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Rework servers load-balancer to use the WRR

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Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>
This commit is contained in:
Julien Salleyron 2022-11-16 11:38:07 +01:00 • committed by GitHub
parent 67d9c8da0b
commit fadee5e87b
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GPG key ID: 4AEE18F83AFDEB23
70 changed files with 2085 additions and 2211 deletions
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47
pkg/middlewares/retry/retry.go
View file

@ -20,11 +20,9 @@ import (
)
// Compile time validation that the response writer implements http interfaces correctly.
var _ middlewares.Stateful = &responseWriterWithCloseNotify{}
var _ middlewares.Stateful = &responseWriter{}
const (
typeName = "Retry"
)
const typeName = "Retry"
// Listener is used to inform about retry attempts.
type Listener interface {
@ -149,57 +147,44 @@ func (l Listeners) Retried(req *http.Request, attempt int) {
}
}
type responseWriter interface {
http.ResponseWriter
http.Flusher
ShouldRetry() bool
DisableRetries()
}
func newResponseWriter(rw http.ResponseWriter, shouldRetry bool) responseWriter {
responseWriter := &responseWriterWithoutCloseNotify{
func newResponseWriter(rw http.ResponseWriter, shouldRetry bool) *responseWriter {
return &responseWriter{
responseWriter: rw,
headers: make(http.Header),
shouldRetry: shouldRetry,
}
if _, ok := rw.(http.CloseNotifier); ok {
return &responseWriterWithCloseNotify{
responseWriterWithoutCloseNotify: responseWriter,
}
}
return responseWriter
}
type responseWriterWithoutCloseNotify struct {
type responseWriter struct {
responseWriter http.ResponseWriter
headers http.Header
shouldRetry bool
written bool
}
func (r *responseWriterWithoutCloseNotify) ShouldRetry() bool {
func (r *responseWriter) ShouldRetry() bool {
return r.shouldRetry
}
func (r *responseWriterWithoutCloseNotify) DisableRetries() {
func (r *responseWriter) DisableRetries() {
r.shouldRetry = false
}
func (r *responseWriterWithoutCloseNotify) Header() http.Header {
func (r *responseWriter) Header() http.Header {
if r.written {
return r.responseWriter.Header()
}
return r.headers
}
func (r *responseWriterWithoutCloseNotify) Write(buf []byte) (int, error) {
func (r *responseWriter) Write(buf []byte) (int, error) {
if r.ShouldRetry() {
return len(buf), nil
}
return r.responseWriter.Write(buf)
}
func (r *responseWriterWithoutCloseNotify) WriteHeader(code int) {
func (r *responseWriter) WriteHeader(code int) {
if r.ShouldRetry() && code == http.StatusServiceUnavailable {
// We get a 503 HTTP Status Code when there is no backend server in the pool
// to which the request could be sent. Also, note that r.ShouldRetry()
@ -226,7 +211,7 @@ func (r *responseWriterWithoutCloseNotify) WriteHeader(code int) {
r.written = true
}
func (r *responseWriterWithoutCloseNotify) Hijack() (net.Conn, *bufio.ReadWriter, error) {
func (r *responseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
hijacker, ok := r.responseWriter.(http.Hijacker)
if !ok {
return nil, nil, fmt.Errorf("%T is not a http.Hijacker", r.responseWriter)
@ -234,16 +219,8 @@ func (r *responseWriterWithoutCloseNotify) Hijack() (net.Conn, *bufio.ReadWriter
return hijacker.Hijack()
}
func (r *responseWriterWithoutCloseNotify) Flush() {
func (r *responseWriter) Flush() {
if flusher, ok := r.responseWriter.(http.Flusher); ok {
flusher.Flush()
}
}
type responseWriterWithCloseNotify struct {
*responseWriterWithoutCloseNotify
}
func (r *responseWriterWithCloseNotify) CloseNotify() <-chan bool {
return r.responseWriter.(http.CloseNotifier).CloseNotify()
}