Implement Coinhouse ticker (coingecko#295)

* implement coinhouse pairs

* implement coinhouse ticker

* add rspec on coinhouse

* add read me

* use regex to detect target currency

* Update readme for coinhouse mistake conflict resolve

README.md

@@ -67,6 +67,7 @@ Or install it yourself as:
 | Coinfalcon        | Y       | Y          | Y       |         | Y           |
 | CoinExchange      | Y       |            |         |         | Y           |
 | Coinbene          | Y       | Y          | Y       |         | Y           |
+| Coinhouse         | Y       |            |         |         | Y           |
 | Coinmate          | Y       | Y          |         |         | User-Defined|
 | Coinnest          | Y       | Y          | Y       |         | User-Defined|
 | Coinroom          | Y       |            |         |         | Y           |

lib/cryptoexchange/exchanges/coinhouse/market.rb

@@ -0,0 +1,8 @@
+module Cryptoexchange::Exchanges
+  module Coinhouse
+    class Market
+      NAME = 'coinhouse'
+      API_URL = 'https://coinhouse.eu/v2'
+    end
+  end
+end

lib/cryptoexchange/exchanges/coinhouse/services/market.rb

@@ -0,0 +1,52 @@
+module Cryptoexchange::Exchanges
+  module Coinhouse
+    module Services
+      class Market < Cryptoexchange::Services::Market
+        class << self
+          def supports_individual_ticker_query?
+            false
+          end
+        end
+
+        def fetch
+          output = super ticker_url
+          adapt_all(output)
+        end
+
+        def ticker_url
+          "#{Cryptoexchange::Exchanges::Coinhouse::Market::API_URL}/tickers"
+        end
+
+        def adapt_all(output)
+          output.map do |key, value|
+            separator = /(USDT|BTC|BCH|ETH)\z/i =~ key
+            base      = key[0..separator - 1]
+            target    = key[separator..-1]
+            market_pair = Cryptoexchange::Models::MarketPair.new(
+                base: base,
+                target: target,
+                market: Coinhouse::Market::NAME
+            )
+            adapt(value, market_pair)
+          end
+        end
+
+        def adapt(output, market_pair)
+          ticker = Cryptoexchange::Models::Ticker.new
+          ticker.base      = market_pair.base
+          ticker.target    = market_pair.target
+          ticker.market    = Coinhouse::Market::NAME
+          ticker.ask       = NumericHelper.to_d(output['sell'])
+          ticker.bid       = NumericHelper.to_d(output['buy'])
+          ticker.last      = NumericHelper.to_d(output['last'])
+          ticker.high      = NumericHelper.to_d(output['high'])
+          ticker.low       = NumericHelper.to_d(output['low'])
+          ticker.volume    = NumericHelper.to_d(output['quoteVolume'])
+          ticker.timestamp = Time.now.to_i
+          ticker.payload   = output
+          ticker
+        end
+      end
+    end
+  end
+end

lib/cryptoexchange/exchanges/coinhouse/services/pairs.rb

@@ -0,0 +1,37 @@
+module Cryptoexchange::Exchanges
+  module Coinhouse
+    module Services
+      class Pairs < Cryptoexchange::Services::Pairs
+        PAIRS_URL = "#{Cryptoexchange::Exchanges::Coinhouse::Market::API_URL}/tickers"
+        TARGET    = 'BTC'
+
+        def fetch
+          output = super
+          adapt(output)
+        end
+
+        def adapt(output)
+          market_pairs = []
+          output.each_key do |pair|
+            base, target = strip_pairs(pair)
+            next unless base && target
+            market_pairs << Cryptoexchange::Models::MarketPair.new(
+              base:   base,
+              target: target,
+              market: Coinhouse::Market::NAME
+            )
+          end
+          market_pairs
+        end
+
+        def strip_pairs(pair_symbol)
+          separator = /(USDT|BTC|BCH|ETH)\z/i =~ pair_symbol
+          base      = pair_symbol[0..separator - 1]
+          target    = pair_symbol[separator..-1]
+
+          [base, target]
+        end
+      end
+    end
+  end
+end