public static async Task <string> GetPreviousVersionGuid(string branch, string versionGuid, bool retry = true)
{
StudioDeployLogs deployLogs = await GetDeployLogs(branch);
if (deployLogs.LookupFromGuid.ContainsKey(versionGuid))
{
StudioDeployLog currentLog = deployLogs.LookupFromGuid[versionGuid];
int previousVersion = currentLog.Version - 1;
if (deployLogs.LookupFromVersion.ContainsKey(previousVersion))
{
StudioDeployLog previousLog = deployLogs.LookupFromVersion[previousVersion];
return(previousLog.VersionGuid);
}
else
{
throw new Exception("Could not resolve previous version.");
}
}
else if (retry)
{
// The cache might be invalid now? Try rebuilding it.
Logs.Remove(branch);
return(await GetPreviousVersionGuid(branch, versionGuid, false));
}
else
{
throw new Exception("Unknown version guid: " + versionGuid);
}
}
public static async Task <StudioDeployLogs> GetDeployLogs(string branch)
{
if (!Logs.ContainsKey(branch))
{
string deployHistoryUrl = "https://s3.amazonaws.com/setup." + branch + ".com/DeployHistory.txt";
string deployHistory;
using (WebClient http = new WebClient())
deployHistory = await http.DownloadStringTaskAsync(deployHistoryUrl);
StudioDeployLogs deployLogs = new StudioDeployLogs(deployHistory);
Logs.Add(branch, deployLogs);
}
return(Logs[branch]);
}