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request.go
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request.go
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// Copyright 2019-2023 The Cloudprober Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package http
import (
"fmt"
"net"
"net/http"
"strconv"
"strings"
"github.com/cloudprober/cloudprober/common/iputils"
"github.com/cloudprober/cloudprober/internal/httpreq"
"github.com/cloudprober/cloudprober/logger"
configpb "github.com/cloudprober/cloudprober/probes/http/proto"
"github.com/cloudprober/cloudprober/targets/endpoint"
"golang.org/x/oauth2"
)
const relURLLabel = "relative_url"
func hostWithPort(host string, port int) string {
if port == 0 {
return host
}
return fmt.Sprintf("%s:%d", host, port)
}
// Put square brackets around literal IPv6 hosts.
func handleIPv6(host string) string {
ip := net.ParseIP(host)
if ip == nil {
return host
}
if iputils.IPVersion(ip) == 6 {
return "[" + host + "]"
}
return host
}
func (p *Probe) schemeForTarget(target endpoint.Endpoint) string {
switch p.c.SchemeType.(type) {
case *configpb.ProbeConf_Scheme_:
return strings.ToLower(p.c.GetScheme().String())
case *configpb.ProbeConf_Protocol:
return strings.ToLower(p.c.GetProtocol().String())
}
for _, label := range []string{"__cp_scheme__"} {
if target.Labels[label] != "" {
return strings.ToLower(target.Labels[label])
}
}
return "http"
}
func hostForTarget(target endpoint.Endpoint) string {
for _, label := range []string{"fqdn", "__cp_host__"} {
if target.Labels[label] != "" {
return handleIPv6(target.Labels[label])
}
}
return handleIPv6(target.Name)
}
func pathForTarget(target endpoint.Endpoint, probeURL string) string {
if probeURL != "" {
return probeURL
}
for _, label := range []string{relURLLabel, "__cp_path__"} {
if path := target.Labels[label]; path != "" {
if !strings.HasPrefix(path, "/") {
return "/" + path
}
return path
}
}
return ""
}
func (p *Probe) resolveFirst(target endpoint.Endpoint) bool {
if p.c.ResolveFirst != nil {
return p.c.GetResolveFirst()
}
return target.IP != nil
}
// setHeaders computes setHeaders for a target. Host header is computed slightly
// differently than other setHeaders.
// - If host header is set in the probe, it overrides everything else.
// - Otherwise we use target's host (computed elsewhere) along with port.
func (p *Probe) setHeaders(req *http.Request, host string, port int) {
var hostHeader string
for _, h := range p.c.GetHeaders() {
if h.GetName() == "Host" {
hostHeader = h.GetValue()
continue
}
req.Header.Set(h.GetName(), h.GetValue())
}
for k, v := range p.c.GetHeader() {
if k == "Host" {
hostHeader = v
continue
}
req.Header.Set(k, v)
}
if hostHeader == "" {
hostHeader = hostWithPort(host, port)
}
req.Host = hostHeader
}
func (p *Probe) urlHostAndIPLabel(target endpoint.Endpoint, host string) (string, string, error) {
if !p.resolveFirst(target) {
return host, "", nil
}
ip, err := target.Resolve(p.opts.IPVersion, p.opts.Targets, endpoint.WithNameOverride(host))
if err != nil {
return "", "", fmt.Errorf("error resolving target: %s, %v", target.Name, err)
}
ipStr := ip.String()
return handleIPv6(ipStr), ipStr, nil
}
func (p *Probe) httpRequestForTarget(target endpoint.Endpoint) *http.Request {
// Prepare HTTP.Request for Client.Do
port := int(p.c.GetPort())
// If port is not configured explicitly, use target's port if available.
if port == 0 {
port = target.Port
}
host := hostForTarget(target)
urlHost, ipForLabel, err := p.urlHostAndIPLabel(target, host)
if err != nil {
// We just return a nil request. The caller will skip nil requests.
p.l.Error(err.Error())
return nil
}
for _, al := range p.opts.AdditionalLabels {
al.UpdateForTarget(target, ipForLabel, port)
}
url := fmt.Sprintf("%s://%s%s", p.schemeForTarget(target), hostWithPort(urlHost, port), pathForTarget(target, p.url))
req, err := httpreq.NewRequest(p.method, url, p.requestBody)
if err != nil {
p.l.Error("target: ", target.Name, ", error creating HTTP request: ", err.Error())
return nil
}
p.setHeaders(req, host, port)
if p.c.GetUserAgent() != "" {
req.Header.Set("User-Agent", p.c.GetUserAgent())
}
return req
}
func getToken(ts oauth2.TokenSource, l *logger.Logger) (string, error) {
tok, err := ts.Token()
if err != nil {
return "", err
}
l.Debug("Got OAuth token, len: ", strconv.FormatInt(int64(len(tok.AccessToken)), 10), ", expirationTime: ", tok.Expiry.String())
if tok.AccessToken != "" {
return tok.AccessToken, nil
}
idToken, ok := tok.Extra("id_token").(string)
if ok {
return idToken, nil
}
return "", fmt.Errorf("got unknown token: %v", tok)
}
func (p *Probe) prepareRequest(req *http.Request) *http.Request {
// We clone the request for the cases where we modify the request:
// -- if request has a body, each request gets its own Body
// as HTTP transport reads body in a streaming fashion, and we can't
// share it across multiple requests.
// -- if OAuth token is used, each request gets its own Authorization
// header.
if p.oauthTS == nil && p.requestBody.Len() == 0 {
return req
}
req = req.Clone(req.Context())
if p.oauthTS != nil {
tok, err := getToken(p.oauthTS, p.l)
// Note: We don't terminate the request if there is an error in getting
// token. That is to avoid complicating the flow, and to make sure that
// OAuth refresh failures show in probe failures.
if err != nil {
p.l.Error("Error getting OAuth token: ", err.Error())
tok = "<token-missing>"
}
req.Header.Set("Authorization", "Bearer "+tok)
}
req.Body = p.requestBody.Reader()
return req
}