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natlab: add NodeAgentClient

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This adds a new NodeAgentClient type that can be used to
invoke the LocalAPI using the LocalClient instead of
handcrafted URLs. However, there are certain cases where
it does make sense for the node agent to provide more
functionality than whats possible with just the LocalClient,
as such it also exposes a http.Client to make requests directly.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
dependabot/go_modules/github.com/docker/docker-26.1.5incompatible
Maisem Ali 3 months ago committed by Maisem Ali
parent 1016aa045f
commit 12764e9db4
4 changed files with 56 additions and 101 deletions
Show Stats Download Patch File Download Diff File

2
cmd/tta/tta.go
Unescape Escape View File

@ -65,6 +65,8 @@ type localClientRoundTripper struct {
}
func (rt localClientRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
req = req.Clone(req.Context())
req.RequestURI = ""
return rt.lc.DoLocalRequest(req)
}

4
cmd/vnet/vnet-main.go
Unescape Escape View File

@ -68,12 +68,12 @@ func main() {
}
s.WriteStartingBanner(os.Stdout)
nc := s.NodeAgentClient(node1)
go func() {
getStatus := func() {
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
st, err := s.NodeStatus(ctx, node1)
st, err := nc.Status(ctx)
if err != nil {
log.Printf("NodeStatus: %v", err)
return

111
tstest/integration/nat/nat_test.go
Unescape Escape View File

@ -5,23 +5,23 @@ package nat
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/netip"
"net/url"
"os"
"os/exec"
"path/filepath"
"strings"
"sync"
"testing"
"time"
"golang.org/x/sync/errgroup"
"tailscale.com/client/tailscale"
"tailscale.com/ipn/ipnstate"
"tailscale.com/tailcfg"
"tailscale.com/tstest/natlab/vnet"
)
@ -36,7 +36,7 @@ func newNatTest(tb testing.TB) *natTest {
nt := &natTest{
tb: tb,
tempDir: tb.TempDir(),
base: "/Users/bradfitz/src/tailscale.com/gokrazy/tsapp.qcow2",
base: "/Users/maisem/dev/tailscale.com/gokrazy/tsapp.qcow2",
}
if _, err := os.Stat(nt.base); err != nil {
@ -116,7 +116,7 @@ func (nt *natTest) runTest(node1, node2 addNodeFunc) {
"-M", "microvm,isa-serial=off",
"-m", "1G",
"-nodefaults", "-no-user-config", "-nographic",
"-kernel", "/Users/bradfitz/src/github.com/tailscale/gokrazy-kernel/vmlinuz",
"-kernel", "/Users/maisem/dev/github.com/tailscale/gokrazy-kernel/vmlinuz",
"-append", "console=hvc0 root=PARTUUID=60c24cc1-f3f9-427a-8199-dd02023b0001/PARTNROFF=1 ro init=/gokrazy/init panic=10 oops=panic pci=off nousb tsc=unstable clocksource=hpet tailscale-tta=1",
"-drive", "id=blk0,file="+disk+",format=qcow2",
"-device", "virtio-blk-device,drive=blk0",
@ -142,15 +142,16 @@ func (nt *natTest) runTest(node1, node2 addNodeFunc) {
ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
defer cancel()
c1 := &http.Client{Transport: nt.vnet.NodeAgentRoundTripper(nodes[0])}
c2 := &http.Client{Transport: nt.vnet.NodeAgentRoundTripper(nodes[1])}
lc1 := nt.vnet.NodeAgentClient(nodes[0])
lc2 := nt.vnet.NodeAgentClient(nodes[1])
clients := []*vnet.NodeAgentClient{lc1, lc2}
var eg errgroup.Group
var sts [2]*ipnstate.Status
for i, c := range []*http.Client{c1, c2} {
for i, c := range clients {
i, c := i, c
eg.Go(func() error {
st, err := status(ctx, c)
st, err := c.Status(ctx)
if err != nil {
return fmt.Errorf("node%d status: %w", i, err)
}
@ -159,7 +160,7 @@ func (nt *natTest) runTest(node1, node2 addNodeFunc) {
return fmt.Errorf("node%d up: %w", i, err)
}
t.Logf("node%d up!", i)
st, err = status(ctx, c)
st, err = c.Status(ctx)
if err != nil {
return fmt.Errorf("node%d status: %w", i, err)
}
@ -176,85 +177,40 @@ func (nt *natTest) runTest(node1, node2 addNodeFunc) {
t.Fatalf("initial setup: %v", err)
}
route, err := ping(ctx, c1, sts[1].Self.TailscaleIPs[0].String())
route, err := ping(ctx, lc1, sts[1].Self.TailscaleIPs[0])
t.Logf("ping route: %v, %v", route, err)
}
func status(ctx context.Context, c *http.Client) (*ipnstate.Status, error) {
req, err := http.NewRequestWithContext(ctx, "GET", "http://unused/status", nil)
if err != nil {
return nil, err
}
res, err := c.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
all, err := io.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("ReadAll: %w", err)
}
var st ipnstate.Status
if err := json.Unmarshal(all, &st); err != nil {
return nil, fmt.Errorf("JSON marshal error: %v; body was %q", err, all)
}
return &st, nil
}
type routeType string
const (
routeDirect routeType = "direct"
routeDERP routeType = "derp"
routeLAN routeType = "lan"
)
func ping(ctx context.Context, c *http.Client, target string) (routeType, error) {
req, err := http.NewRequestWithContext(ctx, "POST", "http://unused/ping?target="+url.QueryEscape(target), nil)
if err != nil {
return "", err
}
res, err := c.Do(req)
if err != nil {
return "", err
}
defer res.Body.Close()
if res.StatusCode != 200 {
return "", fmt.Errorf("unexpected status code %v", res.Status)
}
all, _ := io.ReadAll(res.Body)
var route routeType
for _, line := range strings.Split(string(all), "\n") {
if strings.Contains(line, " via DERP") {
route = routeDERP
continue
}
// pong from foo (100.82.3.4) via ADDR:PORT in 69ms
if _, rest, ok := strings.Cut(line, " via "); ok {
ipPorStr, _, _ := strings.Cut(rest, " in ")
ipPort, err := netip.ParseAddrPort(ipPorStr)
if err == nil {
if ipPort.Addr().IsPrivate() {
route = routeLAN
} else {
route = routeDirect
}
continue
func ping(ctx context.Context, c *vnet.NodeAgentClient, target netip.Addr) (*ipnstate.PingResult, error) {
n := 0
var res *ipnstate.PingResult
anyPong := false
for {
n++
pr, err := c.PingWithOpts(ctx, target, tailcfg.PingDisco, tailscale.PingOpts{})
if err != nil {
if anyPong {
return res, nil
}
return nil, err
}
if pr.Err != "" {
return nil, errors.New(pr.Err)
}
if pr.DERPRegionID == 0 {
return pr, nil
}
time.Sleep(time.Second)
res = pr
}
if route == "" {
return routeType(all), nil
}
return route, nil
}
func up(ctx context.Context, c *http.Client) error {
func up(ctx context.Context, c *vnet.NodeAgentClient) error {
req, err := http.NewRequestWithContext(ctx, "GET", "http://unused/up", nil)
if err != nil {
return err
}
res, err := c.Do(req)
res, err := c.HTTPClient.Do(req)
if err != nil {
return err
}
@ -272,6 +228,7 @@ func TestEasyEasy(t *testing.T) {
}
func TestEasyHard(t *testing.T) {
t.Skip()
nt := newNatTest(t)
nt.runTest(easy, hard)
}

40
tstest/natlab/vnet/vnet.go
Unescape Escape View File

@ -46,6 +46,7 @@ import (
"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
"gvisor.dev/gvisor/pkg/waiter"
"tailscale.com/client/tailscale"
"tailscale.com/derp"
"tailscale.com/derp/derphttp"
"tailscale.com/net/netutil"
@ -279,7 +280,7 @@ func (n *network) acceptTCP(r *tcp.ForwarderRequest) {
bs := bufio.NewScanner(tc)
for bs.Scan() {
line := bs.Text()
log.Printf("LOG from guest: %s", line)
log.Printf("LOG from guest %v: %s", clientRemoteIP, line)
}
}()
return
@ -1356,6 +1357,11 @@ func (s *Server) takeAgentConnOne(n *node) (_ *agentConn, ok bool) {
return nil, false
}
type NodeAgentClient struct {
*tailscale.LocalClient
HTTPClient *http.Client
}
func (s *Server) NodeAgentDialer(n *Node) DialFunc {
s.mu.Lock()
defer s.mu.Unlock()
@ -1374,26 +1380,16 @@ func (s *Server) NodeAgentDialer(n *Node) DialFunc {
return d
}
func (s *Server) NodeAgentRoundTripper(n *Node) http.RoundTripper {
return &http.Transport{
DialContext: s.NodeAgentDialer(n),
}
}
func (s *Server) NodeStatus(ctx context.Context, n *Node) ([]byte, error) {
rt := s.NodeAgentRoundTripper(n)
req, err := http.NewRequestWithContext(ctx, "GET", "http://node/status", nil)
if err != nil {
return nil, err
}
res, err := rt.RoundTrip(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != 200 {
body, _ := io.ReadAll(io.LimitReader(res.Body, 1<<20))
return nil, fmt.Errorf("status: %v, %s, %v", res.Status, body, res.Header)
func (s *Server) NodeAgentClient(n *Node) *NodeAgentClient {
d := s.NodeAgentDialer(n)
return &NodeAgentClient{
LocalClient: &tailscale.LocalClient{
Dial: d,
},
HTTPClient: &http.Client{
Transport: &http.Transport{
DialContext: d,
},
},
}
return io.ReadAll(res.Body)
}

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