{"action":"created","comment":{"url":"https://api.github.com/repos/bigchaindb/bigchaindb/pulls/comments/80669944","pull_request_review_id":1711023,"id":80669944,"diff_hunk":"@@ -0,0 +1,209 @@\n+from functools import reduce\n+from operator import and_\n+\n+from bigchaindb_common.crypto import hash_data, VerifyingKey, SigningKey\n+from bigchaindb_common.exceptions import (InvalidHash, InvalidSignature,\n+                                          OperationError, DoubleSpend,\n+                                          TransactionDoesNotExist)\n+from bigchaindb_common.transaction import Transaction\n+from bigchaindb_common.util import gen_timestamp, serialize\n+\n+\n+class Transaction(Transaction):\n+    def validate(self, bigchain):\n+        \"\"\"Validate a transaction.\n+\n+        Args:\n+            bigchain (Bigchain): an instantiated bigchaindb.Bigchain object.\n+\n+        Returns:\n+            The transaction (Transaction) if the transaction is valid else it\n+            raises an exception describing the reason why the transaction is\n+            invalid.\n+\n+        Raises:\n+            OperationError: if the transaction operation is not supported\n+            TransactionDoesNotExist: if the input of the transaction is not found\n+            TransactionOwnerError: if the new transaction is using an input it doesn't own\n+            DoubleSpend: if the transaction is a double spend\n+            InvalidHash: if the hash of the transaction is wrong\n+            InvalidSignature: if the signature of the transaction is wrong\n+        \"\"\"\n+        if len(self.fulfillments) == 0:\n+            raise ValueError('Transaction contains no fulfillments')\n+\n+        input_conditions = []\n+        inputs_defined = reduce(and_, [bool(ffill.tx_input) for ffill\n+                                       in self.fulfillments])\n+        if self.operation in (Transaction.CREATE, Transaction.GENESIS):\n+            if inputs_defined:\n+                raise ValueError('A CREATE operation has no inputs')\n+        elif self.operation == Transaction.TRANSFER:\n+            if not inputs_defined:\n+                raise ValueError('Only `CREATE` transactions can have null inputs')\n+\n+            for ffill in self.fulfillments:\n+                input_txid = ffill.tx_input.txid\n+                input_cid = ffill.tx_input.cid\n+                input_tx = bigchain.get_transaction(input_txid)\n+                if input_tx is None:\n+                    raise TransactionDoesNotExist(\"input `{}` doesn't exist\"\n+                                                  .format(input_txid))\n+                else:\n+                    input_conditions.append(input_tx.conditions[input_cid])\n+\n+                spent = bigchain.get_spent(input_txid, ffill.tx_input.cid)\n+                if spent and spent.id != self.id:","path":"bigchaindb/models.py","position":56,"original_position":56,"commit_id":"76c796429055d180dcf3caaf2a95e1591e0d743c","original_commit_id":"76c796429055d180dcf3caaf2a95e1591e0d743c","user":{"login":"sohkai","id":4166642,"avatar_url":"https://avatars.githubusercontent.com/u/4166642?v=3","gravatar_id":"","url":"https://api.github.com/users/sohkai","html_url":"https://github.com/sohkai","followers_url":"https://api.github.com/users/sohkai/followers","following_url":"https://api.github.com/users/sohkai/following{/other_user}","gists_url":"https://api.github.com/users/sohkai/gists{/gist_id}","starred_url":"https://api.github.com/users/sohkai/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sohkai/subscriptions","organizations_url":"https://api.github.com/users/sohkai/orgs","repos_url":"https://api.github.com/users/sohkai/repos","events_url":"https://api.github.com/users/sohkai/events{/privacy}","received_events_url":"https://api.github.com/users/sohkai/received_events","type":"User","site_admin":false},"body":"Should put this before `input_conditions.append()`; if we raise here, the append is wasted. Could also use `input_cid` instead of 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