Mercurial > hg > nginx
annotate src/http/ngx_http_cache.c @ 175:e92c2c647c57
nginx-0.0.1-2003-11-05-20:03:41 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 05 Nov 2003 17:03:41 +0000 |
parents | ea464a6c0581 |
children | c0552e5ab567 |
rev | line source |
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97
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nginx-0.0.1-2003-05-29-17:02:09 import
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2 #include <ngx_config.h> |
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3 #include <ngx_core.h> |
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4 #include <ngx_http.h> |
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5 |
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6 #include <md5.h> |
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7 |
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8 |
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9 int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx) |
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10 { |
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11 ssize_t n; |
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12 MD5_CTX md5; |
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13 ngx_err_t err; |
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14 ngx_http_cache_header_t *h; |
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16 ctx->header_size = sizeof(ngx_http_cache_header_t) + ctx->key.len + 1; |
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17 |
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18 ctx->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32; |
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19 if (!(ctx->file.name.data = ngx_palloc(r->pool, ctx->file.name.len + 1))) { |
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20 return NGX_ERROR; |
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21 } |
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22 |
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23 ngx_memcpy(ctx->file.name.data, ctx->path->name.data, ctx->path->name.len); |
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24 |
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25 MD5Init(&md5); |
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26 MD5Update(&md5, (u_char *) ctx->key.data, ctx->key.len); |
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27 MD5Final(ctx->md5, &md5); |
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28 |
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29 ngx_md5_text(ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len, |
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30 ctx->md5); |
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31 |
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32 ngx_log_debug(r->connection->log, "URL: %s, md5: %s" _ ctx->key.data _ |
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33 ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len); |
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34 |
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35 ngx_create_hashed_filename(&ctx->file, ctx->path); |
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36 |
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37 ngx_log_debug(r->connection->log, "FILE: %s" _ ctx->file.name.data); |
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38 |
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39 /* TODO: look open files cache */ |
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40 |
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41 ctx->file.fd = ngx_open_file(ctx->file.name.data, |
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42 NGX_FILE_RDONLY, NGX_FILE_OPEN); |
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43 |
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44 if (ctx->file.fd == NGX_INVALID_FILE) { |
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45 err = ngx_errno; |
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46 |
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47 if (err == NGX_ENOENT || err == NGX_ENOTDIR) { |
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48 return NGX_DECLINED; |
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49 } |
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50 |
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51 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno, |
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52 ngx_open_file_n " \"%s\" failed", ctx->file.name.data); |
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53 return NGX_ERROR; |
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54 } |
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55 |
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56 n = ngx_read_file(&ctx->file, ctx->buf->pos, |
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57 ctx->buf->end - ctx->buf->last, 0); |
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58 |
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59 if (n == NGX_ERROR || n == NGX_AGAIN) { |
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60 return n; |
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61 } |
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62 |
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63 if (n <= ctx->header_size) { |
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64 ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0, |
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65 "cache file \"%s\" is too small", ctx->file.name.data); |
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66 return NGX_ERROR; |
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67 } |
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68 |
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69 h = (ngx_http_cache_header_t *) ctx->buf->pos; |
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70 ctx->expires = h->expires; |
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71 ctx->last_modified= h->last_modified; |
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72 ctx->date = h->date; |
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73 ctx->length = h->length; |
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74 |
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75 if (h->key_len != ctx->key.len |
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76 || ngx_strncmp(h->key, ctx->key.data, h->key_len) != 0) |
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77 { |
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78 h->key[h->key_len] = '\0'; |
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79 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, |
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80 "md5 collision: \"%s\" and \"%s\"", |
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81 h->key, ctx->key.data); |
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82 return NGX_DECLINED; |
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83 } |
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84 |
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85 ctx->buf->last += n; |
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86 |
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87 if (ctx->expires < ngx_time()) { |
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88 ngx_log_debug(r->connection->log, "EXPIRED"); |
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89 return NGX_HTTP_CACHE_STALE; |
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90 } |
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91 |
172
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92 /* TODO: NGX_HTTP_CACHE_AGED */ |
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93 |
170
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94 return NGX_OK; |
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95 } |
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96 |
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97 |
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98 int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx, |
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99 ngx_str_t *temp_file) |
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100 { |
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101 int retry; |
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102 ngx_err_t err; |
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103 |
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104 retry = 0; |
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105 |
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106 for ( ;; ) { |
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107 if (ngx_rename_file(temp_file->data, ctx->file.name.data) |
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108 != NGX_FILE_ERROR) |
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109 { |
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110 return NGX_OK; |
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111 } |
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112 |
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113 err = ngx_errno; |
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114 |
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115 if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) { |
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116 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno, |
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117 ngx_rename_file_n "(\"%s\", \"%s\") failed", |
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118 temp_file->data, ctx->file.name.data); |
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119 |
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120 return NGX_ERROR; |
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121 } |
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122 |
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123 if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) { |
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124 return NGX_ERROR; |
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125 } |
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126 |
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127 retry = 1; |
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128 } |
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129 } |
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130 |
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131 |
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132 #if 0 |
97
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133 |
99
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134 /* |
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135 * small file in malloc()ed memory, mmap()ed file, file descriptor only, |
105
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136 * file access time only (to estimate could pages still be in memory), |
99
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137 * translated URI (ngx_http_index_hanlder), |
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138 * compiled script (ngx_http_ssi_filter). |
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139 */ |
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140 |
97
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141 |
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142 #define NGX_HTTP_CACHE_ENTRY_DELETED 0x00000001 |
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parents:
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143 #define NGX_HTTP_CACHE_ENTRY_MMAPED 0x00000002 |
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parents:
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144 |
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145 /* "/" -> "/index.html" in ngx_http_index_handler */ |
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146 #define NGX_HTTP_CACHE_ENTRY_URI 0x00000004 |
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147 |
105
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148 /* 301 location "/dir" -> "dir/" in ngx_http_core_handler */ |
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|
149 |
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150 /* compiled script in ngx_http_ssi_filter */ |
99
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151 #define NGX_HTTP_CACHE_ENTRY_SCRIPT 0x00000008 |
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152 |
97
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153 #define NGX_HTTP_CACHE_FILTER_FLAGS 0xFFFF0000 |
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parents:
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154 |
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|
155 |
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156 typedef struct { |
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|
157 ngx_fd_t fd; |
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158 off_t size; |
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|
159 void *data; |
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parents:
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|
160 time_t accessed; |
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parents:
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|
161 time_t last_modified; |
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parents:
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|
162 time_t updated; /* no needed with kqueue */ |
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parents:
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163 int refs; |
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parents:
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|
164 int flags; |
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165 } ngx_http_cache_entry_t; |
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|
166 |
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|
167 |
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|
168 typedef struct { |
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|
169 u_int32_t crc; |
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parents:
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|
170 ngx_str_t uri; |
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parents:
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|
171 ngx_http_cache_t *cache; |
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parents:
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|
172 } ngx_http_cache_hash_entry_t; |
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parents:
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|
173 |
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|
174 |
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parents:
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|
175 typedef struct { |
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parents:
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|
176 ngx_http_cache_t *cache; |
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parents:
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|
177 u_int32_t crc; |
70d2345a903f
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Igor Sysoev <igor@sysoev.ru>
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|
178 int n; |
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parents:
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|
179 } ngx_http_cache_handle_t; |
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|
180 |
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|
181 |
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parents:
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|
182 int ngx_http_cache_get(ngx_http_cache_hash_t *cache_hash, |
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parents:
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|
183 ngx_str_t *uri, ngx_http_cache_handle_t *h) |
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parents:
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|
184 { |
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Igor Sysoev <igor@sysoev.ru>
parents:
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|
185 int hi; |
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parents:
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|
186 ngx_http_cache_hash_entry_t *entry; |
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parents:
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|
187 |
99
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97
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|
188 h->crc = ngx_crc(uri->data, uri->len); |
97
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|
189 |
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|
190 hi = h->crc % cache_hash->size; |
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|
191 entry = cache_hash[hi].elts; |
70d2345a903f
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parents:
diff
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|
192 |
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|
193 for (i = 0; i < cache_hash[hi].nelts; i++) { |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
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|
194 if (entry[i].crc == crc |
70d2345a903f
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parents:
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|
195 && entry[i].uri.len == uri->len |
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|
196 && ngx_strncmp(entry[i].uri.data, uri->data, uri->len) == 0 |
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|
197 { |
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|
198 h->cache = entry[i].cache; |
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|
199 h->cache->refs++; |
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|
200 h->n = hi; |
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parents:
diff
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|
201 return NGX_OK; |
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parents:
diff
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|
202 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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|
203 } |
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Igor Sysoev <igor@sysoev.ru>
parents:
diff
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|
204 |
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|
205 return NGX_ERROR; |
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Igor Sysoev <igor@sysoev.ru>
parents:
diff
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|
206 } |
99
a059e1aa65d4
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parents:
97
diff
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|
207 |
a059e1aa65d4
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parents:
97
diff
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|
208 |
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97
diff
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|
209 /* 32-bit crc16 */ |
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210 |
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211 int ngx_crc(char *data, size_t len) |
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212 { |
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213 u_int32_t sum; |
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214 |
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215 for (sum = 0; len; len--) { |
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216 /* |
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217 * gcc 2.95.2 x86 and icc 7.1.006 compile that operator |
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218 * into the single rol opcode. |
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219 * msvc 6.0sp2 compiles it into four opcodes. |
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220 */ |
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221 sum = sum >> 1 | sum << 31; |
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222 |
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223 sum += *data++; |
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224 } |
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225 |
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226 return sum; |
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227 } |
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228 |
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229 #endif |