Add page 'ls_cache'

This new page will list all entries found in the current cache, which is
useful when reviewing the new cache implementation. There are no links to
the new page, but it's reachable by adding 'p=ls_cache' to any cgit url.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/cache.c b/cache.c
index e590d7b..b701e13 100644
--- a/cache.c
+++ b/cache.c
@@ -239,105 +239,173 @@ static int process_slot(struct cache_slot *slot)
                 }
                 print_slot(slot);
                 close_slot(slot);
                 return 0;
         }
 
         /* If the cache slot does not exist (or its key doesn't match the
          * current key), lets try to create a new cache slot for this
          * request. If this fails (for whatever reason), lets just generate
          * the content without caching it and fool the caller to belive
          * everything worked out (but print a warning on stdout).
          */
 
         close_slot(slot);
         if ((err = lock_slot(slot)) != 0) {
                 cache_log("[cgit] Unable to lock slot %s: %s (%d)\n",
                           slot->lock_name, strerror(err), err);
                 slot->fn(slot->cbdata);
                 return 0;
         }
 
         if ((err = fill_slot(slot)) != 0) {
                 cache_log("[cgit] Unable to fill slot %s: %s (%d)\n",
                           slot->lock_name, strerror(err), err);
                 unlock_slot(slot, 0);
                 close_lock(slot);
                 slot->fn(slot->cbdata);
                 return 0;
         }
         // We've got a valid cache slot in the lock file, which
         // is about to replace the old cache slot. But if we
         // release the lockfile and then try to open the new cache
         // slot, we might get a race condition with a concurrent
         // writer for the same cache slot (with a different key).
         // Lets avoid such a race by just printing the content of
         // the lock file.
         slot->cache_fd = slot->lock_fd;
         unlock_slot(slot, 1);
         err = print_slot(slot);
         close_slot(slot);
         return err;
 }
 
 /* Print cached content to stdout, generate the content if necessary. */
 int cache_process(int size, const char *path, const char *key, int ttl,
                   cache_fill_fn fn, void *cbdata)
 {
         unsigned long hash;
         int len, i;
         char filename[1024];
         char lockname[1024 + 5];  /* 5 = ".lock" */
         struct cache_slot slot;
 
         /* If the cache is disabled, just generate the content */
         if (size <= 0) {
                 fn(cbdata);
                 return 0;
         }
 
         /* Verify input, calculate filenames */
         if (!path) {
                 cache_log("[cgit] Cache path not specified, caching is disabled\n");
                 fn(cbdata);
                 return 0;
         }
         len = strlen(path);
         if (len > sizeof(filename) - 10) { /* 10 = "/01234567\0" */
                 cache_log("[cgit] Cache path too long, caching is disabled: %s\n",
                           path);
                 fn(cbdata);
                 return 0;
         }
         if (!key)
                 key = "";
         hash = hash_str(key) % size;
         strcpy(filename, path);
         if (filename[len - 1] != '/')
                 filename[len++] = '/';
         for(i = 0; i < 8; i++) {
                 sprintf(filename + len++, "%x",
                         (unsigned char)(hash & 0xf));
                 hash >>= 4;
         }
         filename[len] = '\0';
         strcpy(lockname, filename);
         strcpy(lockname + len, ".lock");
         slot.fn = fn;
         slot.cbdata = cbdata;
         slot.ttl = ttl;
         slot.cache_name = filename;
         slot.lock_name = lockname;
         slot.key = key;
         slot.keylen = strlen(key);
         return process_slot(&slot);
 }
 
+/* Return a strftime formatted date/time
+ * NB: the result from this function is to shared memory
+ */
+char *sprintftime(const char *format, time_t time)
+{
+        static char buf[64];
+        struct tm *tm;
+
+        if (!time)
+                return NULL;
+        tm = gmtime(&time);
+        strftime(buf, sizeof(buf)-1, format, tm);
+        return buf;
+}
+
+int cache_ls(const char *path)
+{
+        DIR *dir;
+        struct dirent *ent;
+        int err = 0;
+        struct cache_slot slot;
+        char fullname[1024];
+        char *name;
+
+        if (!path) {
+                cache_log("[cgit] cache path not specified\n");
+                return -1;
+        }
+        if (strlen(path) > 1024 - 10) {
+                cache_log("[cgit] cache path too long: %s\n",
+                          path);
+                return -1;
+        }
+        dir = opendir(path);
+        if (!dir) {
+                err = errno;
+                cache_log("[cgit] unable to open path %s: %s (%d)\n",
+                          path, strerror(err), err);
+                return err;
+        }
+        strcpy(fullname, path);
+        name = fullname + strlen(path);
+        if (*(name - 1) != '/') {
+                *name++ = '/';
+                *name = '\0';
+        }
+        slot.cache_name = fullname;
+        while((ent = readdir(dir)) != NULL) {
+                if (strlen(ent->d_name) != 8)
+                        continue;
+                strcpy(name, ent->d_name);
+                if ((err = open_slot(&slot)) != 0) {
+                        cache_log("[cgit] unable to open path %s: %s (%d)\n",
+                                  fullname, strerror(err), err);
+                        continue;
+                }
+                printf("%s %s %10lld %s\n",
+                       name,
+                       sprintftime("%Y-%m-%d %H:%M:%S",
+                                   slot.cache_st.st_mtime),
+                       slot.cache_st.st_size,
+                       slot.buf);
+                close_slot(&slot);
+        }
+        closedir(dir);
+        return 0;
+}
+
 /* Print a message to stdout */
 void cache_log(const char *format, ...)
 {
         va_list args;
         va_start(args, format);
         vfprintf(stderr, format, args);
         va_end(args);
 }