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0
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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 typedef struct {
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14 ngx_chain_t *out;
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15 } ngx_http_write_filter_ctx_t;
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16
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17
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18 static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle);
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19
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20
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21 ngx_http_module_t ngx_http_write_filter_module_ctx = {
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22 NULL, /* pre conf */
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23
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24 NULL, /* create main configuration */
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25 NULL, /* init main configuration */
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26
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27 NULL, /* create server configuration */
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28 NULL, /* merge server configuration */
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29
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30 NULL, /* create location configuration */
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31 NULL, /* merge location configuration */
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32 };
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33
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34
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35 ngx_module_t ngx_http_write_filter_module = {
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36 NGX_MODULE,
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37 &ngx_http_write_filter_module_ctx, /* module context */
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38 NULL, /* module directives */
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39 NGX_HTTP_MODULE, /* module type */
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40 ngx_http_write_filter_init, /* init module */
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41 NULL /* init process */
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42 };
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43
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44
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45 ngx_int_t ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
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46 {
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48
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47 off_t size, sent;
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48 ngx_uint_t last, flush;
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0
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49 ngx_chain_t *cl, *ln, **ll, *chain;
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50 ngx_connection_t *c;
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51 ngx_http_core_loc_conf_t *clcf;
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52 ngx_http_write_filter_ctx_t *ctx;
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53
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54 ctx = ngx_http_get_module_ctx(r->main ? r->main : r,
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55 ngx_http_write_filter_module);
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56
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57 if (ctx == NULL) {
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58 ngx_http_create_ctx(r, ctx, ngx_http_write_filter_module,
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59 sizeof(ngx_http_write_filter_ctx_t), 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 = &ctx->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 = ctx->out; cl; cl = cl->next) {
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70 ll = &cl->next;
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71
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28
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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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10
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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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28
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83 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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32
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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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10
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96 ngx_debug_point();
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38
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97 return NGX_ERROR;
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10
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98 }
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99 #endif
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100
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0
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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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48
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104 flush = 1;
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0
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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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10
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115 if (!(cl = ngx_alloc_chain_link(r->pool))) {
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116 return NGX_ERROR;
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117 }
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118
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119 cl->buf = ln->buf;
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0
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120 *ll = cl;
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121 ll = &cl->next;
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122
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28
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123 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
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124 "write new buf t:%d f:%d %p, pos %p, size: %z "
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125 "file: %O, size: %z",
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126 cl->buf->temporary, cl->buf->in_file,
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127 cl->buf->start, cl->buf->pos,
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128 cl->buf->last - cl->buf->pos,
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129 cl->buf->file_pos,
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130 cl->buf->file_last - cl->buf->file_pos);
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131
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10
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132 #if 1
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133 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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28
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134 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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32
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135 "zero size buf in writer "
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136 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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137 cl->buf->temporary,
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138 cl->buf->recycled,
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139 cl->buf->in_file,
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140 cl->buf->start,
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141 cl->buf->pos,
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142 cl->buf->last,
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143 cl->buf->file,
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144 cl->buf->file_pos,
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145 cl->buf->file_last);
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146
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10
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147 ngx_debug_point();
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38
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148 return NGX_ERROR;
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10
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149 }
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150 #endif
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151
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0
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152 size += ngx_buf_size(cl->buf);
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153
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154 if (cl->buf->flush || cl->buf->recycled) {
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48
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155 flush = 1;
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0
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156 }
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157
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158 if (cl->buf->last_buf) {
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159 last = 1;
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160 }
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161 }
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162
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10
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163 *ll = NULL;
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164
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0
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165 c = r->connection;
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166
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167 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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48
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168 "http write filter: l:%d f:%d s:%O", last, flush, size);
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0
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169
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170 clcf = ngx_http_get_module_loc_conf(r->main ? r->main : r,
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171 ngx_http_core_module);
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172
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173 /*
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174 * avoid the output if there is no last buf, no flush point,
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175 * there are the incoming bufs and the size of all bufs
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176 * is smaller than "postpone_output" directive
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177 */
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178
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48
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179 if (!last && !flush && in && size < (off_t) clcf->postpone_output) {
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0
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180 return NGX_OK;
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181 }
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182
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183 if (c->write->delayed) {
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184 return NGX_AGAIN;
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185 }
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186
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187 if (size == 0 && !c->buffered) {
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32
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188 if (last) {
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189 return NGX_OK;
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190 }
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10
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191
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48
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192 if (flush) {
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193 while ((ctx->out = ctx->out->next)) { /* void */ }
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194 return NGX_OK;
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195 }
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196
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32
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197 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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198 "the http output chain is empty");
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10
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199
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32
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200 ngx_debug_point();
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201
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202 return NGX_ERROR;
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0
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203 }
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204
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205 sent = c->sent;
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206
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22
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207 chain = c->send_chain(c, ctx->out, clcf->limit_rate);
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0
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208
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209 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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10
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210 "http write filter %p", chain);
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0
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211
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212 if (clcf->limit_rate) {
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213 sent = c->sent - sent;
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214 c->write->delayed = 1;
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215 ngx_add_timer(r->connection->write,
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216 (ngx_msec_t) (sent * 1000 / clcf->limit_rate));
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217 }
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218
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219 if (chain == NGX_CHAIN_ERROR) {
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220 return NGX_ERROR;
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221 }
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222
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223 ctx->out = chain;
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224
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32
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225 if (chain || (last && c->buffered)) {
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0
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226 return NGX_AGAIN;
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227 }
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228
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229 return NGX_OK;
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230 }
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231
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232
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233 static ngx_int_t 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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