Merge #15495: Add regtests for HTTP status codes

8f5d943 Add regtests for HTTP status codes. (Daniel Kraft)

Pull request description:

  This adds explicit tests for the returned HTTP status codes to `interface_rpc.py` (for error cases) and the HTTP JSON-RPC client in general for success.

  #15381 brought up discussion about the HTTP status codes in general, and the general opinion was that the current choice may not be ideal but should not be changed to preserve compatibility with existing JSON-RPC clients.  Thus it makes sense to actually test the current status to ensure this desired compatibility is not broken accidentally.

ACKs for commit 8f5d94:
  laanwj:
    utACK 8f5d943
  promag:
    utACK 8f5d943.
  jonasschnelli:
    utACK 8f5d943

Tree-SHA512: 82503ccd134dd9145304e95cb6c61755f100bee27593d567cdd5c0c554d47e7b06d937456cab04107f46f4984930355db65d5e711008a0b05f2b8feec9f2950e

Author: jonasschnelli

test/functional/interface_rpc.py

@@ -4,9 +4,19 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Tests some generic aspects of the RPC interface."""
 
+from test_framework.authproxy import JSONRPCException
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_greater_than_or_equal
 
+def expect_http_status(expected_http_status, expected_rpc_code,
+                       fcn, *args):
+    try:
+        fcn(*args)
+        raise AssertionError("Expected RPC error %d, got none" % expected_rpc_code)
+    except JSONRPCException as exc:
+        assert_equal(exc.error["code"], expected_rpc_code)
+        assert_equal(exc.http_status, expected_http_status)
+
 class RPCInterfaceTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
@@ -48,9 +58,16 @@ def test_batch_request(self):
         assert_equal(result_by_id[3]['error'], None)
         assert result_by_id[3]['result'] is not None
 
+    def test_http_status_codes(self):
+        self.log.info("Testing HTTP status codes for JSON-RPC requests...")
+
+        expect_http_status(404, -32601, self.nodes[0].invalidmethod)
+        expect_http_status(500, -8, self.nodes[0].getblockhash, 42)
+
     def run_test(self):
         self.test_getrpcinfo()
         self.test_batch_request()
+        self.test_http_status_codes()
 
 
 if __name__ == '__main__':

test/functional/test_framework/authproxy.py

@@ -35,6 +35,7 @@
 
 import base64
 import decimal
+from http import HTTPStatus
 import http.client
 import json
 import logging
@@ -49,13 +50,14 @@
 log = logging.getLogger("BitcoinRPC")
 
 class JSONRPCException(Exception):
-    def __init__(self, rpc_error):
+    def __init__(self, rpc_error, http_status=None):
         try:
             errmsg = '%(message)s (%(code)i)' % rpc_error
         except (KeyError, TypeError):
             errmsg = ''
         super().__init__(errmsg)
         self.error = rpc_error
+        self.http_status = http_status
 
 
 def EncodeDecimal(o):
@@ -131,19 +133,26 @@ def get_request(self, *args, **argsn):
 
     def __call__(self, *args, **argsn):
         postdata = json.dumps(self.get_request(*args, **argsn), default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
-        response = self._request('POST', self.__url.path, postdata.encode('utf-8'))
+        response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
         if response['error'] is not None:
-            raise JSONRPCException(response['error'])
+            raise JSONRPCException(response['error'], status)
         elif 'result' not in response:
             raise JSONRPCException({
-                'code': -343, 'message': 'missing JSON-RPC result'})
+                'code': -343, 'message': 'missing JSON-RPC result'}, status)
+        elif status != HTTPStatus.OK:
+            raise JSONRPCException({
+                'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
         else:
             return response['result']
 
     def batch(self, rpc_call_list):
         postdata = json.dumps(list(rpc_call_list), default=EncodeDecimal, ensure_ascii=self.ensure_ascii)
         log.debug("--> " + postdata)
-        return self._request('POST', self.__url.path, postdata.encode('utf-8'))
+        response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
+        if status != HTTPStatus.OK:
+            raise JSONRPCException({
+                'code': -342, 'message': 'non-200 HTTP status code but no JSON-RPC error'}, status)
+        return response
 
     def _get_response(self):
         req_start_time = time.time()
@@ -162,8 +171,9 @@ def _get_response(self):
 
         content_type = http_response.getheader('Content-Type')
         if content_type != 'application/json':
-            raise JSONRPCException({
-                'code': -342, 'message': 'non-JSON HTTP response with \'%i %s\' from server' % (http_response.status, http_response.reason)})
+            raise JSONRPCException(
+                {'code': -342, 'message': 'non-JSON HTTP response with \'%i %s\' from server' % (http_response.status, http_response.reason)},
+                http_response.status)
 
         responsedata = http_response.read().decode('utf8')
         response = json.loads(responsedata, parse_float=decimal.Decimal)
@@ -172,7 +182,7 @@ def _get_response(self):
             log.debug("<-%s- [%.6f] %s" % (response["id"], elapsed, json.dumps(response["result"], default=EncodeDecimal, ensure_ascii=self.ensure_ascii)))
         else:
             log.debug("<-- [%.6f] %s" % (elapsed, responsedata))
-        return response
+        return response, http_response.status
 
     def __truediv__(self, relative_uri):
         return AuthServiceProxy("{}/{}".format(self.__service_url, relative_uri), self._service_name, connection=self.__conn)