larigira/larigira/config.py

#!/usr/bin/env python
"""
Taken from flask-appconfig
"""

import json
import os

from xdg import BaseDirectory


def get_conf(prefix="LARIGIRA_"):
    """This is where everyone should get configuration from"""
    conf_dir = BaseDirectory.save_config_path("larigira")
    conf = {}
    conf["CONTINOUS_AUDIOSPEC"] = dict(kind="mpd", howmany=1)
    conf["MPD_HOST"] = os.getenv("MPD_HOST", "localhost")
    conf["MPD_PORT"] = int(os.getenv("MPD_PORT", "6600"))
    conf["CACHING_TIME"] = 10
    conf["DB_URI"] = os.path.join(conf_dir, "db.json")
    conf["SCRIPTS_PATH"] = os.path.join(conf_dir, "scripts")
    conf["ROUTE_PREFIX"] = ""
    conf["BOOTSTRAP_SERVE_LOCAL"] = True
    conf["SECRET_KEY"] = "Please replace me!"
    conf["MPD_WAIT_START"] = True
    conf["MPD_WAIT_START_RETRYSECS"] = 5
    conf["CHECK_SECS"] = 20  # period for checking playlist length
    conf["EVENT_TICK_SECS"] = 30  # period for scheduling events
    conf["DEBUG"] = False
    conf["LOG_CONFIG"] = False
    conf["TMPDIR"] = os.getenv("TMPDIR", "/tmp/")
    conf["FILE_PATH_SUGGESTION"] = ()  # tuple of paths
    conf["UI_CALENDAR_FREQUENCY_THRESHOLD"] = 4 * 60 * 60  # 4 hours
    conf["UI_CALENDAR_DATE_FMT"] = "medium"
    conf["EVENT_FILTERS"] = []
    conf["HTTP_PORT"] = 5000
    conf["HOME_URL"] = "/db/calendar"
    conf.update(from_envvars(prefix=prefix))
    return conf


def from_envvars(prefix=None, envvars=None, as_json=True):
    """Load environment variables in a dictionary

    Values are parsed as JSON. If parsing fails with a ValueError,
    values are instead used as verbatim strings.

    :param prefix: If ``None`` is passed as envvars, all variables from
                   ``environ`` starting with this prefix are imported. The
                   prefix is stripped upon import.
    :param envvars: A dictionary of mappings of environment-variable-names
                    to Flask configuration names. If a list is passed
                    instead, names are mapped 1:1. If ``None``, see prefix
                    argument.
    :param as_json: If False, values will not be parsed as JSON first.
    """
    conf = {}
    if prefix is None and envvars is None:
        raise RuntimeError("Must either give prefix or envvars argument")

    # if it's a list, convert to dict
    if isinstance(envvars, list):
        envvars = {k: None for k in envvars}

    if not envvars:
        envvars = {
            k: k[len(prefix) :] for k in os.environ.keys() if k.startswith(prefix)
        }

    for env_name, name in envvars.items():
        if name is None:
            name = env_name

        if env_name not in os.environ:
            continue

        if as_json:
            try:
                conf[name] = json.loads(os.environ[env_name])
            except ValueError:
                conf[name] = os.environ[env_name]
        else:
            conf[name] = os.environ[env_name]

    return conf