add chain query in async client and provide an example

Author: achilleas-kal

examples/async/exchange_client/authz_rpc/1_Grants.py

@@ -0,0 +1,33 @@
+# Copyright 2021 Injective Labs
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Injective Exchange API client for Python. Example only."""
+
+import asyncio
+import logging
+
+from pyinjective.async_client import AsyncClient
+from pyinjective.constant import Network
+
+async def main() -> None:
+    network = Network.testnet()
+    client = AsyncClient(network, insecure=True)
+    granter = "inj14au322k9munkmx5wrchz9q30juf5wjgz2cfqku"
+    grantee = "inj1hkhdaj2a2clmq5jq6mspsggqs32vynpk228q3r"
+    msg_type_url = "/injective.exchange.v1beta1.MsgCreateDerivativeLimitOrder"
+    authorizations = await client.get_grants(granter=granter, grantee=grantee, msg_type_url=msg_type_url)
+    print(authorizations)
+
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.INFO)
+    asyncio.get_event_loop().run_until_complete(main())

pyinjective/async_client.py

@@ -1,10 +1,8 @@
 import time
-
 import grpc
-
 from typing import List, Optional, Tuple, Union
 
-from .exceptions import NotFoundError
+from .exceptions import NotFoundError, EmptyMsgError
 
 from .proto.cosmos.base.abci.v1beta1 import abci_pb2 as abci_type
 
@@ -17,11 +15,15 @@
     query_pb2 as auth_query,
     auth_pb2 as auth_type,
 )
+from .proto.cosmos.authz.v1beta1 import (
+    query_pb2_grpc as authz_query_grpc,
+    query_pb2 as authz_query,
+    authz_pb2 as authz_type,
+)
 from .proto.cosmos.tx.v1beta1 import (
     service_pb2_grpc as tx_service_grpc,
     service_pb2 as tx_service,
 )
-
 from .proto.exchange import (
     injective_accounts_rpc_pb2 as exchange_accounts_rpc_pb,
     injective_accounts_rpc_pb2_grpc as exchange_accounts_rpc_grpc,
@@ -140,6 +142,11 @@ async def get_chain_id(self) -> str:
         latest_block = await self.get_latest_block()
         return latest_block.block.header.chain_id
 
+    async def get_grants(self, granter: str, grantee: str, **kwargs):
+        return await self.stubAuthz.Grants(
+            authz_query.QueryGrantsRequest(
+                granter=granter, grantee=grantee, msg_type_url=kwargs.get("msg_type_url")))
+
     # Injective Exchange client methods
 
     # Auction RPC