Initial commit

app/api/v2/coin_gecko/orderbook.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module API
+  module V2
+    module CoinGecko
+      class Orderbook < Grape::API
+        class OrderBook < Struct.new(:market, :asks, :bids); end
+
+        desc 'Get depth or specified market'
+        params do
+          requires :ticker_id,
+                   type: String,
+                   desc: 'A pair such as "LTC_BTC"',
+                   coerce_with: ->(name) { name.strip.split('_').join.downcase }
+          optional :depth,
+                   type: { value: Integer, message: 'coingecko.market_depth.non_integer_depth' },
+                   values: { value: 0..1000, message: 'coingecko.market_depth.invalid_depth' },
+                   desc: 'Orders depth quantity: [0, 100, 200, 500...]'
+        end
+
+        get '/orderbook' do
+          market = ::Market.find(params[:ticker_id])
+          asks = OrderAsk.get_depth(market.id)
+          bids = OrderBid.get_depth(market.id)
+
+          # Depth = 100 means 50 for each bid/ask side
+          # Not defined or 0 = full order book
+          unless params[:depth].to_d.zero?
+            asks = asks[0, params[:depth]/2]
+            bids = bids[0, params[:depth]/2]
+          end
+
+          orderbook = OrderBook.new market, asks, bids
+          present orderbook, with: API::V2::CoinGecko::Entities::Orderbook
+        end
+      end
+    end
+  end
+end