fix fee payer and balance

* Handle account not yet created for fee payer
* Use coin balance instead of resource reading due to FA migration

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to the Aptos Python SDK will be captured in this file. This
 
 ## Unreleased
 
+## 0.9.1
+- For `account_sequence_number`, return 0 if account has yet to be created to better support sponsored transactions create account if not exists
+- For `account_balance`, Use `0x1::coin::balance` instead of reading the resource
+
 ## 0.9.0
 - Add Multikey support for Python, with an example
 - Deprecate and remove non-BCS transaction submission

aptos_sdk/async_client.py

@@ -126,12 +126,14 @@ async def account_balance(
         :param ledger_version: Ledger version to get state of account. If not provided, it will be the latest version.
         :return: The Aptos coin balance associated with the account
         """
-        resource = await self.account_resource(
-            account_address,
-            "0x1::coin::CoinStore<0x1::aptos_coin::AptosCoin>",
+        result = await self.view_bcs_payload(
+            "0x1::coin",
+            "balance",
+            [TypeTag(StructTag.from_str("0x1::aptos_coin::AptosCoin"))],
+            [TransactionArgument(account_address, Serializer.struct)],
             ledger_version,
         )
-        return int(resource["data"]["coin"]["value"])
+        return int(result[0])
 
     async def account_sequence_number(
         self, account_address: AccountAddress, ledger_version: Optional[int] = None
@@ -143,8 +145,13 @@ async def account_sequence_number(
         :param ledger_version: Ledger version to get state of account. If not provided, it will be the latest version.
         :return: The current sequence number for the specified address.
         """
-        account_res = await self.account(account_address, ledger_version)
-        return int(account_res["sequence_number"])
+        try:
+            account_res = await self.account(account_address, ledger_version)
+            return int(account_res["sequence_number"])
+        except ApiError as ae:
+            if ae.status_code != 404:
+                raise
+            return 0
 
     async def account_resource(
         self,

examples/common.py

@@ -11,11 +11,11 @@
 # :!:>section_1
 FAUCET_URL = os.getenv(
     "APTOS_FAUCET_URL",
-    "http://localhost:8081",
+    "https://faucet.devnet.aptoslabs.com",
 )
 INDEXER_URL = os.getenv(
     "APTOS_INDEXER_URL",
     "https://api.devnet.aptoslabs.com/v1/graphql",
 )
-NODE_URL = os.getenv("APTOS_NODE_URL", "http://localhost:8080/v1")
+NODE_URL = os.getenv("APTOS_NODE_URL", "https://api.devnet.aptoslabs.com/v1")
 # <:!:section_1

examples/fee_payer_transfer_coin.py

@@ -4,7 +4,7 @@
 import asyncio
 
 from aptos_sdk.account import Account
-from aptos_sdk.async_client import ApiError, FaucetClient, ResourceNotFound, RestClient
+from aptos_sdk.async_client import FaucetClient, RestClient
 from aptos_sdk.authenticator import Authenticator, FeePayerAuthenticator
 from aptos_sdk.bcs import Serializer
 from aptos_sdk.transactions import (
@@ -38,20 +38,8 @@ async def main():
 
     print("\n=== Initial Data ===")
     # :!:>section_4
-    try:
-        alice_sequence_number = await rest_client.account_sequence_number(
-            alice.address()
-        )
-        raise Exception("This should never be accessed")
-    except ApiError:
-        alice_sequence_number = 0
-
-    try:
-        bob_balance = await rest_client.account_balance(bob.address())
-        raise Exception("This should never be accessed")
-    except ResourceNotFound:
-        bob_balance = None
-
+    alice_sequence_number = await rest_client.account_sequence_number(alice.address())
+    bob_balance = await rest_client.account_balance(bob.address())
     sponsor_balance = await rest_client.account_balance(sponsor.address())
     print(f"Alice sequence number: {alice_sequence_number}")
     print(f"Bob balance: {bob_balance}")

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aptos-sdk"
-version = "0.9.0"
+version = "0.9.1"
 description = "Aptos SDK"
 authors = ["Aptos Labs <[email protected]>"]
 license = "Apache-2.0"