Initial commit

app/models/withdraw_limit.rb

@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+class WithdrawLimit < ApplicationRecord
+
+  # Default value for kyc_level, group name and currency_id in WithdrawLimit table;
+  ANY = 'any'
+
+  enum kind: { fiat: 0, crypto: 1, both: 2 }
+    # == Attributes ===========================================================
+
+  # == Extensions ===========================================================
+
+  # == Relationships ========================================================
+
+  belongs_to :currency, optional: true
+
+  # == Validations ==========================================================
+
+  validates :kyc_level,
+            presence: true,
+            uniqueness: { scope: %i[group kind] }
+
+  validates :group,
+            presence: true
+
+  validates :limit_24_hour,
+            :limit_1_month,
+            presence: true
+
+  # == Scopes ===============================================================
+
+  # == Callbacks ============================================================
+
+  before_create { self.group = self.group.strip.downcase }
+  after_commit :wipe_cache
+
+  # == Class Methods ========================================================
+  class << self
+    # Get withdrawal limit for specific withdraw that based on member kyc_level and group.
+    # WithdrawLimit record selected with the next priorities:
+    #  1. kyc_level, group match
+    #  2. kyc_level match
+    #  3. group match
+    #  5. kyc_level, group are 'any'
+    #  6. default (zero limits)
+    def for(kyc_level:, group:, kind:)
+      WithdrawLimit
+        .where(kyc_level: [kyc_level, ANY], group: [group, ANY], kind: kind)
+        .max_by(&:weight) || WithdrawLimit.new
+    end
+  end
+
+  # == Instance Methods =====================================================
+
+  # Withdraw limit suitability expressed in weight.
+  # Withdraw limit with the greatest weight selected.
+  # Kyc_level has greater weight then group match.
+  # E.g Withdrawal for member with kyc_level 2, group 'vip-0''
+  # (kyc_level == 2     && group == 'vip-0') >
+  # (kyc_level == 2     && group == 'any') >
+  # (kyc_level == 'any' && group == 'vip-0') >
+  # (kyc_level == 'any' && group == 'any') >
+  def weight
+    (kyc_level == 'any' ? 0 : 10) + (group == 'any' ? 0 : 1)
+  end
+
+  def wipe_cache
+    ::Rails.cache.delete_matched("withdraw_limits_fees*")
+  end
+end
+
+# == Schema Information
+# Schema version: 20201125134745
+#
+# Table name: withdraw_limits
+#
+#  id            :bigint           not null, primary key
+#  group         :string(32)       default("any"), not null
+#  kyc_level     :string(32)       default("any"), not null
+#  limit_24_hour :decimal(32, 16)  default(0.0), not null
+#  limit_1_month :decimal(32, 16)  default(0.0), not null
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#
+# Indexes
+#
+#  index_withdraw_limits_on_group                (group)
+#  index_withdraw_limits_on_group_and_kyc_level  (group,kyc_level) UNIQUE
+#  index_withdraw_limits_on_kyc_level            (kyc_level)
+#