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