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greenlet.py
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greenlet.py
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from __future__ import absolute_import
import gc
import traceback
try:
from eventlet import sleep
except ImportError:
def sleep():
raise NotImplementedError('Eventlet not found')
import greenlet
__all__ = (
'get_greenlet_stack_trace', 'get_all_greenlets', 'get_process_debug_info', 'cooperative_iter',
)
def get_greenlet_stack_trace(g):
'''
Gets formatted stack trace for greenlet g;
:type g: greenlet.greenlet
:rtype: unicode
'''
stack = traceback.format_stack(g.gr_frame)
return ''.join(stack)
def get_all_greenlets():
'''
Gets all allocated greenlets.
:rtype: set of greenlet.greenlet
'''
return set(obj for obj in gc.get_objects() if isinstance(obj, greenlet.greenlet))
def get_process_debug_info():
'''
Gets some process debug information.
:rtype: iterable of debug messages
'''
current = greenlet.getcurrent()
greenlets = get_all_greenlets()
messages = [
"Current greenlet is %s. Stack trace:\n%s" % (current, get_greenlet_stack_trace(current),),
"Number of greenlets: %d\n" % (len(greenlets),),
]
messages.extend('Greenlet %s stack trace:\n%s' % (g, get_greenlet_stack_trace(g))
for g in greenlets if g is not current)
return messages
def cooperative_iter(iterable, chunk_size=1, interval=0):
"""
Returns an iterator which wraps `iterable` and sleeps `interval` every `chunk_size`
elements. This makes iterating `iterable` more green and can prevent starving other
greenlets/greenthreads.
:type iterable: iterable
:type chunk_size: int
:type interval: float
"""
for index, element in enumerate(iterable):
yield element
if index % chunk_size == 0:
sleep(interval)
def cooperative_yield(secs=0):
"""Yield to Eventlet hub for `secs` seconds.
This is equivalent to calling eventlet.sleep(secs) but better express the semantics.
"""
sleep(secs)