RPC-INCREMENTOR-SERVICE

Test task

Description

The task involved developing an RPC service in the Go programming language. This service needed to fulfill two main functions: returning a numerical value and incrementing this value through a designated method call. Dynamic parameters, including the increment step and an upper threshold, were configurable during the service's runtime. It was imperative that the service retained both the numeric value and the configuration settings within a repository, ensuring that these values could be seamlessly restored following any service restarts.

Available gRPC methods:

• GetNumber - returns current value
• IncrementNumber - increments current value
• SetSettings - set current upper limit and increment step

Used packages

• google.golang.org/grpc - gRPC & Protobuf package
• github.com/lib/pq - PostgreSQL driver
• github.com/jessevdk/go-flags - Package to parse commandline args (used in client app)
• go.uber.org/zap - Logger package
• github.com/golang-migrate/migrate/v4 - Creation of DB scheme and addition of initial data
• github.com/stretchr/testify - Unit testing utils

Dependencies

• docker
• make

Commands

• Generate go files based on proto files:

  make proto

• Run unit tests:

  make test

• Run server in debug mode (with in-memory storage):

  make debug

• Run End-to-End test:

  make e2e

• Run server (build docker images and run them in background):

  make up

• Stop server:

  make stop

TODO

• create domain entities at startup only and don't execute db queries for every rpc request
• increase tests coverage
• add mocks for tests