Simple Math App

Simple web application in Go which accepts math problems via the URL and returns the response in JSON.

How to run it

Before proceeding to the next steps, make sure you have Go installed and GOPATH environment variable set.

Get the project

go get https://github.com/igorvarga/simplemath

Configure Server parameters (Optional step)

Server can be configured using environment variables listed below. In case that environment variables are missing the default values will be used.

Variable	Description
SM_ADDR	Server address string in addreess:port format, default value: ":8080"
SM_CACHE_EXPIRATION	Cache item expiry in seconds, default value: 60
SM_CACHE_SWEEPINTERVAL	Expired cache items sweep interval in seconds, default value 5

Windows example

SET SM_ADDR=":9090"
SET SM_CACHE_EXPIRATION=30
SET SM_CACHE_SWEEPINTERVAL=5

Linux example

Substitute SET with EXPORT keyword

Run

cd %GOPATH%\src\github.com\igorvarga\simplemath
go run main.go

Build

cd %GOPATH%\src\github.com\igorvarga\simplemath
go build .

Try it

curl "http://localhost:8080/add?x=2&y=7"

Running tests

cd %GOPATH%\src\github.com\igorvarga\simplemath
go test ./...

Deploying to cloud

Connect CircleCI for building and deploying steps to any cloud provider supported by CircleCI.

TODO

• Use .env for configuration
• Init project as go module
• Add docker (dev/docker branch)
• Add client cache HTTP headers
• Introduce context cancellation to all layers
• Add leaky bucket feature to cache, map memory limit
• Explore RWMutex
• Refactor server and cache structs and interfaces to be more specific about their functionality
• Explore sync.Map
• Benchmark, sync race and memory profiling tests
• Write better godoc and tests
• REST API versioning