// 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"
"net"
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"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
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,
},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
var logs []AccessLogRecord
logf := func(fmt string, args ...interface{}) {
if fmt == "%s" {
logs = append(logs, args[0].(AccessLogRecord))
}
t.Logf(fmt, args...)
}
clock.Reset()
rec := noopHijacker{httptest.NewRecorder(), false}
h := StdHandlerOpts(test.rh, HandlerOptions{Logf: logf, Now: clock.Now})
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
})
discardLogger := func(string, ...interface{}) {}
h := StdHandlerNo200s(rh, discardLogger)
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
})
discardLogger := func(string, ...interface{}) {}
h := StdHandler(rh, discardLogger)
req := httptest.NewRequest("GET", "/", nil)
rw := new(httptest.ResponseRecorder)
for i := 0; i < b.N; i++ {
*rw = httptest.ResponseRecorder{}
h.ServeHTTP(rw, req)
}
}