[tests] allow tests to be run with --usecli

test_framework accepts a new --usecli parameter. Running the test with
this parameter will cause all RPCs to be sent through bitcoin-cli rather
than directly over http. By default, individual test cases do not
support --usecli, and self.supports_cli must be set to True in the
set_test_params method.

We can make supports_cli default to True in future once we know which
tests will fail with use_cli.

test/functional/create_cache.py

@@ -16,6 +16,7 @@ class CreateCache(BitcoinTestFramework):
 
     def set_test_params(self):
         self.num_nodes = 0
+        self.supports_cli = True
 
     def setup_network(self):
         pass

test/functional/test_framework/test_framework.py

@@ -62,6 +62,7 @@ class BitcoinTestFramework():
         self.setup_clean_chain = False
         self.nodes = []
         self.mocktime = 0
+        self.supports_cli = False
         self.set_test_params()
 
         assert hasattr(self, "num_nodes"), "Test must set self.num_nodes in set_test_params()"
@@ -91,6 +92,8 @@ class BitcoinTestFramework():
                           help="Location of the test framework config file")
         parser.add_option("--pdbonfailure", dest="pdbonfailure", default=False, action="store_true",
                           help="Attach a python debugger if test fails")
+        parser.add_option("--usecli", dest="usecli", default=False, action="store_true",
+                          help="use bitcoin-cli instead of RPC for all commands")
         self.add_options(parser)
         (self.options, self.args) = parser.parse_args()
 
@@ -113,6 +116,8 @@ class BitcoinTestFramework():
         success = TestStatus.FAILED
 
         try:
+            if self.options.usecli and not self.supports_cli:
+                raise SkipTest("--usecli specified but test does not support using CLI")
             self.setup_chain()
             self.setup_network()
             self.run_test()
@@ -213,7 +218,7 @@ class BitcoinTestFramework():
         assert_equal(len(extra_args), num_nodes)
         assert_equal(len(binary), num_nodes)
         for i in range(num_nodes):
-            self.nodes.append(TestNode(i, self.options.tmpdir, extra_args[i], rpchost, timewait=timewait, binary=binary[i], stderr=None, mocktime=self.mocktime, coverage_dir=self.options.coveragedir))
+            self.nodes.append(TestNode(i, self.options.tmpdir, extra_args[i], rpchost, timewait=timewait, binary=binary[i], stderr=None, mocktime=self.mocktime, coverage_dir=self.options.coveragedir, use_cli=self.options.usecli))
 
     def start_node(self, i, extra_args=None, stderr=None):
         """Start a bitcoind"""

test/functional/test_framework/test_node.py

@@ -42,7 +42,7 @@ class TestNode():
     To make things easier for the test writer, any unrecognised messages will
     be dispatched to the RPC connection."""
 
-    def __init__(self, i, dirname, extra_args, rpchost, timewait, binary, stderr, mocktime, coverage_dir):
+    def __init__(self, i, dirname, extra_args, rpchost, timewait, binary, stderr, mocktime, coverage_dir, use_cli=False):
         self.index = i
         self.datadir = os.path.join(dirname, "node" + str(i))
         self.rpchost = rpchost
@@ -62,6 +62,7 @@ class TestNode():
         self.args = [self.binary, "-datadir=" + self.datadir, "-server", "-keypool=1", "-discover=0", "-rest", "-logtimemicros", "-debug", "-debugexclude=libevent", "-debugexclude=leveldb", "-mocktime=" + str(mocktime), "-uacomment=testnode%d" % i]
 
         self.cli = TestNodeCLI(os.getenv("BITCOINCLI", "bitcoin-cli"), self.datadir)
+        self.use_cli = use_cli
 
         self.running = False
         self.process = None
@@ -73,7 +74,10 @@ class TestNode():
         self.p2ps = []
 
     def __getattr__(self, name):
-        """Dispatches any unrecognised messages to the RPC connection."""
+        """Dispatches any unrecognised messages to the RPC connection or a CLI instance."""
+        if self.use_cli:
+            return getattr(self.cli, name)
+        else:
             assert self.rpc_connected and self.rpc is not None, "Error: no RPC connection"
             return getattr(self.rpc, name)
 
@@ -114,6 +118,9 @@ class TestNode():
         raise AssertionError("Unable to connect to bitcoind")
 
     def get_wallet_rpc(self, wallet_name):
+        if self.use_cli:
+            return self.cli("-rpcwallet={}".format(wallet_name))
+        else:
             assert self.rpc_connected
             assert self.rpc
             wallet_path = "wallet/%s" % wallet_name
@@ -210,6 +217,7 @@ class TestNodeCLI():
         self.binary = binary
         self.datadir = datadir
         self.input = None
+        self.log = logging.getLogger('TestFramework.bitcoincli')
 
     def __call__(self, *args, input=None):
         # TestNodeCLI is callable with bitcoin-cli command-line args
@@ -240,6 +248,7 @@ class TestNodeCLI():
         if named_args:
             p_args += ["-named"]
         p_args += [command] + pos_args + named_args
+        self.log.debug("Running bitcoin-cli command: %s" % command)
         process = subprocess.Popen(p_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
         cli_stdout, cli_stderr = process.communicate(input=self.input)
         returncode = process.poll()