Created
June 13, 2013 15:07
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Http client Downloader for Retry(Palmer lib)/Resume download requests enabled.
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using System; | |
using System.Collections.Generic; | |
using System.ComponentModel; | |
using System.IO; | |
using System.Linq; | |
using System.Net; | |
using System.Net.Security; | |
using System.Reflection; | |
using System.Security.Cryptography.X509Certificates; | |
using System.Text; | |
using System.Threading; | |
using System.Threading.Tasks; | |
using Palmer; | |
namespace ConsoleApplication1 | |
{ | |
internal class Program | |
{ | |
public static void Main(string[] args) | |
{ | |
Console.WriteLine("Starting download.... "); | |
try | |
{ | |
DownloadFile("https://github.com/MitchDenny/Palmer/archive/master.zip", "C:\\Temp\\packages.zip"); | |
} | |
catch (Exception ex) | |
{ | |
if (!string.Equals(ex.Message, "Stack Empty.", StringComparison.InvariantCultureIgnoreCase)) | |
{ | |
Console.WriteLine("========= Error =========="); | |
Console.WriteLine("{0}{1}{1} Inner Exception: {1} {2}", ex.Message, Environment.NewLine, | |
ex.InnerException.ToString()); | |
} | |
} | |
Console.WriteLine("Press enter key to exit.. "); | |
Console.Read(); | |
} | |
public static bool DownloadFile(string url, string filepath) | |
{ | |
WebClient client = new WebClient(); | |
ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, errors) => | |
{ return true; }; | |
// Add a user agent header in case the | |
// requested URI contains a query. | |
int count = 1; | |
bool result = true; | |
Retry.On<Exception>().For(3).With(context => | |
{ | |
try | |
{ | |
client.Headers.Add("user-agent", | |
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)"); | |
client.OpenRead(url); | |
FileInfo finfo = null; | |
if (File.Exists(filepath)) | |
{ | |
finfo = new FileInfo(filepath); | |
if (client.ResponseHeaders != null && | |
finfo.Length >= Convert.ToInt64(client.ResponseHeaders["Content-Length"])) | |
{ | |
File.Delete(filepath); | |
} | |
} | |
DownloadFileWithResume(url, filepath); | |
// Refresh the file content size | |
finfo = finfo ?? new FileInfo(destinationFilePath); | |
if (finfo.Length == Convert.ToInt64(client.ResponseHeaders["Content-Length"])) | |
{ | |
result = true; | |
Console.WriteLine("Download success!!!"); | |
} | |
else | |
{ | |
result = false; | |
throw new WebException("Download interrupted. Retrying download.. "); | |
} | |
} | |
catch (Exception ex) | |
{ | |
Console.WriteLine("Error: {0} {1}", ex.Message, Environment.NewLine); | |
Console.WriteLine("Download inturrpted retry({0}).. in 5 seconds", count++); | |
System.Threading.Thread.Sleep(5000); | |
throw; | |
} | |
}); | |
return false; | |
} | |
private static void DownloadFileWithResume(string sourceUrl, string destinationPath) | |
{ | |
long existLen = 0; | |
System.IO.FileStream saveFileStream; | |
if (System.IO.File.Exists(destinationPath)) | |
{ | |
System.IO.FileInfo fINfo = | |
new System.IO.FileInfo(destinationPath); | |
existLen = fINfo.Length; | |
} | |
if (existLen > 0) | |
saveFileStream = new System.IO.FileStream(destinationPath, | |
System.IO.FileMode.Append, System.IO.FileAccess.Write, | |
System.IO.FileShare.ReadWrite); | |
else | |
saveFileStream = new System.IO.FileStream(destinationPath, | |
System.IO.FileMode.Create, System.IO.FileAccess.Write, | |
System.IO.FileShare.ReadWrite); | |
System.Net.HttpWebRequest httpWebRequest; | |
System.Net.HttpWebResponse httpWebResponse; | |
httpWebRequest = (System.Net.HttpWebRequest) System.Net.HttpWebRequest.Create(sourceUrl); | |
httpWebRequest.AddRange((int) existLen); | |
System.IO.Stream smRespStream; | |
httpWebResponse = (System.Net.HttpWebResponse) httpWebRequest.GetResponse(); | |
smRespStream = httpWebResponse.GetResponseStream(); | |
var abc = httpWebRequest.Timeout; | |
smRespStream.CopyTo(saveFileStream); | |
saveFileStream.Close(); | |
} | |
} | |
} |
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