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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
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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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16
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15 static ngx_inline ngx_int_t
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0
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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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4
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27 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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28
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4
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29 /*
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30 * the short path for the case when the ctx->in and ctx->busy chains
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31 * are empty, the incoming chain is empty too or has the single buf
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32 * that does not require the copy
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33 */
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0
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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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10
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165 if (!(cl = ngx_alloc_chain_link(ctx->pool))) {
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166 return NGX_ERROR;
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167 }
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168 cl->buf = ctx->buf;
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169 cl->next = NULL;
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0
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170 *last_out = cl;
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171 last_out = &cl->next;
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172 ctx->buf = NULL;
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173 }
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174
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175 if (out == NULL && last != NGX_NONE) {
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176 return last;
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177 }
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178
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179 last = ctx->output_filter(ctx->filter_ctx, out);
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180
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181 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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182 last_out = &out;
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183
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184 if (last == NGX_ERROR) {
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185 return last;
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186 }
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187 }
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188 }
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189
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190
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16
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191 static ngx_inline ngx_int_t
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0
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192 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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193 {
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194 if (ngx_buf_special(buf)) {
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195 return 0;
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196 }
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197
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198 if (!ctx->sendfile) {
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4
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199
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0
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200 if (!ngx_buf_in_memory(buf)) {
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201 return 1;
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202 }
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203
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204 buf->in_file = 0;
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205 }
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206
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207 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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208 return 1;
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209 }
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210
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211 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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212 return 1;
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213 }
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214
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215 return 0;
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216 }
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217
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218
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219 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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220 ngx_uint_t sendfile)
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221 {
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222 size_t size;
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223 ssize_t n;
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224
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225 size = ngx_buf_size(src);
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226
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227 if (size > (size_t) (dst->end - dst->pos)) {
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228 size = dst->end - dst->pos;
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229 }
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230
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231 if (ngx_buf_in_memory(src)) {
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232 ngx_memcpy(dst->pos, src->pos, size);
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233 src->pos += size;
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234 dst->last += size;
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235
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4
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236 if (src->in_file) {
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237
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238 if (sendfile) {
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239 dst->in_file = 1;
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240 dst->file = src->file;
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241 dst->file_pos = src->file_pos;
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242 dst->file_last = src->file_pos + size;
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243
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244 } else {
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245 dst->in_file = 0;
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246 }
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247
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0
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248 src->file_pos += size;
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2
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249
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250 } else {
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251 dst->in_file = 0;
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0
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252 }
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253
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254 if (src->last_buf && src->pos == src->last) {
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255 dst->last_buf = 1;
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256 }
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257
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258 } else {
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259 n = ngx_read_file(src->file, dst->pos, size, src->file_pos);
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260
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261 if (n == NGX_ERROR) {
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262 return n;
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263 }
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264
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265 #if (NGX_FILE_AIO_READ)
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266 if (n == NGX_AGAIN) {
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267 return n;
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268 }
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269 #endif
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270
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271 if ((size_t) n != size) {
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272 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
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10
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273 ngx_read_file_n " reads only %z of %uz from file",
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0
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274 n, size);
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275 if (n == 0) {
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276 return NGX_ERROR;
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277 }
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278 }
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279
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280 dst->last += n;
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281
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2
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282 if (sendfile) {
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283 dst->in_file = 1;
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284 dst->file = src->file;
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285 dst->file_pos = src->file_pos;
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4
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286 dst->file_last = src->file_pos + n;
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2
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287
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288 } else {
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0
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289 dst->in_file = 0;
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290 }
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291
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4
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292 src->file_pos += n;
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293
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0
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294 if (src->last_buf && src->file_pos == src->file_last) {
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295 dst->last_buf = 1;
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296 }
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297 }
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298
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299 return NGX_OK;
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300 }
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301
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302
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303 ngx_int_t ngx_chain_writer(void *data, ngx_chain_t *in)
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304 {
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305 ngx_chain_writer_ctx_t *ctx = data;
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306
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307 ngx_chain_t *cl;
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308
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309
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310 for (/* void */; in; in = in->next) {
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311
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312 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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10
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313 "chain writer buf size: %uz", ngx_buf_size(in->buf));
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0
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314
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10
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315 if (!(cl = ngx_alloc_chain_link(ctx->pool))) {
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316 return NGX_ERROR;
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317 }
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318 cl->buf = in->buf;
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319 cl->next = NULL;
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0
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320 *ctx->last = cl;
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321 ctx->last = &cl->next;
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322 }
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323
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324 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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10
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325 "chain writer in: %p", ctx->out);
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0
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326
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327 ctx->out = ngx_send_chain(ctx->connection, ctx->out, ctx->limit);
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328
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329 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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10
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330 "chain writer out: %p", ctx->out);
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0
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331
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332 if (ctx->out == NGX_CHAIN_ERROR) {
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333 return NGX_ERROR;
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334 }
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335
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336 if (ctx->out == NULL) {
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337 ctx->last = &ctx->out;
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338 return NGX_OK;
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339 }
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340
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341 return NGX_AGAIN;
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342 }
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