Hi!
I am trying to write Prometheus exporter for stats queried fro the Kea
DHCP server. Unfortunatly, the JSON is structured very badly if I want
to use the base library JSON Unmarshal functionality:
{
"arguments": {
"cumulative-assigned-addresses": [ [ 1, "2023-09-13
12:08:09.597483" ], ... ],
"pkt4-decline-received": [ [ 0, "2023-09-13
08:01:35.964113" ], ... ],
"subnet[1].assigned-addresses": [ [ 1, "2023-09-13
08:01:36.014127" ], ... ],
"subnet[1].cumulative-assigned-addresses": [ [ 0, "2023-09-13
08:01:36.014006" ], ... ],
"subnet[1].declined-addresses": [ [ 0, "2023-09-13
08:01:36.014069" ], ... ],
"subnet[1].reclaimed-declined-addresses": [ [ 0, "2023-09-13
08:01:36.014074" ], ... ],
"subnet[1].reclaimed-leases": [ [ 0, "2023-09-13
08:01:36.014080" ], ... ],
"subnet[1].total-addresses": [ [ 15, "2023-09-13
08:01:36.013997" ], ... ],
"subnet[1].v4-reservation-conflicts": [ [ 0, "2023-09-13
08:01:36.014010" ], ... ],
"subnet[2].assigned-addresses": [ [ 4, "2023-09-14
13:32:20.906085" ], ... ],
"subnet[2].cumulative-assigned-addresses": [ [ 4, "2023-09-14
13:32:20.906090" ], ... ],
"subnet[2].declined-addresses": [ [ 0, "2023-09-13
08:01:36.014088" ], ... ],
"subnet[2].reclaimed-declined-addresses": [ [ 0, "2023-09-13
08:01:36.014096" ], ... ],
"subnet[2].reclaimed-leases": [ [ 3, "2023-09-14
00:08:10.270122" ], ... ],
"subnet[2].total-addresses": [ [ 223, "2023-09-13
08:01:36.014015" ], ... ],
"subnet[2].v4-reservation-conflicts": [ [ 0, "2023-09-13
08:01:36.014025" ], ... ],
"subnet[3].assigned-addresses": [ [ 1, "2023-09-13
08:01:36.014135" ], ... ]
... rest of subnet[3] and more subnets
},
"result": 0
}
The int, timestamp lists are already Not Great, but I can deal with
those.
The problem is the series of subnet[x] fields. They vary depending on
how many subnets the server serves, and nothing in the JSON indicates
how many there are. And even if it did: getting the stdlib JSON
Unmarshaler to actually pick them up (without hardcoded struct tags)
seems impossible, short of essentially writing my own JSON Unmarshaler
from scratch.
So I have three questions:
1. Am I missing some wildcard-ish functionality where I can tell the
stdlib JSON Unmarshaler just make a slice out of all the JSON
elements that fit a pattern?
2. Is there a Golang JSON library that is better suited to dealing with
this?
3. What other options do I have (besides "use another
language/exporter", "make upstream produce better JSON" and "write
your own parser")?
Best & TIA,
Tobias
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/golang-nuts/e6ffa963-ded4-4526-9ba4-30237e34a114%40skade.local.
