test_frame_chop.c revision 758aff32 
1/* Copyright (c) 2017 - 2020 LiteSpeed Technologies Inc.  See LICENSE. */
2/*
3 * Write several things to HEADERS stream and check the results.  What
4 * varies is the amount of bytes that are written to stream every time.
5 * This will exercise buffering in frame writer and verify that contents
6 * are written out correctly no matter where frab writing leaves off
7 * and picks up.
8 */
9
10#include <assert.h>
11#include <errno.h>
12#include <limits.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#ifndef WIN32
17#include <unistd.h>
18#else
19#include <getopt.h>
20#endif
21#include <sys/queue.h>
22
23#include "lsquic.h"
24#include "lshpack.h"
25#include "lsquic_logger.h"
26#include "lsquic_mm.h"
27#include "lsquic_frame_common.h"
28#include "lsquic_frame_writer.h"
29#include "lsquic_frame_reader.h"
30#if LSQUIC_CONN_STATS
31#include "lsquic_int_types.h"
32#include "lsquic_hash.h"
33#include "lsquic_conn.h"
34#endif
35
36
37struct lsquic_stream
38{
39    size_t          sm_write_off,
40                    sm_buf_sz;      /* Number of bytes allocated */
41    size_t          sm_max_write;
42    size_t          sm_read_off;
43    unsigned char  *sm_buf;
44};
45
46
47static struct lsquic_stream *
48stream_new (size_t max_write)
49{
50    struct lsquic_stream *stream = calloc(1, sizeof(*stream));
51    stream->sm_max_write = max_write;
52    return stream;
53}
54
55
56static void
57stream_destroy (struct lsquic_stream *stream)
58{
59    free(stream->sm_buf);
60    free(stream);
61}
62
63
64#define reset_output(max_) do {         \
65    output.sz = 0;                      \
66    if (max_)                           \
67        output.max = max_;              \
68    else                                \
69        output.max = sizeof(output.buf);\
70} while (0)
71
72
73static ssize_t
74stream_write (struct lsquic_stream *stream, struct lsquic_reader *reader)
75{
76    size_t sz;
77
78    sz = reader->lsqr_size(reader->lsqr_ctx);
79    if (sz > stream->sm_max_write)
80        sz = stream->sm_max_write;
81    if (stream->sm_write_off + sz > stream->sm_buf_sz)
82    {
83        if (stream->sm_write_off + sz < stream->sm_buf_sz * 2)
84            stream->sm_buf_sz *= 2;
85        else
86            stream->sm_buf_sz = stream->sm_write_off + sz;
87        stream->sm_buf = realloc(stream->sm_buf, stream->sm_buf_sz);
88    }
89
90    sz = reader->lsqr_read(reader->lsqr_ctx,
91                                    stream->sm_buf + stream->sm_write_off, sz);
92    stream->sm_write_off += sz;
93
94    return sz;
95}
96
97
98#define XHDR(name_, value_) .buf = name_ value_, .name_offset = 0, .name_len = sizeof(name_) - 1, .val_offset = sizeof(name_) - 1, .val_len = sizeof(value_) - 1,
99
100
101static void
102test_chop (unsigned max_write_sz)
103{
104    struct lsquic_frame_writer *fw;
105    struct lsquic_stream *stream;
106    struct lsquic_mm mm;
107    struct lshpack_enc henc;
108    int s;
109
110#if LSQUIC_CONN_STATS
111    struct conn_stats conn_stats;
112    memset(&conn_stats, 0, sizeof(conn_stats));
113#endif
114
115    lsquic_mm_init(&mm);
116    lshpack_enc_init(&henc);
117    stream = stream_new(max_write_sz);
118
119    fw = lsquic_frame_writer_new(&mm, stream, 0, &henc, stream_write,
120#if LSQUIC_CONN_STATS
121                                 &conn_stats,
122#endif
123                                0);
124
125    struct lsxpack_header header_arr[] =
126    {
127        { XHDR(":status", "302") },
128    };
129
130    struct lsquic_http_headers headers = {
131        .count = 1,
132        .headers = header_arr,
133    };
134
135    s = lsquic_frame_writer_write_headers(fw, 12345, &headers, 0, 100);
136    assert(0 == s);
137
138    struct lsquic_http2_setting settings[] = { { 1, 2, }, { 3, 4, } };
139    s = lsquic_frame_writer_write_settings(fw, settings, 2);
140    assert(0 == s);
141
142    /* TODO: server must not send priority frames, add a check for that
143     * error condition.
144     */
145    s = lsquic_frame_writer_write_priority(fw, 3, 0, 1, 256);
146    assert(0 == s);
147
148    while (lsquic_frame_writer_have_leftovers(fw))
149    {
150        s = lsquic_frame_writer_flush(fw);
151        assert(0 == s);
152    }
153
154    const unsigned char expected_buf[] = {
155        /* Length: */       0x00, 0x00, 0x09,
156        /* Type: */         HTTP_FRAME_HEADERS,
157        /* Flags: */        HFHF_END_HEADERS|HFHF_PRIORITY,
158        /* Stream Id: */    0x00, 0x00, 0x30, 0x39,
159        /* Dep stream id: */0x00, 0x00, 0x00, 0x00,
160        /* Weight: */       100 - 1,
161        /* Block fragment: */
162                            0x48, 0x82, 0x64, 0x02,
163        /* Length: */       0x00, 0x00, 0x0C,
164        /* Type: */         HTTP_FRAME_SETTINGS,
165        /* Flags: */        0x00,
166        /* Stream Id: */    0x00, 0x00, 0x00, 0x00,
167        /* Payload: */      0x00, 0x01, 0x00, 0x00, 0x00, 0x02,
168                            0x00, 0x03, 0x00, 0x00, 0x00, 0x04,
169        /* Length: */       0x00, 0x00, 5,
170        /* Type: */         HTTP_FRAME_PRIORITY,
171        /* Flags: */        0x00,
172        /* Stream Id: */    0x00, 0x00, 0x00, 0x03,
173        /* Dep stream Id: */0x00, 0x00, 0x00, 0x01,
174        /* Weight: */       0xFF,
175    };
176
177    assert(stream->sm_write_off == sizeof(expected_buf));
178    assert(0 == memcmp(stream->sm_buf, expected_buf, sizeof(expected_buf)));
179
180    lsquic_frame_writer_destroy(fw);
181    stream_destroy(stream);
182    lshpack_enc_cleanup(&henc);
183    lsquic_mm_cleanup(&mm);
184}
185
186
187int
188main (int argc, char **argv)
189{
190    const unsigned write_sizes[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20,
191                                     30, 100, 200, 255, 0xFFF, 0x1000, 0x100D,
192                                     UINT_MAX, };
193    unsigned i;
194    int opt, max_write_sz = -1;
195
196    while (-1 != (opt = getopt(argc, argv, "l:s:")))
197    {
198        switch (opt)
199        {
200        case 'l':
201            lsquic_log_to_fstream(stderr, LLTS_NONE);
202            lsquic_logger_lopt(optarg);
203            break;
204        case 's':
205            max_write_sz = atoi(optarg);
206            break;
207        default:
208            exit(1);
209        }
210    }
211
212    if (-1 == max_write_sz)
213        for (i = 0; i < sizeof(write_sizes) / sizeof(write_sizes[0]); ++i)
214            test_chop(write_sizes[i]);
215    else
216        test_chop(max_write_sz);
217
218    return 0;
219}
220