private CacheMetaData CacheFile(HttpWebResponse resp, string fileName)
{
var etag = resp.Headers[HttpResponseHeader.ETag];
string md5;
if (etag != null)
{
md5 = etag.Split(':')[0].Substring(1);
}
else
{
md5 = "0";
}
CacheMetaData meta = new CacheMetaData(resp.ContentLength, md5);
_metaData[fileName] = meta;
using (var sw = File.AppendText(Path.Combine(CachePath, "cache.meta")))
{
sw.WriteLine(string.Format("{0} {1} {2}", fileName, resp.ContentLength, md5.ToUpper()));
}
return(meta);
}
public void DownloadFile(string url, string path)
{
Directory.CreateDirectory(Path.GetDirectoryName(path));
//using (var client = new HttpClient())
//{
// var msg = client.GetAsync(url).Result;
// using (Stream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
// {
// //CacheMetaData.AddToCache(resp, path);
// //CopyToStream(stream, fs, resp.ContentLength);
// msg.Content.CopyToAsync(fs).Wait();
// }
//}
HttpWebRequest request = WebRequest.CreateHttp(url);
using (HttpWebResponse resp = (HttpWebResponse)request.GetResponseAsync().Result)
using (Stream stream = resp.GetResponseStream())
using (Stream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
CacheMetaData.AddToCache(resp, path);
CopyToStream(stream, fs, resp.ContentLength);
}
}
public static CacheMetaData AddToCache(HttpWebResponse resp, string file)
{
string md5 = resp.Headers[HttpResponseHeader.ETag].Split(':')[0].Substring(1);
CacheMetaData meta = new CacheMetaData(resp.ContentLength, md5.ToByteArray());
meta.Save(file);
return(meta);
}
public MemoryStream OpenFile(string name, string url, bool isData)
{
if (!Enabled)
{
return(null);
}
if (isData && !CacheData)
{
return(null);
}
string file = Path.Combine(_cachePath, name);
FileInfo fi = new FileInfo(file);
if (!fi.Exists)
{
_downloader.DownloadFile(url, file);
}
if (Validate)
{
CacheMetaData meta = CacheMetaData.Load(file) ?? _downloader.GetMetaData(url, file);
if (meta == null)
{
throw new Exception(string.Format("unable to validate file {0}", file));
}
bool sizeOk, md5Ok;
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
sizeOk = fs.Length == meta.Size;
md5Ok = _md5.ComputeHash(fs).EqualsTo(meta.MD5);
}
if (!sizeOk || !md5Ok)
{
_downloader.DownloadFile(url, file);
}
}
MemoryStream ms = new MemoryStream();
using (FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
fileStream.CopyTo(ms);
return(ms);
}
public CacheMetaData GetMetaData(string url, string file)
{
try
{
HttpWebRequest request = WebRequest.CreateHttp(url);
request.Method = "HEAD";
using (HttpWebResponse resp = (HttpWebResponse)request.GetResponseAsync().Result)
{
return(CacheMetaData.AddToCache(resp, file));
}
}
catch
{
return(null);
}
}
private CDNCache(CASCConfig config)
{
if (Enabled)
{
_config = config;
string metaFile = Path.Combine(CachePath, "cache.meta");
_metaData = new Dictionary <string, CacheMetaData>(StringComparer.OrdinalIgnoreCase);
if (File.Exists(metaFile))
{
var lines = File.ReadLines(metaFile);
foreach (var line in lines)
{
string[] tokens = line.Split(' ');
_metaData[tokens[0]] = new CacheMetaData(Convert.ToInt64(tokens[1]), tokens[2]);
}
}
}
}
