fix statick check errors (#475)

fix the tests for `check_license` and `staticcheck`

the static check also found some actual bugs.

Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>

.travis.yml

@@ -15,10 +15,10 @@ go_import_path: github.com/prometheus/tsdb
 
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then choco install make; fi
-  
+
 install:
-  - go get -v -t ./...
+  - make deps
 
 script:
   # `staticcheck` target is omitted due to linting errors
-  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then make test; else make check_license style unused test; fi
+  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then make test; else make; fi

Makefile

@@ -18,11 +18,15 @@ TSDB_BENCHMARK_NUM_METRICS ?= 1000
 TSDB_BENCHMARK_DATASET ?= "$(TSDB_PROJECT_DIR)/testdata/20kseries.json"
 TSDB_BENCHMARK_OUTPUT_DIR ?= "$(TSDB_CLI_DIR)/benchout"
 
-STATICCHECK_IGNORE =
 include Makefile.common
 
+.PHONY: deps
+deps:
+	@echo ">> getting dependencies"
+	GO111MODULE=$(GO111MODULE) $(GO) get $(GOOPTS) -t ./...
+
 build:
-	@$(GO) build -o $(TSDB_BIN) $(TSDB_CLI_DIR)
+	GO111MODULE=$(GO111MODULE) $(GO) build -o $(TSDB_BIN) $(TSDB_CLI_DIR)
 
 bench: build
 	@echo ">> running benchmark, writing result to $(TSDB_BENCHMARK_OUTPUT_DIR)"

checkpoint_test.go

@@ -31,11 +31,11 @@ func TestLastCheckpoint(t *testing.T) {
 	testutil.Ok(t, err)
 	defer os.RemoveAll(dir)
 
-	s, k, err := LastCheckpoint(dir)
+	_, _, err = LastCheckpoint(dir)
 	testutil.Equals(t, ErrNotFound, err)
 
 	testutil.Ok(t, os.MkdirAll(filepath.Join(dir, "checkpoint.0000"), 0777))
-	s, k, err = LastCheckpoint(dir)
+	s, k, err := LastCheckpoint(dir)
 	testutil.Ok(t, err)
 	testutil.Equals(t, filepath.Join(dir, "checkpoint.0000"), s)
 	testutil.Equals(t, 0, k)

cmd/tsdb/main.go

@@ -51,7 +51,7 @@ func main() {
 		listPath             = listCmd.Arg("db path", "database path (default is "+filepath.Join("benchout", "storage")+")").Default(filepath.Join("benchout", "storage")).String()
 		analyzeCmd           = cli.Command("analyze", "analyze churn, label pair cardinality.")
 		analyzePath          = analyzeCmd.Arg("db path", "database path (default is "+filepath.Join("benchout", "storage")+")").Default(filepath.Join("benchout", "storage")).String()
-		analyzeBlockId       = analyzeCmd.Arg("block id", "block to analyze (default is the last block)").String()
+		analyzeBlockID       = analyzeCmd.Arg("block id", "block to analyze (default is the last block)").String()
 		analyzeLimit         = analyzeCmd.Flag("limit", "how many items to show in each list").Default("20").Int()
 	)
 
@@ -76,9 +76,9 @@ func main() {
 		}
 		blocks := db.Blocks()
 		var block *tsdb.Block
-		if *analyzeBlockId != "" {
+		if *analyzeBlockID != "" {
 			for _, b := range blocks {
-				if b.Meta().ULID.String() == *analyzeBlockId {
+				if b.Meta().ULID.String() == *analyzeBlockID {
 					block = b
 					break
 				}
@@ -455,15 +455,17 @@ func analyzeBlock(b *tsdb.Block, limit int) {
 	lbls := labels.Labels{}
 	chks := []chunks.Meta{}
 	for p.Next() {
-		err = ir.Series(p.At(), &lbls, &chks)
+		if err = ir.Series(p.At(), &lbls, &chks); err != nil {
+			exitWithError(err)
+		}
 		// Amount of the block time range not covered by this series.
 		uncovered := uint64(meta.MaxTime-meta.MinTime) - uint64(chks[len(chks)-1].MaxTime-chks[0].MinTime)
 		for _, lbl := range lbls {
 			key := lbl.Name + "=" + lbl.Value
 			labelsUncovered[lbl.Name] += uncovered
 			labelpairsUncovered[key] += uncovered
-			labelpairsCount[key] += 1
-			entries += 1
+			labelpairsCount[key]++
+			entries++
 		}
 	}
 	if p.Err() != nil {

db_test.go

@@ -1522,6 +1522,7 @@ func TestBlockRanges(t *testing.T) {
 	_, err = app.Add(lbl, secondBlockMaxt+3, rand.Float64())
 	testutil.Ok(t, err)
 	_, err = app.Add(lbl, secondBlockMaxt+4, rand.Float64())
+	testutil.Ok(t, err)
 	testutil.Ok(t, app.Commit())
 	testutil.Ok(t, db.Close())
 

head.go

@@ -685,6 +685,7 @@ func (h *Head) getAppendBuffer() []RefSample {
 }
 
 func (h *Head) putAppendBuffer(b []RefSample) {
+	//lint:ignore SA6002 safe to ignore and actually fixing it has some performance penalty.
 	h.appendPool.Put(b[:0])
 }
 
@@ -697,6 +698,7 @@ func (h *Head) getBytesBuffer() []byte {
 }
 
 func (h *Head) putBytesBuffer(b []byte) {
+	//lint:ignore SA6002 safe to ignore and actually fixing it has some performance penalty.
 	h.bytesPool.Put(b[:0])
 }
 

head_test.go

@@ -390,8 +390,8 @@ Outer:
 func TestDeleteUntilCurMax(t *testing.T) {
 	numSamples := int64(10)
 	hb, err := NewHead(nil, nil, nil, 1000000)
-	defer hb.Close()
 	testutil.Ok(t, err)
+	defer hb.Close()
 	app := hb.Appender()
 	smpls := make([]float64, numSamples)
 	for i := int64(0); i < numSamples; i++ {
@@ -677,7 +677,7 @@ func TestMemSeries_append(t *testing.T) {
 
 	ok, chunkCreated = s.append(1000, 3)
 	testutil.Assert(t, ok, "append failed")
-	testutil.Assert(t, ok, "expected new chunk on boundary")
+	testutil.Assert(t, chunkCreated, "expected new chunk on boundary")
 
 	ok, chunkCreated = s.append(1001, 4)
 	testutil.Assert(t, ok, "append failed")

index/index_test.go

@@ -339,6 +339,7 @@ func TestPersistence_index_e2e(t *testing.T) {
 		testutil.Ok(t, err)
 
 		expp, err := mi.Postings(p.Name, p.Value)
+		testutil.Ok(t, err)
 
 		var lset, explset labels.Labels
 		var chks, expchks []chunks.Meta
@@ -352,6 +353,7 @@ func TestPersistence_index_e2e(t *testing.T) {
 			testutil.Ok(t, err)
 
 			err = mi.Series(expp.At(), &explset, &expchks)
+			testutil.Ok(t, err)
 			testutil.Equals(t, explset, lset)
 			testutil.Equals(t, expchks, chks)
 		}

labels/labels_test.go

@@ -150,7 +150,7 @@ func BenchmarkMapFromLabels(b *testing.B) {
 	b.ReportAllocs()
 
 	for i := 0; i < b.N; i++ {
-		m = ls.Map()
+		_ = ls.Map()
 	}
 }
 

querier.go

@@ -581,11 +581,9 @@ func (s *populatedChunkSeries) Next() bool {
 				// This means that the chunk has be garbage collected. Remove it from the list.
 				if s.err == ErrNotFound {
 					s.err = nil
-
 					// Delete in-place.
-					chks = append(chks[:j], chks[j+1:]...)
+					s.chks = append(chks[:j], chks[j+1:]...)
 				}
-
 				return false
 			}
 		}

repair_test.go

@@ -65,7 +65,7 @@ func TestRepairBadIndexVersion(t *testing.T) {
 
 	// Check the current db.
 	// In its current state, lookups should fail with the fixed code.
-	meta, err := readMetaFile(dbDir)
+	_, err := readMetaFile(dbDir)
 	testutil.NotOk(t, err)
 
 	// Touch chunks dir in block.
@@ -116,7 +116,7 @@ func TestRepairBadIndexVersion(t *testing.T) {
 		{{"a", "2"}, {"b", "1"}},
 	}, res)
 
-	meta, err = readMetaFile(tmpDbDir)
+	meta, err := readMetaFile(tmpDbDir)
 	testutil.Ok(t, err)
 	testutil.Assert(t, meta.Version == 1, "unexpected meta version %d", meta.Version)
 }

staticcheck.conf

@@ -0,0 +1,2 @@
+# Enable only "legacy" staticcheck verifications.
+checks = [ "SA*" ]

wal.go

@@ -888,16 +888,19 @@ func (r *walReader) Read(
 				if seriesf != nil {
 					seriesf(v)
 				}
+				//lint:ignore SA6002 safe to ignore and actually fixing it has some performance penalty.
 				seriesPool.Put(v[:0])
 			case []RefSample:
 				if samplesf != nil {
 					samplesf(v)
 				}
+				//lint:ignore SA6002 safe to ignore and actually fixing it has some performance penalty.
 				samplePool.Put(v[:0])
 			case []Stone:
 				if deletesf != nil {
 					deletesf(v)
 				}
+				//lint:ignore SA6002 safe to ignore and actually fixing it has some performance penalty.
 				deletePool.Put(v[:0])
 			default:
 				level.Error(r.logger).Log("msg", "unexpected data type")

wal_test.go

@@ -290,7 +290,7 @@ func TestWALRestoreCorrupted_invalidSegment(t *testing.T) {
 
 	testutil.Ok(t, wal.Close())
 
-	wal, err = OpenSegmentWAL(dir, log.NewLogfmtLogger(os.Stderr), 0, nil)
+	_, err = OpenSegmentWAL(dir, log.NewLogfmtLogger(os.Stderr), 0, nil)
 	testutil.Ok(t, err)
 
 	fns, err := fileutil.ReadDir(dir)