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open-vault
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Make useCache explicit everywhere in lock manager (#6035) 

* Make useCache explicit everywhere in lock manager

This also clears up a case where we could insert into the cache when it
wasn't active

* Address feedback
This commit is contained in:
Jeff Mitchell 2019-01-14 11:58:03 -05:00 committed by Brian Kassouf
parent c07c946b7b
commit 4dfb25927a
1 changed files with 39 additions and 12 deletions
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51
helper/keysutil/lock_manager.go
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@ -74,7 +74,9 @@ func (lm *LockManager) CacheActive() bool {
}
func (lm *LockManager) InvalidatePolicy(name string) {
lm.cache.Delete(name)
if lm.useCache {
lm.cache.Delete(name)
}
}
// RestorePolicy acquires an exclusive lock on the policy name and restores the
@ -103,12 +105,17 @@ func (lm *LockManager) RestorePolicy(ctx context.Context, storage logical.Storag
lock.Lock()
defer lock.Unlock()
var ok bool
var pRaw interface{}
// If the policy is in cache and 'force' is not specified, error out. Anywhere
// that would put it in the cache will also be protected by the mutex above,
// so we don't need to re-check the cache later.
pRaw, ok := lm.cache.Load(name)
if ok && !force {
return fmt.Errorf("key %q already exists", name)
if lm.useCache {
pRaw, ok = lm.cache.Load(name)
if ok && !force {
return fmt.Errorf("key %q already exists", name)
}
}
// Conditionally look up the policy from storage, depending on the use of
@ -168,7 +175,9 @@ func (lm *LockManager) RestorePolicy(ctx context.Context, storage logical.Storag
keyData.Policy.l = new(sync.RWMutex)
// Update the cache to contain the restored policy
lm.cache.Store(name, keyData.Policy)
if lm.useCache {
lm.cache.Store(name, keyData.Policy)
}
return nil
}
@ -183,7 +192,12 @@ func (lm *LockManager) BackupPolicy(ctx context.Context, storage logical.Storage
lock.Lock()
defer lock.Unlock()
pRaw, ok := lm.cache.Load(name)
var ok bool
var pRaw interface{}
if lm.useCache {
pRaw, ok = lm.cache.Load(name)
}
if ok {
p = pRaw.(*Policy)
p.l.Lock()
@ -216,9 +230,13 @@ func (lm *LockManager) BackupPolicy(ctx context.Context, storage logical.Storage
func (lm *LockManager) GetPolicy(ctx context.Context, req PolicyRequest) (retP *Policy, retUpserted bool, retErr error) {
var p *Policy
var err error
var ok bool
var pRaw interface{}
// Check if it's in our cache. If so, return right away.
pRaw, ok := lm.cache.Load(req.Name)
if lm.useCache {
pRaw, ok = lm.cache.Load(req.Name)
}
if ok {
p = pRaw.(*Policy)
if atomic.LoadUint32(&p.deleted) == 1 {
@ -241,15 +259,18 @@ func (lm *LockManager) GetPolicy(ctx context.Context, req PolicyRequest) (retP *
// themselves
case lm.useCache:
lock.Unlock()
// If not using the cache, if we aren't returning a policy the caller
// doesn't have a lock, so we must unlock
// If not using the cache, if we aren't returning a policy the caller
// doesn't have a lock, so we must unlock
case retP == nil:
lock.Unlock()
}
}
// Check the cache again
pRaw, ok = lm.cache.Load(req.Name)
if lm.useCache {
pRaw, ok = lm.cache.Load(req.Name)
}
if ok {
p = pRaw.(*Policy)
if atomic.LoadUint32(&p.deleted) == 1 {
@ -378,6 +399,8 @@ func (lm *LockManager) GetPolicy(ctx context.Context, req PolicyRequest) (retP *
func (lm *LockManager) DeletePolicy(ctx context.Context, storage logical.Storage, name string) error {
var p *Policy
var err error
var ok bool
var pRaw interface{}
// We may be writing to disk, so grab an exclusive lock. This prevents bad
// behavior when the cache is turned off. We also lock the shared policy
@ -386,7 +409,9 @@ func (lm *LockManager) DeletePolicy(ctx context.Context, storage logical.Storage
lock.Lock()
defer lock.Unlock()
pRaw, ok := lm.cache.Load(name)
if lm.useCache {
pRaw, ok = lm.cache.Load(name)
}
if ok {
p = pRaw.(*Policy)
p.l.Lock()
@ -409,7 +434,9 @@ func (lm *LockManager) DeletePolicy(ctx context.Context, storage logical.Storage
atomic.StoreUint32(&p.deleted, 1)
lm.cache.Delete(name)
if lm.useCache {
lm.cache.Delete(name)
}
err = storage.Delete(ctx, "policy/"+name)
if err != nil {