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"""Universal(ly) Unique Identifiers (UUIDs).
"""
import commands
import random
def uuidgen(random=True):
"""Generate a UUID using the command uuidgen.
If random is true (default) generates a random uuid.
If random is false generates a time-based uuid.
"""
cmd = "uuidgen"
if random:
cmd += " -r"
else:
cmd += " -t"
return commands.getoutput(cmd)
class UuidFactoryUuidgen:
"""A uuid factory using uuidgen."""
def __init__(self):
pass
def getUuid(self):
return uuidgen()
class UuidFactoryRandom:
"""A random uuid factory."""
def __init__(self):
f = file("/dev/urandom", "r")
seed = f.read(16)
f.close()
self.rand = random.Random(seed)
def randBytes(self, n):
return [ self.rand.randint(0, 255) for i in range(0, n) ]
def getUuid(self):
bytes = self.randBytes(16)
# Encode the variant.
bytes[6] = (bytes[6] & 0x0f) | 0x40
bytes[8] = (bytes[8] & 0x3f) | 0x80
f = "%02x"
return ( "-".join([f*4, f*2, f*2, f*2, f*6]) % tuple(bytes) )
def getFactory():
"""Get the factory to use for creating uuids.
This is so it's easy to change the uuid factory.
For example, for testing we might want repeatable uuids
rather than the random ones we normally use.
"""
global uuidFactory
try:
uuidFactory
except:
#uuidFactory = UuidFactoryUuidgen()
uuidFactory = UuidFactoryRandom()
return uuidFactory
def getUuid():
return getFactory().getUuid()
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