diff options
| -rw-r--r-- | internal/nametransform/dirivcache/dirivcache.go | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/internal/nametransform/dirivcache/dirivcache.go b/internal/nametransform/dirivcache/dirivcache.go index 2708d89..c0eca6d 100644 --- a/internal/nametransform/dirivcache/dirivcache.go +++ b/internal/nametransform/dirivcache/dirivcache.go @@ -1,6 +1,8 @@ package dirivcache import ( + "log" + "strings" "sync" "time" ) @@ -38,8 +40,10 @@ type DirIVCache struct { sync.RWMutex } -// Lookup - fetch entry for "dir" from the cache -func (c *DirIVCache) Lookup(dir string) ([]byte, string) { +// Lookup - fetch entry for "dir" (relative plaintext path) from the cache. +// Returns the directory IV and the relative encrypted path, or (nil, "") +// if the entry was not found. +func (c *DirIVCache) Lookup(dir string) (iv []byte, cDir string) { c.RLock() defer c.RUnlock() if dir == "" { @@ -56,13 +60,23 @@ func (c *DirIVCache) Lookup(dir string) ([]byte, string) { return v.iv, v.cDir } -// Store - write entry for "dir" into the cache +// Store - write an entry for directory "dir" into the cache. +// Arguments: +// dir ... relative plaintext path +// iv .... directory IV +// cDir .. relative ciphertext path func (c *DirIVCache) Store(dir string, iv []byte, cDir string) { c.Lock() defer c.Unlock() if dir == "" { c.rootDirIV = iv } + // Sanity check: plaintext and chiphertext paths must have the same number + // of segments + if strings.Count(dir, "/") != strings.Count(cDir, "/") { + log.Panicf("inconsistent number of path segments: dir=%q cDir=%q", dir, cDir) + } + // Clear() may have cleared c.data: re-initialize if c.data == nil { c.data = make(map[string]cacheEntry, maxEntries) // Set expiry time one second into the future |