cgit/cache.c, branch v0.4

Remove troublesome chars from cachefile names

2007-01-11T23:24:35Z

Add a funtion cache_safe_filename() which replaces possibly bad filename characters with '_'. Signed-off-by: Lars Hjemli

Move cache_prepare() to cgit

2007-01-11T23:00:15Z

This moves some cgit-specific stuff away from cache.c Signed-off-by: Lars Hjemli

Allow relative paths for cgit_cache_root

2006-12-16T12:55:58Z

Make sure we chdir(2) back to the original getcwd(2) when a page has been generated. Also, if the cgit_cache_root do not exist, try to create it. This is a feature intended to ease testing/debugging. Signed-off-by: Lars Hjemli

cache_lock: do xstrdup/free on lockfile

2006-12-12T09:16:41Z

Since fmt() uses 8 alternating static buffers, and cache_lock might call cache_create_dirs() multiple times, which in turn might call fmt() twice, after four iterations lockfile would be overwritten by a cachedirectory path. In worst case, this could cause the cachedirectory to be unlinked and replaced by a cachefile. Fix: use xstrdup() on the result from fmt() before assigning to lockfile, and call free(lockfile) before exit. Signed-off-by: Lars Hjemli

Don't truncate valid cachefiles

2006-12-11T21:53:50Z

An embarrassing thinko in cgit_check_cache() would truncate valid cachefiles in the following situation: 1) process A notices a missing/expired cachefile 2) process B gets scheduled, locks, fills and unlocks the cachefile 3) process A gets scheduled, locks the cachefile, notices that the cachefile now exist/is not expired anymore, and continues to overwrite it with an empty lockfile. Thanks to Linus for noticing (again). Signed-off-by: Lars Hjemli

Avoid infinite loops in caching layer

2006-12-11T11:10:12Z

Add a global variable, cgit_max_lock_attemps, to avoid the possibility of infinite loops when failing to acquire a lockfile. This could happen on broken setups or under crazy server load. Incidentally, this also fixes a lurking bug in cache_lock() where an uninitialized returnvalue was used. Signed-off-by: Lars Hjemli

Fix cache algorithm loophole

2006-12-11T08:57:58Z

This closes the door for unneccessary calls to cgit_fill_cache(). Noticed by Linus. Signed-off-by: Lars Hjemli

Add license file and copyright notices

2006-12-10T21:41:14Z

Signed-off-by: Lars Hjemli

Add caching infrastructure

2006-12-10T21:31:36Z

This enables internal caching of page output. Page requests are split into four groups: 1) repo listing (front page) 2) repo summary 3) repo pages w/symbolic references in query string 4) repo pages w/constant sha1's in query string Each group has a TTL specified in minutes. When a page is requested, a cached filename is stat(2)'ed and st_mtime is compared to time(2). If TTL has expired (or the file didn't exist), the cached file is regenerated. When generating a cached file, locking is used to avoid parallell processing of the request. If multiple processes tries to aquire the same lock, the ones who fail to get the lock serves the (expired) cached file. If the cached file don't exist, the process instead calls sched_yield(2) before restarting the request processing. Signed-off-by: Lars Hjemli