kilo/pkg/iptables/rulecache_test.go

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// Copyright 2021 the Kilo authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package iptables
import (
"testing"
)
func TestRuleCache(t *testing.T) {
for _, tc := range []struct {
name string
rules []Rule
check []Rule
out []bool
calls uint64
}{
{
name: "empty",
rules: nil,
check: []Rule{rules[0]},
out: []bool{false},
calls: 1,
},
{
name: "single negative",
rules: []Rule{rules[1]},
check: []Rule{rules[0]},
out: []bool{false},
calls: 1,
},
{
name: "single positive",
rules: []Rule{rules[1]},
check: []Rule{rules[1]},
out: []bool{true},
calls: 1,
},
{
name: "single chain",
rules: []Rule{&chain{"nat", "KILO-NAT", ProtocolIPv4}},
check: []Rule{&chain{"nat", "KILO-NAT", ProtocolIPv4}},
out: []bool{true},
calls: 1,
},
{
name: "rule on chain means chain exists",
rules: []Rule{rules[0]},
check: []Rule{rules[0], &chain{"filter", "FORWARD", ProtocolIPv4}},
out: []bool{true, true},
calls: 1,
},
{
name: "rule on chain does not mean table is fully populated",
rules: []Rule{rules[0], &chain{"filter", "INPUT", ProtocolIPv4}},
check: []Rule{rules[0], &chain{"filter", "OUTPUT", ProtocolIPv4}, &chain{"filter", "INPUT", ProtocolIPv4}},
out: []bool{true, false, true},
calls: 2,
},
{
name: "multiple rules on chain",
rules: []Rule{rules[0], rules[1]},
check: []Rule{rules[0], rules[1], &chain{"filter", "FORWARD", ProtocolIPv4}},
out: []bool{true, true, true},
calls: 1,
},
{
name: "checking rule on chain does not mean chain exists",
rules: nil,
check: []Rule{rules[0], &chain{"filter", "FORWARD", ProtocolIPv4}},
out: []bool{false, false},
calls: 2,
},
{
name: "multiple chains on same table",
rules: nil,
check: []Rule{&chain{"filter", "INPUT", ProtocolIPv4}, &chain{"filter", "FORWARD", ProtocolIPv4}},
out: []bool{false, false},
calls: 1,
},
{
name: "multiple chains on different table",
rules: nil,
check: []Rule{&chain{"filter", "INPUT", ProtocolIPv4}, &chain{"nat", "POSTROUTING", ProtocolIPv4}},
out: []bool{false, false},
calls: 2,
},
} {
controller := &Controller{}
client := &fakeClient{}
controller.v4 = client
controller.v6 = client
if err := controller.Set(tc.rules); err != nil {
t.Fatalf("test case %q: Set should not fail: %v", tc.name, err)
}
// Reset the client's calls so we can examine how many times
// the rule cache performs operations.
client.calls = 0
var rc ruleCache
for i := range tc.check {
ok, err := rc.exists(controller.client(tc.check[i].Proto()), tc.check[i])
if err != nil {
t.Fatalf("test case %q check %d: check should not fail: %v", tc.name, i, err)
}
if ok != tc.out[i] {
t.Errorf("test case %q check %d: expected %t, got %t", tc.name, i, tc.out[i], ok)
}
}
if client.calls != tc.calls {
t.Errorf("test case %q: expected client to be called %d times, got %d", tc.name, tc.calls, client.calls)
}
}
}