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app/vmauth: simplify the code after 4a1d29126c

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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4242
This commit is contained in:
Aliaksandr Valialkin 2023-05-17 00:37:03 -07:00
parent da115b5170
commit 6aa8029f30
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GPG Key ID: A72BEC6CD3D0DED1
2 changed files with 23 additions and 38 deletions
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59
app/vmauth/main.go
View File

@ -158,8 +158,9 @@ func processRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
up, headers = ui.DefaultURL, ui.Headers
isDefault = true
}
rtb := &readTrackingBody{ioc: r.Body}
r.Body = rtb
r.Body = &readTrackingBody{
r: r.Body,
}
maxAttempts := up.getBackendsCount()
for i := 0; i < maxAttempts; i++ {
@ -180,7 +181,6 @@ func processRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
}
bu.setBroken()
}
rtb.mustClose()
err := &httpserver.ErrorWithStatusCode{
Err: fmt.Errorf("all the backends for the user %q are unavailable", ui.name()),
StatusCode: http.StatusServiceUnavailable,
@ -195,16 +195,13 @@ func tryProcessingRequest(w http.ResponseWriter, r *http.Request, targetURL *url
for _, h := range headers {
req.Header.Set(h.Name, h.Value)
}
rtb := req.Body.(*readTrackingBody)
transportOnce.Do(transportInit)
res, err := transport.RoundTrip(req)
if err != nil {
remoteAddr := httpserver.GetQuotedRemoteAddr(r)
// NOTE: do not use httpserver.GetRequestURI
// it explicitly reads request body and fail retries
if (r.Method == http.MethodPost || r.Method == http.MethodPut) && !rtb.couldReuseBody() {
// It is impossible to retry POST and PUT requests,
// since we already proxied the request body to the backend.
rtb := req.Body.(*readTrackingBody)
if rtb.readStarted {
// Request body has been already read, so it is impossible to retry the request.
// Return the error to the client then.
err = &httpserver.ErrorWithStatusCode{
Err: fmt.Errorf("cannot proxy the request to %q: %w", targetURL, err),
StatusCode: http.StatusServiceUnavailable,
@ -212,6 +209,10 @@ func tryProcessingRequest(w http.ResponseWriter, r *http.Request, targetURL *url
httpserver.Errorf(w, r, "%s", err)
return true
}
// Retry the request if its body wasn't read yet. This usually means that the backend isn't reachable.
remoteAddr := httpserver.GetQuotedRemoteAddr(r)
// NOTE: do not use httpserver.GetRequestURI
// it explicitly reads request body and fails retries.
logger.Warnf("remoteAddr: %s; requestURI: %s; error when proxying the request to %q: %s", remoteAddr, req.URL, targetURL, err)
return false
}
@ -223,7 +224,6 @@ func tryProcessingRequest(w http.ResponseWriter, r *http.Request, targetURL *url
copyBuf.B = bytesutil.ResizeNoCopyNoOverallocate(copyBuf.B, 16*1024)
_, err = io.CopyBuffer(w, res.Body, copyBuf.B)
copyBufPool.Put(copyBuf)
rtb.mustClose()
if err != nil && !netutil.IsTrivialNetworkError(err) {
remoteAddr := httpserver.GetQuotedRemoteAddr(r)
requestURI := httpserver.GetRequestURI(r)
@ -357,41 +357,26 @@ func handleConcurrencyLimitError(w http.ResponseWriter, r *http.Request, err err
}
type readTrackingBody struct {
ioc io.ReadCloser
wasClosed bool
wasRead bool
r io.ReadCloser
readStarted bool
}
// Read implements io.Reader interface
// tracks body reading requests
func (rtb *readTrackingBody) Read(p []byte) (int, error) {
if rtb.wasClosed {
return 0, io.EOF
if len(p) > 0 {
rtb.readStarted = true
}
rtb.wasRead = true
return rtb.ioc.Read(p)
return rtb.r.Read(p)
}
// Close implements interface.
// Closes body only if Read call was performed.
// http.Roundtrip performs body.Close call even without any Read calls
// so this hack allows us to reuse request body
// Close implements io.Closer interface.
func (rtb *readTrackingBody) Close() error {
if rtb.wasRead {
err := rtb.ioc.Close()
rtb.wasClosed = true
return err
// Close rtb.r only if at least a single Read call was performed.
// http.Roundtrip performs body.Close call even without any Read calls
// so this hack allows us to reuse request body
if rtb.readStarted {
return rtb.r.Close()
}
return nil
}
// body could be reused only if read operation wasn't called
func (rtb *readTrackingBody) couldReuseBody() bool {
return !rtb.wasRead
}
// mustClose explicitly closes body
func (rtb *readTrackingBody) mustClose() {
rtb.wasClosed = true
rtb.ioc.Close()
}

2
docs/CHANGELOG.md
View File

@ -46,7 +46,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
* FEATURE: [vmauth](https://docs.victoriametrics.com/vmauth.html): add ability to filter incoming requests by IP. See [these docs](https://docs.victoriametrics.com/vmauth.html#ip-filters) and [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3491).
* FEATURE: [vmauth](https://docs.victoriametrics.com/vmauth.html): add ability to proxy requests to the specified backends for unauthorized users. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4083).
* FEATURE: [vmauth](https://docs.victoriametrics.com/vmauth.html): add ability to specify default route for unmatched requests. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4084).
* FEATURE: [vmauth](https://docs.victoriametrics.com/vmauth.html): add ability to retry requests for common tcp dial error for POST and PUT requests. Previously load-balancing algorythm didn't retry such errors.
* FEATURE: [vmauth](https://docs.victoriametrics.com/vmauth.html): retry `POST` requests on the remaining backends if the currently selected backend isn't reachable. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4242).
* FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): add ability to compare the data for the previous day with the data for the current day at [Cardinality Explorer](https://docs.victoriametrics.com/#cardinality-explorer). See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3967).
* FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): display histograms as heatmaps in [Metrics explorer](https://docs.victoriametrics.com/#metrics-explorer). See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4111).
* FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): add `WITH template` playground. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3811).