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213c869a98
Move implementation to pkg/kubeenv per review; kube.RetryingRoundTripper remains a type alias for API compatibility. pkg/cli uses kubeenv only. Signed-off-by: Sumit Solanki <sumit.solanki@ibm.com>
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package kubeenv holds small, cycle-free Kubernetes client helpers shared by
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// higher-level packages (for example pkg/cli and pkg/kube).
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package kubeenv
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import (
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"bytes"
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"encoding/json"
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"io"
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"net/http"
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"strings"
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)
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// RetryingRoundTripper retries transient Kubernetes API server errors on a
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// wrapped [http.RoundTripper].
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type RetryingRoundTripper struct {
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Wrapped http.RoundTripper
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}
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func (rt *RetryingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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return rt.roundTrip(req, 1, nil)
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}
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func (rt *RetryingRoundTripper) roundTrip(req *http.Request, retry int, prevResp *http.Response) (*http.Response, error) {
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if retry < 0 {
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return prevResp, nil
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}
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resp, rtErr := rt.Wrapped.RoundTrip(req)
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if rtErr != nil {
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return resp, rtErr
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}
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if resp.StatusCode < 500 {
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return resp, rtErr
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}
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if resp.Header.Get("content-type") != "application/json" {
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return resp, rtErr
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}
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b, err := io.ReadAll(resp.Body)
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resp.Body.Close()
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if err != nil {
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return resp, err
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}
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var ke kubernetesError
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r := bytes.NewReader(b)
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err = json.NewDecoder(r).Decode(&ke)
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r.Seek(0, io.SeekStart)
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resp.Body = io.NopCloser(r)
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if err != nil {
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return resp, err
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}
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if ke.Code < 500 {
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return resp, nil
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}
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// Matches messages like "etcdserver: leader changed"
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if strings.HasSuffix(ke.Message, "etcdserver: leader changed") {
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return rt.roundTrip(req, retry-1, resp)
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}
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// Matches messages like "rpc error: code = Unknown desc = raft proposal dropped"
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if strings.HasSuffix(ke.Message, "raft proposal dropped") {
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return rt.roundTrip(req, retry-1, resp)
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}
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return resp, nil
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}
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type kubernetesError struct {
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Message string `json:"message"`
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Code int `json:"code"`
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}
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