/// <summary>
/// 新たな更新情報が確認された後の手続きを確認します。
/// </summary>
private NextUpdateAction OnUpdateDetected(AppCastItem latestVersion)
{
var e = new UpdateDetectedEventArgs
{
NextAction = NextUpdateAction.ContinueToUpdate,
ApplicationConfig = config,
LatestVersion = latestVersion,
};
UpdateDetected.SafeRaiseEvent(this, e);
return(e.NextAction);
}
/// <summary>
/// 更新情報のダウンロード後に呼ばれます。
/// </summary>
void web_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
{
if (e.Cancelled || e.Error != null)
{
Log.ErrorException(e.Error,
"更新情報の取得に失敗しました。");
this.latestVersionEvent.Set();
return;
}
try
{
var text = Encoding.UTF8.GetString(e.Result);
var latestVersion = AppCastItemUtil.GetLatestVersion(text);
if (!IsUpdateRequired(latestVersion))
{
this.latestVersionEvent.Set();
return;
}
this.latestVersion = latestVersion;
this.latestVersionEvent.Set();
// show the update window
Log.Info(
"Update needed from version {0} to version {1}.",
this.config.InstalledVersion,
latestVersion.Version);
switch (OnUpdateDetected(latestVersion))
{
case NextUpdateAction.ContinueToUpdate:
Log.Info("Updater: Continue to update");
BeginDownload(latestVersion);
break;
case NextUpdateAction.ProhibitUpdate:
default:
Log.Info("Updater: Update prohibited");
break;
}
}
catch (Exception ex)
{
Log.ErrorException(ex,
"ダウンロードに失敗しました。");
}
}
/// <summary>
/// 必要なファイルのダウンロードを開始します。
/// </summary>
private void BeginDownload(AppCastItem latestVersion)
{
this.downloader = new Downloader();
this.downloadFilePath = Util.GetTempFileName();
this.packFilePath = Util.GetTempFileName();
this.packConfigFilePath = this.packFilePath + ".config";
this.downloader.BeginDownload(
new Uri(latestVersion.DownloadLink),
(_, e) => SaveDownloadFile(this.downloadFilePath, e));
this.downloader.BeginDownload(
new Uri(latestVersion.UpdatePackLink),
(_, e) => SaveDownloadFile(this.packFilePath, e));
this.downloader.BeginDownload(
new Uri(latestVersion.UpdatePackLink + ".config"),
(_, e) => SaveDownloadFile(this.packConfigFilePath, e));
}
/// <summary>
/// This method checks if an update is required. During this process the appcast
/// will be downloaded and checked against the reference assembly. Ensure that
/// the calling process has access to the internet and read access to the
/// reference assembly. This method is also called from the background loops.
/// </summary>
private bool IsUpdateRequired(AppCastItem latestVersion)
{
if (latestVersion == null)
{
Log.Info(
"Updater: No version information in app cast found.");
return(false);
}
else
{
Log.Info(
"Updater: Lastest version on the server is {0}.",
latestVersion.Version);
}
// check if the available update has to be skipped
if (latestVersion.Version.Equals(this.config.SkipThisVersion))
{
Log.Info(
"Updater: Latest update has to be skipped (user decided to skip version {0})",
config.SkipThisVersion);
return(false);
}
// check if the version will be the same then the installed version
var v1 = new Version(this.config.InstalledVersion);
var v2 = new Version(latestVersion.Version);
if (v2 <= v1)
{
Log.Info(
"Updater: Installed version is valid, no update needed. ({0})",
this.config.InstalledVersion);
return(false);
}
// ok we need an update
return(true);
}
/// <summary>
/// アプリの最新バージョン情報を取得します。
/// </summary>
/// <remarks>
/// このメソッドは例外を投げる可能性があります。
/// </remarks>
public static AppCastItem GetLatestVersion(string text)
{
if (string.IsNullOrEmpty(text))
{
return(null);
}
/*using (var textReader = new StringReader(text))
* using (var reader = XmlReader.Create(textReader))*/
{
var doc = new XmlDocument
{
PreserveWhitespace = false,
};
doc.LoadXml(text);
var itemNodes = doc.SelectNodes(TopItemNode);
AppCastItem latestVersion = null;
// rss中の全itemタグを検索します。
foreach (var itemNode in itemNodes.OfType <XmlNode>())
{
var currentItem = CreateAppCastItemFromNode(doc, itemNode);
if (latestVersion == null)
{
latestVersion = currentItem;
}
else if (currentItem.CompareTo(latestVersion) > 0)
{
latestVersion = currentItem;
}
}
// go ahead
return(latestVersion);
}
}
