Initial commit

lib/peatio/bitcoin/client.rb

@@ -0,0 +1,49 @@
+module Bitcoin
+  class Client
+    Error = Class.new(StandardError)
+
+    class ConnectionError < Error; end
+
+    class ResponseError < Error
+      def initialize(code, msg)
+        super "#{msg} (#{code})"
+      end
+    end
+
+    extend Memoist
+
+    def initialize(endpoint, idle_timeout: 5)
+      @json_rpc_endpoint = URI.parse(endpoint)
+      @path = @json_rpc_endpoint.path.empty? ? "/" : @json_rpc_endpoint.path
+      @idle_timeout = idle_timeout
+    end
+
+    def json_rpc(method, params = [])
+      response = connection.post \
+        @path,
+        { jsonrpc: '1.0', method: method, params: params }.to_json,
+        { 'Accept' => 'application/json',
+         'Content-Type' => 'application/json' }
+      response.assert_success!
+      response = JSON.parse(response.body)
+      response['error'].tap { |error| raise ResponseError.new(error['code'], error['message']) if error }
+      response.fetch('result')
+    rescue Faraday::Error => e
+      raise ConnectionError, e
+    rescue StandardError => e
+      raise Error, e
+    end
+
+    private
+
+    def connection
+      @connection ||= Faraday.new(@json_rpc_endpoint) do |f|
+        f.adapter :net_http_persistent, pool_size: 5, idle_timeout: @idle_timeout
+      end.tap do |connection|
+        unless @json_rpc_endpoint.user.blank?
+          connection.basic_auth(@json_rpc_endpoint.user, @json_rpc_endpoint.password)
+        end
+      end
+    end
+  end
+end