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tailscale/tstest/integration/integration_test.go

870 lines
20 KiB
Go

// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package integration
//go:generate go run gen_deps.go
import (
"bytes"
"context"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"net/http/httptest"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"go4.org/mem"
"inet.af/netaddr"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnstate"
"tailscale.com/safesocket"
"tailscale.com/tailcfg"
"tailscale.com/tstest"
"tailscale.com/tstest/integration/testcontrol"
"tailscale.com/types/logger"
)
var (
verboseTailscaled = flag.Bool("verbose-tailscaled", false, "verbose tailscaled logging")
verboseTailscale = flag.Bool("verbose-tailscale", false, "verbose tailscale CLI logging")
)
var mainError atomic.Value // of error
func TestMain(m *testing.M) {
// Have to disable UPnP which hits the network, otherwise it fails due to HTTP proxy.
os.Setenv("TS_DISABLE_UPNP", "true")
flag.Parse()
v := m.Run()
if v != 0 {
os.Exit(v)
}
if err, ok := mainError.Load().(error); ok {
fmt.Fprintf(os.Stderr, "FAIL: %v\n", err)
os.Exit(1)
}
os.Exit(0)
}
func TestOneNodeUp_NoAuth(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n1 := newTestNode(t, env)
d1 := n1.StartDaemon(t)
defer d1.Kill()
n1.AwaitResponding(t)
n1.MustUp()
t.Logf("Got IP: %v", n1.AwaitIP(t))
n1.AwaitRunning(t)
d1.MustCleanShutdown(t)
t.Logf("number of HTTP logcatcher requests: %v", env.LogCatcher.numRequests())
}
func TestCollectPanic(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n := newTestNode(t, env)
cmd := exec.Command(n.env.Binaries.Daemon, "--cleanup")
cmd.Env = append(os.Environ(),
"TS_PLEASE_PANIC=1",
"TS_LOG_TARGET="+n.env.LogCatcherServer.URL,
)
got, _ := cmd.CombinedOutput() // we expect it to fail, ignore err
t.Logf("initial run: %s", got)
// Now we run it again, and on start, it will upload the logs to logcatcher.
cmd = exec.Command(n.env.Binaries.Daemon, "--cleanup")
cmd.Env = append(os.Environ(), "TS_LOG_TARGET="+n.env.LogCatcherServer.URL)
if out, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("cleanup failed: %v: %q", err, out)
}
if err := tstest.WaitFor(20*time.Second, func() error {
const sub = `panic`
if !n.env.LogCatcher.logsContains(mem.S(sub)) {
return fmt.Errorf("log catcher didn't see %#q; got %s", sub, n.env.LogCatcher.logsString())
}
return nil
}); err != nil {
t.Fatal(err)
}
}
// test Issue 2321: Start with UpdatePrefs should save prefs to disk
func TestStateSavedOnStart(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n1 := newTestNode(t, env)
d1 := n1.StartDaemon(t)
defer d1.Kill()
n1.AwaitResponding(t)
n1.MustUp()
t.Logf("Got IP: %v", n1.AwaitIP(t))
n1.AwaitRunning(t)
p1 := n1.diskPrefs(t)
t.Logf("Prefs1: %v", p1.Pretty())
// Bring it down, to prevent an EditPrefs call in the
// subsequent "up", as we want to test the bug when
// cmd/tailscale implements "up" via LocalBackend.Start.
n1.MustDown()
// And change the hostname to something:
if err := n1.Tailscale("up", "--login-server="+n1.env.ControlServer.URL, "--hostname=foo").Run(); err != nil {
t.Fatalf("up: %v", err)
}
p2 := n1.diskPrefs(t)
if pretty := p1.Pretty(); pretty == p2.Pretty() {
t.Errorf("Prefs didn't change on disk after 'up', still: %s", pretty)
}
if p2.Hostname != "foo" {
t.Errorf("Prefs.Hostname = %q; want foo", p2.Hostname)
}
d1.MustCleanShutdown(t)
}
func TestOneNodeUp_Auth(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins, configureControl(func(control *testcontrol.Server) {
control.RequireAuth = true
}))
defer env.Close()
n1 := newTestNode(t, env)
d1 := n1.StartDaemon(t)
defer d1.Kill()
n1.AwaitListening(t)
st := n1.MustStatus(t)
t.Logf("Status: %s", st.BackendState)
t.Logf("Running up --login-server=%s ...", env.ControlServer.URL)
cmd := n1.Tailscale("up", "--login-server="+env.ControlServer.URL)
var authCountAtomic int32
cmd.Stdout = &authURLParserWriter{fn: func(urlStr string) error {
if env.Control.CompleteAuth(urlStr) {
atomic.AddInt32(&authCountAtomic, 1)
t.Logf("completed auth path %s", urlStr)
return nil
}
err := fmt.Errorf("Failed to complete auth path to %q", urlStr)
t.Log(err)
return err
}}
cmd.Stderr = cmd.Stdout
if err := cmd.Run(); err != nil {
t.Fatalf("up: %v", err)
}
t.Logf("Got IP: %v", n1.AwaitIP(t))
n1.AwaitRunning(t)
if n := atomic.LoadInt32(&authCountAtomic); n != 1 {
t.Errorf("Auth URLs completed = %d; want 1", n)
}
d1.MustCleanShutdown(t)
}
func TestTwoNodes(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
// Create two nodes:
n1 := newTestNode(t, env)
n1SocksAddrCh := n1.socks5AddrChan()
d1 := n1.StartDaemon(t)
defer d1.Kill()
n2 := newTestNode(t, env)
n2SocksAddrCh := n2.socks5AddrChan()
d2 := n2.StartDaemon(t)
defer d2.Kill()
n1Socks := n1.AwaitSocksAddr(t, n1SocksAddrCh)
n2Socks := n1.AwaitSocksAddr(t, n2SocksAddrCh)
t.Logf("node1 SOCKS5 addr: %v", n1Socks)
t.Logf("node2 SOCKS5 addr: %v", n2Socks)
n1.AwaitListening(t)
n2.AwaitListening(t)
n1.MustUp()
n2.MustUp()
n1.AwaitRunning(t)
n2.AwaitRunning(t)
if err := tstest.WaitFor(2*time.Second, func() error {
st := n1.MustStatus(t)
if len(st.Peer) == 0 {
return errors.New("no peers")
}
if len(st.Peer) > 1 {
return fmt.Errorf("got %d peers; want 1", len(st.Peer))
}
peer := st.Peer[st.Peers()[0]]
if peer.ID == st.Self.ID {
return errors.New("peer is self")
}
return nil
}); err != nil {
t.Error(err)
}
d1.MustCleanShutdown(t)
d2.MustCleanShutdown(t)
}
func TestNodeAddressIPFields(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n1 := newTestNode(t, env)
d1 := n1.StartDaemon(t)
defer d1.Kill()
n1.AwaitListening(t)
n1.MustUp()
n1.AwaitRunning(t)
testNodes := env.Control.AllNodes()
if len(testNodes) != 1 {
t.Errorf("Expected %d nodes, got %d", 1, len(testNodes))
}
node := testNodes[0]
if len(node.Addresses) == 0 {
t.Errorf("Empty Addresses field in node")
}
if len(node.AllowedIPs) == 0 {
t.Errorf("Empty AllowedIPs field in node")
}
d1.MustCleanShutdown(t)
}
func TestAddPingRequest(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n1 := newTestNode(t, env)
d1 := n1.StartDaemon(t)
defer d1.Kill()
n1.AwaitListening(t)
n1.MustUp()
n1.AwaitRunning(t)
gotPing := make(chan bool, 1)
waitPing := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
gotPing <- true
}))
defer waitPing.Close()
nodes := env.Control.AllNodes()
if len(nodes) != 1 {
t.Fatalf("expected 1 node, got %d nodes", len(nodes))
}
nodeKey := nodes[0].Key
// Check that we get at least one ping reply after 10 tries.
for try := 1; try <= 10; try++ {
t.Logf("ping %v ...", try)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
if err := env.Control.AwaitNodeInMapRequest(ctx, nodeKey); err != nil {
t.Fatal(err)
}
cancel()
pr := &tailcfg.PingRequest{URL: fmt.Sprintf("%s/ping-%d", waitPing.URL, try), Log: true}
if !env.Control.AddPingRequest(nodeKey, pr) {
t.Logf("failed to AddPingRequest")
continue
}
// Wait for PingRequest to come back
pingTimeout := time.NewTimer(2 * time.Second)
defer pingTimeout.Stop()
select {
case <-gotPing:
t.Logf("got ping; success")
return
case <-pingTimeout.C:
// Try again.
}
}
t.Error("all ping attempts failed")
}
// Issue 2434: when "down" (WantRunning false), tailscaled shouldn't
// be connected to control.
func TestNoControlConnWhenDown(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n1 := newTestNode(t, env)
d1 := n1.StartDaemon(t)
defer d1.Kill()
n1.AwaitResponding(t)
// Come up the first time.
n1.MustUp()
ip1 := n1.AwaitIP(t)
n1.AwaitRunning(t)
// Then bring it down and stop the daemon.
n1.MustDown()
d1.MustCleanShutdown(t)
env.LogCatcher.Reset()
d2 := n1.StartDaemon(t)
defer d2.Kill()
n1.AwaitResponding(t)
st := n1.MustStatus(t)
if got, want := st.BackendState, "Stopped"; got != want {
t.Fatalf("after restart, state = %q; want %q", got, want)
}
ip2 := n1.AwaitIP(t)
if ip1 != ip2 {
t.Errorf("IPs different: %q vs %q", ip1, ip2)
}
// The real test: verify our daemon doesn't have an HTTP request open.:
if n := env.Control.InServeMap(); n != 0 {
t.Errorf("in serve map = %d; want 0", n)
}
d2.MustCleanShutdown(t)
}
// Issue 2137: make sure Windows tailscaled works with the CLI alone,
// without the GUI to kick off a Start.
func TestOneNodeUpWindowsStyle(t *testing.T) {
t.Parallel()
bins := BuildTestBinaries(t)
env := newTestEnv(t, bins)
defer env.Close()
n1 := newTestNode(t, env)
n1.upFlagGOOS = "windows"
d1 := n1.StartDaemonAsIPNGOOS(t, "windows")
defer d1.Kill()
n1.AwaitResponding(t)
n1.MustUp("--unattended")
t.Logf("Got IP: %v", n1.AwaitIP(t))
n1.AwaitRunning(t)
d1.MustCleanShutdown(t)
}
// testEnv contains the test environment (set of servers) used by one
// or more nodes.
type testEnv struct {
t testing.TB
Binaries *Binaries
LogCatcher *LogCatcher
LogCatcherServer *httptest.Server
Control *testcontrol.Server
ControlServer *httptest.Server
TrafficTrap *trafficTrap
TrafficTrapServer *httptest.Server
}
type testEnvOpt interface {
modifyTestEnv(*testEnv)
}
type configureControl func(*testcontrol.Server)
func (f configureControl) modifyTestEnv(te *testEnv) {
f(te.Control)
}
// newTestEnv starts a bunch of services and returns a new test
// environment.
//
// Call Close to shut everything down.
func newTestEnv(t testing.TB, bins *Binaries, opts ...testEnvOpt) *testEnv {
if runtime.GOOS == "windows" {
t.Skip("not tested/working on Windows yet")
}
derpMap := RunDERPAndSTUN(t, logger.Discard, "127.0.0.1")
logc := new(LogCatcher)
control := &testcontrol.Server{
DERPMap: derpMap,
}
control.HTTPTestServer = httptest.NewUnstartedServer(control)
trafficTrap := new(trafficTrap)
e := &testEnv{
t: t,
Binaries: bins,
LogCatcher: logc,
LogCatcherServer: httptest.NewServer(logc),
Control: control,
ControlServer: control.HTTPTestServer,
TrafficTrap: trafficTrap,
TrafficTrapServer: httptest.NewServer(trafficTrap),
}
for _, o := range opts {
o.modifyTestEnv(e)
}
control.HTTPTestServer.Start()
return e
}
func (e *testEnv) Close() error {
if err := e.TrafficTrap.Err(); err != nil {
e.t.Errorf("traffic trap: %v", err)
e.t.Logf("logs: %s", e.LogCatcher.logsString())
}
e.LogCatcherServer.Close()
e.TrafficTrapServer.Close()
e.ControlServer.Close()
return nil
}
// testNode is a machine with a tailscale & tailscaled.
// Currently, the test is simplistic and user==node==machine.
// That may grow complexity later to test more.
type testNode struct {
env *testEnv
dir string // temp dir for sock & state
sockFile string
stateFile string
upFlagGOOS string // if non-empty, sets TS_DEBUG_UP_FLAG_GOOS for cmd/tailscale CLI
mu sync.Mutex
onLogLine []func([]byte)
}
// newTestNode allocates a temp directory for a new test node.
// The node is not started automatically.
func newTestNode(t *testing.T, env *testEnv) *testNode {
dir := t.TempDir()
sockFile := filepath.Join(dir, "tailscale.sock")
if len(sockFile) >= 104 {
t.Fatalf("sockFile path %q (len %v) is too long, must be < 104", sockFile, len(sockFile))
}
return &testNode{
env: env,
dir: dir,
sockFile: sockFile,
stateFile: filepath.Join(dir, "tailscale.state"),
}
}
func (n *testNode) diskPrefs(t testing.TB) *ipn.Prefs {
t.Helper()
if _, err := ioutil.ReadFile(n.stateFile); err != nil {
t.Fatalf("reading prefs: %v", err)
}
fs, err := ipn.NewFileStore(n.stateFile)
if err != nil {
t.Fatalf("reading prefs, NewFileStore: %v", err)
}
prefBytes, err := fs.ReadState(ipn.GlobalDaemonStateKey)
if err != nil {
t.Fatalf("reading prefs, ReadState: %v", err)
}
p := new(ipn.Prefs)
if err := json.Unmarshal(prefBytes, p); err != nil {
t.Fatalf("reading prefs, JSON unmarshal: %v", err)
}
return p
}
// AwaitResponding waits for n's tailscaled to be up enough to be
// responding, but doesn't wait for any particular state.
func (n *testNode) AwaitResponding(t testing.TB) {
t.Helper()
n.AwaitListening(t)
st := n.MustStatus(t)
t.Logf("Status: %s", st.BackendState)
if err := tstest.WaitFor(20*time.Second, func() error {
const sub = `Program starting: `
if !n.env.LogCatcher.logsContains(mem.S(sub)) {
return fmt.Errorf("log catcher didn't see %#q; got %s", sub, n.env.LogCatcher.logsString())
}
return nil
}); err != nil {
t.Fatal(err)
}
}
// addLogLineHook registers a hook f to be called on each tailscaled
// log line output.
func (n *testNode) addLogLineHook(f func([]byte)) {
n.mu.Lock()
defer n.mu.Unlock()
n.onLogLine = append(n.onLogLine, f)
}
// socks5AddrChan returns a channel that receives the address (e.g. "localhost:23874")
// of the node's SOCKS5 listener, once started.
func (n *testNode) socks5AddrChan() <-chan string {
ch := make(chan string, 1)
n.addLogLineHook(func(line []byte) {
const sub = "SOCKS5 listening on "
i := mem.Index(mem.B(line), mem.S(sub))
if i == -1 {
return
}
addr := string(line)[i+len(sub):]
select {
case ch <- addr:
default:
}
})
return ch
}
func (n *testNode) AwaitSocksAddr(t testing.TB, ch <-chan string) string {
t.Helper()
timer := time.NewTimer(10 * time.Second)
defer timer.Stop()
select {
case v := <-ch:
return v
case <-timer.C:
t.Fatal("timeout waiting for node to log its SOCK5 listening address")
panic("unreachable")
}
}
// nodeOutputParser parses stderr of tailscaled processes, calling the
// per-line callbacks previously registered via
// testNode.addLogLineHook.
type nodeOutputParser struct {
buf bytes.Buffer
n *testNode
}
func (op *nodeOutputParser) Write(p []byte) (n int, err error) {
n, err = op.buf.Write(p)
op.parseLines()
return
}
func (op *nodeOutputParser) parseLines() {
n := op.n
buf := op.buf.Bytes()
for len(buf) > 0 {
nl := bytes.IndexByte(buf, '\n')
if nl == -1 {
break
}
line := buf[:nl+1]
buf = buf[nl+1:]
lineTrim := bytes.TrimSpace(line)
n.mu.Lock()
for _, f := range n.onLogLine {
f(lineTrim)
}
n.mu.Unlock()
}
if len(buf) == 0 {
op.buf.Reset()
} else {
io.CopyN(ioutil.Discard, &op.buf, int64(op.buf.Len()-len(buf)))
}
}
type Daemon struct {
Process *os.Process
}
func (d *Daemon) Kill() {
d.Process.Kill()
}
func (d *Daemon) MustCleanShutdown(t testing.TB) {
d.Process.Signal(os.Interrupt)
ps, err := d.Process.Wait()
if err != nil {
t.Fatalf("tailscaled Wait: %v", err)
}
if ps.ExitCode() != 0 {
t.Errorf("tailscaled ExitCode = %d; want 0", ps.ExitCode())
}
}
// StartDaemon starts the node's tailscaled, failing if it fails to
// start.
func (n *testNode) StartDaemon(t testing.TB) *Daemon {
return n.StartDaemonAsIPNGOOS(t, runtime.GOOS)
}
func (n *testNode) StartDaemonAsIPNGOOS(t testing.TB, ipnGOOS string) *Daemon {
cmd := exec.Command(n.env.Binaries.Daemon,
"--tun=userspace-networking",
"--state="+n.stateFile,
"--socket="+n.sockFile,
"--socks5-server=localhost:0",
)
cmd.Env = append(os.Environ(),
"TS_LOG_TARGET="+n.env.LogCatcherServer.URL,
"HTTP_PROXY="+n.env.TrafficTrapServer.URL,
"HTTPS_PROXY="+n.env.TrafficTrapServer.URL,
"TS_DEBUG_TAILSCALED_IPN_GOOS="+ipnGOOS,
"TS_LOGS_DIR="+t.TempDir(),
)
cmd.Stderr = &nodeOutputParser{n: n}
if *verboseTailscaled {
cmd.Stdout = os.Stdout
cmd.Stderr = io.MultiWriter(cmd.Stderr, os.Stderr)
}
if err := cmd.Start(); err != nil {
t.Fatalf("starting tailscaled: %v", err)
}
return &Daemon{
Process: cmd.Process,
}
}
func (n *testNode) MustUp(extraArgs ...string) {
t := n.env.t
args := []string{
"up",
"--login-server=" + n.env.ControlServer.URL,
}
args = append(args, extraArgs...)
t.Logf("Running %v ...", args)
if b, err := n.Tailscale(args...).CombinedOutput(); err != nil {
t.Fatalf("up: %v, %v", string(b), err)
}
}
func (n *testNode) MustDown() {
t := n.env.t
t.Logf("Running down ...")
if err := n.Tailscale("down").Run(); err != nil {
t.Fatalf("down: %v", err)
}
}
// AwaitListening waits for the tailscaled to be serving local clients
// over its localhost IPC mechanism. (Unix socket, etc)
func (n *testNode) AwaitListening(t testing.TB) {
if err := tstest.WaitFor(20*time.Second, func() (err error) {
c, err := safesocket.Connect(n.sockFile, 41112)
if err != nil {
return err
}
c.Close()
return nil
}); err != nil {
t.Fatal(err)
}
}
func (n *testNode) AwaitIPs(t testing.TB) []netaddr.IP {
t.Helper()
var addrs []netaddr.IP
if err := tstest.WaitFor(20*time.Second, func() error {
cmd := n.Tailscale("ip")
cmd.Stdout = nil // in case --verbose-tailscale was set
cmd.Stderr = nil // in case --verbose-tailscale was set
out, err := cmd.Output()
if err != nil {
return err
}
ips := string(out)
ipslice := strings.Fields(ips)
addrs = make([]netaddr.IP, len(ipslice))
for i, ip := range ipslice {
netIP, err := netaddr.ParseIP(ip)
if err != nil {
t.Fatal(err)
}
addrs[i] = netIP
}
return nil
}); err != nil {
t.Fatalf("awaiting an IP address: %v", err)
}
if len(addrs) == 0 {
t.Fatalf("returned IP address was blank")
}
return addrs
}
// AwaitIP returns the IP address of n.
func (n *testNode) AwaitIP(t testing.TB) netaddr.IP {
t.Helper()
ips := n.AwaitIPs(t)
return ips[0]
}
// AwaitRunning waits for n to reach the IPN state "Running".
func (n *testNode) AwaitRunning(t testing.TB) {
t.Helper()
if err := tstest.WaitFor(20*time.Second, func() error {
st, err := n.Status()
if err != nil {
return err
}
if st.BackendState != "Running" {
return fmt.Errorf("in state %q", st.BackendState)
}
return nil
}); err != nil {
t.Fatalf("failure/timeout waiting for transition to Running status: %v", err)
}
}
// Tailscale returns a command that runs the tailscale CLI with the provided arguments.
// It does not start the process.
func (n *testNode) Tailscale(arg ...string) *exec.Cmd {
cmd := exec.Command(n.env.Binaries.CLI, "--socket="+n.sockFile)
cmd.Args = append(cmd.Args, arg...)
cmd.Dir = n.dir
cmd.Env = append(os.Environ(),
"TS_DEBUG_UP_FLAG_GOOS="+n.upFlagGOOS,
"TS_LOGS_DIR="+n.env.t.TempDir(),
)
if *verboseTailscale {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
return cmd
}
func (n *testNode) Status() (*ipnstate.Status, error) {
cmd := n.Tailscale("status", "--json")
cmd.Stdout = nil // in case --verbose-tailscale was set
cmd.Stderr = nil // in case --verbose-tailscale was set
out, err := cmd.CombinedOutput()
if err != nil {
return nil, fmt.Errorf("running tailscale status: %v, %s", err, out)
}
st := new(ipnstate.Status)
if err := json.Unmarshal(out, st); err != nil {
return nil, fmt.Errorf("decoding tailscale status JSON: %w", err)
}
return st, nil
}
func (n *testNode) MustStatus(tb testing.TB) *ipnstate.Status {
tb.Helper()
st, err := n.Status()
if err != nil {
tb.Fatal(err)
}
return st
}
// trafficTrap is an HTTP proxy handler to note whether any
// HTTP traffic tries to leave localhost from tailscaled. We don't
// expect any, so any request triggers a failure.
type trafficTrap struct {
atomicErr atomic.Value // of error
}
func (tt *trafficTrap) Err() error {
if err, ok := tt.atomicErr.Load().(error); ok {
return err
}
return nil
}
func (tt *trafficTrap) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var got bytes.Buffer
r.Write(&got)
err := fmt.Errorf("unexpected HTTP proxy via proxy: %s", got.Bytes())
mainError.Store(err)
if tt.Err() == nil {
// Best effort at remembering the first request.
tt.atomicErr.Store(err)
}
log.Printf("Error: %v", err)
w.WriteHeader(403)
}
type authURLParserWriter struct {
buf bytes.Buffer
fn func(urlStr string) error
}
var authURLRx = regexp.MustCompile(`(https?://\S+/auth/\S+)`)
func (w *authURLParserWriter) Write(p []byte) (n int, err error) {
n, err = w.buf.Write(p)
m := authURLRx.FindSubmatch(w.buf.Bytes())
if m != nil {
urlStr := string(m[1])
w.buf.Reset() // so it's not matched again
if err := w.fn(urlStr); err != nil {
return 0, err
}
}
return n, err
}