Toll-Calculator

This project aims to enhance my understanding of microservices architecture in Go. The Toll-Calculator system is built using Go, gRPC, Kafka, Prometheus, gorilla/websocket, and sirupsen/logrus. This system is used to calculate toll tax for trucks by calculating amount of distance it travelled.

About

The Toll-Calculator is a microservices-based toll calculation system designed in Go. The system comprises multiple services, including:

• Aggregator: Combines data from various services.
• Data Receiver: Collects vehicle data from On-Board Units (OBUs).
• Distance Calculator: Computes travel distance.
• Gateway: Manages communication between services.

Key features:

• Implemented gRPC for inter-service communication.
• Used Kafka for message queuing.
• A mock-up OBU that sends random data to receiver.
• Integrated Prometheus for monitoring.
• Employed sirupsen/logrus for logging.
• Provides real-time toll calculation and billing for vehicles.
• Ensures scalable and fault-tolerant microservices architecture.

Installing Kafka

docker run --name kafka -p 9092:9092 -e ALLOW_PLAINTEXT_LISTENER=yes -e KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=true bitnami/kafka:latest 

Installing protobuf compiler (protoc compiler)

For linux users or (WSL2)

sudo apt install -y protobuf-compiler

For Mac users you can use Brew for this

brew install protobuff

Installing GRPC and Protobuffer plugins for Golang.

1. Protobuffers

go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.28

2. GRPC

go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2

3. NOTE that you need to set the /go/bin directory in your path Just like this or whatever your go directly lives.

PATH="${PATH}:${HOME}/go/bin"

4. install the package dependencies 4.1 protobuffer package

go get google.golang.org/protobuf

4.2 grpc package

go get google.golang.org/grpc/

Installing Prometheus

Install Prometheus in a Docker container

docker run -p 9090:9090 -v ./.config/prometheus.yml:/etc/prometheus/prometheus.yml prom/prometheus

Installing prometheus golang client

go get github.com/prometheus/client_golang/prometheus

Installing Prometheus natively on your system

1. Clone the repository

git clone https://github.com/promtheus/prometheus.git

2. Install

cd prometheus
make build

3. Run the Prometheus deamon

./promtheus --config.file=<your_config_file>yml

4. In the projects case that would be (running from inside the project directory)

../prometheus/prometheus --config.file=.config/prometheus.yml