gvolpe / Exchange Rates
Licence: apache-2.0
💱 Querying a rate-limited currency exchange API using Redis as a cache
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exchange-rates
Querying a rate-limited foreign currency exchange API using Redis as a cache.
- Number of Requests per Hour: 100 (See config file)
Http Endpoints
GET /v1/currencies
Returns a list of the available currencies. Eg:
["USD","EUR","GBP","AUD","CAD","PLN","ARS"]
GET /v1/rates?from=EUR&to=USD
Returns the current exchange rate, if available:
{"to":"USD","from":"EUR","rate":1.139556}
Run it locally
You'll need a Redis instance. The easiest way to get started is by using docker:
docker run -it --rm -p 6379:6379 redis:5.0.0
And then run the web server app using cabal new-run exchange-rates, or using Nix nix-shell --pure shell.nix and cabal new-run exchange-rates. You should see something like:
AppConfig {forex = ForexConfig {host = "https://free.currconv.com/api/v7", apiKey = [SECRET], keyExpiration = 1800}, redis = RedisConfig {redisHost = "127.0.0.1", redisPort = 6379}}
Started server on localhost:8080
Calling web service for: USD -> GBP
Calling web service for: USD -> EUR
Cache hit: USD -> GBP
Calling web service for: USD -> PLN
Cache hit: USD -> PLN
Exchange rates are cached to avoid hitting the (limited) external service many times.
Browse the documentation
The docs are generated at compile time from the API definition. The API serves a swagger.json response that you can visualize in the Swagger UI:
docker run -p 80:8080 swaggerapi/swagger-ui
Go to localhost and enter http://localhost:8080/swagger.json.
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