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annotate src/http/ngx_http_spdy.h @ 5493:916cb6d28f6a

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SPDY: fixed possible request hang. Processing events from upstream connection can result in sending queued frames from other streams. In this case such streams were not added to handling queue and properly handled. A global per connection flag was replaced by a per stream flag that indicates currently sending stream while all other streams can be added to handling queue.
author Valentin Bartenev <vbart@nginx.com>
date Thu, 26 Dec 2013 17:03:16 +0400
parents 620808518349
children 9053fdcea4b7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 ngx_http_spdy_stream_t *last_stream;
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100
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101 ngx_http_spdy_stream_t *stream;
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102
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103 ngx_uint_t headers;
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104 size_t length;
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105 u_char flags;
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106
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107 ngx_uint_t last_sid;
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108
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109 unsigned blocked:1;
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110 unsigned waiting:1; /* FIXME better name */
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111 };
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112
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113
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114 struct ngx_http_spdy_stream_s {
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115 ngx_uint_t id;
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116 ngx_http_request_t *request;
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117 ngx_http_spdy_connection_t *connection;
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118 ngx_http_spdy_stream_t *index;
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119 ngx_http_spdy_stream_t *next;
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120
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121 ngx_uint_t header_buffers;
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122 ngx_uint_t waiting;
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123 ngx_http_spdy_out_frame_t *free_frames;
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124 ngx_chain_t *free_data_headers;
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125
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126 unsigned priority:2;
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127 unsigned handled:1;
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128 unsigned blocked:1;
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129 unsigned in_closed:1;
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130 unsigned out_closed:1;
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131 unsigned skip_data:2;
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132 };
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133
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134
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135 struct ngx_http_spdy_out_frame_s {
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136 ngx_http_spdy_out_frame_t *next;
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137 ngx_chain_t *first;
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138 ngx_chain_t *last;
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139 ngx_int_t (*handler)(ngx_http_spdy_connection_t *sc,
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140 ngx_http_spdy_out_frame_t *frame);
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141
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142 ngx_http_spdy_out_frame_t *free;
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143
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144 ngx_http_spdy_stream_t *stream;
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145 size_t size;
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146
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147 ngx_uint_t priority;
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148 unsigned blocked:1;
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149 unsigned fin:1;
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150 };
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151
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152
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153 static ngx_inline void
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154 ngx_http_spdy_queue_frame(ngx_http_spdy_connection_t *sc,
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155 ngx_http_spdy_out_frame_t *frame)
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156 {
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157 ngx_http_spdy_out_frame_t **out;
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158
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159 for (out = &sc->last_out; *out; out = &(*out)->next)
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160 {
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161 if (frame->priority >= (*out)->priority) {
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162 break;
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163 }
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164 }
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165
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166 frame->next = *out;
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167 *out = frame;
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168 }
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169
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170
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171 static ngx_inline void
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172 ngx_http_spdy_queue_blocked_frame(ngx_http_spdy_connection_t *sc,
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173 ngx_http_spdy_out_frame_t *frame)
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174 {
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175 ngx_http_spdy_out_frame_t **out;
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176
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177 for (out = &sc->last_out; *out; out = &(*out)->next)
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178 {
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179 if ((*out)->blocked) {
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180 break;
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181 }
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182 }
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183
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184 frame->next = *out;
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185 *out = frame;
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186 }
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187
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188
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189 void ngx_http_spdy_init(ngx_event_t *rev);
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190 void ngx_http_spdy_request_headers_init(void);
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191
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192 ngx_int_t ngx_http_spdy_read_request_body(ngx_http_request_t *r,
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193 ngx_http_client_body_handler_pt post_handler);
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194
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195 void ngx_http_spdy_close_stream(ngx_http_spdy_stream_t *stream, ngx_int_t rc);
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196
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197 ngx_int_t ngx_http_spdy_send_output_queue(ngx_http_spdy_connection_t *sc);
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198
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199
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200 #define ngx_spdy_frame_aligned_write_uint16(p, s) \
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201 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t))
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202
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203 #define ngx_spdy_frame_aligned_write_uint32(p, s) \
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204 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t))
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205
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206 #if (NGX_HAVE_NONALIGNED)
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207
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208 #define ngx_spdy_frame_write_uint16 ngx_spdy_frame_aligned_write_uint16
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209 #define ngx_spdy_frame_write_uint32 ngx_spdy_frame_aligned_write_uint32
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210
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211 #else
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212
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213 #define ngx_spdy_frame_write_uint16(p, s) \
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214 ((p)[0] = (u_char) (s) >> 8, (p)[1] = (u_char) (s), (p) + sizeof(uint16_t))
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215
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216 #define ngx_spdy_frame_write_uint32(p, s) \
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217 ((p)[0] = (u_char) (s) >> 24, \
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218 (p)[1] = (u_char) (s) >> 16, \
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219 (p)[2] = (u_char) (s) >> 8, \
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220 (p)[3] = (u_char) (s), (p) + sizeof(uint32_t))
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221
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222 #endif
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223
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224
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225 #define ngx_spdy_ctl_frame_head(t) \
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226 ((uint32_t) NGX_SPDY_CTL_BIT << 31 | NGX_SPDY_VERSION << 16 | (t))
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227
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228 #define ngx_spdy_frame_write_head(p, t) \
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229 ngx_spdy_frame_aligned_write_uint32(p, ngx_spdy_ctl_frame_head(t))
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230
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231 #define ngx_spdy_frame_write_flags_and_len(p, f, l) \
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232 ngx_spdy_frame_aligned_write_uint32(p, (f) << 24 | (l))
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233
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234 #define ngx_spdy_frame_write_sid ngx_spdy_frame_aligned_write_uint32
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235
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236 #endif /* _NGX_HTTP_SPDY_H_INCLUDED_ */