Juno Inc., Test Task: In-memory cache

Task definition taken from here

Simple implementation of Redis-like in-memory cache

Desired features:

• Key-value storage with string, lists, dict support
• Per-key TTL
• Operations:
  • Get
  • Set
  • Remove
• Golang API client
• Provide some tests, API spec, some deployment manual, some examples of client usages would be nice.

Optional features:

• Telnet-like/HTTP-like API protocol
• performance tests
• Operations:
  • Keys

Build instructions

Build for definite OS and architecture on Linux

env GOOS=linux GOARCH=amd64 go build -o ./out/linux-amd64/web-cache ./web_server.go  
env GOOS=windows GOARCH=amd64 go build -o ./out/windows-amd64/web-cache.exe ./web_server.go

Build for definite OS and architecture on Windows

set GOOS=linux  
set GOARCH=amd64  
go build -o ./out/linux-amd64/web-cache ./web_server.go

set GOOS=windows  
set GOARCH=amd64  
go build -o ./out/windows-amd64/web-cache.exe ./web_server.go

Build using Gradle

./gradlew goBuild

Result binaries will be placed into

Put cache application into Docker image:

docker build -t apunko/go-cache .

Usage description

Start cache application using default port 8000:

go run ./web_server.go

Start cache application using user defined port:

go run ./web_server.go 8005

Start Docker image:

docker run --rm -p 8000:8000 apunko/go-cache

Or using docker-compose:

docker-compose up

Cache population with some key-value pairs:

curl -i -H "Accept: application/json" -H "Content-Type: application/json" -d '{"value": "Ivan", "ttl": 60000000000}' -X POST http://localhost:8000/items/name

curl -i -H "Accept: application/json" -H "Content-Type: application/json" -d '{"value": ["VISA", "Mastercard"], "ttl": 60000000000}' -X POST http://localhost:8000/items/cards

curl -i -H "Accept: application/json" -H "Content-Type: application/json" -d '{"value": {"Math": "9", "English": "7"}, "ttl": 60000000000}' -X POST http://localhost:8000/items/marks

Getting value by key=name from cache:

curl -i http://localhost:8000/items/name

Getting all keys from cache:

curl -i http://localhost:8000/items/keys

Deletion of some key-value pair from cache for key=name:

curl -i -X DELETE http://localhost:8000/items/name

Cache cleanup:

curl -i -X DELETE http://localhost:8000/items/keys