func actualRemovePeer(future *removePeerFuture) {
defer close(future.resultChannel)
future.ctx.Debugf("[RemovePeer] Removing peer: (hash: %s) (ID: %s)", future.hash, future.peerID)
err := ds.Delete(future.ctx, getPeerKey(future.ctx, future.hash, future.peerID))
if err == nil {
future.ctx.Debugf("[RemovePeer] Deleted peer from datastore.")
for removalsAttempted := 1; removalsAttempted <= 3; removalsAttempted++ {
future.ctx.Debugf("[RemovePeer] Attempting cache removal #%d", removalsAttempted)
var peers []*Peer
if peersItem, memcacheErr := memcache.Gob.Get(future.ctx, getHashKey(future.ctx, future.hash), &peers); memcacheErr == nil {
for i, peer := range peers {
if peer.ID == future.peerID {
peers = append(peers[:i], peers[i+1:]...)
}
}
peersItem.Object = peers
memcacheErr := memcache.Gob.CompareAndSwap(future.ctx, peersItem)
if memcacheErr == nil {
future.ctx.Debugf("[RemovePeer] Deleted peer from cached peer list.")
break
} else if memcacheErr == memcache.ErrCASConflict {
future.ctx.Debugf("[RemovePeer] Cached peer list conflicted during modification: %s", memcacheErr)
continue
} else if memcacheErr == memcache.ErrNotStored {
future.ctx.Debugf("[RemovePeer] Cached peer list was deleted during modification: %s", memcacheErr)
break
} else {
future.ctx.Errorf("[RemovePeer] Error when attempting to set cached peer list using CAS: %s", memcacheErr)
future.resultChannel <- memcacheErr
return
}
} else if memcacheErr == memcache.ErrCacheMiss {
future.ctx.Debugf("[RemovePeer] Peer list not cached.")
break
} else if appengine.IsCapabilityDisabled(memcacheErr) {
future.ctx.Warningf("[RemovePeer] Memcache capability is disabled.")
break
} else {
future.ctx.Errorf("[RemovePeer] Error when attempting to get cache list for deletion: %s", memcacheErr)
future.resultChannel <- memcacheErr
return
}
}
} else if err == dserrors.ErrNoSuchEntity {
future.ctx.Debugf("[RemovePeer] Peer does not exist in datastore")
return
}
future.ctx.Debugf("[RemovePeer] Successfully removed peer")
if err != nil {
future.resultChannel <- err
}
}
func (e *Token) Delete(c context.Context) error {
return ds.Delete(c, e.Key)
}
