tailscale/tsweb/tsweb_test.go

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// Copyright (c) 2020 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 tsweb
import (
"bufio"
"context"
"errors"
"expvar"
"fmt"
"io"
"net"
"net/http"
"net/http/httptest"
"strings"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"tailscale.com/metrics"
"tailscale.com/tstest"
)
type noopHijacker struct {
*httptest.ResponseRecorder
hijacked bool
}
func (h *noopHijacker) Hijack() (net.Conn, *bufio.ReadWriter, error) {
// Hijack "successfully" but don't bother returning a conn.
h.hijacked = true
return nil, nil, nil
}
type handlerFunc func(http.ResponseWriter, *http.Request) error
func (f handlerFunc) ServeHTTPReturn(w http.ResponseWriter, r *http.Request) error {
return f(w, r)
}
func TestStdHandler(t *testing.T) {
var (
handlerCode = func(code int) ReturnHandler {
return handlerFunc(func(w http.ResponseWriter, r *http.Request) error {
w.WriteHeader(code)
return nil
})
}
handlerErr = func(code int, err error) ReturnHandler {
return handlerFunc(func(w http.ResponseWriter, r *http.Request) error {
if code != 0 {
w.WriteHeader(code)
}
return err
})
}
req = func(ctx context.Context, url string) *http.Request {
ret, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
panic(err)
}
return ret
}
testErr = errors.New("test error")
bgCtx = context.Background()
// canceledCtx, cancel = context.WithCancel(bgCtx)
clock = tstest.Clock{
Start: time.Now(),
Step: time.Second,
}
)
// cancel()
tests := []struct {
name string
rh ReturnHandler
r *http.Request
errHandler ErrorHandlerFunc
wantCode int
wantLog AccessLogRecord
}{
{
name: "handler returns 200",
rh: handlerCode(200),
r: req(bgCtx, "http://example.com/"),
wantCode: 200,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
TLS: false,
Host: "example.com",
Method: "GET",
Code: 200,
RequestURI: "/",
},
},
{
name: "handler returns 404",
rh: handlerCode(404),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 404,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Code: 404,
},
},
{
name: "handler returns 404 via HTTPError",
rh: handlerErr(0, Error(404, "not found", testErr)),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 404,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Err: "not found: " + testErr.Error(),
Code: 404,
},
},
{
name: "handler returns 404 with nil child error",
rh: handlerErr(0, Error(404, "not found", nil)),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 404,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Err: "not found",
Code: 404,
},
},
{
name: "handler returns generic error",
rh: handlerErr(0, testErr),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 500,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Err: testErr.Error(),
Code: 500,
},
},
{
name: "handler returns error after writing response",
rh: handlerErr(200, testErr),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 200,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Err: testErr.Error(),
Code: 200,
},
},
{
name: "handler returns HTTPError after writing response",
rh: handlerErr(200, Error(404, "not found", testErr)),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 200,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Err: "not found: " + testErr.Error(),
Code: 200,
},
},
{
name: "handler does nothing",
rh: handlerFunc(func(http.ResponseWriter, *http.Request) error { return nil }),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 200,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Code: 200,
},
},
{
name: "handler hijacks conn",
rh: handlerFunc(func(w http.ResponseWriter, r *http.Request) error {
_, _, err := w.(http.Hijacker).Hijack()
if err != nil {
t.Errorf("couldn't hijack: %v", err)
}
return err
}),
r: req(bgCtx, "http://example.com/foo"),
wantCode: 200,
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
Host: "example.com",
Method: "GET",
RequestURI: "/foo",
Code: 101,
},
},
{
name: "error handler gets run",
rh: handlerErr(0, Error(404, "not found", nil)), // status code changed in errHandler
r: req(bgCtx, "http://example.com/"),
wantCode: 200,
errHandler: func(w http.ResponseWriter, r *http.Request, e HTTPError) {
http.Error(w, e.Msg, 200)
},
wantLog: AccessLogRecord{
When: clock.Start,
Seconds: 1.0,
Proto: "HTTP/1.1",
TLS: false,
Host: "example.com",
Method: "GET",
Code: 404,
Err: "not found",
RequestURI: "/",
},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
var logs []AccessLogRecord
logf := func(fmt string, args ...any) {
if fmt == "%s" {
logs = append(logs, args[0].(AccessLogRecord))
}
t.Logf(fmt, args...)
}
clock.Reset()
rec := noopHijacker{httptest.NewRecorder(), false}
h := StdHandler(test.rh, HandlerOptions{Logf: logf, Now: clock.Now, OnError: test.errHandler})
h.ServeHTTP(&rec, test.r)
res := rec.Result()
if res.StatusCode != test.wantCode {
t.Errorf("HTTP code = %v, want %v", res.StatusCode, test.wantCode)
}
if len(logs) != 1 {
t.Errorf("handler didn't write a request log")
return
}
errTransform := cmp.Transformer("err", func(e error) string {
if e == nil {
return ""
}
return e.Error()
})
if diff := cmp.Diff(logs[0], test.wantLog, errTransform); diff != "" {
t.Errorf("handler wrote incorrect request log (-got+want):\n%s", diff)
}
})
}
}
func BenchmarkLogNot200(b *testing.B) {
b.ReportAllocs()
rh := handlerFunc(func(w http.ResponseWriter, r *http.Request) error {
// Implicit 200 OK.
return nil
})
h := StdHandler(rh, HandlerOptions{Quiet200s: true})
req := httptest.NewRequest("GET", "/", nil)
rw := new(httptest.ResponseRecorder)
for i := 0; i < b.N; i++ {
*rw = httptest.ResponseRecorder{}
h.ServeHTTP(rw, req)
}
}
func BenchmarkLog(b *testing.B) {
b.ReportAllocs()
rh := handlerFunc(func(w http.ResponseWriter, r *http.Request) error {
// Implicit 200 OK.
return nil
})
h := StdHandler(rh, HandlerOptions{})
req := httptest.NewRequest("GET", "/", nil)
rw := new(httptest.ResponseRecorder)
for i := 0; i < b.N; i++ {
*rw = httptest.ResponseRecorder{}
h.ServeHTTP(rw, req)
}
}
func TestVarzHandler(t *testing.T) {
t.Run("globals_log", func(t *testing.T) {
rec := httptest.NewRecorder()
VarzHandler(rec, httptest.NewRequest("GET", "/", nil))
t.Logf("Got: %s", rec.Body.Bytes())
})
tests := []struct {
name string
k string // key name
v expvar.Var
want string
}{
{
"int",
"foo",
new(expvar.Int),
"# TYPE foo counter\nfoo 0\n",
},
{
"int_with_type_counter",
"counter_foo",
new(expvar.Int),
"# TYPE foo counter\nfoo 0\n",
},
{
"int_with_type_gauge",
"gauge_foo",
new(expvar.Int),
"# TYPE foo gauge\nfoo 0\n",
},
{
"metrics_set",
"s",
&metrics.Set{
Map: *(func() *expvar.Map {
m := new(expvar.Map)
m.Init()
m.Add("foo", 1)
m.Add("bar", 2)
return m
})(),
},
"# TYPE s_bar counter\ns_bar 2\n# TYPE s_foo counter\ns_foo 1\n",
},
{
"metrics_set_TODO_gauge_type",
"gauge_s", // TODO(bradfitz): arguably a bug; should pass down type
&metrics.Set{
Map: *(func() *expvar.Map {
m := new(expvar.Map)
m.Init()
m.Add("foo", 1)
m.Add("bar", 2)
return m
})(),
},
"# TYPE s_bar counter\ns_bar 2\n# TYPE s_foo counter\ns_foo 1\n",
},
{
"expvar_map_untyped",
"api_status_code",
func() *expvar.Map {
m := new(expvar.Map)
m.Init()
m.Add("2xx", 100)
m.Add("5xx", 2)
return m
}(),
"api_status_code_2xx 100\napi_status_code_5xx 2\n",
},
{
"func_float64",
"counter_x",
expvar.Func(func() any { return float64(1.2) }),
"# TYPE x counter\nx 1.2\n",
},
{
"func_float64_gauge",
"gauge_x",
expvar.Func(func() any { return float64(1.2) }),
"# TYPE x gauge\nx 1.2\n",
},
{
"func_float64_untyped",
"x",
expvar.Func(func() any { return float64(1.2) }),
"x 1.2\n",
},
{
"metrics_label_map",
"counter_m",
&metrics.LabelMap{
Label: "label",
Map: *(func() *expvar.Map {
m := new(expvar.Map)
m.Init()
m.Add("foo", 1)
m.Add("bar", 2)
return m
})(),
},
"# TYPE m counter\nm{label=\"bar\"} 2\nm{label=\"foo\"} 1\n",
},
{
"metrics_label_map_untyped",
"control_save_config",
(func() *metrics.LabelMap {
m := &metrics.LabelMap{Label: "reason"}
m.Add("new", 1)
m.Add("updated", 1)
m.Add("fun", 1)
return m
})(),
"control_save_config{reason=\"fun\"} 1\ncontrol_save_config{reason=\"new\"} 1\ncontrol_save_config{reason=\"updated\"} 1\n",
},
{
"expvar_label_map",
"counter_labelmap_keyname_m",
func() *expvar.Map {
m := new(expvar.Map)
m.Init()
m.Add("foo", 1)
m.Add("bar", 2)
return m
}(),
"# TYPE m counter\nm{keyname=\"bar\"} 2\nm{keyname=\"foo\"} 1\n",
},
{
"struct_reflect",
"foo",
someExpVarWithJSONAndPromTypes(),
strings.TrimSpace(`
# TYPE foo_nestvalue_foo gauge
foo_nestvalue_foo 1
# TYPE foo_nestvalue_bar counter
foo_nestvalue_bar 2
# TYPE foo_nestptr_foo gauge
foo_nestptr_foo 10
# TYPE foo_nestptr_bar counter
foo_nestptr_bar 20
# TYPE foo_curX gauge
foo_curX 3
# TYPE foo_totalY counter
foo_totalY 4
# TYPE foo_curTemp gauge
foo_curTemp 20.6
# TYPE foo_AnInt8 counter
foo_AnInt8 127
# TYPE foo_AUint16 counter
foo_AUint16 65535
`) + "\n",
},
{
"struct_reflect_nil_root",
"foo",
expvarAdapter{(*SomeStats)(nil)},
"",
},
{
"func_returning_int",
"num_goroutines",
expvar.Func(func() any { return 123 }),
"num_goroutines 123\n",
},
{
"var_that_exports_itself",
"custom_var",
promWriter{},
"custom_var_value 42\n",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
defer func() { expvarDo = expvar.Do }()
expvarDo = func(f func(expvar.KeyValue)) {
f(expvar.KeyValue{Key: tt.k, Value: tt.v})
}
rec := httptest.NewRecorder()
VarzHandler(rec, httptest.NewRequest("GET", "/", nil))
if got := rec.Body.Bytes(); string(got) != tt.want {
t.Errorf("mismatch\n got: %q\n%s\nwant: %q\n%s\n", got, got, tt.want, tt.want)
}
})
}
}
type SomeNested struct {
FooG int64 `json:"foo" metrictype:"gauge"`
BarC int64 `json:"bar" metrictype:"counter"`
Omit int `json:"-" metrictype:"counter"`
}
type SomeStats struct {
Nested SomeNested `json:"nestvalue"`
NestedPtr *SomeNested `json:"nestptr"`
NestedNilPtr *SomeNested `json:"nestnilptr"`
CurX int `json:"curX" metrictype:"gauge"`
NoMetricType int `json:"noMetric" metrictype:""`
TotalY int64 `json:"totalY,omitempty" metrictype:"counter"`
CurTemp float64 `json:"curTemp" metrictype:"gauge"`
AnInt8 int8 `metrictype:"counter"`
AUint16 uint16 `metrictype:"counter"`
}
// someExpVarWithJSONAndPromTypes returns an expvar.Var that
// implements PrometheusMetricsReflectRooter for TestVarzHandler.
func someExpVarWithJSONAndPromTypes() expvar.Var {
st := &SomeStats{
Nested: SomeNested{
FooG: 1,
BarC: 2,
Omit: 3,
},
NestedPtr: &SomeNested{
FooG: 10,
BarC: 20,
},
CurX: 3,
TotalY: 4,
CurTemp: 20.6,
AnInt8: 127,
AUint16: 65535,
}
return expvarAdapter{st}
}
type expvarAdapter struct {
st *SomeStats
}
func (expvarAdapter) String() string { return "{}" } // expvar JSON; unused in test
func (a expvarAdapter) PrometheusMetricsReflectRoot() any {
return a.st
}
type promWriter struct{}
func (promWriter) WritePrometheus(w io.Writer, prefix string) {
fmt.Fprintf(w, "%s_value 42\n", prefix)
}
func (promWriter) String() string {
return ""
}
func TestAcceptsEncoding(t *testing.T) {
tests := []struct {
in, enc string
want bool
}{
{"", "gzip", false},
{"gzip", "gzip", true},
{"foo,gzip", "gzip", true},
{"foo, gzip", "gzip", true},
{"foo, gzip ", "gzip", true},
{"gzip, foo ", "gzip", true},
{"gzip, foo ", "br", false},
{"gzip, foo ", "fo", false},
{"gzip;q=1.2, foo ", "gzip", true},
{" gzip;q=1.2, foo ", "gzip", true},
}
for i, tt := range tests {
h := make(http.Header)
if tt.in != "" {
h.Set("Accept-Encoding", tt.in)
}
got := AcceptsEncoding(&http.Request{Header: h}, tt.enc)
if got != tt.want {
t.Errorf("%d. got %v; want %v", i, got, tt.want)
}
}
}
func TestPort80Handler(t *testing.T) {
tests := []struct {
name string
h *Port80Handler
req string
wantLoc string
}{
{
name: "no_fqdn",
h: &Port80Handler{},
req: "GET / HTTP/1.1\r\nHost: foo.com\r\n\r\n",
wantLoc: "https://foo.com/",
},
{
name: "fqdn_and_path",
h: &Port80Handler{FQDN: "bar.com"},
req: "GET /path HTTP/1.1\r\nHost: foo.com\r\n\r\n",
wantLoc: "https://bar.com/path",
},
{
name: "path_and_query_string",
h: &Port80Handler{FQDN: "baz.com"},
req: "GET /path?a=b HTTP/1.1\r\nHost: foo.com\r\n\r\n",
wantLoc: "https://baz.com/path?a=b",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
r, _ := http.ReadRequest(bufio.NewReader(strings.NewReader(tt.req)))
rec := httptest.NewRecorder()
tt.h.ServeHTTP(rec, r)
got := rec.Result()
if got, want := got.StatusCode, 302; got != want {
t.Errorf("got status code %v; want %v", got, want)
}
if got, want := got.Header.Get("Location"), "https://foo.com/"; got != tt.wantLoc {
t.Errorf("Location = %q; want %q", got, want)
}
})
}
}