public async Task <UpdateInfo> CheckForUpdate(
string localReleaseFile,
string updateUrlOrPath,
bool ignoreDeltaUpdates = false,
Action <int> progress = null,
IFileDownloader urlDownloader = null,
bool startOverIfNone = false)
{
progress = progress ?? (_ => { });
var localReleases = Enumerable.Empty <ReleaseEntry>();
bool shouldInitialize = false;
try {
localReleases = Utility.LoadLocalReleases(localReleaseFile);
} catch (Exception ex) {
// Something has gone pear-shaped, let's start from scratch
this.Log().WarnException("Failed to load local releases, starting from scratch", ex);
shouldInitialize = true;
}
restart:
if (shouldInitialize)
{
await initializeClientAppDirectory();
}
string releaseFile;
var latestLocalRelease = localReleases.Count() > 0 ?
localReleases.MaxBy(x => x.Version).First() :
default(ReleaseEntry);
// Fetch the remote RELEASES file, whether it's a local dir or an
// HTTP URL
if (Utility.IsHttpUrl(updateUrlOrPath))
{
if (updateUrlOrPath.EndsWith("/"))
{
updateUrlOrPath = updateUrlOrPath.Substring(0, updateUrlOrPath.Length - 1);
}
this.Log().Info("Downloading RELEASES file from {0}", updateUrlOrPath);
int retries = 3;
retry:
try {
var uri = Utility.AppendPathToUri(new Uri(updateUrlOrPath), "RELEASES");
if (latestLocalRelease != null)
{
uri = Utility.AddQueryParamsToUri(uri, new Dictionary <string, string> {
{ "id", latestLocalRelease.PackageName },
{ "localVersion", latestLocalRelease.Version.ToString() },
{ "arch", Environment.Is64BitOperatingSystem ? "amd64" : "x86" }
});
}
var data = await urlDownloader.DownloadUrl(uri.ToString());
releaseFile = Encoding.UTF8.GetString(data);
} catch (WebException ex) {
this.Log().InfoException("Download resulted in WebException (returning blank release list)", ex);
if (retries <= 0)
{
throw;
}
retries--;
goto retry;
}
progress(33);
}
else
{
this.Log().Info("Reading RELEASES file from {0}", updateUrlOrPath);
if (!Directory.Exists(updateUrlOrPath))
{
var message = String.Format(
"The directory {0} does not exist, something is probably broken with your application",
updateUrlOrPath);
throw new Exception(message);
}
var fi = new FileInfo(Path.Combine(updateUrlOrPath, "RELEASES"));
if (!fi.Exists)
{
var message = String.Format(
"The file {0} does not exist, something is probably broken with your application",
fi.FullName);
this.Log().Warn(message);
var packages = (new DirectoryInfo(updateUrlOrPath)).GetFiles("*.nupkg");
if (packages.Length == 0)
{
throw new Exception(message);
}
// NB: Create a new RELEASES file since we've got a directory of packages
ReleaseEntry.WriteReleaseFile(
packages.Select(x => ReleaseEntry.GenerateFromFile(x.FullName)), fi.FullName);
}
releaseFile = File.ReadAllText(fi.FullName, Encoding.UTF8);
progress(33);
}
var ret = default(UpdateInfo);
var remoteReleases = ReleaseEntry.ParseReleaseFile(releaseFile);
progress(66);
if (!remoteReleases.Any())
{
throw new Exception("Remote release File is empty or corrupted");
}
ret = determineUpdateInfo(localReleases, remoteReleases, ignoreDeltaUpdates);
progress(100);
if (startOverIfNone && !ret.ReleasesToApply.Any())
{
// User has apparently re-run the installer for the version already installed.
// Assume the intent is to repair a broken installation.
// These rather awkward steps cause it to erase the installed-version directory
// and re-create it, much like a first-time install (though it won't run the app
// with the special arguments for first-time).
shouldInitialize = true;
localReleases = Enumerable.Empty <ReleaseEntry>();
goto restart;
}
return(ret);
}