46 lines
1.2 KiB
Python
46 lines
1.2 KiB
Python
"""Spawn multiple greenlet-workers and collect their results.
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Demonstrates how to use coros.Job.
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"""
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import sys
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import string
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from eventlet.api import sleep
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from eventlet.green import socket
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from eventlet.coros import Job
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# this example works with both standard eventlet hubs and with twisted-based hub
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# comment out the following line to use standard eventlet hub
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from twisted.internet import reactor
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def geturl(url):
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c = socket.socket()
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ip = socket.gethostbyname(url)
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c.connect((ip, 80))
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c.send('GET /\r\n\r\n')
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return c.recv(1024)
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def progress_indicator():
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while True:
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sys.stderr.write('.')
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sleep(0.5)
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Job(progress_indicator)
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urls = ['www.%s.com' % (x*3) for x in string.letters]
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jobs = [Job(geturl, x) for x in urls]
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print 'spawned %s jobs' % len(jobs)
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# collect the results from workers, one by one
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for url, job in zip(urls, jobs):
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sys.stderr.write('%s: ' % url)
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try:
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result = job.wait()
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except Exception, ex: # when using BaseException here and pressing Ctrl-C recv returns None sometimes
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sys.stderr.write('%s' % ex)
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else:
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sys.stderr.write('%s bytes: %s...' % (len(result), repr(result)[:40]))
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finally:
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sys.stderr.write('\n')
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