[tests] refactor interface_rest.py to avoid code repetition

Also refactor txout index parsing and formatting.

test/functional/interface_rest.py

@@ -4,6 +4,7 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the REST API."""
 from decimal import Decimal
+from enum import Enum
 from io import BytesIO
 import json
 from codecs import encode
@@ -21,25 +22,20 @@
     hex_str_to_bytes,
 )
 
-def http_get_call(host, port, path, response_object=0):
-    """Make a simple HTTP GET request."""
-    conn = http.client.HTTPConnection(host, port)
-    conn.request('GET', path)
+class ReqType(Enum):
+    JSON = 1
+    BIN = 2
+    HEX = 3
 
-    if response_object:
-        return conn.getresponse()
+class RetType(Enum):
+    OBJ = 1
+    BYTES = 2
+    JSON = 3
 
-    return conn.getresponse().read().decode('utf-8')
-
-def http_post_call(host, port, path, requestdata='', response_object=0):
-    """Make a simple HTTP POST request with a request body."""
-    conn = http.client.HTTPConnection(host, port)
-    conn.request('POST', path, requestdata)
-
-    if response_object:
-        return conn.getresponse()
-
-    return conn.getresponse().read()
+def filter_output_indices_by_value(vouts, value):
+    for vout in vouts:
+        if vout['value'] == value:
+            yield vout['n']
 
 class RESTTest (BitcoinTestFramework):
     def set_test_params(self):
@@ -50,10 +46,35 @@ def set_test_params(self):
     def setup_network(self, split=False):
         super().setup_network()
         connect_nodes_bi(self.nodes, 0, 2)
+        self.url = urllib.parse.urlparse(self.nodes[0].url)
+
+    def test_rest_request(self, uri, http_method='GET', req_type=ReqType.JSON, body='', status=200, ret_type=RetType.JSON):
+        rest_uri = '/rest' + uri
+        if req_type == ReqType.JSON:
+            rest_uri += '.json'
+        elif req_type == ReqType.BIN:
+            rest_uri += '.bin'
+        elif req_type == ReqType.HEX:
+            rest_uri += '.hex'
+
+        conn = http.client.HTTPConnection(self.url.hostname, self.url.port)
+        self.log.debug('%s %s %s', http_method, rest_uri, body)
+        if http_method == 'GET':
+            conn.request('GET', rest_uri)
+        elif http_method == 'POST':
+            conn.request('POST', rest_uri, body)
+        resp = conn.getresponse()
+
+        assert_equal(resp.status, status)
+
+        if ret_type == RetType.OBJ:
+            return resp
+        elif ret_type == RetType.BYTES:
+            return resp.read()
+        elif ret_type == RetType.JSON:
+            return json.loads(resp.read().decode('utf-8'), parse_float=Decimal)
 
     def run_test(self):
-        url = urllib.parse.urlparse(self.nodes[0].url)
-
         self.log.info("Mine blocks and send Bitcoin to node 1")
 
         self.nodes[0].generate(1)
@@ -73,49 +94,40 @@ def run_test(self):
 
         self.log.info("Load the transaction using the /tx URI")
 
-        json_request = "/rest/tx/{}.json".format(txid)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
-        vintx = json_obj['vin'][0]['txid']  # get the vin to later check for utxo (should be spent by then)
+        json_obj = self.test_rest_request("/tx/{}".format(txid))
+        spent = (json_obj['vin'][0]['txid'], json_obj['vin'][0]['vout'])  # get the vin to later check for utxo (should be spent by then)
         # get n of 0.1 outpoint
-        n = 0
-        for vout in json_obj['vout']:
-            if vout['value'] == 0.1:
-                n = vout['n']
+        n, = filter_output_indices_by_value(json_obj['vout'], Decimal('0.1'))
+        spending = (txid, n)
 
         self.log.info("Query an unspent TXO using the /getutxos URI")
 
-        json_request = "/rest/getutxos/{}-{}.json".format(txid, str(n))
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/{}-{}".format(*spending))
 
         # Check chainTip response
         assert_equal(json_obj['chaintipHash'], bb_hash)
 
         # Make sure there is one utxo
         assert_equal(len(json_obj['utxos']), 1)
-        assert_equal(json_obj['utxos'][0]['value'], 0.1)
+        assert_equal(json_obj['utxos'][0]['value'], Decimal('0.1'))
 
         self.log.info("Query a spent TXO using the /getutxos URI")
 
-        json_request = "/rest/getutxos/{}-0.json".format(vintx)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/{}-{}".format(*spent))
 
         # Check chainTip response
         assert_equal(json_obj['chaintipHash'], bb_hash)
 
-        # Make sure there is no utxo in the response because this oupoint has been spent
+        # Make sure there is no utxo in the response because this outpoint has been spent
         assert_equal(len(json_obj['utxos']), 0)
 
         # Check bitmap
         assert_equal(json_obj['bitmap'], "0")
 
         self.log.info("Query two TXOs using the /getutxos URI")
 
-        json_request = "/rest/getutxos/{}-{}/{}-0.json".format(txid, str(n), vintx)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/{}-{}/{}-{}".format(*(spending + spent)))
+
         assert_equal(len(json_obj['utxos']), 1)
         assert_equal(json_obj['bitmap'], "10")
 
@@ -124,12 +136,11 @@ def run_test(self):
         bb_hash = self.nodes[0].getbestblockhash()
 
         bin_request = b'\x01\x02'
-        bin_request += hex_str_to_bytes(txid)
-        bin_request += pack("i", n)
-        bin_request += hex_str_to_bytes(vintx)
-        bin_request += pack("i", 0)
+        for txid, n in [spending, spent]:
+            bin_request += hex_str_to_bytes(txid)
+            bin_request += pack("i", n)
 
-        bin_response = http_post_call(url.hostname, url.port, '/rest/getutxos.bin', bin_request)
+        bin_response = self.test_rest_request("/getutxos", http_method='POST', req_type=ReqType.BIN, body=bin_request, ret_type=RetType.BYTES)
         output = BytesIO()
         output.write(bin_response)
         output.seek(0)
@@ -146,115 +157,81 @@ def run_test(self):
 
         # do a tx and don't sync
         txid = self.nodes[0].sendtoaddress(self.nodes[1].getnewaddress(), 0.1)
-        json_request = "/rest/tx/{}.json".format(txid)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/tx/{}".format(txid))
         # get the spent output to later check for utxo (should be spent by then)
-        spent = '{}-{}'.format(json_obj['vin'][0]['txid'], json_obj['vin'][0]['vout'])
+        spent = (json_obj['vin'][0]['txid'], json_obj['vin'][0]['vout'])
         # get n of 0.1 outpoint
-        n = 0
-        for vout in json_obj['vout']:
-            if vout['value'] == 0.1:
-                n = vout['n']
-        spending = '{}-{}'.format(txid, n)
-
-        json_request = '/rest/getutxos/{}.json'.format(spending)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        n, = filter_output_indices_by_value(json_obj['vout'], Decimal('0.1'))
+        spending = (txid, n)
+
+        json_obj = self.test_rest_request("/getutxos/{}-{}".format(*spending))
         assert_equal(len(json_obj['utxos']), 0)
 
-        json_request = '/rest/getutxos/checkmempool/{}.json'.format(spending)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/checkmempool/{}-{}".format(*spending))
         assert_equal(len(json_obj['utxos']), 1)
 
-        json_request = '/rest/getutxos/{}.json'.format(spent)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/{}-{}".format(*spent))
         assert_equal(len(json_obj['utxos']), 1)
 
-        json_request = '/rest/getutxos/checkmempool/{}.json'.format(spent)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/checkmempool/{}-{}".format(*spent))
         assert_equal(len(json_obj['utxos']), 0)
 
         self.nodes[0].generate(1)
         self.sync_all()
 
-        json_request = '/rest/getutxos/{}.json'.format(spending)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/{}-{}".format(*spending))
         assert_equal(len(json_obj['utxos']), 1)
 
-        json_request = '/rest/getutxos/checkmempool/{}.json'.format(spending)
-        json_string = http_get_call(url.hostname, url.port, json_request)
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/getutxos/checkmempool/{}-{}".format(*spending))
         assert_equal(len(json_obj['utxos']), 1)
 
         # Do some invalid requests
-        json_request = '{"checkmempool'
-        response = http_post_call(url.hostname, url.port, '/rest/getutxos.json', json_request, True)
-        assert_equal(response.status, 400)  # must be a 400 because we send an invalid json request
-
-        json_request = '{"checkmempool'
-        response = http_post_call(url.hostname, url.port, '/rest/getutxos.bin', json_request, True)
-        assert_equal(response.status, 400)  # must be a 400 because we send an invalid bin request
-
-        response = http_post_call(url.hostname, url.port, '/rest/getutxos/checkmempool.json', '', True)
-        assert_equal(response.status, 400)  # must be a 400 because we send an invalid bin request
+        self.test_rest_request("/getutxos", http_method='POST', req_type=ReqType.JSON, body='{"checkmempool', status=400, ret_type=RetType.OBJ)
+        self.test_rest_request("/getutxos", http_method='POST', req_type=ReqType.BIN, body='{"checkmempool', status=400, ret_type=RetType.OBJ)
+        self.test_rest_request("/getutxos/checkmempool", http_method='POST', req_type=ReqType.JSON, status=400, ret_type=RetType.OBJ)
 
         # Test limits
-        json_request = '/rest/getutxos/checkmempool/' + '/'.join(["{}-{}".format(txid, n) for n in range(20)]) + '.json'
-        response = http_post_call(url.hostname, url.port, json_request, '', True)
-        assert_equal(response.status, 400)  # must be a 400 because we exceeding the limits
+        long_uri = '/'.join(["{}-{}".format(txid, n) for n in range(20)])
+        self.test_rest_request("/getutxos/checkmempool/{}".format(long_uri), http_method='POST', status=400, ret_type=RetType.OBJ)
 
-        json_request = '/rest/getutxos/checkmempool/' + '/'.join(['{}-{}'.format(txid, n) for n in range(15)]) + '.json'
-        response = http_post_call(url.hostname, url.port, json_request, '', True)
-        assert_equal(response.status, 200)  # must be a 200 because we are within the limits
+        long_uri = '/'.join(['{}-{}'.format(txid, n) for n in range(15)])
+        self.test_rest_request("/getutxos/checkmempool/{}".format(long_uri), http_method='POST', status=200)
 
         self.nodes[0].generate(1)  # generate block to not affect upcoming tests
         self.sync_all()
 
         self.log.info("Test the /block and /headers URIs")
 
         # Check binary format
-        response = http_get_call(url.hostname, url.port, '/rest/block/{}.bin'.format(bb_hash), True)
-        assert_equal(response.status, 200)
+        response = self.test_rest_request("/block/{}".format(bb_hash), req_type=ReqType.BIN, ret_type=RetType.OBJ)
         assert_greater_than(int(response.getheader('content-length')), 80)
         response_str = response.read()
 
         # Compare with block header
-        response_header = http_get_call(url.hostname, url.port, '/rest/headers/1/{}.bin'.format(bb_hash), True)
-        assert_equal(response_header.status, 200)
+        response_header = self.test_rest_request("/headers/1/{}".format(bb_hash), req_type=ReqType.BIN, ret_type=RetType.OBJ)
         assert_equal(int(response_header.getheader('content-length')), 80)
         response_header_str = response_header.read()
         assert_equal(response_str[0:80], response_header_str)
 
         # Check block hex format
-        response_hex = http_get_call(url.hostname, url.port, '/rest/block/{}.hex'.format(bb_hash), True)
-        assert_equal(response_hex.status, 200)
+        response_hex = self.test_rest_request("/block/{}".format(bb_hash), req_type=ReqType.HEX, ret_type=RetType.OBJ)
         assert_greater_than(int(response_hex.getheader('content-length')), 160)
         response_hex_str = response_hex.read()
         assert_equal(encode(response_str, "hex_codec")[0:160], response_hex_str[0:160])
 
         # Compare with hex block header
-        response_header_hex = http_get_call(url.hostname, url.port, '/rest/headers/1/{}.hex'.format(bb_hash), True)
-        assert_equal(response_header_hex.status, 200)
+        response_header_hex = self.test_rest_request("/headers/1/{}".format(bb_hash), req_type=ReqType.HEX, ret_type=RetType.OBJ)
         assert_greater_than(int(response_header_hex.getheader('content-length')), 160)
         response_header_hex_str = response_header_hex.read()
         assert_equal(response_hex_str[0:160], response_header_hex_str[0:160])
         assert_equal(encode(response_header_str, "hex_codec")[0:160], response_header_hex_str[0:160])
 
         # Check json format
-        block_json_string = http_get_call(url.hostname, url.port, '/rest/block/{}.json'.format(bb_hash))
-        block_json_obj = json.loads(block_json_string)
+        block_json_obj = self.test_rest_request("/block/{}".format(bb_hash))
         assert_equal(block_json_obj['hash'], bb_hash)
 
         # Compare with json block header
-        response_header_json = http_get_call(url.hostname, url.port, '/rest/headers/1/{}.json'.format(bb_hash), True)
-        assert_equal(response_header_json.status, 200)
-        response_header_json_str = response_header_json.read().decode('utf-8')
-        json_obj = json.loads(response_header_json_str, parse_float=Decimal)
+        json_obj = self.test_rest_request("/headers/1/{}".format(bb_hash))
         assert_equal(len(json_obj), 1)  # ensure that there is one header in the json response
         assert_equal(json_obj[0]['hash'], bb_hash)  # request/response hash should be the same
 
@@ -266,23 +243,18 @@ def run_test(self):
         # See if we can get 5 headers in one response
         self.nodes[1].generate(5)
         self.sync_all()
-        response_header_json = http_get_call(url.hostname, url.port, '/rest/headers/5/{}.json'.format(bb_hash), True)
-        assert_equal(response_header_json.status, 200)
-        response_header_json_str = response_header_json.read().decode('utf-8')
-        json_obj = json.loads(response_header_json_str)
+        json_obj = self.test_rest_request("/headers/5/{}".format(bb_hash))
         assert_equal(len(json_obj), 5)  # now we should have 5 header objects
 
         self.log.info("Test the /tx URI")
 
         tx_hash = block_json_obj['tx'][0]['txid']
-        json_string = http_get_call(url.hostname, url.port, '/rest/tx/{}.json'.format(tx_hash))
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/tx/{}".format(tx_hash))
         assert_equal(json_obj['txid'], tx_hash)
 
         # Check hex format response
-        hex_string = http_get_call(url.hostname, url.port, '/rest/tx/{}.hex'.format(tx_hash), True)
-        assert_equal(hex_string.status, 200)
-        assert_greater_than(int(response.getheader('content-length')), 10)
+        hex_response = self.test_rest_request("/tx/{}".format(tx_hash), req_type=ReqType.HEX, ret_type=RetType.OBJ)
+        assert_greater_than(int(hex_response.getheader('content-length')), 10)
 
         self.log.info("Test tx inclusion in the /mempool and /block URIs")
 
@@ -294,17 +266,15 @@ def run_test(self):
         self.sync_all()
 
         # Check that there are exactly 3 transactions in the TX memory pool before generating the block
-        json_string = http_get_call(url.hostname, url.port, '/rest/mempool/info.json')
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/mempool/info")
         assert_equal(json_obj['size'], 3)
         # the size of the memory pool should be greater than 3x ~100 bytes
         assert_greater_than(json_obj['bytes'], 300)
 
         # Check that there are our submitted transactions in the TX memory pool
-        json_string = http_get_call(url.hostname, url.port, '/rest/mempool/contents.json')
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/mempool/contents")
         for i, tx in enumerate(txs):
-            assert_equal(tx in json_obj, True)
+            assert tx in json_obj
             assert_equal(json_obj[tx]['spentby'], txs[i + 1:i + 2])
             assert_equal(json_obj[tx]['depends'], txs[i - 1:i])
 
@@ -313,24 +283,21 @@ def run_test(self):
         self.sync_all()
 
         # Check if the 3 tx show up in the new block
-        json_string = http_get_call(url.hostname, url.port, '/rest/block/{}.json'.format(newblockhash[0]))
-        json_obj = json.loads(json_string)
-        for tx in json_obj['tx']:
-            if 'coinbase' not in tx['vin'][0]:  # exclude coinbase
-                assert_equal(tx['txid'] in txs, True)
+        json_obj = self.test_rest_request("/block/{}".format(newblockhash[0]))
+        non_coinbase_txs = {tx['txid'] for tx in json_obj['tx']
+                            if 'coinbase' not in tx['vin'][0]}
+        assert_equal(non_coinbase_txs, set(txs))
 
         # Check the same but without tx details
-        json_string = http_get_call(url.hostname, url.port, '/rest/block/notxdetails/{}.json'.format(newblockhash[0]))
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/block/notxdetails/{}".format(newblockhash[0]))
         for tx in txs:
-            assert_equal(tx in json_obj['tx'], True)
+            assert tx in json_obj['tx']
 
         self.log.info("Test the /chaininfo URI")
 
         bb_hash = self.nodes[0].getbestblockhash()
 
-        json_string = http_get_call(url.hostname, url.port, '/rest/chaininfo.json')
-        json_obj = json.loads(json_string)
+        json_obj = self.test_rest_request("/chaininfo")
         assert_equal(json_obj['bestblockhash'], bb_hash)
 
 if __name__ == '__main__':