Initial commit
Signed-off-by: Evgenii Stratonikov <stratonikov@runbox.com>
This commit is contained in:
commit
b92dae991b
9 changed files with 735 additions and 0 deletions
3
Makefile
Normal file
3
Makefile
Normal file
|
|
@ -0,0 +1,3 @@
|
|||
test:
|
||||
# TODO figure out needed capabilities
|
||||
sudo go test -count=1 -v ./...
|
||||
41
README.md
Normal file
41
README.md
Normal file
|
|
@ -0,0 +1,41 @@
|
|||
# Source-based routing in Golang
|
||||
|
||||
|
||||
Consider this routing table:
|
||||
```
|
||||
10.11.70.0/23 dev data0 proto kernel scope link src 10.11.70.42
|
||||
10.11.70.0/23 dev data1 proto kernel scope link src 10.11.71.42
|
||||
192.168.123.0/24 dev internal0 proto kernel scope link src 192.168.123.42
|
||||
192.168.123.0/24 dev internal1 proto kernel scope link src 192.168.123.142
|
||||
```
|
||||
|
||||
Simple `net.Dial` to either `10.11.70.42` or `10.11.71.42` will match the first subnet and be routed via data0.
|
||||
This problems is usually solved by bonds.
|
||||
But sometimes you need to invent a bicycle.
|
||||
|
||||
## Usage
|
||||
|
||||
```golang
|
||||
import "git.frostfs.info/TrueCloudLab/multinet"
|
||||
|
||||
d, err := multinet.NewDialer(Config{
|
||||
Subnets: []string{"10.11.70.0/23", "192.168.123.0/24"},
|
||||
Balancer: multinet.BalancerTypeRoundRobin,
|
||||
})
|
||||
if err != nil {
|
||||
// handle error
|
||||
}
|
||||
|
||||
conn, err := d.DialContext(ctx, "tcp", "10.11.70.42")
|
||||
if err != nil {
|
||||
// handle error
|
||||
}
|
||||
// do stuff
|
||||
```
|
||||
|
||||
### Updating interface state
|
||||
|
||||
`Multidialer` exposes `UpdateInterface()` method for updating state of a single link.
|
||||
`NetlinkWatcher` can wrap `Multidialer` type and perform all updates automatically.
|
||||
|
||||
TODO: describe needed capabilities here.
|
||||
61
balancer.go
Normal file
61
balancer.go
Normal file
|
|
@ -0,0 +1,61 @@
|
|||
package multinet
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"net"
|
||||
"sync/atomic"
|
||||
)
|
||||
|
||||
// BalancerType reperents the algorithm which is used to pick source address.
|
||||
type BalancerType string
|
||||
|
||||
const (
|
||||
// BalancerTypeNoop picks first address for which link is up.
|
||||
BalancerTypeNoop BalancerType = ""
|
||||
// BalancerTypeNoop implements simple round-robin between up links.
|
||||
// It is not fair in case some links are down.
|
||||
BalancerTypeRoundRobin BalancerType = "roundrobin"
|
||||
)
|
||||
|
||||
type balancer interface {
|
||||
DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error)
|
||||
}
|
||||
|
||||
type roundRobin struct {
|
||||
d *dialer
|
||||
i atomic.Uint32
|
||||
}
|
||||
|
||||
func (r *roundRobin) DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error) {
|
||||
next := int(r.i.Add(1))
|
||||
for i := range s.Interfaces {
|
||||
ii := s.Interfaces[(i+next)%len(s.Interfaces)]
|
||||
if ii.Down {
|
||||
continue
|
||||
}
|
||||
|
||||
dd := r.d.dialer
|
||||
dd.LocalAddr = ii.LocalAddr
|
||||
return r.d.dialContext(&dd, ctx, "tcp", address)
|
||||
}
|
||||
return nil, errors.New("(*roundRobin).DialContext: no suitale node found")
|
||||
}
|
||||
|
||||
type firstEnabled struct {
|
||||
d *dialer
|
||||
}
|
||||
|
||||
func (r *firstEnabled) DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error) {
|
||||
for i := range s.Interfaces {
|
||||
ii := s.Interfaces[i%len(s.Interfaces)]
|
||||
if ii.Down {
|
||||
continue
|
||||
}
|
||||
|
||||
dd := r.d.dialer
|
||||
dd.LocalAddr = ii.LocalAddr
|
||||
return r.d.dialContext(&dd, ctx, "tcp", address)
|
||||
}
|
||||
return nil, errors.New("(*firstEnabled).DialContext: no suitale node found")
|
||||
}
|
||||
219
dialer.go
Normal file
219
dialer.go
Normal file
|
|
@ -0,0 +1,219 @@
|
|||
package multinet
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"fmt"
|
||||
"net"
|
||||
"net/netip"
|
||||
"sort"
|
||||
"sync"
|
||||
)
|
||||
|
||||
// Dialer contains the single most important method from the net.Dialer.
|
||||
type Dialer interface {
|
||||
DialContext(ctx context.Context, network, address string) (net.Conn, error)
|
||||
}
|
||||
|
||||
// Multidialer is like Dialer, but supports link state updates.
|
||||
type Multidialer interface {
|
||||
Dialer
|
||||
UpdateInterface(name string, addr netip.Addr, status bool) error
|
||||
}
|
||||
|
||||
var (
|
||||
_ Dialer = (*net.Dialer)(nil)
|
||||
_ Dialer = (*dialer)(nil)
|
||||
)
|
||||
|
||||
type dialer struct {
|
||||
// Protects subnets field (recursively).
|
||||
mtx sync.RWMutex
|
||||
subnets []Subnet
|
||||
// Default options for the net.Dialer.
|
||||
dialer net.Dialer
|
||||
// If true, allow to dial only configured subnets.
|
||||
restrict bool
|
||||
// Algorithm to which picks source address for each ip.
|
||||
balancer balancer
|
||||
// Hook used in tests, overrides `net.Dialer.DialContext()`
|
||||
testHookDialContext func(d *net.Dialer, ctx context.Context, network, address string) (net.Conn, error)
|
||||
}
|
||||
|
||||
// Subnet represents a single subnet, possibly routable from multiple interfaces.
|
||||
type Subnet struct {
|
||||
Mask netip.Prefix
|
||||
Interfaces []Source
|
||||
}
|
||||
|
||||
// Source represents a single source IP belonging to a particular subnet.
|
||||
type Source struct {
|
||||
Name string
|
||||
LocalAddr *net.TCPAddr
|
||||
Down bool
|
||||
}
|
||||
|
||||
// Config contains Multidialer configuration.
|
||||
type Config struct {
|
||||
// Routable subnets to prioritize in CIDR format.
|
||||
Subnets []string
|
||||
// If true, the only configurd subnets available through this dialer.
|
||||
// Otherwise, a failback to the net.DefaultDialer.
|
||||
Restrict bool
|
||||
// Dialer containes default options for the net.Dialer to use.
|
||||
// LocalAddr is overriden.
|
||||
Dialer net.Dialer
|
||||
// Balancer specifies algorithm used to pick source address.
|
||||
Balancer BalancerType
|
||||
}
|
||||
|
||||
// NewDialer ...
|
||||
func NewDialer(c Config) (Multidialer, error) {
|
||||
ifaces, err := net.Interfaces()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
sort.Slice(ifaces, func(i, j int) bool {
|
||||
return ifaces[i].Name < ifaces[j].Name
|
||||
})
|
||||
|
||||
var sources []iface
|
||||
for i := range ifaces {
|
||||
info, err := processIface(ifaces[i])
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
sources = append(sources, info)
|
||||
}
|
||||
|
||||
var d dialer
|
||||
for _, subnet := range c.Subnets {
|
||||
s, err := processSubnet(subnet, sources)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
d.subnets = append(d.subnets, s)
|
||||
}
|
||||
|
||||
switch c.Balancer {
|
||||
case BalancerTypeNoop:
|
||||
d.balancer = &firstEnabled{d: &d}
|
||||
case BalancerTypeRoundRobin:
|
||||
d.balancer = &roundRobin{d: &d}
|
||||
default:
|
||||
return nil, fmt.Errorf("invalid balancer type: %s", c.Balancer)
|
||||
}
|
||||
|
||||
d.restrict = c.Restrict
|
||||
|
||||
return &d, nil
|
||||
}
|
||||
|
||||
type iface struct {
|
||||
info net.Interface
|
||||
addrs []netip.Prefix
|
||||
}
|
||||
|
||||
func processIface(info net.Interface) (iface, error) {
|
||||
ips, err := info.Addrs()
|
||||
if err != nil {
|
||||
return iface{}, err
|
||||
}
|
||||
|
||||
var addrs []netip.Prefix
|
||||
for i := range ips {
|
||||
p, err := netip.ParsePrefix(ips[i].String())
|
||||
if err != nil {
|
||||
return iface{}, err
|
||||
}
|
||||
|
||||
addrs = append(addrs, p)
|
||||
}
|
||||
return iface{info: info, addrs: addrs}, nil
|
||||
}
|
||||
|
||||
func processSubnet(subnet string, sources []iface) (Subnet, error) {
|
||||
s, err := netip.ParsePrefix(subnet)
|
||||
if err != nil {
|
||||
return Subnet{}, err
|
||||
}
|
||||
|
||||
var ifs []Source
|
||||
for _, source := range sources {
|
||||
for i := range source.addrs {
|
||||
src := source.addrs[i].Addr()
|
||||
if s.Contains(src) {
|
||||
ifs = append(ifs, Source{
|
||||
Name: source.info.Name,
|
||||
LocalAddr: &net.TCPAddr{IP: net.IP(src.AsSlice())},
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
sort.Slice(ifs, func(i, j int) bool {
|
||||
if ifs[i].Name != ifs[j].Name {
|
||||
return ifs[i].Name < ifs[j].Name
|
||||
}
|
||||
return bytes.Compare(ifs[i].LocalAddr.IP, ifs[j].LocalAddr.IP) == -1
|
||||
})
|
||||
|
||||
return Subnet{
|
||||
Mask: s,
|
||||
Interfaces: ifs,
|
||||
}, nil
|
||||
}
|
||||
|
||||
// DialContext implements the Dialer interface.
|
||||
// Hostnames for address are currently not supported.
|
||||
func (d *dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
|
||||
addr, err := netip.ParseAddrPort(address)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
d.mtx.RLock()
|
||||
defer d.mtx.RUnlock()
|
||||
|
||||
for i := range d.subnets {
|
||||
if d.subnets[i].Mask.Contains(addr.Addr()) {
|
||||
return d.balancer.DialContext(ctx, &d.subnets[i], network, address)
|
||||
}
|
||||
}
|
||||
|
||||
if d.restrict {
|
||||
return nil, fmt.Errorf("no suitable interface for: [%s]%s", network, address)
|
||||
}
|
||||
return d.dialer.DialContext(ctx, network, address)
|
||||
}
|
||||
|
||||
func (d *dialer) dialContext(nd *net.Dialer, ctx context.Context, network, address string) (net.Conn, error) {
|
||||
if h := d.testHookDialContext; h != nil {
|
||||
return h(nd, ctx, "tcp", address)
|
||||
}
|
||||
return nd.DialContext(ctx, "tcp", address)
|
||||
}
|
||||
|
||||
// UpdateInterface implements the Multidialer interface.
|
||||
// Updating address on a specific interface is currently not supported.
|
||||
func (d *dialer) UpdateInterface(iface string, addr netip.Addr, up bool) error {
|
||||
d.mtx.Lock()
|
||||
defer d.mtx.Unlock()
|
||||
|
||||
for i := range d.subnets {
|
||||
for j := range d.subnets[i].Interfaces {
|
||||
matchIface := d.subnets[i].Interfaces[j].Name == iface
|
||||
if matchIface {
|
||||
d.subnets[i].Interfaces[j].Down = !up
|
||||
continue
|
||||
}
|
||||
|
||||
a, _ := netip.AddrFromSlice(d.subnets[i].Interfaces[j].LocalAddr.IP)
|
||||
matchAddr := a.IsUnspecified() || addr == a
|
||||
if matchAddr {
|
||||
d.subnets[i].Interfaces[j].Down = !up
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
164
dialer_test.go
Normal file
164
dialer_test.go
Normal file
|
|
@ -0,0 +1,164 @@
|
|||
package multinet
|
||||
|
||||
import (
|
||||
"net"
|
||||
"net/netip"
|
||||
"runtime"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
"github.com/vishvananda/netlink"
|
||||
"github.com/vishvananda/netns"
|
||||
)
|
||||
|
||||
func TestDialer(t *testing.T) {
|
||||
runInNewNamespace(t, "2 interfaces with multiple routes in different subnets", func(t *testing.T, ns netns.NsHandle) {
|
||||
setup(t, map[string][]string{
|
||||
"testdev1": {"1.2.30.10/23", "4.4.4.4/8"},
|
||||
"testdev2": {"1.2.30.11/23", "4.4.4.5/8"},
|
||||
})
|
||||
|
||||
// Do not use `t.Run` because everything should be executed in a single OS thread.
|
||||
|
||||
{ // Restrict to a single subnet.
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, []Subnet{
|
||||
{
|
||||
Mask: netip.MustParsePrefix("1.2.30.0/23"),
|
||||
Interfaces: []Source{
|
||||
{Name: "testdev1", LocalAddr: &net.TCPAddr{IP: net.IP{1, 2, 30, 10}}},
|
||||
{Name: "testdev2", LocalAddr: &net.TCPAddr{IP: net.IP{1, 2, 30, 11}}},
|
||||
},
|
||||
},
|
||||
}, d.(*dialer).subnets)
|
||||
}
|
||||
|
||||
{ // Restrict to two subnets.
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23", "4.0.0.0/8"},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, []Subnet{
|
||||
{
|
||||
Mask: netip.MustParsePrefix("1.2.30.0/23"),
|
||||
Interfaces: []Source{
|
||||
{Name: "testdev1", LocalAddr: &net.TCPAddr{IP: net.IP{1, 2, 30, 10}}},
|
||||
{Name: "testdev2", LocalAddr: &net.TCPAddr{IP: net.IP{1, 2, 30, 11}}},
|
||||
},
|
||||
},
|
||||
{
|
||||
Mask: netip.MustParsePrefix("4.0.0.0/8"),
|
||||
Interfaces: []Source{
|
||||
{Name: "testdev1", LocalAddr: &net.TCPAddr{IP: net.IP{4, 4, 4, 4}}},
|
||||
{Name: "testdev2", LocalAddr: &net.TCPAddr{IP: net.IP{4, 4, 4, 5}}},
|
||||
},
|
||||
},
|
||||
}, d.(*dialer).subnets)
|
||||
}
|
||||
})
|
||||
runInNewNamespace(t, "4 interfaces, 2 for data, 2 internal", func(t *testing.T, ns netns.NsHandle) {
|
||||
setup(t, map[string][]string{
|
||||
"internal1": {"192.168.0.1/16"},
|
||||
"internal2": {"192.168.0.2/16"},
|
||||
"data1": {"10.11.12.101/24"},
|
||||
"data2": {"10.11.12.102/24"},
|
||||
})
|
||||
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"10.11.12.0/24", "192.168.0.0/16"},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, []Subnet{
|
||||
{
|
||||
Mask: netip.MustParsePrefix("10.11.12.0/24"),
|
||||
Interfaces: []Source{
|
||||
{Name: "data1", LocalAddr: &net.TCPAddr{IP: net.IP{10, 11, 12, 101}}},
|
||||
{Name: "data2", LocalAddr: &net.TCPAddr{IP: net.IP{10, 11, 12, 102}}},
|
||||
},
|
||||
},
|
||||
{
|
||||
Mask: netip.MustParsePrefix("192.168.0.0/16"),
|
||||
Interfaces: []Source{
|
||||
{Name: "internal1", LocalAddr: &net.TCPAddr{IP: net.IP{192, 168, 0, 1}}},
|
||||
{Name: "internal2", LocalAddr: &net.TCPAddr{IP: net.IP{192, 168, 0, 2}}},
|
||||
},
|
||||
},
|
||||
}, d.(*dialer).subnets)
|
||||
})
|
||||
runInNewNamespace(t, "with ipv6", func(t *testing.T, ns netns.NsHandle) {
|
||||
addr1 := "2001:db8:85a3:8d3:1319:8a2e:370:7348/64"
|
||||
addr2 := "2001:db8:85a3:8d3:1319:8a2e:370:8192/64"
|
||||
setup(t, map[string][]string{
|
||||
"testdev1": {addr1},
|
||||
"testdev2": {addr2},
|
||||
})
|
||||
|
||||
// Do not use `t.Run` because everything should be executed in a single OS thread.
|
||||
|
||||
{ // Restrict to a single subnet.
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"2001:db8:85a3:8d3::/64"},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, []Subnet{
|
||||
{
|
||||
Mask: netip.MustParsePrefix("2001:db8:85a3:8d3::/64"),
|
||||
Interfaces: []Source{
|
||||
{Name: "testdev1", LocalAddr: mustParseIPv6(t, addr1)},
|
||||
{Name: "testdev2", LocalAddr: mustParseIPv6(t, addr2)},
|
||||
},
|
||||
},
|
||||
}, d.(*dialer).subnets)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
func mustParseIPv6(t *testing.T, s string) *net.TCPAddr {
|
||||
ip, _, err := net.ParseCIDR(s)
|
||||
require.NoError(t, err)
|
||||
return &net.TCPAddr{IP: ip}
|
||||
}
|
||||
|
||||
func setup(t *testing.T, config map[string][]string) {
|
||||
for name, ips := range config {
|
||||
link := createLink(t, name)
|
||||
for i := range ips {
|
||||
ip, err := netlink.ParseIPNet(ips[i])
|
||||
require.NoError(t, err)
|
||||
require.NoError(t, netlink.AddrAdd(link, &netlink.Addr{IPNet: ip}))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func createLink(t *testing.T, name string) netlink.Link {
|
||||
require.NoError(t, netlink.LinkAdd(&netlink.Dummy{LinkAttrs: netlink.LinkAttrs{Name: name}}))
|
||||
|
||||
link, err := netlink.LinkByName(name)
|
||||
require.NoError(t, err)
|
||||
require.NoError(t, netlink.LinkSetUp(link))
|
||||
return link
|
||||
}
|
||||
|
||||
func runInNewNamespace(t *testing.T, name string, f func(t *testing.T, ns netns.NsHandle)) {
|
||||
t.Run(name, func(t *testing.T) {
|
||||
// To avoid messing with host network settings,
|
||||
// we create a new names space and execute tests in it.
|
||||
// Switching thread can move us to a different namespace, thus this line.
|
||||
runtime.LockOSThread()
|
||||
defer runtime.UnlockOSThread()
|
||||
|
||||
origns, err := netns.Get()
|
||||
require.NoError(t, err)
|
||||
defer origns.Close()
|
||||
defer netns.Set(origns)
|
||||
|
||||
newns, err := netns.New()
|
||||
require.NoError(t, err)
|
||||
defer newns.Close()
|
||||
|
||||
f(t, newns)
|
||||
})
|
||||
}
|
||||
16
go.mod
Normal file
16
go.mod
Normal file
|
|
@ -0,0 +1,16 @@
|
|||
module git.frostfs.info/TrueCloudLab/multinet
|
||||
|
||||
go 1.21.0
|
||||
|
||||
require (
|
||||
github.com/stretchr/testify v1.8.4
|
||||
github.com/vishvananda/netlink v1.1.0
|
||||
github.com/vishvananda/netns v0.0.4
|
||||
golang.org/x/sys v0.2.0
|
||||
)
|
||||
|
||||
require (
|
||||
github.com/davecgh/go-spew v1.1.1 // indirect
|
||||
github.com/pmezard/go-difflib v1.0.0 // indirect
|
||||
gopkg.in/yaml.v3 v3.0.1 // indirect
|
||||
)
|
||||
BIN
go.sum
Normal file
BIN
go.sum
Normal file
Binary file not shown.
73
health.go
Normal file
73
health.go
Normal file
|
|
@ -0,0 +1,73 @@
|
|||
package multinet
|
||||
|
||||
import (
|
||||
"net/netip"
|
||||
"sync"
|
||||
|
||||
"github.com/vishvananda/netlink"
|
||||
"github.com/vishvananda/netns"
|
||||
"golang.org/x/sys/unix"
|
||||
)
|
||||
|
||||
type NetlinkWatcher struct {
|
||||
d Multidialer
|
||||
linkUpdates chan netlink.LinkUpdate
|
||||
addrUpdates chan netlink.AddrUpdate
|
||||
done chan struct{}
|
||||
wg sync.WaitGroup
|
||||
}
|
||||
|
||||
func NewNetlinkWatcher(d Multidialer) *NetlinkWatcher {
|
||||
return &NetlinkWatcher{
|
||||
d: d,
|
||||
addrUpdates: make(chan netlink.AddrUpdate, 1),
|
||||
linkUpdates: make(chan netlink.LinkUpdate, 1),
|
||||
done: make(chan struct{}),
|
||||
}
|
||||
}
|
||||
|
||||
func (w *NetlinkWatcher) Start() error {
|
||||
ns, err := netns.Get()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if err := netlink.LinkSubscribe(w.linkUpdates, w.done); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := netlink.AddrSubscribe(w.addrUpdates, w.done); err != nil {
|
||||
close(w.done)
|
||||
return err
|
||||
}
|
||||
|
||||
w.wg.Add(1)
|
||||
go w.watch(ns)
|
||||
return nil
|
||||
}
|
||||
|
||||
func (w *NetlinkWatcher) watch(ns netns.NsHandle) {
|
||||
defer w.wg.Done()
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-w.done:
|
||||
return
|
||||
case update := <-w.addrUpdates:
|
||||
// Wont work if an multiple interfaces share IP address.
|
||||
// Should not happen in practice.
|
||||
ip, ok := netip.AddrFromSlice(update.LinkAddress.IP)
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
w.d.UpdateInterface("", ip, update.NewAddr)
|
||||
case update := <-w.linkUpdates:
|
||||
up := update.Flags&unix.IFF_UP != 0
|
||||
w.d.UpdateInterface(update.Link.Attrs().Name, netip.Addr{}, up)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (w *NetlinkWatcher) Stop() {
|
||||
close(w.done)
|
||||
w.wg.Wait()
|
||||
}
|
||||
158
health_test.go
Normal file
158
health_test.go
Normal file
|
|
@ -0,0 +1,158 @@
|
|||
package multinet
|
||||
|
||||
import (
|
||||
"context"
|
||||
"net"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
"github.com/vishvananda/netlink"
|
||||
"github.com/vishvananda/netns"
|
||||
)
|
||||
|
||||
func Test_NetlinkWatcher(t *testing.T) {
|
||||
runInNewNamespace(t, "noop balancer, disable interface", func(t *testing.T, ns netns.NsHandle) {
|
||||
setup(t, map[string][]string{
|
||||
"testdev1": {"1.2.30.11/23"},
|
||||
"testdev2": {"1.2.30.12/23"},
|
||||
})
|
||||
|
||||
addr1 := &net.TCPAddr{IP: net.IP{1, 2, 30, 11}}
|
||||
addr2 := &net.TCPAddr{IP: net.IP{1, 2, 30, 12}}
|
||||
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
|
||||
w := NewNetlinkWatcher(d)
|
||||
require.NoError(t, w.Start())
|
||||
t.Cleanup(w.Stop)
|
||||
|
||||
result := make(chan net.Addr, 1)
|
||||
d.(*dialer).testHookDialContext = func(d *net.Dialer, _ context.Context, _, _ string) (net.Conn, error) {
|
||||
result <- d.LocalAddr
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
|
||||
link, err := netlink.LinkByName("testdev1")
|
||||
require.NoError(t, err)
|
||||
require.NoError(t, netlink.LinkSetDown(link))
|
||||
time.Sleep(time.Second)
|
||||
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
|
||||
require.NoError(t, netlink.LinkSetUp(link))
|
||||
time.Sleep(time.Second)
|
||||
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
})
|
||||
|
||||
runInNewNamespace(t, "noop balancer, remove address", func(t *testing.T, ns netns.NsHandle) {
|
||||
setup(t, map[string][]string{
|
||||
"testdev1": {"1.2.30.11/23"},
|
||||
"testdev2": {"1.2.30.12/23"},
|
||||
})
|
||||
|
||||
addr1 := &net.TCPAddr{IP: net.IP{1, 2, 30, 11}}
|
||||
addr2 := &net.TCPAddr{IP: net.IP{1, 2, 30, 12}}
|
||||
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
|
||||
w := NewNetlinkWatcher(d)
|
||||
require.NoError(t, w.Start())
|
||||
t.Cleanup(w.Stop)
|
||||
|
||||
result := make(chan net.Addr, 1)
|
||||
d.(*dialer).testHookDialContext = func(d *net.Dialer, _ context.Context, _, _ string) (net.Conn, error) {
|
||||
result <- d.LocalAddr
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
|
||||
link, err := netlink.LinkByName("testdev1")
|
||||
require.NoError(t, err)
|
||||
|
||||
ip, err := netlink.ParseIPNet("1.2.30.11/23")
|
||||
require.NoError(t, err)
|
||||
require.NoError(t, netlink.AddrDel(link, &netlink.Addr{IPNet: ip}))
|
||||
time.Sleep(time.Second)
|
||||
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
|
||||
require.NoError(t, netlink.AddrAdd(link, &netlink.Addr{IPNet: ip}))
|
||||
time.Sleep(time.Second)
|
||||
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
})
|
||||
|
||||
runInNewNamespace(t, "round-robin balancer, disable interface", func(t *testing.T, ns netns.NsHandle) {
|
||||
setup(t, map[string][]string{
|
||||
"testdev1": {"1.2.30.11/23"},
|
||||
"testdev2": {"1.2.30.12/23"},
|
||||
})
|
||||
|
||||
addr1 := &net.TCPAddr{IP: net.IP{1, 2, 30, 11}}
|
||||
addr2 := &net.TCPAddr{IP: net.IP{1, 2, 30, 12}}
|
||||
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
Balancer: BalancerTypeRoundRobin,
|
||||
})
|
||||
require.NoError(t, err)
|
||||
|
||||
w := NewNetlinkWatcher(d)
|
||||
require.NoError(t, w.Start())
|
||||
t.Cleanup(w.Stop)
|
||||
|
||||
result := make(chan net.Addr, 1)
|
||||
d.(*dialer).testHookDialContext = func(d *net.Dialer, _ context.Context, _, _ string) (net.Conn, error) {
|
||||
result <- d.LocalAddr
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
|
||||
link, err := netlink.LinkByName("testdev1")
|
||||
require.NoError(t, err)
|
||||
require.NoError(t, netlink.LinkSetDown(link))
|
||||
time.Sleep(time.Second)
|
||||
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
|
||||
require.NoError(t, netlink.LinkSetUp(link))
|
||||
time.Sleep(time.Second)
|
||||
|
||||
checkDialAddr(t, d, result, addr1)
|
||||
checkDialAddr(t, d, result, addr2)
|
||||
})
|
||||
}
|
||||
|
||||
func checkDialAddr(t *testing.T, d Multidialer, ch chan net.Addr, expected net.Addr) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
|
||||
defer cancel()
|
||||
|
||||
_, err := d.DialContext(ctx, "tcp", "1.2.30.42:12345")
|
||||
require.NoError(t, err)
|
||||
|
||||
select {
|
||||
case addr := <-ch:
|
||||
require.Equal(t, expected, addr)
|
||||
default:
|
||||
require.Fail(t, "DialContext() was not called")
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue