peridot/vendor/github.com/go-openapi/runtime/client/keepalive.go

54 lines
1.2 KiB
Go
Raw Normal View History

2022-07-07 20:11:50 +00:00
package client
import (
"io"
"io/ioutil"
"net/http"
"sync/atomic"
)
// KeepAliveTransport drains the remaining body from a response
// so that go will reuse the TCP connections.
// This is not enabled by default because there are servers where
// the response never gets closed and that would make the code hang forever.
// So instead it's provided as a http client middleware that can be used to override
// any request.
func KeepAliveTransport(rt http.RoundTripper) http.RoundTripper {
return &keepAliveTransport{wrapped: rt}
}
type keepAliveTransport struct {
wrapped http.RoundTripper
}
func (k *keepAliveTransport) RoundTrip(r *http.Request) (*http.Response, error) {
resp, err := k.wrapped.RoundTrip(r)
if err != nil {
return resp, err
}
resp.Body = &drainingReadCloser{rdr: resp.Body}
return resp, nil
}
type drainingReadCloser struct {
rdr io.ReadCloser
seenEOF uint32
}
func (d *drainingReadCloser) Read(p []byte) (n int, err error) {
n, err = d.rdr.Read(p)
if err == io.EOF || n == 0 {
atomic.StoreUint32(&d.seenEOF, 1)
}
return
}
func (d *drainingReadCloser) Close() error {
// drain buffer
if atomic.LoadUint32(&d.seenEOF) != 1 {
//#nosec
io.Copy(ioutil.Discard, d.rdr)
}
return d.rdr.Close()
}