add dht seed node script

lbry/dht/protocol/data_store.py

@@ -16,6 +16,9 @@ class DictDataStore:
         self._peer_manager = peer_manager
         self.completed_blobs: typing.Set[str] = set()
 
+    def __len__(self):
+        return self._data_store.__len__()
+
     def removed_expired_peers(self):
         now = self.loop.time()
         keys = list(self._data_store.keys())

scripts/dht_node.py

@@ -0,0 +1,38 @@
+import asyncio
+import argparse
+import logging
+
+from lbry.dht.constants import generate_id
+from lbry.dht.node import Node
+from lbry.dht.peer import PeerManager
+from lbry.extras.daemon.storage import SQLiteStorage
+from lbry.conf import Config
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)-4s %(name)s:%(lineno)d: %(message)s")
+log = logging.getLogger(__name__)
+
+
+async def main(host: str, port: int):
+    loop = asyncio.get_event_loop()
+    conf = Config()
+    storage = SQLiteStorage(conf, ":memory:", loop, loop.time)
+    await storage.open()
+    node = Node(
+        loop, PeerManager(loop), generate_id(), port, port, 3333, None,
+        storage=storage
+    )
+    node.start(host, conf.known_dht_nodes)
+    while True:
+        await asyncio.sleep(10)
+        log.info("Known peers: %d. Storing contact information for %d blobs from %d peers.",
+                 len(node.protocol.routing_table.get_peers()), len(node.protocol.data_store),
+                 len(node.protocol.data_store.get_storing_contacts()))
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description="Starts a single DHT node, which then can be used as a seed node or just a contributing node.")
+    parser.add_argument("--host", default='0.0.0.0', help="Host to listen for requests. Default: 0.0.0.0")
+    parser.add_argument("--port", default=4444, help="Port to listen for requests. Default: 4444")
+    args = parser.parse_args()
+    asyncio.run(main(args.host, args.port))