private static string compareConnectionStrings(ref XmlDocument doc, DTO.RolloutInfo rollout)
{
var connNode = doc.SelectSingleNode("//ConnectionInfo");
string connString = "";
if (connNode != null && !string.IsNullOrEmpty(rollout.Connection.ConnectionString) && rollout.Connection.DateSet != null)
{
try
{
string currentString = connNode.Attributes.GetNamedItem("ConnectionString").Value;
DateTime currentStringDate = DateTime.Parse(connNode.Attributes.GetNamedItem("ConnectionDateSet").Value);
if (DateTime.Compare(currentStringDate, rollout.Connection.DateSet.Value) < 0 || String.IsNullOrEmpty(currentString))
{
connString = connNode.Attributes.GetNamedItem("ConnectionString").Value = rollout.Connection.ConnectionString;
connNode.Attributes.GetNamedItem("ConnectionDateSet").Value = rollout.Connection.DateSet.ToString();
}
else
{
connString = currentString;
}
}
catch (Exception)
{
connString = connNode.Attributes.GetNamedItem("ConnectionString").Value = rollout.Connection.ConnectionString;
connNode.Attributes.GetNamedItem("ConnectionDateSet").Value = rollout.Connection.DateSet.ToString();
}
}
else
{
connString = "";
}
return(connString);
}
private void reconstructBackEndFromRolloutsFolder(object sender, DoWorkEventArgs e)
{
//1. Create back end xml file to be updated.
CreateXmlFile.CreateBackEndXmlFileInRolloutDirectory();
var directory = new DirectoryInfo(this.RollOutDirectory + "Rollouts\\");
var fileCount = directory.EnumerateFiles("FE-*.zip").Count();
int progressPercentage = Convert.ToInt32(((double)1 / (fileCount + 1)) * 100);
(sender as BackgroundWorker).ReportProgress(progressPercentage, e.Argument);
int progress = 1;
//2. Loop through the zipped files in the rollouts folder
foreach (var file in directory.EnumerateFiles("FE-*.zip"))
{
//For each file, read the file into a ZipArchive object
ZipArchive zipfile = ZipFile.OpenRead(file.FullName);
//Find the only .xml file in the zip file and extract it to the reconstruction path.
zipfile.Entries.FirstOrDefault(p => p.Name.Contains(".xml")).ExtractToFile(this.ReconstructionPath, true);
//Release the object reference in memory to the zip file.
zipfile.Dispose();
//Create a rolloutInfo file (which is plain object with only properties and not methods) out of
//the newly extracted xml file.
DTO.RolloutInfo rollout = GetDataFromXml.GetReconstructedInfo(this.ReconstructionPath);
//Add a rollout record with the info in the rollout record.
UpdateXmlFile.AddRolloutRecord(rollout);
progressPercentage = Convert.ToInt32(((double)++progress / fileCount) * 100);
(sender as BackgroundWorker).ReportProgress(progressPercentage, "Reconstructed " + file.Name);
}
}
private static void addLatestRolloutToCache(ObjectCache cache, DTO.Enums.UserTypeEnum userType, DTO.Enums.BackEndOrFrontEndEnum whichEnd)
{
CacheItemPolicy policy = new CacheItemPolicy()
{
SlidingExpiration = TimeSpan.FromSeconds(10)
};
var rollout = new DTO.RolloutInfo();
rollout.UserType = userType;
var doc = GetXmlDoc.GetBackEndXmlDoc(DTO.Enums.BackEndOrFrontEndEnum.FrontEnd);
string currentVersion = doc.SelectSingleNode("//CurrentVersions").Attributes.GetNamedItem(rollout.UserTypeName).Value;
rollout.Connection.ConnectionString = GetData.GetCurrentConnectionString(whichEnd);
rollout.Connection.DateSet = DateTime.Parse(doc.SelectSingleNode("//ConnectionInfo").Attributes.GetNamedItem("ConnectionDateSet").Value);
rollout.DateTimeStamp = rollout.Connection.DateSet.Value;
XmlNode rolloutNode = doc.SelectSingleNode("//Version[@value='" + currentVersion + "']/" + Enum.GetName(typeof(DTO.Enums.UserTypeEnum), userType));
try
{
string launchFile = rolloutNode.Attributes.GetNamedItem("LaunchFile").Value;
rollout.LaunchFile = launchFile;
string zipPath = rolloutNode.Attributes.GetNamedItem("FullZipPath").Value;
rollout.ZipPath = zipPath;
}
catch (NullReferenceException)
{
throw new DTO.Exceptions.CouldNotFindValueException();
}
rollout.RolloutVersionString = currentVersion;
cache.Set("LatestRollout", rollout, policy);
}
public static bool CompareUserInfo(DTO.User user)
{
try
{
DTO.RolloutInfo currentRollout = GetDataFromXml.GetFrontEndSettings();
if (user.UserType != currentRollout.UserType)
{
return(true);
}
if (currentRollout.RolloutVersionNumber !=
GetDataFromXml.GetCurrentRolloutVersionNumber(DTO.Enums.BackEndOrFrontEndEnum.FrontEnd, user.UserType))
{
return(true);
}
}
catch (DTO.Exceptions.CouldNotFindValueException)
{
throw;
}
//This exception is raised when the front end has yet to be set up (i.e. first launch after install).
catch (DTO.Exceptions.FrontEndNeedsUpdateException)
{
return(true);
}
return(false);
}
//This is an important method for the FrontEnd. A DTO.RolloutInfo object is passed in and then this will
//update the frontend.xml file for the user with that info.
public static void UpdateFrontEndXml(DTO.RolloutInfo rollout)
{
var doc = GetXmlDoc.GetFrontEndXmlDoc();
doc.SelectSingleNode("//LaunchFile").InnerText = rollout.LaunchFile;
doc.SelectSingleNode("//CurrentUserType").InnerText = rollout.UserTypeName;
doc.SelectSingleNode("//CurrentVersion").InnerText = rollout.RolloutVersionString;
doc.SelectSingleNode("//CurrentZipPath").InnerText = rollout.ZipPath;
SaveXmlDoc.saveFrontEndDoc(doc);
}
//This will set the necessary rollout node attributes with the neccesary info from the RolloutInfo object
//Passed into it.
private static XmlNode setRolloutAttributes(XmlDocument doc, XmlNode node, DTO.RolloutInfo rollout)
{
XmlAttribute datestamp = doc.CreateAttribute("DateTimeStamp");
datestamp.Value = rollout.DateTimeStamp.ToString();
XmlAttribute zipPath = doc.CreateAttribute("FullZipPath");
zipPath.Value = rollout.ZipPath;
XmlAttribute launch = doc.CreateAttribute("LaunchFile");
launch.Value = rollout.LaunchFile;
node.Attributes.Append(launch);
node.Attributes.Append(datestamp);
node.Attributes.Append(zipPath);
return(node);
}
//This is a main function in the Back End tool. It takes a RolloutInfo object and with that info,
//it creates a new rollout record.
public static void AddRolloutRecord(DTO.RolloutInfo rollout)
{
var doc = GetXmlDoc.GetBackEndXmlDoc(DTO.Enums.BackEndOrFrontEndEnum.BackEnd);
//Compare current connection string and date and resolve for latest string
string latestConnectionString = compareConnectionStrings(ref doc, rollout);
XmlNode versionNode = doc.SelectSingleNode("//Version[@value='" + rollout.RolloutVersionString + "']");
//Check to see if a node for the current version exists
if (versionNode != null)
{
//If a node for the current version exists, then check if a rollout node exists for the specified userType
XmlNode rolloutNode = versionNode.SelectSingleNode("./" + rollout.UserTypeName);
if (rolloutNode != null)
{
//If a rollout node exists for the userType, then modify the values with the most up-to-date info.
rolloutNode = setRolloutAttributes(doc, rolloutNode, rollout);
}
else
{
//If a rollout node does NOT exist for the userType, then create one.
versionNode.AppendChild(createRolloutNode(doc, rollout));
}
}
//If a version node for the current version number does NOT exist, then create one with attributes set
else
{
XmlNode rolloutsNode = doc.SelectSingleNode("//BackEnd/RollOuts");
XmlElement newVersionNode = doc.CreateElement("Version");
newVersionNode.SetAttribute("value", rollout.RolloutVersionString);
newVersionNode.AppendChild(createRolloutNode(doc, rollout));
rolloutsNode.AppendChild(newVersionNode);
}
//Compare current version number with highest listed version number. If current is less than highest, update current.
ensureHighestVersionNumber(doc, rollout.UserTypeName);
ensureLatestRolloutDate(doc, rollout.DateTimeStamp);
//Create backup rollout document within zip folder
XmlNode newRolloutNode = doc.SelectSingleNode("//Version[@value='" + rollout.RolloutVersionString + "']").SelectSingleNode("./" + rollout.UserTypeName);
CreateXmlDoc.createBackupRolloutDocument(newRolloutNode, rollout.RolloutVersionNumber, latestConnectionString);
SaveXmlDoc.saveBackEndDoc(doc);
}
internal static DTO.RolloutInfo PullLatestRolloutFromCache(DTO.Enums.UserTypeEnum userType, DTO.Enums.BackEndOrFrontEndEnum whichEnd)
{
ObjectCache cache = MemoryCache.Default;
TryAgain:
DTO.RolloutInfo rollout = cache["LatestRollout"] as DTO.RolloutInfo;
try
{
if (rollout == null)
{
addLatestRolloutToCache(cache, userType, whichEnd);
goto TryAgain;
}
}
catch (Exception)
{
throw;
}
return(rollout);
}
private void reconstructBackEndFromRolloutsFolder()
{
//1. Create back end xml file to be updated.
CreateXmlFile.CreateBackEndXmlFileInRolloutDirectory();
var directory = new DirectoryInfo(this.RollOutDirectory + "Rollouts\\");
//2. Loop through the zipped files in the rollouts folder
foreach (var file in directory.EnumerateFiles("FE-*.zip"))
{
//For each file, read the file into a ZipArchive object
ZipArchive zipfile = ZipFile.OpenRead(file.FullName);
//Find the only .xml file in the zip file and extract it to the reconstruction path.
zipfile.Entries.FirstOrDefault(p => p.Name.Contains(".xml")).ExtractToFile(this.ReconstructionPath, true);
//Release the object reference in memory to the zip file.
zipfile.Dispose();
//Create a rolloutInfo file (which is plain object with only properties and not methods) out of
//the newly extracted xml file.
DTO.RolloutInfo rollout = GetDataFromXml.GetReconstructedInfo(this.ReconstructionPath);
//Add a rollout record with the info in the rollout record.
UpdateXmlFile.AddRolloutRecord(rollout);
}
}
//This creates and returns a rollout node after setting rollout attributes.
private static XmlNode createRolloutNode(XmlDocument doc, DTO.RolloutInfo rollout)
{
XmlElement newNode = doc.CreateElement(rollout.UserTypeName);
return(setRolloutAttributes(doc, newNode, rollout));
}
private static void updateFrontEndXML(DTO.Enums.UserTypeEnum userType)
{
DTO.RolloutInfo rollout = GetDataFromXml.GetLatestRollout(userType, DTO.Enums.BackEndOrFrontEndEnum.FrontEnd);
UpdateXmlFile.UpdateFrontEndXml(rollout);
}
internal static void AddRolloutRecord(DTO.RolloutInfo rollout)
{
XML.UpdateData.AddRolloutRecord(rollout);
}