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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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12
plugin/cache/handler.go vendored
View file

@ -60,7 +60,7 @@ func (c *Cache) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
cw := newPrefetchResponseWriter(server, state, c)
go c.doPrefetch(ctx, state, cw, i, now)
}
servedStale.WithLabelValues(server, c.zonesMetricLabel).Inc()
servedStale.WithLabelValues(server, c.zonesMetricLabel, c.viewMetricLabel).Inc()
} else if c.shouldPrefetch(i, now) {
cw := newPrefetchResponseWriter(server, state, c)
go c.doPrefetch(ctx, state, cw, i, now)
@ -89,7 +89,7 @@ func wildcardFunc(ctx context.Context) func() string {
}
func (c *Cache) doPrefetch(ctx context.Context, state request.Request, cw *ResponseWriter, i *item, now time.Time) {
cachePrefetches.WithLabelValues(cw.server, c.zonesMetricLabel).Inc()
cachePrefetches.WithLabelValues(cw.server, c.zonesMetricLabel, c.viewMetricLabel).Inc()
c.doRefresh(ctx, state, cw)
// When prefetching we loose the item i, and with it the frequency
@ -122,13 +122,13 @@ func (c *Cache) Name() string { return "cache" }
// getIgnoreTTL unconditionally returns an item if it exists in the cache.
func (c *Cache) getIgnoreTTL(now time.Time, state request.Request, server string) *item {
k := hash(state.Name(), state.QType())
cacheRequests.WithLabelValues(server, c.zonesMetricLabel).Inc()
cacheRequests.WithLabelValues(server, c.zonesMetricLabel, c.viewMetricLabel).Inc()
if i, ok := c.ncache.Get(k); ok {
itm := i.(*item)
ttl := itm.ttl(now)
if itm.matches(state) && (ttl > 0 || (c.staleUpTo > 0 && -ttl < int(c.staleUpTo.Seconds()))) {
cacheHits.WithLabelValues(server, Denial, c.zonesMetricLabel).Inc()
cacheHits.WithLabelValues(server, Denial, c.zonesMetricLabel, c.viewMetricLabel).Inc()
return i.(*item)
}
}
@ -136,11 +136,11 @@ func (c *Cache) getIgnoreTTL(now time.Time, state request.Request, server string
itm := i.(*item)
ttl := itm.ttl(now)
if itm.matches(state) && (ttl > 0 || (c.staleUpTo > 0 && -ttl < int(c.staleUpTo.Seconds()))) {
cacheHits.WithLabelValues(server, Success, c.zonesMetricLabel).Inc()
cacheHits.WithLabelValues(server, Success, c.zonesMetricLabel, c.viewMetricLabel).Inc()
return i.(*item)
}
}
cacheMisses.WithLabelValues(server, c.zonesMetricLabel).Inc()
cacheMisses.WithLabelValues(server, c.zonesMetricLabel, c.viewMetricLabel).Inc()
return nil
}