[#11] dialer: Use source IPs intead of interfaces
The use of network interfaces does not cover cases where it is necessary to use network interfaces to access different subnets. Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
This commit is contained in:
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GPG key ID:
237AF1A763293BC0
16 changed files with 70 additions and 797 deletions
41
README.md
41
README.md
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@ -16,10 +16,32 @@ But sometimes you need to invent a bicycle.
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## Usage
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```golang
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import "git.frostfs.info/TrueCloudLab/multinet"
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import (
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"context"
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"net"
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"net/netip"
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"git.frostfs.info/TrueCloudLab/multinet"
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)
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import
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d, err := multinet.NewDialer(Config{
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Subnets: []string{"10.11.70.0/23", "192.168.123.0/24"},
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Subnets: []Subnet{
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{
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Prefix: netip.MustParsePrefix("10.11.70.0/23"),
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SourceIPs: []netip.Addr{
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netip.MustParseAddr("10.11.70.42"),
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netip.MustParseAddr("10.11.71.42"),
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},
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},
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{
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Prefix: netip.MustParsePrefix("192.168.123.0/24"),
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SourceIPs: []netip.Addr{
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netip.MustParseAddr("192.168.123.42"),
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netip.MustParseAddr("192.168.123.142"),
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},
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},
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},
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Balancer: multinet.BalancerTypeRoundRobin,
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})
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if err != nil {
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@ -32,18 +54,3 @@ if err != nil {
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}
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// do stuff
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```
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### Updating interface state
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`Multidialer` exposes `UpdateInterface()` method for updating state of a single link.
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`NetlinkWatcher` can wrap `Multidialer` type and perform all updates automatically.
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TODO: describe needed capabilities here.
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## Patch
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To perform refactoring (use `multinet.Dial` instead of `net.Dial`) using [gopatch](https://github.com/uber-go/gopatch):
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```bash
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gopatch -p ./multinet.patch <project directory>
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```
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20
balancer.go
20
balancer.go
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@ -32,14 +32,10 @@ type roundRobin struct {
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func (r *roundRobin) DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error) {
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next := int(r.i.Add(1))
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for i := range s.Interfaces {
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ii := s.Interfaces[(i+next)%len(s.Interfaces)]
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if ii.Down {
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continue
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}
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for i := range s.SourceIPs {
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ii := s.SourceIPs[(i+next)%len(s.SourceIPs)]
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dd := r.d.dialer
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dd.LocalAddr = ii.LocalAddr
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dd.LocalAddr = &net.TCPAddr{IP: net.IP(ii.AsSlice())}
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return r.d.dialContext(&dd, ctx, network, address)
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}
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return nil, fmt.Errorf("(*roundRobin).DialContext: %w", errNoSuitableNodeFound)
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@ -50,14 +46,10 @@ type firstEnabled struct {
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}
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func (r *firstEnabled) DialContext(ctx context.Context, s *Subnet, network, address string) (net.Conn, error) {
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for i := range s.Interfaces {
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ii := s.Interfaces[i%len(s.Interfaces)]
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if ii.Down {
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continue
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}
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for i := range s.SourceIPs {
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ii := s.SourceIPs[i]
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dd := r.d.dialer
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dd.LocalAddr = ii.LocalAddr
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dd.LocalAddr = &net.TCPAddr{IP: net.IP(ii.AsSlice())}
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return r.d.dialContext(&dd, ctx, network, address)
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}
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return nil, fmt.Errorf("(*firstEnabled).DialContext: %w", errNoSuitableNodeFound)
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31
default.go
31
default.go
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@ -1,31 +0,0 @@
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package multinet
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import (
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"context"
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"fmt"
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"net"
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)
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var (
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defaultDialer Multidialer
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defaultDialerErr error
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)
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func init() {
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var err error
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defaultDialer, err = NewDialer(Config{
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Balancer: BalancerTypeRoundRobin,
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Subnets: []string{"0.0.0.0/0", "::/0"},
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})
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if err != nil {
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defaultDialerErr = fmt.Errorf("failed to initialize default dialier: %w", err)
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}
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}
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// Dial dials provided network and address using default dialer.
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func Dial(network, address string) (net.Conn, error) {
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if defaultDialerErr != nil {
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return nil, defaultDialerErr
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}
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return defaultDialer.DialContext(context.Background(), network, address)
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}
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@ -1,29 +0,0 @@
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//go:build integration
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package multinet
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import (
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"fmt"
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"net/http"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestDefaultDialer(t *testing.T) {
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srv := startHTTP(t)
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defer require.NoError(t, srv.Close())
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conn, err := Dial("tcp", "localhost:8080")
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require.NoError(t, err)
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require.NoError(t, conn.Close())
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}
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func startHTTP(t *testing.T) *http.Server {
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srv := &http.Server{Addr: ":8080"}
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Test stub") })
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go func() {
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require.ErrorIs(t, srv.ListenAndServe(), http.ErrServerClosed)
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}()
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return srv
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}
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143
dialer.go
143
dialer.go
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@ -1,12 +1,10 @@
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package multinet
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import (
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"bytes"
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"context"
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"fmt"
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"net"
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"net/netip"
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"sort"
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"sync"
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"time"
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)
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@ -20,12 +18,6 @@ type Dialer interface {
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DialContext(ctx context.Context, network, address string) (net.Conn, error)
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}
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// Multidialer is like Dialer, but supports link state updates.
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type Multidialer interface {
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Dialer
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UpdateInterface(name string, addr netip.Addr, status bool)
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}
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var (
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_ Dialer = (*net.Dialer)(nil)
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_ Dialer = (*dialer)(nil)
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@ -49,23 +41,16 @@ type dialer struct {
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fallbackDelay time.Duration
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}
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// Subnet represents a single subnet, possibly routable from multiple interfaces.
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// Subnet represents a single subnet, possibly routable from multiple source IPs.
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type Subnet struct {
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Mask netip.Prefix
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Interfaces []Source
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}
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// Source represents a single source IP belonging to a particular subnet.
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type Source struct {
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Name string
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LocalAddr *net.TCPAddr
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Down bool
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Prefix netip.Prefix
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SourceIPs []netip.Addr
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}
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// Config contains Multidialer configuration.
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type Config struct {
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// Routable subnets to prioritize in CIDR format.
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Subnets []string
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// Routable subnets.
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Subnets []Subnet
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// If true, the only configurd subnets available through this dialer.
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// Otherwise, a failback to the net.DefaultDialer.
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Restrict bool
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@ -83,47 +68,15 @@ type Config struct {
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// If zero, a default delay of 300ms is used.
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// A negative value disables Fast Fallback support.
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FallbackDelay time.Duration
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// InterfaceSource is custom `Interface`` source.
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// If not specified, default implementation is used (`net.Interfaces()``).
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InterfaceSource func() ([]Interface, error)
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// DialContext is custom DialContext function.
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// If not specified, default implemenattion is used (`d.DialContext(ctx, network, address)`).
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DialContext func(d *net.Dialer, ctx context.Context, network, address string) (net.Conn, error)
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}
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// NewDialer ...
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func NewDialer(c Config) (Multidialer, error) {
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var ifaces []Interface
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var err error
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if c.InterfaceSource != nil {
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ifaces, err = c.InterfaceSource()
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} else {
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ifaces, err = systemInterfaces()
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}
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if err != nil {
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return nil, err
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}
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sort.Slice(ifaces, func(i, j int) bool {
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return ifaces[i].Name() < ifaces[j].Name()
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})
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var sources []iface
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for i := range ifaces {
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info, err := processIface(ifaces[i])
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if err != nil {
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return nil, err
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}
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sources = append(sources, info)
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}
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func NewDialer(c Config) (Dialer, error) {
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var d dialer
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for _, subnet := range c.Subnets {
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s, err := processSubnet(subnet, sources)
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if err != nil {
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return nil, err
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}
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d.subnets = append(d.subnets, s)
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}
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d.subnets = c.Subnets
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switch c.Balancer {
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case BalancerTypeNoop:
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@ -148,63 +101,6 @@ func NewDialer(c Config) (Multidialer, error) {
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return &d, nil
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}
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type iface struct {
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name string
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addrs []netip.Prefix
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down bool
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}
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func processIface(info Interface) (iface, error) {
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ips, err := info.Addrs()
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if err != nil {
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return iface{}, err
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}
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var addrs []netip.Prefix
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for i := range ips {
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p, err := netip.ParsePrefix(ips[i].String())
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if err != nil {
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return iface{}, err
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}
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addrs = append(addrs, p)
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}
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return iface{name: info.Name(), addrs: addrs, down: info.Down()}, nil
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}
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func processSubnet(subnet string, sources []iface) (Subnet, error) {
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s, err := netip.ParsePrefix(subnet)
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if err != nil {
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return Subnet{}, err
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}
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var ifs []Source
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for _, source := range sources {
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for i := range source.addrs {
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src := source.addrs[i].Addr()
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if s.Contains(src) {
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ifs = append(ifs, Source{
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Name: source.name,
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LocalAddr: &net.TCPAddr{IP: net.IP(src.AsSlice())},
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Down: source.down,
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})
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}
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}
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}
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sort.Slice(ifs, func(i, j int) bool {
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if ifs[i].Name != ifs[j].Name {
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return ifs[i].Name < ifs[j].Name
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}
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return bytes.Compare(ifs[i].LocalAddr.IP, ifs[j].LocalAddr.IP) == -1
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})
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return Subnet{
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Mask: s,
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Interfaces: ifs,
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}, nil
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}
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// DialContext implements the Dialer interface.
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// Hostnames for address are currently not supported.
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func (d *dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
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@ -371,7 +267,7 @@ func (d *dialer) dialAddr(ctx context.Context, network, address string, addr net
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defer d.mtx.RUnlock()
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for i := range d.subnets {
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if d.subnets[i].Mask.Contains(addr.Addr()) {
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if d.subnets[i].Prefix.Contains(addr.Addr()) {
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return d.balancer.DialContext(ctx, &d.subnets[i], network, address)
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}
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}
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@ -389,29 +285,6 @@ func (d *dialer) dialContext(nd *net.Dialer, ctx context.Context, network, addre
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return nd.DialContext(ctx, network, address)
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}
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// UpdateInterface implements the Multidialer interface.
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// Updating address on a specific interface is currently not supported.
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func (d *dialer) UpdateInterface(iface string, addr netip.Addr, up bool) {
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d.mtx.Lock()
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defer d.mtx.Unlock()
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for i := range d.subnets {
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for j := range d.subnets[i].Interfaces {
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matchIface := d.subnets[i].Interfaces[j].Name == iface
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if matchIface {
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d.subnets[i].Interfaces[j].Down = !up
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continue
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}
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a, _ := netip.AddrFromSlice(d.subnets[i].Interfaces[j].LocalAddr.IP)
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matchAddr := a.IsUnspecified() || addr == a
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if matchAddr {
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d.subnets[i].Interfaces[j].Down = !up
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}
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}
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}
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}
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// splitByType divides an address list into two categories:
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// the first address, and any with same type, are returned as
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// primaries, while addresses with the opposite type are returned
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@ -3,6 +3,7 @@ package multinet
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import (
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"context"
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"net"
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"net/netip"
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"testing"
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"time"
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@ -14,8 +15,15 @@ func TestHostnameResolveIPv4(t *testing.T) {
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resolvedAddr := "10.11.12.180:8080"
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resolved := false
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d, err := NewDialer(Config{
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Subnets: []string{"10.11.12.0/24"},
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InterfaceSource: testInterfacesV4,
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Subnets: []Subnet{
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{
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Prefix: netip.MustParsePrefix("10.11.12.0/24"),
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SourceIPs: []netip.Addr{
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netip.MustParseAddr("10.11.12.101"),
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netip.MustParseAddr("10.11.12.102"),
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},
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},
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},
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DialContext: func(d *net.Dialer, ctx context.Context, network, address string) (net.Conn, error) {
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if resolvedAddr == address {
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resolved = true
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@ -42,8 +50,15 @@ func TestHostnameResolveIPv6(t *testing.T) {
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ipv6 := net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:8195")
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resolved := false
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d, err := NewDialer(Config{
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Subnets: []string{"2001:db8:85a3:8d3::/64"},
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InterfaceSource: testInterfacesV6,
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Subnets: []Subnet{
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{
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Prefix: netip.MustParsePrefix("2001:db8:85a3:8d3::/64"),
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SourceIPs: []netip.Addr{
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netip.MustParseAddr("2001:db8:85a3:8d3:1319:8a2e:370:7348"),
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netip.MustParseAddr("2001:db8:85a3:8d3:1319:8a2e:370:8192"),
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},
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},
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},
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DialContext: func(d *net.Dialer, ctx context.Context, network, address string) (net.Conn, error) {
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if resolvedAddr == address {
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resolved = true
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@ -65,70 +80,6 @@ func TestHostnameResolveIPv6(t *testing.T) {
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require.True(t, resolved)
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}
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func testInterfacesV4() ([]Interface, error) {
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return []Interface{
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&testInterface{
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name: "data1",
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addrs: []net.Addr{
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&testAddr{
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network: "tcp",
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str: "10.11.12.101/24",
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},
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},
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},
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&testInterface{
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name: "data2",
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addrs: []net.Addr{
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&testAddr{
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network: "tcp",
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str: "10.11.12.102/24",
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},
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},
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},
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}, nil
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}
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func testInterfacesV6() ([]Interface, error) {
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return []Interface{
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&testInterface{
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name: "data1",
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addrs: []net.Addr{
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&testAddr{
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network: "tcp",
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str: "2001:db8:85a3:8d3:1319:8a2e:370:7348/64",
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},
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},
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},
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&testInterface{
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name: "data2",
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addrs: []net.Addr{
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&testAddr{
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network: "tcp",
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str: "2001:db8:85a3:8d3:1319:8a2e:370:8192/64",
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},
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},
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},
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}, nil
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}
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type testInterface struct {
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name string
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addrs []net.Addr
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down bool
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}
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func (i *testInterface) Name() string { return i.name }
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func (i *testInterface) Addrs() ([]net.Addr, error) { return i.addrs, nil }
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func (i *testInterface) Down() bool { return i.down }
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type testAddr struct {
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network string
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str string
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}
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func (a *testAddr) Network() string { return a.network }
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func (a *testAddr) String() string { return a.str }
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type testDnsConn struct {
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wantName string
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ipv4 []byte
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|
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@ -1,166 +0,0 @@
|
|||
//go:build integration
|
||||
|
||||
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)
|
||||
})
|
||||
}
|
||||
|
|
@ -2,17 +2,20 @@ package multinet
|
|||
|
||||
import (
|
||||
"context"
|
||||
"net"
|
||||
"net/netip"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
func TestInterfacesDown(t *testing.T) {
|
||||
func TestNoSourceIPs(t *testing.T) {
|
||||
t.Run("noop balancer", func(t *testing.T) {
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"10.11.12.0/24"},
|
||||
InterfaceSource: testDownInterfaces,
|
||||
Subnets: []Subnet{
|
||||
{
|
||||
Prefix: netip.MustParsePrefix("10.11.12.0/24"),
|
||||
},
|
||||
},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
conn, err := d.DialContext(context.Background(), "tcp", "10.11.12.254:8080")
|
||||
|
|
@ -21,9 +24,12 @@ func TestInterfacesDown(t *testing.T) {
|
|||
})
|
||||
t.Run("round robin balancer", func(t *testing.T) {
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"10.11.12.0/24"},
|
||||
InterfaceSource: testDownInterfaces,
|
||||
Balancer: BalancerTypeRoundRobin,
|
||||
Subnets: []Subnet{
|
||||
{
|
||||
Prefix: netip.MustParsePrefix("10.11.12.0/24"),
|
||||
},
|
||||
},
|
||||
Balancer: BalancerTypeRoundRobin,
|
||||
})
|
||||
require.NoError(t, err)
|
||||
conn, err := d.DialContext(context.Background(), "tcp", "10.11.12.254:8080")
|
||||
|
|
@ -31,28 +37,3 @@ func TestInterfacesDown(t *testing.T) {
|
|||
require.Nil(t, conn)
|
||||
})
|
||||
}
|
||||
|
||||
func testDownInterfaces() ([]Interface, error) {
|
||||
return []Interface{
|
||||
&testInterface{
|
||||
name: "data1",
|
||||
addrs: []net.Addr{
|
||||
&testAddr{
|
||||
network: "tcp",
|
||||
str: "10.11.12.101/24",
|
||||
},
|
||||
},
|
||||
down: true,
|
||||
},
|
||||
&testInterface{
|
||||
name: "data2",
|
||||
addrs: []net.Addr{
|
||||
&testAddr{
|
||||
network: "tcp",
|
||||
str: "10.11.12.102/24",
|
||||
},
|
||||
},
|
||||
down: true,
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
|
|
|
|||
3
go.mod
3
go.mod
|
|
@ -4,10 +4,7 @@ go 1.20
|
|||
|
||||
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/net v0.17.0
|
||||
golang.org/x/sys v0.13.0
|
||||
)
|
||||
|
||||
require (
|
||||
|
|
|
|||
BIN
go.sum
BIN
go.sum
Binary file not shown.
67
health.go
67
health.go
|
|
@ -1,67 +0,0 @@
|
|||
package multinet
|
||||
|
||||
import (
|
||||
"net/netip"
|
||||
"sync"
|
||||
|
||||
"github.com/vishvananda/netlink"
|
||||
"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 {
|
||||
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()
|
||||
return nil
|
||||
}
|
||||
|
||||
func (w *NetlinkWatcher) watch() {
|
||||
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()
|
||||
}
|
||||
|
|
@ -1,157 +0,0 @@
|
|||
//go:build integration
|
||||
|
||||
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}}
|
||||
|
||||
result := make(chan net.Addr, 1)
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
DialContext: func(d *net.Dialer, _ context.Context, _, _ string) (net.Conn, error) {
|
||||
result <- d.LocalAddr
|
||||
return nil, nil
|
||||
},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
|
||||
w := NewNetlinkWatcher(d)
|
||||
require.NoError(t, w.Start())
|
||||
t.Cleanup(w.Stop)
|
||||
|
||||
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}}
|
||||
|
||||
result := make(chan net.Addr, 1)
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
DialContext: func(d *net.Dialer, _ context.Context, _, _ string) (net.Conn, error) {
|
||||
result <- d.LocalAddr
|
||||
return nil, nil
|
||||
},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
|
||||
w := NewNetlinkWatcher(d)
|
||||
require.NoError(t, w.Start())
|
||||
t.Cleanup(w.Stop)
|
||||
|
||||
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}}
|
||||
|
||||
result := make(chan net.Addr, 1)
|
||||
d, err := NewDialer(Config{
|
||||
Subnets: []string{"1.2.30.0/23"},
|
||||
Balancer: BalancerTypeRoundRobin,
|
||||
DialContext: func(d *net.Dialer, _ context.Context, _, _ string) (net.Conn, error) {
|
||||
result <- d.LocalAddr
|
||||
return nil, nil
|
||||
},
|
||||
})
|
||||
require.NoError(t, err)
|
||||
|
||||
w := NewNetlinkWatcher(d)
|
||||
require.NoError(t, w.Start())
|
||||
t.Cleanup(w.Stop)
|
||||
|
||||
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")
|
||||
}
|
||||
}
|
||||
38
interface.go
38
interface.go
|
|
@ -1,38 +0,0 @@
|
|||
package multinet
|
||||
|
||||
import "net"
|
||||
|
||||
// Interface provides information about net.Interface.
|
||||
type Interface interface {
|
||||
Name() string
|
||||
Addrs() ([]net.Addr, error)
|
||||
Down() bool
|
||||
}
|
||||
|
||||
type netInterface struct {
|
||||
iface net.Interface
|
||||
}
|
||||
|
||||
func (i *netInterface) Name() string {
|
||||
return i.iface.Name
|
||||
}
|
||||
|
||||
func (i *netInterface) Addrs() ([]net.Addr, error) {
|
||||
return i.iface.Addrs()
|
||||
}
|
||||
|
||||
func (i *netInterface) Down() bool {
|
||||
return i.iface.Flags&net.FlagUp == 0
|
||||
}
|
||||
|
||||
func systemInterfaces() ([]Interface, error) {
|
||||
ifaces, err := net.Interfaces()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
var result []Interface
|
||||
for _, iface := range ifaces {
|
||||
result = append(result, &netInterface{iface: iface})
|
||||
}
|
||||
return result, nil
|
||||
}
|
||||
|
|
@ -1,7 +0,0 @@
|
|||
@@
|
||||
@@
|
||||
+import "git.frostfs.info/TrueCloudLab/multinet"
|
||||
-import "net"
|
||||
|
||||
-net.Dial(...)
|
||||
+multinet.Dial(...)
|
||||
19
testdata/patch_0.go
vendored
19
testdata/patch_0.go
vendored
|
|
@ -1,19 +0,0 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net"
|
||||
)
|
||||
|
||||
const addr = "s01.frostfs.devenv:8080"
|
||||
|
||||
func main() {
|
||||
_, err := net.Dial(getNetwork(), addr)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func getNetwork() string {
|
||||
return "tcp"
|
||||
}
|
||||
14
testdata/patch_1.go
vendored
14
testdata/patch_1.go
vendored
|
|
@ -1,14 +0,0 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net"
|
||||
)
|
||||
|
||||
func main() {
|
||||
ip := net.IPv4(192, 168, 0, 10)
|
||||
_, err := net.Dial("tcp", ip.String()+":8080")
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue