add a graph data exporter

tools/graph_data_exporter.py

@@ -0,0 +1,34 @@
+import csv
+import time
+from typing import List
+
+from google.protobuf.json_format import MessageToDict
+
+from node_launcher.node_set.lnd_client.rpc_pb2 import ChannelGraph
+from tools.channel_balancer import lnd_client
+
+
+def save_to_csv(name: str, data: List[dict]):
+    timestamp = time.time()
+    with open(f'{name}-{timestamp}.csv', 'w') as f:
+        w = csv.DictWriter(f, data[0].keys())
+        w.writeheader()
+        for d in data:
+            w.writerow(d)
+
+
+def convert_to_dict(data):
+    data = [MessageToDict(d) for d in data]
+    return data
+
+
+def extract_data():
+    graph: ChannelGraph = lnd_client.get_graph()
+    nodes = convert_to_dict(graph.nodes)
+    edges = convert_to_dict(graph.edges)
+    save_to_csv(name='nodes', data=nodes)
+    save_to_csv(name='edges', data=edges)
+
+
+if __name__ == '__main__':
+    extract_data()