prometheus/vendor/github.com/julienschmidt/httprouter/params_go17.go

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// +build go1.7
package httprouter
import (
"context"
"net/http"
)
type paramsKey struct{}
// ParamsKey is the request context key under which URL params are stored.
//
// This is only present from go 1.7.
var ParamsKey = paramsKey{}
// Handler is an adapter which allows the usage of an http.Handler as a
// request handle. With go 1.7+, the Params will be available in the
// request context under ParamsKey.
func (r *Router) Handler(method, path string, handler http.Handler) {
r.Handle(method, path,
func(w http.ResponseWriter, req *http.Request, p Params) {
ctx := req.Context()
ctx = context.WithValue(ctx, ParamsKey, p)
req = req.WithContext(ctx)
handler.ServeHTTP(w, req)
},
)
}
// ParamsFromContext pulls the URL parameters from a request context,
// or returns nil if none are present.
//
// This is only present from go 1.7.
func ParamsFromContext(ctx context.Context) Params {
p, _ := ctx.Value(ParamsKey).(Params)
return p
}