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healthcheck: add support at the load-balancers of services level

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Co-authored-by: Dmitry Sharshakov <d3dx12.xx@gmail.com>
Co-authored-by: Julien Salleyron <julien.salleyron@gmail.com>
Co-authored-by: Jean-Baptiste Doumenjou <925513+jbdoumenjou@users.noreply.github.com>
Co-authored-by: Romain <rtribotte@users.noreply.github.com>
Co-authored-by: Tom Moulard <tom.moulard@traefik.io>
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mpl 2021-06-25 21:08:11 +02:00 • committed by GitHub
parent 5e3e47b484
commit 838a8e18d3
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28 changed files with 1196 additions and 120 deletions
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23
pkg/middlewares/emptybackendhandler/empty_backend_handler.go
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@ -10,24 +10,25 @@ import (
// has at least one active Server in respect to the healthchecks and if this
// is not the case, it will stop the middleware chain and respond with 503.
type emptyBackend struct {
next healthcheck.BalancerHandler
healthcheck.BalancerStatusHandler
}
// New creates a new EmptyBackend middleware.
func New(lb healthcheck.BalancerHandler) http.Handler {
return &emptyBackend{next: lb}
func New(lb healthcheck.BalancerStatusHandler) http.Handler {
return &emptyBackend{BalancerStatusHandler: lb}
}
// ServeHTTP responds with 503 when there is no active Server and otherwise
// invokes the next handler in the middleware chain.
func (e *emptyBackend) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if len(e.next.Servers()) == 0 {
rw.WriteHeader(http.StatusServiceUnavailable)
_, err := rw.Write([]byte(http.StatusText(http.StatusServiceUnavailable)))
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
} else {
e.next.ServeHTTP(rw, req)
if len(e.BalancerStatusHandler.Servers()) != 0 {
e.BalancerStatusHandler.ServeHTTP(rw, req)
return
}
rw.WriteHeader(http.StatusServiceUnavailable)
if _, err := rw.Write([]byte(http.StatusText(http.StatusServiceUnavailable))); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
}