data is relayed when database does not exist in InfluxDB

[dpajin]

Hi strike-team,

Thanks for maintaining this project.

I experience one issue/behavior for which I believe it is not correct. I see that the data is not buffered, but relayed, in case that InfluxDB is up, but the database does not exist. I think that influxdb-relay should check if database exists and only then relay data. Otherwise, the data is "black-holed" and the point of buffering feature is lost.

I will give one example use case: I have multiple nodes which receive data from influxdb relay. When one node fails, the relay will start buffering... When I recover node, my InfluxDB instance still does not have any database created. I would like to first recover my databases from the backup and then get the buffered data from influxdb-relay. However, as soon as InfluxDB is up, the influxdb-relay will send the data and clear the buffer, even though the database is still not created in InfluxDB instance.

many thanks!