838a8e18d3
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>
35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
package emptybackendhandler
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import (
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"net/http"
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"github.com/traefik/traefik/v2/pkg/healthcheck"
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)
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// EmptyBackend is a middleware that checks whether the current Backend
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// has at least one active Server in respect to the healthchecks and if this
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// is not the case, it will stop the middleware chain and respond with 503.
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type emptyBackend struct {
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healthcheck.BalancerStatusHandler
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}
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// New creates a new EmptyBackend middleware.
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func New(lb healthcheck.BalancerStatusHandler) http.Handler {
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return &emptyBackend{BalancerStatusHandler: lb}
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}
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// ServeHTTP responds with 503 when there is no active Server and otherwise
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// invokes the next handler in the middleware chain.
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func (e *emptyBackend) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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if len(e.BalancerStatusHandler.Servers()) != 0 {
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e.BalancerStatusHandler.ServeHTTP(rw, req)
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return
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}
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rw.WriteHeader(http.StatusServiceUnavailable)
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if _, err := rw.Write([]byte(http.StatusText(http.StatusServiceUnavailable))); err != nil {
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http.Error(rw, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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