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plugin/view: Advanced routing interface and new 'view' plugin (#5538)

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* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block.
* add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block.

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
Chris O'Haver 2022-09-08 14:56:27 -04:00 • committed by GitHub
parent 1f0a41a665
commit b56b080a7c
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GPG key ID: 4AEE18F83AFDEB23
36 changed files with 880 additions and 114 deletions
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11
plugin/cache/cache.go vendored
View file

@ -22,6 +22,7 @@ type Cache struct {
Zones []string
zonesMetricLabel string
viewMetricLabel string
ncache *cache.Cache
ncap int
@ -177,11 +178,11 @@ func (w *ResponseWriter) WriteMsg(res *dns.Msg) error {
if hasKey && duration > 0 {
if w.state.Match(res) {
w.set(res, key, mt, duration)
cacheSize.WithLabelValues(w.server, Success, w.zonesMetricLabel).Set(float64(w.pcache.Len()))
cacheSize.WithLabelValues(w.server, Denial, w.zonesMetricLabel).Set(float64(w.ncache.Len()))
cacheSize.WithLabelValues(w.server, Success, w.zonesMetricLabel, w.viewMetricLabel).Set(float64(w.pcache.Len()))
cacheSize.WithLabelValues(w.server, Denial, w.zonesMetricLabel, w.viewMetricLabel).Set(float64(w.ncache.Len()))
} else {
// Don't log it, but increment counter
cacheDrops.WithLabelValues(w.server, w.zonesMetricLabel).Inc()
cacheDrops.WithLabelValues(w.server, w.zonesMetricLabel, w.viewMetricLabel).Inc()
}
}
@ -219,7 +220,7 @@ func (w *ResponseWriter) set(m *dns.Msg, key uint64, mt response.Type, duration
i.wildcard = w.wildcardFunc()
}
if w.pcache.Add(key, i) {
evictions.WithLabelValues(w.server, Success, w.zonesMetricLabel).Inc()
evictions.WithLabelValues(w.server, Success, w.zonesMetricLabel, w.viewMetricLabel).Inc()
}
// when pre-fetching, remove the negative cache entry if it exists
if w.prefetch {
@ -236,7 +237,7 @@ func (w *ResponseWriter) set(m *dns.Msg, key uint64, mt response.Type, duration
i.wildcard = w.wildcardFunc()
}
if w.ncache.Add(key, i) {
evictions.WithLabelValues(w.server, Denial, w.zonesMetricLabel).Inc()
evictions.WithLabelValues(w.server, Denial, w.zonesMetricLabel, w.viewMetricLabel).Inc()
}
case response.OtherError: