mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-07-27 13:37:30 +00:00
124 lines
3.5 KiB
Go
124 lines
3.5 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package gensupport
|
|
|
|
import (
|
|
"context"
|
|
"encoding/json"
|
|
"errors"
|
|
"net/http"
|
|
"time"
|
|
)
|
|
|
|
// SendRequest sends a single HTTP request using the given client.
|
|
// If ctx is non-nil, it calls all hooks, then sends the request with
|
|
// req.WithContext, then calls any functions returned by the hooks in
|
|
// reverse order.
|
|
func SendRequest(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
|
// Disallow Accept-Encoding because it interferes with the automatic gzip handling
|
|
// done by the default http.Transport. See https://github.com/google/google-api-go-client/issues/219.
|
|
if _, ok := req.Header["Accept-Encoding"]; ok {
|
|
return nil, errors.New("google api: custom Accept-Encoding headers not allowed")
|
|
}
|
|
if ctx == nil {
|
|
return client.Do(req)
|
|
}
|
|
return send(ctx, client, req)
|
|
}
|
|
|
|
func send(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
|
if client == nil {
|
|
client = http.DefaultClient
|
|
}
|
|
resp, err := client.Do(req.WithContext(ctx))
|
|
// If we got an error, and the context has been canceled,
|
|
// the context's error is probably more useful.
|
|
if err != nil {
|
|
select {
|
|
case <-ctx.Done():
|
|
err = ctx.Err()
|
|
default:
|
|
}
|
|
}
|
|
return resp, err
|
|
}
|
|
|
|
// SendRequestWithRetry sends a single HTTP request using the given client,
|
|
// with retries if a retryable error is returned.
|
|
// If ctx is non-nil, it calls all hooks, then sends the request with
|
|
// req.WithContext, then calls any functions returned by the hooks in
|
|
// reverse order.
|
|
func SendRequestWithRetry(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
|
// Disallow Accept-Encoding because it interferes with the automatic gzip handling
|
|
// done by the default http.Transport. See https://github.com/google/google-api-go-client/issues/219.
|
|
if _, ok := req.Header["Accept-Encoding"]; ok {
|
|
return nil, errors.New("google api: custom Accept-Encoding headers not allowed")
|
|
}
|
|
if ctx == nil {
|
|
return client.Do(req)
|
|
}
|
|
return sendAndRetry(ctx, client, req)
|
|
}
|
|
|
|
func sendAndRetry(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
|
|
if client == nil {
|
|
client = http.DefaultClient
|
|
}
|
|
|
|
var resp *http.Response
|
|
var err error
|
|
|
|
// Loop to retry the request, up to the context deadline.
|
|
var pause time.Duration
|
|
bo := backoff()
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
// If we got an error, and the context has been canceled,
|
|
// the context's error is probably more useful.
|
|
if err == nil {
|
|
err = ctx.Err()
|
|
}
|
|
return resp, err
|
|
case <-time.After(pause):
|
|
}
|
|
|
|
resp, err = client.Do(req.WithContext(ctx))
|
|
|
|
var status int
|
|
if resp != nil {
|
|
status = resp.StatusCode
|
|
}
|
|
|
|
// Check if we can retry the request. A retry can only be done if the error
|
|
// is retryable and the request body can be re-created using GetBody (this
|
|
// will not be possible if the body was unbuffered).
|
|
if req.GetBody == nil || !shouldRetry(status, err) {
|
|
break
|
|
}
|
|
var errBody error
|
|
req.Body, errBody = req.GetBody()
|
|
if errBody != nil {
|
|
break
|
|
}
|
|
|
|
pause = bo.Pause()
|
|
if resp != nil && resp.Body != nil {
|
|
resp.Body.Close()
|
|
}
|
|
}
|
|
return resp, err
|
|
}
|
|
|
|
// DecodeResponse decodes the body of res into target. If there is no body,
|
|
// target is unchanged.
|
|
func DecodeResponse(target interface{}, res *http.Response) error {
|
|
if res.StatusCode == http.StatusNoContent {
|
|
return nil
|
|
}
|
|
return json.NewDecoder(res.Body).Decode(target)
|
|
}
|