func TestNoTimeout(t *testing.T) {
ctx := context.Background()
resp, err := doRequest(ctx)
if resp == nil || err != nil {
t.Fatalf("error received from client: %v %v", err, resp)
}
}
func ExampleWithTimeout() {
// Pass a context with a timeout to tell a blocking function that it
// should abandon its work after the timeout elapses.
ctx, _ := context.WithTimeout(context.Background(), 100*time.Millisecond)
select {
case <-time.After(200 * time.Millisecond):
fmt.Println("overslept")
case <-ctx.Done():
fmt.Println(ctx.Err()) // prints "context deadline exceeded"
}
// Output:
// context deadline exceeded
}
func TestCancelAfterRequest(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
resp, err := doRequest(ctx)
// Cancel before reading the body.
// Request.Body should still be readable after the context is canceled.
cancel()
b, err := ioutil.ReadAll(resp.Body)
if err != nil || string(b) != requestBody {
t.Fatalf("could not read body: %q %v", b, err)
}
}
func TestCancel(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
go func() {
time.Sleep(requestDuration / 2)
cancel()
}()
resp, err := doRequest(ctx)
if resp != nil || err == nil {
t.Fatalf("expected error, didn't get one. resp: %v", resp)
}
if err != ctx.Err() {
t.Fatalf("expected error from context but got: %v", err)
}
}
func TestCancelAfterHangingRequest(t *testing.T) {
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
<-w.(http.CloseNotifier).CloseNotify()
})
serv := httptest.NewServer(handler)
defer serv.Close()
ctx, cancel := context.WithCancel(context.Background())
resp, err := Get(ctx, nil, serv.URL)
if err != nil {
t.Fatalf("unexpected error in Get: %v", err)
}
// Cancel befer reading the body.
// Reading Request.Body should fail, since the request was
// canceled before anything was written.
cancel()
done := make(chan struct{})
go func() {
b, err := ioutil.ReadAll(resp.Body)
if len(b) != 0 || err == nil {
t.Errorf(`Read got (%q, %v); want ("", error)`, b, err)
}
close(done)
}()
select {
case <-time.After(1 * time.Second):
t.Errorf("Test timed out")
case <-done:
}
}