[exporter/elasticsearch] Add reliability tests (#31848)

**Description:** Adds integration tests for the elasticsearch exporter.

**Link to tracking Issue:** N/A

**Testing:** N/A

**Documentation:** N/A

I have not added a changelog because the contributing guidelines
indicated that we might not require any for the changes in this PR.

exporter/elasticsearchexporter/integrationtest/.gitignore

@@ -0,0 +1 @@
+results/*

exporter/elasticsearchexporter/integrationtest/Makefile

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+include ../../../Makefile.Common

exporter/elasticsearchexporter/integrationtest/collector.go

@@ -0,0 +1,281 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package integrationtest // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/elasticsearchexporter/integrationtest"
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/shirou/gopsutil/v3/process"
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/confmap"
+	"go.opentelemetry.io/collector/confmap/provider/fileprovider"
+	"go.opentelemetry.io/collector/exporter"
+	"go.opentelemetry.io/collector/exporter/debugexporter"
+	"go.opentelemetry.io/collector/extension"
+	"go.opentelemetry.io/collector/otelcol"
+	"go.opentelemetry.io/collector/processor"
+	"go.opentelemetry.io/collector/receiver"
+	"go.opentelemetry.io/collector/receiver/otlpreceiver"
+	"golang.org/x/sync/errgroup"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/elasticsearchexporter"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/extension/storage/filestorage"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/common/testutil"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/testbed/testbed"
+)
+
+// createConfigYaml creates a yaml config for an otel collector for testing.
+func createConfigYaml(
+	t testing.TB,
+	sender testbed.DataSender,
+	receiver testbed.DataReceiver,
+	processors map[string]string,
+	extensions map[string]string,
+	pipelineType string,
+	debug bool,
+) string {
+	t.Helper()
+
+	processorSection, processorList := createConfigSection(processors)
+	extensionSection, extensionList := createConfigSection(extensions)
+	debugVerbosity := "basic"
+	if debug {
+		debugVerbosity = "detailed"
+	}
+
+	format := `
+receivers:%v
+exporters:%v
+  debug:
+    verbosity: %s
+
+processors:
+  %s
+
+extensions:
+  %s
+
+service:
+  telemetry:
+    metrics:
+      address: 127.0.0.1:%d
+  extensions: [%s]
+  pipelines:
+    %s:
+      receivers: [%v]
+      processors: [%s]
+      exporters: [%v]
+`
+
+	return fmt.Sprintf(
+		format,
+		sender.GenConfigYAMLStr(),
+		receiver.GenConfigYAMLStr(),
+		debugVerbosity,
+		processorSection,
+		extensionSection,
+		testutil.GetAvailablePort(t),
+		extensionList,
+		pipelineType,
+		sender.ProtocolName(),
+		processorList,
+		receiver.ProtocolName(),
+	)
+}
+
+func createConfigSection(m map[string]string) (sections, list string) {
+	if len(m) > 0 {
+		first := true
+		for name, cfg := range m {
+			sections += cfg + "\n"
+			if !first {
+				list += ","
+			}
+			list += name
+			first = false
+		}
+	}
+	return
+}
+
+// recreatableOtelCol creates an otel collector that can be used to simulate
+// a crash of the collector. It implements the testbed.OtelColRunner interface.
+type recreatableOtelCol struct {
+	tempDir   string
+	factories otelcol.Factories
+	settings  otelcol.CollectorSettings
+	configStr string
+	errGrp    errgroup.Group
+	cancel    context.CancelFunc
+
+	mu  sync.Mutex
+	col *otelcol.Collector
+}
+
+func newRecreatableOtelCol(t testing.TB) *recreatableOtelCol {
+	var (
+		err       error
+		factories otelcol.Factories
+	)
+	factories.Receivers, err = receiver.MakeFactoryMap(
+		otlpreceiver.NewFactory(),
+	)
+	require.NoError(t, err)
+	factories.Extensions, err = extension.MakeFactoryMap(
+		filestorage.NewFactory(),
+	)
+	require.NoError(t, err)
+	factories.Processors, err = processor.MakeFactoryMap()
+	require.NoError(t, err)
+	factories.Exporters, err = exporter.MakeFactoryMap(
+		elasticsearchexporter.NewFactory(),
+		debugexporter.NewFactory(),
+	)
+	require.NoError(t, err)
+	return &recreatableOtelCol{
+		tempDir:   t.TempDir(),
+		factories: factories,
+	}
+}
+
+func (c *recreatableOtelCol) PrepareConfig(configStr string) (func(), error) {
+	configCleanup := func() {
+		// NoOp
+	}
+	c.configStr = configStr
+	return configCleanup, nil
+}
+
+func (c *recreatableOtelCol) Start(_ testbed.StartParams) error {
+	var err error
+
+	confFile, err := os.CreateTemp(c.tempDir, "conf-")
+	if err != nil {
+		return err
+	}
+
+	if _, err = confFile.Write([]byte(c.configStr)); err != nil {
+		os.Remove(confFile.Name())
+		return err
+	}
+
+	fmp := fileprovider.NewWithSettings(confmap.ProviderSettings{})
+	cfgProviderSettings := otelcol.ConfigProviderSettings{
+		ResolverSettings: confmap.ResolverSettings{
+			URIs:      []string{confFile.Name()},
+			Providers: map[string]confmap.Provider{fmp.Scheme(): fmp},
+		},
+	}
+
+	c.settings = otelcol.CollectorSettings{
+		BuildInfo:              component.NewDefaultBuildInfo(),
+		Factories:              func() (otelcol.Factories, error) { return c.factories, nil },
+		ConfigProviderSettings: cfgProviderSettings,
+		SkipSettingGRPCLogger:  true,
+	}
+
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	c.col, err = otelcol.NewCollector(c.settings)
+	if err != nil {
+		return err
+	}
+
+	return c.run()
+}
+
+func (c *recreatableOtelCol) Stop() (bool, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if c.col != nil {
+		c.col.Shutdown()
+		c.col = nil
+	}
+
+	if err := c.errGrp.Wait(); err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
+func (c *recreatableOtelCol) Restart(graceful bool, shutdownFor time.Duration) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if c.col == nil {
+		return nil
+	}
+
+	c.col.Shutdown()
+	if !graceful {
+		c.cancel()
+	}
+	err := c.errGrp.Wait()
+	if err != nil {
+		return fmt.Errorf("failed to stop old collector: %w", err)
+	}
+
+	c.col, err = otelcol.NewCollector(c.settings)
+	if err != nil {
+		return fmt.Errorf("failed to create new collector: %w", err)
+	}
+
+	time.Sleep(shutdownFor)
+	return c.run()
+}
+
+func (c *recreatableOtelCol) WatchResourceConsumption() error {
+	return nil
+}
+
+func (c *recreatableOtelCol) GetProcessMon() *process.Process {
+	return nil
+}
+
+func (c *recreatableOtelCol) GetTotalConsumption() *testbed.ResourceConsumption {
+	return &testbed.ResourceConsumption{
+		CPUPercentAvg: 0,
+		CPUPercentMax: 0,
+		RAMMiBAvg:     0,
+		RAMMiBMax:     0,
+	}
+}
+
+func (c *recreatableOtelCol) GetResourceConsumption() string {
+	return ""
+}
+
+func (c *recreatableOtelCol) run() error {
+	var ctx context.Context
+	ctx, c.cancel = context.WithCancel(context.Background())
+
+	col := c.col
+	c.errGrp.Go(func() error {
+		// Ignore context canceled errors
+		if err := col.Run(ctx); !errors.Is(err, context.Canceled) {
+			return err
+		}
+		return nil
+	})
+
+	for {
+		switch state := col.GetState(); state {
+		case otelcol.StateStarting:
+			time.Sleep(time.Second)
+		case otelcol.StateRunning:
+			return nil
+		default:
+			return fmt.Errorf("unable to start, otelcol state is %d", state)
+		}
+	}
+}

exporter/elasticsearchexporter/integrationtest/config.go

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+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package integrationtest // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/elasticsearchexporter/integrationtest"
+
+import (
+	"os"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func getDebugFlag(t testing.TB) bool {
+	raw := os.Getenv("DEBUG")
+	if raw == "" {
+		return false
+	}
+	debug, err := strconv.ParseBool(raw)
+	require.NoError(t, err, "debug flag parsing failed")
+	return debug
+}