test: Allow pathlib.Path as RPC argument via authproxy

Also, add datadir_path property to TestNode

test/functional/rpc_dumptxoutset.py

@@ -52,7 +52,7 @@ class DumptxoutsetTest(BitcoinTestFramework):
         # Specifying a path to an existing or invalid file will fail.
         assert_raises_rpc_error(
             -8, '{} already exists'.format(FILENAME),  node.dumptxoutset, FILENAME)
-        invalid_path = str(Path(node.datadir) / "invalid" / "path")
+        invalid_path = node.datadir_path / "invalid" / "path"
         assert_raises_rpc_error(
             -8, "Couldn't open file {}.incomplete for writing".format(invalid_path), node.dumptxoutset, invalid_path)
 

test/functional/test_framework/authproxy.py

@@ -39,6 +39,7 @@ from http import HTTPStatus
 import http.client
 import json
 import logging
+import pathlib
 import socket
 import time
 import urllib.parse
@@ -62,6 +63,8 @@ class JSONRPCException(Exception):
 def EncodeDecimal(o):
     if isinstance(o, decimal.Decimal):
         return str(o)
+    if isinstance(o, pathlib.Path):
+        return str(o)
     raise TypeError(repr(o) + " is not JSON serializable")
 
 class AuthServiceProxy():

test/functional/test_framework/test_node.py

@@ -22,7 +22,10 @@ import shlex
 import sys
 from pathlib import Path
 
-from .authproxy import JSONRPCException
+from .authproxy import (
+    JSONRPCException,
+    EncodeDecimal,
+)
 from .descriptors import descsum_create
 from .p2p import P2P_SUBVERSION
 from .util import (
@@ -35,7 +38,6 @@ from .util import (
     rpc_url,
     wait_until_helper,
     p2p_port,
-    EncodeDecimal,
 )
 
 BITCOIND_PROC_WAIT_TIMEOUT = 60
@@ -405,9 +407,13 @@ class TestNode():
         with open(self.bitcoinconf, 'w', encoding='utf8') as conf:
             conf.write(conf_data)
 
+    @property
+    def datadir_path(self) -> Path:
+        return Path(self.datadir)
+
     @property
     def chain_path(self) -> Path:
-        return Path(self.datadir) / self.chain
+        return self.datadir_path / self.chain
 
     @property
     def debug_log_path(self) -> Path:

test/functional/test_framework/util.py

@@ -211,12 +211,6 @@ def check_json_precision():
         raise RuntimeError("JSON encode/decode loses precision")
 
 
-def EncodeDecimal(o):
-    if isinstance(o, Decimal):
-        return str(o)
-    raise TypeError(repr(o) + " is not JSON serializable")
-
-
 def count_bytes(hex_string):
     return len(bytearray.fromhex(hex_string))