add utility methods from blockstack_client, like serializing an atlas zone file inventory message to a string and parsing host:port strings. This cuts dependency on blockstack_client

blockstack/lib/util.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+"""
+    Blockstack
+    ~~~~~
+    copyright: (c) 2014-2015 by Halfmoon Labs, Inc.
+    copyright: (c) 2016-2018 by Blockstack.org
+
+    This file is part of Blockstack
+
+    Blockstack is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Blockstack is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    You should have received a copy of the GNU General Public License
+    along with Blockstack. If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import json
+import sys
+import os
+import urllib2
+import hashlib
+import threading
+import traceback
+import gc
+import time
+from .config import RPC_SERVER_PORT
+
+def url_to_host_port(url, port=None):
+    """
+    Given a URL, turn it into (host, port) for a blockstack server.
+    Return (None, None) on invalid URL
+    """
+    if not url.startswith('http://') or not url.startswith('https://'):
+        url = 'http://' + url
+
+    if not port:
+        port = RPC_SERVER_PORT
+
+    urlinfo = urllib2.urlparse.urlparse(url)
+    hostport = urlinfo.netloc
+
+    parts = hostport.split('@')
+    if len(parts) > 2:
+        return None, None
+
+    if len(parts) == 2:
+        hostport = parts[1]
+
+    parts = hostport.split(':')
+    if len(parts) > 2:
+        return None, None
+
+    if len(parts) == 2:
+        try:
+            port = int(parts[1])
+            assert 0 < port < 65535, 'Invalid port'
+        except TypeError:
+            return None, None
+
+    return parts[0], port
+
+
+def atlas_inventory_to_string( inv ):
+    """
+    Inventory to string (bitwise big-endian)
+    """
+    ret = ""
+    for i in range(0, len(inv)):
+        for j in range(0, 8):
+            bit_index = 1 << (7 - j)
+            val = (ord(inv[i]) & bit_index)
+            if val != 0:
+                ret += "1"
+            else:
+                ret += "0"
+
+    return ret