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table_test.go
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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//
// some regression tests modified from github.com/tailscale/art
// for this implementation by:
//
// Copyright (c) 2024 Karl Gaissmaier
// SPDX-License-Identifier: MIT
package bart
import (
"fmt"
"math/rand"
"net/netip"
"reflect"
"runtime"
"testing"
)
var mpa = netip.MustParseAddr
var mpp = func(s string) netip.Prefix {
pfx := netip.MustParsePrefix(s)
if pfx == pfx.Masked() {
return pfx
}
panic(fmt.Sprintf("%s is not canonicalized as %s", s, pfx.Masked()))
}
// tests for deep copies with Cloner interface
type MyInt int
// implement the Cloner interface
func (i *MyInt) Clone() *MyInt {
a := *i
return &a
}
// ############ tests ################################
func TestInvalid(t *testing.T) {
t.Parallel()
tbl := new(Table[any])
var zeroPfx netip.Prefix
var zeroIP netip.Addr
var testname string
testname = "Insert"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.Insert(zeroPfx, nil)
})
testname = "Delete"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.Delete(zeroPfx)
})
testname = "Update"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.Update(zeroPfx, func(v any, _ bool) any { return v })
})
testname = "Get"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.Get(zeroPfx)
})
testname = "LookupPrefix"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.LookupPrefix(zeroPfx)
})
testname = "LookupPrefixLPM"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.LookupPrefixLPM(zeroPfx)
})
testname = "OverlapsPrefix"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid prefix input", testname)
}
}(testname)
tbl.OverlapsPrefix(zeroPfx)
})
testname = "Contains"
t.Run(testname, func(t *testing.T) {
t.Parallel()
defer func(testname string) {
if r := recover(); r != nil {
t.Fatalf("%s panics on invalid ip input", testname)
}
}(testname)
tbl.Contains(zeroIP)
})
}
func TestInsert(t *testing.T) {
t.Parallel()
tbl := new(Table[int])
// Create a new leaf strideTable, with compressed path
tbl.Insert(mpp("192.168.0.1/32"), 1)
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", -1},
{"192.168.0.3", -1},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", -1},
{"10.0.0.15", -1},
})
// explode path compressed
tbl.Insert(mpp("192.168.0.2/32"), 2)
checkNumNodes(t, tbl, 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", -1},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", -1},
{"10.0.0.15", -1},
})
// Insert into existing leaf
tbl.Insert(mpp("192.168.0.0/26"), 7)
checkNumNodes(t, tbl, 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", -1},
{"10.0.0.15", -1},
})
// Create a different leaf at root
tbl.Insert(mpp("10.0.0.0/27"), 3)
checkNumNodes(t, tbl, 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert that creates a new path compressed leaf
tbl.Insert(mpp("192.168.1.1/32"), 4)
checkNumNodes(t, tbl, 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert that creates a new path compressed leaf
tbl.Insert(mpp("192.170.0.0/16"), 5)
checkNumNodes(t, tbl, 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// New leaf in a different subtree, so the next insert can test a
// variant of decompression.
tbl.Insert(mpp("192.180.0.1/32"), 8)
checkNumNodes(t, tbl, 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", 8},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert that explodes the previous path compression
tbl.Insert(mpp("192.180.0.0/21"), 9)
checkNumNodes(t, tbl, 5)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", 8},
{"192.180.3.5", 9},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert a default route, those have their own codepath.
tbl.Insert(mpp("0.0.0.0/0"), 6)
checkNumNodes(t, tbl, 5)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", 6},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", 8},
{"192.180.3.5", 9},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Now all of the above again, but for IPv6.
// Create a new path compressed leaf
tbl.Insert(mpp("ff:aaaa::1/128"), 1)
checkNumNodes(t, tbl, 6)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", -1},
{"ff:aaaa::3", -1},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", -1},
{"ffff:bbbb::15", -1},
})
// Insert into previous leaf, explode v6 path compression
tbl.Insert(mpp("ff:aaaa::2/128"), 2)
checkNumNodes(t, tbl, 21)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", -1},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", -1},
{"ffff:bbbb::15", -1},
})
// Insert into previous node
tbl.Insert(mpp("ff:aaaa::/125"), 7)
checkNumNodes(t, tbl, 21)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", -1},
{"ffff:bbbb::15", -1},
})
// Create a different leaf elsewhere
tbl.Insert(mpp("ffff:bbbb::/120"), 3)
checkNumNodes(t, tbl, 21)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert that creates a new path compressed leaf
tbl.Insert(mpp("ff:aaaa:aaaa::1/128"), 4)
checkNumNodes(t, tbl, 21)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert that creates a new path in tree
tbl.Insert(mpp("ff:aaaa:aaaa:bb00::/56"), 5)
checkNumNodes(t, tbl, 23)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// New leaf in a different subtree, so the next insert can test a
// variant of decompression.
tbl.Insert(mpp("ff:cccc::1/128"), 8)
checkNumNodes(t, tbl, 23)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", 8},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert that explodes a previous path compressed leaf
tbl.Insert(mpp("ff:cccc::/37"), 9)
checkNumNodes(t, tbl, 25)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", 8},
{"ff:cccc::ff", 9},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert a default route, those have their own codepath.
tbl.Insert(mpp("::/0"), 6)
checkNumNodes(t, tbl, 25)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", 6},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", 8},
{"ff:cccc::ff", 9},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
}
func TestDelete(t *testing.T) {
t.Parallel()
t.Run("table_is_empty", func(t *testing.T) {
t.Parallel()
// must not panic
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Delete(randomPrefix())
checkNumNodes(t, tbl, 0)
})
t.Run("prefix_in_root", func(t *testing.T) {
t.Parallel()
// Add/remove prefix from root table.
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("10.0.0.0/8"), 1)
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"10.0.0.1", 1},
{"255.255.255.255", -1},
})
tbl.Delete(mpp("10.0.0.0/8"))
checkNumNodes(t, tbl, 0)
checkRoutes(t, tbl, []tableTest{
{"10.0.0.1", -1},
{"255.255.255.255", -1},
})
})
t.Run("prefix_in_leaf", func(t *testing.T) {
t.Parallel()
// Create, then delete a single leaf table.
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("192.168.0.1/32"), 1)
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"255.255.255.255", -1},
})
tbl.Delete(mpp("192.168.0.1/32"))
checkNumNodes(t, tbl, 0)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", -1},
{"255.255.255.255", -1},
})
})
t.Run("intermediate_no_routes", func(t *testing.T) {
t.Parallel()
// Create an intermediate with 2 leaves, then delete one leaf.
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("192.168.0.1/32"), 1)
tbl.Insert(mpp("192.180.0.1/32"), 2)
checkNumNodes(t, tbl, 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", 2},
{"192.40.0.1", -1},
})
tbl.Delete(mpp("192.180.0.1/32"))
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", -1},
{"192.40.0.1", -1},
})
})
t.Run("intermediate_with_route", func(t *testing.T) {
t.Parallel()
// Same, but the intermediate carries a route as well.
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("192.168.0.1/32"), 1)
tbl.Insert(mpp("192.180.0.1/32"), 2)
tbl.Insert(mpp("192.0.0.0/10"), 3)
checkNumNodes(t, tbl, 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", 2},
{"192.40.0.1", 3},
{"192.255.0.1", -1},
})
tbl.Delete(mpp("192.180.0.1/32"))
checkNumNodes(t, tbl, 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", -1},
{"192.40.0.1", 3},
{"192.255.0.1", -1},
})
})
t.Run("intermediate_many_leaves", func(t *testing.T) {
t.Parallel()
// Intermediate with 3 leaves, then delete one leaf.
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("192.168.0.1/32"), 1)
tbl.Insert(mpp("192.180.0.1/32"), 2)
tbl.Insert(mpp("192.200.0.1/32"), 3)
checkNumNodes(t, tbl, 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", 2},
{"192.200.0.1", 3},
{"192.255.0.1", -1},
})
tbl.Delete(mpp("192.180.0.1/32"))
checkNumNodes(t, tbl, 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", -1},
{"192.200.0.1", 3},
{"192.255.0.1", -1},
})
})
t.Run("nosuchprefix_missing_child", func(t *testing.T) {
t.Parallel()
// Delete non-existent prefix
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("192.168.0.1/32"), 1)
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
tbl.Delete(mpp("200.0.0.0/32"))
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
})
t.Run("intermediate_with_deleted_route", func(t *testing.T) {
t.Parallel()
// Intermediate node loses its last route and becomes
// compactable.
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("192.168.0.1/32"), 1)
tbl.Insert(mpp("192.168.0.0/22"), 2)
checkNumNodes(t, tbl, 3)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.255.0.1", -1},
})
tbl.Delete(mpp("192.168.0.0/22"))
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", -1},
{"192.255.0.1", -1},
})
})
t.Run("default_route", func(t *testing.T) {
t.Parallel()
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("0.0.0.0/0"), 1)
tbl.Insert(mpp("::/0"), 1)
tbl.Delete(mpp("0.0.0.0/0"))
checkNumNodes(t, tbl, 1)
checkRoutes(t, tbl, []tableTest{
{"1.2.3.4", -1},
{"::1", 1},
})
})
t.Run("path compressed purge", func(t *testing.T) {
t.Parallel()
tbl := new(Table[int])
checkNumNodes(t, tbl, 0)
tbl.Insert(mpp("10.10.0.0/17"), 1)
tbl.Insert(mpp("10.20.0.0/17"), 2)
checkNumNodes(t, tbl, 2)
tbl.Delete(mpp("10.20.0.0/17"))
checkNumNodes(t, tbl, 1)
tbl.Delete(mpp("10.10.0.0/17"))
checkNumNodes(t, tbl, 0)
})
}
func TestContainsCompare(t *testing.T) {
// Create large route tables repeatedly, and compare Table's
// behavior to a naive and slow but correct implementation.
t.Parallel()
pfxs := randomPrefixes(10_000)
gold := new(goldTable[int]).insertMany(pfxs)
fast := new(Table[int])
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
for range 10_000 {
a := randomAddr()
_, goldOK := gold.lookup(a)
fastOK := fast.Contains(a)
if goldOK != fastOK {
t.Fatalf("Contains(%q) = %v, want %v", a, fastOK, goldOK)
}
}
}
func TestLookupCompare(t *testing.T) {
// Create large route tables repeatedly, and compare Table's
// behavior to a naive and slow but correct implementation.
t.Parallel()
pfxs := randomPrefixes(10_000)
fast := new(Table[int])
gold := new(goldTable[int]).insertMany(pfxs)
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
seenVals4 := map[int]bool{}
seenVals6 := map[int]bool{}
for range 10_000 {
a := randomAddr()
goldVal, goldOK := gold.lookup(a)
fastVal, fastOK := fast.Lookup(a)
if !getsEqual(goldVal, goldOK, fastVal, fastOK) {
t.Fatalf("Lookup(%q) = (%v, %v), want (%v, %v)", a, fastVal, fastOK, goldVal, goldOK)
}
if a.Is6() {
seenVals6[fastVal] = true
} else {
seenVals4[fastVal] = true
}
}
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
// check that we didn't just return a single route for everything should be
// very generous indeed.
if cnt := len(seenVals4); cnt < 10 {
t.Fatalf("saw %d distinct v4 route results, statistically expected ~1000", cnt)
}
if cnt := len(seenVals6); cnt < 10 {
t.Fatalf("saw %d distinct v6 route results, statistically expected ~300", cnt)
}
}
func TestLookupPrefixUnmasked(t *testing.T) {
// test that the pfx must not be masked on input for LookupPrefix
t.Parallel()
rt := new(Table[any])
rt.Insert(mpp("10.20.30.0/24"), nil)
// not normalized pfxs
tests := []struct {
probe netip.Prefix
wantLPM netip.Prefix
wantOk bool
}{
{
probe: netip.MustParsePrefix("10.20.30.40/0"),
wantLPM: netip.Prefix{},
wantOk: false,
},
{
probe: netip.MustParsePrefix("10.20.30.40/23"),
wantLPM: netip.Prefix{},
wantOk: false,
},
{
probe: netip.MustParsePrefix("10.20.30.40/24"),
wantLPM: mpp("10.20.30.0/24"),
wantOk: true,
},
{
probe: netip.MustParsePrefix("10.20.30.40/25"),
wantLPM: mpp("10.20.30.0/24"),
wantOk: true,
},
{
probe: netip.MustParsePrefix("10.20.30.40/32"),
wantLPM: mpp("10.20.30.0/24"),
wantOk: true,
},
}
for _, tc := range tests {
_, got := rt.LookupPrefix(tc.probe)
if got != tc.wantOk {
t.Errorf("LookupPrefix non canonical prefix (%s), got: %v, want: %v", tc.probe, got, tc.wantOk)
}
lpm, _, got := rt.LookupPrefixLPM(tc.probe)
if got != tc.wantOk {
t.Errorf("LookupPrefixLPM non canonical prefix (%s), got: %v, want: %v", tc.probe, got, tc.wantOk)
}
if lpm != tc.wantLPM {
t.Errorf("LookupPrefixLPM non canonical prefix (%s), got: %v, want: %v", tc.probe, lpm, tc.wantLPM)
}
}
}
func TestLookupPrefixCompare(t *testing.T) {
// Create large route tables repeatedly, and compare Table's
// behavior to a naive and slow but correct implementation.
t.Parallel()
pfxs := randomPrefixes(10_000)
fast := new(Table[int])
gold := new(goldTable[int]).insertMany(pfxs)
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
seenVals4 := map[int]bool{}
seenVals6 := map[int]bool{}
for range 10_000 {
pfx := randomPrefix()
goldVal, goldOK := gold.lookupPfx(pfx)
fastVal, fastOK := fast.LookupPrefix(pfx)
if !getsEqual(goldVal, goldOK, fastVal, fastOK) {
t.Fatalf("LookupPrefix(%q) = (%v, %v), want (%v, %v)", pfx, fastVal, fastOK, goldVal, goldOK)
}
if pfx.Addr().Is6() {
seenVals6[fastVal] = true
} else {
seenVals4[fastVal] = true
}
}
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
// check that we didn't just return a single route for everything should be
// very generous indeed.
if cnt := len(seenVals4); cnt < 10 {
t.Fatalf("saw %d distinct v4 route results, statistically expected ~1000", cnt)
}
if cnt := len(seenVals6); cnt < 10 {
t.Fatalf("saw %d distinct v6 route results, statistically expected ~300", cnt)
}
}
func TestLookupPrefixLPMCompare(t *testing.T) {
// Create large route tables repeatedly, and compare Table's
// behavior to a naive and slow but correct implementation.
t.Parallel()
pfxs := randomPrefixes(10_000)
fast := new(Table[int])
gold := new(goldTable[int]).insertMany(pfxs)
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
seenVals4 := map[int]bool{}
seenVals6 := map[int]bool{}
for range 10_000 {
pfx := randomPrefix()
goldLPM, goldVal, goldOK := gold.lookupPfxLPM(pfx)
fastLPM, fastVal, fastOK := fast.LookupPrefixLPM(pfx)
if !getsEqual(goldVal, goldOK, fastVal, fastOK) {
t.Fatalf("LookupPrefixLPM(%q) = (%v, %v), want (%v, %v)", pfx, fastVal, fastOK, goldVal, goldOK)
}
if !getsEqual(goldLPM, goldOK, fastLPM, fastOK) {
t.Fatalf("LookupPrefixLPM(%q) = (%v, %v), want (%v, %v)", pfx, fastLPM, fastOK, goldLPM, goldOK)
}
if pfx.Addr().Is6() {
seenVals6[fastVal] = true
} else {
seenVals4[fastVal] = true
}
}
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
// check that we didn't just return a single route for everything should be
// very generous indeed.
if cnt := len(seenVals4); cnt < 10 {
t.Fatalf("saw %d distinct v4 route results, statistically expected ~1000", cnt)
}
if cnt := len(seenVals6); cnt < 10 {
t.Fatalf("saw %d distinct v6 route results, statistically expected ~300", cnt)
}
}
func TestInsertShuffled(t *testing.T) {
// The order in which you insert prefixes into a route table
// should not matter, as long as you're inserting the same set of
// routes.
t.Parallel()
pfxs := randomPrefixes(1000)
for range 10 {
pfxs2 := append([]goldTableItem[int](nil), pfxs...)
rand.Shuffle(len(pfxs2), func(i, j int) { pfxs2[i], pfxs2[j] = pfxs2[j], pfxs2[i] })
addrs := make([]netip.Addr, 0, 10_000)
for range 10_000 {
addrs = append(addrs, randomAddr())
}
rt1 := new(Table[int])
rt2 := new(Table[int])
for _, pfx := range pfxs {
rt1.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range pfxs2 {
rt2.Insert(pfx.pfx, pfx.val)
}
for _, a := range addrs {
val1, ok1 := rt1.Lookup(a)
val2, ok2 := rt2.Lookup(a)
if !getsEqual(val1, ok1, val2, ok2) {
t.Fatalf("Lookup(%q) = (%v, %v), want (%v, %v)", a, val2, ok2, val1, ok1)
}
}
}
}
func TestDeleteCompare(t *testing.T) {
// Create large route tables repeatedly, delete half of their
// prefixes, and compare Table's behavior to a naive and slow but
// correct implementation.
t.Parallel()
const (
numPrefixes = 10_000 // total prefixes to insert (test deletes 50% of them)
numPerFamily = numPrefixes / 2
deleteCut = numPerFamily / 2
numProbes = 10_000 // random addr lookups to do
)
// We have to do this little dance instead of just using allPrefixes,
// because we want pfxs and toDelete to be non-overlapping sets.
all4, all6 := randomPrefixes4(numPerFamily), randomPrefixes6(numPerFamily)
pfxs := append([]goldTableItem[int](nil), all4[:deleteCut]...)
pfxs = append(pfxs, all6[:deleteCut]...)
toDelete := append([]goldTableItem[int](nil), all4[deleteCut:]...)
toDelete = append(toDelete, all6[deleteCut:]...)
fast := new(Table[int])
gold := new(goldTable[int]).insertMany(pfxs)
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete {
fast.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete {
fast.Delete(pfx.pfx)
}
seenVals4 := map[int]bool{}
seenVals6 := map[int]bool{}
for range numProbes {
a := randomAddr()
goldVal, goldOK := gold.lookup(a)
fastVal, fastOK := fast.Lookup(a)
if !getsEqual(goldVal, goldOK, fastVal, fastOK) {
t.Fatalf("Lookup(%q) = (%v, %v), want (%v, %v)", a, fastVal, fastOK, goldVal, goldOK)
}
if a.Is6() {
seenVals6[fastVal] = true
} else {
seenVals4[fastVal] = true
}
}
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
// check that we didn't just return a single route for everything should be
// very generous indeed.
if cnt := len(seenVals4); cnt < 10 {
t.Fatalf("saw %d distinct v4 route results, statistically expected ~1000", cnt)
}
if cnt := len(seenVals6); cnt < 10 {
t.Fatalf("saw %d distinct v6 route results, statistically expected ~300", cnt)
}
}
func TestDeleteShuffled(t *testing.T) {
// The order in which you delete prefixes from a route table
// should not matter, as long as you're deleting the same set of
// routes.
t.Parallel()
const (
numPrefixes = 10_000 // prefixes to insert (test deletes 50% of them)
numPerFamily = numPrefixes / 2
deleteCut = numPerFamily / 2
numProbes = 10_000 // random addr lookups to do
)
// We have to do this little dance instead of just using allPrefixes,
// because we want pfxs and toDelete to be non-overlapping sets.
all4, all6 := randomPrefixes4(numPerFamily), randomPrefixes6(numPerFamily)
pfxs := append([]goldTableItem[int](nil), all4[:deleteCut]...)