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
5package http2
6
7import (
8	"fmt"
9	"math"
10	"reflect"
11	"testing"
12)
13
14func makeWriteNonStreamRequest() FrameWriteRequest {
15	return FrameWriteRequest{writeSettingsAck{}, nil, nil}
16}
17
18func makeWriteHeadersRequest(streamID uint32) FrameWriteRequest {
19	st := &stream{id: streamID}
20	return FrameWriteRequest{&writeResHeaders{streamID: streamID, httpResCode: 200}, st, nil}
21}
22
23func 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
40func 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
52func 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
119func 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}
126