mirror of https://github.com/k3s-io/k3s
105 lines
3.5 KiB
Go
105 lines
3.5 KiB
Go
/*
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Copyright 2015 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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"crypto/tls"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"time"
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utilnet "k8s.io/apimachinery/pkg/util/net"
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"k8s.io/kubernetes/pkg/probe"
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"k8s.io/kubernetes/pkg/version"
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"k8s.io/klog"
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)
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// New creates Prober that will skip TLS verification while probing.
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func New() Prober {
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tlsConfig := &tls.Config{InsecureSkipVerify: true}
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return NewWithTLSConfig(tlsConfig)
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}
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// NewWithTLSConfig takes tls config as parameter.
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func NewWithTLSConfig(config *tls.Config) Prober {
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transport := utilnet.SetTransportDefaults(&http.Transport{TLSClientConfig: config, DisableKeepAlives: true})
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return httpProber{transport}
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}
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// Prober is an interface that defines the Probe function for doing HTTP readiness/liveness checks.
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type Prober interface {
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Probe(url *url.URL, headers http.Header, timeout time.Duration) (probe.Result, string, error)
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}
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type httpProber struct {
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transport *http.Transport
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}
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// Probe returns a ProbeRunner capable of running an HTTP check.
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func (pr httpProber) Probe(url *url.URL, headers http.Header, timeout time.Duration) (probe.Result, string, error) {
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return DoHTTPProbe(url, headers, &http.Client{Timeout: timeout, Transport: pr.transport})
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}
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// GetHTTPInterface is an interface for making HTTP requests, that returns a response and error.
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type GetHTTPInterface interface {
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Do(req *http.Request) (*http.Response, error)
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}
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// DoHTTPProbe checks if a GET request to the url succeeds.
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// If the HTTP response code is successful (i.e. 400 > code >= 200), it returns Success.
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// If the HTTP response code is unsuccessful or HTTP communication fails, it returns Failure.
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// This is exported because some other packages may want to do direct HTTP probes.
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func DoHTTPProbe(url *url.URL, headers http.Header, client GetHTTPInterface) (probe.Result, string, error) {
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req, err := http.NewRequest("GET", url.String(), nil)
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if err != nil {
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// Convert errors into failures to catch timeouts.
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return probe.Failure, err.Error(), nil
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}
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if _, ok := headers["User-Agent"]; !ok {
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if headers == nil {
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headers = http.Header{}
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}
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// explicitly set User-Agent so it's not set to default Go value
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v := version.Get()
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headers.Set("User-Agent", fmt.Sprintf("kube-probe/%s.%s", v.Major, v.Minor))
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}
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req.Header = headers
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if headers.Get("Host") != "" {
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req.Host = headers.Get("Host")
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}
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res, err := client.Do(req)
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if err != nil {
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// Convert errors into failures to catch timeouts.
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return probe.Failure, err.Error(), nil
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}
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defer res.Body.Close()
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b, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return probe.Failure, "", err
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}
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body := string(b)
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if res.StatusCode >= http.StatusOK && res.StatusCode < http.StatusBadRequest {
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klog.V(4).Infof("Probe succeeded for %s, Response: %v", url.String(), *res)
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return probe.Success, body, nil
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}
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klog.V(4).Infof("Probe failed for %s with request headers %v, response body: %v", url.String(), headers, body)
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return probe.Failure, fmt.Sprintf("HTTP probe failed with statuscode: %d", res.StatusCode), nil
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}
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