taler-ios

QuickDataTask.swift (10741B)

---

 /*
  * This file is part of GNU Taler, ©2022-26 Taler Systems S.A.
  * See LICENSE.md
  */
 /**
  * @author Marc Stibane
  * @author codex gpt5.6-sol
  */
 import Foundation
 //import "Foundation/NSURLError.h"
 import os.log
 
 import FTalerWalletcore
 
 // will be called from wallet-core for networking
 func request_create(userdata: Optional<UnsafeMutableRawPointer>,
                  requestInfo: Optional<UnsafeMutablePointer<JSHttpRequestInfo>>) -> Int32 {
     let quickjs = Unmanaged<Quickjs>.fromOpaque(userdata!).takeUnretainedValue()
 
     if let requestInfo {
         if let url = URL(string: String(cString: requestInfo.pointee.url)) {
             let responseCb = requestInfo.pointee.response_cb
             let responseCbCls = requestInfo.pointee.response_cb_cls
             let method = String(cString: requestInfo.pointee.method)
             let requestHeaders = requestInfo.pointee.request_headers
                 let redirect = requestInfo.pointee.redirect             // TODO: redirect
             let timeoutMs = requestInfo.pointee.timeout_ms
                 let debug = requestInfo.pointee.debug                   // TODO: debug
             let reqBody = requestInfo.pointee.req_body
             let bodyLen = requestInfo.pointee.req_body_len
 
             var request = URLRequest(url: url)
             request.httpMethod = method
             switch timeoutMs {
                 case 0:         // leave URLSession's default
                     break
                 case ..<0:      // "no timeout"
                     request.timeoutInterval = 60 * 60 * 24
                 default:
                     request.timeoutInterval = TimeInterval(timeoutMs) / 1000.0
             }
             if let reqBody, bodyLen > 0 {   // qtart frees req_body as soon as request_create returns,
                 request.httpBody = Data(bytes: reqBody, count: Int(bodyLen))    // thus we must copy it
             }
             if var ptr = requestHeaders {
                 while let cString = ptr.pointee {
                     let string = String(cString: cString)
                     if let index = string.firstIndex(of: ":") {
                         let headerField = string.prefix(upTo: index)
                         let nextIndex = string.index(index, offsetBy: 1)        // skip the ":"
                         let value = string.suffix(from: nextIndex)
                         request.addValue(String(value), forHTTPHeaderField: String(headerField))
                     }
                     ptr += 1
                 }
             }
             return quickjs.reqCreate(request, responseCb, responseCbCls)
         }
     }
     let logger = Logger(subsystem: "net.taler.gnu", category: "Networking Failure")
     logger.error("Failed to create URLRequest for >>\(String(describing: requestInfo?.pointee.url))<<")
     return -1
 }
 
 func request_cancel(userdata: Optional<UnsafeMutableRawPointer>,
                    requestID: Int32) -> Int32 {
     let quickjs = Unmanaged<Quickjs>.fromOpaque(userdata!).takeUnretainedValue()
     return quickjs.reqCancel(requestID)
 }
 // MARK: -
 extension Error {
     var errorCode:Int? {
         return (self as NSError).code
     }
 }
 // MARK: -
 final class QuickDataTask: NSObject, @unchecked Sendable {
     let urlSession: URLSession
     let request: URLRequest
     let requestID: Int32
     let responseCb: JSHttpResponseCb?
     let responseCbCls: Optional<UnsafeMutableRawPointer>
 
     private let state = NSCondition()
     private let onFinish: (Int32) -> Void
     private var dataTask: URLSessionDataTask?
     private var isCancelled = false
     private var isCallbackActive = false
     private var isFinished = false
 #if DEBUG || TALER_NIGHTLY
     private let logger: Logger
 #endif
 
     init(urlSession: URLSession,
             request: URLRequest,
           requestID: Int32,
          responseCb: JSHttpResponseCb?,
       responseCbCls: Optional<UnsafeMutableRawPointer>,
            onFinish: @escaping (Int32) -> Void
     ) {
 #if DEBUG || TALER_NIGHTLY
         self.logger = Logger(subsystem: "net.taler.gnu", category: "Networking")
 #endif
         self.urlSession = urlSession
         self.request = request
         self.requestID = requestID
         self.responseCb = responseCb
         self.responseCbCls = responseCbCls
         self.onFinish = onFinish
     }
 
     func run() {
         guard responseCb != nil, responseCbCls != nil else {
             finish()
             return
         }
 
         let method = request.httpMethod ?? "Unknown"
         let url = request.url?.trimmedString ?? EMPTYSTRING
 #if DEBUG || TALER_NIGHTLY
         logger.trace("❓\(self.requestID, privacy: .public)  \(method, privacy: .public) \(url, privacy: .public)")
 #endif
         let task = urlSession.dataTask(with: request) { [self] data, response, error in
             handleCompletion(data: data,
                          response: response,
                             error: error,
                            method: method,
                               url: url)
         }
 
         state.lock()
         guard !isFinished else {
             state.unlock()
             task.cancel()
             return
         }
         dataTask = task
         let shouldStart = !isCancelled
         state.unlock()
 
         if shouldStart {
             task.resume()
         } else {
             task.cancel()
             finish()
         }
     }
 
     /// Cancels the request and does not return until a native callback that had
     /// already started has completed. A URLSession completion may still arrive
     /// later, but `isCancelled` prevents it from entering the native callback.
     func cancel() {
         state.lock()
         guard !isFinished else {
             state.unlock()
             return
         }
         isCancelled = true
         let task = dataTask
         state.unlock()
 
         task?.cancel()
 
         var shouldNotify = false
         state.lock()
         while isCallbackActive {
             state.wait()
         }
         if !isFinished {
             isFinished = true
             dataTask = nil
             shouldNotify = true
         }
         state.unlock()
 
         if shouldNotify {
             onFinish(requestID)
         }
     }
 
     private func handleCompletion(data: Data?,
                               response: URLResponse?,
                                  error: Error?,
                                 method: String,
                                    url: String) {
         guard beginCallback() else {
             finish()
             return
         }
         defer { endCallback() }
 
         if let response = response as? HTTPURLResponse {
             deliver(response: response, data: data ?? Data(), method: method, url: url)
         } else {
 #if DEBUG || TALER_NIGHTLY
             logger.error("⁉️ \(self.requestID, privacy: .public)  \(method, privacy: .public)  \(error, privacy: .public)")
 #endif
             Task.detached {
                 Controller.shared.checkInternetConnection()
             }
             deliver(error: error)
         }
     }
 
     private func deliver(response: HTTPURLResponse,
                              data: Data,
                            method: String,
                               url: String) {
         guard let responseCb, let responseCbCls else {
             return
         }
 
         let status = Int32(response.statusCode)
         let errmsg = HTTPURLResponse.localizedString(forStatusCode: response.statusCode)
         let headerArray = response.allHeaderFields.map { "\($0.key): \($0.value)" }
         let cHeaders = CStringArray(headerArray)
 
 #if DEBUG || TALER_NIGHTLY
         if data.isEmpty {
             logger.error("‼️\(self.requestID, privacy: .public)  \(method, privacy: .public) \(response.statusCode, privacy: .public) \(errmsg, privacy: .public)")
         } else {
             logger.trace("❗️ \(self.requestID, privacy: .public) \(url, privacy: .public)")
         }
 #endif
 
         errmsg.withCString { errmsgPtr in
             data.withUnsafeBytes { bodyBytes in
                 var responseInfo = JSHttpResponseInfo(
                        request_id: requestID,
                            status: status,
                            errmsg: UnsafeMutablePointer(mutating: errmsgPtr),
                  response_headers: cHeaders.pointer,
              num_response_headers: Int32(headerArray.count),
                              body: UnsafeMutableRawPointer(mutating: bodyBytes.baseAddress),
                          body_len: numericCast(data.count)
                 )
                 withUnsafeMutablePointer(to: &responseInfo) { responseInfoPtr in
                     // cHeaders owns the C strings that response_headers points to, and ARC
                     // only keeps it alive up to its last use - which is reading .pointer
                     // above, before the callback that dereferences it has run
                     withExtendedLifetime(cHeaders) {
                         responseCb(responseCbCls, responseInfoPtr)
                     }
                 }
             }
         }
     }
 
     private func deliver(error: Error?) {
         guard let responseCb, let responseCbCls else {
             return
         }
 
         let errmsg = error?.localizedDescription ?? "Network request failed"
         errmsg.withCString { errmsgPtr in
             var responseInfo = JSHttpResponseInfo(
                    request_id: requestID,
                        status: 0,
                        errmsg: UnsafeMutablePointer(mutating: errmsgPtr),
              response_headers: nil,
          num_response_headers: 0,
                          body: nil,
                      body_len: 0
             )
             withUnsafeMutablePointer(to: &responseInfo) { responseInfoPtr in
                 responseCb(responseCbCls, responseInfoPtr)
             }
         }
     }
 
     private func beginCallback() -> Bool {
         state.lock()
         defer { state.unlock() }
         guard !isCancelled, !isFinished else {
             return false
         }
         isCallbackActive = true
         return true
     }
 
     private func endCallback() {
         var shouldNotify = false
         state.lock()
         isCallbackActive = false
         if !isFinished {
             isFinished = true
             dataTask = nil
             shouldNotify = true
         }
         state.broadcast()
         state.unlock()
 
         if shouldNotify {
             onFinish(requestID)
         }
     }
 
     private func finish() {
         var shouldNotify = false
         state.lock()
         if !isFinished {
             isFinished = true
             dataTask = nil
             shouldNotify = true
         }
         state.broadcast()
         state.unlock()
 
         if shouldNotify {
             onFinish(requestID)
         }
     }
 }