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tailscale/internal/deephash/deephash_test.go

135 lines
3.4 KiB
Go

// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package deephash
import (
"bufio"
"bytes"
"fmt"
"reflect"
"testing"
"inet.af/netaddr"
"tailscale.com/tailcfg"
"tailscale.com/util/dnsname"
"tailscale.com/wgengine/router"
"tailscale.com/wgengine/wgcfg"
)
func TestDeepPrint(t *testing.T) {
// v contains the types of values we care about for our current callers.
// Mostly we're just testing that we don't panic on handled types.
v := getVal()
hash1 := Hash(v)
t.Logf("hash: %v", hash1)
for i := 0; i < 20; i++ {
hash2 := Hash(getVal())
if hash1 != hash2 {
t.Error("second hash didn't match")
}
}
}
func getVal() []interface{} {
return []interface{}{
&wgcfg.Config{
Name: "foo",
Addresses: []netaddr.IPPrefix{netaddr.IPPrefixFrom(netaddr.IPFrom16([16]byte{3: 3}), 5)},
Peers: []wgcfg.Peer{
{
Endpoints: wgcfg.Endpoints{
IPPorts: wgcfg.NewIPPortSet(netaddr.MustParseIPPort("42.42.42.42:5")),
},
},
},
},
&router.Config{
Routes: []netaddr.IPPrefix{
netaddr.MustParseIPPrefix("1.2.3.0/24"),
netaddr.MustParseIPPrefix("1234::/64"),
},
},
map[dnsname.FQDN][]netaddr.IP{
dnsname.FQDN("a."): {netaddr.MustParseIP("1.2.3.4"), netaddr.MustParseIP("4.3.2.1")},
dnsname.FQDN("b."): {netaddr.MustParseIP("8.8.8.8"), netaddr.MustParseIP("9.9.9.9")},
dnsname.FQDN("c."): {netaddr.MustParseIP("6.6.6.6"), netaddr.MustParseIP("7.7.7.7")},
dnsname.FQDN("d."): {netaddr.MustParseIP("6.7.6.6"), netaddr.MustParseIP("7.7.7.8")},
dnsname.FQDN("e."): {netaddr.MustParseIP("6.8.6.6"), netaddr.MustParseIP("7.7.7.9")},
dnsname.FQDN("f."): {netaddr.MustParseIP("6.9.6.6"), netaddr.MustParseIP("7.7.7.0")},
},
map[dnsname.FQDN][]netaddr.IPPort{
dnsname.FQDN("a."): {netaddr.MustParseIPPort("1.2.3.4:11"), netaddr.MustParseIPPort("4.3.2.1:22")},
dnsname.FQDN("b."): {netaddr.MustParseIPPort("8.8.8.8:11"), netaddr.MustParseIPPort("9.9.9.9:22")},
dnsname.FQDN("c."): {netaddr.MustParseIPPort("8.8.8.8:12"), netaddr.MustParseIPPort("9.9.9.9:23")},
dnsname.FQDN("d."): {netaddr.MustParseIPPort("8.8.8.8:13"), netaddr.MustParseIPPort("9.9.9.9:24")},
dnsname.FQDN("e."): {netaddr.MustParseIPPort("8.8.8.8:14"), netaddr.MustParseIPPort("9.9.9.9:25")},
},
map[tailcfg.DiscoKey]bool{
{1: 1}: true,
{1: 2}: false,
{2: 3}: true,
{3: 4}: false,
},
}
}
func BenchmarkHash(b *testing.B) {
b.ReportAllocs()
v := getVal()
for i := 0; i < b.N; i++ {
Hash(v)
}
}
func TestHashMapAcyclic(t *testing.T) {
m := map[int]string{}
for i := 0; i < 100; i++ {
m[i] = fmt.Sprint(i)
}
got := map[string]bool{}
var buf bytes.Buffer
bw := bufio.NewWriter(&buf)
for i := 0; i < 20; i++ {
visited := map[uintptr]bool{}
v := reflect.ValueOf(m)
buf.Reset()
bw.Reset(&buf)
if !hashMapAcyclic(bw, v, visited) {
t.Fatal("returned false")
}
if got[string(buf.Bytes())] {
continue
}
got[string(buf.Bytes())] = true
}
if len(got) != 1 {
t.Errorf("got %d results; want 1", len(got))
}
}
func BenchmarkHashMapAcyclic(b *testing.B) {
b.ReportAllocs()
m := map[int]string{}
for i := 0; i < 100; i++ {
m[i] = fmt.Sprint(i)
}
var buf bytes.Buffer
bw := bufio.NewWriter(&buf)
visited := map[uintptr]bool{}
v := reflect.ValueOf(m)
for i := 0; i < b.N; i++ {
buf.Reset()
bw.Reset(&buf)
if !hashMapAcyclic(bw, v, visited) {
b.Fatal("returned false")
}
}
}