krupyansky / crypto-service

Go Lang developer test

Create a microservice that collect data from a cryptocompare using its API for example (https://min-api.cryptocompare.com/data/pricemultifull?fsyms=BTC&tsyms=USD,EUR)

For instance:

"fsyms" => ["BTC", "XRP", "ETH", "BCH", "EOS", "LTC", "XMR", "DASH"],

"tsyms" => ["USD", "EUR", "GBP", "JPY", "RUR"],

Struct of response currency

{

CHANGE24HOUR string

CHANGEPCT24HOUR string

OPEN24HOUR string

VOLUME24HOUR string

VOLUME24HOURTO string

LOW24HOUR string

HIGH24HOUR string

PRICE string

SUPPLY string

MKTCAP string

}

Currency pairs should be configurable.

Mysql parameters should be configurable.

Service must store data to mysql by sheduler (rawjson is ok).

Service must work in background.

If cryptocompare is non accessible service must return data from database via own API.

Data in response must be fresh (realtime). 2-3 minutes discrepancy is ok.

Using websockets is a plus. Clean architecture is a plus. Service scalability is a plus.

APPENDIX:

Example of HTTP request:

GET service/price?fsyms=BTC&tsyms=USD

Example of response:

{

"RAW": {

"BTC": {

"USD": {

"CHANGE24HOUR": -13.25,

"CHANGEPCT24HOUR": -0.18152873223073468,

"OPEN24HOUR": 7299.12,

"VOLUME24HOUR": 47600.120073200706,

"VOLUME24HOURTO": 348033250.4911315,

"LOW24HOUR": 7197.22,

"HIGH24HOUR": 7426.64,

"PRICE": 7285.87,

"LASTUPDATE": 1586433196,

"SUPPLY": 18313937,

"MKTCAP": 133432964170.19

}

}

},

"DISPLAY": {

"BTC": {

"USD": {

"CHANGE24HOUR": "$ -13.25",

"CHANGEPCT24HOUR": "-0.18",

"OPEN24HOUR": "$ 7,299.12",

"VOLUME24HOUR": "Ƀ 47,600.1",

"VOLUME24HOURTO": "$ 348,033,250.5",

"HIGH24HOUR": "$ 7,426.64",

"PRICE": "$ 7,285.87",

"FROMSYMBOL": "Ƀ",

"TOSYMBOL": "$",

"LASTUPDATE": "Just now",

"SUPPLY": "Ƀ 18,313,937.0",

"MKTCAP": "$ 133.43 B"

}

}

}

}

Example of WS request:

WS service/price

{ "fsyms": "DASH", "tsyms": "RUR" }