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34 lines
903 B
CoffeeScript
34 lines
903 B
CoffeeScript
9 years ago
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Promise = require "bluebird"
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bhttp = require "bhttp"
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lastRates = null
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lastRateCheck = 0
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expireTime = 5 * 60 * 1000 # 5 minutes
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module.exports = (cacheExpiration) ->
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Promise.try ->
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if Date.now() > lastRateCheck + expireTime
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# We need fresh API data, our cache has expired.
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Promise.try ->
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Promise.all [
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bhttp.get "http://api.fixer.io/latest", decodeJSON: true
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bhttp.get "https://blockchain.info/ticker", decodeJSON: true
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]
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.spread (fixerRates, blockchainRates) ->
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eurRates = fixerRates.body.rates
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eurRates.BTC = 1 / blockchainRates.body.EUR["15m"]
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return eurRates
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.then (rates) ->
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lastRates = rates
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lastRateCheck = Date.now()
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if cacheExpiration?
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expireTime = cacheExpiration * 1000
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return rates
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.catch (err) ->
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# API is down. FIXME: Allow for logging this error somehow.
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return lastRates
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else
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return lastRates
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