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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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18
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12 #if 0
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13 #define NGX_SENDFILE_LIMIT 4096
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14 #endif
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15
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16
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17 #define NGX_NONE 1
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0
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18
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19
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16
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20 static ngx_inline ngx_int_t
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0
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21 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
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18
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22 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
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23 ngx_chain_t **chain, ngx_chain_t *in);
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0
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24 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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25 ngx_uint_t sendfile);
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26
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27
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28 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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29 {
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30 int rc, last;
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22
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31 off_t bsize;
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32 size_t size;
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0
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33 ngx_chain_t *cl, *out, **last_out;
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34
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4
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35 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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36
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18
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37 /*
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38 * the short path for the case when the ctx->in and ctx->busy chains
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39 * are empty, the incoming chain is empty too or has the single buf
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40 * that does not require the copy
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41 */
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0
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42
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43 if (in == NULL) {
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44 return ctx->output_filter(ctx->filter_ctx, in);
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45 }
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46
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47 if (in->next == NULL
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18
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48 #if (NGX_SENDFILE_LIMIT)
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49 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
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50 #endif
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0
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51 && (!ngx_output_chain_need_to_copy(ctx, in->buf)))
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52 {
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53 return ctx->output_filter(ctx->filter_ctx, in);
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54 }
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55 }
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56
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57 /* add the incoming buf to the chain ctx->in */
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58
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59 if (in) {
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18
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60 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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0
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61 return NGX_ERROR;
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62 }
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63 }
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64
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65 last = NGX_NONE;
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66 out = NULL;
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67 last_out = &out;
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68
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69 for ( ;; ) {
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70
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71 while (ctx->in) {
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72
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73 /*
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74 * cycle while there are the ctx->in bufs
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75 * or there are the free output bufs to copy in
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76 */
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77
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78 bsize = ngx_buf_size(ctx->in->buf);
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79
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80 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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81
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82 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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32
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83 "zero size buf in output "
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84 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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85 ctx->in->buf->temporary,
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86 ctx->in->buf->recycled,
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87 ctx->in->buf->in_file,
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88 ctx->in->buf->start,
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89 ctx->in->buf->pos,
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90 ctx->in->buf->last,
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91 ctx->in->buf->file,
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92 ctx->in->buf->file_pos,
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93 ctx->in->buf->file_last);
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0
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94
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22
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95 ngx_debug_point();
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96
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0
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97 ctx->in = ctx->in->next;
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98
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99 continue;
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100 }
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101
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102 if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) {
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103
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104 /* move the chain link to the output chain */
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105
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106 cl = ctx->in;
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107 ctx->in = cl->next;
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108
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109 *last_out = cl;
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110 last_out = &cl->next;
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111 cl->next = NULL;
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112
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113 continue;
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114 }
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115
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116 if (ctx->buf == NULL) {
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117
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118 /* get the free buf */
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119
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120 if (ctx->free) {
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121 ctx->buf = ctx->free->buf;
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122 ctx->free = ctx->free->next;
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123
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124 } else if (out || ctx->allocated == ctx->bufs.num) {
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125
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126 break;
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127
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128 } else {
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129
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130 size = ctx->bufs.size;
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131
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132 if (ctx->in->buf->last_buf) {
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133
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22
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134 if (bsize < (off_t) ctx->bufs.size) {
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0
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135
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136 /*
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137 * allocate small temp buf for the small last buf
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138 * or its small last part
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139 */
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140
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22
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141 size = (size_t) bsize;
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0
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142
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143 } else if (ctx->bufs.num == 1
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22
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144 && (bsize < (off_t) (ctx->bufs.size
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145 + (ctx->bufs.size >> 2))))
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0
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146 {
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147 /*
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148 * allocate a temp buf that equals
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149 * to the last buf if the last buf size is lesser
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150 * than 1.25 of bufs.size and a temp buf is single
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151 */
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152
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22
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153 size = (size_t) bsize;
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0
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154 }
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155 }
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156
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157 if (!(ctx->buf = ngx_create_temp_buf(ctx->pool, size))) {
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158 return NGX_ERROR;
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159 }
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160
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161 ctx->buf->tag = ctx->tag;
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162 ctx->buf->recycled = 1;
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163 ctx->allocated++;
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164 }
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165 }
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166
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167 rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf,
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168 ctx->sendfile);
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169
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170 if (rc == NGX_ERROR) {
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171 return rc;
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172 }
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173
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174 if (rc == NGX_AGAIN) {
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175 if (out) {
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176 break;
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177 }
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178
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179 return rc;
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180 }
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181
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182 /* delete the completed buf from the ctx->in chain */
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183
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184 if (ngx_buf_size(ctx->in->buf) == 0) {
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185 ctx->in = ctx->in->next;
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186 }
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187
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10
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188 if (!(cl = ngx_alloc_chain_link(ctx->pool))) {
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189 return NGX_ERROR;
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190 }
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191 cl->buf = ctx->buf;
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192 cl->next = NULL;
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0
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193 *last_out = cl;
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194 last_out = &cl->next;
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195 ctx->buf = NULL;
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196 }
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197
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198 if (out == NULL && last != NGX_NONE) {
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199 return last;
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200 }
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201
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202 last = ctx->output_filter(ctx->filter_ctx, out);
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203
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204 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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205 last_out = &out;
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206
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207 if (last == NGX_ERROR) {
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208 return last;
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209 }
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210 }
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211 }
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212
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213
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16
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214 static ngx_inline ngx_int_t
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0
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215 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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216 {
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18
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217 ngx_uint_t sendfile;
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218
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0
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219 if (ngx_buf_special(buf)) {
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220 return 0;
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221 }
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222
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18
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223 sendfile = ctx->sendfile;
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224
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225 #if (NGX_SENDFILE_LIMIT)
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226
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227 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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228 sendfile = 0;
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229 }
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230
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231 #endif
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232
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233 if (!sendfile) {
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4
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234
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0
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235 if (!ngx_buf_in_memory(buf)) {
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236 return 1;
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237 }
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238
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239 buf->in_file = 0;
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240 }
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241
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242 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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243 return 1;
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244 }
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245
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246 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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247 return 1;
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248 }
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249
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250 return 0;
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251 }
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252
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253
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18
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254 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
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255 ngx_chain_t **chain, ngx_chain_t *in)
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256 {
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257 ngx_chain_t *cl, **ll;
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258 #if (NGX_SENDFILE_LIMIT)
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259 ngx_buf_t *b, *buf;
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260 #endif
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261
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262 ll = chain;
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263
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264 for (cl = *chain; cl; cl = cl->next) {
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265 ll = &cl->next;
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266 }
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267
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268 while (in) {
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269
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270 if (!(cl = ngx_alloc_chain_link(pool))) {
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271 return NGX_ERROR;
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272 }
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273
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274 #if (NGX_SENDFILE_LIMIT)
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275
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276 buf = in->buf;
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277
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278 if (buf->in_file
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279 && buf->file_pos < NGX_SENDFILE_LIMIT
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280 && buf->file_last > NGX_SENDFILE_LIMIT)
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281 {
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282 if (!(b = ngx_calloc_buf(pool))) {
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283 return NGX_ERROR;
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284 }
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285
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286 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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287
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288 if (ngx_buf_in_memory(buf)) {
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289 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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290 b->last = buf->pos;
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291 }
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292
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293 buf->file_pos = NGX_SENDFILE_LIMIT;
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294 b->file_last = NGX_SENDFILE_LIMIT;
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295
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296 cl->buf = b;
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297
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298 } else {
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299 cl->buf = buf;
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300 in = in->next;
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301 }
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302
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303 #else
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304 cl->buf = in->buf;
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305 in = in->next;
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306
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307 #endif
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308
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309 *ll = cl;
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310 ll = &cl->next;
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311 }
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312
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313 *ll = NULL;
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314
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315 return NGX_OK;
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316 }
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317
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318
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0
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319 static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src,
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320 ngx_uint_t sendfile)
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321 {
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22
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322 off_t size;
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0
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323 ssize_t n;
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324
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325 size = ngx_buf_size(src);
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326
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22
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327 if (size > dst->end - dst->pos) {
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0
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328 size = dst->end - dst->pos;
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329 }
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330
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18
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331 #if (NGX_SENDFILE_LIMIT)
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332
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333 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
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334 sendfile = 0;
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335 }
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336
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337 #endif
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338
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0
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339 if (ngx_buf_in_memory(src)) {
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22
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340 ngx_memcpy(dst->pos, src->pos, (size_t) size);
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341 src->pos += (size_t) size;
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342 dst->last += (size_t) size;
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0
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343
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4
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344 if (src->in_file) {
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345
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346 if (sendfile) {
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347 dst->in_file = 1;
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348 dst->file = src->file;
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349 dst->file_pos = src->file_pos;
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350 dst->file_last = src->file_pos + size;
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351
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352 } else {
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353 dst->in_file = 0;
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354 }
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355
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0
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356 src->file_pos += size;
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2
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357
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358 } else {
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359 dst->in_file = 0;
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0
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360 }
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361
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362 if (src->last_buf && src->pos == src->last) {
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363 dst->last_buf = 1;
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364 }
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365
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366 } else {
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22
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367 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
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0
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368
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369 if (n == NGX_ERROR) {
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370 return n;
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371 }
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372
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373 #if (NGX_FILE_AIO_READ)
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374 if (n == NGX_AGAIN) {
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375 return n;
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376 }
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377 #endif
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378
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22
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379 if (n != size) {
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0
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380 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
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22
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381 ngx_read_file_n " reads only %z of %O from file",
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0
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382 n, size);
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383 if (n == 0) {
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384 return NGX_ERROR;
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385 }
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386 }
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387
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388 dst->last += n;
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389
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2
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390 if (sendfile) {
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391 dst->in_file = 1;
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392 dst->file = src->file;
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393 dst->file_pos = src->file_pos;
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4
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394 dst->file_last = src->file_pos + n;
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2
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395
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396 } else {
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0
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397 dst->in_file = 0;
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398 }
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399
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4
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400 src->file_pos += n;
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401
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0
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402 if (src->last_buf && src->file_pos == src->file_last) {
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403 dst->last_buf = 1;
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404 }
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405 }
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406
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407 return NGX_OK;
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408 }
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409
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410
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411 ngx_int_t ngx_chain_writer(void *data, ngx_chain_t *in)
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412 {
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413 ngx_chain_writer_ctx_t *ctx = data;
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414
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22
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415 off_t size;
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0
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416 ngx_chain_t *cl;
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417
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418
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22
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419 for (size = 0; in; in = in->next) {
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420
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421 #if 1
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422 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
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423 ngx_debug_point();
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424 }
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425 #endif
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426
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427 size += ngx_buf_size(in->buf);
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0
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428
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429 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
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10
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430 "chain writer buf size: %uz", ngx_buf_size(in->buf));
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0
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431
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10
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432 if (!(cl = ngx_alloc_chain_link(ctx->pool))) {
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433 return NGX_ERROR;
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434 }
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435 cl->buf = in->buf;
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436 cl->next = NULL;
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0
|
437 *ctx->last = cl;
|
|
|
438 ctx->last = &cl->next;
|
|
|
439 }
|
|
|
440
|
|
|
441 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
|
|
10
|
442 "chain writer in: %p", ctx->out);
|
|
0
|
443
|
|
22
|
444 for (cl = ctx->out; cl; cl = cl->next) {
|
|
|
445
|
|
|
446 #if 1
|
|
|
447
|
|
|
448 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
|
449 ngx_debug_point();
|
|
|
450 }
|
|
|
451
|
|
|
452 #endif
|
|
|
453
|
|
|
454 size += ngx_buf_size(cl->buf);
|
|
|
455 }
|
|
|
456
|
|
|
457 if (size == 0) {
|
|
|
458 return NGX_OK;
|
|
|
459 }
|
|
|
460
|
|
0
|
461 ctx->out = ngx_send_chain(ctx->connection, ctx->out, ctx->limit);
|
|
|
462
|
|
|
463 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
|
|
10
|
464 "chain writer out: %p", ctx->out);
|
|
0
|
465
|
|
|
466 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
|
467 return NGX_ERROR;
|
|
|
468 }
|
|
|
469
|
|
|
470 if (ctx->out == NULL) {
|
|
|
471 ctx->last = &ctx->out;
|
|
|
472 return NGX_OK;
|
|
|
473 }
|
|
|
474
|
|
|
475 return NGX_AGAIN;
|
|
|
476 }
|
