Implement message queue

.env

@@ -80,4 +80,9 @@ GRAFANA_SERVICE_HOST=grafana
 JAEGER_SERVICE_PORT=16686
 JAEGER_SERVICE_HOST=jaeger
 
+# Kafka
+KAFKA_SERVICE_PORT=9092
+KAFKA_SERVICE_ADDR=broker:${KAFKA_SERVICE_PORT}
+ZOOKEEPER_SERVICE_PORT=2181
+
 ENV_PLATFORM=local

docker-compose.yml

@@ -26,6 +26,31 @@ networks:
 
 services:
   # Ad service
+  accountingservice:
+    image: ${IMAGE_NAME}:${IMAGE_VERSION}-accountingservice
+    container_name: accounting-service
+    build:
+      context: ./
+      dockerfile: ./src/accountingservice/Dockerfile
+      cache_from:
+        - ${IMAGE_NAME}:${IMAGE_VERSION}-accountingservice
+    deploy:
+      resources:
+        limits:
+          memory: 300M
+    restart: always
+    environment:
+      - KAFKA_SERVICE_ADDR
+      - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
+      - OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
+      - OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE
+      - OTEL_SERVICE_NAME=accountingservice
+    depends_on:
+      - otelcol
+      - broker
+    logging: *logging
+
+  # AdService
   adservice:
     image: ${IMAGE_NAME}:${IMAGE_VERSION}-adservice
     container_name: ad-service
@@ -102,6 +127,7 @@ services:
       - PAYMENT_SERVICE_ADDR
       - PRODUCT_CATALOG_SERVICE_ADDR
       - SHIPPING_SERVICE_ADDR
+      - KAFKA_SERVICE_ADDR
       - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
       - OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
       - OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE
@@ -114,6 +140,7 @@ services:
       - productcatalogservice
       - shippingservice
       - otelcol
+      - broker
     logging: *logging
 
   # Currency service
@@ -166,6 +193,30 @@ services:
       - otelcol
     logging: *logging
 
+  frauddetection:
+    image: ${IMAGE_NAME}:${IMAGE_VERSION}-frauddetectionservice
+    container_name: frauddetection-service
+    build:
+      context: ./
+      dockerfile: ./src/frauddetectionservice/Dockerfile
+      cache_from:
+        - ${IMAGE_NAME}:${IMAGE_VERSION}-frauddetectionservice
+    deploy:
+      resources:
+        limits:
+          memory: 200M
+    restart: always
+    environment:
+      - KAFKA_SERVICE_ADDR
+      - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
+      - OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
+      - OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE
+      - OTEL_SERVICE_NAME=frauddetectionservice
+    depends_on:
+      - otelcol
+      - broker
+    logging: *logging
+
   # Frontend
   frontend:
     image: ${IMAGE_NAME}:${IMAGE_VERSION}-frontend
@@ -534,6 +585,34 @@ services:
       - "${REDIS_PORT}"
     logging: *logging
 
+  # Kafka
+  zookeeper:
+    image: confluentinc/cp-zookeeper:7.2.2
+    container_name: zookeeper
+    environment:
+      ZOOKEEPER_CLIENT_PORT: ${ZOOKEEPER_SERVICE_PORT}
+      ZOOKEEPER_TICK_TIME: 2000
+
+  broker:
+    image: confluentinc/cp-kafka:7.2.2
+    container_name: broker
+    depends_on:
+      - zookeeper
+    ports:
+      # To learn about configuring Kafka for access across networks see
+      # https://www.confluent.io/blog/kafka-client-cannot-connect-to-broker-on-aws-on-docker-etc/
+      - "9092:9092"
+    environment:
+      KAFKA_BROKER_ID: 1
+      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:${ZOOKEEPER_SERVICE_PORT}'
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_INTERNAL:PLAINTEXT
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://:${KAFKA_SERVICE_PORT},PLAINTEXT_INTERNAL://:29092
+      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
+      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
+      KAFKA_AUTO_CREATE_TOPICS_ENABLE: true
+
+      KAFKA_LOG4J_ROOT_LOGLEVEL: DEBUG
 
   # Frontend Tests
   frontendTests:

docs/README.md

@@ -24,18 +24,19 @@ Want to deploy the demo and see it in action? Start here.
 Want to understand how a particular language's instrumentation works? Start
 here.
 
-| Language      | Auto Instrumentation                                                                                                | Manual Instrumentation                                                                                              |
-|---------------|---------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------|
-| .NET          | [Cart Service](./services/cartservice.md)                                                                           | [Cart Service](./services/cartservice.md)                                                                           |
-| C++           |                                                                                                                     |                                                                                                                     |
-| Erlang/Elixir | [Feature Flag Service](./services/featureflagservice.md)                                                            | [Feature Flag Service](./services/featureflagservice.md)                                                            |
-| Go            | [Checkout Service](./services/checkoutservice.md), [Product Catalog Service]( ./services/productcatalogservice.md ) | [Checkout Service](./services/checkoutservice.md), [Product Catalog Service]( ./services/productcatalogservice.md ) |
-| Java          | [Ad Service](./services/adservice.md)                                                                               | [Ad Service](./services/adservice.md)                                                                               |
-| JavaScript    | [Frontend]( ./services/frontend.md )                                                                                | [Frontend](./services/frontend.md), [Payment Service](./services/paymentservice.md)                                 |
-| PHP           | [Quote Service](./services/quoteservice.md)                                                                         | [Quote Service](./services/quoteservice.md)                                                                         |
-| Python        | [Recommendation Service](./services/recommendationservice.md)                                                       | [Recommendation Service](./services/recommendationservice.md)                                                       |
-| Ruby          | [Email Service](./services/emailservice.md)                                                                         | [Email Service](./services/emailservice.md)                                                                         |
-| Rust          | [Shipping Service](./services/shippingservice.md)                                                                   | [Shipping Service](./services/shippingservice.md)                                                                   |
+| Language      | Auto Instrumentation                                                                                                                                                       | Manual Instrumentation                                                                                              |
+|---------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------|
+| .NET          | [Cart Service](./services/cartservice.md)                                                                                                                                  | [Cart Service](./services/cartservice.md)                                                                           |
+| C++           |                                                                                                                                                                            |                                                                                                                     |
+| Erlang/Elixir | [Feature Flag Service](./services/featureflagservice.md)                                                                                                                   | [Feature Flag Service](./services/featureflagservice.md)                                                            |
+| Go            | [Accounting Service](./services/accountingservice.md), [Checkout Service](./services/checkoutservice.md), [Product Catalog Service]( ./services/productcatalogservice.md ) | [Checkout Service](./services/checkoutservice.md), [Product Catalog Service]( ./services/productcatalogservice.md ) |
+| Java          | [Ad Service](./services/adservice.md)                                                                                                                                      | [Ad Service](./services/adservice.md)                                                                               |
+| JavaScript    | [Frontend]( ./services/frontend.md )                                                                                                                                       | [Frontend](./services/frontend.md), [Payment Service](./services/paymentservice.md)                                 |
+| Kotlin        | [Fraud Detection Service]( ./services/frauddetectionservice.md )                                                                                                           |                                                                                                                     |
+| PHP           | [Quote Service](./services/quoteservice.md)                                                                                                                                | [Quote Service](./services/quoteservice.md)                                                                         |
+| Python        | [Recommendation Service](./services/recommendationservice.md)                                                                                                              | [Recommendation Service](./services/recommendationservice.md)                                                       |
+| Ruby          | [Email Service](./services/emailservice.md)                                                                                                                                | [Email Service](./services/emailservice.md)                                                                         |
+| Rust          | [Shipping Service](./services/shippingservice.md)                                                                                                                          | [Shipping Service](./services/shippingservice.md)                                                                   |
 
 ### Service Documentation
 

docs/docker_deployment.md

@@ -4,7 +4,7 @@
 
 - Docker
 - [Docker Compose](https://docs.docker.com/compose/install/#install-compose) v2.0.0+
-- 4 GB of RAM
+- 5 GB of RAM
 
 ## Clone Repo
 

docs/service_table.md

@@ -4,11 +4,13 @@ View [Service Graph](./current_architecture.md) to visualize request flows.
 
 | Service                                                      | Language      | Description                                                                                                                                  |
 |--------------------------------------------------------------|---------------|----------------------------------------------------------------------------------------------------------------------------------------------|
+| [accountingservice](./services/accountingservice.md)         | Go            | Processes incoming orders and count the sum of all orders (mock).                                                                            |
 | [adservice](./services/adservice.md)                         | Java          | Provides text ads based on given context words.                                                                                              |
 | [cartservice](./services/cartservice.md)                     | DotNet        | Stores the items in the user's shopping cart in Redis and retrieves it.                                                                      |
 | [checkoutservice](./services/checkoutservice.md)             | Go            | Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification.                                       |
 | [currencyservice](./services/currencyservice.md)             | C++           | Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service.            |
 | [emailservice](./services/emailservice.md)                   | Ruby          | Sends users an order confirmation email (mock).                                                                                              |
+| [frauddetectionservice](./services/frauddetectionservice.md) | Kotlin        | Analyzes incoming orders and detects fraud attempts (mock).                                                                                  |
 | [featureflagservice](./services/featureflagservice.md)       | Erlang/Elixir | CRUD feature flag service to demonstrate various scenarios like fault injection & how to emit telemetry from a feature flag reliant service. |
 | [frontend](./services/frontend.md)                           | JavaScript    | Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically.            |
 | [loadgenerator](./services/loadgenerator.md)                 | Python/Locust | Continuously sends requests imitating realistic user shopping flows to the frontend.                                                         |

docs/services/accountingservice.md

@@ -0,0 +1,56 @@
+# Accounting Service
+
+This service calculates the total amount of sold products. 
+This is only mocked and received orders are printed out.
+
+[Accounting Service](../../src/accountingservice/)
+
+## Traces
+
+### Initializing Tracing
+
+The OpenTelemetry SDK is initialized from `main` using the `initTracerProvider`
+function.
+
+```go
+func initTracerProvider() (*sdktrace.TracerProvider, error) {
+	ctx := context.Background()
+
+	exporter, err := otlptracegrpc.New(ctx)
+	if err != nil {
+		return nil, err
+	}
+	tp := sdktrace.NewTracerProvider(
+		sdktrace.WithBatcher(exporter),
+	)
+	otel.SetTracerProvider(tp)
+	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+	return tp, nil
+}
+```
+
+You should call `TracerProvider.Shutdown()` when your service is shutdown to
+ensure all spans are exported. This service makes that call as part of a
+deferred function in main
+
+```go
+	tp, err := initTracerProvider()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer func() {
+		if err := tp.Shutdown(context.Background()); err != nil {
+			log.Printf("Error shutting down tracer provider: %v", err)
+		}
+	}()
+```
+
+### Adding Kafka ( Sarama ) auto-instrumentation
+
+This service will receive the processed results of the Checkout Service via a Kafka topic.
+To instrument the Kafka client the ConsumerHandler implemented by the developer has to be wrapped.
+
+```go
+	handler := groupHandler{} // implements sarama.ConsumerGroupHandler
+    wrappedHandler := otelsarama.WrapConsumerGroupHandler(&handler)
+```

docs/services/checkoutservice.md

@@ -67,6 +67,21 @@ func createClient(ctx context.Context, svcAddr string) (*grpc.ClientConn, error)
 }
 ```
 
+### Adding Kafka ( Sarama ) auto-instrumentation
+
+This service will write the processed results onto a Kafka topic which will then be in turn be processed by other 
+microservices. 
+To instrument the Kafka client the Producer has to be wrapped after it has been created. 
+
+```go
+	saramaConfig := sarama.NewConfig()
+	producer, err := sarama.NewAsyncProducer(brokers, saramaConfig)
+	if err != nil {
+		return nil, err
+	}
+	producer = otelsarama.WrapAsyncProducer(saramaConfig, producer)
+```
+
 ### Add attributes to auto-instrumented spans
 
 Within the execution of auto-instrumented code you can get current span from

docs/services/frauddetectionservice.md

@@ -0,0 +1,16 @@
+# Fraud Detection Service
+
+This services analyses incoming orders and detects malicious customers.
+This is only mocked and received orders are printed out.
+
+## Auto-instrumentation
+
+This service relies on the OpenTelemetry Java Agent to automatically instrument
+libraries such as Kafka, and to configure the OpenTelemetry SDK. The agent is
+passed into the process using the `-javaagent` command line argument. Command
+line arguments are added through the `JAVA_TOOL_OPTIONS` in the `Dockerfile`,
+and leveraged during the automatically generated Gradle startup script.
+
+```dockerfile
+ENV JAVA_TOOL_OPTIONS=-javaagent:/app/opentelemetry-javaagent.jar
+```

src/accountingservice/Dockerfile

@@ -0,0 +1,38 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM golang:1.19.2-alpine AS builder
+RUN apk add build-base protoc
+WORKDIR /usr/src/app/
+
+# Restore dependencies
+COPY ./src/accountingservice/ ./
+COPY ./pb/ ./proto/
+RUN go mod download
+RUN go install google.golang.org/protobuf/cmd/[email protected]
+RUN go install google.golang.org/grpc/cmd/[email protected]
+
+# Build executable
+RUN protoc -I ./proto/ ./proto/demo.proto --go_out=./ --go-grpc_out=./
+RUN go build -o /go/bin/accountingservice/ ./
+
+# -----------------------------------------------------------------------------
+
+FROM alpine
+
+WORKDIR /usr/src/app/
+
+COPY --from=builder /go/bin/accountingservice/ ./
+
+ENTRYPOINT [ "./accountingservice" ]

src/accountingservice/README.md

@@ -0,0 +1,2 @@
+# accountingservice
+