5a6acf85fa
Align the behavior of HTTP-based lifecycle handlers and HTTP-based probers, converging on the probers implementation. This fixes multiple deficiencies in the current implementation of lifecycle handlers surrounding what functionality is available. The functionality is gated by the features.ConsistentHTTPGetHandlers feature gate.
120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
/*
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Copyright 2022 The Kubernetes 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 http
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import (
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"fmt"
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"net"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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v1 "k8s.io/api/core/v1"
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"k8s.io/component-base/version"
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"k8s.io/kubernetes/pkg/probe"
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)
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// NewProbeRequest returns an http.Request suitable for use as a request for a
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// probe.
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func NewProbeRequest(url *url.URL, headers http.Header) (*http.Request, error) {
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return newProbeRequest(url, headers, "probe")
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}
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// NewRequestForHTTPGetAction returns an http.Request derived from httpGet.
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// When httpGet.Host is empty, podIP will be used instead.
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func NewRequestForHTTPGetAction(httpGet *v1.HTTPGetAction, container *v1.Container, podIP string, userAgentFragment string) (*http.Request, error) {
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scheme := strings.ToLower(string(httpGet.Scheme))
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if scheme == "" {
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scheme = "http"
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}
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host := httpGet.Host
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if host == "" {
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host = podIP
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}
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port, err := probe.ResolveContainerPort(httpGet.Port, container)
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if err != nil {
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return nil, err
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}
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path := httpGet.Path
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url := formatURL(scheme, host, port, path)
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headers := v1HeaderToHTTPHeader(httpGet.HTTPHeaders)
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return newProbeRequest(url, headers, userAgentFragment)
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}
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func newProbeRequest(url *url.URL, headers http.Header, userAgentFragment string) (*http.Request, error) {
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req, err := http.NewRequest("GET", url.String(), nil)
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if err != nil {
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return nil, err
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}
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if headers == nil {
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headers = http.Header{}
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}
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if _, ok := headers["User-Agent"]; !ok {
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// User-Agent header was not defined, set it
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headers.Set("User-Agent", userAgent(userAgentFragment))
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}
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if _, ok := headers["Accept"]; !ok {
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// Accept header was not defined. accept all
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headers.Set("Accept", "*/*")
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} else if headers.Get("Accept") == "" {
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// Accept header was overridden but is empty. removing
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headers.Del("Accept")
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}
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req.Header = headers
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req.Host = headers.Get("Host")
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return req, nil
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}
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func userAgent(purpose string) string {
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v := version.Get()
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return fmt.Sprintf("kube-%s/%s.%s", purpose, v.Major, v.Minor)
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}
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// formatURL formats a URL from args. For testability.
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func formatURL(scheme string, host string, port int, path string) *url.URL {
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u, err := url.Parse(path)
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// Something is busted with the path, but it's too late to reject it. Pass it along as is.
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//
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// This construction of a URL may be wrong in some cases, but it preserves
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// legacy prober behavior.
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if err != nil {
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u = &url.URL{
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Path: path,
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}
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}
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u.Scheme = scheme
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u.Host = net.JoinHostPort(host, strconv.Itoa(port))
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return u
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}
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// v1HeaderToHTTPHeader takes a list of HTTPHeader <name, value> string pairs
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// and returns a populated string->[]string http.Header map.
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func v1HeaderToHTTPHeader(headerList []v1.HTTPHeader) http.Header {
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headers := make(http.Header)
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for _, header := range headerList {
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headers[header.Name] = append(headers[header.Name], header.Value)
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}
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return headers
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}
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