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annotate src/http/ngx_http_spdy.h @ 6059:c81d79a7befd

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SPDY: always push pending data. This helps to avoid suboptimal behavior when a client waits for a control frame or more data to increase window size, but the frames have been delayed in the socket buffer. The delays can be caused by bad interaction between Nagle's algorithm on nginx side and delayed ACK on the client side or by TCP_CORK/TCP_NOPUSH if SPDY was working without SSL and sendfile() was used. The pushing code is now very similar to ngx_http_set_keepalive().
author Valentin Bartenev <vbart@nginx.com>
date Mon, 23 Mar 2015 21:04:13 +0300
parents 34d460c5d186
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (C) Nginx, Inc.
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3 * Copyright (C) Valentin V. Bartenev
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4 */
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5
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6
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7 #ifndef _NGX_HTTP_SPDY_H_INCLUDED_
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8 #define _NGX_HTTP_SPDY_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_http.h>
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14
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15 #include <zlib.h>
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16
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17
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18 #define NGX_SPDY_VERSION 3
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19
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20 #define NGX_SPDY_NPN_ADVERTISE "\x08spdy/3.1"
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21 #define NGX_SPDY_NPN_NEGOTIATED "spdy/3.1"
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22
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23 #define NGX_SPDY_STATE_BUFFER_SIZE 16
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24
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25 #define NGX_SPDY_CTL_BIT 1
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26
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27 #define NGX_SPDY_SYN_STREAM 1
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28 #define NGX_SPDY_SYN_REPLY 2
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29 #define NGX_SPDY_RST_STREAM 3
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30 #define NGX_SPDY_SETTINGS 4
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31 #define NGX_SPDY_PING 6
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32 #define NGX_SPDY_GOAWAY 7
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33 #define NGX_SPDY_HEADERS 8
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34 #define NGX_SPDY_WINDOW_UPDATE 9
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35
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36 #define NGX_SPDY_FRAME_HEADER_SIZE 8
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37
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38 #define NGX_SPDY_SID_SIZE 4
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39 #define NGX_SPDY_DELTA_SIZE 4
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40
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41 #define NGX_SPDY_SYN_STREAM_SIZE 10
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42 #define NGX_SPDY_SYN_REPLY_SIZE 4
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43 #define NGX_SPDY_RST_STREAM_SIZE 8
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44 #define NGX_SPDY_PING_SIZE 4
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45 #define NGX_SPDY_GOAWAY_SIZE 8
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46 #define NGX_SPDY_WINDOW_UPDATE_SIZE 8
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47 #define NGX_SPDY_NV_NUM_SIZE 4
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48 #define NGX_SPDY_NV_NLEN_SIZE 4
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49 #define NGX_SPDY_NV_VLEN_SIZE 4
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50 #define NGX_SPDY_SETTINGS_NUM_SIZE 4
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51 #define NGX_SPDY_SETTINGS_FID_SIZE 4
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52 #define NGX_SPDY_SETTINGS_VAL_SIZE 4
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53
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54 #define NGX_SPDY_SETTINGS_PAIR_SIZE \
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55 (NGX_SPDY_SETTINGS_FID_SIZE + NGX_SPDY_SETTINGS_VAL_SIZE)
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56
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57 #define NGX_SPDY_HIGHEST_PRIORITY 0
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58 #define NGX_SPDY_LOWEST_PRIORITY 7
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59
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60 #define NGX_SPDY_FLAG_FIN 0x01
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61 #define NGX_SPDY_FLAG_UNIDIRECTIONAL 0x02
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62 #define NGX_SPDY_FLAG_CLEAR_SETTINGS 0x01
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63
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64 #define NGX_SPDY_MAX_FRAME_SIZE ((1 << 24) - 1)
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65
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66 #define NGX_SPDY_DATA_DISCARD 1
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67 #define NGX_SPDY_DATA_ERROR 2
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68 #define NGX_SPDY_DATA_INTERNAL_ERROR 3
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69
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70
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71 typedef struct ngx_http_spdy_connection_s ngx_http_spdy_connection_t;
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72 typedef struct ngx_http_spdy_out_frame_s ngx_http_spdy_out_frame_t;
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73
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74
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75 typedef u_char *(*ngx_http_spdy_handler_pt) (ngx_http_spdy_connection_t *sc,
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76 u_char *pos, u_char *end);
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77
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78 struct ngx_http_spdy_connection_s {
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79 ngx_connection_t *connection;
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80 ngx_http_connection_t *http_connection;
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81
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82 ngx_uint_t processing;
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83
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84 size_t send_window;
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85 size_t recv_window;
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86 size_t init_window;
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87
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88 ngx_queue_t waiting;
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89
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90 u_char buffer[NGX_SPDY_STATE_BUFFER_SIZE];
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91 size_t buffer_used;
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92 ngx_http_spdy_handler_pt handler;
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93
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94 z_stream zstream_in;
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95 z_stream zstream_out;
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96
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97 ngx_pool_t *pool;
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98
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99 ngx_http_spdy_out_frame_t *free_ctl_frames;
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100 ngx_connection_t *free_fake_connections;
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101
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102 ngx_http_spdy_stream_t **streams_index;
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103
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104 ngx_http_spdy_out_frame_t *last_out;
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105
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106 ngx_queue_t posted;
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107
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108 ngx_http_spdy_stream_t *stream;
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109
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110 ngx_uint_t entries;
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111 size_t length;
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112 u_char flags;
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113
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114 ngx_uint_t last_sid;
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115
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116 unsigned blocked:1;
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117 unsigned incomplete:1;
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118 };
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119
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120
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121 struct ngx_http_spdy_stream_s {
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122 ngx_uint_t id;
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123 ngx_http_request_t *request;
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124 ngx_http_spdy_connection_t *connection;
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125 ngx_http_spdy_stream_t *index;
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126
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127 ngx_uint_t header_buffers;
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128 ngx_uint_t queued;
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129
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130 /*
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131 * A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the
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132 * send_window to become negative, hence it's signed.
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133 */
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134 ssize_t send_window;
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diff changeset
135 size_t recv_window;
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diff changeset
136
5121
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137 ngx_http_spdy_out_frame_t *free_frames;
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diff changeset
138 ngx_chain_t *free_data_headers;
5514
b7ee1bae0ffa SPDY: implemented buffers chain splitting.
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diff changeset
139 ngx_chain_t *free_bufs;
5121
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diff changeset
140
5530
827e53c136b0 SPDY: use ngx_queue_t to queue streams for post processing.
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diff changeset
141 ngx_queue_t queue;
827e53c136b0 SPDY: use ngx_queue_t to queue streams for post processing.
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diff changeset
142
5549
39d7eef2e332 SPDY: protocol implementation switched to spdy/3.1.
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diff changeset
143 unsigned priority:3;
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diff changeset
144 unsigned handled:1;
5493
916cb6d28f6a SPDY: fixed possible request hang.
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diff changeset
145 unsigned blocked:1;
5549
39d7eef2e332 SPDY: protocol implementation switched to spdy/3.1.
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diff changeset
146 unsigned exhausted:1;
5121
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diff changeset
147 unsigned in_closed:1;
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parents:
diff changeset
148 unsigned out_closed:1;
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parents:
diff changeset
149 unsigned skip_data:2;
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parents:
diff changeset
150 };
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parents:
diff changeset
151
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parents:
diff changeset
152
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parents:
diff changeset
153 struct ngx_http_spdy_out_frame_s {
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diff changeset
154 ngx_http_spdy_out_frame_t *next;
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parents:
diff changeset
155 ngx_chain_t *first;
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parents:
diff changeset
156 ngx_chain_t *last;
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diff changeset
157 ngx_int_t (*handler)(ngx_http_spdy_connection_t *sc,
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diff changeset
158 ngx_http_spdy_out_frame_t *frame);
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parents:
diff changeset
159
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diff changeset
160 ngx_http_spdy_stream_t *stream;
5529
e4adaa47af65 SPDY: store the length of frame instead of its whole size.
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parents: 5528
diff changeset
161 size_t length;
5121
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diff changeset
162
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diff changeset
163 ngx_uint_t priority;
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diff changeset
164 unsigned blocked:1;
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parents:
diff changeset
165 unsigned fin:1;
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diff changeset
166 };
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parents:
diff changeset
167
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parents:
diff changeset
168
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parents:
diff changeset
169 static ngx_inline void
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diff changeset
170 ngx_http_spdy_queue_frame(ngx_http_spdy_connection_t *sc,
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parents:
diff changeset
171 ngx_http_spdy_out_frame_t *frame)
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parents:
diff changeset
172 {
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diff changeset
173 ngx_http_spdy_out_frame_t **out;
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diff changeset
174
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diff changeset
175 for (out = &sc->last_out; *out; out = &(*out)->next)
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diff changeset
176 {
5576
2bc609a4b516 SPDY: fixed reversed priority order in window waiting queue.
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diff changeset
177 /*
2bc609a4b516 SPDY: fixed reversed priority order in window waiting queue.
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178 * NB: higher values represent lower priorities.
2bc609a4b516 SPDY: fixed reversed priority order in window waiting queue.
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179 */
5121
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180 if (frame->priority >= (*out)->priority) {
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diff changeset
181 break;
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diff changeset
182 }
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diff changeset
183 }
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parents:
diff changeset
184
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diff changeset
185 frame->next = *out;
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diff changeset
186 *out = frame;
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diff changeset
187 }
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parents:
diff changeset
188
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parents:
diff changeset
189
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diff changeset
190 static ngx_inline void
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diff changeset
191 ngx_http_spdy_queue_blocked_frame(ngx_http_spdy_connection_t *sc,
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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diff changeset
192 ngx_http_spdy_out_frame_t *frame)
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diff changeset
193 {
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diff changeset
194 ngx_http_spdy_out_frame_t **out;
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diff changeset
195
5405
620808518349 SPDY: ignore priority when queuing blocked frames.
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196 for (out = &sc->last_out; *out; out = &(*out)->next)
5121
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diff changeset
197 {
5405
620808518349 SPDY: ignore priority when queuing blocked frames.
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198 if ((*out)->blocked) {
5121
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diff changeset
199 break;
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diff changeset
200 }
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parents:
diff changeset
201 }
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parents:
diff changeset
202
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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diff changeset
203 frame->next = *out;
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diff changeset
204 *out = frame;
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diff changeset
205 }
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
206
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
207
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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diff changeset
208 void ngx_http_spdy_init(ngx_event_t *rev);
5225
15a7deeaa19a Use "void" for functions with empty parameter list.
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parents: 5121
diff changeset
209 void ngx_http_spdy_request_headers_init(void);
5121
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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diff changeset
210
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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diff changeset
211 ngx_int_t ngx_http_spdy_read_request_body(ngx_http_request_t *r,
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
212 ngx_http_client_body_handler_pt post_handler);
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
213
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
214 void ngx_http_spdy_close_stream(ngx_http_spdy_stream_t *stream, ngx_int_t rc);
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
215
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
216 ngx_int_t ngx_http_spdy_send_output_queue(ngx_http_spdy_connection_t *sc);
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
217
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
218
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
219 #define ngx_spdy_frame_aligned_write_uint16(p, s) \
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
220 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t))
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
221
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
222 #define ngx_spdy_frame_aligned_write_uint32(p, s) \
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
223 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t))
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
224
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
225 #if (NGX_HAVE_NONALIGNED)
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
226
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
227 #define ngx_spdy_frame_write_uint16 ngx_spdy_frame_aligned_write_uint16
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
228 #define ngx_spdy_frame_write_uint32 ngx_spdy_frame_aligned_write_uint32
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
229
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
230 #else
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parents:
diff changeset
231
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
232 #define ngx_spdy_frame_write_uint16(p, s) \
5716
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
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parents: 5576
diff changeset
233 ((p)[0] = (u_char) ((s) >> 8), \
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
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parents: 5576
diff changeset
234 (p)[1] = (u_char) (s), \
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
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parents: 5576
diff changeset
235 (p) + sizeof(uint16_t))
5121
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
236
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
237 #define ngx_spdy_frame_write_uint32(p, s) \
5716
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
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parents: 5576
diff changeset
238 ((p)[0] = (u_char) ((s) >> 24), \
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
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parents: 5576
diff changeset
239 (p)[1] = (u_char) ((s) >> 16), \
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
Valentin Bartenev <vbart@nginx.com>
parents: 5576
diff changeset
240 (p)[2] = (u_char) ((s) >> 8), \
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
Valentin Bartenev <vbart@nginx.com>
parents: 5576
diff changeset
241 (p)[3] = (u_char) (s), \
34d460c5d186 SPDY: fixed operator precedence in uint16/uint32 write macros.
Valentin Bartenev <vbart@nginx.com>
parents: 5576
diff changeset
242 (p) + sizeof(uint32_t))
5121
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parents:
diff changeset
243
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
Valentin Bartenev <vbart@nginx.com>
parents:
diff changeset
244 #endif
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
245
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
246
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
247 #define ngx_spdy_ctl_frame_head(t) \
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
248 ((uint32_t) NGX_SPDY_CTL_BIT << 31 | NGX_SPDY_VERSION << 16 | (t))
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
249
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
Valentin Bartenev <vbart@nginx.com>
parents:
diff changeset
250 #define ngx_spdy_frame_write_head(p, t) \
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
251 ngx_spdy_frame_aligned_write_uint32(p, ngx_spdy_ctl_frame_head(t))
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
252
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
Valentin Bartenev <vbart@nginx.com>
parents:
diff changeset
253 #define ngx_spdy_frame_write_flags_and_len(p, f, l) \
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
254 ngx_spdy_frame_aligned_write_uint32(p, (f) << 24 | (l))
5549
39d7eef2e332 SPDY: protocol implementation switched to spdy/3.1.
Valentin Bartenev <vbart@nginx.com>
parents: 5545
diff changeset
255 #define ngx_spdy_frame_write_flags_and_id(p, f, i) \
39d7eef2e332 SPDY: protocol implementation switched to spdy/3.1.
Valentin Bartenev <vbart@nginx.com>
parents: 5545
diff changeset
256 ngx_spdy_frame_aligned_write_uint32(p, (f) << 24 | (i))
5121
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
257
5549
39d7eef2e332 SPDY: protocol implementation switched to spdy/3.1.
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parents: 5545
diff changeset
258 #define ngx_spdy_frame_write_sid ngx_spdy_frame_aligned_write_uint32
39d7eef2e332 SPDY: protocol implementation switched to spdy/3.1.
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parents: 5545
diff changeset
259 #define ngx_spdy_frame_write_window ngx_spdy_frame_aligned_write_uint32
5121
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parents:
diff changeset
260
c0f7b94e88ba Preliminary experimental support for SPDY draft 2.
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parents:
diff changeset
261 #endif /* _NGX_HTTP_SPDY_H_INCLUDED_ */