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import errno
import json
import os
import StringIO
import time

import cliapp
import requests
import yaml
import yarnutils


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

vars = yarnutils.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 write(filename, content):
    with open(filename, 'w') as f:
        f.write(content)


def git(repo, *argv):
    return cliapp.runcmd(['git'] + list(argv), cwd=repo)


def controller_url(port, path):
    return 'http://localhost:{}{}'.format(port, path)


def request(method, url, body=None):
    funcs = {
        'POST': requests.post,
        'PUT': requests.put,
        'GET': requests.get,
        'DELETE': requests.delete,
    }

    headers = {
        'Content-Type': 'application/json',
    }

    response = funcs[method](
        url,
        headers=headers,
        data=body,
    )

    return response.status_code, response.text


def parse_json(text):
    return json.loads(text)


def parse_yaml(text):
    f = StringIO.StringIO(text)
    return yaml.safe_load(stream=f)


def unescape(text):
    def helper(text):
        while text:
            if text.startswith('\\n'):
                skip = 2
                answer = '\n'
            else:
                skip = 1
                answer = text[0]
            text = text[skip:]
            yield answer
    return ''.join(helper(text))