HTTP Request - Making Request #network #http

httpRequest.swift

 // Apply Delegate to the UIViewController
protocol CoinManagerDelegate {
    func didUpdateData(_ sender: CoinManager, parsedData: BitcoinData)
    func didFailWithError(_ sender: CoinManager, error: Error)
}

// Insert these calls into the component making the call (Manager class)

	func performRequest(with urlString: String) {
        let url = URL(string: urlString)
        guard let requestUrl = url else { fatalError() }
        var request = URLRequest(url: requestUrl)
        
        request.httpMethod = "GET"
        
//        // Set HTTP Request Header
//        request.setValue("application/json", forHTTPHeaderField: "Accept")
        
        let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
            
            // Check if Error took place
            if let error = error {
                self.delegate?.didFailWithError(self, error: error)
                return
            }
            
            if let safeData = data {
                if let parsedData = self.parseJSON(safeData) {
                    self.delegate?.didUpdateData(self, parsedData: parsedData)
                }
            }
            
//            // Read HTTP Response Status code
//            if let response = response as? HTTPURLResponse {
//                print("Response HTTP Status code: \(response.statusCode)")
//            }
//
//            // Convert HTTP Response Data to a simple String
//            if let data = data, let dataString = String(data: data, encoding: .utf8) {
//                print("Response data string:\n \(dataString)")
//            }
            
        }
        task.resume()
    }
    
    func parseJSON(_ requestData: Data)-> BitcoinData? {
        let decoder = JSONDecoder()
        do {
            let decodedData = try decoder.decode(BitcoinData.self, from: requestData)
            // Alternatively map decodedData to a more succient model
            return decodedData
        } catch {
            self.delegate?.didFailWithError(self, error: error)
            return nil
        }
    }