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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_event.h>
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10 #include <ngx_http.h>
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11
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12
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13 static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle);
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14
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15
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16 ngx_http_module_t ngx_http_write_filter_module_ctx = {
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17 NULL, /* preconfiguration */
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18 NULL, /* postconfiguration */
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19
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20 NULL, /* create main configuration */
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21 NULL, /* init main configuration */
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22
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23 NULL, /* create server configuration */
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24 NULL, /* merge server configuration */
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25
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26 NULL, /* create location configuration */
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27 NULL, /* merge location configuration */
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28 };
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29
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30
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31 ngx_module_t ngx_http_write_filter_module = {
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32 NGX_MODULE_V1,
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33 &ngx_http_write_filter_module_ctx, /* module context */
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34 NULL, /* module directives */
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35 NGX_HTTP_MODULE, /* module type */
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36 ngx_http_write_filter_init, /* init module */
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37 NULL /* init process */
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38 };
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39
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40
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41 ngx_int_t
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42 ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
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43 {
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58
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44 off_t size, sent;
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45 ngx_uint_t last, flush;
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46 ngx_chain_t *cl, *ln, **ll, *chain;
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47 ngx_connection_t *c;
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48 ngx_http_core_loc_conf_t *clcf;
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50
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49
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50 size = 0;
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51 flush = 0;
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52 last = 0;
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58
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53 ll = &r->out;
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50
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54
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55 /* find the size, the flush point and the last link of the saved chain */
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56
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58
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57 for (cl = r->out; cl; cl = cl->next) {
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58 ll = &cl->next;
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59
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60 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
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61 "write old buf t:%d f:%d %p, pos %p, size: %z "
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62 "file: %O, size: %z",
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63 cl->buf->temporary, cl->buf->in_file,
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64 cl->buf->start, cl->buf->pos,
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65 cl->buf->last - cl->buf->pos,
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66 cl->buf->file_pos,
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67 cl->buf->file_last - cl->buf->file_pos);
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68
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69 #if 1
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70 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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71 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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72 "zero size buf in writer "
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73 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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74 cl->buf->temporary,
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75 cl->buf->recycled,
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76 cl->buf->in_file,
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77 cl->buf->start,
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78 cl->buf->pos,
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79 cl->buf->last,
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80 cl->buf->file,
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81 cl->buf->file_pos,
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82 cl->buf->file_last);
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83
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84 ngx_debug_point();
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85 return NGX_ERROR;
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86 }
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87 #endif
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88
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89 size += ngx_buf_size(cl->buf);
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90
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91 if (cl->buf->flush || cl->buf->recycled) {
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92 flush = 1;
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93 }
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94
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95 if (cl->buf->last_buf) {
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96 last = 1;
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97 }
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98 }
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99
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100 /* add the new chain to the existent one */
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101
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102 for (ln = in; ln; ln = ln->next) {
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103 cl = ngx_alloc_chain_link(r->pool);
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104 if (cl == NULL) {
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105 return NGX_ERROR;
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106 }
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107
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108 cl->buf = ln->buf;
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109 *ll = cl;
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110 ll = &cl->next;
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111
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112 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
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113 "write new buf t:%d f:%d %p, pos %p, size: %z "
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114 "file: %O, size: %z",
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115 cl->buf->temporary, cl->buf->in_file,
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116 cl->buf->start, cl->buf->pos,
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117 cl->buf->last - cl->buf->pos,
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118 cl->buf->file_pos,
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119 cl->buf->file_last - cl->buf->file_pos);
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120
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121 #if 1
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122 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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123 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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124 "zero size buf in writer "
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125 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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126 cl->buf->temporary,
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127 cl->buf->recycled,
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128 cl->buf->in_file,
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129 cl->buf->start,
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130 cl->buf->pos,
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131 cl->buf->last,
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132 cl->buf->file,
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133 cl->buf->file_pos,
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134 cl->buf->file_last);
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135
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136 ngx_debug_point();
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137 return NGX_ERROR;
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138 }
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139 #endif
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140
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141 size += ngx_buf_size(cl->buf);
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142
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143 if (cl->buf->flush || cl->buf->recycled) {
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144 flush = 1;
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145 }
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146
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147 if (cl->buf->last_buf) {
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148 last = 1;
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149 }
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150 }
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151
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152 *ll = NULL;
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153
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154 c = r->connection;
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155
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156 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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157 "http write filter: l:%d f:%d s:%O", last, flush, size);
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158
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159 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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160
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161 /*
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162 * avoid the output if there are no last buf, no flush point,
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163 * there are the incoming bufs and the size of all bufs
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164 * is smaller than "postpone_output" directive
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165 */
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166
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167 if (!last && !flush && in && size < (off_t) clcf->postpone_output) {
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168 return NGX_OK;
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169 }
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170
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171 if (c->write->delayed) {
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172 return NGX_AGAIN;
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173 }
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174
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175 if (size == 0 && !c->buffered) {
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176 if (last) {
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177 r->out = NULL;
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178 return NGX_OK;
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179 }
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180
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181 if (flush) {
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182 do {
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183 r->out = r->out->next;
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184 }
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185 while (r->out);
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186
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187 return NGX_OK;
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188 }
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189
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190 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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191 "the http output chain is empty");
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192
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193 ngx_debug_point();
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194
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195 return NGX_ERROR;
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196 }
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197
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198 sent = c->sent;
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199
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200 chain = c->send_chain(c, r->out, clcf->limit_rate);
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201
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202 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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203 "http write filter %p", chain);
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204
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205 if (clcf->limit_rate) {
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206 sent = c->sent - sent;
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207 c->write->delayed = 1;
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208 ngx_add_timer(r->connection->write,
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209 (ngx_msec_t) (sent * 1000 / clcf->limit_rate));
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210 }
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211
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212 if (chain == NGX_CHAIN_ERROR) {
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213 return NGX_ERROR;
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214 }
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215
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216 for (cl = r->out; cl && cl != chain; /* void */) {
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217 ln = cl;
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218 cl = cl->next;
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219 ngx_free_chain(r->pool, ln);
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220 }
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221
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222 r->out = chain;
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223
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224 if (chain || c->buffered) {
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225 return NGX_AGAIN;
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226 }
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227
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228 return NGX_OK;
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229 }
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230
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231
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232 static ngx_int_t
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233 ngx_http_write_filter_init(ngx_cycle_t *cycle)
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234 {
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235 ngx_http_top_body_filter = ngx_http_write_filter;
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236
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237 return NGX_OK;
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238 }
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