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API client: Enable fallback on status code 501, too #802

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merged 1 commit into from Sep 10, 2020
Merged

API client: Enable fallback on status code 501, too #802

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5 changes: 3 additions & 2 deletions api/prometheus/v1/api.go
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Expand Up @@ -1004,7 +1004,8 @@ func (h *apiClientImpl) Do(ctx context.Context, req *http.Request) (*http.Respon

}

// DoGetFallback will attempt to do the request as-is, and on a 405 it will fallback to a GET request.
// DoGetFallback will attempt to do the request as-is, and on a 405 or 501 it
// will fallback to a GET request.
func (h *apiClientImpl) DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, Warnings, error) {
req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(args.Encode()))
if err != nil {
Expand All @@ -1013,7 +1014,7 @@ func (h *apiClientImpl) DoGetFallback(ctx context.Context, u *url.URL, args url.
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

resp, body, warnings, err := h.Do(ctx, req)
if resp != nil && resp.StatusCode == http.StatusMethodNotAllowed {
if resp != nil && (resp.StatusCode == http.StatusMethodNotAllowed || resp.StatusCode == http.StatusNotImplemented) {
u.RawQuery = args.Encode()
req, err = http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
Expand Down
29 changes: 26 additions & 3 deletions api/prometheus/v1/api_test.go
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Expand Up @@ -1447,12 +1447,19 @@ func TestDoGetFallback(t *testing.T) {
body, _ := json.Marshal(apiResp)

if req.Method == http.MethodPost {
if req.URL.Path == "/blockPost" {
if req.URL.Path == "/blockPost405" {
http.Error(w, string(body), http.StatusMethodNotAllowed)
return
}
}

if req.Method == http.MethodPost {
if req.URL.Path == "/blockPost501" {
http.Error(w, string(body), http.StatusNotImplemented)
return
}
}

w.Write(body)
}))
// Close the server when test finishes.
Expand Down Expand Up @@ -1483,8 +1490,24 @@ func TestDoGetFallback(t *testing.T) {
t.Fatalf("Mismatch in values")
}

// Do a fallbcak to a get.
u.Path = "/blockPost"
// Do a fallback to a get on 405.
u.Path = "/blockPost405"
_, b, _, err = api.DoGetFallback(context.TODO(), u, v)
if err != nil {
t.Fatalf("Error doing local request: %v", err)
}
if err := json.Unmarshal(b, resp); err != nil {
t.Fatal(err)
}
if resp.Method != http.MethodGet {
t.Fatalf("Mismatch method")
}
if resp.Values != v.Encode() {
t.Fatalf("Mismatch in values")
}

// Do a fallback to a get on 501.
u.Path = "/blockPost501"
_, b, _, err = api.DoGetFallback(context.TODO(), u, v)
if err != nil {
t.Fatalf("Error doing local request: %v", err)
Expand Down