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Make KeyValueStore.Delete report if the key to delete was found.

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Previously, it would return an error instead. Now we can distinguish
the cases 'error while deleting known key' vs. 'key not in index'
without testing for leveldb-internal kinds of errors.
This commit is contained in:
Bjoern Rabenstein 2015-01-29 12:57:50 +01:00
parent 4e0d2f9820
commit 73f6dc4d44
3 changed files with 43 additions and 18 deletions
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4
storage/local/index/interface.go
View File

@ -29,8 +29,8 @@ type KeyValueStore interface {
// could be found for key. If value is nil, Get behaves like Has.
Get(key encoding.BinaryMarshaler, value encoding.BinaryUnmarshaler) (bool, error)
Has(key encoding.BinaryMarshaler) (bool, error)
// Delete returns an error if key does not exist.
Delete(key encoding.BinaryMarshaler) error
// Delete returns (false, nil) if key does not exist.
Delete(key encoding.BinaryMarshaler) (bool, error)
NewBatch() Batch
Commit(b Batch) error

13
storage/local/index/leveldb.go
View File

@ -104,12 +104,19 @@ func (l *LevelDB) Has(key encoding.BinaryMarshaler) (has bool, err error) {
}
// Delete implements KeyValueStore.
func (l *LevelDB) Delete(key encoding.BinaryMarshaler) error {
func (l *LevelDB) Delete(key encoding.BinaryMarshaler) (bool, error) {
k, err := key.MarshalBinary()
if err != nil {
return err
return false, err
}
return l.storage.Delete(k, l.writeOpts)
err = l.storage.Delete(k, l.writeOpts)
if err == leveldb.ErrNotFound {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
}
// Put implements KeyValueStore.

44
storage/local/persistence.go
View File

@ -535,16 +535,13 @@ func (p *persistence) cleanUpArchiveIndexes(
if !fpSeen {
glog.Warningf("Archive clean-up: Fingerprint %v is unknown. Purging from archive indexes.", clientmodel.Fingerprint(fp))
}
if err := p.archivedFingerprintToMetrics.Delete(fp); err != nil {
// It's fine if the fp is not in the archive indexes.
if _, err := p.archivedFingerprintToMetrics.Delete(fp); err != nil {
return err
}
// Delete from timerange index, too.
p.archivedFingerprintToTimeRange.Delete(fp)
// TODO: Ignoring errors here as fp might not be in
// timerange index (which is good) but which would
// return an error. Delete signature could be changed
// like the Get signature to detect a real error.
return nil
_, err := p.archivedFingerprintToTimeRange.Delete(fp)
return err
}
// fp is legitimately archived. Make sure it is in timerange index, too.
has, err := p.archivedFingerprintToTimeRange.Has(fp)
@ -555,7 +552,8 @@ func (p *persistence) cleanUpArchiveIndexes(
return nil // All good.
}
glog.Warningf("Archive clean-up: Fingerprint %v is not in time-range index. Unarchiving it for recovery.")
if err := p.archivedFingerprintToMetrics.Delete(fp); err != nil {
// Again, it's fine if fp is not in the archive index.
if _, err := p.archivedFingerprintToMetrics.Delete(fp); err != nil {
return err
}
if err := kv.Value(&m); err != nil {
@ -590,9 +588,13 @@ func (p *persistence) cleanUpArchiveIndexes(
return nil // All good.
}
glog.Warningf("Archive clean-up: Purging unknown fingerprint %v in time-range index.", fp)
if err := p.archivedFingerprintToTimeRange.Delete(fp); err != nil {
deleted, err := p.archivedFingerprintToTimeRange.Delete(fp)
if err != nil {
return err
}
if !deleted {
glog.Errorf("Fingerprint %s to be deleted from archivedFingerprintToTimeRange not found. This should never happen.", fp)
}
return nil
}); err != nil {
return err
@ -1303,12 +1305,20 @@ func (p *persistence) dropArchivedMetric(fp clientmodel.Fingerprint) (err error)
if err != nil || metric == nil {
return err
}
if err := p.archivedFingerprintToMetrics.Delete(codable.Fingerprint(fp)); err != nil {
deleted, err := p.archivedFingerprintToMetrics.Delete(codable.Fingerprint(fp))
if err != nil {
return err
}
if err := p.archivedFingerprintToTimeRange.Delete(codable.Fingerprint(fp)); err != nil {
if !deleted {
glog.Errorf("Tried to delete non-archived fingerprint %s from archivedFingerprintToMetrics index. This should never happen.", fp)
}
deleted, err = p.archivedFingerprintToTimeRange.Delete(codable.Fingerprint(fp))
if err != nil {
return err
}
if !deleted {
glog.Errorf("Tried to delete non-archived fingerprint %s from archivedFingerprintToTimeRange index. This should never happen.", fp)
}
p.unindexMetric(fp, metric)
return nil
}
@ -1332,12 +1342,20 @@ func (p *persistence) unarchiveMetric(fp clientmodel.Fingerprint) (
if err != nil || !has {
return false, firstTime, err
}
if err := p.archivedFingerprintToMetrics.Delete(codable.Fingerprint(fp)); err != nil {
deleted, err := p.archivedFingerprintToMetrics.Delete(codable.Fingerprint(fp))
if err != nil {
return false, firstTime, err
}
if err := p.archivedFingerprintToTimeRange.Delete(codable.Fingerprint(fp)); err != nil {
if !deleted {
glog.Errorf("Tried to delete non-archived fingerprint %s from archivedFingerprintToMetrics index. This should never happen.", fp)
}
deleted, err = p.archivedFingerprintToTimeRange.Delete(codable.Fingerprint(fp))
if err != nil {
return false, firstTime, err
}
if !deleted {
glog.Errorf("Tried to delete non-archived fingerprint %s from archivedFingerprintToTimeRange index. This should never happen.", fp)
}
return true, firstTime, nil
}