traefik/middlewares/retry_test.go

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