Backend communicating with ethereum contracts

.gitignore

@@ -2,3 +2,4 @@
 /config.py
 /__pycache__
 /oxend/*.sock
+*/__pycache__

Makefile

@@ -0,0 +1,5 @@
+uwsgi:
+	uwsgi --http 127.0.0.1:8000 --master -p 4 -w sent.py
+
+database:
+	sqlite3 sent-backend.db < schema.sqlite

abi_manager.py

@@ -0,0 +1,36 @@
+import json
+import os
+
+class ABIManager:
+    def __init__(self, abi_dir='abis'):
+        """
+        Initializes the ABIManager with the directory containing ABI JSON files.
+
+        :param abi_dir: The directory where ABI files are stored. Default is 'abis'.
+        """
+        self.abi_dir = abi_dir
+
+    def load_abi(self, artifact_name):
+        """
+        Loads the ABI from a specified artifact JSON file.
+
+        :param artifact_name: The name of the artifact file (without .json extension).
+        :return: The ABI extracted from the specified artifact JSON file.
+        :raises FileNotFoundError: If the specified file does not exist.
+        :raises KeyError: If the 'abi' key is not found in the JSON data.
+        """
+        file_path = os.path.join(self.abi_dir, f"{artifact_name}.json")
+        if not os.path.exists(file_path):
+            raise FileNotFoundError(f"No such file: {file_path}")
+
+        with open(file_path, 'r') as file:
+            data = json.load(file)
+            if 'abi' not in data:
+                raise KeyError("Missing 'abi' key in the JSON file.")
+            return data['abi']
+
+# Example usage:
+# manager = ABIManager()
+# abi = manager.load_abi('MyContract')
+# This `abi` can now be used with Web3 library to interact with a smart contract.
+