208 lines
5 KiB
Go
208 lines
5 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package http
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import (
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"context"
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"errors"
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"fmt"
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"math/rand"
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"net"
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"testing"
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"time"
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)
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var (
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testFreq = 1 * time.Second
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testDefaultLookupTimeout = 1 * time.Second
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)
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func logOnce(ctx context.Context, err error, id interface{}, errKind ...interface{}) {
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// no-op
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}
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func testDNSCache(t *testing.T) *DNSCache {
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t.Helper() // skip printing file and line information from this function
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return NewDNSCache(testFreq, testDefaultLookupTimeout, logOnce)
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}
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func TestDialContextWithDNSCache(t *testing.T) {
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resolver := &DNSCache{
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cache: map[string][]string{
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"play.min.io": {
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"127.0.0.1",
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"127.0.0.2",
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"127.0.0.3",
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},
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},
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}
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cases := []struct {
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permF func(n int) []int
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dialF DialContext
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}{
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{
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permF: func(n int) []int {
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return []int{0}
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},
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dialF: func(ctx context.Context, network, addr string) (net.Conn, error) {
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if got, want := addr, net.JoinHostPort("127.0.0.1", "443"); got != want {
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t.Fatalf("got addr %q, want %q", got, want)
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}
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return nil, nil
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},
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},
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{
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permF: func(n int) []int {
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return []int{1}
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},
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dialF: func(ctx context.Context, network, addr string) (net.Conn, error) {
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if got, want := addr, net.JoinHostPort("127.0.0.2", "443"); got != want {
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t.Fatalf("got addr %q, want %q", got, want)
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}
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return nil, nil
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},
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},
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{
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permF: func(n int) []int {
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return []int{2}
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},
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dialF: func(ctx context.Context, network, addr string) (net.Conn, error) {
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if got, want := addr, net.JoinHostPort("127.0.0.3", "443"); got != want {
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t.Fatalf("got addr %q, want %q", got, want)
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}
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return nil, nil
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},
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},
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}
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origFunc := randPerm
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defer func() {
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randPerm = origFunc
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}()
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for _, tc := range cases {
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t.Run("", func(t *testing.T) {
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randPerm = tc.permF
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if _, err := DialContextWithDNSCache(resolver, tc.dialF)(context.Background(), "tcp", "play.min.io:443"); err != nil {
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t.Fatalf("err: %s", err)
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}
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})
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}
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}
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func TestDialContextWithDNSCacheRand(t *testing.T) {
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rand.Seed(time.Now().UTC().UnixNano())
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defer func() {
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rand.Seed(1)
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}()
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resolver := &DNSCache{
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cache: map[string][]string{
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"play.min.io": {
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"127.0.0.1",
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"127.0.0.2",
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"127.0.0.3",
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},
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},
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}
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count := make(map[string]int)
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dialF := func(ctx context.Context, network, addr string) (net.Conn, error) {
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count[addr]++
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return nil, nil
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}
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for i := 0; i < 100; i++ {
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if _, err := DialContextWithDNSCache(resolver, dialF)(context.Background(), "tcp", "play.min.io:443"); err != nil {
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t.Fatalf("err: %s", err)
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}
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}
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for _, c := range count {
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got := float32(c) / float32(100)
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if got < float32(0.1) {
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t.Fatalf("expected 0.1 rate got %f", got)
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}
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}
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}
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// Verify without port Dial fails, Go stdlib net.Dial expects port
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func TestDialContextWithDNSCacheScenario1(t *testing.T) {
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resolver := testDNSCache(t)
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if _, err := DialContextWithDNSCache(resolver, nil)(context.Background(), "tcp", "play.min.io"); err == nil {
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t.Fatalf("expect to fail") // expected port
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}
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}
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// Verify if the host lookup function failed to return addresses
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func TestDialContextWithDNSCacheScenario2(t *testing.T) {
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res := testDNSCache(t)
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originalFunc := res.lookupHostFn
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defer func() {
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res.lookupHostFn = originalFunc
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}()
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res.lookupHostFn = func(ctx context.Context, host string) ([]string, error) {
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return nil, fmt.Errorf("err")
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}
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if _, err := DialContextWithDNSCache(res, nil)(context.Background(), "tcp", "min.io:443"); err == nil {
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t.Fatalf("exect to fail")
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}
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}
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// Verify we always return the first error from net.Dial failure
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func TestDialContextWithDNSCacheScenario3(t *testing.T) {
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resolver := &DNSCache{
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cache: map[string][]string{
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"min.io": {
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"1.1.1.1",
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"2.2.2.2",
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"3.3.3.3",
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},
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},
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}
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origFunc := randPerm
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randPerm = func(n int) []int {
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return []int{0, 1, 2}
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}
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defer func() {
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randPerm = origFunc
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}()
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want := errors.New("error1")
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dialF := func(ctx context.Context, network, addr string) (net.Conn, error) {
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if addr == net.JoinHostPort("1.1.1.1", "443") {
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return nil, want // first error should be returned
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}
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if addr == net.JoinHostPort("2.2.2.2", "443") {
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return nil, fmt.Errorf("error2")
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}
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if addr == net.JoinHostPort("3.3.3.3", "443") {
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return nil, fmt.Errorf("error3")
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}
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return nil, nil
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}
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_, got := DialContextWithDNSCache(resolver, dialF)(context.Background(), "tcp", "min.io:443")
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if got != want {
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t.Fatalf("got error %v, want %v", got, want)
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}
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}
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