ctxhttp_test.go

Documentation: golang.org/x/net/context/ctxhttp

     1  // Copyright 2015 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  //go:build !plan9
     6  
     7  package ctxhttp
     8  
     9  import (
    10  	"context"
    11  	"io"
    12  	"io/ioutil"
    13  	"net/http"
    14  	"net/http/httptest"
    15  	"testing"
    16  	"time"
    17  )
    18  
    19  func TestGo17Context(t *testing.T) {
    20  	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    21  		io.WriteString(w, "ok")
    22  	}))
    23  	defer ts.Close()
    24  	ctx := context.Background()
    25  	resp, err := Get(ctx, http.DefaultClient, ts.URL)
    26  	if resp == nil || err != nil {
    27  		t.Fatalf("error received from client: %v %v", err, resp)
    28  	}
    29  	resp.Body.Close()
    30  }
    31  
    32  const (
    33  	requestDuration = 100 * time.Millisecond
    34  	requestBody     = "ok"
    35  )
    36  
    37  func okHandler(w http.ResponseWriter, r *http.Request) {
    38  	time.Sleep(requestDuration)
    39  	io.WriteString(w, requestBody)
    40  }
    41  
    42  func TestNoTimeout(t *testing.T) {
    43  	ts := httptest.NewServer(http.HandlerFunc(okHandler))
    44  	defer ts.Close()
    45  
    46  	ctx := context.Background()
    47  	res, err := Get(ctx, nil, ts.URL)
    48  	if err != nil {
    49  		t.Fatal(err)
    50  	}
    51  	defer res.Body.Close()
    52  	slurp, err := ioutil.ReadAll(res.Body)
    53  	if err != nil {
    54  		t.Fatal(err)
    55  	}
    56  	if string(slurp) != requestBody {
    57  		t.Errorf("body = %q; want %q", slurp, requestBody)
    58  	}
    59  }
    60  
    61  func TestCancelBeforeHeaders(t *testing.T) {
    62  	ctx, cancel := context.WithCancel(context.Background())
    63  
    64  	blockServer := make(chan struct{})
    65  	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    66  		cancel()
    67  		<-blockServer
    68  		io.WriteString(w, requestBody)
    69  	}))
    70  	defer ts.Close()
    71  	defer close(blockServer)
    72  
    73  	res, err := Get(ctx, nil, ts.URL)
    74  	if err == nil {
    75  		res.Body.Close()
    76  		t.Fatal("Get returned unexpected nil error")
    77  	}
    78  	if err != context.Canceled {
    79  		t.Errorf("err = %v; want %v", err, context.Canceled)
    80  	}
    81  }
    82  
    83  func TestCancelAfterHangingRequest(t *testing.T) {
    84  	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    85  		w.WriteHeader(http.StatusOK)
    86  		w.(http.Flusher).Flush()
    87  		<-w.(http.CloseNotifier).CloseNotify()
    88  	}))
    89  	defer ts.Close()
    90  
    91  	ctx, cancel := context.WithCancel(context.Background())
    92  	resp, err := Get(ctx, nil, ts.URL)
    93  	if err != nil {
    94  		t.Fatalf("unexpected error in Get: %v", err)
    95  	}
    96  
    97  	// Cancel befer reading the body.
    98  	// Reading Request.Body should fail, since the request was
    99  	// canceled before anything was written.
   100  	cancel()
   101  
   102  	done := make(chan struct{})
   103  
   104  	go func() {
   105  		b, err := ioutil.ReadAll(resp.Body)
   106  		if len(b) != 0 || err == nil {
   107  			t.Errorf(`Read got (%q, %v); want ("", error)`, b, err)
   108  		}
   109  		close(done)
   110  	}()
   111  
   112  	select {
   113  	case <-time.After(1 * time.Second):
   114  		t.Errorf("Test timed out")
   115  	case <-done:
   116  	}
   117  }
   118
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