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50
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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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230
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13 static ngx_int_t ngx_http_write_filter_init(ngx_conf_t *cf);
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50
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14
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15
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216
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16 static ngx_http_module_t ngx_http_write_filter_module_ctx = {
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58
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17 NULL, /* preconfiguration */
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230
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18 ngx_http_write_filter_init, /* 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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58
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32 NGX_MODULE_V1,
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50
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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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90
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36 NULL, /* init master */
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230
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37 NULL, /* init module */
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90
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38 NULL, /* init process */
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39 NULL, /* init thread */
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40 NULL, /* exit thread */
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41 NULL, /* exit process */
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42 NULL, /* exit master */
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43 NGX_MODULE_V1_PADDING
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50
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44 };
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45
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46
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47 ngx_int_t
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48 ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
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49 {
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300
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50 off_t size, sent, limit;
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58
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51 ngx_uint_t last, flush;
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330
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52 ngx_msec_t delay;
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58
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53 ngx_chain_t *cl, *ln, **ll, *chain;
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54 ngx_connection_t *c;
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55 ngx_http_core_loc_conf_t *clcf;
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50
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56
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76
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57 c = r->connection;
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58
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132
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59 if (c->error) {
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76
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60 return NGX_ERROR;
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61 }
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62
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63 size = 0;
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64 flush = 0;
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65 last = 0;
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58
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66 ll = &r->out;
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67
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68 /* find the size, the flush point and the last link of the saved chain */
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69
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70 for (cl = r->out; cl; cl = cl->next) {
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71 ll = &cl->next;
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72
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216
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73 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
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74 "write old buf t:%d f:%d %p, pos %p, size: %z "
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75 "file: %O, size: %z",
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76 cl->buf->temporary, cl->buf->in_file,
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77 cl->buf->start, cl->buf->pos,
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78 cl->buf->last - cl->buf->pos,
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79 cl->buf->file_pos,
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80 cl->buf->file_last - cl->buf->file_pos);
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81
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82 #if 1
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83 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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216
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84 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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85 "zero size buf in writer "
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86 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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87 cl->buf->temporary,
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88 cl->buf->recycled,
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89 cl->buf->in_file,
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90 cl->buf->start,
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91 cl->buf->pos,
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92 cl->buf->last,
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93 cl->buf->file,
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94 cl->buf->file_pos,
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95 cl->buf->file_last);
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96
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97 ngx_debug_point();
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98 return NGX_ERROR;
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99 }
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100 #endif
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101
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102 size += ngx_buf_size(cl->buf);
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103
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104 if (cl->buf->flush || cl->buf->recycled) {
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105 flush = 1;
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106 }
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107
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108 if (cl->buf->last_buf) {
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109 last = 1;
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110 }
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111 }
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112
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113 /* add the new chain to the existent one */
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114
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115 for (ln = in; ln; ln = ln->next) {
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116 cl = ngx_alloc_chain_link(r->pool);
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117 if (cl == NULL) {
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118 return NGX_ERROR;
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119 }
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120
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121 cl->buf = ln->buf;
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122 *ll = cl;
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123 ll = &cl->next;
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124
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216
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125 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
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126 "write new buf t:%d f:%d %p, pos %p, size: %z "
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127 "file: %O, size: %z",
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128 cl->buf->temporary, cl->buf->in_file,
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129 cl->buf->start, cl->buf->pos,
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130 cl->buf->last - cl->buf->pos,
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131 cl->buf->file_pos,
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132 cl->buf->file_last - cl->buf->file_pos);
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133
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134 #if 1
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135 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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216
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136 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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137 "zero size buf in writer "
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138 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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139 cl->buf->temporary,
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140 cl->buf->recycled,
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141 cl->buf->in_file,
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142 cl->buf->start,
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143 cl->buf->pos,
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144 cl->buf->last,
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145 cl->buf->file,
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146 cl->buf->file_pos,
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147 cl->buf->file_last);
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148
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149 ngx_debug_point();
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150 return NGX_ERROR;
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151 }
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152 #endif
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153
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154 size += ngx_buf_size(cl->buf);
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155
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156 if (cl->buf->flush || cl->buf->recycled) {
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157 flush = 1;
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158 }
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159
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160 if (cl->buf->last_buf) {
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161 last = 1;
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162 }
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163 }
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164
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165 *ll = NULL;
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166
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167 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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168 "http write filter: l:%d f:%d s:%O", last, flush, size);
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169
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170 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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171
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172 /*
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173 * avoid the output if there are no last buf, no flush point,
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174 * there are the incoming bufs and the size of all bufs
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175 * is smaller than "postpone_output" directive
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176 */
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177
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178 if (!last && !flush && in && size < (off_t) clcf->postpone_output) {
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179 return NGX_OK;
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180 }
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181
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182 if (c->write->delayed) {
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146
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183 c->buffered |= NGX_HTTP_WRITE_BUFFERED;
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184 return NGX_AGAIN;
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185 }
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186
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146
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187 if (size == 0 && !(c->buffered & NGX_LOWLEVEL_BUFFERED)) {
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188 if (last) {
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189 r->out = NULL;
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190 c->buffered &= ~NGX_HTTP_WRITE_BUFFERED;
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191
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192 return NGX_OK;
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193 }
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194
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195 if (flush) {
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196 do {
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197 r->out = r->out->next;
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146
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198 } while (r->out);
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199
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200 c->buffered &= ~NGX_HTTP_WRITE_BUFFERED;
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201
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202 return NGX_OK;
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203 }
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204
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205 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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206 "the http output chain is empty");
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207
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208 ngx_debug_point();
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209
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210 return NGX_ERROR;
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211 }
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212
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184
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213 if (r->limit_rate) {
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300
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214 limit = r->limit_rate * (ngx_time() - r->start_sec + 1) - c->sent;
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182
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215
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300
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216 if (limit <= 0) {
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184
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217 c->write->delayed = 1;
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216
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218 ngx_add_timer(c->write,
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219 (ngx_msec_t) (- limit * 1000 / r->limit_rate + 1));
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184
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220
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221 c->buffered |= NGX_HTTP_WRITE_BUFFERED;
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222
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223 return NGX_AGAIN;
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224 }
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225
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300
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226 } else if (clcf->sendfile_max_chunk) {
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227 limit = clcf->sendfile_max_chunk;
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228
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184
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229 } else {
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230 limit = 0;
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182
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231 }
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232
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233 sent = c->sent;
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234
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182
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235 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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236 "http write filter limit %O", limit);
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182
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237
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238 chain = c->send_chain(c, r->out, limit);
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239
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240 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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241 "http write filter %p", chain);
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242
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182
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243 if (chain == NGX_CHAIN_ERROR) {
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244 c->error = 1;
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245 return NGX_ERROR;
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246 }
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247
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300
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248 if (r->limit_rate) {
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330
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249 delay = (ngx_msec_t) ((c->sent - sent) * 1000 / r->limit_rate + 1);
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250
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251 if (delay > 0) {
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252 c->write->delayed = 1;
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253 ngx_add_timer(c->write, delay);
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254 }
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300
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255
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324
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256 } else if (c->write->ready
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257 && clcf->sendfile_max_chunk
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258 && (size_t) (c->sent - sent)
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259 >= clcf->sendfile_max_chunk - 2 * ngx_pagesize)
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324
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260 {
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261 c->write->delayed = 1;
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262 ngx_add_timer(c->write, 1);
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263 }
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264
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265 for (cl = r->out; cl && cl != chain; /* void */) {
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266 ln = cl;
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267 cl = cl->next;
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268 ngx_free_chain(r->pool, ln);
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269 }
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270
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271 r->out = chain;
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272
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273 if (chain) {
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274 c->buffered |= NGX_HTTP_WRITE_BUFFERED;
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275 return NGX_AGAIN;
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276 }
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277
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278 c->buffered &= ~NGX_HTTP_WRITE_BUFFERED;
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279
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280 if ((c->buffered & NGX_LOWLEVEL_BUFFERED) && r->postponed == NULL) {
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281 return NGX_AGAIN;
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282 }
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283
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284 return NGX_OK;
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285 }
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286
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287
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288 static ngx_int_t
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230
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289 ngx_http_write_filter_init(ngx_conf_t *cf)
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290 {
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291 ngx_http_top_body_filter = ngx_http_write_filter;
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292
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293 return NGX_OK;
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294 }
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