Add refresh method to Token model

app/models/token.rb

@@ -1,6 +1,7 @@
 class Token < ActiveRecord::Base
   enum standard: [:dip20, :icrc1, :unknown]
   validates :canister_id, uniqueness: true, allow_nil: true
+  before_create :refresh
 
   def transfer_fee_to_f
     if self.transfer_fee.present? && self.decimals.present?
@@ -26,4 +27,43 @@ class Token < ActiveRecord::Base
       "Get token_info coming soon."
     end
   end
+
+  def refresh
+    metadata = `dfx canister --network ic call #{self.canister_id} icrc1_metadata 2>&1`
+    if metadata.scan(/no update method/).present?
+      # TODO: Use getTokenInfo instead of getMetadata
+      metadata = `dfx canister --network ic call #{self.canister_id} getMetadata 2>&1`
+      if metadata.scan(/no update method/).present?
+        self.standard = :unknown
+      else
+        self.standard = :dip20
+
+        # TODO: Use getTokenInfo instead of getMetadata
+        tokenInfo = `dfx canister --network ic call #{self.canister_id} getTokenInfo 2>&1`
+        self.holder_number = tokenInfo.lines[2].split[2]
+
+        self.transfer_fee = metadata.lines[2].split[2].to_i
+        self.decimals = metadata.lines[3].split[2]
+        # self.owner = metadata.lines[4].split[3]
+        # self.logo_url = metadata.lines[5].split("\"")[1]
+        self.logo_url = tokenInfo.lines[8].split[2].split('"')[1]
+        self.name = metadata.lines[6].split("\"")[1]
+        self.total_supply = metadata.lines[7].split[2].to_i/(10.0**self.decimals)
+        self.symbol = metadata.lines[8].split("\"")[1]
+      end
+    else
+        self.standard = :icrc1
+        self.transfer_fee = metadata.lines[2].split[7].to_i
+        self.decimals = metadata.lines[5].split[7].to_i
+        begin
+          self.logo_url = metadata.lines[9].split("\"")[1]
+        rescue
+        end
+        self.name = metadata.lines[3].split("\"")[3]
+        total_supply = `dfx canister --network ic call #{self.canister_id} icrc1_total_supply 2>&1`
+        self.total_supply = total_supply.split[0][1..-1].to_i/(10.0**self.decimals)
+        self.symbol = metadata.lines[4].split("\"")[3]
+    end
+  end
+
 end