from __future__ import division
+import itertools
import random
+import sys
from twisted.internet import defer, reactor
from twisted.python import failure, log
def sleep(t):
- d = defer.Deferred()
- reactor.callLater(t, d.callback, None)
+ d = defer.Deferred(canceller=lambda d_: dc.cancel())
+ dc = reactor.callLater(t, d.callback, None)
return d
-def retry(message, delay):
+def run_repeatedly(f, *args, **kwargs):
+ current_dc = [None]
+ def step():
+ delay = f(*args, **kwargs)
+ current_dc[0] = reactor.callLater(delay, step)
+ step()
+ def stop():
+ current_dc[0].cancel()
+ return stop
+
+class RetrySilentlyException(Exception):
+ pass
+
+def retry(message='Error:', delay=3, max_retries=None, traceback=True):
'''
@retry('Error getting block:', 1)
@defer.inlineCallbacks
def retry2(func):
@defer.inlineCallbacks
def f(*args, **kwargs):
- while True:
+ for i in itertools.count():
try:
result = yield func(*args, **kwargs)
- except:
- print
- print message
- log.err()
- print
-
+ except Exception, e:
+ if i == max_retries:
+ raise
+ if not isinstance(e, RetrySilentlyException):
+ if traceback:
+ log.err(None, message)
+ else:
+ print >>sys.stderr, message, e
yield sleep(delay)
else:
defer.returnValue(result)
self.map = {}
def __call__(self, id):
- self.func(id)
- uniq = random.randrange(2**256)
+ if id not in self.map:
+ self.func(id)
df = defer.Deferred()
def timeout():
- df, timer = self.map[id].pop(uniq)
- df.errback(failure.Failure(defer.TimeoutError()))
+ self.map[id].remove((df, timer))
if not self.map[id]:
del self.map[id]
- self.map.setdefault(id, {})[uniq] = (df, reactor.callLater(self.timeout, timeout))
+ df.errback(failure.Failure(defer.TimeoutError('in ReplyMatcher')))
+ timer = reactor.callLater(self.timeout, timeout)
+ self.map.setdefault(id, set()).add((df, timer))
return df
def got_response(self, id, resp):
if id not in self.map:
return
- for df, timer in self.map.pop(id).itervalues():
- timer.cancel()
+ for df, timer in self.map.pop(id):
df.callback(resp)
+ timer.cancel()
class GenericDeferrer(object):
'''
Converts query with identifier/got response interface to deferred interface
'''
- def __init__(self, max_id, func, timeout=5):
+ def __init__(self, max_id, func, timeout=5, on_timeout=lambda: None):
self.max_id = max_id
self.func = func
self.timeout = timeout
+ self.on_timeout = on_timeout
self.map = {}
def __call__(self, *args, **kwargs):
id = random.randrange(self.max_id)
if id not in self.map:
break
- df = defer.Deferred()
+ def cancel(df):
+ df, timer = self.map.pop(id)
+ timer.cancel()
+ try:
+ df = defer.Deferred(cancel)
+ except TypeError:
+ df = defer.Deferred() # handle older versions of Twisted
def timeout():
self.map.pop(id)
- df.errback(failure.Failure(defer.TimeoutError()))
+ df.errback(failure.Failure(defer.TimeoutError('in GenericDeferrer')))
+ self.on_timeout()
timer = reactor.callLater(self.timeout, timeout)
- self.func(id, *args, **kwargs)
self.map[id] = df, timer
+ self.func(id, *args, **kwargs)
return df
def got_response(self, id, resp):
df, timer = self.map.pop(id)
timer.cancel()
df.callback(resp)
+
+ def respond_all(self, resp):
+ while self.map:
+ id, (df, timer) = self.map.popitem()
+ timer.cancel()
+ df.errback(resp)
class NotNowError(Exception):
pass
self.backing[key] = value
defer.returnValue(value)
- def call_now(self, key):
- if key in self.waiting:
- raise NotNowError()
-
+ _nothing = object()
+ def call_now(self, key, default=_nothing):
if key in self.backing:
return self.backing[key]
- else:
+ if key not in self.waiting:
self.waiting[key] = defer.Deferred()
def cb(value):
self.backing[key] = value
self.waiting.pop(key).callback(None)
def eb(fail):
self.waiting.pop(key).callback(None)
+ if fail.check(RetrySilentlyException):
+ return
print
print 'Error when requesting noncached value:'
fail.printTraceback()
print
self.func(key).addCallback(cb).addErrback(eb)
- raise NotNowError()
+ if default is not self._nothing:
+ return default
+ raise NotNowError(key)
+
+def deferred_has_been_called(df):
+ still_running = True
+ res2 = []
+ def cb(res):
+ if still_running:
+ res2[:] = [res]
+ else:
+ return res
+ df.addBoth(cb)
+ still_running = False
+ if res2:
+ return True, res2[0]
+ return False, None
+def inlineCallbacks(f):
+ from functools import wraps
+ @wraps(f)
+ def _(*args, **kwargs):
+ gen = f(*args, **kwargs)
+ stop_running = [False]
+ def cancelled(df_):
+ assert df_ is df
+ stop_running[0] = True
+ if currently_waiting_on:
+ currently_waiting_on[0].cancel()
+ df = defer.Deferred(cancelled)
+ currently_waiting_on = []
+ def it(cur):
+ while True:
+ try:
+ if isinstance(cur, failure.Failure):
+ res = cur.throwExceptionIntoGenerator(gen) # external code is run here
+ else:
+ res = gen.send(cur) # external code is run here
+ if stop_running[0]:
+ return
+ except StopIteration:
+ df.callback(None)
+ except defer._DefGen_Return as e:
+ # XXX should make sure direct child threw
+ df.callback(e.value)
+ except:
+ df.errback()
+ else:
+ if isinstance(res, defer.Deferred):
+ called, res2 = deferred_has_been_called(res)
+ if called:
+ cur = res2
+ continue
+ else:
+ currently_waiting_on[:] = [res]
+ def gotResult(res2):
+ assert currently_waiting_on[0] is res
+ currently_waiting_on[:] = []
+ if stop_running[0]:
+ return
+ it(res2)
+ res.addBoth(gotResult) # external code is run between this and gotResult
+ else:
+ cur = res
+ continue
+ break
+ it(None)
+ return df
+ return _
+
+
+
+class RobustLoopingCall(object):
+ def __init__(self, func, *args, **kwargs):
+ self.func, self.args, self.kwargs = func, args, kwargs
+
+ self.running = False
+
+ def start(self, period):
+ assert not self.running
+ self.running = True
+ self._df = self._worker(period).addErrback(lambda fail: fail.trap(defer.CancelledError))
+
+ @inlineCallbacks
+ def _worker(self, period):
+ assert self.running
+ while self.running:
+ try:
+ self.func(*self.args, **self.kwargs)
+ except:
+ log.err()
+ yield sleep(period)
+
+ def stop(self):
+ assert self.running
+ self.running = False
+ self._df.cancel()
+ return self._df
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