public static DeploymentStatusFile Open(string id, IEnvironment environment, IAnalytics analytics, IOperationLock statusLock)
{
// status complete file is created infrequently at deployment completion time
// once deployment is completed, it is highly unlikely its status will change
// this helps optimize status read operation avoid taking status lock
DeploymentStatusFile statusComplete = null;
OperationManager.SafeExecute(() =>
{
string path = Path.Combine(environment.DeploymentsPath, id, StatusCompleteFile);
if (FileSystemHelpers.FileExists(path))
{
if (ScmHostingConfigurations.DeploymentStatusCompleteFileEnabled)
{
statusComplete = new DeploymentStatusFile(id, environment, statusLock, FileSystemCache.ReadXml(path));
}
else
{
FileSystemHelpers.DeleteFile(path);
}
}
});
return(statusComplete ?? statusLock.LockOperation(() =>
{
string path = Path.Combine(environment.DeploymentsPath, id, StatusFile);
if (!FileSystemHelpers.FileExists(path))
{
return null;
}
try
{
XDocument document = null;
using (var stream = FileSystemHelpers.OpenRead(path))
{
document = XDocument.Load(stream);
}
return new DeploymentStatusFile(id, environment, statusLock, document);
}
catch (Exception ex)
{
// in the scenario where w3wp is abruptly terminated while xml is being written,
// we may end up with corrupted xml. we will handle the error and remove the problematic directory.
analytics.UnexpectedException(ex);
FileSystemHelpers.DeleteDirectorySafe(Path.GetDirectoryName(path), ignoreErrors: true);
// it is ok to return null as callers already handle null.
return null;
}
}, "Getting deployment status", DeploymentStatusManager.LockTimeout));
}
