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Userspace Proxy: Expose ProxySocket utility funcs

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This commit exposes several utility functions that are valuable for
implementing custom ProxySockets.
This commit is contained in:
Solly Ross 2016-08-18 14:11:05 -04:00
parent de2285ac7b
commit f5526727fb
1 changed files with 10 additions and 8 deletions
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18
pkg/proxy/userspace/proxysocket.go
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@ -73,7 +73,7 @@ func newProxySocket(protocol api.Protocol, ip net.IP, port int) (ProxySocket, er
} }
// How long we wait for a connection to a backend in seconds // How long we wait for a connection to a backend in seconds
var endpointDialTimeout = []time.Duration{250 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second, 2 * time.Second} var EndpointDialTimeouts = []time.Duration{250 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second, 2 * time.Second}
// tcpProxySocket implements ProxySocket. Close() is implemented by net.Listener. When Close() is called, // tcpProxySocket implements ProxySocket. Close() is implemented by net.Listener. When Close() is called,
// no new connections are allowed but existing connections are left untouched. // no new connections are allowed but existing connections are left untouched.
@ -86,9 +86,11 @@ func (tcp *tcpProxySocket) ListenPort() int {
return tcp.port return tcp.port
} }
func tryConnect(service proxy.ServicePortName, srcAddr net.Addr, protocol string, loadBalancer LoadBalancer) (out net.Conn, err error) { // TryConnectEndpoints attempts to connect to the next available endpoint for the given service, cycling
// through until it is able to successully connect, or it has tried with all timeouts in EndpointDialTimeouts.
func TryConnectEndpoints(service proxy.ServicePortName, srcAddr net.Addr, protocol string, loadBalancer LoadBalancer) (out net.Conn, err error) {
sessionAffinityReset := false sessionAffinityReset := false
for _, dialTimeout := range endpointDialTimeout { for _, dialTimeout := range EndpointDialTimeouts {
endpoint, err := loadBalancer.NextEndpoint(service, srcAddr, sessionAffinityReset) endpoint, err := loadBalancer.NextEndpoint(service, srcAddr, sessionAffinityReset)
if err != nil { if err != nil {
glog.Errorf("Couldn't find an endpoint for %s: %v", service, err) glog.Errorf("Couldn't find an endpoint for %s: %v", service, err)
@ -135,19 +137,19 @@ func (tcp *tcpProxySocket) ProxyLoop(service proxy.ServicePortName, myInfo *Serv
continue continue
} }
glog.V(3).Infof("Accepted TCP connection from %v to %v", inConn.RemoteAddr(), inConn.LocalAddr()) glog.V(3).Infof("Accepted TCP connection from %v to %v", inConn.RemoteAddr(), inConn.LocalAddr())
outConn, err := tryConnect(service, inConn.(*net.TCPConn).RemoteAddr(), "tcp", loadBalancer) outConn, err := TryConnectEndpoints(service, inConn.(*net.TCPConn).RemoteAddr(), "tcp", loadBalancer)
if err != nil { if err != nil {
glog.Errorf("Failed to connect to balancer: %v", err) glog.Errorf("Failed to connect to balancer: %v", err)
inConn.Close() inConn.Close()
continue continue
} }
// Spin up an async copy loop. // Spin up an async copy loop.
go proxyTCP(inConn.(*net.TCPConn), outConn.(*net.TCPConn)) go ProxyTCP(inConn.(*net.TCPConn), outConn.(*net.TCPConn))
} }
} }
// proxyTCP proxies data bi-directionally between in and out. // ProxyTCP proxies data bi-directionally between in and out.
func proxyTCP(in, out *net.TCPConn) { func ProxyTCP(in, out *net.TCPConn) {
var wg sync.WaitGroup var wg sync.WaitGroup
wg.Add(2) wg.Add(2)
glog.V(4).Infof("Creating proxy between %v <-> %v <-> %v <-> %v", glog.V(4).Infof("Creating proxy between %v <-> %v <-> %v <-> %v",
@ -251,7 +253,7 @@ func (udp *udpProxySocket) getBackendConn(activeClients *ClientCache, cliAddr ne
// and keep accepting inbound traffic. // and keep accepting inbound traffic.
glog.V(3).Infof("New UDP connection from %s", cliAddr) glog.V(3).Infof("New UDP connection from %s", cliAddr)
var err error var err error
svrConn, err = tryConnect(service, cliAddr, "udp", loadBalancer) svrConn, err = TryConnectEndpoints(service, cliAddr, "udp", loadBalancer)
if err != nil { if err != nil {
return nil, err return nil, err
} }