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Merge pull request #95981 from caesarxuchao/http2-healthcheck
Enables HTTP/2 health check Kubernetes-commit: afeac926fa79179bfd0c5e718459086845a2a80c
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| /* | ||
| Copyright 2019 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package rest | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "net/url" | ||
| "os" | ||
| "strconv" | ||
| "sync/atomic" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "k8s.io/apimachinery/pkg/runtime/schema" | ||
| "k8s.io/apimachinery/pkg/runtime/serializer" | ||
| utilnet "k8s.io/apimachinery/pkg/util/net" | ||
| ) | ||
|
|
||
| type tcpLB struct { | ||
| t *testing.T | ||
| ln net.Listener | ||
| serverURL string | ||
| dials int32 | ||
| } | ||
|
|
||
| func (lb *tcpLB) handleConnection(in net.Conn, stopCh chan struct{}) { | ||
| out, err := net.Dial("tcp", lb.serverURL) | ||
| if err != nil { | ||
| lb.t.Log(err) | ||
| return | ||
| } | ||
| go io.Copy(out, in) | ||
| go io.Copy(in, out) | ||
| <-stopCh | ||
| if err := out.Close(); err != nil { | ||
| lb.t.Fatalf("failed to close connection: %v", err) | ||
| } | ||
| } | ||
|
|
||
| func (lb *tcpLB) serve(stopCh chan struct{}) { | ||
| conn, err := lb.ln.Accept() | ||
| if err != nil { | ||
| lb.t.Fatalf("failed to accept: %v", err) | ||
| } | ||
| atomic.AddInt32(&lb.dials, 1) | ||
| go lb.handleConnection(conn, stopCh) | ||
| } | ||
|
|
||
| func newLB(t *testing.T, serverURL string) *tcpLB { | ||
| ln, err := net.Listen("tcp", "127.0.0.1:0") | ||
| if err != nil { | ||
| t.Fatalf("failed to bind: %v", err) | ||
| } | ||
| lb := tcpLB{ | ||
| serverURL: serverURL, | ||
| ln: ln, | ||
| t: t, | ||
| } | ||
| return &lb | ||
| } | ||
|
|
||
| func setEnv(key, value string) func() { | ||
| originalValue := os.Getenv(key) | ||
| os.Setenv(key, value) | ||
| return func() { | ||
| os.Setenv(key, originalValue) | ||
| } | ||
| } | ||
|
|
||
| const ( | ||
| readIdleTimeout int = 1 | ||
| pingTimeout int = 1 | ||
| ) | ||
|
|
||
| func TestReconnectBrokenTCP(t *testing.T) { | ||
| defer setEnv("HTTP2_READ_IDLE_TIMEOUT_SECONDS", strconv.Itoa(readIdleTimeout))() | ||
| defer setEnv("HTTP2_PING_TIMEOUT_SECONDS", strconv.Itoa(pingTimeout))() | ||
| defer setEnv("DISABLE_HTTP2", "")() | ||
| ts := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| fmt.Fprintf(w, "Hello, %s", r.Proto) | ||
| })) | ||
| ts.EnableHTTP2 = true | ||
| ts.StartTLS() | ||
| defer ts.Close() | ||
|
|
||
| u, err := url.Parse(ts.URL) | ||
| if err != nil { | ||
| t.Fatalf("failed to parse URL from %q: %v", ts.URL, err) | ||
| } | ||
| lb := newLB(t, u.Host) | ||
| defer lb.ln.Close() | ||
| stopCh := make(chan struct{}) | ||
| go lb.serve(stopCh) | ||
| transport, ok := ts.Client().Transport.(*http.Transport) | ||
| if !ok { | ||
| t.Fatalf("failed to assert *http.Transport") | ||
| } | ||
| config := &Config{ | ||
| Host: "https://" + lb.ln.Addr().String(), | ||
| Transport: utilnet.SetTransportDefaults(transport), | ||
| Timeout: 1 * time.Second, | ||
| // These fields are required to create a REST client. | ||
| ContentConfig: ContentConfig{ | ||
| GroupVersion: &schema.GroupVersion{}, | ||
| NegotiatedSerializer: &serializer.CodecFactory{}, | ||
| }, | ||
| } | ||
| client, err := RESTClientFor(config) | ||
| if err != nil { | ||
| t.Fatalf("failed to create REST client: %v", err) | ||
| } | ||
| data, err := client.Get().AbsPath("/").DoRaw(context.TODO()) | ||
| if err != nil { | ||
| t.Fatalf("unexpected err: %s: %v", data, err) | ||
| } | ||
| if string(data) != "Hello, HTTP/2.0" { | ||
| t.Fatalf("unexpected response: %s", data) | ||
| } | ||
|
|
||
| // Deliberately let the LB stop proxying traffic for the current | ||
| // connection. This mimics a broken TCP connection that's not properly | ||
| // closed. | ||
| close(stopCh) | ||
|
|
||
| stopCh = make(chan struct{}) | ||
| go lb.serve(stopCh) | ||
| // Sleep enough time for the HTTP/2 health check to detect and close | ||
| // the broken TCP connection. | ||
| time.Sleep(time.Duration(1+readIdleTimeout+pingTimeout) * time.Second) | ||
| // If the HTTP/2 health check were disabled, the broken connection | ||
| // would still be in the connection pool, the following request would | ||
| // then reuse the broken connection instead of creating a new one, and | ||
| // thus would fail. | ||
| data, err = client.Get().AbsPath("/").DoRaw(context.TODO()) | ||
| if err != nil { | ||
| t.Fatalf("unexpected err: %v", err) | ||
| } | ||
| if string(data) != "Hello, HTTP/2.0" { | ||
| t.Fatalf("unexpected response: %s", data) | ||
| } | ||
| dials := atomic.LoadInt32(&lb.dials) | ||
| if dials != 2 { | ||
| t.Fatalf("expected %d dials, got %d", 2, dials) | ||
| } | ||
| } |