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Merge pull request #802 from prometheus/beorn7/fallback 

API client: Enable fallback on status code 501, too
This commit is contained in:
Björn Rabenstein 2020-09-10 16:16:53 +02:00 committed by GitHub
parent 65c5578b2d 64b4a9cf9d
commit 6007b2b5ca
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 29 additions and 5 deletions
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5
api/prometheus/v1/api.go
View File

@ -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 {
@ -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 {

29
api/prometheus/v1/api_test.go
View File

@ -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.
@ -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)