refactor: move read_xor_key() to TestNode

Author: tdb3

Diff for: test/functional/feature_blocksxor.py

@@ -9,7 +9,6 @@
 from test_framework.util import (
     assert_equal,
     assert_greater_than,
-    read_xor_key,
     util_xor,
 )
 from test_framework.wallet import MiniWallet
@@ -39,7 +38,7 @@ def run_test(self):
 
         self.log.info("Shut down node and un-XOR block/undo files manually")
         self.stop_node(0)
-        xor_key = read_xor_key(node=node)
+        xor_key = node.read_xor_key()
         for data_file in sorted(block_files + undo_files):
             self.log.debug(f"Rewriting file {data_file}...")
             with open(data_file, 'rb+') as f:

Diff for: test/functional/feature_reindex.py

@@ -14,7 +14,6 @@
 from test_framework.messages import MAGIC_BYTES
 from test_framework.util import (
     assert_equal,
-    read_xor_key,
     util_xor,
 )
 
@@ -43,7 +42,7 @@ def out_of_order(self):
         # we're generating them rather than getting them from peers), so to
         # test out-of-order handling, swap blocks 1 and 2 on disk.
         blk0 = self.nodes[0].blocks_path / "blk00000.dat"
-        xor_dat = read_xor_key(node=self.nodes[0])
+        xor_dat = self.nodes[0].read_xor_key()
 
         with open(blk0, 'r+b') as bf:
             # Read at least the first few blocks (including genesis)

Diff for: test/functional/test_framework/test_node.py

@@ -469,6 +469,11 @@ def blocks_path(self) -> Path:
     def blocks_key_path(self) -> Path:
         return self.blocks_path / "xor.dat"
 
+    def read_xor_key(self) -> bytes:
+        with open(self.blocks_key_path, "rb") as xor_f:
+            NUM_XOR_BYTES = 8 # From InitBlocksdirXorKey::xor_key.size()
+            return xor_f.read(NUM_XOR_BYTES)
+
     @property
     def wallets_path(self) -> Path:
         return self.chain_path / "wallets"

Diff for: test/functional/test_framework/util.py

@@ -515,12 +515,6 @@ def check_node_connections(*, node, num_in, num_out):
     assert_equal(info["connections_out"], num_out)
 
 
-def read_xor_key(*, node):
-    with open(node.blocks_key_path, "rb") as xor_f:
-        NUM_XOR_BYTES = 8 # From InitBlocksdirXorKey::xor_key.size()
-        return xor_f.read(NUM_XOR_BYTES)
-
-
 # Transaction/Block functions
 #############################