Mercurial > hg > nginx-quic
annotate src/http/ngx_http_cache.c @ 130:a490ad05164d
nginx-0.0.1-2003-08-11-20:03:06 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Mon, 11 Aug 2003 16:03:06 +0000 |
parents | b5be4b0448d3 |
children | c42be4185301 |
rev | line source |
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1 |
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3 /* |
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4 * small file in malloc()ed memory, mmap()ed file, file descriptor only, |
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5 * file access time only (to estimate could pages still be in memory), |
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6 * translated URI (ngx_http_index_hanlder), |
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7 * compiled script (ngx_http_ssi_filter). |
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8 */ |
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9 |
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10 |
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11 #define NGX_HTTP_CACHE_ENTRY_DELETED 0x00000001 |
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12 #define NGX_HTTP_CACHE_ENTRY_MMAPED 0x00000002 |
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13 |
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14 /* "/" -> "/index.html" in ngx_http_index_handler */ |
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15 #define NGX_HTTP_CACHE_ENTRY_URI 0x00000004 |
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16 |
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17 /* 301 location "/dir" -> "dir/" in ngx_http_core_handler */ |
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18 |
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19 /* compiled script in ngx_http_ssi_filter */ |
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20 #define NGX_HTTP_CACHE_ENTRY_SCRIPT 0x00000008 |
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21 |
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22 #define NGX_HTTP_CACHE_FILTER_FLAGS 0xFFFF0000 |
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23 |
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24 |
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25 typedef struct { |
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26 ngx_fd_t fd; |
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27 off_t size; |
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28 void *data; |
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29 time_t accessed; |
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30 time_t last_modified; |
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31 time_t updated; /* no needed with kqueue */ |
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32 int refs; |
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33 int flags; |
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34 } ngx_http_cache_entry_t; |
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35 |
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36 |
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37 typedef struct { |
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38 u_int32_t crc; |
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39 ngx_str_t uri; |
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40 ngx_http_cache_t *cache; |
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41 } ngx_http_cache_hash_entry_t; |
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42 |
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43 |
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44 typedef struct { |
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45 ngx_http_cache_t *cache; |
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46 u_int32_t crc; |
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47 int n; |
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48 } ngx_http_cache_handle_t; |
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49 |
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50 |
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51 int ngx_http_cache_get(ngx_http_cache_hash_t *cache_hash, |
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52 ngx_str_t *uri, ngx_http_cache_handle_t *h) |
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53 { |
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54 int hi; |
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55 ngx_http_cache_hash_entry_t *entry; |
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56 |
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57 h->crc = ngx_crc(uri->data, uri->len); |
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58 |
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59 hi = h->crc % cache_hash->size; |
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60 entry = cache_hash[hi].elts; |
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61 |
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62 for (i = 0; i < cache_hash[hi].nelts; i++) { |
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63 if (entry[i].crc == crc |
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64 && entry[i].uri.len == uri->len |
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65 && ngx_strncmp(entry[i].uri.data, uri->data, uri->len) == 0 |
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66 { |
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67 h->cache = entry[i].cache; |
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68 h->cache->refs++; |
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69 h->n = hi; |
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70 return NGX_OK; |
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71 } |
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72 } |
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73 |
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74 return NGX_ERROR; |
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75 } |
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76 |
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77 |
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78 /* 32-bit crc16 */ |
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79 |
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80 int ngx_crc(char *data, size_t len) |
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81 { |
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82 u_int32_t sum; |
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83 |
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84 for (sum = 0; len; len--) { |
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85 /* |
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86 * gcc 2.95.2 x86 and icc 7.1.006 compile that operator |
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87 * into the single rol opcode. |
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88 * msvc 6.0sp2 compiles it into four opcodes. |
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89 */ |
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90 sum = sum >> 1 | sum << 31; |
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91 |
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92 sum += *data++; |
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93 } |
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94 |
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95 return sum; |
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96 } |