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/**
* Standalone signaling server for the Nextcloud Spreed app.
* Copyright (C) 2017 struktur AG
*
* @author Joachim Bauch <bauch@struktur.de>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package signaling
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net/http"
"net/url"
"sync"
"github.com/prometheus/client_golang/prometheus"
)
func init() {
RegisterHttpClientPoolStats()
}
type Pool struct {
pool chan *http.Client
currentConnections prometheus.Gauge
}
func (p *Pool) get(ctx context.Context) (client *http.Client, err error) {
select {
case <-ctx.Done():
return nil, ctx.Err()
case client := <-p.pool:
p.currentConnections.Inc()
return client, nil
}
}
func (p *Pool) Put(c *http.Client) {
p.currentConnections.Dec()
p.pool <- c
}
func newPool(host string, constructor func() *http.Client, size int) (*Pool, error) {
if size <= 0 {
return nil, fmt.Errorf("can't create empty pool")
}
p := &Pool{
pool: make(chan *http.Client, size),
currentConnections: connectionsPerHostCurrent.WithLabelValues(host),
}
for size > 0 {
c := constructor()
p.pool <- c
size--
}
return p, nil
}
type HttpClientPool struct {
mu sync.Mutex
transport *http.Transport
clients map[string]*Pool
maxConcurrentRequestsPerHost int
}
func NewHttpClientPool(maxConcurrentRequestsPerHost int, skipVerify bool) (*HttpClientPool, error) {
if maxConcurrentRequestsPerHost <= 0 {
return nil, fmt.Errorf("can't create empty pool")
}
tlsconfig := &tls.Config{
InsecureSkipVerify: skipVerify,
}
transport := &http.Transport{
MaxIdleConnsPerHost: maxConcurrentRequestsPerHost,
TLSClientConfig: tlsconfig,
Proxy: http.ProxyFromEnvironment,
}
result := &HttpClientPool{
transport: transport,
clients: make(map[string]*Pool),
maxConcurrentRequestsPerHost: maxConcurrentRequestsPerHost,
}
return result, nil
}
func (p *HttpClientPool) getPool(url *url.URL) (*Pool, error) {
p.mu.Lock()
defer p.mu.Unlock()
if pool, found := p.clients[url.Host]; found {
return pool, nil
}
pool, err := newPool(url.Host, func() *http.Client {
return &http.Client{
Transport: p.transport,
// Only send body in redirect if going to same scheme / host.
CheckRedirect: func(req *http.Request, via []*http.Request) error {
if len(via) >= 10 {
return errors.New("stopped after 10 redirects")
} else if len(via) > 0 {
viaReq := via[len(via)-1]
if req.URL.Scheme != viaReq.URL.Scheme || req.URL.Host != viaReq.URL.Host {
return ErrNotRedirecting
}
}
return nil
},
}
}, p.maxConcurrentRequestsPerHost)
if err != nil {
return nil, err
}
p.clients[url.Host] = pool
return pool, nil
}
func (p *HttpClientPool) Get(ctx context.Context, url *url.URL) (*http.Client, *Pool, error) {
pool, err := p.getPool(url)
if err != nil {
return nil, nil, err
}
client, err := pool.get(ctx)
if err != nil {
return nil, nil, err
}
return client, pool, err
}
|
