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58
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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58
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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426
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13 static ngx_int_t ngx_http_postpone_filter_add(ngx_http_request_t *r,
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14 ngx_chain_t *in);
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230
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15 static ngx_int_t ngx_http_postpone_filter_init(ngx_conf_t *cf);
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58
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16
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17
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18 static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
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19 NULL, /* preconfiguration */
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230
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20 ngx_http_postpone_filter_init, /* postconfiguration */
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58
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21
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22 NULL, /* create main configuration */
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23 NULL, /* init main configuration */
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24
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25 NULL, /* create server configuration */
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26 NULL, /* merge server configuration */
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27
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28 NULL, /* create location configuration */
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29 NULL /* merge location configuration */
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30 };
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31
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32
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33 ngx_module_t ngx_http_postpone_filter_module = {
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34 NGX_MODULE_V1,
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35 &ngx_http_postpone_filter_module_ctx, /* module context */
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36 NULL, /* module directives */
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37 NGX_HTTP_MODULE, /* module type */
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90
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38 NULL, /* init master */
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230
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39 NULL, /* init module */
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90
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40 NULL, /* init process */
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41 NULL, /* init thread */
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42 NULL, /* exit thread */
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43 NULL, /* exit process */
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44 NULL, /* exit master */
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45 NGX_MODULE_V1_PADDING
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58
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46 };
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47
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48
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49 static ngx_http_output_body_filter_pt ngx_http_next_filter;
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50
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51
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52 static ngx_int_t
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53 ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
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54 {
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426
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55 ngx_connection_t *c;
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56 ngx_http_postponed_request_t *pr;
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58
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57
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426
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58 c = r->connection;
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59
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60 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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132
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61 "http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in);
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76
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62
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426
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63 if (r != c->data) {
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58
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64
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426
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65 if (in) {
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66 ngx_http_postpone_filter_add(r, in);
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67 return NGX_OK;
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58
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68 }
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69
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426
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70 #if 0
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71 /* TODO: SSI may pass NULL */
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72 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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73 "http postpone filter NULL inactive request",
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74 &r->uri, &r->args);
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190
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75 #endif
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76
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426
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77 return NGX_OK;
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132
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78 }
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79
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80 if (r->postponed == NULL) {
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426
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81
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82 if (in || c->buffered) {
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83 return ngx_http_next_filter(r->main, in);
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84 }
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85
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86 return NGX_OK;
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87 }
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88
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89 if (in) {
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90 ngx_http_postpone_filter_add(r, in);
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132
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91 }
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92
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426
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93 do {
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94 pr = r->postponed;
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95
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96 if (pr->request) {
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97
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98 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
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99 "http postpone filter wake \"%V?%V\"",
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100 &pr->request->uri, &pr->request->args);
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101
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102 r->postponed = pr->next;
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103
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104 c->data = pr->request;
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105
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520
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106 return ngx_http_post_request(pr->request, NULL);
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426
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107 }
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132
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108
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426
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109 if (pr->out == NULL) {
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110 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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111 "http postpone filter NULL output",
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112 &r->uri, &r->args);
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113
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114 } else {
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115 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
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116 "http postpone filter output \"%V?%V\"",
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117 &r->uri, &r->args);
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58
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118
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426
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119 if (ngx_http_next_filter(r->main, pr->out) == NGX_ERROR) {
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120 return NGX_ERROR;
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121 }
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122 }
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123
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124 r->postponed = pr->next;
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125
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126 } while (r->postponed);
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127
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128 return NGX_OK;
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58
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129 }
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130
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131
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132 static ngx_int_t
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426
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133 ngx_http_postpone_filter_add(ngx_http_request_t *r, ngx_chain_t *in)
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132
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134 {
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426
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135 ngx_http_postponed_request_t *pr, **ppr;
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132
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136
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426
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137 if (r->postponed) {
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138 for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
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132
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139
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426
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140 if (pr->request == NULL) {
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141 goto found;
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132
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142 }
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143
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426
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144 ppr = &pr->next;
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132
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145
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426
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146 } else {
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147 ppr = &r->postponed;
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148 }
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144
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149
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426
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150 pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
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151 if (pr == NULL) {
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152 return NGX_ERROR;
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132
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153 }
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384
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154
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426
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155 *ppr = pr;
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384
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156
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426
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157 pr->request = NULL;
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158 pr->out = NULL;
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159 pr->next = NULL;
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160
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161 found:
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162
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163 if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_OK) {
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164 return NGX_OK;
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384
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165 }
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166
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426
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167 return NGX_ERROR;
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132
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168 }
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169
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170
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171 static ngx_int_t
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230
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172 ngx_http_postpone_filter_init(ngx_conf_t *cf)
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58
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173 {
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174 ngx_http_next_filter = ngx_http_top_body_filter;
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175 ngx_http_top_body_filter = ngx_http_postpone_filter;
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176
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177 return NGX_OK;
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178 }
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