Add list blocks command to CLI

cmd/tsdb/main.go

@@ -43,6 +43,8 @@ func main() {
 		benchWriteOutPath    = benchWriteCmd.Flag("out", "set the output path").Default("benchout/").String()
 		benchWriteNumMetrics = benchWriteCmd.Flag("metrics", "number of metrics to read").Default("10000").Int()
 		benchSamplesFile     = benchWriteCmd.Arg("file", "input file with samples data, default is (../../testdata/20k.series)").Default("../../testdata/20k.series").String()
+		listCmd              = cli.Command("ls", "list db blocks")
+		listPath             = listCmd.Arg("db path", "database path").Default("benchout/storage").String()
 	)
 
 	switch kingpin.MustParse(cli.Parse(os.Args[1:])) {
@@ -53,6 +55,12 @@ func main() {
 			samplesFile: *benchSamplesFile,
 		}
 		wb.run()
+	case listCmd.FullCommand():
+		db, err := tsdb.Open(*listPath, nil, nil, nil)
+		if err != nil {
+			exitWithError(err)
+		}
+		fmt.Println(db.PrintBlocks())
 	}
 	flag.CommandLine.Set("log.level", "debug")
 }

db.go

@@ -38,6 +38,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/tsdb/chunks"
 	"github.com/prometheus/tsdb/labels"
+	"github.com/ryanuber/columnize"
 )
 
 // DefaultOptions used for the DB. They are sane for setups using
@@ -228,6 +229,25 @@ func (db *DB) Dir() string {
 	return db.dir
 }
 
+func (db *DB) PrintBlocks() string {
+	db.mtx.RLock()
+	defer db.mtx.RUnlock()
+
+	var output []string
+	output = append(output, "BLOCK ULID | MIN TIME | MAX TIME | NUM SAMPLES | NUM CHUNKS | NUM SERIES")
+	for _, b := range db.blocks {
+		output = append(output, fmt.Sprintf("%v | %v | %v | %v | %v | %v",
+			b.Meta().ULID,
+			b.Meta().MinTime,
+			b.Meta().MaxTime,
+			b.Meta().Stats.NumSamples,
+			b.Meta().Stats.NumChunks,
+			b.Meta().Stats.NumSeries,
+		))
+	}
+	return columnize.SimpleFormat(output)
+}
+
 func (db *DB) run() {
 	defer close(db.donec)