Andrew Beresford
cf70a0cbe1
Exposes TCP keepalive configuration via listener and dialer metadata: keepalive: true keepalive.idle: 30s keepalive.interval: 10s keepalive.count: 6 When enabled, the OS sends keepalive probes after the idle period and tears down the socket if the remote does not respond. This causes any blocked Read() on a dead connection to return promptly, releasing goroutines and memory — covering both legs of a CONNECT tunnel (the inbound client connection via the listener, and the outbound upstream connection via the dialer). This is the correct alternative to a hard application-level read deadline (SetReadDeadline) for detecting dead connections, as it distinguishes truly dead connections from legitimately idle ones. Relates to: https://github.com/go-gost/x/issues/91
72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package tcp
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
|
|
"github.com/go-gost/core/dialer"
|
|
"github.com/go-gost/core/logger"
|
|
md "github.com/go-gost/core/metadata"
|
|
xctx "github.com/go-gost/x/ctx"
|
|
"github.com/go-gost/x/internal/net/proxyproto"
|
|
"github.com/go-gost/x/registry"
|
|
)
|
|
|
|
func init() {
|
|
registry.DialerRegistry().Register("tcp", NewDialer)
|
|
}
|
|
|
|
type tcpDialer struct {
|
|
md metadata
|
|
logger logger.Logger
|
|
options dialer.Options
|
|
}
|
|
|
|
func NewDialer(opts ...dialer.Option) dialer.Dialer {
|
|
options := dialer.Options{}
|
|
for _, opt := range opts {
|
|
opt(&options)
|
|
}
|
|
|
|
return &tcpDialer{
|
|
logger: options.Logger,
|
|
options: options,
|
|
}
|
|
}
|
|
|
|
func (d *tcpDialer) Init(md md.Metadata) (err error) {
|
|
return d.parseMetadata(md)
|
|
}
|
|
|
|
func (d *tcpDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (net.Conn, error) {
|
|
var options dialer.DialOptions
|
|
for _, opt := range opts {
|
|
opt(&options)
|
|
}
|
|
|
|
conn, err := options.Dialer.Dial(ctx, "tcp", addr)
|
|
if err != nil {
|
|
d.logger.Error(err)
|
|
return conn, err
|
|
}
|
|
|
|
if d.md.keepalive {
|
|
if tc, ok := conn.(*net.TCPConn); ok {
|
|
tc.SetKeepAliveConfig(net.KeepAliveConfig{
|
|
Enable: true,
|
|
Idle: d.md.keepaliveIdle,
|
|
Interval: d.md.keepaliveInterval,
|
|
Count: d.md.keepaliveCount,
|
|
})
|
|
}
|
|
}
|
|
|
|
conn = proxyproto.WrapClientConn(
|
|
d.options.ProxyProtocol,
|
|
xctx.SrcAddrFromContext(ctx),
|
|
xctx.DstAddrFromContext(ctx),
|
|
conn)
|
|
|
|
return conn, err
|
|
}
|