[IND-416] Add default fee for v4 python client (#54)

v4-client-py/.gitignore

@@ -127,3 +127,6 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
+
+# IDE
+.idea/

v4-client-py/v4_client_py/chain/aerial/client/utils.py

@@ -18,6 +18,7 @@ def prepare_and_broadcast_basic_transaction(
     gas_limit: Optional[int] = None,
     memo: Optional[str] = None,
     broadcast_mode: BroadcastMode = None,
+    fee: int = 5000,
 ) -> SubmittedTx:
     """Prepare and broadcast basic transaction.
 
@@ -27,17 +28,16 @@ def prepare_and_broadcast_basic_transaction(
     :param account: The account
     :param gas_limit: The gas limit
     :param memo: Transaction memo, defaults to None
+    :param broadcast_mode: Broadcast mode, defaults to None
+    :param fee: Transaction fee, defaults to 5000. Denomination is determined by the network config.
 
     :return: broadcast transaction
     """
     # query the account information for the sender
     if account is None:
         account = client.query_account(sender.address())
 
-    if gas_limit is not None:
-        # simply build the fee from the provided gas limit
-        fee = client.estimate_fee_from_gas(gas_limit)
-    else:
+    if gas_limit is None:
 
         # we need to build up a representative transaction so that we can accurately simulate it
         tx.seal(
@@ -50,12 +50,12 @@ def prepare_and_broadcast_basic_transaction(
         tx.complete()
 
         # simulate the gas and fee for the transaction
-        gas_limit, fee = client.estimate_gas_and_fee_for_tx(tx)
+        gas_limit, _ = client.estimate_gas_and_fee_for_tx(tx)
 
     # finally, build the final transaction that will be executed with the correct gas and fee values
     tx.seal(
         SigningCfg.direct(sender.public_key(), account.sequence),
-        fee=fee,
+        fee=f"{fee}{client.network_config.fee_denomination}",
         gas_limit=gas_limit,
         memo=memo,
     )

v4-client-py/v4_client_py/chain/aerial/config.py

@@ -71,6 +71,21 @@ def fetchai_dorado_testnet(cls) -> "NetworkConfig":
             faucet_url="https://faucet-dorado.fetch.ai",
         )
 
+    @classmethod
+    def fetch_dydx_testnet(cls) -> "NetworkConfig":
+        """Dydx testnet.
+
+        :return: Network configuration
+        """
+        return NetworkConfig(
+            chain_id="dydx",
+            url="grpc+https://v4.testnet.dydx.exchange",
+            fee_minimum_gas_price=5000000000,
+            fee_denomination="dv4tnt",
+            staking_denomination="dv4tnt",
+            faucet_url="http://faucet.v4testnet.dydx.exchange",
+        )
+
     @classmethod
     def fetchai_alpha_testnet(cls):
         """Get the fetchai alpha testnet.
@@ -88,12 +103,12 @@ def fetchai_beta_testnet(cls):
         raise RuntimeError("No beta testnet available")
 
     @classmethod
-    def fetchai_stable_testnet(cls):
-        """Get the fetchai stable testnet.
+    def fetch_dydx_stable_testnet(cls):
+        """Get the dydx stable testnet.
 
-        :return: fetchai stable testnet. For now dorado is fetchai stable testnet.
+        :return: dydx stable testnet.
         """
-        return cls.fetchai_dorado_testnet()
+        return cls.fetch_dydx_testnet()
 
     @classmethod
     def fetchai_mainnet(cls) -> "NetworkConfig":
@@ -129,7 +144,7 @@ def latest_stable_testnet(cls) -> "NetworkConfig":
         :return: latest stable testnet
         """
         warnings.warn(
-            "latest_stable_testnet is deprecated, use fetchai_stable_testnet instead",
+            "latest_stable_testnet is deprecated, use fetch_dydx_stable_testnet instead",
             DeprecationWarning,
         )
-        return cls.fetchai_stable_testnet()
+        return cls.fetch_dydx_stable_testnet()

v4-client-py/v4_client_py/clients/modules/post.py

@@ -57,6 +57,7 @@ def send_message(
             gas_limit=gas_limit,
             memo=None,
             broadcast_mode=broadcast_mode if (broadcast_mode != None) else self.default_broadcast_mode(msg),
+            fee=0 if zeroFee else 5000,
             )
 
     def place_order(