k3s/pkg/cluster/router.go

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package cluster
import (
"net/http"
)
// getHandler returns a basic request handler that processes requests through
// the cluster's request router chain.
func (c *Cluster) getHandler(handler http.Handler) (http.Handler, error) {
next := c.router()
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
handler.ServeHTTP(rw, req)
next.ServeHTTP(rw, req)
}), nil
}
// router is a stub request router that returns a Service Unavailable response
// if no additional handlers are available.
func (c *Cluster) router() http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if c.config.Runtime.Handler == nil {
http.Error(rw, "starting", http.StatusServiceUnavailable)
return
}
c.config.Runtime.Handler.ServeHTTP(rw, req)
})
}