feat: add chain query in sync client and provide an example

Author: achilleas-kal

examples/sync/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.client import Client
+from pyinjective.constant import Network
+
+async def main() -> None:
+    network = Network.testnet()
+    client = Client(network, insecure=True)
+    granter = "inj14au322k9munkmx5wrchz9q30juf5wjgz2cfqku"
+    grantee = "inj1hkhdaj2a2clmq5jq6mspsggqs32vynpk228q3r"
+    msg_type_url = "/injective.exchange.v1beta1.MsgCreateDerivativeLimitOrder"
+    authorizations = 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/client.py

@@ -167,6 +167,11 @@ def get_chain_id(self) -> str:
         latest_block = self.get_latest_block()
         return latest_block.block.header.chain_id
 
+    def get_grants(self, granter: str, grantee: str, **kwargs):
+        return self.stubAuthz.Grants(
+            authz_query.QueryGrantsRequest(
+                granter=granter, grantee=grantee, msg_type_url=kwargs.get("msg_type_url")))
+
     # Injective Exchange client methods
 
     # Auction RPC