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# coding: utf-8
# This file is a part of VK4XMPP transport
# © simpleApps, 2014.
"""
Contains useful functions which used across the modules
"""
import threading
import xmpp
import urllib
from socket import error
from writer import *
isNumber = lambda obj: (not execute(int, (obj,), False) is None)
def execute(handler, list=(), log=True):
"""
Just executes handler(*list) safely
Writes a crashlog if errors occurred
"""
try:
result = handler(*list)
except (SystemExit, xmpp.NodeProcessed):
result = True
except Exception:
result = None
if log:
crashLog(handler.func_name)
logger.error("Exception happened during executing function: %s%s" % (handler.func_name, str(list)))
return result
def runThread(func, args=(), name=None, delay=0):
"""
Runs a thread with custom args and name
Needed to reduce code
Parameters:
func: function you need to be running in a thread
args: function arguments
name: thread name
att: number of attempts
delay: if set, then threading.Timer will be started, not threading.Thread
"""
if delay:
logger.debug("threading: starting timer for %s%s, "
"name:%s, delay:%s" % (func.func_name, str(args), name, delay))
thr = threading.Timer(delay, execute, (func, args))
else:
thr = threading.Thread(target=execute, args=(func, args))
thr.name = str(name or func.__name__) + "-" + str(time.time())
thr.start()
return thr
def safe(func):
"""
Executes func(*args) safely
"""
def wrapper(*args):
try:
func(*args)
except xmpp.NodeProcessed:
pass
except Exception:
crashLog(func.func_name)
wrapper.__name__ = func.__name__
return wrapper
def cache(func):
"""
Caches user/group ids for future usage
"""
def wrapper(self, uid, fields=None):
fields = fields or []
fieldsStr = ",".join(fields)
if uid in self.cache:
if self.cache[uid]["fields"] == fieldsStr:
return self.cache[uid]
result = func(self, uid, fields)
if result:
result["fields"] = fieldsStr
if "user_id" in result:
del result["user_id"]
if uid in self.cache:
self.cache[uid].update(result)
else:
self.cache[uid] = result
return result
wrapper.__name__ = func.__name__
return wrapper
def threaded(func):
"""
Another decorator.
Executes a function in a thread
"""
def wrapper(*args):
runThread(func, args)
wrapper.__name__ = "threaded_%s" % func.__name__
return wrapper
def buildDataForm(form=None, type="form", fields=[], title=None, data=[]):
"""
Provides easier method to build data forms using dict for each form object
Parameters:
form: xmpp.DataForm object
type: form type
fields: list of form objects represented as dict, e.g.
[{"var": "cool", "type": "text-single",
"desc": "my cool description", "value": "cool"}]
title: form title
data: advanced data for form. e.g.
instructions (if string in the list), look at xmpp/protocol.py:1326
"""
if title and form:
form.setTitle(title)
form = form or xmpp.DataForm(type, data, title)
for key in fields:
field = form.setField(key["var"], key.get("value"),
key.get("type"), key.get("desc"), key.get("options"))
if key.get("payload"):
field.setPayload(key["payload"])
if key.get("label"):
field.setLabel(key["label"])
if key.get("requred"):
field.setRequired()
return form
def buildIQError(stanza, error=xmpp.ERR_FEATURE_NOT_IMPLEMENTED, text=None):
"""
Provides a way to build IQ error reply
"""
error = xmpp.Error(stanza, error, True)
if text:
tag = error.getTag("error")
if tag:
tag.setTagData("text", text)
return error
def normalizeValue(value):
"""
Normalizes boolean values from dataform replies
"""
if isNumber(value):
value = int(value)
elif value and value.lower() == "true":
value = 1
else:
value = 0
return value
def getLinkData(url, encode=True):
"""
Gets link data and ignores any exceptions
Parameters:
encode: base64 data encode
"""
try:
opener = urllib.urlopen(url)
data = opener.read()
except (Exception, error):
return ""
if data and encode:
data = data.encode("base64")
return data
TIME_VALUES = {"s": 60, "m": 360, "d": 86400, "M": 2592000, "y": 31536000}
def TimeMachine(text):
"""
TARDIS Prototype
"""
time = 0
for i in xrange(0, len(text) - 1, 3):
current = text[i:i + 3]
x = current[-1]
if x in TIME_VALUES:
time += int(current[:-1]) * TIME_VALUES[x]
return time
# Yay!
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