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Monthly Downloads: 4
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags:
API
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README
ExchangeRates, a Haskell client for http://exchangeratesapi.io/
Automatic Transparent Caching
Because historical currency conversion rates do not change post-hoc, we can cache them indefinitely. Because of this, and because http://exchangeratesapi.io/ is a free service, we should cache the results of the API as much as possible. This client automatically transparenly caches results so that the real API is only called when absolutely necessary.
Example usage:
main :: IO
main = do
rates <-
autoRunExchangeRatesClient $
withFileCache "/tmp/exchangerates.cache" $
getAtDate (fromGregorian 2018 01 19) (Just EUR) Nothing
case rates of
Left err -> die $ show err
Right v -> print v
Rates
{ ratesBase = EUR
, ratesDate = 2018-01-19
, ratesRates = fromList
[ (AUD,Rate {unRate = 6891408149802333 % 4503599627370496})
, (BGN,Rate {unRate = 550508759450701 % 281474976710656})
, (BRL,Rate {unRate = 8852275427559447 % 2251799813685248})
, (CAD,Rate {unRate = 3433093995944529 % 2251799813685248})
, (CHF,Rate {unRate = 5295332441862229 % 4503599627370496})
, (CNY,Rate {unRate = 8836175058891597 % 1125899906842624})
, (CZK,Rate {unRate = 3579376541341057 % 140737488355328})
, (DKK,Rate {unRate = 8382775166406073 % 1125899906842624})
, (GBP,Rate {unRate = 3979605810725939 % 4503599627370496})
, (HKD,Rate {unRate = 5393848683710959 % 562949953421312})
, (HRK,Rate {unRate = 4185645493678139 % 562949953421312})
, (HUF,Rate {unRate = 5439503924933427 % 17592186044416})
, (IDR,Rate {unRate = 16316 % 1})
, (ILS,Rate {unRate = 2355213720128743 % 562949953421312})
, (INR,Rate {unRate = 2752790087858127 % 35184372088832})
, (JPY,Rate {unRate = 4768889792920289 % 35184372088832})
, (KRW,Rate {unRate = 2873903492680909 % 2199023255552})
, (MXN,Rate {unRate = 6422133068630327 % 281474976710656})
, (MYR,Rate {unRate = 5433592950422503 % 1125899906842624})
, (NOK,Rate {unRate = 5417999236712733 % 562949953421312})
, (NZD,Rate {unRate = 3790004266413641 % 2251799813685248})
, (PHP,Rate {unRate = 8745146051423371 % 140737488355328})
, (PLN,Rate {unRate = 2348402025692345 % 562949953421312})
, (RON,Rate {unRate = 2623009012971261 % 562949953421312})
, (RUB,Rate {unRate = 609850721415725 % 8796093022208})
, (SEK,Rate {unRate = 5535655776977787 % 562949953421312})
, (SGD,Rate {unRate = 1821480869289997 % 1125899906842624})
, (THB,Rate {unRate = 2749236466277155 % 70368744177664})
, (TRY,Rate {unRate = 5241852196287205 % 1125899906842624})
, (USD,Rate {unRate = 5519161343342543 % 4503599627370496})
, (ZAR,Rate {unRate = 8418916553415721 % 562949953421312})
]
}