Look up IP addresses by prefix at each mask length (closes #48)

Looking up an address on /ip/ and /api/v1/ip/ read every IPv6 live route and about half of the IPv4 range index, so on a day-sized database it passed the 30-second request timeout. The lookup is now one function for both families: from the longest mask length down, it looks up the address's network prefix on the existing prefix index, and the first live route wins. The feed sends IPv6 withdrawals uncompressed, so they never matched the stored compressed prefix and never removed a route. Prefixes are now stored in the text form net/netip prints, so IPv6 withdrawals take effect. ip_start, ip_end and GetASInfoForIP are removed; nothing read them. A database from before this change must be deleted. Model: opus-5-5
2026-10-03 16:04:38 +02:00
parent 7322f936e4
commit 32704c601e
11 changed files with 247 additions and 705 deletions
@@ -28,6 +28,11 @@ The other open issue is https://git.eeqj.de/sneak/routewatch/issues/30.

 # Completed Steps

+- 2026-10-03: looking up an IP address no longer reads every IPv6 route:
+  both families find the most specific live route with at most 33 or 129
+  lookups on the prefix index, and the IPv4 range columns are gone. Prefixes
+  from the feed are stored in one text form, so an IPv6 withdrawal, which the
+  feed sends uncompressed, now removes its route (closes #48)
 - 2026-10-02: a plain `docker build .` stamps the commit's tag or short
  commit (`git describe --tags --always`) into the page footer instead of
  `unknown`: `.dockerignore` sends `.git` without `.git/config`, a `VERSION`