// [Route("Hello")]
public async Task HelloAsync(HelloAction action)
{
var connectionId = CurrentRequest.RequestContext.ConnectionId;
LogInfo($"Hello: {connectionId}");
// retrieve websocket connection record
var connection = await _dataTable.GetConnectionAsync(connectionId);
if (connection == null)
{
LogInfo("Connection was removed");
return;
}
// subscribe websocket to SNS topic notifications
connection.SubscriptionArn = (await _snsClient.SubscribeAsync(new SubscribeRequest {
Protocol = "https",
Endpoint = $"{_broadcastApiUrl}?ws={connectionId}&token={_httpApiToken}&rid={action.RequestId}",
ReturnSubscriptionArn = true,
TopicArn = _eventTopicArn
})).SubscriptionArn;
// update connection record
await _dataTable.UpdateConnectionAsync(connection);
}
// [Route("Hello")]
public async Task HelloAsync(HelloAction action)
{
var connectionId = CurrentRequest.RequestContext.ConnectionId;
LogInfo($"Hello: {connectionId}");
// retrieve connection record
var connection = await _dataTable.GetConnectionRecordAsync(connectionId);
if (connection == null)
{
LogInfo("Connection was removed");
throw Abort(action.AcknowledgeError("connection gone"));
}
if (connection.State == ConnectionState.Failed)
{
LogInfo("Connection is in failed state");
throw Abort(action.AcknowledgeError("connection reset required"));
}
if (connection.State != ConnectionState.New)
{
LogInfo("Client has already announced itself (state: {0})", connection.State);
throw Abort(action.AcknowledgeError("client is already announced"));
}
if (!await _dataTable.UpdateConnectionRecordStateAsync(connection, ConnectionState.Pending))
{
LogInfo($"Unable to update connection state from '{connection.State}' to '{ConnectionState.Pending}'");
throw Abort(action.AcknowledgeError("client is already being announced"));
}
// subscribe websocket to SNS topic notifications
try {
await _snsClient.SubscribeAsync(new SubscribeRequest {
Protocol = "https",
Endpoint = $"{_broadcastApiUrl}?ws={connectionId}&token={_httpApiToken}&rid={action.RequestId}",
TopicArn = _eventTopicArn
});
} catch (Exception e) {
LogError(e, "failed to subscribe to SNS topic");
await _dataTable.SetConnectionRecordStateAsync(connection, ConnectionState.Failed);
throw Abort(action.AcknowledgeError("internal error"));
}
// NOTE (2021-03-23, bjorg): the `AcknowledgeAction` response is sent by the `BroadcastFunction` when the subscription is enabled
}