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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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47 int last;
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48 off_t size, flush, sent;
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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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72 size += ngx_buf_size(cl->buf);
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73
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74 if (cl->buf->flush || cl->buf->recycled) {
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75 flush = size;
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76 }
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77
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78 if (cl->buf->last_buf) {
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79 last = 1;
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80 }
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81 }
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82
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83 /* add the new chain to the existent one */
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84
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85 for (ln = in; ln; ln = ln->next) {
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86 ngx_alloc_link_and_set_buf(cl, ln->buf, r->pool, NGX_ERROR);
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87 *ll = cl;
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88 ll = &cl->next;
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89
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90 size += ngx_buf_size(cl->buf);
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91
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92 if (cl->buf->flush || cl->buf->recycled) {
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93 flush = size;
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94 }
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95
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96 if (cl->buf->last_buf) {
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97 last = 1;
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98 }
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99 }
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100
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101 c = r->connection;
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102
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103 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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104 "http write filter: l:%d f:" OFF_T_FMT " s:" OFF_T_FMT,
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105 last, flush, size);
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106
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107 clcf = ngx_http_get_module_loc_conf(r->main ? r->main : r,
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108 ngx_http_core_module);
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109
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110 /*
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111 * avoid the output if there is no last buf, no flush point,
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112 * there are the incoming bufs and the size of all bufs
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113 * is smaller than "postpone_output" directive
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114 */
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115
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116 if (!last && flush == 0 && in && size < (off_t) clcf->postpone_output) {
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117 return NGX_OK;
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118 }
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119
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120 if (c->write->delayed) {
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121 return NGX_AGAIN;
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122 }
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123
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124 if (size == 0 && !c->buffered) {
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125 if (!last) {
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126 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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127 "the http output chain is empty");
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4
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128 return NGX_ERROR;
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0
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129 }
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130 return NGX_OK;
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131 }
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132
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133 sent = c->sent;
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134
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135 chain = c->send_chain(c, ctx->out,
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136 clcf->limit_rate ? clcf->limit_rate: OFF_T_MAX_VALUE);
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137
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138 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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139 "http write filter %X", chain);
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140
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141 if (clcf->limit_rate) {
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142 sent = c->sent - sent;
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143 c->write->delayed = 1;
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144 ngx_add_timer(r->connection->write,
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145 (ngx_msec_t) (sent * 1000 / clcf->limit_rate));
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146 }
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147
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148 if (chain == NGX_CHAIN_ERROR) {
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149 return NGX_ERROR;
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150 }
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151
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152 ctx->out = chain;
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153
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154 if (chain || c->buffered) {
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155 return NGX_AGAIN;
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156 }
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157
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158 return NGX_OK;
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159 }
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160
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161
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162 static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle)
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163 {
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164 ngx_http_top_body_filter = ngx_http_write_filter;
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165
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166 return NGX_OK;
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167 }
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