traefik/pkg/ping/ping.go

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package ping
import (
"context"
"fmt"
"net/http"
"github.com/containous/mux"
)
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// Handler expose ping routes.
type Handler struct {
EntryPoint string `description:"Ping entryPoint." export:"true"`
Middlewares []string `description:"Middleware list." export:"true"`
terminating bool
}
// SetDefaults sets the default values.
func (h *Handler) SetDefaults() {
h.EntryPoint = "traefik"
}
// WithContext causes the ping endpoint to serve non 200 responses.
func (h *Handler) WithContext(ctx context.Context) {
go func() {
<-ctx.Done()
h.terminating = true
}()
}
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// Append adds ping routes on a router.
func (h *Handler) Append(router *mux.Router) {
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router.Methods(http.MethodGet, http.MethodHead).Path("/ping").
HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
statusCode := http.StatusOK
if h.terminating {
statusCode = http.StatusServiceUnavailable
}
response.WriteHeader(statusCode)
fmt.Fprint(response, http.StatusText(statusCode))
})
}