Exception handling for file download flow

Author: gnongsie

Client/ApiClient.cs

@@ -342,19 +342,26 @@ public Object CallApi(
                 HttpWebResponse responseT = (HttpWebResponse)requestT.GetResponse();
                 using (Stream responseStream = responseT.GetResponseStream())
                 {
-                    //setting high timeout to accomodate large files till 2GB, need to revisit for a dynamic approach
-                    responseStream.ReadTimeout = 8000000;
-                    responseStream.WriteTimeout = 9000000;
-                    using (Stream fileStream = File.OpenWrite(@DownloadReponseFileName))
+                    try
                     {
-                        byte[] buffer = new byte[4096];
-                        int bytesRead = responseStream.Read(buffer, 0, 4096);
-                        while (bytesRead > 0)
+                        //setting high timeout to accomodate large files till 2GB, need to revisit for a dynamic approach
+                        responseStream.ReadTimeout = 8000000;
+                        responseStream.WriteTimeout = 9000000;
+                        using (Stream fileStream = File.OpenWrite(@DownloadReponseFileName))
                         {
-                            fileStream.Write(buffer, 0, bytesRead);
-                            bytesRead = responseStream.Read(buffer, 0, 4096);
+                            byte[] buffer = new byte[4096];
+                            int bytesRead = responseStream.Read(buffer, 0, 4096);
+                            while (bytesRead > 0)
+                            {
+                                fileStream.Write(buffer, 0, bytesRead);
+                                bytesRead = responseStream.Read(buffer, 0, 4096);
+                            }
                         }
                     }
+                    catch (Exception)
+                    {
+                        throw new ApiException(-1, $"Error writing to path : {DownloadReponseFileName}");
+                    }
                 }
 
                 //setting the generic response with response headers

generator/cybersource-csharp-template/ApiClient.mustache

@@ -389,19 +389,26 @@ namespace {{packageName}}.Client
                 HttpWebResponse responseT = (HttpWebResponse)requestT.GetResponse();
                 using (Stream responseStream = responseT.GetResponseStream())
                 {
-                    //setting high timeout to accomodate large files till 2GB, need to revisit for a dynamic approach
-                    responseStream.ReadTimeout = 8000000;
-                    responseStream.WriteTimeout = 9000000;
-                    using (Stream fileStream = File.OpenWrite(@DownloadReponseFileName))
+                    try
                     {
-                        byte[] buffer = new byte[4096];
-                        int bytesRead = responseStream.Read(buffer, 0, 4096);
-                        while (bytesRead > 0)
+                        //setting high timeout to accomodate large files till 2GB, need to revisit for a dynamic approach
+                        responseStream.ReadTimeout = 8000000;
+                        responseStream.WriteTimeout = 9000000;
+                        using (Stream fileStream = File.OpenWrite(@DownloadReponseFileName))
                         {
-                            fileStream.Write(buffer, 0, bytesRead);
-                            bytesRead = responseStream.Read(buffer, 0, 4096);
+                            byte[] buffer = new byte[4096];
+                            int bytesRead = responseStream.Read(buffer, 0, 4096);
+                            while (bytesRead > 0)
+                            {
+                                fileStream.Write(buffer, 0, bytesRead);
+                                bytesRead = responseStream.Read(buffer, 0, 4096);
+                            }
                         }
                     }
+                    catch (Exception)
+                    {
+                        throw new ApiException(-1, $"Error writing to path : {DownloadReponseFileName}");
+                    }
                 }
 
                 //setting the generic response with response headers
@@ -825,11 +832,11 @@ namespace {{packageName}}.Client
                     int proxyPortTest;
 
                     if (!string.IsNullOrWhiteSpace(merchantConfig.ProxyAddress) && int.TryParse(merchantConfig.ProxyPort, out proxyPortTest)) 
-					{
+                    {
                         WebProxy proxy = new WebProxy(merchantConfig.ProxyAddress, proxyPortTest);
                         
                         if (!string.IsNullOrWhiteSpace(merchantConfig.ProxyUsername) && !string.IsNullOrWhiteSpace(merchantConfig.ProxyPassword)) 
-						{
+                        {
                             proxy.Credentials = new NetworkCredential(merchantConfig.ProxyUsername, merchantConfig.ProxyPassword);
                         }