117 lines
2.9 KiB
Python
117 lines
2.9 KiB
Python
from collections import defaultdict
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import struct
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from threading import Thread, Event
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from kafka.common import BufferUnderflowError
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def write_int_string(s):
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if s is None:
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return struct.pack('>i', -1)
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else:
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return struct.pack('>i%ds' % len(s), len(s), s)
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def write_short_string(s):
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if s is None:
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return struct.pack('>h', -1)
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else:
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return struct.pack('>h%ds' % len(s), len(s), s)
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def read_short_string(data, cur):
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if len(data) < cur + 2:
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raise BufferUnderflowError("Not enough data left")
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(strlen,) = struct.unpack('>h', data[cur:cur + 2])
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if strlen == -1:
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return None, cur + 2
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cur += 2
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if len(data) < cur + strlen:
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raise BufferUnderflowError("Not enough data left")
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out = data[cur:cur + strlen]
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return out, cur + strlen
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def read_int_string(data, cur):
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if len(data) < cur + 4:
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raise BufferUnderflowError(
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"Not enough data left to read string len (%d < %d)" %
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(len(data), cur + 4))
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(strlen,) = struct.unpack('>i', data[cur:cur + 4])
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if strlen == -1:
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return None, cur + 4
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cur += 4
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if len(data) < cur + strlen:
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raise BufferUnderflowError("Not enough data left")
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out = data[cur:cur + strlen]
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return out, cur + strlen
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def relative_unpack(fmt, data, cur):
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size = struct.calcsize(fmt)
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if len(data) < cur + size:
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raise BufferUnderflowError("Not enough data left")
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out = struct.unpack(fmt, data[cur:cur + size])
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return out, cur + size
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def group_by_topic_and_partition(tuples):
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out = defaultdict(dict)
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for t in tuples:
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out[t.topic][t.partition] = t
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return out
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class ReentrantTimer(object):
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"""
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A timer that can be restarted, unlike threading.Timer
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(although this uses threading.Timer)
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t: timer interval in milliseconds
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fn: a callable to invoke
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args: tuple of args to be passed to function
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kwargs: keyword arguments to be passed to function
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"""
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def __init__(self, t, fn, *args, **kwargs):
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if t <= 0:
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raise ValueError('Invalid timeout value')
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if not callable(fn):
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raise ValueError('fn must be callable')
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self.thread = None
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self.t = t / 1000.0
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self.fn = fn
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self.args = args
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self.kwargs = kwargs
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self.active = None
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def _timer(self, active):
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while not active.wait(self.t):
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self.fn(*self.args, **self.kwargs)
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def start(self):
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if self.thread is not None:
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self.stop()
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self.active = Event()
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self.thread = Thread(target=self._timer, args=(self.active,))
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self.thread.daemon = True # So the app exits when main thread exits
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self.thread.start()
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def stop(self):
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if self.thread is None:
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return
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self.active.set()
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self.thread.join(self.t + 1)
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self.timer = None
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