public async Task SendMessageAsync(Message request)
{
// enumerate open connections
var connections = await _connections.GetAllRowsAsync();
LogInfo($"Found {connections.Count()} open connection(s)");
// attempt to send message on all open connections
var messageBytes = Encoding.UTF8.GetBytes(LambdaSerializer.Serialize(new Message {
From = request.From,
Text = request.Text
}));
var outcomes = await Task.WhenAll(connections.Select(async(connectionId, index) => {
LogInfo($"Post to connection {index}: {connectionId}");
try {
await _amaClient.PostToConnectionAsync(new PostToConnectionRequest {
ConnectionId = connectionId,
Data = new MemoryStream(messageBytes)
});
} catch (AmazonServiceException e) when(e.StatusCode == System.Net.HttpStatusCode.Gone)
{
LogInfo($"Deleting gone connection: {connectionId}");
await _connections.DeleteRowAsync(connectionId);
return(false);
} catch (Exception e) {
LogErrorAsWarning(e, "PostToConnectionAsync() failed");
return(false);
}
return(true);
}));
LogInfo($"Data sent to {outcomes.Count(result => result)} connections");
}
public async Task CloseConnectionAsync(APIGatewayProxyRequest request)
{
try {
LogInfo($"Disconnected: {request.RequestContext.ConnectionId} [{request.RequestContext.RouteKey}]");
await _connections.DeleteRowAsync(request.RequestContext.ConnectionId);
} catch (Exception e) {
LogError(e);
throw Abort(CreateResponse(500, $"Failure while attempting to disconnect: {e.Message}"));
}
}
