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import random
class RandomHostIterator:
""" An iterator that returns a randomly selected host. A host is
guaranteed to not be selected twice unless there is only one
host in the collection.
"""
def __init__(self, hosts):
self.last = 0
self.hosts = hosts
def __iter__(self):
hostslist = self.hosts[:]
random.shuffle(hostslist)
for host in hostslist:
yield host
def __len__(self):
return len(self.hosts)
def collect_hosts(hosts):
""" Collect a set of hosts and an optional chroot from a string.
"""
host_ports, chroot = hosts.partition("/")[::2]
chroot = "/" + chroot if chroot else None
result = []
for host_port in host_ports.split(","):
host, port = host_port.partition(":")[::2]
port = int(port.strip()) if port else 2181
result.append((host.strip(), port))
return (RandomHostIterator(result), chroot)
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