apptest: typical cluster configuration for business logic tests

Add the ability to create a simple cluster configuration for tests that
do not verify the cluster-specific behavior but instead are focused on
the business logic tests, such as API surface or MetricsQL. For such
tests this cluster configuration will be enough in most cases.

Cluster-specific tests should continue creating custom configurations.

---------

Signed-off-by: Artem Fetishev <rtm@victoriametrics.com>

.github/workflows/main.yml

@@ -91,3 +91,32 @@ jobs:
         uses: codecov/codecov-action@v4
         with:
           file: ./coverage.txt
+
+  integration-test:
+    name: integration-test
+    needs: [lint, test]
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Code checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        id: go
+        uses: actions/setup-go@v5
+        with:
+          cache: false
+          go-version: stable
+
+      - name: Cache Go artifacts
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/bin
+            ~/go/pkg/mod
+          key: go-artifacts-${{ runner.os }}-${{ matrix.scenario }}-${{ steps.go.outputs.go-version }}-${{ hashFiles('go.sum', 'Makefile', 'app/**/Makefile') }}
+          restore-keys: go-artifacts-${{ runner.os }}-${{ matrix.scenario }}-
+
+      - name: Run integration tests
+        run: make integration-test

Makefile

@@ -219,7 +219,7 @@ test-full-386:
 	DISABLE_FSYNC_FOR_TESTING=1 GOARCH=386 go test -coverprofile=coverage.txt -covermode=atomic ./lib/... ./app/...
 
 integration-test: all
-	go test ./apptest/... -skip="^TestSingle.*"
+	go test ./apptest/... -skip="^TestSingle.*" -v
 
 benchmark:
 	go test -bench=. ./lib/...

apptest/client.go

@@ -128,3 +128,31 @@ func (app *ServesMetrics) GetMetric(t *testing.T, metricName string) float64 {
 	t.Fatalf("metic not found: %s", metricName)
 	return 0
 }
+
+// GetMetricsByPrefix retrieves the values of all metrics that start with given
+// prefix.
+func (app *ServesMetrics) GetMetricsByPrefix(t *testing.T, prefix string) []float64 {
+	t.Helper()
+
+	values := []float64{}
+
+	metrics := app.cli.Get(t, app.metricsURL, http.StatusOK)
+	for _, metric := range strings.Split(metrics, "\n") {
+		if !strings.HasPrefix(metric, prefix) {
+			continue
+		}
+
+		parts := strings.Split(metric, " ")
+		if len(parts) < 2 {
+			t.Fatalf("unexpected record format: got %q, want metric name and value separated by a space", metric)
+		}
+
+		value, err := strconv.ParseFloat(parts[len(parts)-1], 64)
+		if err != nil {
+			t.Fatalf("could not parse metric value %s: %v", metric, err)
+		}
+
+		values = append(values, value)
+	}
+	return values
+}

apptest/model.go

@@ -3,7 +3,9 @@ package apptest
 import (
 	"encoding/json"
 	"fmt"
+	"slices"
 	"strconv"
+	"strings"
 	"testing"
 	"time"
 )
@@ -20,6 +22,20 @@ type PrometheusWriter interface {
 	PrometheusAPIV1ImportPrometheus(t *testing.T, records []string, opts QueryOpts)
 }
 
+// StorageFlusher defines a method that forces the flushing of data inserted
+// into the storage, so it becomes available for searching immediately.
+type StorageFlusher interface {
+	ForceFlush(t *testing.T)
+}
+
+// PrometheusWriteQuerier encompasses the methods for writing, flushing and
+// querying the data.
+type PrometheusWriteQuerier interface {
+	PrometheusWriter
+	PrometheusQuerier
+	StorageFlusher
+}
+
 // QueryOpts contains various params used for querying or ingesting data
 type QueryOpts struct {
 	Tenant  string
@@ -119,3 +135,19 @@ func NewPrometheusAPIV1SeriesResponse(t *testing.T, s string) *PrometheusAPIV1Se
 	}
 	return res
 }
+
+// Sort sorts the response data.
+func (r *PrometheusAPIV1SeriesResponse) Sort() {
+	str := func(m map[string]string) string {
+		s := []string{}
+		for k, v := range m {
+			s = append(s, k+v)
+		}
+		slices.Sort(s)
+		return strings.Join(s, "")
+	}
+
+	slices.SortFunc(r.Data, func(a, b map[string]string) int {
+		return strings.Compare(str(a), str(b))
+	})
+}

apptest/testcase.go

@@ -1,9 +1,12 @@
 package apptest
 
 import (
+	"fmt"
 	"testing"
+	"time"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
+	"github.com/google/go-cmp/cmp"
 )
 
 // TestCase holds the state and defines clean-up procedure common for all test
@@ -103,6 +106,124 @@ func (tc *TestCase) MustStartVminsert(instance string, flags []string) *Vminsert
 	return app
 }
 
+type vmcluster struct {
+	*Vminsert
+	*Vmselect
+	vmstorages []*Vmstorage
+}
+
+func (c *vmcluster) ForceFlush(t *testing.T) {
+	for _, s := range c.vmstorages {
+		s.ForceFlush(t)
+	}
+}
+
+// MustStartCluster is a typical cluster configuration.
+//
+// The cluster consists of two vmstorages, one vminsert and one vmselect, no
+// data replication.
+//
+// Such configuration is suitable for tests that don't verify the
+// cluster-specific behavior (such as sharding, replication, or multilevel
+// vmselect) but instead just need a typical cluster configuration to verify
+// some business logic (such as API surface, or MetricsQL). Such cluster
+// tests usually come paired with corresponding vmsingle tests.
+func (tc *TestCase) MustStartCluster() PrometheusWriteQuerier {
+	tc.t.Helper()
+
+	vmstorage1 := tc.MustStartVmstorage("vmstorage-1", []string{
+		"-storageDataPath=" + tc.Dir() + "/vmstorage-1",
+		"-retentionPeriod=100y",
+	})
+	vmstorage2 := tc.MustStartVmstorage("vmstorage-2", []string{
+		"-storageDataPath=" + tc.Dir() + "/vmstorage-2",
+		"-retentionPeriod=100y",
+	})
+	vminsert := tc.MustStartVminsert("vminsert", []string{
+		"-storageNode=" + vmstorage1.VminsertAddr() + "," + vmstorage2.VminsertAddr(),
+	})
+	vmselect := tc.MustStartVmselect("vmselect", []string{
+		"-storageNode=" + vmstorage1.VmselectAddr() + "," + vmstorage2.VmselectAddr(),
+	})
+
+	return &vmcluster{vminsert, vmselect, []*Vmstorage{vmstorage1, vmstorage2}}
+}
+
 func (tc *TestCase) addApp(app Stopper) {
 	tc.startedApps = append(tc.startedApps, app)
 }
+
+// AssertOptions hold the assertion params, such as got and wanted values as
+// well as the message that should be included into the assertion error message
+// in case of failure.
+//
+// In VictoriaMetrics (especially the cluster version) the inserted data does
+// not become visible for querying right away. Therefore, the first comparisons
+// may fail. AssertOptions allow to configure how many times the actual result
+// must be retrieved and compared with the expected one and for long to wait
+// between the retries. If these two params (`Retries` and `Period`) are not
+// set, the default values will be used.
+//
+// If it is known that the data is available, then the retry functionality can
+// be disabled by setting the `DoNotRetry` field.
+//
+// AssertOptions are used by the TestCase.Assert() method, and this method uses
+// cmp.Diff() from go-cmp package for comparing got and wanted values.
+// AssertOptions, therefore, allows to pass cmp.Options to cmp.Diff() via
+// `CmpOpts` field.
+//
+// Finally the `FailNow` field controls whether the assertion should fail using
+// `testing.T.Errorf()` or `testing.T.Fatalf()`.
+type AssertOptions struct {
+	Msg        string
+	Got        func() any
+	Want       any
+	CmpOpts    []cmp.Option
+	DoNotRetry bool
+	Retries    int
+	Period     time.Duration
+	FailNow    bool
+}
+
+// Assert compares the actual result with the expected one possibly multiple
+// times in order to account for the fact that the inserted data does not become
+// available for querying right away (especially in cluster version of
+// VictoriaMetrics).
+func (tc *TestCase) Assert(opts *AssertOptions) {
+	tc.t.Helper()
+
+	const (
+		defaultRetries = 20
+		defaultPeriod  = 100 * time.Millisecond
+	)
+
+	if opts.DoNotRetry {
+		opts.Retries = 1
+		opts.Period = 0
+	} else {
+		if opts.Retries <= 0 {
+			opts.Retries = defaultRetries
+		}
+		if opts.Period <= 0 {
+			opts.Period = defaultPeriod
+		}
+	}
+
+	var diff string
+
+	for range opts.Retries {
+		diff = cmp.Diff(opts.Want, opts.Got(), opts.CmpOpts...)
+		if diff == "" {
+			return
+		}
+		time.Sleep(opts.Period)
+	}
+
+	msg := fmt.Sprintf("%s (-want, +got):\n%s", opts.Msg, diff)
+
+	if opts.FailNow {
+		tc.t.Fatal(msg)
+	} else {
+		tc.t.Error(msg)
+	}
+}

apptest/tests/key_concepts_test.go

@@ -2,7 +2,6 @@ package tests
 
 import (
 	"testing"
-	"time"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/apptest"
 	"github.com/google/go-cmp/cmp"
@@ -29,67 +28,41 @@ var docData = []string{
 }
 
 // TestSingleKeyConceptsQuery verifies cases from https://docs.victoriametrics.com/keyconcepts/#query-data
+// for vm-single.
 func TestSingleKeyConceptsQuery(t *testing.T) {
 	tc := apptest.NewTestCase(t)
 	defer tc.Stop()
 
-	vmsingle := tc.MustStartVmsingle("vmsingle", []string{
+	sut := tc.MustStartVmsingle("vmsingle", []string{
 		"-storageDataPath=" + tc.Dir() + "/vmstorage",
 		"-retentionPeriod=100y",
 	})
 
-	opts := apptest.QueryOpts{Timeout: "5s"}
-
-	// Insert example data from documentation.
-	vmsingle.PrometheusAPIV1ImportPrometheus(t, docData, opts)
-	vmsingle.ForceFlush(t)
-
-	testInstantQuery(t, vmsingle, opts)
-	testRangeQuery(t, vmsingle, opts)
-	testRangeQueryIsEquivalentToManyInstantQueries(t, vmsingle, opts)
+	testKeyConceptsQueryData(t, sut)
 }
 
-// TestClusterKeyConceptsQuery verifies cases from https://docs.victoriametrics.com/keyconcepts/#query-data
-func TestClusterKeyConceptsQuery(t *testing.T) {
+// TestClusterKeyConceptsQueryData verifies cases from https://docs.victoriametrics.com/keyconcepts/#query-data
+// for vm-cluster.
+func TestClusterKeyConceptsQueryData(t *testing.T) {
 	tc := apptest.NewTestCase(t)
 	defer tc.Stop()
 
-	// Set up the following cluster configuration:
-	//
-	// - two vmstorage instances
-	// - vminsert points to the two vmstorages, its replication setting
-	//   is off which means it will only shard the incoming data across the two
-	//   vmstorages.
-	// - vmselect points to the two vmstorages and is expected to query both
-	//   vmstorages and build the full result out of the two partial results.
+	sut := tc.MustStartCluster()
 
-	vmstorage1 := tc.MustStartVmstorage("vmstorage-1", []string{
-		"-storageDataPath=" + tc.Dir() + "/vmstorage-1",
-		"-retentionPeriod=100y",
-	})
-	vmstorage2 := tc.MustStartVmstorage("vmstorage-2", []string{
-		"-storageDataPath=" + tc.Dir() + "/vmstorage-2",
-		"-retentionPeriod=100y",
-	})
-	vminsert := tc.MustStartVminsert("vminsert", []string{
-		"-storageNode=" + vmstorage1.VminsertAddr() + "," + vmstorage2.VminsertAddr(),
-	})
-	vmselect := tc.MustStartVmselect("vmselect", []string{
-		"-storageNode=" + vmstorage1.VmselectAddr() + "," + vmstorage2.VmselectAddr(),
-	})
+	testKeyConceptsQueryData(t, sut)
+}
 
+// testClusterKeyConceptsQuery verifies cases from https://docs.victoriametrics.com/keyconcepts/#query-data
+func testKeyConceptsQueryData(t *testing.T, sut apptest.PrometheusWriteQuerier) {
 	opts := apptest.QueryOpts{Timeout: "5s", Tenant: "0"}
 
 	// Insert example data from documentation.
-	vminsert.PrometheusAPIV1ImportPrometheus(t, docData, opts)
-	time.Sleep(2 * time.Second)
+	sut.PrometheusAPIV1ImportPrometheus(t, docData, opts)
+	sut.ForceFlush(t)
 
-	vmstorage1.ForceFlush(t)
-	vmstorage2.ForceFlush(t)
-
-	testInstantQuery(t, vmselect, opts)
-	testRangeQuery(t, vmselect, opts)
-	testRangeQueryIsEquivalentToManyInstantQueries(t, vmselect, opts)
+	testInstantQuery(t, sut, opts)
+	testRangeQuery(t, sut, opts)
+	testRangeQueryIsEquivalentToManyInstantQueries(t, sut, opts)
 }
 
 // testInstantQuery verifies the statements made in the `Instant query` section

apptest/tests/multilevel_test.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"math/rand/v2"
 	"testing"
-	"time"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/apptest"
 )
@@ -33,30 +32,41 @@ func TestClusterMultilevelSelect(t *testing.T) {
 		"-storageNode=" + vmselectL1.ClusternativeListenAddr(),
 	})
 
-	// Insert 1000 unique time series.Wait for 2 seconds to let vmstorage
-	// flush pending items so they become searchable.
+	// Insert 1000 unique time series.
 
 	const numMetrics = 1000
 	records := make([]string, numMetrics)
+	want := &apptest.PrometheusAPIV1SeriesResponse{
+		Status:    "success",
+		IsPartial: false,
+		Data:      make([]map[string]string, numMetrics),
+	}
 	for i := range numMetrics {
-		records[i] = fmt.Sprintf("metric_%d %d", i, rand.IntN(1000))
+		name := fmt.Sprintf("metric_%d", i)
+		records[i] = fmt.Sprintf("%s %d", name, rand.IntN(1000))
+		want.Data[i] = map[string]string{"__name__": name}
 	}
-	vminsert.PrometheusAPIV1ImportPrometheus(t, records, apptest.QueryOpts{Tenant: "0"})
-	time.Sleep(2 * time.Second)
+	want.Sort()
+	qopts := apptest.QueryOpts{Tenant: "0"}
+	vminsert.PrometheusAPIV1ImportPrometheus(t, records, qopts)
+	vmstorage.ForceFlush(t)
 
-	// Retrieve all time series and verify that vmselect (L1) serves the complete
-	// set of time series.
+	// Retrieve all time series and verify that both vmselect (L1) and
+	// vmselect (L2) serve the complete set of time series.
 
-	seriesL1 := vmselectL1.PrometheusAPIV1Series(t, `{__name__=~".*"}`, apptest.QueryOpts{Tenant: "0"})
-	if got, want := len(seriesL1.Data), numMetrics; got != want {
-		t.Fatalf("unexpected level-1 series count: got %d, want %d", got, want)
-	}
-
-	// Retrieve all time series and verify that vmselect (L2) serves the complete
-	// set of time series.
-
-	seriesL2 := vmselectL2.PrometheusAPIV1Series(t, `{__name__=~".*"}`, apptest.QueryOpts{Tenant: "0"})
-	if got, want := len(seriesL2.Data), numMetrics; got != want {
-		t.Fatalf("unexpected level-2 series count: got %d, want %d", got, want)
+	got := func(app *apptest.Vmselect) any {
+		res := app.PrometheusAPIV1Series(t, `{__name__=~".*"}`, qopts)
+		res.Sort()
+		return res
 	}
+	tc.Assert(&apptest.AssertOptions{
+		Msg:  "unexpected level-1 series count",
+		Got:  func() any { return got(vmselectL1) },
+		Want: want,
+	})
+	tc.Assert(&apptest.AssertOptions{
+		Msg:  "unexpected level-2 series count",
+		Got:  func() any { return got(vmselectL2) },
+		Want: want,
+	})
 }

apptest/tests/sharding_test.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"math/rand/v2"
 	"testing"
-	"time"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/apptest"
 )
@@ -35,20 +34,28 @@ func TestClusterVminsertShardsDataVmselectBuildsFullResultFromShards(t *testing.
 		"-storageNode=" + vmstorage1.VmselectAddr() + "," + vmstorage2.VmselectAddr(),
 	})
 
-	// Insert 1000 unique time series and verify the that inserted data has been
-	// indeed sharded by checking various metrics exposed by vminsert and
-	// vmstorage.
-	// Also wait for 2 seconds to let vminsert and vmstorage servers to update
-	// the values of the metrics they expose and to let vmstorages flush pending
-	// items so they become searchable.
+	// Insert 1000 unique time series.
 
 	const numMetrics = 1000
 	records := make([]string, numMetrics)
-	for i := range numMetrics {
-		records[i] = fmt.Sprintf("metric_%d %d", i, rand.IntN(1000))
+	want := &apptest.PrometheusAPIV1SeriesResponse{
+		Status:    "success",
+		IsPartial: false,
+		Data:      make([]map[string]string, numMetrics),
 	}
-	vminsert.PrometheusAPIV1ImportPrometheus(t, records, apptest.QueryOpts{Tenant: "0"})
-	time.Sleep(2 * time.Second)
+	for i := range numMetrics {
+		name := fmt.Sprintf("metric_%d", i)
+		records[i] = fmt.Sprintf("%s %d", name, rand.IntN(1000))
+		want.Data[i] = map[string]string{"__name__": name}
+	}
+	want.Sort()
+	qopts := apptest.QueryOpts{Tenant: "0"}
+	vminsert.PrometheusAPIV1ImportPrometheus(t, records, qopts)
+	vmstorage1.ForceFlush(t)
+	vmstorage2.ForceFlush(t)
+
+	// Verify that inserted data has been indeed sharded by checking metrics
+	// exposed by vmstorage.
 
 	numMetrics1 := vmstorage1.GetIntMetric(t, "vm_vminsert_metrics_read_total")
 	if numMetrics1 == 0 {
@@ -63,16 +70,15 @@ func TestClusterVminsertShardsDataVmselectBuildsFullResultFromShards(t *testing.
 	}
 
 	// Retrieve all time series and verify that vmselect serves the complete set
-	//of time series.
+	// of time series.
 
-	series := vmselect.PrometheusAPIV1Series(t, `{__name__=~".*"}`, apptest.QueryOpts{Tenant: "0"})
-	if got, want := series.Status, "success"; got != want {
-		t.Fatalf("unexpected /ap1/v1/series response status: got %s, want %s", got, want)
-	}
-	if got, want := series.IsPartial, false; got != want {
-		t.Fatalf("unexpected /ap1/v1/series response isPartial value: got %t, want %t", got, want)
-	}
-	if got, want := len(series.Data), numMetrics; got != want {
-		t.Fatalf("unexpected /ap1/v1/series response series count: got %d, want %d", got, want)
-	}
+	tc.Assert(&apptest.AssertOptions{
+		Msg: "unexpected /api/v1/series response",
+		Got: func() any {
+			res := vmselect.PrometheusAPIV1Series(t, `{__name__=~".*"}`, qopts)
+			res.Sort()
+			return res
+		},
+		Want: want,
+	})
 }

apptest/vminsert.go

@@ -6,6 +6,7 @@ import (
 	"regexp"
 	"strings"
 	"testing"
+	"time"
 )
 
 // Vminsert holds the state of a vminsert app and provides vminsert-specific
@@ -55,10 +56,47 @@ func (app *Vminsert) PrometheusAPIV1ImportPrometheus(t *testing.T, records []str
 	t.Helper()
 
 	url := fmt.Sprintf("http://%s/insert/%s/prometheus/api/v1/import/prometheus", app.httpListenAddr, opts.Tenant)
+	wantRowsSentCount := app.rpcRowsSentTotal(t) + len(records)
 	app.cli.Post(t, url, "text/plain", strings.Join(records, "\n"), http.StatusNoContent)
+	app.waitUntilSent(t, wantRowsSentCount)
 }
 
 // String returns the string representation of the vminsert app state.
 func (app *Vminsert) String() string {
 	return fmt.Sprintf("{app: %s httpListenAddr: %q}", app.app, app.httpListenAddr)
 }
+
+// waitUntilSent waits until vminsert sends buffered data to vmstorage.
+//
+// Waiting is implemented a retrieving the value of `vm_rpc_rows_sent_total`
+// metric and checking whether it is equal or greater than the wanted value.
+// If it is, then the data has been sent to vmstorage.
+//
+// Unreliable if the records are inserted concurrently.
+func (app *Vminsert) waitUntilSent(t *testing.T, wantRowsSentCount int) {
+	t.Helper()
+
+	const (
+		retries = 20
+		period  = 100 * time.Millisecond
+	)
+
+	for range retries {
+		if app.rpcRowsSentTotal(t) >= wantRowsSentCount {
+			return
+		}
+		time.Sleep(period)
+	}
+	t.Fatalf("timed out while waiting for inserted rows to be sent to vmstorage")
+}
+
+// rpcRowsSentTotal retrieves the values of all vminsert
+// `vm_rpc_rows_sent_total` metrics (there will be one for each vmstorage) and
+// returns their integer sum.
+func (app *Vminsert) rpcRowsSentTotal(t *testing.T) int {
+	total := 0.0
+	for _, v := range app.GetMetricsByPrefix(t, "vm_rpc_rows_sent_total") {
+		total += v
+	}
+	return int(total)
+}