Toll Calculator

This project entails a data processing pipeline where a Truck sends OBU (On Board Unit) data to a receiver service, which subsequently forwards the data to an Apache Kafka queue. A distance calculation service then retrieves data from Kafka to compute the distance traveled. This calculated distance is utilized by an invoicer service, which in turn invokes the invoice calculation service to compute charges based on the distance provided. Finally, the invoice service stores the data into a database.

Note

I didnt write too much code documentation so if you are curious, just read the test cases if you re wondering how the existing functionality works

How it works

Installing tools

Protobuffers & GRPC

go install google.golang.org/protobuf/cmd/protoc-gen-go@latest google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest

That you need to set the $GOPATH/bin directory in your path Just like this or whatever your go directly lives.

And dont forget to install protobuf compiler

install grafana

See Here

install the package dependencies

protobuffer package & GRPC package

google.golang.org/protobuf google.golang.org/grpc/

Setting the Environment

AGG_HTTP_ENDPOINT=:4000
AGG_GRPC_ENDPOINT=:3001
AGG_STORE_TYPE=memory

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

Clone the repository

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

Install

cd prometheus
make build

Run the Prometheus deamon

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

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

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

Kafka

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

pwnholic / toll_calculator