/// <summary>
/// Deletes CAN object from CAN server.
/// </summary>
/// <param name="ObjectPath">CAN path to the object.</param>
/// <returns>Structure describing whether the function succeeded and response provided by CAN server.</returns>
public async Task <CanDeleteResult> CanDeleteObject(string ObjectPath)
{
log.Trace("(ObjectPath:'{0}')", ObjectPath);
NameValueCollection args = new NameValueCollection();
args.Add("arg", ObjectPath);
CanApiResult apiResult = await SendRequest("pin/rm", args);
CanDeleteResult res = CanDeleteResult.FromApiResult(apiResult);
log.Trace("(-):{0}", res);
return(res);
}
/// <summary>
/// Creates a new object based on a result from CAN API including validation checks.
/// </summary>
/// <param name="ApiResult">CAN API result object to copy values from.</param>
/// <returns>Structure describing result of CAN upload operation.</returns>
public static CanDeleteResult FromApiResult(CanApiResult ApiResult)
{
log.Trace("()");
CanDeleteResult res = new CanDeleteResult(ApiResult);
if (res.Success)
{
bool error = false;
try
{
CanDeleteObjectResponse response = JsonConvert.DeserializeObject <CanDeleteObjectResponse>(res.DataStr);
res.Pins = response.Pins;
// If the object was deleted previously, we might have empty Pins in response.
// We are thus OK if we receive success response and no more validation is done.
}
catch (Exception e)
{
log.Error("Exception occurred: {0}", e.ToString());
error = true;
}
if (error)
{
res.Success = false;
res.Message = "Invalid CAN response.";
res.IsCanError = false;
}
}
else if (res.Message.ToLowerInvariant() == "not pinned")
{
res.Success = true;
res.Pins = null;
}
log.Trace("(-)");
return(res);
}
/// <summary>
/// Thread that is initializes CAN objects during the profile server startup.
/// </summary>
private async void InitThread()
{
log.Info("()");
initThreadFinished.Reset();
if (Base.Configuration.CanProfileServerContactInformationHash != null)
{
log.Debug("Old CAN object hash is '{0}', object {1} change.", Base.Configuration.CanProfileServerContactInformationHash.ToBase58(), Base.Configuration.CanProfileServerContactInformationChanged ? "DID" : "did NOT");
}
else
{
log.Debug("No CAN object found.");
}
bool deleteOldObject = Base.Configuration.CanProfileServerContactInformationChanged && (Base.Configuration.CanProfileServerContactInformationHash != null);
byte[] canObject = canContactInformation.ToByteArray();
log.Trace("CAN object: {0}", canObject.ToHex());
while (!ShutdownSignaling.IsShutdown)
{
// First delete old CAN object if there is any.
bool error = false;
if (deleteOldObject)
{
string objectPath = CanApi.CreateIpfsPathFromHash(Base.Configuration.CanProfileServerContactInformationHash);
CanDeleteResult cres = await canApi.CanDeleteObject(objectPath);
if (cres.Success)
{
log.Info("Old CAN object hash '{0}' deleted.", Base.Configuration.CanProfileServerContactInformationHash.ToBase58());
}
else
{
log.Warn("Failed to delete old CAN object hash '{0}', error message '{1}', will retry.", Base.Configuration.CanProfileServerContactInformationHash.ToBase58(), cres.Message);
error = true;
}
}
else
{
log.Trace("No old object to delete.");
}
if (ShutdownSignaling.IsShutdown)
{
break;
}
if (!error)
{
if (Base.Configuration.CanProfileServerContactInformationChanged)
{
// Now upload the new object.
CanUploadResult cres = await canApi.CanUploadObject(canObject);
if (cres.Success)
{
canContactInformationHash = cres.Hash;
log.Info("New CAN object hash '{0}' added.", canContactInformationHash.ToBase58());
break;
}
log.Warn("Unable to add new object to CAN, error message: '{0}'", cres.Message);
}
else
{
canContactInformationHash = Base.Configuration.CanProfileServerContactInformationHash;
log.Info("CAN object unchanged since last time, hash is '{0}'.", canContactInformationHash.ToBase58());
break;
}
}
// Retry in 10 seconds.
try
{
await Task.Delay(10000, ShutdownSignaling.ShutdownCancellationTokenSource.Token);
}
catch
{
// Catch cancellation exception.
}
}
if (canContactInformationHash != null)
{
if (Base.Configuration.CanProfileServerContactInformationChanged)
{
// Save the new data to the database.
if (!await SaveProfileServerContactInformation())
{
log.Error("Failed to save new profile server contact information values to database.");
}
}
// Finally, start IPNS record refreshing timer.
await IpnsRecordRefresh();
}
initThreadFinished.Set();
log.Info("(-)");
}
