| // Copyright 2016 Google LLC |
| // |
| // 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 metadata |
| |
| import ( |
| "bytes" |
| "context" |
| "io" |
| "log" |
| "net/http" |
| "os" |
| "strings" |
| "sync" |
| "testing" |
| "time" |
| ) |
| |
| func TestOnGCE_Stress(t *testing.T) { |
| if testing.Short() { |
| t.Skip("skipping in -short mode") |
| } |
| var last bool |
| for i := 0; i < 100; i++ { |
| onGCEOnce = sync.Once{} |
| |
| now := OnGCE() |
| if i > 0 && now != last { |
| t.Errorf("%d. changed from %v to %v", i, last, now) |
| } |
| last = now |
| } |
| t.Logf("OnGCE() = %v", last) |
| } |
| |
| func TestOnGCE_Force(t *testing.T) { |
| onGCEOnce = sync.Once{} |
| old := os.Getenv(metadataHostEnv) |
| defer os.Setenv(metadataHostEnv, old) |
| os.Setenv(metadataHostEnv, "127.0.0.1") |
| if !OnGCE() { |
| t.Error("OnGCE() = false; want true") |
| } |
| } |
| |
| func TestOverrideUserAgent(t *testing.T) { |
| ctx := context.Background() |
| const userAgent = "my-user-agent" |
| rt := &rrt{} |
| c := NewClient(&http.Client{Transport: userAgentTransport{userAgent, rt}}) |
| c.GetWithContext(ctx, "foo") |
| if got, want := rt.gotUserAgent, userAgent; got != want { |
| t.Errorf("got %q, want %q", got, want) |
| } |
| } |
| |
| func TestGetFailsOnBadURL(t *testing.T) { |
| ctx := context.Background() |
| c := NewClient(http.DefaultClient) |
| old := os.Getenv(metadataHostEnv) |
| defer os.Setenv(metadataHostEnv, old) |
| os.Setenv(metadataHostEnv, "host:-1") |
| _, err := c.GetWithContext(ctx, "suffix") |
| log.Printf("%v", err) |
| if err == nil { |
| t.Errorf("got %v, want non-nil error", err) |
| } |
| } |
| |
| func TestGet_LeadingSlash(t *testing.T) { |
| want := "http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/identity?audience=http://example.com" |
| tests := []struct { |
| name string |
| suffix string |
| }{ |
| { |
| name: "without leading slash", |
| suffix: "instance/service-accounts/default/identity?audience=http://example.com", |
| }, |
| { |
| name: "with leading slash", |
| suffix: "/instance/service-accounts/default/identity?audience=http://example.com", |
| }, |
| } |
| for _, tc := range tests { |
| t.Run(tc.name, func(t *testing.T) { |
| ctx := context.Background() |
| ct := &captureTransport{} |
| c := NewClient(&http.Client{Transport: ct}) |
| c.GetWithContext(ctx, tc.suffix) |
| if ct.url != want { |
| t.Fatalf("got %v, want %v", ct.url, want) |
| } |
| }) |
| } |
| } |
| |
| type captureTransport struct { |
| url string |
| } |
| |
| func (ct *captureTransport) RoundTrip(req *http.Request) (*http.Response, error) { |
| ct.url = req.URL.String() |
| return &http.Response{Body: io.NopCloser(io.Reader(bytes.NewReader(nil)))}, nil |
| } |
| |
| type userAgentTransport struct { |
| userAgent string |
| base http.RoundTripper |
| } |
| |
| func (t userAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) { |
| req.Header.Set("User-Agent", t.userAgent) |
| return t.base.RoundTrip(req) |
| } |
| |
| type rrt struct { |
| gotUserAgent string |
| } |
| |
| func (r *rrt) RoundTrip(req *http.Request) (*http.Response, error) { |
| r.gotUserAgent = req.Header.Get("User-Agent") |
| return &http.Response{Body: io.NopCloser(bytes.NewReader(nil))}, nil |
| } |
| |
| func TestRetry(t *testing.T) { |
| tests := []struct { |
| name string |
| timesToFail int |
| failCode int |
| failErr error |
| response string |
| expectError bool |
| }{ |
| { |
| name: "no retries", |
| response: "test", |
| }, |
| { |
| name: "retry 500 once", |
| response: "test", |
| failCode: 500, |
| timesToFail: 1, |
| }, |
| { |
| name: "retry io.ErrUnexpectedEOF once", |
| response: "test", |
| failErr: io.ErrUnexpectedEOF, |
| timesToFail: 1, |
| }, |
| { |
| name: "retry io.ErrUnexpectedEOF permanent", |
| failErr: io.ErrUnexpectedEOF, |
| timesToFail: maxRetryAttempts + 1, |
| expectError: true, |
| }, |
| } |
| for _, tt := range tests { |
| t.Run(tt.name, func(t *testing.T) { |
| ctx := context.Background() |
| ft := &failingTransport{ |
| timesToFail: tt.timesToFail, |
| failCode: tt.failCode, |
| failErr: tt.failErr, |
| response: tt.response, |
| } |
| c := NewClient(&http.Client{Transport: ft}) |
| s, err := c.GetWithContext(ctx, "") |
| if tt.expectError && err == nil { |
| t.Fatalf("did not receive expected error") |
| } else if !tt.expectError && err != nil { |
| t.Fatalf("unexpected error: %v", err) |
| } |
| |
| expectedCount := ft.failedAttempts + 1 |
| if tt.expectError { |
| expectedCount = ft.failedAttempts |
| } else if s != tt.response { |
| // Responses are only meaningful if err == nil |
| t.Fatalf("c.Get() = %q, want %q", s, tt.response) |
| } |
| |
| if ft.called != expectedCount { |
| t.Fatalf("failed %d times, want %d", ft.called, expectedCount) |
| } |
| }) |
| } |
| } |
| |
| func TestClientGetWithContext(t *testing.T) { |
| tests := []struct { |
| name string |
| ctxTimeout time.Duration |
| wantErr bool |
| }{ |
| { |
| name: "ok", |
| ctxTimeout: 1 * time.Second, |
| }, |
| { |
| name: "times out", |
| ctxTimeout: 200 * time.Millisecond, |
| wantErr: true, |
| }, |
| } |
| for _, tc := range tests { |
| t.Run(tc.name, func(t *testing.T) { |
| ctx, cancel := context.WithTimeout(context.Background(), tc.ctxTimeout) |
| defer cancel() |
| c := NewClient(&http.Client{Transport: sleepyTransport{}}) |
| _, err := c.GetWithContext(ctx, "foo") |
| if tc.wantErr && err == nil { |
| t.Fatal("c.GetWithContext() == nil, want an error") |
| } |
| if !tc.wantErr && err != nil { |
| t.Fatalf("c.GetWithContext() = %v, want nil", err) |
| } |
| }) |
| } |
| } |
| |
| type sleepyTransport struct { |
| } |
| |
| func (s sleepyTransport) RoundTrip(req *http.Request) (*http.Response, error) { |
| req.Context().Done() |
| select { |
| case <-req.Context().Done(): |
| return nil, req.Context().Err() |
| case <-time.After(500 * time.Millisecond): |
| } |
| return &http.Response{StatusCode: http.StatusOK, Body: io.NopCloser(strings.NewReader("I woke up"))}, nil |
| } |
| |
| type failingTransport struct { |
| timesToFail int |
| failCode int |
| failErr error |
| response string |
| |
| failedAttempts int |
| called int |
| } |
| |
| func (r *failingTransport) RoundTrip(req *http.Request) (*http.Response, error) { |
| r.called++ |
| if r.failedAttempts < r.timesToFail { |
| r.failedAttempts++ |
| if r.failErr != nil { |
| return nil, r.failErr |
| } |
| return &http.Response{StatusCode: r.failCode}, nil |
| } |
| return &http.Response{StatusCode: http.StatusOK, Body: io.NopCloser(strings.NewReader(r.response))}, nil |
| } |