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from urlparse import urlparse
from .client import Redis
DEFAULT_DATABASE_ID = 0
def from_url(url, db=None):
"""Returns an active Redis client generated from the given database URL.
Will attempt to extract the database id from the path url fragment, if
none is provided.
"""
url = urlparse(url)
# Make sure it's a redis database.
if url.scheme:
assert url.scheme == 'redis'
# Attempt to resolve database id.
if db is None:
try:
db = int(url.path.replace('/', ''))
except (AttributeError, ValueError):
db = DEFAULT_DATABASE_ID
return Redis(
host=url.hostname,
port=url.port,
db=db,
password=url.password)
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