Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/BUILD

@@ -0,0 +1,55 @@
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_binary",
+    "go_library",
+    "go_test",
+    "cgo_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "loadbalancer.go",
+        "port_allocator.go",
+        "proxier.go",
+        "proxysocket.go",
+        "roundrobin.go",
+        "udp_server.go",
+    ],
+    tags = ["automanaged"],
+    deps = [
+        "//pkg/api:go_default_library",
+        "//pkg/proxy:go_default_library",
+        "//pkg/types:go_default_library",
+        "//pkg/util/errors:go_default_library",
+        "//pkg/util/net:go_default_library",
+        "//pkg/util/netsh:go_default_library",
+        "//pkg/util/runtime:go_default_library",
+        "//pkg/util/slice:go_default_library",
+        "//pkg/util/wait:go_default_library",
+        "//vendor:github.com/golang/glog",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "port_allocator_test.go",
+        "proxier_test.go",
+        "roundrobin_test.go",
+    ],
+    library = "go_default_library",
+    tags = ["automanaged"],
+    deps = [
+        "//pkg/api:go_default_library",
+        "//pkg/proxy:go_default_library",
+        "//pkg/types:go_default_library",
+        "//pkg/util/net:go_default_library",
+        "//pkg/util/netsh/testing:go_default_library",
+        "//pkg/util/runtime:go_default_library",
+    ],
+)

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/loadbalancer.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2016 The Kubernetes 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 winuserspace
+
+import (
+	"net"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/proxy"
+)
+
+// LoadBalancer is an interface for distributing incoming requests to service endpoints.
+type LoadBalancer interface {
+	// NextEndpoint returns the endpoint to handle a request for the given
+	// service-port and source address.
+	NextEndpoint(service proxy.ServicePortName, srcAddr net.Addr, sessionAffinityReset bool) (string, error)
+	NewService(service proxy.ServicePortName, sessionAffinityType api.ServiceAffinity, stickyMaxAgeMinutes int) error
+	DeleteService(service proxy.ServicePortName)
+	CleanupStaleStickySessions(service proxy.ServicePortName)
+}

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/port_allocator.go

@@ -0,0 +1,153 @@
+/*
+Copyright 2016 The Kubernetes 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 winuserspace
+
+import (
+	"errors"
+	"math/big"
+	"math/rand"
+	"sync"
+	"time"
+
+	"k8s.io/kubernetes/pkg/util/net"
+	"k8s.io/kubernetes/pkg/util/wait"
+)
+
+var (
+	errPortRangeNoPortsRemaining = errors.New("port allocation failed; there are no remaining ports left to allocate in the accepted range")
+)
+
+type PortAllocator interface {
+	AllocateNext() (int, error)
+	Release(int)
+}
+
+// randomAllocator is a PortAllocator implementation that allocates random ports, yielding
+// a port value of 0 for every call to AllocateNext().
+type randomAllocator struct{}
+
+// AllocateNext always returns 0
+func (r *randomAllocator) AllocateNext() (int, error) {
+	return 0, nil
+}
+
+// Release is a noop
+func (r *randomAllocator) Release(_ int) {
+	// noop
+}
+
+// newPortAllocator builds PortAllocator for a given PortRange. If the PortRange is empty
+// then a random port allocator is returned; otherwise, a new range-based allocator
+// is returned.
+func newPortAllocator(r net.PortRange) PortAllocator {
+	if r.Base == 0 {
+		return &randomAllocator{}
+	}
+	return newPortRangeAllocator(r)
+}
+
+const (
+	portsBufSize         = 16
+	nextFreePortCooldown = 500 * time.Millisecond
+	allocateNextTimeout  = 1 * time.Second
+)
+
+type rangeAllocator struct {
+	net.PortRange
+	ports chan int
+	used  big.Int
+	lock  sync.Mutex
+	rand  *rand.Rand
+}
+
+func newPortRangeAllocator(r net.PortRange) PortAllocator {
+	if r.Base == 0 || r.Size == 0 {
+		panic("illegal argument: may not specify an empty port range")
+	}
+	ra := &rangeAllocator{
+		PortRange: r,
+		ports:     make(chan int, portsBufSize),
+		rand:      rand.New(rand.NewSource(time.Now().UnixNano())),
+	}
+	go wait.Until(func() { ra.fillPorts(wait.NeverStop) }, nextFreePortCooldown, wait.NeverStop)
+	return ra
+}
+
+// fillPorts loops, always searching for the next free port and, if found, fills the ports buffer with it.
+// this func blocks until either there are no remaining free ports, or else the stopCh chan is closed.
+func (r *rangeAllocator) fillPorts(stopCh <-chan struct{}) {
+	for {
+		port := r.nextFreePort()
+		if port == -1 {
+			return
+		}
+		select {
+		case <-stopCh:
+			return
+		case r.ports <- port:
+		}
+	}
+}
+
+// nextFreePort finds a free port, first picking a random port. if that port is already in use
+// then the port range is scanned sequentially until either a port is found or the scan completes
+// unsuccessfully. an unsuccessful scan returns a port of -1.
+func (r *rangeAllocator) nextFreePort() int {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+
+	// choose random port
+	j := r.rand.Intn(r.Size)
+	if b := r.used.Bit(j); b == 0 {
+		r.used.SetBit(&r.used, j, 1)
+		return j + r.Base
+	}
+
+	// search sequentially
+	for i := j + 1; i < r.Size; i++ {
+		if b := r.used.Bit(i); b == 0 {
+			r.used.SetBit(&r.used, i, 1)
+			return i + r.Base
+		}
+	}
+	for i := 0; i < j; i++ {
+		if b := r.used.Bit(i); b == 0 {
+			r.used.SetBit(&r.used, i, 1)
+			return i + r.Base
+		}
+	}
+	return -1
+}
+
+func (r *rangeAllocator) AllocateNext() (port int, err error) {
+	select {
+	case port = <-r.ports:
+	case <-time.After(allocateNextTimeout):
+		err = errPortRangeNoPortsRemaining
+	}
+	return
+}
+
+func (r *rangeAllocator) Release(port int) {
+	port -= r.Base
+	if port < 0 || port >= r.Size {
+		return
+	}
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	r.used.SetBit(&r.used, port, 0)
+}

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/port_allocator_test.go

@@ -0,0 +1,101 @@
+/*
+Copyright 2016 The Kubernetes 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 winuserspace
+
+import (
+	"reflect"
+	"testing"
+
+	"k8s.io/kubernetes/pkg/util/net"
+)
+
+func TestRangeAllocatorEmpty(t *testing.T) {
+	r := &net.PortRange{}
+	r.Set("0-0")
+	defer func() {
+		if rv := recover(); rv == nil {
+			t.Fatalf("expected panic because of empty port range: %#v", r)
+		}
+	}()
+	_ = newPortRangeAllocator(*r)
+}
+
+func TestRangeAllocatorFullyAllocated(t *testing.T) {
+	r := &net.PortRange{}
+	r.Set("1-1")
+	a := newPortRangeAllocator(*r)
+	p, err := a.AllocateNext()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if p != 1 {
+		t.Fatalf("unexpected allocated port: %d", p)
+	}
+
+	_, err = a.AllocateNext()
+	if err == nil {
+		t.Fatalf("expected error because of fully-allocated range")
+	}
+
+	a.Release(p)
+	p, err = a.AllocateNext()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if p != 1 {
+		t.Fatalf("unexpected allocated port: %d", p)
+	}
+
+	_, err = a.AllocateNext()
+	if err == nil {
+		t.Fatalf("expected error because of fully-allocated range")
+	}
+}
+
+func TestRangeAllocator_RandomishAllocation(t *testing.T) {
+	r := &net.PortRange{}
+	r.Set("1-100")
+	a := newPortRangeAllocator(*r)
+
+	// allocate all the ports
+	var err error
+	ports := make([]int, 100, 100)
+	for i := 0; i < 100; i++ {
+		ports[i], err = a.AllocateNext()
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	}
+
+	// release them all
+	for i := 0; i < 100; i++ {
+		a.Release(ports[i])
+	}
+
+	// allocate the ports again
+	rports := make([]int, 100, 100)
+	for i := 0; i < 100; i++ {
+		rports[i], err = a.AllocateNext()
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	}
+
+	if reflect.DeepEqual(ports, rports) {
+		t.Fatalf("expected re-allocated ports to be in a somewhat random order")
+	}
+}

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/proxysocket.go

@@ -0,0 +1,300 @@
+/*
+Copyright 2016 The Kubernetes 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 winuserspace
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/proxy"
+	"k8s.io/kubernetes/pkg/util/runtime"
+)
+
+// Abstraction over TCP/UDP sockets which are proxied.
+type proxySocket interface {
+	// Addr gets the net.Addr for a proxySocket.
+	Addr() net.Addr
+	// Close stops the proxySocket from accepting incoming connections.
+	// Each implementation should comment on the impact of calling Close
+	// while sessions are active.
+	Close() error
+	// ProxyLoop proxies incoming connections for the specified service to the service endpoints.
+	ProxyLoop(service proxy.ServicePortName, info *serviceInfo, proxier *Proxier)
+	// ListenPort returns the host port that the proxySocket is listening on
+	ListenPort() int
+}
+
+func newProxySocket(protocol api.Protocol, ip net.IP, port int) (proxySocket, error) {
+	host := ""
+	if ip != nil {
+		host = ip.String()
+	}
+
+	switch strings.ToUpper(string(protocol)) {
+	case "TCP":
+		listener, err := net.Listen("tcp", net.JoinHostPort(host, strconv.Itoa(port)))
+		if err != nil {
+			return nil, err
+		}
+		return &tcpProxySocket{Listener: listener, port: port}, nil
+	case "UDP":
+		addr, err := net.ResolveUDPAddr("udp", net.JoinHostPort(host, strconv.Itoa(port)))
+		if err != nil {
+			return nil, err
+		}
+		conn, err := net.ListenUDP("udp", addr)
+		if err != nil {
+			return nil, err
+		}
+		return &udpProxySocket{UDPConn: conn, port: port}, nil
+	}
+	return nil, fmt.Errorf("unknown protocol %q", protocol)
+}
+
+// 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}
+
+// tcpProxySocket implements proxySocket.  Close() is implemented by net.Listener.  When Close() is called,
+// no new connections are allowed but existing connections are left untouched.
+type tcpProxySocket struct {
+	net.Listener
+	port int
+}
+
+func (tcp *tcpProxySocket) ListenPort() int {
+	return tcp.port
+}
+
+func tryConnect(service proxy.ServicePortName, srcAddr net.Addr, protocol string, proxier *Proxier) (out net.Conn, err error) {
+	sessionAffinityReset := false
+	for _, dialTimeout := range endpointDialTimeout {
+		endpoint, err := proxier.loadBalancer.NextEndpoint(service, srcAddr, sessionAffinityReset)
+		if err != nil {
+			glog.Errorf("Couldn't find an endpoint for %s: %v", service, err)
+			return nil, err
+		}
+		glog.V(3).Infof("Mapped service %q to endpoint %s", service, endpoint)
+		// TODO: This could spin up a new goroutine to make the outbound connection,
+		// and keep accepting inbound traffic.
+		outConn, err := net.DialTimeout(protocol, endpoint, dialTimeout)
+		if err != nil {
+			if isTooManyFDsError(err) {
+				panic("Dial failed: " + err.Error())
+			}
+			glog.Errorf("Dial failed: %v", err)
+			sessionAffinityReset = true
+			continue
+		}
+		return outConn, nil
+	}
+	return nil, fmt.Errorf("failed to connect to an endpoint.")
+}
+
+func (tcp *tcpProxySocket) ProxyLoop(service proxy.ServicePortName, myInfo *serviceInfo, proxier *Proxier) {
+	for {
+		if !myInfo.isAlive() {
+			// The service port was closed or replaced.
+			return
+		}
+		// Block until a connection is made.
+		inConn, err := tcp.Accept()
+		if err != nil {
+			if isTooManyFDsError(err) {
+				panic("Accept failed: " + err.Error())
+			}
+
+			if isClosedError(err) {
+				return
+			}
+			if !myInfo.isAlive() {
+				// Then the service port was just closed so the accept failure is to be expected.
+				return
+			}
+			glog.Errorf("Accept failed: %v", err)
+			continue
+		}
+		glog.V(3).Infof("Accepted TCP connection from %v to %v", inConn.RemoteAddr(), inConn.LocalAddr())
+		outConn, err := tryConnect(service, inConn.(*net.TCPConn).RemoteAddr(), "tcp", proxier)
+		if err != nil {
+			glog.Errorf("Failed to connect to balancer: %v", err)
+			inConn.Close()
+			continue
+		}
+		// Spin up an async copy loop.
+		go proxyTCP(inConn.(*net.TCPConn), outConn.(*net.TCPConn))
+	}
+}
+
+// proxyTCP proxies data bi-directionally between in and out.
+func proxyTCP(in, out *net.TCPConn) {
+	var wg sync.WaitGroup
+	wg.Add(2)
+	glog.V(4).Infof("Creating proxy between %v <-> %v <-> %v <-> %v",
+		in.RemoteAddr(), in.LocalAddr(), out.LocalAddr(), out.RemoteAddr())
+	go copyBytes("from backend", in, out, &wg)
+	go copyBytes("to backend", out, in, &wg)
+	wg.Wait()
+}
+
+func copyBytes(direction string, dest, src *net.TCPConn, wg *sync.WaitGroup) {
+	defer wg.Done()
+	glog.V(4).Infof("Copying %s: %s -> %s", direction, src.RemoteAddr(), dest.RemoteAddr())
+	n, err := io.Copy(dest, src)
+	if err != nil {
+		if !isClosedError(err) {
+			glog.Errorf("I/O error: %v", err)
+		}
+	}
+	glog.V(4).Infof("Copied %d bytes %s: %s -> %s", n, direction, src.RemoteAddr(), dest.RemoteAddr())
+	dest.Close()
+	src.Close()
+}
+
+// udpProxySocket implements proxySocket.  Close() is implemented by net.UDPConn.  When Close() is called,
+// no new connections are allowed and existing connections are broken.
+// TODO: We could lame-duck this ourselves, if it becomes important.
+type udpProxySocket struct {
+	*net.UDPConn
+	port int
+}
+
+func (udp *udpProxySocket) ListenPort() int {
+	return udp.port
+}
+
+func (udp *udpProxySocket) Addr() net.Addr {
+	return udp.LocalAddr()
+}
+
+// Holds all the known UDP clients that have not timed out.
+type clientCache struct {
+	mu      sync.Mutex
+	clients map[string]net.Conn // addr string -> connection
+}
+
+func newClientCache() *clientCache {
+	return &clientCache{clients: map[string]net.Conn{}}
+}
+
+func (udp *udpProxySocket) ProxyLoop(service proxy.ServicePortName, myInfo *serviceInfo, proxier *Proxier) {
+	var buffer [4096]byte // 4KiB should be enough for most whole-packets
+	for {
+		if !myInfo.isAlive() {
+			// The service port was closed or replaced.
+			break
+		}
+
+		// Block until data arrives.
+		// TODO: Accumulate a histogram of n or something, to fine tune the buffer size.
+		n, cliAddr, err := udp.ReadFrom(buffer[0:])
+		if err != nil {
+			if e, ok := err.(net.Error); ok {
+				if e.Temporary() {
+					glog.V(1).Infof("ReadFrom had a temporary failure: %v", err)
+					continue
+				}
+			}
+			glog.Errorf("ReadFrom failed, exiting ProxyLoop: %v", err)
+			break
+		}
+		// If this is a client we know already, reuse the connection and goroutine.
+		svrConn, err := udp.getBackendConn(myInfo.activeClients, cliAddr, proxier, service, myInfo.timeout)
+		if err != nil {
+			continue
+		}
+		// TODO: It would be nice to let the goroutine handle this write, but we don't
+		// really want to copy the buffer.  We could do a pool of buffers or something.
+		_, err = svrConn.Write(buffer[0:n])
+		if err != nil {
+			if !logTimeout(err) {
+				glog.Errorf("Write failed: %v", err)
+				// TODO: Maybe tear down the goroutine for this client/server pair?
+			}
+			continue
+		}
+		err = svrConn.SetDeadline(time.Now().Add(myInfo.timeout))
+		if err != nil {
+			glog.Errorf("SetDeadline failed: %v", err)
+			continue
+		}
+	}
+}
+
+func (udp *udpProxySocket) getBackendConn(activeClients *clientCache, cliAddr net.Addr, proxier *Proxier, service proxy.ServicePortName, timeout time.Duration) (net.Conn, error) {
+	activeClients.mu.Lock()
+	defer activeClients.mu.Unlock()
+
+	svrConn, found := activeClients.clients[cliAddr.String()]
+	if !found {
+		// TODO: This could spin up a new goroutine to make the outbound connection,
+		// and keep accepting inbound traffic.
+		glog.V(3).Infof("New UDP connection from %s", cliAddr)
+		var err error
+		svrConn, err = tryConnect(service, cliAddr, "udp", proxier)
+		if err != nil {
+			return nil, err
+		}
+		if err = svrConn.SetDeadline(time.Now().Add(timeout)); err != nil {
+			glog.Errorf("SetDeadline failed: %v", err)
+			return nil, err
+		}
+		activeClients.clients[cliAddr.String()] = svrConn
+		go func(cliAddr net.Addr, svrConn net.Conn, activeClients *clientCache, timeout time.Duration) {
+			defer runtime.HandleCrash()
+			udp.proxyClient(cliAddr, svrConn, activeClients, timeout)
+		}(cliAddr, svrConn, activeClients, timeout)
+	}
+	return svrConn, nil
+}
+
+// This function is expected to be called as a goroutine.
+// TODO: Track and log bytes copied, like TCP
+func (udp *udpProxySocket) proxyClient(cliAddr net.Addr, svrConn net.Conn, activeClients *clientCache, timeout time.Duration) {
+	defer svrConn.Close()
+	var buffer [4096]byte
+	for {
+		n, err := svrConn.Read(buffer[0:])
+		if err != nil {
+			if !logTimeout(err) {
+				glog.Errorf("Read failed: %v", err)
+			}
+			break
+		}
+		err = svrConn.SetDeadline(time.Now().Add(timeout))
+		if err != nil {
+			glog.Errorf("SetDeadline failed: %v", err)
+			break
+		}
+		n, err = udp.WriteTo(buffer[0:n], cliAddr)
+		if err != nil {
+			if !logTimeout(err) {
+				glog.Errorf("WriteTo failed: %v", err)
+			}
+			break
+		}
+	}
+	activeClients.mu.Lock()
+	delete(activeClients.clients, cliAddr.String())
+	activeClients.mu.Unlock()
+}

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/roundrobin.go

@@ -0,0 +1,326 @@
+/*
+Copyright 2016 The Kubernetes 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 winuserspace
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"reflect"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/proxy"
+	"k8s.io/kubernetes/pkg/types"
+	"k8s.io/kubernetes/pkg/util/slice"
+)
+
+var (
+	ErrMissingServiceEntry = errors.New("missing service entry")
+	ErrMissingEndpoints    = errors.New("missing endpoints")
+)
+
+type affinityState struct {
+	clientIP string
+	//clientProtocol  api.Protocol //not yet used
+	//sessionCookie   string       //not yet used
+	endpoint string
+	lastUsed time.Time
+}
+
+type affinityPolicy struct {
+	affinityType api.ServiceAffinity
+	affinityMap  map[string]*affinityState // map client IP -> affinity info
+	ttlMinutes   int
+}
+
+// LoadBalancerRR is a round-robin load balancer.
+type LoadBalancerRR struct {
+	lock     sync.RWMutex
+	services map[proxy.ServicePortName]*balancerState
+}
+
+// Ensure this implements LoadBalancer.
+var _ LoadBalancer = &LoadBalancerRR{}
+
+type balancerState struct {
+	endpoints []string // a list of "ip:port" style strings
+	index     int      // current index into endpoints
+	affinity  affinityPolicy
+}
+
+func newAffinityPolicy(affinityType api.ServiceAffinity, ttlMinutes int) *affinityPolicy {
+	return &affinityPolicy{
+		affinityType: affinityType,
+		affinityMap:  make(map[string]*affinityState),
+		ttlMinutes:   ttlMinutes,
+	}
+}
+
+// NewLoadBalancerRR returns a new LoadBalancerRR.
+func NewLoadBalancerRR() *LoadBalancerRR {
+	return &LoadBalancerRR{
+		services: map[proxy.ServicePortName]*balancerState{},
+	}
+}
+
+func (lb *LoadBalancerRR) NewService(svcPort proxy.ServicePortName, affinityType api.ServiceAffinity, ttlMinutes int) error {
+	glog.V(4).Infof("LoadBalancerRR NewService %q", svcPort)
+	lb.lock.Lock()
+	defer lb.lock.Unlock()
+	lb.newServiceInternal(svcPort, affinityType, ttlMinutes)
+	return nil
+}
+
+// This assumes that lb.lock is already held.
+func (lb *LoadBalancerRR) newServiceInternal(svcPort proxy.ServicePortName, affinityType api.ServiceAffinity, ttlMinutes int) *balancerState {
+	if ttlMinutes == 0 {
+		ttlMinutes = 180 //default to 3 hours if not specified.  Should 0 be unlimited instead????
+	}
+
+	if _, exists := lb.services[svcPort]; !exists {
+		lb.services[svcPort] = &balancerState{affinity: *newAffinityPolicy(affinityType, ttlMinutes)}
+		glog.V(4).Infof("LoadBalancerRR service %q did not exist, created", svcPort)
+	} else if affinityType != "" {
+		lb.services[svcPort].affinity.affinityType = affinityType
+	}
+	return lb.services[svcPort]
+}
+
+func (lb *LoadBalancerRR) DeleteService(svcPort proxy.ServicePortName) {
+	glog.V(4).Infof("LoadBalancerRR DeleteService %q", svcPort)
+	lb.lock.Lock()
+	defer lb.lock.Unlock()
+	delete(lb.services, svcPort)
+}
+
+// return true if this service is using some form of session affinity.
+func isSessionAffinity(affinity *affinityPolicy) bool {
+	// Should never be empty string, but checking for it to be safe.
+	if affinity.affinityType == "" || affinity.affinityType == api.ServiceAffinityNone {
+		return false
+	}
+	return true
+}
+
+// NextEndpoint returns a service endpoint.
+// The service endpoint is chosen using the round-robin algorithm.
+func (lb *LoadBalancerRR) NextEndpoint(svcPort proxy.ServicePortName, srcAddr net.Addr, sessionAffinityReset bool) (string, error) {
+	// Coarse locking is simple.  We can get more fine-grained if/when we
+	// can prove it matters.
+	lb.lock.Lock()
+	defer lb.lock.Unlock()
+
+	state, exists := lb.services[svcPort]
+	if !exists || state == nil {
+		return "", ErrMissingServiceEntry
+	}
+	if len(state.endpoints) == 0 {
+		return "", ErrMissingEndpoints
+	}
+	glog.V(4).Infof("NextEndpoint for service %q, srcAddr=%v: endpoints: %+v", svcPort, srcAddr, state.endpoints)
+
+	sessionAffinityEnabled := isSessionAffinity(&state.affinity)
+
+	var ipaddr string
+	if sessionAffinityEnabled {
+		// Caution: don't shadow ipaddr
+		var err error
+		ipaddr, _, err = net.SplitHostPort(srcAddr.String())
+		if err != nil {
+			return "", fmt.Errorf("malformed source address %q: %v", srcAddr.String(), err)
+		}
+		if !sessionAffinityReset {
+			sessionAffinity, exists := state.affinity.affinityMap[ipaddr]
+			if exists && int(time.Now().Sub(sessionAffinity.lastUsed).Minutes()) < state.affinity.ttlMinutes {
+				// Affinity wins.
+				endpoint := sessionAffinity.endpoint
+				sessionAffinity.lastUsed = time.Now()
+				glog.V(4).Infof("NextEndpoint for service %q from IP %s with sessionAffinity %#v: %s", svcPort, ipaddr, sessionAffinity, endpoint)
+				return endpoint, nil
+			}
+		}
+	}
+	// Take the next endpoint.
+	endpoint := state.endpoints[state.index]
+	state.index = (state.index + 1) % len(state.endpoints)
+
+	if sessionAffinityEnabled {
+		var affinity *affinityState
+		affinity = state.affinity.affinityMap[ipaddr]
+		if affinity == nil {
+			affinity = new(affinityState) //&affinityState{ipaddr, "TCP", "", endpoint, time.Now()}
+			state.affinity.affinityMap[ipaddr] = affinity
+		}
+		affinity.lastUsed = time.Now()
+		affinity.endpoint = endpoint
+		affinity.clientIP = ipaddr
+		glog.V(4).Infof("Updated affinity key %s: %#v", ipaddr, state.affinity.affinityMap[ipaddr])
+	}
+
+	return endpoint, nil
+}
+
+type hostPortPair struct {
+	host string
+	port int
+}
+
+func isValidEndpoint(hpp *hostPortPair) bool {
+	return hpp.host != "" && hpp.port > 0
+}
+
+func flattenValidEndpoints(endpoints []hostPortPair) []string {
+	// Convert Endpoint objects into strings for easier use later.  Ignore
+	// the protocol field - we'll get that from the Service objects.
+	var result []string
+	for i := range endpoints {
+		hpp := &endpoints[i]
+		if isValidEndpoint(hpp) {
+			result = append(result, net.JoinHostPort(hpp.host, strconv.Itoa(hpp.port)))
+		}
+	}
+	return result
+}
+
+// Remove any session affinity records associated to a particular endpoint (for example when a pod goes down).
+func removeSessionAffinityByEndpoint(state *balancerState, svcPort proxy.ServicePortName, endpoint string) {
+	for _, affinity := range state.affinity.affinityMap {
+		if affinity.endpoint == endpoint {
+			glog.V(4).Infof("Removing client: %s from affinityMap for service %q", affinity.endpoint, svcPort)
+			delete(state.affinity.affinityMap, affinity.clientIP)
+		}
+	}
+}
+
+// Loop through the valid endpoints and then the endpoints associated with the Load Balancer.
+// Then remove any session affinity records that are not in both lists.
+// This assumes the lb.lock is held.
+func (lb *LoadBalancerRR) updateAffinityMap(svcPort proxy.ServicePortName, newEndpoints []string) {
+	allEndpoints := map[string]int{}
+	for _, newEndpoint := range newEndpoints {
+		allEndpoints[newEndpoint] = 1
+	}
+	state, exists := lb.services[svcPort]
+	if !exists {
+		return
+	}
+	for _, existingEndpoint := range state.endpoints {
+		allEndpoints[existingEndpoint] = allEndpoints[existingEndpoint] + 1
+	}
+	for mKey, mVal := range allEndpoints {
+		if mVal == 1 {
+			glog.V(2).Infof("Delete endpoint %s for service %q", mKey, svcPort)
+			removeSessionAffinityByEndpoint(state, svcPort, mKey)
+		}
+	}
+}
+
+// OnEndpointsUpdate manages the registered service endpoints.
+// Registered endpoints are updated if found in the update set or
+// unregistered if missing from the update set.
+func (lb *LoadBalancerRR) OnEndpointsUpdate(allEndpoints []api.Endpoints) {
+	registeredEndpoints := make(map[proxy.ServicePortName]bool)
+	lb.lock.Lock()
+	defer lb.lock.Unlock()
+
+	// Update endpoints for services.
+	for i := range allEndpoints {
+		svcEndpoints := &allEndpoints[i]
+
+		// We need to build a map of portname -> all ip:ports for that
+		// portname.  Explode Endpoints.Subsets[*] into this structure.
+		portsToEndpoints := map[string][]hostPortPair{}
+		for i := range svcEndpoints.Subsets {
+			ss := &svcEndpoints.Subsets[i]
+			for i := range ss.Ports {
+				port := &ss.Ports[i]
+				for i := range ss.Addresses {
+					addr := &ss.Addresses[i]
+					portsToEndpoints[port.Name] = append(portsToEndpoints[port.Name], hostPortPair{addr.IP, int(port.Port)})
+					// Ignore the protocol field - we'll get that from the Service objects.
+				}
+			}
+		}
+
+		for portname := range portsToEndpoints {
+			svcPort := proxy.ServicePortName{NamespacedName: types.NamespacedName{Namespace: svcEndpoints.Namespace, Name: svcEndpoints.Name}, Port: portname}
+			state, exists := lb.services[svcPort]
+			curEndpoints := []string{}
+			if state != nil {
+				curEndpoints = state.endpoints
+			}
+			newEndpoints := flattenValidEndpoints(portsToEndpoints[portname])
+
+			if !exists || state == nil || len(curEndpoints) != len(newEndpoints) || !slicesEquiv(slice.CopyStrings(curEndpoints), newEndpoints) {
+				glog.V(1).Infof("LoadBalancerRR: Setting endpoints for %s to %+v", svcPort, newEndpoints)
+				lb.updateAffinityMap(svcPort, newEndpoints)
+				// OnEndpointsUpdate can be called without NewService being called externally.
+				// To be safe we will call it here.  A new service will only be created
+				// if one does not already exist.  The affinity will be updated
+				// later, once NewService is called.
+				state = lb.newServiceInternal(svcPort, api.ServiceAffinity(""), 0)
+				state.endpoints = slice.ShuffleStrings(newEndpoints)
+
+				// Reset the round-robin index.
+				state.index = 0
+			}
+			registeredEndpoints[svcPort] = true
+		}
+	}
+	// Remove endpoints missing from the update.
+	for k := range lb.services {
+		if _, exists := registeredEndpoints[k]; !exists {
+			glog.V(2).Infof("LoadBalancerRR: Removing endpoints for %s", k)
+			// Reset but don't delete.
+			state := lb.services[k]
+			state.endpoints = []string{}
+			state.index = 0
+			state.affinity.affinityMap = map[string]*affinityState{}
+		}
+	}
+}
+
+// Tests whether two slices are equivalent.  This sorts both slices in-place.
+func slicesEquiv(lhs, rhs []string) bool {
+	if len(lhs) != len(rhs) {
+		return false
+	}
+	if reflect.DeepEqual(slice.SortStrings(lhs), slice.SortStrings(rhs)) {
+		return true
+	}
+	return false
+}
+
+func (lb *LoadBalancerRR) CleanupStaleStickySessions(svcPort proxy.ServicePortName) {
+	lb.lock.Lock()
+	defer lb.lock.Unlock()
+
+	state, exists := lb.services[svcPort]
+	if !exists {
+		return
+	}
+	for ip, affinity := range state.affinity.affinityMap {
+		if int(time.Now().Sub(affinity.lastUsed).Minutes()) >= state.affinity.ttlMinutes {
+			glog.V(4).Infof("Removing client %s from affinityMap for service %q", affinity.clientIP, svcPort)
+			delete(state.affinity.affinityMap, ip)
+		}
+	}
+}

vendor/k8s.io/kubernetes/pkg/proxy/winuserspace/udp_server.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2016 The Kubernetes 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 winuserspace
+
+import (
+	"fmt"
+	"net"
+)
+
+// udpEchoServer is a simple echo server in UDP, intended for testing the proxy.
+type udpEchoServer struct {
+	net.PacketConn
+}
+
+func (r *udpEchoServer) Loop() {
+	var buffer [4096]byte
+	for {
+		n, cliAddr, err := r.ReadFrom(buffer[0:])
+		if err != nil {
+			fmt.Printf("ReadFrom failed: %v\n", err)
+			continue
+		}
+		r.WriteTo(buffer[0:n], cliAddr)
+	}
+}
+
+func newUDPEchoServer() (*udpEchoServer, error) {
+	packetconn, err := net.ListenPacket("udp", ":0")
+	if err != nil {
+		return nil, err
+	}
+	return &udpEchoServer{packetconn}, nil
+}