Add Kafka exporter and receiver configuration (#5703)

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## Which problem is this PR solving?
-  Resolves #4868 

## Description of the changes
- Add config files for replacement of jaeger-collector and
jaeger-ingester.
- Add the architecture for the integration tests for kafka. 
- Add e2e integration tests for Kafka. 

## How was this change tested?
- Manually ran the collector, ingester configs to check if the data is
being pushed and pulled the right way and verified the architecture.

## Checklist
- [x] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [x] I have signed all commits
- [x] I have added unit tests for the new functionality
- [x] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `yarn lint` and `yarn test`

---------

Signed-off-by: joeyyy09 <menteharshith@gmail.com>
Signed-off-by: Harshith Mente <109957201+joeyyy09@users.noreply.github.com>
Signed-off-by: Yuri Shkuro <github@ysh.us>
Co-authored-by: Yuri Shkuro <yurishkuro@users.noreply.github.com>
Co-authored-by: Yuri Shkuro <github@ysh.us>

cmd/jaeger/collector-with-kafka.yaml

@@ -0,0 +1,28 @@
+service:
+  pipelines:
+    traces:
+      receivers: [otlp, jaeger]
+      processors: [batch]
+      exporters: [kafka]
+
+receivers:
+  otlp:
+    protocols:
+      grpc:
+      http:
+  jaeger:
+    protocols:
+      grpc:
+      thrift_binary:
+      thrift_compact:
+      thrift_http:
+
+processors:
+  batch:
+
+exporters:
+  kafka:
+    brokers:
+      - localhost:9092
+    topic: "jaeger-spans"
+    encoding: otlp_proto

cmd/jaeger/ingester-remote-storage.yaml

@@ -0,0 +1,37 @@
+service:
+  extensions: [jaeger_storage, jaeger_query]
+  pipelines:
+    traces:
+      receivers: [kafka]
+      processors: [batch]
+      exporters: [jaeger_storage_exporter]
+  telemetry:
+    metrics:
+      address: 0.0.0.0:8889
+    logs:
+      level: debug
+
+extensions:
+  jaeger_query:
+    trace_storage: some_storage
+
+  jaeger_storage:
+    backends:
+      some_storage:
+        memory:
+          max_traces: 100000
+
+receivers:  
+  kafka:
+    brokers:
+      - localhost:9092
+    topic: "jaeger-spans"
+    encoding: otlp_proto
+    initial_offset: earliest
+
+processors:
+  batch:
+
+exporters:
+  jaeger_storage_exporter:
+    trace_storage: some_storage

cmd/jaeger/internal/integration/README.md

@@ -63,6 +63,56 @@ flowchart LR
     end
 ```
 
+## Kafka Integration
+
+The primary difference between the Kafka integration tests and other integration tests lies in the flow of data. In the standard tests, spans are written by the SpanWriter, sent through an RPC_client directly to a receiver, then to an exporter, and written to a storage backend. Spans are read by the SpanReader, which queries the jaeger_query process accessing the storage backend. In contrast, the Kafka tests introduce Kafka as an intermediary. Spans go from the SpanWriter through an RPC_client to an OTLP receiver in the Jaeger Collector, exported to Kafka, received by the Jaeger Ingester, and then stored. For details, see the [Architecture](#KafkaArchitecture) section below.
+
+
+## Kafka Architecture
+
+``` mermaid
+flowchart LR
+        Test -->|writeSpan| SpanWriter
+        SpanWriter --> RPCW[RPC_client]
+        RPCW --> OTLP_Receiver[Receiver]
+        OTLP_Receiver --> CollectorExporter[Kafka Exporter]
+        CollectorExporter --> Kafka[Kafka]
+        Kafka --> IngesterReceiver[Kafka Receiver]
+        IngesterReceiver --> IngesterExporter[Exporter]
+        IngesterExporter --> StorageBackend[(In-Memory Store)]
+        Test -->|readSpan| SpanReader
+        SpanReader --> RPCR[RPC_client]
+        RPCR --> QueryProcess[jaeger_query]
+        StorageCleaner -->|purge| StorageBackend
+        QueryProcess --> StorageBackend
+        
+
+        subgraph Integration_Test_Executable
+            Test
+            SpanWriter
+            SpanReader
+            RPCW
+            RPCR
+        end
+
+        subgraph Jaeger Collector
+            OTLP_Receiver
+            CollectorExporter
+        end
+
+        subgraph Jaeger Ingester
+            IngesterReceiver
+            IngesterExporter
+            QueryProcess
+            StorageBackend
+            StorageCleaner[Storage Cleaner Extension]
+        end
+
+        subgraph Kafka
+            Topic
+        end
+```
+
 ## Running tests locally
 
 All integration tests can be run locally.

cmd/jaeger/internal/integration/badger_test.go

@@ -24,8 +24,5 @@ func TestBadgerStorage(t *testing.T) {
 		},
 	}
 	s.e2eInitialize(t, "badger")
-	t.Cleanup(func() {
-		s.e2eCleanUp(t)
-	})
 	s.RunAll(t)
 }

cmd/jaeger/internal/integration/cassandra_test.go

@@ -22,8 +22,5 @@ func TestCassandraStorage(t *testing.T) {
 		},
 	}
 	s.e2eInitialize(t, "cassandra")
-	t.Cleanup(func() {
-		s.e2eCleanUp(t)
-	})
 	s.RunSpanStoreTests(t)
 }

cmd/jaeger/internal/integration/e2e_integration.go

@@ -37,6 +37,7 @@ const otlpPort = 4317
 //   - At last, clean up anything declared in its own test functions.
 //     (e.g. close remote-storage)
 type E2EStorageIntegration struct {
+	SkipStorageCleaner bool
 	integration.StorageIntegration
 	ConfigFile string
 }
@@ -46,7 +47,10 @@ type E2EStorageIntegration struct {
 // This function should be called before any of the tests start.
 func (s *E2EStorageIntegration) e2eInitialize(t *testing.T, storage string) {
 	logger := zaptest.NewLogger(t, zaptest.WrapOptions(zap.AddCaller()))
-	configFile := createStorageCleanerConfig(t, s.ConfigFile, storage)
+	configFile := s.ConfigFile
+	if !s.SkipStorageCleaner {
+		configFile = createStorageCleanerConfig(t, s.ConfigFile, storage)
+	}
 	t.Logf("Starting Jaeger-v2 in the background with config file %s", configFile)
 
 	outFile, err := os.OpenFile(
@@ -93,19 +97,27 @@ func (s *E2EStorageIntegration) e2eInitialize(t *testing.T, storage string) {
 	}, 30*time.Second, 500*time.Millisecond, "Jaeger-v2 did not start")
 	t.Log("Jaeger-v2 is ready")
 	t.Cleanup(func() {
-		require.NoError(t, cmd.Process.Kill())
+		if err := cmd.Process.Kill(); err != nil {
+			t.Errorf("Failed to kill Jaeger-v2 process: %v", err)
+		}
 		if t.Failed() {
 			// A Github Actions special annotation to create a foldable section
 			// in the Github runner output.
 			// https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#grouping-log-lines
 			fmt.Println("::group::🚧 🚧 🚧 Jaeger-v2 binary logs")
 			outLogs, err := os.ReadFile(outFile.Name())
-			require.NoError(t, err)
-			fmt.Printf("🚧 🚧 🚧 Jaeger-v2 output logs:\n%s", outLogs)
+			if err != nil {
+				t.Errorf("Failed to read output logs: %v", err)
+			} else {
+				fmt.Printf("🚧 🚧 🚧 Jaeger-v2 output logs:\n%s", outLogs)
+			}
 
 			errLogs, err := os.ReadFile(errFile.Name())
-			require.NoError(t, err)
-			fmt.Printf("🚧 🚧 🚧 Jaeger-v2 error logs:\n%s", errLogs)
+			if err != nil {
+				t.Errorf("Failed to read error logs: %v", err)
+			} else {
+				fmt.Printf("🚧 🚧 🚧 Jaeger-v2 error logs:\n%s", errLogs)
+			}
 			// End of Github Actions foldable section annotation.
 			fmt.Println("::endgroup::")
 		}
@@ -115,6 +127,11 @@ func (s *E2EStorageIntegration) e2eInitialize(t *testing.T, storage string) {
 	require.NoError(t, err)
 	s.SpanReader, err = createSpanReader(logger, ports.QueryGRPC)
 	require.NoError(t, err)
+
+	t.Cleanup(func() {
+		// Call e2eCleanUp to close the SpanReader and SpanWriter gRPC connection.
+		s.e2eCleanUp(t)
+	})
 }
 
 // e2eCleanUp closes the SpanReader and SpanWriter gRPC connection.

cmd/jaeger/internal/integration/elasticsearch_test.go

@@ -21,8 +21,5 @@ func TestElasticsearchStorage(t *testing.T) {
 		},
 	}
 	s.e2eInitialize(t, "elasticsearch")
-	t.Cleanup(func() {
-		s.e2eCleanUp(t)
-	})
 	s.RunSpanStoreTests(t)
 }

cmd/jaeger/internal/integration/grpc_test.go

@@ -36,7 +36,6 @@ func TestGRPCStorage(t *testing.T) {
 	s.initialize(t)
 	s.e2eInitialize(t, "grpc")
 	t.Cleanup(func() {
-		s.e2eCleanUp(t)
 		s.remoteStorage.Close(t)
 	})
 	s.RunSpanStoreTests(t)

cmd/jaeger/internal/integration/kafka_test.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2024 The Jaeger Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package integration
+
+import (
+	"testing"
+
+	"github.com/jaegertracing/jaeger/plugin/storage/integration"
+)
+
+func TestKafkaStorage(t *testing.T) {
+	integration.SkipUnlessEnv(t, "kafka")
+
+	collectorConfig := "../../collector-with-kafka.yaml"
+	ingesterConfig := "../../ingester-remote-storage.yaml"
+
+	collector := &E2EStorageIntegration{
+		SkipStorageCleaner: true,
+		ConfigFile:         collectorConfig,
+	}
+
+	// Initialize and start the collector
+	collector.e2eInitialize(t, "kafka")
+
+	ingester := &E2EStorageIntegration{
+		ConfigFile: ingesterConfig,
+		StorageIntegration: integration.StorageIntegration{
+			CleanUp:                      purge,
+			GetDependenciesReturnsSource: true,
+			SkipArchiveTest:              true,
+		},
+	}
+
+	// Initialize and start the ingester
+	ingester.e2eInitialize(t, "kafka")
+
+	// Run the span store tests
+	ingester.RunSpanStoreTests(t)
+}

cmd/jaeger/internal/integration/memory_test.go

@@ -20,8 +20,5 @@ func TestMemoryStorage(t *testing.T) {
 		},
 	}
 	s.e2eInitialize(t, "memory")
-	t.Cleanup(func() {
-		s.e2eCleanUp(t)
-	})
 	s.RunAll(t)
 }

cmd/jaeger/internal/integration/opensearch_test.go

@@ -20,8 +20,5 @@ func TestOpenSearchStorage(t *testing.T) {
 		},
 	}
 	s.e2eInitialize(t, "opensearch")
-	t.Cleanup(func() {
-		s.e2eCleanUp(t)
-	})
 	s.RunSpanStoreTests(t)
 }

plugin/storage/integration/integration.go

@@ -49,7 +49,7 @@ var fixtures embed.FS
 // - in those functions it instantiates and populates this struct
 // - it then calls RunAll.
 //
-// Some implementations may declate multuple tests, with different settings,
+// Some implementations may declare multiple tests, with different settings,
 // and RunAll() under different conditions.
 type StorageIntegration struct {
 	SpanWriter        spanstore.Writer