Add integration for SSD (read & write targets) (#6585)

* Add integration for SSD (read & write targets)

* Hardcode randStringRunes to fix linter

integration/loki_simple_scalable_test.go

@@ -0,0 +1,75 @@
+package integration
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/grafana/loki/integration/client"
+	"github.com/grafana/loki/integration/cluster"
+)
+
+func TestSimpleScalableIngestQuery(t *testing.T) {
+	clu := cluster.New()
+	defer func() {
+		assert.NoError(t, clu.Cleanup())
+	}()
+
+	var (
+		tRead = clu.AddComponent(
+			"read",
+			"-target=read",
+		)
+		tWrite = clu.AddComponent(
+			"write",
+			"-target=write",
+		)
+	)
+
+	require.NoError(t, clu.Run())
+
+	tenantID := randStringRunes()
+
+	now := time.Now()
+	cliWrite := client.New(tenantID, "", tWrite.HTTPURL().String())
+	cliWrite.Now = now
+	cliRead := client.New(tenantID, "", tRead.HTTPURL().String())
+	cliRead.Now = now
+
+	t.Run("ingest logs", func(t *testing.T) {
+		// ingest some log lines
+		require.NoError(t, cliWrite.PushLogLineWithTimestamp("lineA", now.Add(-45*time.Minute), map[string]string{"job": "fake"}))
+		require.NoError(t, cliWrite.PushLogLineWithTimestamp("lineB", now.Add(-45*time.Minute), map[string]string{"job": "fake"}))
+
+		require.NoError(t, cliWrite.PushLogLine("lineC", map[string]string{"job": "fake"}))
+		require.NoError(t, cliWrite.PushLogLine("lineD", map[string]string{"job": "fake"}))
+	})
+
+	t.Run("query", func(t *testing.T) {
+		resp, err := cliRead.RunRangeQuery(`{job="fake"}`)
+		require.NoError(t, err)
+		assert.Equal(t, "streams", resp.Data.ResultType)
+
+		var lines []string
+		for _, stream := range resp.Data.Stream {
+			for _, val := range stream.Values {
+				lines = append(lines, val[1])
+			}
+		}
+		assert.ElementsMatch(t, []string{"lineA", "lineB", "lineC", "lineD"}, lines)
+	})
+
+	t.Run("label-names", func(t *testing.T) {
+		resp, err := cliRead.LabelNames()
+		require.NoError(t, err)
+		assert.ElementsMatch(t, []string{"job"}, resp)
+	})
+
+	t.Run("label-values", func(t *testing.T) {
+		resp, err := cliRead.LabelValues("job")
+		require.NoError(t, err)
+		assert.ElementsMatch(t, []string{"fake"}, resp)
+	})
+}