mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-28 15:09:39 -08:00
52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
// Package transport provides a round tripper capable of caching HTTP responses.
|
|
package discovery
|
|
|
|
import (
|
|
"net/http"
|
|
"path/filepath"
|
|
|
|
"github.com/gregjones/httpcache"
|
|
"github.com/gregjones/httpcache/diskcache"
|
|
"github.com/peterbourgon/diskv"
|
|
)
|
|
|
|
type cacheRoundTripper struct {
|
|
rt *httpcache.Transport
|
|
}
|
|
|
|
// newCacheRoundTripper creates a roundtripper that reads the ETag on
|
|
// response headers and send the If-None-Match header on subsequent
|
|
// corresponding requests.
|
|
func newCacheRoundTripper(cacheDir string, rt http.RoundTripper) http.RoundTripper {
|
|
d := diskv.New(diskv.Options{
|
|
BasePath: cacheDir,
|
|
TempDir: filepath.Join(cacheDir, ".diskv-temp"),
|
|
})
|
|
t := httpcache.NewTransport(diskcache.NewWithDiskv(d))
|
|
t.Transport = rt
|
|
|
|
return &cacheRoundTripper{rt: t}
|
|
}
|
|
|
|
func (rt *cacheRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
return rt.rt.RoundTrip(req)
|
|
}
|
|
|
|
func (rt *cacheRoundTripper) WrappedRoundTripper() http.RoundTripper { return rt.rt.Transport }
|