e54c232c8c
Make the cache memory bounded, by using a LRU cache. Also split the
cache in a positive and negative one - each with its own controls.
Extend the cache stanza to allow for this:
cache {
positive limit [ttl]
negative limit [ttl]
}
is now possible. This also add a cache_test.go in the toplevel test/
directory that exercises the caching path.
Fixes #260
89 lines
2 KiB
Go
89 lines
2 KiB
Go
package test
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import (
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"io/ioutil"
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"log"
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"testing"
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"time"
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"github.com/miekg/coredns/middleware/proxy"
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"github.com/miekg/coredns/middleware/test"
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"github.com/miekg/coredns/request"
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"github.com/miekg/dns"
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)
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// This tests uses the exampleOrg zone as defined in proxy_test.go
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func TestLookupCache(t *testing.T) {
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// Start auth. CoreDNS holding the auth zone.
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name, rm, err := test.TempFile(t, ".", exampleOrg)
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if err != nil {
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t.Fatalf("failed to created zone: %s", err)
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}
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defer rm()
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corefile := `example.org:0 {
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file ` + name + `
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}
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`
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i, err := CoreDNSServer(corefile)
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if err != nil {
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t.Fatalf("Could not get CoreDNS serving instance: %s", err)
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}
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udp, _ := CoreDNSServerPorts(i, 0)
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if udp == "" {
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t.Fatalf("Could not get UDP listening port")
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}
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defer i.Stop()
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// Start caching proxy CoreDNS that we want to test.
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corefile = `example.org:0 {
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proxy . ` + udp + `
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cache
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}
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`
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i, err = CoreDNSServer(corefile)
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if err != nil {
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t.Fatalf("Could not get CoreDNS serving instance: %s", err)
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}
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udp, _ = CoreDNSServerPorts(i, 0)
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if udp == "" {
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t.Fatalf("Could not get UDP listening port")
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}
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defer i.Stop()
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log.SetOutput(ioutil.Discard)
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p := proxy.New([]string{udp})
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state := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
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resp, err := p.Lookup(state, "example.org.", dns.TypeA)
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if err != nil {
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t.Fatal("Expected to receive reply, but didn't")
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}
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// expect answer section with A record in it
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if len(resp.Answer) == 0 {
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t.Error("Expected to at least one RR in the answer section, got none")
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}
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ttl := resp.Answer[0].Header().Ttl
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time.Sleep(2 * time.Second) // TODO(miek): meh.
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resp, err = p.Lookup(state, "example.org.", dns.TypeA)
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if err != nil {
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t.Fatal("Expected to receive reply, but didn't")
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}
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// expect answer section with A record in it
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if len(resp.Answer) == 0 {
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t.Error("Expected to at least one RR in the answer section, got none")
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}
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newTTL := resp.Answer[0].Header().Ttl
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if newTTL >= ttl {
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t.Errorf("Expected TTL to be lower than: %d, got %d", ttl, newTTL)
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}
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}
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