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diff --git a/cache.c b/cache.c new file mode 100644 index 0000000..1be1ea4 --- a/dev/null +++ b/ cache.c |
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@@ -0,0 +1,86 @@ |
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1 | #include "cgit.h" |
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2 | |
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3 | const int NOLOCK = -1; |
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4 | |
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5 | int cache_lookup(struct cacheitem *item) |
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6 | { |
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7 | if (!cgit_query_repo) { |
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8 | item->name = xstrdup(fmt("%s/index.html", cgit_cache_root)); |
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9 | item->ttl = cgit_cache_root_ttl; |
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10 | } else if (!cgit_query_page) { |
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11 | item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root, |
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12 | cgit_query_repo)); |
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13 | item->ttl = cgit_cache_repo_ttl; |
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14 | } else { |
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15 | item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root, |
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16 | cgit_query_repo, cgit_query_page, |
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17 | cgit_querystring)); |
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18 | if (cgit_query_has_symref) |
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19 | item->ttl = cgit_cache_dynamic_ttl; |
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20 | else if (cgit_query_has_sha1) |
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21 | item->ttl = cgit_cache_static_ttl; |
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22 | else |
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23 | item->ttl = cgit_cache_repo_ttl; |
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24 | } |
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25 | if (stat(item->name, &item->st)) { |
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26 | item->st.st_mtime = 0; |
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27 | return 0; |
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28 | } |
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29 | return 1; |
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30 | } |
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31 | |
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32 | int cache_create_dirs() |
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33 | { |
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34 | char *path; |
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35 | |
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36 | if (!cgit_query_repo) |
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37 | return 0; |
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38 | |
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39 | path = fmt("%s/%s", cgit_cache_root, cgit_query_repo); |
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40 | if (mkdir(path, S_IRWXU) && errno!=EEXIST) |
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41 | return 0; |
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42 | |
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43 | if (cgit_query_page) { |
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44 | path = fmt("%s/%s/%s", cgit_cache_root, cgit_query_repo, |
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45 | cgit_query_page); |
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46 | if (mkdir(path, S_IRWXU) && errno!=EEXIST) |
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47 | return 0; |
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48 | } |
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49 | return 1; |
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50 | } |
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51 | |
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52 | int cache_lock(struct cacheitem *item) |
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53 | { |
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54 | int ret; |
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55 | char *lockfile = fmt("%s.lock", item->name); |
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56 | |
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57 | top: |
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58 | item->fd = open(lockfile, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR|S_IWUSR); |
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59 | if (item->fd == NOLOCK && errno == ENOENT && cache_create_dirs()) |
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60 | goto top; |
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61 | if (item->fd == NOLOCK && errno == EEXIST) { |
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62 | struct stat st; |
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63 | time_t t; |
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64 | if (stat(lockfile, &st)) |
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65 | return ret; |
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66 | t = time(NULL); |
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67 | if (t-st.st_mtime > cgit_cache_max_create_time && |
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68 | !unlink(lockfile)) |
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69 | goto top; |
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70 | return 0; |
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71 | } |
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72 | return (item->fd > 0); |
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73 | } |
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74 | |
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75 | int cache_unlock(struct cacheitem *item) |
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76 | { |
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77 | close(item->fd); |
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78 | return (rename(fmt("%s.lock", item->name), item->name) == 0); |
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79 | } |
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80 | |
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81 | int cache_expired(struct cacheitem *item) |
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82 | { |
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83 | if (item->ttl < 0) |
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84 | return 0; |
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85 | return item->st.st_mtime + item->ttl * 60 < time(NULL); |
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86 | } |
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