forked from prometheus/prometheus
/
client.go
158 lines (137 loc) · 4.63 KB
/
client.go
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// Copyright 2013 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 httputil
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"time"
)
// NewClient returns a http.Client using the specified http.RoundTripper.
func NewClient(rt http.RoundTripper) *http.Client {
return &http.Client{Transport: rt}
}
// NewDeadlineClient returns a new http.Client which will time out long running
// requests.
func NewDeadlineClient(timeout time.Duration, proxyURL *url.URL) *http.Client {
return NewClient(NewDeadlineRoundTripper(timeout, proxyURL))
}
// NewDeadlineRoundTripper returns a new http.RoundTripper which will time out
// long running requests.
func NewDeadlineRoundTripper(timeout time.Duration, proxyURL *url.URL) http.RoundTripper {
return &http.Transport{
// Set proxy (if null, then becomes a direct connection)
Proxy: http.ProxyURL(proxyURL),
// We need to disable keepalive, because we set a deadline on the
// underlying connection.
DisableKeepAlives: true,
Dial: func(netw, addr string) (c net.Conn, err error) {
start := time.Now()
c, err = net.DialTimeout(netw, addr, timeout)
if err != nil {
return nil, err
}
if err = c.SetDeadline(start.Add(timeout)); err != nil {
c.Close()
return nil, err
}
return c, nil
},
}
}
type bearerAuthRoundTripper struct {
bearerToken string
rt http.RoundTripper
}
// NewBearerAuthRoundTripper adds the provided bearer token to a request unless the authorization
// header has already been set.
func NewBearerAuthRoundTripper(bearer string, rt http.RoundTripper) http.RoundTripper {
return &bearerAuthRoundTripper{bearer, rt}
}
func (rt *bearerAuthRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
if len(req.Header.Get("Authorization")) == 0 {
req = cloneRequest(req)
req.Header.Set("Authorization", "Bearer "+rt.bearerToken)
}
return rt.rt.RoundTrip(req)
}
type basicAuthRoundTripper struct {
username string
password string
rt http.RoundTripper
}
// NewBasicAuthRoundTripper will apply a BASIC auth authorization header to a request unless it has
// already been set.
func NewBasicAuthRoundTripper(username, password string, rt http.RoundTripper) http.RoundTripper {
return &basicAuthRoundTripper{username, password, rt}
}
func (rt *basicAuthRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
if len(req.Header.Get("Authorization")) != 0 {
return rt.rt.RoundTrip(req)
}
req = cloneRequest(req)
req.SetBasicAuth(rt.username, rt.password)
return rt.rt.RoundTrip(req)
}
// cloneRequest returns a clone of the provided *http.Request.
// The clone is a shallow copy of the struct and its Header map.
func cloneRequest(r *http.Request) *http.Request {
// Shallow copy of the struct.
r2 := new(http.Request)
*r2 = *r
// Deep copy of the Header.
r2.Header = make(http.Header)
for k, s := range r.Header {
r2.Header[k] = s
}
return r2
}
type TLSOptions struct {
InsecureSkipVerify bool
CAFile string
CertFile string
KeyFile string
ServerName string
}
func NewTLSConfig(opts TLSOptions) (*tls.Config, error) {
tlsConfig := &tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify}
// If a CA cert is provided then let's read it in so we can validate the
// scrape target's certificate properly.
if len(opts.CAFile) > 0 {
caCertPool := x509.NewCertPool()
// Load CA cert.
caCert, err := ioutil.ReadFile(opts.CAFile)
if err != nil {
return nil, fmt.Errorf("unable to use specified CA cert %s: %s", opts.CAFile, err)
}
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig.RootCAs = caCertPool
}
if len(opts.ServerName) > 0 {
tlsConfig.ServerName = opts.ServerName
}
// If a client cert & key is provided then configure TLS config accordingly.
if len(opts.CertFile) > 0 && len(opts.KeyFile) > 0 {
cert, err := tls.LoadX509KeyPair(opts.CertFile, opts.KeyFile)
if err != nil {
return nil, fmt.Errorf("unable to use specified client cert (%s) & key (%s): %s", opts.CertFile, opts.KeyFile, err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
tlsConfig.BuildNameToCertificate()
return tlsConfig, nil
}