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pool.go
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pool.go
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// Copyright (C) 2017 Michał Matczuk
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tunnel
import (
"fmt"
"net"
"net/http"
"sync"
"golang.org/x/net/http2"
"github.com/mmatczuk/go-http-tunnel/id"
)
type onDisconnectListener func(identifier id.ID)
type connPair struct {
conn net.Conn
clientConn *http2.ClientConn
}
type connPool struct {
t *http2.Transport
conns map[string]connPair // key is host:port
listener onDisconnectListener
mu sync.RWMutex
}
func newConnPool(t *http2.Transport, l onDisconnectListener) *connPool {
return &connPool{
t: t,
listener: l,
conns: make(map[string]connPair),
}
}
func (p *connPool) GetClientConn(req *http.Request, addr string) (*http2.ClientConn, error) {
p.mu.RLock()
defer p.mu.RUnlock()
if cp, ok := p.conns[addr]; ok && cp.clientConn.CanTakeNewRequest() {
return cp.clientConn, nil
}
return nil, errClientNotConnected
}
func (p *connPool) MarkDead(c *http2.ClientConn) {
p.mu.Lock()
defer p.mu.Unlock()
for addr, cp := range p.conns {
if cp.clientConn == c {
cp.conn.Close()
delete(p.conns, addr)
if p.listener != nil {
p.listener(p.addrToIdentifier(addr))
}
return
}
}
}
func (p *connPool) AddConn(conn net.Conn, identifier id.ID) error {
p.mu.Lock()
defer p.mu.Unlock()
addr := p.addr(identifier)
if _, ok := p.conns[addr]; ok {
return errClientAlreadyConnected
}
c, err := p.t.NewClientConn(conn)
if err != nil {
return err
}
p.conns[addr] = connPair{
conn: conn,
clientConn: c,
}
return nil
}
func (p *connPool) DeleteConn(identifier id.ID) {
p.mu.Lock()
defer p.mu.Unlock()
addr := p.addr(identifier)
if cp, ok := p.conns[addr]; ok {
cp.conn.Close()
delete(p.conns, addr)
if p.listener != nil {
p.listener(identifier)
}
}
}
func (p *connPool) URL(identifier id.ID) string {
return fmt.Sprint("https://", identifier)
}
func (p *connPool) addr(identifier id.ID) string {
return fmt.Sprint(identifier.String(), ":443")
}
func (p *connPool) addrToIdentifier(addr string) id.ID {
identifier := id.ID{}
identifier.UnmarshalText([]byte(addr[:len(addr)-4]))
return identifier
}