lib/util.py

   1 import os, sys, re, json
   2 import platform
   3 import shutil
   4 from datetime import datetime
   5 is_verbose = False
   6
   7
   8 class MyEncoder(json.JSONEncoder):
   9     def default(self, obj):
  10         from transaction import Transaction
  11         if isinstance(obj, Transaction):
  12             return obj.as_dict()
  13         return super(MyEncoder, self).default(obj)
  14
  15
  16 def set_verbosity(b):
  17     global is_verbose
  18     is_verbose = b
  19
  20
  21 def print_error(*args):
  22     if not is_verbose: return
  23     print_stderr(*args)
  24
  25 def print_stderr(*args):
  26     args = [str(item) for item in args]
  27     sys.stderr.write(" ".join(args) + "\n")
  28     sys.stderr.flush()
  29
  30 def print_msg(*args):
  31     # Stringify args
  32     args = [str(item) for item in args]
  33     sys.stdout.write(" ".join(args) + "\n")
  34     sys.stdout.flush()
  35
  36 def print_json(obj):
  37     try:
  38         s = json.dumps(obj, sort_keys = True, indent = 4, cls=MyEncoder)
  39     except TypeError:
  40         s = repr(obj)
  41     sys.stdout.write(s + "\n")
  42     sys.stdout.flush()
  43
  44 def user_dir():
  45     if "HOME" in os.environ:
  46         return os.path.join(os.environ["HOME"], ".electrum")
  47     elif "APPDATA" in os.environ:
  48         return os.path.join(os.environ["APPDATA"], "Electrum")
  49     elif "LOCALAPPDATA" in os.environ:
  50         return os.path.join(os.environ["LOCALAPPDATA"], "Electrum")
  51     elif 'ANDROID_DATA' in os.environ:
  52         return "/sdcard/electrum/"
  53     else:
  54         #raise Exception("No home directory found in environment variables.")
  55         return
  56
  57 def appdata_dir():
  58     """Find the path to the application data directory; add an electrum folder and return path."""
  59     if platform.system() == "Windows":
  60         return os.path.join(os.environ["APPDATA"], "Electrum")
  61     elif platform.system() == "Linux":
  62         return os.path.join(sys.prefix, "share", "electrum")
  63     elif (platform.system() == "Darwin" or
  64           platform.system() == "DragonFly" or
  65           platform.system() == "OpenBSD" or
  66           platform.system() == "FreeBSD" or
  67           platform.system() == "NetBSD"):
  68         return "/Library/Application Support/Electrum"
  69     else:
  70         raise Exception("Unknown system")
  71
  72
  73 def get_resource_path(*args):
  74     return os.path.join(".", *args)
  75
  76
  77 def local_data_dir():
  78     """Return path to the data folder."""
  79     assert sys.argv
  80     prefix_path = os.path.dirname(sys.argv[0])
  81     local_data = os.path.join(prefix_path, "data")
  82     return local_data
  83
  84
  85 def format_satoshis(x, is_diff=False, num_zeros = 0, decimal_point = 8, whitespaces=False):
  86     from decimal import Decimal
  87     s = Decimal(x)
  88     sign, digits, exp = s.as_tuple()
  89     digits = map(str, digits)
  90     while len(digits) < decimal_point + 1:
  91         digits.insert(0,'0')
  92     digits.insert(-decimal_point,'.')
  93     s = ''.join(digits).rstrip('0')
  94     if sign:
  95         s = '-' + s
  96     elif is_diff:
  97         s = "+" + s
  98
  99     p = s.find('.')
 100     s += "0"*( 1 + num_zeros - ( len(s) - p ))
 101     if whitespaces:
 102         s += " "*( 1 + decimal_point - ( len(s) - p ))
 103         s = " "*( 13 - decimal_point - ( p )) + s
 104     return s
 105
 106
 107 # Takes a timestamp and returns a string with the approximation of the age
 108 def age(from_date, since_date = None, target_tz=None, include_seconds=False):
 109     if from_date is None:
 110         return "Unknown"
 111
 112     from_date = datetime.fromtimestamp(from_date)
 113     if since_date is None:
 114         since_date = datetime.now(target_tz)
 115
 116     distance_in_time = since_date - from_date
 117     distance_in_seconds = int(round(abs(distance_in_time.days * 86400 + distance_in_time.seconds)))
 118     distance_in_minutes = int(round(distance_in_seconds/60))
 119
 120     if distance_in_minutes <= 1:
 121         if include_seconds:
 122             for remainder in [5, 10, 20]:
 123                 if distance_in_seconds < remainder:
 124                     return "less than %s seconds ago" % remainder
 125             if distance_in_seconds < 40:
 126                 return "half a minute ago"
 127             elif distance_in_seconds < 60:
 128                 return "less than a minute ago"
 129             else:
 130                 return "1 minute ago"
 131         else:
 132             if distance_in_minutes == 0:
 133                 return "less than a minute ago"
 134             else:
 135                 return "1 minute ago"
 136     elif distance_in_minutes < 45:
 137         return "%s minutes ago" % distance_in_minutes
 138     elif distance_in_minutes < 90:
 139         return "about 1 hour ago"
 140     elif distance_in_minutes < 1440:
 141         return "about %d hours ago" % (round(distance_in_minutes / 60.0))
 142     elif distance_in_minutes < 2880:
 143         return "1 day ago"
 144     elif distance_in_minutes < 43220:
 145         return "%d days ago" % (round(distance_in_minutes / 1440))
 146     elif distance_in_minutes < 86400:
 147         return "about 1 month ago"
 148     elif distance_in_minutes < 525600:
 149         return "%d months ago" % (round(distance_in_minutes / 43200))
 150     elif distance_in_minutes < 1051200:
 151         return "about 1 year ago"
 152     else:
 153         return "over %d years ago" % (round(distance_in_minutes / 525600))
 154
 155
 156 # URL decode
 157 #_ud = re.compile('%([0-9a-hA-H]{2})', re.MULTILINE)
 158 #urldecode = lambda x: _ud.sub(lambda m: chr(int(m.group(1), 16)), x)
 159
 160 def parse_URI(uri):
 161     import urlparse
 162     import bitcoin
 163     from decimal import Decimal
 164
 165     if ':' not in uri:
 166         assert bitcoin.is_address(uri)
 167         return uri, None, None, None, None
 168
 169     u = urlparse.urlparse(uri)
 170     assert u.scheme == 'bitcoin'
 171
 172     address = u.path
 173     assert bitcoin.is_address(address)
 174
 175     pq = urlparse.parse_qs(u.query)
 176
 177     for k, v in pq.items():
 178         if len(v)!=1:
 179             raise Exception('Duplicate Key', k)
 180
 181     amount = label = message = request_url = ''
 182     if 'amount' in pq:
 183         am = pq['amount'][0]
 184         m = re.match('([0-9\.]+)X([0-9])', am)
 185         if m:
 186             k = int(m.group(2)) - 8
 187             amount = Decimal(m.group(1)) * pow(  Decimal(10) , k)
 188         else:
 189             amount = Decimal(am) * 100000000
 190     if 'message' in pq:
 191         message = pq['message'][0]
 192     if 'label' in pq:
 193         label = pq['label'][0]
 194     if 'r' in pq:
 195         request_url = pq['r'][0]
 196
 197     return address, amount, label, message, request_url
 198
 199
 200 # Python bug (http://bugs.python.org/issue1927) causes raw_input
 201 # to be redirected improperly between stdin/stderr on Unix systems
 202 def raw_input(prompt=None):
 203     if prompt:
 204         sys.stdout.write(prompt)
 205     return builtin_raw_input()
 206 import __builtin__
 207 builtin_raw_input = __builtin__.raw_input
 208 __builtin__.raw_input = raw_input