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509
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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583
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12 static ngx_int_t
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13 ngx_http_postpone_filter_output_postponed_request(ngx_http_request_t *r);
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509
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14 static ngx_int_t ngx_http_postpone_filter_init(ngx_cycle_t *cycle);
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15
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16
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17 static ngx_http_module_t ngx_http_postpone_filter_module_ctx = {
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18 NULL, /* preconfiguration */
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19 NULL, /* postconfiguration */
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20
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21 NULL, /* create main configuration */
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22 NULL, /* init main configuration */
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23
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24 NULL, /* create server configuration */
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25 NULL, /* merge server configuration */
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26
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27 NULL, /* create location configuration */
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28 NULL /* merge location configuration */
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29 };
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30
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31
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32 ngx_module_t ngx_http_postpone_filter_module = {
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33 NGX_MODULE_V1,
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34 &ngx_http_postpone_filter_module_ctx, /* module context */
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35 NULL, /* module directives */
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36 NGX_HTTP_MODULE, /* module type */
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541
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37 NULL, /* init master */
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509
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38 ngx_http_postpone_filter_init, /* init module */
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541
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39 NULL, /* init process */
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40 NULL, /* init thread */
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41 NULL, /* exit thread */
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42 NULL, /* exit process */
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43 NULL, /* exit master */
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44 NGX_MODULE_V1_PADDING
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509
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45 };
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46
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47
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48 static ngx_http_output_body_filter_pt ngx_http_next_filter;
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49
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50
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51 static ngx_int_t
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52 ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
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53 {
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54 ngx_int_t rc;
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55 ngx_chain_t *out;
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56 ngx_http_postponed_request_t *pr, **ppr;
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57
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583
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58 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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59 "http postpone filter \"%V?%V\" %p", &r->uri, &r->args, in);
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527
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60
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509
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61 if (r != r->connection->data || (r->postponed && in)) {
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62
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63 if (r->postponed) {
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64 for (pr = r->postponed; pr->next; pr = pr->next) { /* void */ }
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65
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66 ppr = pr->request ? &pr->next : NULL;
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67
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68 } else {
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69 ppr = &r->postponed;
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70 #if (NGX_SUPPRESS_WARN)
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71 pr = NULL;
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72 #endif
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73 }
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74
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75 if (ppr) {
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76 pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
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77 if (pr == NULL) {
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78 return NGX_ERROR;
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79 }
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80
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81 *ppr = pr;
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82
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83 pr->request = NULL;
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84 pr->out = NULL;
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85 pr->next = NULL;
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86 }
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87
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88 if (ngx_chain_add_copy(r->pool, &pr->out, in) == NGX_ERROR) {
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89 return NGX_ERROR;
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90 }
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91
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641
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92 #if 1
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93 {
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94 ngx_chain_t *cl;
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95 ngx_buf_t *b = NULL;
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96 for (cl = pr->out; cl; cl = cl->next) {
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97 if (cl->buf == b) {
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98 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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99 "the same buf was used in postponed");
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100 ngx_debug_point();
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101 return NGX_ERROR;
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102 }
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103 b = cl->buf;
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104 }
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105 }
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106 #endif
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107
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509
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108 if (r != r->connection->data || r->postponed->request) {
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109 return NGX_AGAIN;
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110 }
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111 }
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112
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113 if (r->postponed) {
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114 out = r->postponed->out;
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597
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115 if (out) {
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116 r->postponed = r->postponed->next;
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117 }
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509
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118
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119 } else {
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120 out = in;
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121 }
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122
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595
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123 rc = NGX_OK;
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124
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597
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125 if (out
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126 || (r->connection->buffered
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127 & (NGX_HTTP_LOWLEVEL_BUFFERED|NGX_LOWLEVEL_BUFFERED)))
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128 {
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595
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129
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130 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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131 "http postpone filter out \"%V?%V\"", &r->uri, &r->args);
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509
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132
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595
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133 if (!(out && out->next == NULL && ngx_buf_sync_only(out->buf))) {
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134
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135 rc = ngx_http_next_filter(r->main, out);
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509
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136
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595
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137 if (rc == NGX_ERROR) {
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138 /* NGX_ERROR may be returned by any filter */
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139 r->connection->error = 1;
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140 }
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141 }
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583
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142 }
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143
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144 if (r->postponed == NULL) {
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145 return rc;
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146 }
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147
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148 rc = ngx_http_postpone_filter_output_postponed_request(r);
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149
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150 if (rc == NGX_ERROR) {
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151 /* NGX_ERROR may be returned by any filter */
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152 r->connection->error = 1;
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509
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153 }
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154
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155 return rc;
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156 }
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157
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158
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159 static ngx_int_t
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583
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160 ngx_http_postpone_filter_output_postponed_request(ngx_http_request_t *r)
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161 {
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162 ngx_int_t rc;
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595
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163 ngx_chain_t *out;
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583
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164 ngx_http_postponed_request_t *pr;
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165
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166 for ( ;; ) {
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167 pr = r->postponed;
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168
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169 if (pr == NULL) {
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170 return NGX_OK;
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171 }
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172
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173 if (pr->request) {
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174
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175 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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176 "http postpone filter handle \"%V?%V\"",
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177 &pr->request->uri, &pr->request->args);
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178
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179 if (!pr->request->done) {
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180 r->connection->data = pr->request;
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181 return NGX_AGAIN;
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182 }
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183
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184 rc = ngx_http_postpone_filter_output_postponed_request(pr->request);
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185
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186 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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187 return rc;
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188 }
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189
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190 r->postponed = r->postponed->next;
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191 pr = r->postponed;
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192 }
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193
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597
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194 if (pr == NULL) {
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195 return NGX_OK;
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196 }
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197
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595
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198 out = pr->out;
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199
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200 if (out) {
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583
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201 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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202 "http postpone filter out postponed \"%V?%V\"",
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203 &r->uri, &r->args);
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204
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595
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205 if (!(out && out->next == NULL && ngx_buf_sync_only(out->buf))) {
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206 if (ngx_http_next_filter(r->main, out) == NGX_ERROR) {
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207 return NGX_ERROR;
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208 }
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209 }
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210 }
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211
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212 r->postponed = r->postponed->next;
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213 }
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214 }
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215
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216
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217 static ngx_int_t
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509
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218 ngx_http_postpone_filter_init(ngx_cycle_t *cycle)
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219 {
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220 ngx_http_next_filter = ngx_http_top_body_filter;
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221 ngx_http_top_body_filter = ngx_http_postpone_filter;
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222
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223 return NGX_OK;
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224 }
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