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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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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
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46 ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
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47 {
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48 off_t size, sent;
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49 ngx_uint_t last, flush;
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50 ngx_chain_t *cl, *ln, **ll, *chain;
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51 ngx_connection_t *c;
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52 ngx_http_core_loc_conf_t *clcf;
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53 ngx_http_write_filter_ctx_t *ctx;
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54
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55 ctx = ngx_http_get_module_ctx(r->main ? r->main : r,
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56 ngx_http_write_filter_module);
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57
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58 if (ctx == NULL) {
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59
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60 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_write_filter_ctx_t));
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61 if (ctx == NULL) {
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62 return NGX_ERROR;
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63 }
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64
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65 ngx_http_set_ctx(r, ctx, ngx_http_write_filter_module);
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66 }
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67
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68 size = 0;
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69 flush = 0;
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70 last = 0;
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71 ll = &ctx->out;
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72
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73 /* find the size, the flush point and the last link of the saved chain */
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74
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75 for (cl = ctx->out; cl; cl = cl->next) {
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76 ll = &cl->next;
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77
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78 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
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79 "write old buf t:%d f:%d %p, pos %p, size: %z "
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80 "file: %O, size: %z",
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81 cl->buf->temporary, cl->buf->in_file,
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82 cl->buf->start, cl->buf->pos,
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83 cl->buf->last - cl->buf->pos,
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84 cl->buf->file_pos,
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85 cl->buf->file_last - cl->buf->file_pos);
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86
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87 #if 1
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88 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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89 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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90 "zero size buf in writer "
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91 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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92 cl->buf->temporary,
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93 cl->buf->recycled,
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94 cl->buf->in_file,
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95 cl->buf->start,
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96 cl->buf->pos,
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97 cl->buf->last,
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98 cl->buf->file,
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99 cl->buf->file_pos,
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100 cl->buf->file_last);
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101
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102 ngx_debug_point();
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103 return NGX_ERROR;
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104 }
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105 #endif
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106
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107 size += ngx_buf_size(cl->buf);
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108
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109 if (cl->buf->flush || cl->buf->recycled) {
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110 flush = 1;
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111 }
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112
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113 if (cl->buf->last_buf) {
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114 last = 1;
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115 }
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116 }
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117
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118 /* add the new chain to the existent one */
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119
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120 for (ln = in; ln; ln = ln->next) {
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121 cl = ngx_alloc_chain_link(r->pool);
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122 if (cl == NULL) {
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123 return NGX_ERROR;
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124 }
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125
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126 cl->buf = ln->buf;
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127 *ll = cl;
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128 ll = &cl->next;
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129
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130 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
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131 "write new buf t:%d f:%d %p, pos %p, size: %z "
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132 "file: %O, size: %z",
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133 cl->buf->temporary, cl->buf->in_file,
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134 cl->buf->start, cl->buf->pos,
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135 cl->buf->last - cl->buf->pos,
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136 cl->buf->file_pos,
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137 cl->buf->file_last - cl->buf->file_pos);
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138
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139 #if 1
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140 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
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141 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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142 "zero size buf in writer "
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143 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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144 cl->buf->temporary,
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145 cl->buf->recycled,
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146 cl->buf->in_file,
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147 cl->buf->start,
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148 cl->buf->pos,
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149 cl->buf->last,
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150 cl->buf->file,
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151 cl->buf->file_pos,
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152 cl->buf->file_last);
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153
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154 ngx_debug_point();
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155 return NGX_ERROR;
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156 }
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157 #endif
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158
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159 size += ngx_buf_size(cl->buf);
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160
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161 if (cl->buf->flush || cl->buf->recycled) {
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162 flush = 1;
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163 }
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164
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165 if (cl->buf->last_buf) {
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166 last = 1;
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167 }
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168 }
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169
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170 *ll = NULL;
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171
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172 c = r->connection;
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173
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174 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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175 "http write filter: l:%d f:%d s:%O", last, flush, size);
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176
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177 clcf = ngx_http_get_module_loc_conf(r->main ? r->main : r,
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178 ngx_http_core_module);
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179
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180 /*
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181 * avoid the output if there is no last buf, no flush point,
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182 * there are the incoming bufs and the size of all bufs
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183 * is smaller than "postpone_output" directive
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184 */
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185
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186 if (!last && !flush && in && size < (off_t) clcf->postpone_output) {
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187 return NGX_OK;
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188 }
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189
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190 if (c->write->delayed) {
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191 return NGX_AGAIN;
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192 }
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193
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194 if (size == 0 && !c->buffered) {
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195 if (last) {
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196 return NGX_OK;
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197 }
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198
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199 if (flush) {
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200 do {
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201 ctx->out = ctx->out->next;
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202 }
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203 while (ctx->out);
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204
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205 return NGX_OK;
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206 }
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207
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208 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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209 "the http output chain is empty");
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210
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211 ngx_debug_point();
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212
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213 return NGX_ERROR;
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214 }
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215
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216 sent = c->sent;
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217
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218 chain = c->send_chain(c, ctx->out, clcf->limit_rate);
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219
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220 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
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221 "http write filter %p", chain);
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222
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223 if (clcf->limit_rate) {
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224 sent = c->sent - sent;
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225 c->write->delayed = 1;
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226 ngx_add_timer(r->connection->write,
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227 (ngx_msec_t) (sent * 1000 / clcf->limit_rate));
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228 }
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229
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230 if (chain == NGX_CHAIN_ERROR) {
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231 return NGX_ERROR;
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232 }
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233
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234 for (cl = ctx->out; cl && cl != chain; /* void */) {
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235 ln = cl;
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236 cl = cl->next;
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237 ngx_free_chain(r->pool, ln);
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238 }
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239
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50
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240 ctx->out = chain;
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241
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242 if (chain || (last && c->buffered)) {
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243 return NGX_AGAIN;
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244 }
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245
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246 return NGX_OK;
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247 }
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248
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249
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250 static ngx_int_t
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251 ngx_http_write_filter_init(ngx_cycle_t *cycle)
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252 {
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253 ngx_http_top_body_filter = ngx_http_write_filter;
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254
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255 return NGX_OK;
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256 }
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