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moby--moby/libnetwork/etchosts/etchosts_test.go

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package etchosts
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"sync"
"testing"
_ "github.com/docker/libnetwork/testutils"
)
func TestBuildDefault(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
// check that /etc/hosts has consistent ordering
for i := 0; i <= 5; i++ {
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
expected := "127.0.0.1\tlocalhost\n::1\tlocalhost ip6-localhost ip6-loopback\nfe00::0\tip6-localnet\nff00::0\tip6-mcastprefix\nff02::1\tip6-allnodes\nff02::2\tip6-allrouters\n"
if expected != string(content) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
}
func TestBuildHostnameDomainname(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "10.11.12.13", "testhostname", "testdomainname", nil)
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "10.11.12.13\ttesthostname.testdomainname testhostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestBuildHostname(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "10.11.12.13", "testhostname", "", nil)
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "10.11.12.13\ttesthostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestBuildHostnameFQDN(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "10.11.12.13", "testhostname.testdomainname.com", "", nil)
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "10.11.12.13\ttesthostname.testdomainname.com testhostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestBuildNoIP(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "testhostname", "", nil)
if err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := ""; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestUpdate(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
if err := Build(file.Name(), "10.11.12.13", "testhostname", "testdomainname", nil); err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "10.11.12.13\ttesthostname.testdomainname testhostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
if err := Update(file.Name(), "1.1.1.1", "testhostname"); err != nil {
t.Fatal(err)
}
content, err = ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "1.1.1.1\ttesthostname.testdomainname testhostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
// This regression test ensures that when a host is given a new IP
// via the Update function that other hosts which start with the
// same name as the targeted host are not erroneously updated as well.
// In the test example, if updating a host called "prefix", unrelated
// hosts named "prefixAndMore" or "prefix2" or anything else starting
// with "prefix" should not be changed. For more information see
// GitHub issue #603.
func TestUpdateIgnoresPrefixedHostname(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
if err := Build(file.Name(), "10.11.12.13", "testhostname", "testdomainname", []Record{
{
Hosts: "prefix",
IP: "2.2.2.2",
},
{
Hosts: "prefixAndMore",
IP: "3.3.3.3",
},
{
Hosts: "unaffectedHost",
IP: "4.4.4.4",
},
}); err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "2.2.2.2\tprefix\n3.3.3.3\tprefixAndMore\n4.4.4.4\tunaffectedHost\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
if err := Update(file.Name(), "5.5.5.5", "prefix"); err != nil {
t.Fatal(err)
}
content, err = ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "5.5.5.5\tprefix\n3.3.3.3\tprefixAndMore\n4.4.4.4\tunaffectedHost\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
// This regression test covers the host prefix issue for the
// Delete function. In the test example, if deleting a host called
// "prefix", an unrelated host called "prefixAndMore" should not
// be deleted. For more information see GitHub issue #603.
func TestDeleteIgnoresPrefixedHostname(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
if err := Add(file.Name(), []Record{
{
Hosts: "prefix",
IP: "1.1.1.1",
},
{
Hosts: "prefixAndMore",
IP: "2.2.2.2",
},
}); err != nil {
t.Fatal(err)
}
if err := Delete(file.Name(), []Record{
{
Hosts: "prefix",
IP: "1.1.1.1",
},
}); err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "2.2.2.2\tprefixAndMore\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
if expected := "1.1.1.1\tprefix\n"; bytes.Contains(content, []byte(expected)) {
t.Fatalf("Did not expect to find '%s' got '%s'", expected, content)
}
}
func TestAddEmpty(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
if err := Add(file.Name(), []Record{}); err != nil {
t.Fatal(err)
}
}
func TestAdd(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
if err := Add(file.Name(), []Record{
{
Hosts: "testhostname",
IP: "2.2.2.2",
},
}); err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "2.2.2.2\ttesthostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func TestDeleteEmpty(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
if err := Delete(file.Name(), []Record{}); err != nil {
t.Fatal(err)
}
}
func TestDeleteNewline(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
b := []byte("\n")
if _, err := file.Write(b); err != nil {
t.Fatal(err)
}
rec := []Record{
{
Hosts: "prefix",
IP: "2.2.2.2",
},
}
if err := Delete(file.Name(), rec); err != nil {
t.Fatal(err)
}
}
func TestDelete(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
if err := Add(file.Name(), []Record{
{
Hosts: "testhostname1",
IP: "1.1.1.1",
},
{
Hosts: "testhostname2",
IP: "2.2.2.2",
},
{
Hosts: "testhostname3",
IP: "3.3.3.3",
},
}); err != nil {
t.Fatal(err)
}
if err := Delete(file.Name(), []Record{
{
Hosts: "testhostname1",
IP: "1.1.1.1",
},
{
Hosts: "testhostname3",
IP: "3.3.3.3",
},
}); err != nil {
t.Fatal(err)
}
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "2.2.2.2\ttesthostname2\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
if expected := "1.1.1.1\ttesthostname1\n"; bytes.Contains(content, []byte(expected)) {
t.Fatalf("Did not expect to find '%s' got '%s'", expected, content)
}
}
func TestConcurrentWrites(t *testing.T) {
file, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
err = Build(file.Name(), "", "", "", nil)
if err != nil {
t.Fatal(err)
}
if err := Add(file.Name(), []Record{
{
Hosts: "inithostname",
IP: "172.17.0.1",
},
}); err != nil {
t.Fatal(err)
}
var wg sync.WaitGroup
for i := 0; i < 10; i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
rec := []Record{
{
IP: fmt.Sprintf("%d.%d.%d.%d", i, i, i, i),
Hosts: fmt.Sprintf("testhostname%d", i),
},
}
for j := 0; j < 25; j++ {
if err := Add(file.Name(), rec); err != nil {
t.Fatal(err)
}
if err := Delete(file.Name(), rec); err != nil {
t.Fatal(err)
}
}
}(i)
}
wg.Wait()
content, err := ioutil.ReadFile(file.Name())
if err != nil {
t.Fatal(err)
}
if expected := "172.17.0.1\tinithostname\n"; !bytes.Contains(content, []byte(expected)) {
t.Fatalf("Expected to find '%s' got '%s'", expected, content)
}
}
func benchDelete(b *testing.B) {
b.StopTimer()
file, err := ioutil.TempFile("", "")
if err != nil {
b.Fatal(err)
}
defer func() {
b.StopTimer()
file.Close()
os.Remove(file.Name())
b.StartTimer()
}()
err = Build(file.Name(), "", "", "", nil)
if err != nil {
b.Fatal(err)
}
var records []Record
var toDelete []Record
for i := 0; i < 255; i++ {
record := Record{
Hosts: fmt.Sprintf("testhostname%d", i),
IP: fmt.Sprintf("%d.%d.%d.%d", i, i, i, i),
}
records = append(records, record)
if i%2 == 0 {
toDelete = append(records, record)
}
}
if err := Add(file.Name(), records); err != nil {
b.Fatal(err)
}
b.StartTimer()
if err := Delete(file.Name(), toDelete); err != nil {
b.Fatal(err)
}
}
func BenchmarkDelete(b *testing.B) {
for i := 0; i < b.N; i++ {
benchDelete(b)
}
}