github.com/Andyfoo/golang/x/net@v0.0.0-20190901054642-57c1bf301704/http2/writesched_test.go (about)

     1  // Copyright 2016 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  package http2
     6  
     7  import (
     8  	"fmt"
     9  	"math"
    10  	"reflect"
    11  	"testing"
    12  )
    13  
    14  func makeWriteNonStreamRequest() FrameWriteRequest {
    15  	return FrameWriteRequest{writeSettingsAck{}, nil, nil}
    16  }
    17  
    18  func makeWriteHeadersRequest(streamID uint32) FrameWriteRequest {
    19  	st := &stream{id: streamID}
    20  	return FrameWriteRequest{&writeResHeaders{streamID: streamID, httpResCode: 200}, st, nil}
    21  }
    22  
    23  func checkConsume(wr FrameWriteRequest, nbytes int32, want []FrameWriteRequest) error {
    24  	consumed, rest, n := wr.Consume(nbytes)
    25  	var wantConsumed, wantRest FrameWriteRequest
    26  	switch len(want) {
    27  	case 0:
    28  	case 1:
    29  		wantConsumed = want[0]
    30  	case 2:
    31  		wantConsumed = want[0]
    32  		wantRest = want[1]
    33  	}
    34  	if !reflect.DeepEqual(consumed, wantConsumed) || !reflect.DeepEqual(rest, wantRest) || n != len(want) {
    35  		return fmt.Errorf("got %v, %v, %v\nwant %v, %v, %v", consumed, rest, n, wantConsumed, wantRest, len(want))
    36  	}
    37  	return nil
    38  }
    39  
    40  func TestFrameWriteRequestNonData(t *testing.T) {
    41  	wr := makeWriteNonStreamRequest()
    42  	if got, want := wr.DataSize(), 0; got != want {
    43  		t.Errorf("DataSize: got %v, want %v", got, want)
    44  	}
    45  
    46  	// Non-DATA frames are always consumed whole.
    47  	if err := checkConsume(wr, 0, []FrameWriteRequest{wr}); err != nil {
    48  		t.Errorf("Consume:\n%v", err)
    49  	}
    50  }
    51  
    52  func TestFrameWriteRequestData(t *testing.T) {
    53  	st := &stream{
    54  		id: 1,
    55  		sc: &serverConn{maxFrameSize: 16},
    56  	}
    57  	const size = 32
    58  	wr := FrameWriteRequest{&writeData{st.id, make([]byte, size), true}, st, make(chan error)}
    59  	if got, want := wr.DataSize(), size; got != want {
    60  		t.Errorf("DataSize: got %v, want %v", got, want)
    61  	}
    62  
    63  	// No flow-control bytes available: cannot consume anything.
    64  	if err := checkConsume(wr, math.MaxInt32, []FrameWriteRequest{}); err != nil {
    65  		t.Errorf("Consume(limited by flow control):\n%v", err)
    66  	}
    67  
    68  	// Add enough flow-control bytes to consume the entire frame,
    69  	// but we're now restricted by st.sc.maxFrameSize.
    70  	st.flow.add(size)
    71  	want := []FrameWriteRequest{
    72  		{
    73  			write:  &writeData{st.id, make([]byte, st.sc.maxFrameSize), false},
    74  			stream: st,
    75  			done:   nil,
    76  		},
    77  		{
    78  			write:  &writeData{st.id, make([]byte, size-st.sc.maxFrameSize), true},
    79  			stream: st,
    80  			done:   wr.done,
    81  		},
    82  	}
    83  	if err := checkConsume(wr, math.MaxInt32, want); err != nil {
    84  		t.Errorf("Consume(limited by maxFrameSize):\n%v", err)
    85  	}
    86  	rest := want[1]
    87  
    88  	// Consume 8 bytes from the remaining frame.
    89  	want = []FrameWriteRequest{
    90  		{
    91  			write:  &writeData{st.id, make([]byte, 8), false},
    92  			stream: st,
    93  			done:   nil,
    94  		},
    95  		{
    96  			write:  &writeData{st.id, make([]byte, size-st.sc.maxFrameSize-8), true},
    97  			stream: st,
    98  			done:   wr.done,
    99  		},
   100  	}
   101  	if err := checkConsume(rest, 8, want); err != nil {
   102  		t.Errorf("Consume(8):\n%v", err)
   103  	}
   104  	rest = want[1]
   105  
   106  	// Consume all remaining bytes.
   107  	want = []FrameWriteRequest{
   108  		{
   109  			write:  &writeData{st.id, make([]byte, size-st.sc.maxFrameSize-8), true},
   110  			stream: st,
   111  			done:   wr.done,
   112  		},
   113  	}
   114  	if err := checkConsume(rest, math.MaxInt32, want); err != nil {
   115  		t.Errorf("Consume(remainder):\n%v", err)
   116  	}
   117  }
   118  
   119  func TestFrameWriteRequest_StreamID(t *testing.T) {
   120  	const streamID = 123
   121  	wr := FrameWriteRequest{write: streamError(streamID, ErrCodeNo)}
   122  	if got := wr.StreamID(); got != streamID {
   123  		t.Errorf("FrameWriteRequest(StreamError) = %v; want %v", got, streamID)
   124  	}
   125  }