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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
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12 #define NGX_NONE 1
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13
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14
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15 ngx_inline static ngx_int_t
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16 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
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17 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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18 ngx_uint_t sendfile);
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19
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20
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21 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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22 {
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23 int rc, last;
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24 size_t size, bsize;
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25 ngx_chain_t *cl, *out, **last_out;
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26
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27 /*
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28 * the short path for the case when the ctx->in chain is empty
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29 * and the incoming chain is empty too or it has the single buf
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30 * that does not require the copy
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31 */
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32
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33 if (ctx->in == NULL) {
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34
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35 if (in == NULL) {
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36 return ctx->output_filter(ctx->filter_ctx, in);
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37 }
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38
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39 if (in->next == NULL
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40 && (!ngx_output_chain_need_to_copy(ctx, in->buf)))
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41 {
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42 return ctx->output_filter(ctx->filter_ctx, in);
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43 }
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44 }
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45
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46 /* add the incoming buf to the chain ctx->in */
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47
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48 if (in) {
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49 if (ngx_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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50 return NGX_ERROR;
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51 }
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52 }
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53
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54 last = NGX_NONE;
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55 out = NULL;
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56 last_out = &out;
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57
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58 for ( ;; ) {
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59
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60 while (ctx->in) {
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61
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62 /*
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63 * cycle while there are the ctx->in bufs
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64 * or there are the free output bufs to copy in
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65 */
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66
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67 bsize = ngx_buf_size(ctx->in->buf);
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68
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69 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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70
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71 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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72 "zero size buf");
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73
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74 ctx->in = ctx->in->next;
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75
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76 continue;
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77 }
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78
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79 if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) {
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80
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81 /* move the chain link to the output chain */
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82
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83 cl = ctx->in;
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84 ctx->in = cl->next;
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85
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86 *last_out = cl;
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87 last_out = &cl->next;
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88 cl->next = NULL;
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89
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90 continue;
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91 }
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92
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93 if (ctx->buf == NULL) {
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94
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95 /* get the free buf */
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96
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97 if (ctx->free) {
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98 ctx->buf = ctx->free->buf;
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99 ctx->free = ctx->free->next;
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100
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101 } else if (out || ctx->allocated == ctx->bufs.num) {
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102
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103 break;
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104
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105 } else {
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106
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107 size = ctx->bufs.size;
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108
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109 if (ctx->in->buf->last_buf) {
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110
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111 if (bsize < ctx->bufs.size) {
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112
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113 /*
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114 * allocate small temp buf for the small last buf
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115 * or its small last part
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116 */
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117
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118 size = bsize;
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119
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120 } else if (ctx->bufs.num == 1
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121 && (bsize < ctx->bufs.size
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122 + (ctx->bufs.size >> 2)))
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123 {
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124 /*
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125 * allocate a temp buf that equals
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126 * to the last buf if the last buf size is lesser
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127 * than 1.25 of bufs.size and a temp buf is single
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128 */
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129
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130 size = bsize;
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131 }
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132 }
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133
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134 if (!(ctx->buf = ngx_create_temp_buf(ctx->pool, size))) {
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135 return NGX_ERROR;
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136 }
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137
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138 ctx->buf->tag = ctx->tag;
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139 ctx->buf->recycled = 1;
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140 ctx->allocated++;
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141 }
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142 }
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143
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144 rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf,
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145 ctx->sendfile);
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146
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147 if (rc == NGX_ERROR) {
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148 return rc;
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149 }
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150
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151 if (rc == NGX_AGAIN) {
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152 if (out) {
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153 break;
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154 }
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155
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156 return rc;
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157 }
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158
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159 /* delete the completed buf from the ctx->in chain */
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160
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161 if (ngx_buf_size(ctx->in->buf) == 0) {
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162 ctx->in = ctx->in->next;
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163 }
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164
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165 ngx_alloc_link_and_set_buf(cl, ctx->buf, ctx->pool, NGX_ERROR);
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166 *last_out = cl;
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167 last_out = &cl->next;
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168 ctx->buf = NULL;
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169 }
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170
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171 if (out == NULL && last != NGX_NONE) {
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172 return last;
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173 }
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174
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175 last = ctx->output_filter(ctx->filter_ctx, out);
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176
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177 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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178 last_out = &out;
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179
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180 if (last == NGX_ERROR) {
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181 return last;
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182 }
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183 }
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184 }
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185
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186
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187 ngx_inline static ngx_int_t
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188 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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189 {
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190 if (ngx_buf_special(buf)) {
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191 return 0;
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192 }
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193
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194 if (!ctx->sendfile) {
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195 if (!ngx_buf_in_memory(buf)) {
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196 return 1;
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197 }
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198
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199 buf->in_file = 0;
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200 }
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201
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202 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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203 return 1;
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204 }
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205
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206 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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207 return 1;
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208 }
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209
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210 return 0;
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211 }
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212
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213
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214 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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215 ngx_uint_t sendfile)
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216 {
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217 size_t size;
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218 ssize_t n;
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219
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220 size = ngx_buf_size(src);
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221
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222 if (size > (size_t) (dst->end - dst->pos)) {
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223 size = dst->end - dst->pos;
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224 }
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225
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226 if (ngx_buf_in_memory(src)) {
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227 ngx_memcpy(dst->pos, src->pos, size);
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228 src->pos += size;
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229 dst->last += size;
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230
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231 if (src->in_file) {
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232 src->file_pos += size;
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233 }
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234
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235 if (src->last_buf && src->pos == src->last) {
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236 dst->last_buf = 1;
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237 }
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238
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239 } else {
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240 n = ngx_read_file(src->file, dst->pos, size, src->file_pos);
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241
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242 if (n == NGX_ERROR) {
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243 return n;
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244 }
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245
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246 #if (NGX_FILE_AIO_READ)
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247 if (n == NGX_AGAIN) {
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248 return n;
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249 }
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250 #endif
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251
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252 if ((size_t) n != size) {
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253 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
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254 ngx_read_file_n " reads only %d of %d from file",
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255 n, size);
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256 if (n == 0) {
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257 return NGX_ERROR;
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258 }
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259 }
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260
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261 src->file_pos += n;
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262 dst->last += n;
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263
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264 if (!sendfile) {
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265 dst->in_file = 0;
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266 }
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267
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268 if (src->last_buf && src->file_pos == src->file_last) {
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269 dst->last_buf = 1;
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270 }
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271 }
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272
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273 return NGX_OK;
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274 }
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275
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276
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277 ngx_int_t ngx_chain_writer(void *data, ngx_chain_t *in)
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278 {
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279 ngx_chain_writer_ctx_t *ctx = data;
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280
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281 ngx_chain_t *cl;
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282
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283
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284 for (/* void */; in; in = in->next) {
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285
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286 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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287 "WRITER buf: %d", ngx_buf_size(in->buf));
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288
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289 ngx_alloc_link_and_set_buf(cl, in->buf, ctx->pool, NGX_ERROR);
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290 *ctx->last = cl;
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291 ctx->last = &cl->next;
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292 }
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293
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294 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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295 "WRITER0: %X", ctx->out);
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296
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297 ctx->out = ngx_send_chain(ctx->connection, ctx->out, ctx->limit);
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298
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299 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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300 "WRITER1: %X", ctx->out);
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301
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302 if (ctx->out == NGX_CHAIN_ERROR) {
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303 return NGX_ERROR;
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304 }
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305
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306 if (ctx->out == NULL) {
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307 ctx->last = &ctx->out;
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308 return NGX_OK;
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309 }
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310
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311 return NGX_AGAIN;
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312 }
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