work on flood fill network

src/streamfill/__init__.py

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+from .extracted25519 import extract_ed25519_from_onion_address

src/streamfill/extracted25519.py

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+from base64 import b32decode
+from typing import TYPE_CHECKING
+
+from onionrutils.bytesconverter import str_to_bytes
+
+if TYPE_CHECKING:
+    from onionrtypes import Ed25519PublicKeyBytes, OnionAddressString
+
+
+def extract_ed25519_from_onion_address(
+        address: OnionAddressString) -> Ed25519PublicKeyBytes:
+    address = str_to_bytes(address).replace(b'.onion', b'').upper()
+    ed25519 = b32decode(address)[:-3]
+    return ed25519

src/streamfill/neighbors.py

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+from onionrtypes import OnionAddressString
+from typing import Iterable
+from .extracted25519 import extract_ed25519_from_onion_address
+
+
+def identify_neighbors(
+        address: OnionAddressString,
+        peers: Iterable[OnionAddressString],
+        closest_n: int) -> OnionAddressString:
+
+    address = extract_ed25519_from_onion_address(address)
+    address_int = int.from_bytes(address, "big")
+
+    def _calc_closeness(y):
+        return abs(address_int - int.from_bytes(y, "big"))
+
+
+    peer_ed_keys = list(map(extract_ed25519_from_onion_address, peers))
+    differences = list(map(_calc_closeness, peer_ed_keys))
+
+    return sorted(differences)[:closest_n]
+