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Merge pull request #582 from ethcore/secret-store-sync-ready

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making key directory thread-safe
This commit is contained in:
Marek Kotewicz 2016-03-04 13:22:32 +01:00
commit 9c1f3d5fff
1 changed files with 16 additions and 16 deletions
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32
util/src/keys/directory.rs
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@ -461,17 +461,17 @@ enum KeyFileLoadError {
pub struct KeyDirectory {
/// Directory path for key management.
path: String,
cache: RefCell<HashMap<Uuid, KeyFileContent>>,
cache_usage: RefCell<VecDeque<Uuid>>,
cache: RwLock<HashMap<Uuid, KeyFileContent>>,
cache_usage: RwLock<VecDeque<Uuid>>,
}
impl KeyDirectory {
/// Initializes new cache directory context with a given `path`
pub fn new(path: &Path) -> KeyDirectory {
KeyDirectory {
cache: RefCell::new(HashMap::new()),
cache: RwLock::new(HashMap::new()),
path: path.to_str().expect("Initialized key directory with empty path").to_owned(),
cache_usage: RefCell::new(VecDeque::new()),
cache_usage: RwLock::new(VecDeque::new()),
}
}
@ -484,7 +484,7 @@ impl KeyDirectory {
let json_bytes = json_text.into_bytes();
try!(file.write(&json_bytes));
}
let mut cache = self.cache.borrow_mut();
let mut cache = self.cache.write().unwrap();
let id = key_file.id.clone();
cache.insert(id.clone(), key_file);
Ok(id.clone())
@ -495,14 +495,14 @@ impl KeyDirectory {
pub fn get(&self, id: &Uuid) -> Option<KeyFileContent> {
let path = self.key_path(id);
{
let mut usage = self.cache_usage.borrow_mut();
let mut usage = self.cache_usage.write().unwrap();
usage.push_back(id.clone());
}
if !self.cache.borrow().contains_key(id) {
if !self.cache.read().unwrap().contains_key(id) {
match KeyDirectory::load_key(&path) {
Ok(loaded_key) => {
self.cache.borrow_mut().insert(id.to_owned(), loaded_key);
self.cache.write().unwrap().insert(id.to_owned(), loaded_key);
}
Err(error) => {
warn!(target: "sstore", "error loading key {:?}: {:?}", id, error);
@ -512,7 +512,7 @@ impl KeyDirectory {
}
// todo: replace with Ref::map when it stabilized to avoid copies
Some(self.cache.borrow().get(id)
Some(self.cache.read().unwrap().get(id)
.expect("Key should be there, we have just inserted or checked it.")
.clone())
}
@ -524,7 +524,7 @@ impl KeyDirectory {
/// Removes keys that never been requested during last `MAX_USAGE_TRACK` times
pub fn collect_garbage(&mut self) {
let mut cache_usage = self.cache_usage.borrow_mut();
let mut cache_usage = self.cache_usage.write().unwrap();
let total_usages = cache_usage.len();
let untracked_usages = max(total_usages as i64 - MAX_CACHE_USAGE_TRACK as i64, 0) as usize;
@ -532,31 +532,31 @@ impl KeyDirectory {
cache_usage.drain(..untracked_usages);
}
if self.cache.borrow().len() <= MAX_CACHE_USAGE_TRACK { return; }
if self.cache.read().unwrap().len() <= MAX_CACHE_USAGE_TRACK { return; }
let uniqs: HashSet<&Uuid> = cache_usage.iter().collect();
let removes:Vec<Uuid> = {
let cache = self.cache.borrow();
let cache = self.cache.read().unwrap();
cache.keys().cloned().filter(|key| !uniqs.contains(key)).collect()
};
if removes.is_empty() { return; }
let mut cache = self.cache.borrow_mut();
let mut cache = self.cache.write().unwrap();
for key in removes { cache.remove(&key); }
}
/// Reports how many keys are currently cached.
pub fn cache_size(&self) -> usize {
self.cache.borrow().len()
self.cache.read().unwrap().len()
}
/// Removes key file from key directory
pub fn delete(&mut self, id: &Uuid) -> Result<(), ::std::io::Error> {
let path = self.key_path(id);
if !self.cache.borrow().contains_key(id) {
if !self.cache.read().unwrap().contains_key(id) {
return match fs::remove_file(&path) {
Ok(_) => {
self.cache.borrow_mut().remove(&id);
self.cache.write().unwrap().remove(&id);
Ok(())
},
Err(e) => Err(e)