yarns/lib.py


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import errno
import os
import time
import yaml

import cliapp
from yarnutils import *

import distixapi

datadir = os.environ['DATADIR']
srcdir = os.environ['SRCDIR']


vars = Variables(datadir)


MAX_CAT_TIME = 5 # seconds
def cat(filename):
    start = time.time()
    while time.time() - start < MAX_CAT_TIME:
        try:
            with open(filename) as f:
                data = f.read()
                if len(data) == 0:
                    continue
                return data
        except (IOError, OSError) as e:
            if e.errno == errno.ENOENT:
                continue
            raise
    raise Exception("cat took more then %s seconds" % MAX_CAT_TIME)


def load_users():
    if os.path.exists('users.yaml'):
        with open('users.yaml') as f:
            return yaml.safe_load(f)
    return {'users': {}}


def save_users(users):
    print 'saving', repr(users)
    with open('users.yaml', 'w') as f:
        yaml.safe_dump(users, stream=f)