Align with go library layout

1 files changed, 255 insertions, 0 deletions

diff --git a/trie_test.go b/trie_test.go
new file mode 100644
index 0000000..9d53df3
--- /dev/null
+++ b/trie_test.go
@@ -0,0 +1,255 @@
+package main
+
+import (
+	"math/rand"
+	"net"
+	"testing"
+)
+
+/* Todo: More comprehensive
+ */
+
+type testPairCommonBits struct {
+	s1    []byte
+	s2    []byte
+	match uint
+}
+
+type testPairTrieInsert struct {
+	key  []byte
+	cidr uint
+	peer *Peer
+}
+
+type testPairTrieLookup struct {
+	key  []byte
+	peer *Peer
+}
+
+func printTrie(t *testing.T, p *Trie) {
+	if p == nil {
+		return
+	}
+	t.Log(p)
+	printTrie(t, p.child[0])
+	printTrie(t, p.child[1])
+}
+
+func TestCommonBits(t *testing.T) {
+
+	tests := []testPairCommonBits{
+		{s1: []byte{1, 4, 53, 128}, s2: []byte{0, 0, 0, 0}, match: 7},
+		{s1: []byte{0, 4, 53, 128}, s2: []byte{0, 0, 0, 0}, match: 13},
+		{s1: []byte{0, 4, 53, 253}, s2: []byte{0, 4, 53, 252}, match: 31},
+		{s1: []byte{192, 168, 1, 1}, s2: []byte{192, 169, 1, 1}, match: 15},
+		{s1: []byte{65, 168, 1, 1}, s2: []byte{192, 169, 1, 1}, match: 0},
+	}
+
+	for _, p := range tests {
+		v := commonBits(p.s1, p.s2)
+		if v != p.match {
+			t.Error(
+				"For slice", p.s1, p.s2,
+				"expected match", p.match,
+				",but got", v,
+			)
+		}
+	}
+}
+
+func benchmarkTrie(peerNumber int, addressNumber int, addressLength int, b *testing.B) {
+	var trie *Trie
+	var peers []*Peer
+
+	rand.Seed(1)
+
+	const AddressLength = 4
+
+	for n := 0; n < peerNumber; n += 1 {
+		peers = append(peers, &Peer{})
+	}
+
+	for n := 0; n < addressNumber; n += 1 {
+		var addr [AddressLength]byte
+		rand.Read(addr[:])
+		cidr := uint(rand.Uint32() % (AddressLength * 8))
+		index := rand.Int() % peerNumber
+		trie = trie.Insert(addr[:], cidr, peers[index])
+	}
+
+	for n := 0; n < b.N; n += 1 {
+		var addr [AddressLength]byte
+		rand.Read(addr[:])
+		trie.Lookup(addr[:])
+	}
+}
+
+func BenchmarkTrieIPv4Peers100Addresses1000(b *testing.B) {
+	benchmarkTrie(100, 1000, net.IPv4len, b)
+}
+
+func BenchmarkTrieIPv4Peers10Addresses10(b *testing.B) {
+	benchmarkTrie(10, 10, net.IPv4len, b)
+}
+
+func BenchmarkTrieIPv6Peers100Addresses1000(b *testing.B) {
+	benchmarkTrie(100, 1000, net.IPv6len, b)
+}
+
+func BenchmarkTrieIPv6Peers10Addresses10(b *testing.B) {
+	benchmarkTrie(10, 10, net.IPv6len, b)
+}
+
+/* Test ported from kernel implementation:
+ * selftest/routingtable.h
+ */
+func TestTrieIPv4(t *testing.T) {
+	a := &Peer{}
+	b := &Peer{}
+	c := &Peer{}
+	d := &Peer{}
+	e := &Peer{}
+	g := &Peer{}
+	h := &Peer{}
+
+	var trie *Trie
+
+	insert := func(peer *Peer, a, b, c, d byte, cidr uint) {
+		trie = trie.Insert([]byte{a, b, c, d}, cidr, peer)
+	}
+
+	assertEQ := func(peer *Peer, a, b, c, d byte) {
+		p := trie.Lookup([]byte{a, b, c, d})
+		if p != peer {
+			t.Error("Assert EQ failed")
+		}
+	}
+
+	assertNEQ := func(peer *Peer, a, b, c, d byte) {
+		p := trie.Lookup([]byte{a, b, c, d})
+		if p == peer {
+			t.Error("Assert NEQ failed")
+		}
+	}
+
+	insert(a, 192, 168, 4, 0, 24)
+	insert(b, 192, 168, 4, 4, 32)
+	insert(c, 192, 168, 0, 0, 16)
+	insert(d, 192, 95, 5, 64, 27)
+	insert(c, 192, 95, 5, 65, 27)
+	insert(e, 0, 0, 0, 0, 0)
+	insert(g, 64, 15, 112, 0, 20)
+	insert(h, 64, 15, 123, 211, 25)
+	insert(a, 10, 0, 0, 0, 25)
+	insert(b, 10, 0, 0, 128, 25)
+	insert(a, 10, 1, 0, 0, 30)
+	insert(b, 10, 1, 0, 4, 30)
+	insert(c, 10, 1, 0, 8, 29)
+	insert(d, 10, 1, 0, 16, 29)
+
+	assertEQ(a, 192, 168, 4, 20)
+	assertEQ(a, 192, 168, 4, 0)
+	assertEQ(b, 192, 168, 4, 4)
+	assertEQ(c, 192, 168, 200, 182)
+	assertEQ(c, 192, 95, 5, 68)
+	assertEQ(e, 192, 95, 5, 96)
+	assertEQ(g, 64, 15, 116, 26)
+	assertEQ(g, 64, 15, 127, 3)
+
+	insert(a, 1, 0, 0, 0, 32)
+	insert(a, 64, 0, 0, 0, 32)
+	insert(a, 128, 0, 0, 0, 32)
+	insert(a, 192, 0, 0, 0, 32)
+	insert(a, 255, 0, 0, 0, 32)
+
+	assertEQ(a, 1, 0, 0, 0)
+	assertEQ(a, 64, 0, 0, 0)
+	assertEQ(a, 128, 0, 0, 0)
+	assertEQ(a, 192, 0, 0, 0)
+	assertEQ(a, 255, 0, 0, 0)
+
+	trie = trie.RemovePeer(a)
+
+	assertNEQ(a, 1, 0, 0, 0)
+	assertNEQ(a, 64, 0, 0, 0)
+	assertNEQ(a, 128, 0, 0, 0)
+	assertNEQ(a, 192, 0, 0, 0)
+	assertNEQ(a, 255, 0, 0, 0)
+
+	trie = nil
+
+	insert(a, 192, 168, 0, 0, 16)
+	insert(a, 192, 168, 0, 0, 24)
+
+	trie = trie.RemovePeer(a)
+
+	assertNEQ(a, 192, 168, 0, 1)
+}
+
+/* Test ported from kernel implementation:
+ * selftest/routingtable.h
+ */
+func TestTrieIPv6(t *testing.T) {
+	a := &Peer{}
+	b := &Peer{}
+	c := &Peer{}
+	d := &Peer{}
+	e := &Peer{}
+	f := &Peer{}
+	g := &Peer{}
+	h := &Peer{}
+
+	var trie *Trie
+
+	expand := func(a uint32) []byte {
+		var out [4]byte
+		out[0] = byte(a >> 24 & 0xff)
+		out[1] = byte(a >> 16 & 0xff)
+		out[2] = byte(a >> 8 & 0xff)
+		out[3] = byte(a & 0xff)
+		return out[:]
+	}
+
+	insert := func(peer *Peer, a, b, c, d uint32, cidr uint) {
+		var addr []byte
+		addr = append(addr, expand(a)...)
+		addr = append(addr, expand(b)...)
+		addr = append(addr, expand(c)...)
+		addr = append(addr, expand(d)...)
+		trie = trie.Insert(addr, cidr, peer)
+	}
+
+	assertEQ := func(peer *Peer, a, b, c, d uint32) {
+		var addr []byte
+		addr = append(addr, expand(a)...)
+		addr = append(addr, expand(b)...)
+		addr = append(addr, expand(c)...)
+		addr = append(addr, expand(d)...)
+		p := trie.Lookup(addr)
+		if p != peer {
+			t.Error("Assert EQ failed")
+		}
+	}
+
+	insert(d, 0x26075300, 0x60006b00, 0, 0xc05f0543, 128)
+	insert(c, 0x26075300, 0x60006b00, 0, 0, 64)
+	insert(e, 0, 0, 0, 0, 0)
+	insert(f, 0, 0, 0, 0, 0)
+	insert(g, 0x24046800, 0, 0, 0, 32)
+	insert(h, 0x24046800, 0x40040800, 0xdeadbeef, 0xdeadbeef, 64)
+	insert(a, 0x24046800, 0x40040800, 0xdeadbeef, 0xdeadbeef, 128)
+	insert(c, 0x24446800, 0x40e40800, 0xdeaebeef, 0xdefbeef, 128)
+	insert(b, 0x24446800, 0xf0e40800, 0xeeaebeef, 0, 98)
+
+	assertEQ(d, 0x26075300, 0x60006b00, 0, 0xc05f0543)
+	assertEQ(c, 0x26075300, 0x60006b00, 0, 0xc02e01ee)
+	assertEQ(f, 0x26075300, 0x60006b01, 0, 0)
+	assertEQ(g, 0x24046800, 0x40040806, 0, 0x1006)
+	assertEQ(g, 0x24046800, 0x40040806, 0x1234, 0x5678)
+	assertEQ(f, 0x240467ff, 0x40040806, 0x1234, 0x5678)
+	assertEQ(f, 0x24046801, 0x40040806, 0x1234, 0x5678)
+	assertEQ(h, 0x24046800, 0x40040800, 0x1234, 0x5678)
+	assertEQ(h, 0x24046800, 0x40040800, 0, 0)
+	assertEQ(h, 0x24046800, 0x40040800, 0x10101010, 0x10101010)
+	assertEQ(a, 0x24046800, 0x40040800, 0xdeadbeef, 0xdeadbeef)
+}