Makefile: enable golangci-lint in make check_all

Makefile

@@ -56,10 +56,15 @@ errcheck: install-errcheck
 install-errcheck:
 	which errcheck || GO111MODULE=off go get -u github.com/kisielk/errcheck
 
+check_all: fmt vet lint errcheck golangci-lint
+
 test:
 	GO111MODULE=on go test -mod=vendor ./lib/...
 	GO111MODULE=on go test -mod=vendor ./app/...
 
+test_full:
+	GO111MODULE=on go test -mod=vendor -coverprofile=coverage.txt -covermode=atomic ./lib/... ./app/...
+
 benchmark:
 	GO111MODULE=on go test -mod=vendor -bench=. ./lib/...
 	GO111MODULE=on go test -mod=vendor -bench=. ./app/...
@@ -81,7 +86,7 @@ install-qtc:
 
 
 golangci-lint: install-golangci-lint
-	golangci-lint run
+	golangci-lint run --exclude '(SA4003|SA1019):' -D errcheck
 
 install-golangci-lint:
 	which golangci-lint || GO111MODULE=off go get -u github.com/golangci/golangci-lint/cmd/golangci-lint

lib/memory/limiter.go

@@ -0,0 +1,41 @@
+package memory
+
+import (
+	"sync"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+)
+
+// Limiter is the memory limiter.
+//
+// It limits memory to MaxSize.
+type Limiter struct {
+	// The maximum allowed memory
+	MaxSize uint64
+
+	mu    sync.Mutex
+	usage uint64
+}
+
+// Get obtains n bytes of memory from ml.
+//
+// It returns true on success, false on error.
+func (ml *Limiter) Get(n uint64) bool {
+	ml.mu.Lock()
+	ok := n <= ml.MaxSize && ml.MaxSize-n >= ml.usage
+	if ok {
+		ml.usage += n
+	}
+	ml.mu.Unlock()
+	return ok
+}
+
+// Put returns back n bytes of memory to ml.
+func (ml *Limiter) Put(n uint64) {
+	ml.mu.Lock()
+	if n > ml.usage {
+		logger.Panicf("BUG: n=%d cannot exceed %d", n, ml.usage)
+	}
+	ml.usage -= n
+	ml.mu.Unlock()
+}

lib/memory/limiter_test.go

@@ -0,0 +1,56 @@
+package memory
+
+import (
+	"testing"
+)
+
+func TestLimiter(t *testing.T) {
+	var ml Limiter
+	ml.MaxSize = 100
+
+	// Allocate memory
+	if !ml.Get(10) {
+		t.Fatalf("cannot get 10 out of %d bytes", ml.MaxSize)
+	}
+	if ml.usage != 10 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 10)
+	}
+	if !ml.Get(20) {
+		t.Fatalf("cannot get 20 out of 90 bytes")
+	}
+	if ml.usage != 30 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 30)
+	}
+	if ml.Get(1000) {
+		t.Fatalf("unexpected get for 1000 bytes")
+	}
+	if ml.usage != 30 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 30)
+	}
+	if ml.Get(71) {
+		t.Fatalf("unexpected get for 71 bytes")
+	}
+	if ml.usage != 30 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 30)
+	}
+	if !ml.Get(70) {
+		t.Fatalf("cannot get 70 bytes")
+	}
+	if ml.usage != 100 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 100)
+	}
+
+	// Return memory back
+	ml.Put(10)
+	ml.Put(70)
+	if ml.usage != 20 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 20)
+	}
+	if !ml.Get(30) {
+		t.Fatalf("cannot get 30 bytes")
+	}
+	ml.Put(50)
+	if ml.usage != 0 {
+		t.Fatalf("unexpected usage; got %d; want %d", ml.usage, 0)
+	}
+}

lib/storage/search_test.go

@@ -38,7 +38,7 @@ func TestSearchQueryMarshalUnmarshal(t *testing.T) {
 		if len(tail) > 0 {
 			t.Fatalf("unexpected tail left after SearchQuery unmarshaling; tail (len=%d): %q", len(tail), tail)
 		}
-		if sq1.AccountID != sq1.AccountID {
+		if sq2.AccountID != sq1.AccountID {
 			t.Fatalf("unexpected AccountID; got %d; want %d", sq2.AccountID, sq1.AccountID)
 		}
 		if sq2.ProjectID != sq1.ProjectID {