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http.go
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http.go
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// Copyright 2016 The Prometheus 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 main
import (
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"regexp"
"strings"
"github.com/prometheus/common/log"
)
func matchRegularExpressions(reader io.Reader, config HTTPProbe) bool {
body, err := ioutil.ReadAll(reader)
if err != nil {
log.Errorf("Error reading HTTP body: %s", err)
return false
}
for _, expression := range config.FailIfMatchesRegexp {
re, err := regexp.Compile(expression)
if err != nil {
log.Errorf("Could not compile expression %q as regular expression: %s", expression, err)
return false
}
if re.Match(body) {
return false
}
}
for _, expression := range config.FailIfNotMatchesRegexp {
re, err := regexp.Compile(expression)
if err != nil {
log.Errorf("Could not compile expression %q as regular expression: %s", expression, err)
return false
}
if !re.Match(body) {
return false
}
}
return true
}
func probeHTTP(target string, w http.ResponseWriter, module Module) (success bool) {
var isSSL, redirects int
config := module.HTTP
client := &http.Client{
Timeout: module.Timeout,
}
client.CheckRedirect = func(_ *http.Request, via []*http.Request) error {
redirects = len(via)
if redirects > 10 || config.NoFollowRedirects {
return errors.New("Don't follow redirects")
}
return nil
}
if !strings.HasPrefix(target, "http://") && !strings.HasPrefix(target, "https://") {
target = "http://" + target
}
if config.Method == "" {
config.Method = "GET"
}
request, err := http.NewRequest(config.Method, target, nil)
if err != nil {
log.Errorf("Error creating request for target %s: %s", target, err)
return
}
for key, value := range config.Headers {
if strings.Title(key) == "Host" {
request.Host = value
continue
}
request.Header.Set(key, value)
}
resp, err := client.Do(request)
// Err won't be nil if redirects were turned off. See https://github.com/golang/go/issues/3795
if err != nil && resp == nil {
log.Warnf("Error for HTTP request to %s: %s", target, err)
} else {
defer resp.Body.Close()
if len(config.ValidStatusCodes) != 0 {
for _, code := range config.ValidStatusCodes {
if resp.StatusCode == code {
success = true
break
}
}
} else if 200 <= resp.StatusCode && resp.StatusCode < 300 {
success = true
}
if success && (len(config.FailIfMatchesRegexp) > 0 || len(config.FailIfNotMatchesRegexp) > 0) {
success = matchRegularExpressions(resp.Body, config)
}
}
if resp == nil {
resp = &http.Response{}
}
if resp.TLS != nil {
isSSL = 1
fmt.Fprintf(w, "probe_ssl_earliest_cert_expiry %f\n",
float64(getEarliestCertExpiry(resp.TLS).UnixNano())/1e9)
if config.FailIfSSL {
success = false
}
} else if config.FailIfNotSSL {
success = false
}
fmt.Fprintf(w, "probe_http_status_code %d\n", resp.StatusCode)
fmt.Fprintf(w, "probe_http_content_length %d\n", resp.ContentLength)
fmt.Fprintf(w, "probe_http_redirects %d\n", redirects)
fmt.Fprintf(w, "probe_http_ssl %d\n", isSSL)
return
}