private void ParseLine(string json)
{
// reset error count and backoff flag
_hardErrorCount = 0;
_backoffMode = BackoffMode.None;
_stateUpdater.UpdateState();
ConnectionState = UserStreamsConnectionState.Connected;
UserStreamParser.ParseStreamLine(json, _handler);
}
public UserStreamReceiver(ApiAccessor accessor, IStreamHandler handler)
{
_accessor = accessor;
_handler = handler;
ChangeState(StreamState.Disconnected);
// set default values to parameters
StallWarnings = true;
StreamFilterLevel = StreamFilterLevel.None;
_currentState = StreamState.Connected;
_backoffMode = BackoffMode.None;
_backoffWait = 0;
_hardErrorCount = 0;
}
private async Task <bool> HandleException(Exception ex)
{
Log("Exception on User Stream Receiver: " + Environment.NewLine + ex);
var tx = ex as TwitterApiException;
if (tx != null)
{
// protocol error
Log($"Twitter API Exception: [status-code: {tx.StatusCode} twitter-code: {tx.TwitterErrorCode}]");
_stateUpdater.UpdateState(_account.UnreliableScreenName +
ReceivingResources.UserStreamDisconnectedFormat.SafeFormat(
(int)tx.StatusCode, tx.TwitterErrorCode));
_handler.OnMessage(new StreamErrorMessage(_account, tx.StatusCode, tx.TwitterErrorCode));
switch (tx.StatusCode)
{
case HttpStatusCode.Unauthorized:
Log("Authorization failed.");
if (_hardErrorCount > MaxHardErrorCount)
{
return(false);
}
break;
case HttpStatusCode.Forbidden:
case HttpStatusCode.NotFound:
Log("Endpoint not found / not accessible.");
if (_hardErrorCount > MaxHardErrorCount)
{
return(false);
}
break;
case HttpStatusCode.NotAcceptable:
case HttpStatusCode.RequestEntityTooLarge:
Log("Specified argument could not be accepted.");
return(false);
case HttpStatusCode.RequestedRangeNotSatisfiable:
Log("Permission denied / Parameter out of range");
return(false);
case (HttpStatusCode)420: // Too many connections
Log("Too many connections are established.");
return(false);
}
// general protocol error
if (_backoffMode == BackoffMode.ProtocolError)
{
// exponential backoff
_backoffWait *= 2;
}
else
{
_backoffWait = ProtocolErrorInitialWait;
_backoffMode = BackoffMode.ProtocolError;
}
if (_backoffWait >= ProtocolErrorMaxWait)
{
Log("Protocol backoff limit exceeded.");
_stateUpdater.UpdateState(_account.UnreliableScreenName + ": " +
ReceivingResources.ConnectFailedByProtocol);
return(false);
}
}
else
{
// network error
if (_backoffMode == BackoffMode.NetworkError)
{
// linear backoff
_backoffWait += NetworkErrorInitialWait;
}
else
{
_backoffWait = NetworkErrorInitialWait;
_backoffMode = BackoffMode.NetworkError;
}
if (_backoffWait >= NetworkErrorMaxWait)
{
Log("Network backoff limit exceeded.");
_stateUpdater.UpdateState(_account.UnreliableScreenName + ": " +
ReceivingResources.ConnectFailedByNetwork);
return(false);
}
}
Log($"Waiting reconnection... [{_backoffWait} ms]");
_stateUpdater.UpdateState(_account.UnreliableScreenName + ": " +
ReceivingResources.ReconnectingFormat.SafeFormat(_backoffWait));
_handler.OnMessage(new StreamWaitMessage(_account, _backoffWait));
await Task.Delay(TimeSpan.FromMilliseconds(_backoffWait)).ConfigureAwait(false);
return(true);
}
private async Task<bool> HandleException(Exception ex)
{
Log("Exception on User Stream Receiver: " + Environment.NewLine + ex);
var tx = ex as TwitterApiException;
if (tx != null)
{
// protocol error
Log($"Twitter API Exception: [status-code: {tx.StatusCode} twitter-code: {tx.TwitterErrorCode}]");
_handler.OnMessage(new StreamErrorMessage(_accessor, tx.StatusCode, tx.TwitterErrorCode));
switch (tx.StatusCode)
{
case HttpStatusCode.Unauthorized:
Log("Authorization failed.");
if (_hardErrorCount > MaxHardErrorCount)
{
return false;
}
break;
case HttpStatusCode.Forbidden:
case HttpStatusCode.NotFound:
Log("Endpoint not found / not accessible.");
if (_hardErrorCount > MaxHardErrorCount)
{
return false;
}
break;
case HttpStatusCode.NotAcceptable:
case HttpStatusCode.RequestEntityTooLarge:
Log("Specified argument could not be accepted.");
return false;
case HttpStatusCode.RequestedRangeNotSatisfiable:
Log("Permission denied / Parameter out of range");
return false;
case (HttpStatusCode)420: // Too many connections
Log("Too many connections are established.");
return false;
}
// general protocol error
if (_backoffMode == BackoffMode.ProtocolError)
{
// exponential backoff
_backoffWait *= 2;
}
else
{
_backoffWait = ProtocolErrorInitialWait;
_backoffMode = BackoffMode.ProtocolError;
}
if (_backoffWait >= ProtocolErrorMaxWait)
{
Log("Protocol backoff limit exceeded.");
return false;
}
}
else
{
// network error
if (_backoffMode == BackoffMode.NetworkError)
{
// linear backoff
_backoffWait += NetworkErrorInitialWait;
}
else
{
_backoffWait = NetworkErrorInitialWait;
_backoffMode = BackoffMode.NetworkError;
}
if (_backoffWait >= NetworkErrorMaxWait)
{
Log("Network backoff limit exceeded.");
return false;
}
}
Log($"Waiting reconnection... [{_backoffWait} ms]");
_handler.OnMessage(new StreamWaitMessage(_accessor, _backoffWait));
await Task.Delay(TimeSpan.FromMilliseconds(_backoffWait)).ConfigureAwait(false);
return true;
}
private void ParseLine(string json)
{
// reset error count and backoff flag
_hardErrorCount = 0;
_backoffMode = BackoffMode.None;
ChangeState(StreamState.Connected);
UserStreamParser.ParseStreamLine(json, _handler);
}