gitweb.ps.run Git - ps-cgit/blob - cache.c

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