92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
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package middlewares
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"testing"
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)
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func TestRetry(t *testing.T) {
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testCases := []struct {
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failAtCalls []int
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attempts int
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responseStatus int
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listener *countingRetryListener
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retriedCount int
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}{
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{
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failAtCalls: []int{1, 2},
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attempts: 3,
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responseStatus: http.StatusOK,
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listener: &countingRetryListener{},
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retriedCount: 2,
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},
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{
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failAtCalls: []int{1, 2},
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attempts: 2,
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responseStatus: http.StatusBadGateway,
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listener: &countingRetryListener{},
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retriedCount: 1,
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},
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}
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for _, tc := range testCases {
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// bind tc locally
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tc := tc
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tcName := fmt.Sprintf("FailAtCalls(%v) RetryAttempts(%v)", tc.failAtCalls, tc.attempts)
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t.Run(tcName, func(t *testing.T) {
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t.Parallel()
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var httpHandler http.Handler
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httpHandler = &networkFailingHTTPHandler{failAtCalls: tc.failAtCalls}
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httpHandler = NewRetry(tc.attempts, httpHandler, tc.listener)
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recorder := httptest.NewRecorder()
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req, err := http.NewRequest("GET", "http://localhost:3000/ok", ioutil.NopCloser(nil))
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if err != nil {
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t.Fatalf("could not create request: %+v", err)
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}
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httpHandler.ServeHTTP(recorder, req)
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if tc.responseStatus != recorder.Code {
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t.Errorf("wrong status code %d, want %d", recorder.Code, tc.responseStatus)
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}
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if tc.retriedCount != tc.listener.timesCalled {
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t.Errorf("RetryListener called %d times, want %d times", tc.listener.timesCalled, tc.retriedCount)
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}
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})
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}
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}
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// networkFailingHTTPHandler is an http.Handler implementation you can use to test retries.
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type networkFailingHTTPHandler struct {
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failAtCalls []int
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callNumber int
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}
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func (handler *networkFailingHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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handler.callNumber++
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for _, failAtCall := range handler.failAtCalls {
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if handler.callNumber == failAtCall {
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w.WriteHeader(http.StatusBadGateway)
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return
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}
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}
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w.WriteHeader(http.StatusOK)
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}
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// countingRetryListener is a RetryListener implementation to count the times the Retried fn is called.
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type countingRetryListener struct {
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timesCalled int
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}
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func (l *countingRetryListener) Retried(attempt int) {
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l.timesCalled++
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}
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