src/net/http/cgi/integration_test.go

   1 // Copyright 2011 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // Tests a Go CGI program running under a Go CGI host process.
   6 // Further, the two programs are the same binary, just checking
   7 // their environment to figure out what mode to run in.
   8
   9 package cgi
  10
  11 import (
  12         "bytes"
  13         "errors"
  14         "fmt"
  15         "internal/testenv"
  16         "io"
  17         "net/http"
  18         "net/http/httptest"
  19         "os"
  20         "testing"
  21         "time"
  22 )
  23
  24 // This test is a CGI host (testing host.go) that runs its own binary
  25 // as a child process testing the other half of CGI (child.go).
  26 func TestHostingOurselves(t *testing.T) {
  27         testenv.MustHaveExec(t)
  28
  29         h := &Handler{
  30                 Path: os.Args[0],
  31                 Root: "/test.go",
  32                 Args: []string{"-test.run=TestBeChildCGIProcess"},
  33         }
  34         expectedMap := map[string]string{
  35                 "test":                  "Hello CGI-in-CGI",
  36                 "param-a":               "b",
  37                 "param-foo":             "bar",
  38                 "env-GATEWAY_INTERFACE": "CGI/1.1",
  39                 "env-HTTP_HOST":         "example.com",
  40                 "env-PATH_INFO":         "",
  41                 "env-QUERY_STRING":      "foo=bar&a=b",
  42                 "env-REMOTE_ADDR":       "1.2.3.4",
  43                 "env-REMOTE_HOST":       "1.2.3.4",
  44                 "env-REMOTE_PORT":       "1234",
  45                 "env-REQUEST_METHOD":    "GET",
  46                 "env-REQUEST_URI":       "/test.go?foo=bar&a=b",
  47                 "env-SCRIPT_FILENAME":   os.Args[0],
  48                 "env-SCRIPT_NAME":       "/test.go",
  49                 "env-SERVER_NAME":       "example.com",
  50                 "env-SERVER_PORT":       "80",
  51                 "env-SERVER_SOFTWARE":   "go",
  52         }
  53         replay := runCgiTest(t, h, "GET /test.go?foo=bar&a=b HTTP/1.0\nHost: example.com\n\n", expectedMap)
  54
  55         if expected, got := "text/html; charset=utf-8", replay.Header().Get("Content-Type"); got != expected {
  56                 t.Errorf("got a Content-Type of %q; expected %q", got, expected)
  57         }
  58         if expected, got := "X-Test-Value", replay.Header().Get("X-Test-Header"); got != expected {
  59                 t.Errorf("got a X-Test-Header of %q; expected %q", got, expected)
  60         }
  61 }
  62
  63 type customWriterRecorder struct {
  64         w io.Writer
  65         *httptest.ResponseRecorder
  66 }
  67
  68 func (r *customWriterRecorder) Write(p []byte) (n int, err error) {
  69         return r.w.Write(p)
  70 }
  71
  72 type limitWriter struct {
  73         w io.Writer
  74         n int
  75 }
  76
  77 func (w *limitWriter) Write(p []byte) (n int, err error) {
  78         if len(p) > w.n {
  79                 p = p[:w.n]
  80         }
  81         if len(p) > 0 {
  82                 n, err = w.w.Write(p)
  83                 w.n -= n
  84         }
  85         if w.n == 0 {
  86                 err = errors.New("past write limit")
  87         }
  88         return
  89 }
  90
  91 // If there's an error copying the child's output to the parent, test
  92 // that we kill the child.
  93 func TestKillChildAfterCopyError(t *testing.T) {
  94         testenv.MustHaveExec(t)
  95
  96         defer func() { testHookStartProcess = nil }()
  97         proc := make(chan *os.Process, 1)
  98         testHookStartProcess = func(p *os.Process) {
  99                 proc <- p
 100         }
 101
 102         h := &Handler{
 103                 Path: os.Args[0],
 104                 Root: "/test.go",
 105                 Args: []string{"-test.run=TestBeChildCGIProcess"},
 106         }
 107         req, _ := http.NewRequest("GET", "http://example.com/test.cgi?write-forever=1", nil)
 108         rec := httptest.NewRecorder()
 109         var out bytes.Buffer
 110         const writeLen = 50 << 10
 111         rw := &customWriterRecorder{&limitWriter{&out, writeLen}, rec}
 112
 113         donec := make(chan bool, 1)
 114         go func() {
 115                 h.ServeHTTP(rw, req)
 116                 donec <- true
 117         }()
 118
 119         select {
 120         case <-donec:
 121                 if out.Len() != writeLen || out.Bytes()[0] != 'a' {
 122                         t.Errorf("unexpected output: %q", out.Bytes())
 123                 }
 124         case <-time.After(5 * time.Second):
 125                 t.Errorf("timeout. ServeHTTP hung and didn't kill the child process?")
 126                 select {
 127                 case p := <-proc:
 128                         p.Kill()
 129                         t.Logf("killed process")
 130                 default:
 131                         t.Logf("didn't kill process")
 132                 }
 133         }
 134 }
 135
 136 // Test that a child handler writing only headers works.
 137 // golang.org/issue/7196
 138 func TestChildOnlyHeaders(t *testing.T) {
 139         testenv.MustHaveExec(t)
 140
 141         h := &Handler{
 142                 Path: os.Args[0],
 143                 Root: "/test.go",
 144                 Args: []string{"-test.run=TestBeChildCGIProcess"},
 145         }
 146         expectedMap := map[string]string{
 147                 "_body": "",
 148         }
 149         replay := runCgiTest(t, h, "GET /test.go?no-body=1 HTTP/1.0\nHost: example.com\n\n", expectedMap)
 150         if expected, got := "X-Test-Value", replay.Header().Get("X-Test-Header"); got != expected {
 151                 t.Errorf("got a X-Test-Header of %q; expected %q", got, expected)
 152         }
 153 }
 154
 155 // golang.org/issue/7198
 156 func Test500WithNoHeaders(t *testing.T)     { want500Test(t, "/immediate-disconnect") }
 157 func Test500WithNoContentType(t *testing.T) { want500Test(t, "/no-content-type") }
 158 func Test500WithEmptyHeaders(t *testing.T)  { want500Test(t, "/empty-headers") }
 159
 160 func want500Test(t *testing.T, path string) {
 161         h := &Handler{
 162                 Path: os.Args[0],
 163                 Root: "/test.go",
 164                 Args: []string{"-test.run=TestBeChildCGIProcess"},
 165         }
 166         expectedMap := map[string]string{
 167                 "_body": "",
 168         }
 169         replay := runCgiTest(t, h, "GET "+path+" HTTP/1.0\nHost: example.com\n\n", expectedMap)
 170         if replay.Code != 500 {
 171                 t.Errorf("Got code %d; want 500", replay.Code)
 172         }
 173 }
 174
 175 type neverEnding byte
 176
 177 func (b neverEnding) Read(p []byte) (n int, err error) {
 178         for i := range p {
 179                 p[i] = byte(b)
 180         }
 181         return len(p), nil
 182 }
 183
 184 // Note: not actually a test.
 185 func TestBeChildCGIProcess(t *testing.T) {
 186         if os.Getenv("REQUEST_METHOD") == "" {
 187                 // Not in a CGI environment; skipping test.
 188                 return
 189         }
 190         switch os.Getenv("REQUEST_URI") {
 191         case "/immediate-disconnect":
 192                 os.Exit(0)
 193         case "/no-content-type":
 194                 fmt.Printf("Content-Length: 6\n\nHello\n")
 195                 os.Exit(0)
 196         case "/empty-headers":
 197                 fmt.Printf("\nHello")
 198                 os.Exit(0)
 199         }
 200         Serve(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
 201                 rw.Header().Set("X-Test-Header", "X-Test-Value")
 202                 req.ParseForm()
 203                 if req.FormValue("no-body") == "1" {
 204                         return
 205                 }
 206                 if req.FormValue("write-forever") == "1" {
 207                         io.Copy(rw, neverEnding('a'))
 208                         for {
 209                                 time.Sleep(5 * time.Second) // hang forever, until killed
 210                         }
 211                 }
 212                 fmt.Fprintf(rw, "test=Hello CGI-in-CGI\n")
 213                 for k, vv := range req.Form {
 214                         for _, v := range vv {
 215                                 fmt.Fprintf(rw, "param-%s=%s\n", k, v)
 216                         }
 217                 }
 218                 for _, kv := range os.Environ() {
 219                         fmt.Fprintf(rw, "env-%s\n", kv)
 220                 }
 221         }))
 222         os.Exit(0)
 223 }