851S6DJR6N-VK
Memory Module: Slot 2 (Channel A / DIMM 0), 4 GB, DDR4, 2667 MHz, SK Hynix, HMA851S6DJR6N-VK
Memory Module: Slot 3 (Channel B / DIMM 1), 16 GB, DDR4, 2667 MHz, 0000, unknown
Memory Module: Slot 4 (Channel B / DIMM 0), 16 GB, DDR4, 2667 MHz, 0000, unknown
AirPort: spairportwirelesscardtypeairport_extreme (0x14E4, 0x7BF), wl0: Sep 11 2020 17:01:15 version 9.30.440.2.32.5.61 FWID 01-1d69e4b4
Bluetooth: Version 8.0.1f5, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
USB Device: USB 3.1 Bus
USB Device: Apple T2 Bus
USB Device: Headset
USB Device: Ambient Light Sensor
USB Device: FaceTime HD Camera (Built-in)
USB Device: Apple T2 Controller
Thunderbolt Bus: iMac, Apple Inc., 58.2
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