feat: add compute_hash to transaction

lib/ckb/types/transaction.rb

@@ -76,6 +76,13 @@ def to_h
         hash
       end
 
+      def compute_hash
+        raw_transaction_serializer = CKB::Serializers::RawTransactionSerializer.new(self)
+        blake2b = CKB::Blake2b.new
+        blake2b << Utils.hex_to_bin("0x#{raw_transaction_serializer.serialize}")
+        blake2b.hexdigest
+      end
+
       def self.from_h(hash)
         return if hash.nil?
 

lib/ckb/wallet.rb

@@ -112,9 +112,8 @@ def generate_tx(target_address, capacity, data = "0x", key: nil, fee: 0)
         outputs_data: outputs.map(&:data),
         witnesses: i.witnesses
       )
-      tx_hash = compute_transaction_hash(tx)
 
-      tx.sign(key, tx_hash)
+      tx.sign(key, tx.compute_hash)
     end
 
     # @param target_address [String]
@@ -172,7 +171,7 @@ def deposit_to_dao(capacity, key: nil)
         witnesses: i.witnesses
       )
 
-      tx_hash = compute_transaction_hash(tx)
+      tx_hash = tx.compute_hash
       send_transaction(tx.sign(key, tx_hash))
 
       Types::OutPoint.new(tx_hash: tx_hash, index: "0")
@@ -236,8 +235,7 @@ def generate_withdraw_from_dao_transaction(out_point, key: nil)
           Types::Witness.new(data: ["0x0000000000000000"])
         ]
       )
-      tx_hash = compute_transaction_hash(tx)
-      tx.sign(key, tx_hash)
+      tx.sign(key, tx.compute_hash)
     end
 
     # @param hash_hex [String] "0x..."
@@ -270,13 +268,6 @@ def lock
 
     private
 
-    def compute_transaction_hash(tx)
-      raw_transaction_serializer = CKB::Serializers::RawTransactionSerializer.new(tx)
-      blake2b = CKB::Blake2b.new
-      blake2b << Utils.hex_to_bin("0x#{raw_transaction_serializer.serialize}")
-      blake2b.hexdigest
-    end
-
     # @param transaction [CKB::Transaction]
     def send_transaction(transaction)
       api.send_transaction(transaction)