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annotate src/http/ngx_http_spdy.h @ 5530:827e53c136b0

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SPDY: use ngx_queue_t to queue streams for post processing. It simplifies the code and allows easy reuse the same queue pointer to store streams in various queues with different requirements. Future implementation of SPDY/3.1 will take advantage of this quality.
author Valentin Bartenev <vbart@nginx.com>
date Mon, 20 Jan 2014 20:56:49 +0400
parents e4adaa47af65
children 01e2a5bcdd8f
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 2
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19
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20 #ifdef TLSEXT_TYPE_next_proto_neg
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21 #define NGX_SPDY_NPN_ADVERTISE "\x06spdy/2"
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22 #define NGX_SPDY_NPN_NEGOTIATED "spdy/2"
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23 #endif
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24
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25 #define NGX_SPDY_STATE_BUFFER_SIZE 16
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26
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27 #define NGX_SPDY_CTL_BIT 1
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28
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29 #define NGX_SPDY_SYN_STREAM 1
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30 #define NGX_SPDY_SYN_REPLY 2
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31 #define NGX_SPDY_RST_STREAM 3
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32 #define NGX_SPDY_SETTINGS 4
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33 #define NGX_SPDY_NOOP 5
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34 #define NGX_SPDY_PING 6
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35 #define NGX_SPDY_GOAWAY 7
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36 #define NGX_SPDY_HEADERS 8
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37
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38 #define NGX_SPDY_FRAME_HEADER_SIZE 8
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39
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40 #define NGX_SPDY_SID_SIZE 4
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41
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42 #define NGX_SPDY_SYN_STREAM_SIZE 10
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43 #define NGX_SPDY_SYN_REPLY_SIZE 6
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44 #define NGX_SPDY_RST_STREAM_SIZE 8
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45 #define NGX_SPDY_PING_SIZE 4
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46 #define NGX_SPDY_GOAWAY_SIZE 4
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47 #define NGX_SPDY_NV_NUM_SIZE 2
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48 #define NGX_SPDY_NV_NLEN_SIZE 2
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49 #define NGX_SPDY_NV_VLEN_SIZE 2
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50 #define NGX_SPDY_SETTINGS_NUM_SIZE 4
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51 #define NGX_SPDY_SETTINGS_IDF_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_IDF_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 3
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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 u_char buffer[NGX_SPDY_STATE_BUFFER_SIZE];
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85 size_t buffer_used;
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86 ngx_http_spdy_handler_pt handler;
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87
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88 z_stream zstream_in;
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89 z_stream zstream_out;
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90
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91 ngx_pool_t *pool;
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92
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93 ngx_http_spdy_out_frame_t *free_ctl_frames;
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94 ngx_connection_t *free_fake_connections;
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95
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96 ngx_http_spdy_stream_t **streams_index;
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97
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98 ngx_http_spdy_out_frame_t *last_out;
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99
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100 ngx_queue_t posted;
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101
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102 ngx_http_spdy_stream_t *stream;
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103
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104 ngx_uint_t entries;
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105 size_t length;
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106 u_char flags;
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107
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108 ngx_uint_t last_sid;
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109
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110 unsigned blocked:1;
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111 unsigned incomplete:1;
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112 };
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113
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114
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115 struct ngx_http_spdy_stream_s {
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116 ngx_uint_t id;
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117 ngx_http_request_t *request;
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118 ngx_http_spdy_connection_t *connection;
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119 ngx_http_spdy_stream_t *index;
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120
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121 ngx_uint_t header_buffers;
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122 ngx_uint_t queued;
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123
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124 ngx_http_spdy_out_frame_t *free_frames;
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125 ngx_chain_t *free_data_headers;
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126 ngx_chain_t *free_bufs;
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127
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128 ngx_queue_t queue;
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129
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130 unsigned priority:2;
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131 unsigned handled:1;
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132 unsigned blocked:1;
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133 unsigned in_closed:1;
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134 unsigned out_closed:1;
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135 unsigned skip_data:2;
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136 };
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137
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138
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139 struct ngx_http_spdy_out_frame_s {
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140 ngx_http_spdy_out_frame_t *next;
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141 ngx_chain_t *first;
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142 ngx_chain_t *last;
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143 ngx_int_t (*handler)(ngx_http_spdy_connection_t *sc,
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144 ngx_http_spdy_out_frame_t *frame);
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145
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146 ngx_http_spdy_stream_t *stream;
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147 size_t length;
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148
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149 ngx_uint_t priority;
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150 unsigned blocked:1;
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151 unsigned fin:1;
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152 };
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153
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154
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155 static ngx_inline void
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156 ngx_http_spdy_queue_frame(ngx_http_spdy_connection_t *sc,
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157 ngx_http_spdy_out_frame_t *frame)
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158 {
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159 ngx_http_spdy_out_frame_t **out;
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160
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161 for (out = &sc->last_out; *out; out = &(*out)->next)
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162 {
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163 if (frame->priority >= (*out)->priority) {
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164 break;
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165 }
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166 }
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167
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168 frame->next = *out;
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169 *out = frame;
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170 }
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171
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172
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173 static ngx_inline void
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174 ngx_http_spdy_queue_blocked_frame(ngx_http_spdy_connection_t *sc,
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175 ngx_http_spdy_out_frame_t *frame)
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176 {
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177 ngx_http_spdy_out_frame_t **out;
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178
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179 for (out = &sc->last_out; *out; out = &(*out)->next)
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180 {
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181 if ((*out)->blocked) {
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182 break;
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183 }
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184 }
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185
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186 frame->next = *out;
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187 *out = frame;
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188 }
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189
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190
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191 void ngx_http_spdy_init(ngx_event_t *rev);
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192 void ngx_http_spdy_request_headers_init(void);
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193
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194 ngx_int_t ngx_http_spdy_read_request_body(ngx_http_request_t *r,
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195 ngx_http_client_body_handler_pt post_handler);
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196
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197 void ngx_http_spdy_close_stream(ngx_http_spdy_stream_t *stream, ngx_int_t rc);
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198
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199 ngx_int_t ngx_http_spdy_send_output_queue(ngx_http_spdy_connection_t *sc);
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200
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201
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202 #define ngx_spdy_frame_aligned_write_uint16(p, s) \
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203 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t))
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204
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205 #define ngx_spdy_frame_aligned_write_uint32(p, s) \
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206 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t))
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207
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208 #if (NGX_HAVE_NONALIGNED)
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209
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210 #define ngx_spdy_frame_write_uint16 ngx_spdy_frame_aligned_write_uint16
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211 #define ngx_spdy_frame_write_uint32 ngx_spdy_frame_aligned_write_uint32
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212
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213 #else
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214
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215 #define ngx_spdy_frame_write_uint16(p, s) \
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216 ((p)[0] = (u_char) (s) >> 8, (p)[1] = (u_char) (s), (p) + sizeof(uint16_t))
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217
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218 #define ngx_spdy_frame_write_uint32(p, s) \
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219 ((p)[0] = (u_char) (s) >> 24, \
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220 (p)[1] = (u_char) (s) >> 16, \
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221 (p)[2] = (u_char) (s) >> 8, \
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222 (p)[3] = (u_char) (s), (p) + sizeof(uint32_t))
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223
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224 #endif
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225
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226
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227 #define ngx_spdy_ctl_frame_head(t) \
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228 ((uint32_t) NGX_SPDY_CTL_BIT << 31 | NGX_SPDY_VERSION << 16 | (t))
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229
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230 #define ngx_spdy_frame_write_head(p, t) \
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231 ngx_spdy_frame_aligned_write_uint32(p, ngx_spdy_ctl_frame_head(t))
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232
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233 #define ngx_spdy_frame_write_flags_and_len(p, f, l) \
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234 ngx_spdy_frame_aligned_write_uint32(p, (f) << 24 | (l))
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235
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236 #define ngx_spdy_frame_write_sid ngx_spdy_frame_aligned_write_uint32
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237
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238 #endif /* _NGX_HTTP_SPDY_H_INCLUDED_ */