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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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48
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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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48
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25 ngx_uint_t sendfile);
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0
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26
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27
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48
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28 ngx_int_t
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29 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
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0
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30 {
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31 int rc, last;
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22
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32 off_t bsize;
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33 size_t size;
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0
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34 ngx_chain_t *cl, *out, **last_out;
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35
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4
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36 if (ctx->in == NULL && ctx->busy == NULL) {
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0
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37
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18
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38 /*
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39 * the short path for the case when the ctx->in and ctx->busy chains
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40 * are empty, the incoming chain is empty too or has the single buf
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41 * that does not require the copy
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42 */
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0
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43
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44 if (in == NULL) {
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45 return ctx->output_filter(ctx->filter_ctx, in);
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46 }
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47
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48 if (in->next == NULL
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18
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49 #if (NGX_SENDFILE_LIMIT)
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50 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
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51 #endif
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0
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52 && (!ngx_output_chain_need_to_copy(ctx, in->buf)))
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53 {
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54 return ctx->output_filter(ctx->filter_ctx, in);
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55 }
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56 }
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57
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58 /* add the incoming buf to the chain ctx->in */
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59
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60 if (in) {
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18
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61 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
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0
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62 return NGX_ERROR;
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63 }
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64 }
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65
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66 out = NULL;
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67 last_out = &out;
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48
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68 last = NGX_NONE;
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0
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69
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70 for ( ;; ) {
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71
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72 while (ctx->in) {
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73
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74 /*
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75 * cycle while there are the ctx->in bufs
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76 * or there are the free output bufs to copy in
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77 */
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78
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79 bsize = ngx_buf_size(ctx->in->buf);
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80
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81 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
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82
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83 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
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32
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84 "zero size buf in output "
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85 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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86 ctx->in->buf->temporary,
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87 ctx->in->buf->recycled,
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88 ctx->in->buf->in_file,
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89 ctx->in->buf->start,
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90 ctx->in->buf->pos,
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91 ctx->in->buf->last,
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92 ctx->in->buf->file,
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93 ctx->in->buf->file_pos,
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94 ctx->in->buf->file_last);
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0
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95
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22
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96 ngx_debug_point();
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97
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0
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98 ctx->in = ctx->in->next;
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99
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100 continue;
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101 }
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102
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103 if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) {
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104
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105 /* move the chain link to the output chain */
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106
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107 cl = ctx->in;
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108 ctx->in = cl->next;
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109
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110 *last_out = cl;
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111 last_out = &cl->next;
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112 cl->next = NULL;
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113
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114 continue;
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115 }
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116
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117 if (ctx->buf == NULL) {
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118
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119 /* get the free buf */
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120
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121 if (ctx->free) {
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122 ctx->buf = ctx->free->buf;
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123 ctx->free = ctx->free->next;
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124
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125 } else if (out || ctx->allocated == ctx->bufs.num) {
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126
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127 break;
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128
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129 } else {
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130
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131 size = ctx->bufs.size;
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132
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133 if (ctx->in->buf->last_buf) {
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134
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22
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135 if (bsize < (off_t) ctx->bufs.size) {
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0
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136
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137 /*
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138 * allocate small temp buf for the small last buf
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139 * or its small last part
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140 */
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141
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22
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142 size = (size_t) bsize;
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0
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143
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144 } else if (ctx->bufs.num == 1
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22
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145 && (bsize < (off_t) (ctx->bufs.size
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146 + (ctx->bufs.size >> 2))))
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0
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147 {
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148 /*
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149 * allocate a temp buf that equals
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150 * to the last buf if the last buf size is lesser
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151 * than 1.25 of bufs.size and a temp buf is single
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152 */
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153
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22
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154 size = (size_t) bsize;
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0
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155 }
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156 }
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157
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50
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158 ctx->buf = ngx_create_temp_buf(ctx->pool, size);
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159 if (ctx->buf == NULL) {
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0
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160 return NGX_ERROR;
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161 }
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162
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163 ctx->buf->tag = ctx->tag;
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164 ctx->buf->recycled = 1;
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165 ctx->allocated++;
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166 }
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167 }
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168
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169 rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf,
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170 ctx->sendfile);
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171
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172 if (rc == NGX_ERROR) {
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173 return rc;
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174 }
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175
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176 if (rc == NGX_AGAIN) {
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177 if (out) {
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178 break;
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179 }
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180
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181 return rc;
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182 }
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183
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184 /* delete the completed buf from the ctx->in chain */
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185
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186 if (ngx_buf_size(ctx->in->buf) == 0) {
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187 ctx->in = ctx->in->next;
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188 }
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189
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50
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190 cl = ngx_alloc_chain_link(ctx->pool);
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191 if (cl == NULL) {
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10
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192 return NGX_ERROR;
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193 }
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50
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194
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10
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195 cl->buf = ctx->buf;
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196 cl->next = NULL;
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0
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197 *last_out = cl;
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198 last_out = &cl->next;
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199 ctx->buf = NULL;
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200 }
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201
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202 if (out == NULL && last != NGX_NONE) {
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203 return last;
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204 }
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205
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206 last = ctx->output_filter(ctx->filter_ctx, out);
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207
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208 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
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209 last_out = &out;
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210
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211 if (last == NGX_ERROR) {
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212 return last;
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213 }
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214 }
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215 }
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216
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217
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16
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218 static ngx_inline ngx_int_t
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48
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219 ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
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0
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220 {
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18
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221 ngx_uint_t sendfile;
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222
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0
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223 if (ngx_buf_special(buf)) {
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224 return 0;
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225 }
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226
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18
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227 sendfile = ctx->sendfile;
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228
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229 #if (NGX_SENDFILE_LIMIT)
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230
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231 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
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232 sendfile = 0;
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233 }
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234
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235 #endif
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236
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237 if (!sendfile) {
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4
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238
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0
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239 if (!ngx_buf_in_memory(buf)) {
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240 return 1;
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241 }
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242
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243 buf->in_file = 0;
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244 }
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245
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246 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
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247 return 1;
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248 }
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249
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250 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
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251 return 1;
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252 }
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253
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254 return 0;
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255 }
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256
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257
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48
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258 static ngx_int_t
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259 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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260 ngx_chain_t *in)
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18
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261 {
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262 ngx_chain_t *cl, **ll;
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263 #if (NGX_SENDFILE_LIMIT)
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264 ngx_buf_t *b, *buf;
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265 #endif
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266
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267 ll = chain;
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268
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269 for (cl = *chain; cl; cl = cl->next) {
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270 ll = &cl->next;
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271 }
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272
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273 while (in) {
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274
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50
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275 cl = ngx_alloc_chain_link(pool);
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276 if (cl == NULL) {
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18
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277 return NGX_ERROR;
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278 }
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279
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280 #if (NGX_SENDFILE_LIMIT)
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281
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282 buf = in->buf;
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283
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284 if (buf->in_file
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285 && buf->file_pos < NGX_SENDFILE_LIMIT
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286 && buf->file_last > NGX_SENDFILE_LIMIT)
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287 {
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50
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288 b = ngx_calloc_buf(pool);
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289 if (b == NULL) {
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18
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290 return NGX_ERROR;
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291 }
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292
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293 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
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294
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295 if (ngx_buf_in_memory(buf)) {
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296 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
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297 b->last = buf->pos;
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298 }
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299
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300 buf->file_pos = NGX_SENDFILE_LIMIT;
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301 b->file_last = NGX_SENDFILE_LIMIT;
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302
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303 cl->buf = b;
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304
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305 } else {
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306 cl->buf = buf;
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307 in = in->next;
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308 }
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309
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310 #else
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311 cl->buf = in->buf;
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312 in = in->next;
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313
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314 #endif
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315
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316 *ll = cl;
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317 ll = &cl->next;
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318 }
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319
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320 *ll = NULL;
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321
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322 return NGX_OK;
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323 }
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324
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325
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48
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326 static ngx_int_t
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327 ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, ngx_uint_t sendfile)
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0
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328 {
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22
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329 off_t size;
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0
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330 ssize_t n;
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331
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332 size = ngx_buf_size(src);
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333
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22
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334 if (size > dst->end - dst->pos) {
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0
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335 size = dst->end - dst->pos;
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336 }
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337
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18
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338 #if (NGX_SENDFILE_LIMIT)
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339
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340 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
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341 sendfile = 0;
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342 }
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343
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344 #endif
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345
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0
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346 if (ngx_buf_in_memory(src)) {
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22
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347 ngx_memcpy(dst->pos, src->pos, (size_t) size);
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348 src->pos += (size_t) size;
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349 dst->last += (size_t) size;
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0
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350
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4
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351 if (src->in_file) {
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352
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353 if (sendfile) {
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354 dst->in_file = 1;
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355 dst->file = src->file;
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356 dst->file_pos = src->file_pos;
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357 dst->file_last = src->file_pos + size;
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358
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359 } else {
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360 dst->in_file = 0;
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361 }
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362
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0
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363 src->file_pos += size;
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2
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364
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365 } else {
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366 dst->in_file = 0;
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0
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367 }
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368
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369 if (src->last_buf && src->pos == src->last) {
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370 dst->last_buf = 1;
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371 }
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372
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373 } else {
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22
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374 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
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0
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375
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376 if (n == NGX_ERROR) {
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377 return n;
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378 }
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379
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380 #if (NGX_FILE_AIO_READ)
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381 if (n == NGX_AGAIN) {
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382 return n;
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383 }
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384 #endif
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385
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22
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386 if (n != size) {
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0
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387 ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
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22
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388 ngx_read_file_n " reads only %z of %O from file",
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0
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389 n, size);
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390 if (n == 0) {
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391 return NGX_ERROR;
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392 }
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393 }
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394
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395 dst->last += n;
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396
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2
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397 if (sendfile) {
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398 dst->in_file = 1;
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399 dst->file = src->file;
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400 dst->file_pos = src->file_pos;
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4
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401 dst->file_last = src->file_pos + n;
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2
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402
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403 } else {
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0
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404 dst->in_file = 0;
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405 }
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406
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4
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407 src->file_pos += n;
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408
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0
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409 if (src->last_buf && src->file_pos == src->file_last) {
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410 dst->last_buf = 1;
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411 }
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412 }
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413
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414 return NGX_OK;
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415 }
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416
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417
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48
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418 ngx_int_t
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|
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419 ngx_chain_writer(void *data, ngx_chain_t *in)
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0
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420 {
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421 ngx_chain_writer_ctx_t *ctx = data;
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422
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22
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423 off_t size;
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0
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424 ngx_chain_t *cl;
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425
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22
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426 for (size = 0; in; in = in->next) {
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427
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428 #if 1
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429 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
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430 ngx_debug_point();
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431 }
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432 #endif
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433
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434 size += ngx_buf_size(in->buf);
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0
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435
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|
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436 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
|
|
10
|
437 "chain writer buf size: %uz", ngx_buf_size(in->buf));
|
|
0
|
438
|
|
50
|
439 cl = ngx_alloc_chain_link(ctx->pool);
|
|
|
440 if (cl == NULL) {
|
|
10
|
441 return NGX_ERROR;
|
|
|
442 }
|
|
50
|
443
|
|
10
|
444 cl->buf = in->buf;
|
|
|
445 cl->next = NULL;
|
|
0
|
446 *ctx->last = cl;
|
|
|
447 ctx->last = &cl->next;
|
|
|
448 }
|
|
|
449
|
|
|
450 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
|
|
10
|
451 "chain writer in: %p", ctx->out);
|
|
0
|
452
|
|
22
|
453 for (cl = ctx->out; cl; cl = cl->next) {
|
|
|
454
|
|
|
455 #if 1
|
|
|
456 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
|
457 ngx_debug_point();
|
|
|
458 }
|
|
|
459
|
|
|
460 #endif
|
|
|
461
|
|
|
462 size += ngx_buf_size(cl->buf);
|
|
|
463 }
|
|
|
464
|
|
|
465 if (size == 0) {
|
|
|
466 return NGX_OK;
|
|
|
467 }
|
|
|
468
|
|
0
|
469 ctx->out = ngx_send_chain(ctx->connection, ctx->out, ctx->limit);
|
|
|
470
|
|
|
471 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0,
|
|
10
|
472 "chain writer out: %p", ctx->out);
|
|
0
|
473
|
|
|
474 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
|
475 return NGX_ERROR;
|
|
|
476 }
|
|
|
477
|
|
|
478 if (ctx->out == NULL) {
|
|
|
479 ctx->last = &ctx->out;
|
|
|
480 return NGX_OK;
|
|
|
481 }
|
|
|
482
|
|
|
483 return NGX_AGAIN;
|
|
|
484 }
|
