Mercurial > hg > nginx
annotate src/core/ngx_output_chain.c @ 647:95d7da23ea53 release-0.3.45
nginx-0.3.45-RELEASE import
*) Feature: the "ssl_verify_client", "ssl_verify_depth", and
"ssl_client_certificate" directives.
*) Change: the $request_method variable now returns the main request
method.
*) Change: the ° symbol codes were changed in koi-win conversion
table.
*) Feature: the euro and N symbols were added to koi-win conversion
table.
*) Bugfix: if nginx distributed the requests among several backends and
some backend failed, then requests intended for this backend was
directed to one live backend only instead of being distributed among
the rest.
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sat, 06 May 2006 16:28:56 +0000 |
| parents | 9262f520ce21 |
| children | 597c83dad983 |
| rev | line source |
|---|---|
|
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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 |
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11 |
| 469 | 12 #if 0 |
| 13 #define NGX_SENDFILE_LIMIT 4096 | |
| 14 #endif | |
| 15 | |
| 16 | |
| 17 #define NGX_NONE 1 | |
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18 |
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19 |
| 467 | 20 static ngx_inline ngx_int_t |
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21 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf); |
| 469 | 22 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool, |
| 499 | 23 ngx_chain_t **chain, ngx_chain_t *in); |
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24 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, |
| 499 | 25 ngx_uint_t sendfile); |
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26 |
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27 |
| 499 | 28 ngx_int_t |
| 29 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in) | |
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30 { |
| 473 | 31 off_t bsize; |
| 32 size_t size; | |
| 597 | 33 ngx_int_t rc, last; |
| 34 ngx_uint_t recycled; | |
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35 ngx_chain_t *cl, *out, **last_out; |
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36 |
| 455 | 37 if (ctx->in == NULL && ctx->busy == NULL) { |
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38 |
| 469 | 39 /* |
| 40 * the short path for the case when the ctx->in and ctx->busy chains | |
| 41 * are empty, the incoming chain is empty too or has the single buf | |
| 42 * that does not require the copy | |
| 43 */ | |
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44 |
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45 if (in == NULL) { |
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46 return ctx->output_filter(ctx->filter_ctx, in); |
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47 } |
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48 |
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49 if (in->next == NULL |
| 469 | 50 #if (NGX_SENDFILE_LIMIT) |
| 51 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT) | |
| 52 #endif | |
| 509 | 53 && !ngx_output_chain_need_to_copy(ctx, in->buf)) |
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54 { |
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55 return ctx->output_filter(ctx->filter_ctx, in); |
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56 } |
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57 } |
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58 |
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59 /* add the incoming buf to the chain ctx->in */ |
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60 |
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61 if (in) { |
| 469 | 62 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) { |
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63 return NGX_ERROR; |
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64 } |
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65 } |
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66 |
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67 out = NULL; |
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68 last_out = &out; |
| 499 | 69 last = NGX_NONE; |
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70 |
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71 for ( ;; ) { |
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72 |
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73 while (ctx->in) { |
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74 |
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75 /* |
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76 * cycle while there are the ctx->in bufs |
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77 * or there are the free output bufs to copy in |
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78 */ |
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79 |
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80 bsize = ngx_buf_size(ctx->in->buf); |
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81 |
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82 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) { |
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83 |
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84 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0, |
| 483 | 85 "zero size buf in output " |
| 86 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
| 87 ctx->in->buf->temporary, | |
| 88 ctx->in->buf->recycled, | |
| 89 ctx->in->buf->in_file, | |
| 90 ctx->in->buf->start, | |
| 91 ctx->in->buf->pos, | |
| 92 ctx->in->buf->last, | |
| 93 ctx->in->buf->file, | |
| 94 ctx->in->buf->file_pos, | |
| 95 ctx->in->buf->file_last); | |
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96 |
| 473 | 97 ngx_debug_point(); |
| 98 | |
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99 ctx->in = ctx->in->next; |
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100 |
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101 continue; |
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102 } |
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103 |
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104 if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) { |
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105 |
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106 /* move the chain link to the output chain */ |
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107 |
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108 cl = ctx->in; |
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109 ctx->in = cl->next; |
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110 |
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111 *last_out = cl; |
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112 last_out = &cl->next; |
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113 cl->next = NULL; |
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114 |
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115 continue; |
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116 } |
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117 |
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118 if (ctx->buf == NULL) { |
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119 |
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120 /* get the free buf */ |
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121 |
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122 if (ctx->free) { |
| 507 | 123 cl = ctx->free; |
| 124 ctx->buf = cl->buf; | |
| 125 ctx->free = cl->next; | |
| 126 ngx_free_chain(ctx->pool, cl); | |
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127 |
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128 } else if (out || ctx->allocated == ctx->bufs.num) { |
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129 |
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130 break; |
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131 |
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132 } else { |
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133 |
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134 size = ctx->bufs.size; |
| 597 | 135 recycled = 1; |
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136 |
| 509 | 137 if (ctx->in->buf->last_in_chain) { |
|
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138 |
| 473 | 139 if (bsize < (off_t) ctx->bufs.size) { |
|
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140 |
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141 /* |
|
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142 * allocate small temp buf for the small last buf |
|
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143 * or its small last part |
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144 */ |
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145 |
| 473 | 146 size = (size_t) bsize; |
| 597 | 147 recycled = 0; |
|
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148 |
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149 } else if (ctx->bufs.num == 1 |
| 473 | 150 && (bsize < (off_t) (ctx->bufs.size |
| 151 + (ctx->bufs.size >> 2)))) | |
|
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152 { |
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153 /* |
|
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154 * allocate a temp buf that equals |
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155 * to the last buf if the last buf size is lesser |
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156 * than 1.25 of bufs.size and a temp buf is single |
|
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157 */ |
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158 |
| 473 | 159 size = (size_t) bsize; |
| 597 | 160 recycled = 0; |
|
160
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161 } |
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162 } |
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163 |
| 501 | 164 ctx->buf = ngx_create_temp_buf(ctx->pool, size); |
| 165 if (ctx->buf == NULL) { | |
|
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166 return NGX_ERROR; |
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167 } |
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168 |
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169 ctx->buf->tag = ctx->tag; |
| 597 | 170 ctx->buf->recycled = recycled; |
|
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171 ctx->allocated++; |
|
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172 } |
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173 } |
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174 |
|
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175 rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf, |
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176 ctx->sendfile); |
|
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177 |
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178 if (rc == NGX_ERROR) { |
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179 return rc; |
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180 } |
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181 |
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182 if (rc == NGX_AGAIN) { |
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183 if (out) { |
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184 break; |
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185 } |
|
430
1fa5daf7558e
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408
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186 |
|
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187 return rc; |
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188 } |
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189 |
|
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190 /* delete the completed buf from the ctx->in chain */ |
|
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191 |
|
343
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192 if (ngx_buf_size(ctx->in->buf) == 0) { |
|
160
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193 ctx->in = ctx->in->next; |
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194 } |
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195 |
| 501 | 196 cl = ngx_alloc_chain_link(ctx->pool); |
| 197 if (cl == NULL) { | |
| 461 | 198 return NGX_ERROR; |
| 199 } | |
| 501 | 200 |
| 461 | 201 cl->buf = ctx->buf; |
| 202 cl->next = NULL; | |
|
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203 *last_out = cl; |
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204 last_out = &cl->next; |
|
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205 ctx->buf = NULL; |
|
160
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206 } |
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207 |
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208 if (out == NULL && last != NGX_NONE) { |
| 509 | 209 |
| 210 if (ctx->in) { | |
| 211 return NGX_AGAIN; | |
| 212 } | |
| 213 | |
|
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214 return last; |
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215 } |
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216 |
|
294
5cfd65b8b0a7
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291
diff
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217 last = ctx->output_filter(ctx->filter_ctx, out); |
|
160
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218 |
| 569 | 219 if (last == NGX_ERROR || last == NGX_DONE) { |
| 220 return last; | |
| 221 } | |
| 222 | |
|
160
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223 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag); |
|
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224 last_out = &out; |
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225 } |
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226 } |
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227 |
|
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228 |
| 467 | 229 static ngx_inline ngx_int_t |
| 499 | 230 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf) |
|
160
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231 { |
| 469 | 232 ngx_uint_t sendfile; |
| 233 | |
|
343
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234 if (ngx_buf_special(buf)) { |
|
160
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235 return 0; |
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236 } |
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|
237 |
| 469 | 238 sendfile = ctx->sendfile; |
| 239 | |
| 240 #if (NGX_SENDFILE_LIMIT) | |
| 241 | |
| 242 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) { | |
| 243 sendfile = 0; | |
| 244 } | |
| 245 | |
| 246 #endif | |
| 247 | |
| 248 if (!sendfile) { | |
| 455 | 249 |
|
343
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250 if (!ngx_buf_in_memory(buf)) { |
|
170
c42be4185301
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parents:
167
diff
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251 return 1; |
|
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167
diff
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252 } |
|
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167
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|
253 |
|
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254 buf->in_file = 0; |
|
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255 } |
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|
256 |
|
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|
257 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) { |
|
160
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258 return 1; |
|
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259 } |
|
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260 |
|
343
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|
261 if (ctx->need_in_temp && (buf->memory || buf->mmap)) { |
|
160
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262 return 1; |
|
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|
263 } |
|
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parents:
diff
changeset
|
264 |
|
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265 return 0; |
|
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|
266 } |
|
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parents:
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changeset
|
267 |
|
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parents:
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|
268 |
| 499 | 269 static ngx_int_t |
| 270 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, | |
| 271 ngx_chain_t *in) | |
| 469 | 272 { |
| 273 ngx_chain_t *cl, **ll; | |
| 274 #if (NGX_SENDFILE_LIMIT) | |
| 275 ngx_buf_t *b, *buf; | |
| 276 #endif | |
| 277 | |
| 278 ll = chain; | |
| 279 | |
| 280 for (cl = *chain; cl; cl = cl->next) { | |
| 281 ll = &cl->next; | |
| 282 } | |
| 283 | |
| 284 while (in) { | |
| 285 | |
| 501 | 286 cl = ngx_alloc_chain_link(pool); |
| 287 if (cl == NULL) { | |
| 469 | 288 return NGX_ERROR; |
| 289 } | |
| 290 | |
| 291 #if (NGX_SENDFILE_LIMIT) | |
| 292 | |
| 293 buf = in->buf; | |
| 294 | |
| 295 if (buf->in_file | |
| 296 && buf->file_pos < NGX_SENDFILE_LIMIT | |
| 297 && buf->file_last > NGX_SENDFILE_LIMIT) | |
| 298 { | |
| 501 | 299 b = ngx_calloc_buf(pool); |
| 300 if (b == NULL) { | |
| 469 | 301 return NGX_ERROR; |
| 302 } | |
| 303 | |
| 304 ngx_memcpy(b, buf, sizeof(ngx_buf_t)); | |
| 305 | |
| 306 if (ngx_buf_in_memory(buf)) { | |
| 307 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos); | |
| 308 b->last = buf->pos; | |
| 309 } | |
| 310 | |
| 311 buf->file_pos = NGX_SENDFILE_LIMIT; | |
| 312 b->file_last = NGX_SENDFILE_LIMIT; | |
| 313 | |
| 314 cl->buf = b; | |
| 315 | |
| 316 } else { | |
| 317 cl->buf = buf; | |
| 318 in = in->next; | |
| 319 } | |
| 320 | |
| 321 #else | |
| 322 cl->buf = in->buf; | |
| 323 in = in->next; | |
| 324 | |
| 325 #endif | |
| 326 | |
| 327 *ll = cl; | |
| 328 ll = &cl->next; | |
| 329 } | |
| 330 | |
| 331 *ll = NULL; | |
| 332 | |
| 333 return NGX_OK; | |
| 334 } | |
| 335 | |
| 336 | |
| 499 | 337 static ngx_int_t |
| 338 ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, ngx_uint_t sendfile) | |
|
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339 { |
| 473 | 340 off_t size; |
|
194
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341 ssize_t n; |
|
160
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342 |
|
343
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343 size = ngx_buf_size(src); |
|
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344 |
| 473 | 345 if (size > dst->end - dst->pos) { |
|
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346 size = dst->end - dst->pos; |
|
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347 } |
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348 |
| 469 | 349 #if (NGX_SENDFILE_LIMIT) |
| 350 | |
| 351 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) { | |
| 352 sendfile = 0; | |
| 353 } | |
| 354 | |
| 355 #endif | |
| 356 | |
|
343
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357 if (ngx_buf_in_memory(src)) { |
| 473 | 358 ngx_memcpy(dst->pos, src->pos, (size_t) size); |
| 359 src->pos += (size_t) size; | |
| 360 dst->last += (size_t) size; | |
|
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361 |
| 455 | 362 if (src->in_file) { |
| 363 | |
| 364 if (sendfile) { | |
| 365 dst->in_file = 1; | |
| 366 dst->file = src->file; | |
| 367 dst->file_pos = src->file_pos; | |
| 368 dst->file_last = src->file_pos + size; | |
| 369 | |
| 370 } else { | |
| 371 dst->in_file = 0; | |
| 372 } | |
| 373 | |
|
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374 src->file_pos += size; |
| 452 | 375 |
| 376 } else { | |
| 377 dst->in_file = 0; | |
|
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378 } |
|
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379 |
|
343
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380 if (src->last_buf && src->pos == src->last) { |
|
6bdf858bff8c
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381 dst->last_buf = 1; |
|
160
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382 } |
|
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|
383 |
|
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384 } else { |
| 473 | 385 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos); |
|
160
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|
386 |
|
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387 if (n == NGX_ERROR) { |
| 517 | 388 return (ngx_int_t) n; |
|
160
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389 } |
|
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parents:
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changeset
|
390 |
|
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parents:
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|
391 #if (NGX_FILE_AIO_READ) |
|
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392 if (n == NGX_AGAIN) { |
| 517 | 393 return (ngx_int_t) n; |
|
160
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394 } |
|
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395 #endif |
|
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396 |
| 473 | 397 if (n != size) { |
|
160
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398 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0, |
| 473 | 399 ngx_read_file_n " reads only %z of %O from file", |
|
160
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|
400 n, size); |
|
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parents:
diff
changeset
|
401 if (n == 0) { |
|
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parents:
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402 return NGX_ERROR; |
|
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parents:
diff
changeset
|
403 } |
|
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Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
404 } |
|
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Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
405 |
|
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parents:
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changeset
|
406 dst->last += n; |
|
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parents:
diff
changeset
|
407 |
| 452 | 408 if (sendfile) { |
| 409 dst->in_file = 1; | |
| 410 dst->file = src->file; | |
| 411 dst->file_pos = src->file_pos; | |
| 455 | 412 dst->file_last = src->file_pos + n; |
| 452 | 413 |
| 414 } else { | |
|
343
6bdf858bff8c
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parents:
334
diff
changeset
|
415 dst->in_file = 0; |
|
160
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parents:
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|
416 } |
|
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parents:
diff
changeset
|
417 |
| 455 | 418 src->file_pos += n; |
| 419 | |
|
343
6bdf858bff8c
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parents:
334
diff
changeset
|
420 if (src->last_buf && src->file_pos == src->file_last) { |
|
6bdf858bff8c
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parents:
334
diff
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|
421 dst->last_buf = 1; |
|
160
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parents:
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|
422 } |
|
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parents:
diff
changeset
|
423 } |
|
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Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
424 |
|
e7e094d34162
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parents:
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changeset
|
425 return NGX_OK; |
|
e7e094d34162
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parents:
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|
426 } |
|
162
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parents:
160
diff
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|
427 |
|
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428 |
| 499 | 429 ngx_int_t |
| 430 ngx_chain_writer(void *data, ngx_chain_t *in) | |
|
162
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160
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|
431 { |
|
166
389d7ee9fa60
nginx-0.0.1-2003-10-30-11:51:06 import
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parents:
164
diff
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|
432 ngx_chain_writer_ctx_t *ctx = data; |
|
162
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433 |
| 473 | 434 off_t size; |
|
162
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160
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|
435 ngx_chain_t *cl; |
|
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|
436 |
| 473 | 437 for (size = 0; in; in = in->next) { |
| 438 | |
| 439 #if 1 | |
| 440 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) { | |
| 441 ngx_debug_point(); | |
| 442 } | |
| 443 #endif | |
| 444 | |
| 445 size += ngx_buf_size(in->buf); | |
|
408
d6e2b445c1b8
nginx-0.0.10-2004-08-27-19:40:59 import
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parents:
403
diff
changeset
|
446 |
|
d6e2b445c1b8
nginx-0.0.10-2004-08-27-19:40:59 import
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parents:
403
diff
changeset
|
447 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0, |
| 461 | 448 "chain writer buf size: %uz", ngx_buf_size(in->buf)); |
|
408
d6e2b445c1b8
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parents:
403
diff
changeset
|
449 |
| 501 | 450 cl = ngx_alloc_chain_link(ctx->pool); |
| 451 if (cl == NULL) { | |
| 461 | 452 return NGX_ERROR; |
| 453 } | |
| 501 | 454 |
| 461 | 455 cl->buf = in->buf; |
| 456 cl->next = NULL; | |
|
162
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457 *ctx->last = cl; |
|
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|
458 ctx->last = &cl->next; |
|
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459 } |
|
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parents:
160
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|
460 |
|
291
117ccc7c4055
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257
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|
461 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0, |
| 461 | 462 "chain writer in: %p", ctx->out); |
|
291
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|
463 |
| 473 | 464 for (cl = ctx->out; cl; cl = cl->next) { |
| 465 | |
| 466 #if 1 | |
| 467 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { | |
| 468 ngx_debug_point(); | |
| 469 } | |
| 470 | |
| 471 #endif | |
| 472 | |
| 473 size += ngx_buf_size(cl->buf); | |
| 474 } | |
| 475 | |
| 476 if (size == 0) { | |
| 477 return NGX_OK; | |
| 478 } | |
| 479 | |
| 577 | 480 ctx->out = ctx->connection->send_chain(ctx->connection, ctx->out, |
| 481 ctx->limit); | |
|
162
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160
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|
482 |
|
291
117ccc7c4055
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257
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|
483 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0, |
| 461 | 484 "chain writer out: %p", ctx->out); |
|
291
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257
diff
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|
485 |
|
162
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parents:
160
diff
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|
486 if (ctx->out == NGX_CHAIN_ERROR) { |
|
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parents:
160
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|
487 return NGX_ERROR; |
|
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parents:
160
diff
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|
488 } |
|
96993d4d5067
nginx-0.0.1-2003-10-28-00:01:00 import
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parents:
160
diff
changeset
|
489 |
|
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nginx-0.0.1-2003-10-28-00:01:00 import
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parents:
160
diff
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|
490 if (ctx->out == NULL) { |
|
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491 ctx->last = &ctx->out; |
|
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|
492 return NGX_OK; |
|
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nginx-0.0.1-2003-10-28-00:01:00 import
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parents:
160
diff
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|
493 } |
|
96993d4d5067
nginx-0.0.1-2003-10-28-00:01:00 import
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parents:
160
diff
changeset
|
494 |
|
96993d4d5067
nginx-0.0.1-2003-10-28-00:01:00 import
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parents:
160
diff
changeset
|
495 return NGX_AGAIN; |
|
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nginx-0.0.1-2003-10-28-00:01:00 import
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parents:
160
diff
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|
496 } |