Publicize a few storage components for curation.

This commit introduces the publicization of Stop and other
components, which the compaction curator shall take advantage
of.

storage/metric/curator.go

@@ -60,10 +60,10 @@ type watermarkFilter struct {
 // stored samples on-disk.  This is useful to compact sparse sample values into
 // single sample entities to reduce keyspace load on the datastore.
 type Curator struct {
-	// stop functions as a channel that when empty allows the curator to operate.
+	// Stop functions as a channel that when empty allows the curator to operate.
 	// The moment a value is ingested inside of it, the curator goes into drain
 	// mode.
-	stop chan bool
+	Stop chan bool
 }
 
 // watermarkDecoder converts (dto.Fingerprint, dto.MetricHighWatermark) doubles
@@ -142,7 +142,7 @@ func (c Curator) Run(ignoreYoungerThan time.Duration, instant time.Time, process
 		ignoreYoungerThan: ignoreYoungerThan,
 		processor:         processor,
 		status:            status,
-		stop:              c.stop,
+		stop:              c.Stop,
 		stopAt:            instant.Add(-1 * ignoreYoungerThan),
 	}
 
@@ -167,8 +167,8 @@ func (c Curator) Run(ignoreYoungerThan time.Duration, instant time.Time, process
 // drain instructs the curator to stop at the next convenient moment as to not
 // introduce data inconsistencies.
 func (c Curator) Drain() {
-	if len(c.stop) == 0 {
-		c.stop <- true
+	if len(c.Stop) == 0 {
+		c.Stop <- true
 	}
 }
 

storage/metric/leveldb.go

@@ -37,13 +37,13 @@ var (
 )
 
 type LevelDBMetricPersistence struct {
-	curationRemarks         *leveldb.LevelDBPersistence
+	CurationRemarks         *leveldb.LevelDBPersistence
 	fingerprintToMetrics    *leveldb.LevelDBPersistence
 	labelNameToFingerprints *leveldb.LevelDBPersistence
 	labelSetToFingerprints  *leveldb.LevelDBPersistence
-	metricHighWatermarks    *leveldb.LevelDBPersistence
+	MetricHighWatermarks    *leveldb.LevelDBPersistence
 	metricMembershipIndex   *index.LevelDBMembershipIndex
-	metricSamples           *leveldb.LevelDBPersistence
+	MetricSamples           *leveldb.LevelDBPersistence
 }
 
 var (
@@ -65,13 +65,13 @@ type leveldbCloser interface {
 
 func (l *LevelDBMetricPersistence) Close() {
 	var persistences = []leveldbCloser{
-		l.curationRemarks,
+		l.CurationRemarks,
 		l.fingerprintToMetrics,
 		l.labelNameToFingerprints,
 		l.labelSetToFingerprints,
-		l.metricHighWatermarks,
+		l.MetricHighWatermarks,
 		l.metricMembershipIndex,
-		l.metricSamples,
+		l.MetricSamples,
 	}
 
 	closerGroup := sync.WaitGroup{}
@@ -110,7 +110,7 @@ func NewLevelDBMetricPersistence(baseDirectory string) (*LevelDBMetricPersistenc
 			"Samples by Fingerprint",
 			func() {
 				var err error
-				emission.metricSamples, err = leveldb.NewLevelDBPersistence(baseDirectory+"/samples_by_fingerprint", *samplesByFingerprintCacheSize, 10)
+				emission.MetricSamples, err = leveldb.NewLevelDBPersistence(baseDirectory+"/samples_by_fingerprint", *samplesByFingerprintCacheSize, 10)
 				workers.MayFail(err)
 			},
 		},
@@ -118,7 +118,7 @@ func NewLevelDBMetricPersistence(baseDirectory string) (*LevelDBMetricPersistenc
 			"High Watermarks by Fingerprint",
 			func() {
 				var err error
-				emission.metricHighWatermarks, err = leveldb.NewLevelDBPersistence(baseDirectory+"/high_watermarks_by_fingerprint", *highWatermarkCacheSize, 10)
+				emission.MetricHighWatermarks, err = leveldb.NewLevelDBPersistence(baseDirectory+"/high_watermarks_by_fingerprint", *highWatermarkCacheSize, 10)
 				workers.MayFail(err)
 			},
 		},
@@ -150,7 +150,7 @@ func NewLevelDBMetricPersistence(baseDirectory string) (*LevelDBMetricPersistenc
 			"Sample Curation Remarks",
 			func() {
 				var err error
-				emission.curationRemarks, err = leveldb.NewLevelDBPersistence(baseDirectory+"/curation_remarks", *curationRemarksCacheSize, 10)
+				emission.CurationRemarks, err = leveldb.NewLevelDBPersistence(baseDirectory+"/curation_remarks", *curationRemarksCacheSize, 10)
 				workers.MayFail(err)
 			},
 		},
@@ -501,7 +501,7 @@ func (l *LevelDBMetricPersistence) refreshHighWatermarks(groups map[model.Finger
 		keyEncoded := coding.NewProtocolBuffer(key)
 
 		key.Signature = proto.String(fingerprint.ToRowKey())
-		raw, err = l.metricHighWatermarks.Get(keyEncoded)
+		raw, err = l.MetricHighWatermarks.Get(keyEncoded)
 		if err != nil {
 			return
 		}
@@ -521,7 +521,7 @@ func (l *LevelDBMetricPersistence) refreshHighWatermarks(groups map[model.Finger
 		mutationCount++
 	}
 
-	err = l.metricHighWatermarks.Commit(batch)
+	err = l.MetricHighWatermarks.Commit(batch)
 	if err != nil {
 		return
 	}
@@ -596,7 +596,7 @@ func (l *LevelDBMetricPersistence) AppendSamples(samples model.Samples) (err err
 		}
 	}
 
-	err = l.metricSamples.Commit(samplesBatch)
+	err = l.MetricSamples.Commit(samplesBatch)
 	if err != nil {
 		return
 	}

storage/metric/processor_test.go

@@ -852,7 +852,7 @@ func TestCuratorCompactionProcessor(t *testing.T) {
 		defer close(stop)
 
 		c := Curator{
-			stop: stop,
+			Stop: stop,
 		}
 
 		err = c.Run(scenario.in.ignoreYoungerThan, testInstant, scenario.in.processor, curatorStates, samples, watermarkStates, updates)

storage/metric/stochastic_test.go

@@ -199,7 +199,7 @@ func levelDBGetRangeValues(l *LevelDBMetricPersistence, fp model.Fingerprint, i
 		return
 	}
 
-	iterator := l.metricSamples.NewIterator(true)
+	iterator := l.MetricSamples.NewIterator(true)
 	defer iterator.Close()
 
 	for valid := iterator.Seek(e); valid; valid = iterator.Next() {

storage/metric/tiered.go

@@ -370,7 +370,7 @@ func (t *tieredStorage) renderView(viewJob viewJob) {
 		scans = viewJob.builder.ScanJobs()
 		view  = newView()
 		// Get a single iterator that will be used for all data extraction below.
-		iterator = t.diskStorage.metricSamples.NewIterator(true)
+		iterator = t.diskStorage.MetricSamples.NewIterator(true)
 	)
 	defer iterator.Close()