public void Start(string[] wantedCaches)
{
_thread = new Thread(delegate()
{
#if !DEBUG
try
{
#endif
SendStatus(StatusChangedEnum.Start);
//SendStatus(StatusChangedEnum.CacheDownloading, "caches.xml", 0);
Log.Info(String.Format("Starting Update process. Wanted caches: {0}",
String.Join(", ", wantedCaches)));
//Step 1. Get the remote file.
var file = _wc.DownloadString(_server + "caches.xml");
var xml = XDocument.Parse(file);
_remoteCache = new Caches(xml);
Log.Info("Remote caches have been downloaded.");
var versions = _remoteCache.Versions();
foreach (var a in versions)
{
Log.Info(String.Format("Cache: {0} Version: {1}", a.Key, a.Value));
}
SendStatus(StatusChangedEnum.CacheDownloaded, new object[] {"caches.xml", versions}, 0);
//populate this with all possible caches
var cachesToUpdate = new List<string>(wantedCaches);
//step 2. Get the local file, and compare
if (_localCacheLocation != "" && File.Exists(_localCacheLocation))
{
file = File.ReadAllText(_localCacheLocation);
xml = XDocument.Parse(file);
_localCache = new Caches(xml);
Log.Info("Local caches:");
foreach (var a in _localCache.Versions())
{
Log.Info(String.Format("Cache: {0} Version: {1}", a.Key, a.Value));
}
//step 2a. Compare version numbers.
var localVersions = _localCache.Versions();
foreach (var wantedCache in wantedCaches)
{
if (versions.ContainsKey(wantedCache))
{
if (localVersions.ContainsKey(wantedCache) &&
versions[wantedCache] <= localVersions[wantedCache])
{
//update is not needed for this cache.
cachesToUpdate.Remove(wantedCache);
}
}
else
{
cachesToUpdate.Remove(wantedCache);
}
}
}
else
{
Log.Info("Local caches are not found or unused. Downloading all wanted caches.");
SendStatus(StatusChangedEnum.LocalCachesNotFound);
}
//cachesToUpdate now contains a list of all caches to get.
if (cachesToUpdate.Count == 0)
{
//success - no update needed
tasksDone = 0;
tasksTotal = 1;
Log.Info("no update needed");
SendStatus(StatusChangedEnum.NoUpdateNeeded);
SendStatus(StatusChangedEnum.Finish);
return;
}
tasksDone = 0;
tasksTotal = cachesToUpdate.Count;
Log.Info(String.Format("Caches to download: {0}", String.Join(", ", cachesToUpdate.ToArray())));
//step 3. Get the CacheInfo for each wanted cache.
var cacheContentFileList = new List<CacheContentFile>();
foreach (var cache in cachesToUpdate)
{
SendStatus(StatusChangedEnum.CacheDownloading, cache, 1);
file = _wc.DownloadString(_server + cache + "/info.xml");
xml = XDocument.Parse(file);
var ci = new CacheInfo(this, Location, cache, xml);
var files = ci.Files();
cacheContentFileList.AddRange(files);
SendStatus(StatusChangedEnum.CacheDownloaded, new object[] {cache, files}, 0);
}
tasksDone = 0;
tasksTotal = cacheContentFileList.Sum(cifile => cifile.CompressedSize);
if (tasksTotal != 0)
{
SendStatus(StatusChangedEnum.DownloadsStart);
foreach (var cifile in cacheContentFileList)
{
//step 4. Download and decompress.
Log.Info(String.Format("Downloading {0}", cifile.Cache + "/" + cifile.Name));
int retries = 0;
int maxRetries = 3;
int rampUpTime = 2;
bool success = false;
while (!success && retries <= maxRetries)
{
//totalProgress = cifile.CompressedSize;
SendStatus(StatusChangedEnum.FileStart, cifile.Cache + "/" + cifile.Name, 0);
success = Download(cifile);
if (!success)
{
SendStatus(StatusChangedEnum.FileFailed, cifile.Cache + "/" + cifile.Name,
-cifile.CompressedSize);
//backtrack the progress
retries++;
if (retries <= maxRetries)
{
int waitTime = (int) (Math.Pow(rampUpTime, retries))*1000;
SendStatus(StatusChangedEnum.FileRedownload,
new object[] {cifile.Cache + "/" + cifile.Name, waitTime}, 0);
Log.Warn(string.Format("Redownloading {0} (sleeping {1} ms)", cifile.Name,
waitTime));
Thread.Sleep(waitTime);
}
}
}
if (!success)
{
SendStatus(StatusChangedEnum.Fail, _lastException, 0);
return;
}
SendStatus(StatusChangedEnum.FileFinish, cifile.Cache + "/" + cifile.Name, 0);
}
SendStatus(StatusChangedEnum.DownloadsFinish);
}
//step 5. Save remote cache as local cache.
if(_localCacheLocation != "")
{
file = _remoteCache.ToString();
var path = Path.Combine(Location, _localCacheLocation);
File.WriteAllText(path, file);
SendStatus(StatusChangedEnum.LocalCacheSaved);
}
SendStatus(StatusChangedEnum.Finish);
#if !DEBUG
}
catch (Exception e){
SendStatus(StatusChangedEnum.Fail, e, 0);
}
#endif
});
_thread.Start();
}
