InfluxDB3 support

[martinfierz]

Proposal:
There is a new version of InfluxDB, version 3. This client supports versions 1 and 2 (but not 3), as per the readme.

Current behavior:
I naively tried to use the InfluxDB for v2 example but I get the error message
InfluxDB connection failed: connection failed

Desired behavior:
A working connection to InfluxDB3

Alternatives considered:
none

Use case:
InfluxDB v3 is the latest version, it would be nice if you supported it.

[vlastahajek]

@martinfierz,
InfluxDB 3 has a backward compatibility API, which allows V2 clients to write.

You haven't shared any information about the server (if you use InfuxDB Cloud or InfuxDB 3 Core locally).
I suppose you are using InfuxDB Cloud.

The example for InfluxDB v2 works (setting URL, organization, database/bucket, and token) for InfluxDB 3 Cloud (Serverless, not Cloud Dedicated) and Enterprise, but you also need to instruct the client to skip validation, because the server uses a different certificate than the one currently in the trust store.

Uncomment, or if it is missing, add the following statement before validating the connection:
client.setInsecure(true);

In case of InfluxDB 3 Core, there is no organization; you have to fill in "fake" organization to pass the parameter check.

However, the query will not work because InfluxDB 3 doesn't support Flux.

I will add support for querying InfluxQL from V1, V2, and V3, and also SQL from V3.

[martinfierz]

@vlastahajek thank you for the response! I use Influx Cloud Serverless (3). I will check if your suggestion above (with the client.setInsecure(true)) will do the job!