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-rw-r--r--cache.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/cache.c b/cache.c
new file mode 100644
index 0000000..1be1ea4
--- /dev/null
+++ b/cache.c
@@ -0,0 +1,86 @@
1#include "cgit.h"
2
3const int NOLOCK = -1;
4
5int 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
32int 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
52int 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
75int cache_unlock(struct cacheitem *item)
76{
77 close(item->fd);
78 return (rename(fmt("%s.lock", item->name), item->name) == 0);
79}
80
81int 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}