Source code for libqtile.widget.generic_poll_text

import json
from typing import Any, List, Tuple
from urllib.error import URLError
from urllib.request import Request, urlopen

from libqtile.log_utils import logger
from libqtile.widget import base

try:
    import xmltodict

    def xmlparse(body):
        return xmltodict.parse(body)
except ImportError:
    # TODO: we could implement a similar parser by hand, but i'm lazy, so let's
    # punt for now
    def xmlparse(body):
        raise Exception("no xmltodict library")


class GenPollText(base.ThreadPoolText):
    """A generic text widget that polls using poll function to get the text"""
    orientations = base.ORIENTATION_HORIZONTAL
    defaults = [
        ('func', None, 'Poll Function'),
    ]

    def __init__(self, **config):
        base.ThreadPoolText.__init__(self, "", **config)
        self.add_defaults(GenPollText.defaults)

    def poll(self):
        if not self.func:
            return "You need a poll function"
        return self.func()


class GenPollUrl(base.ThreadPoolText):
    """A generic text widget that polls an url and parses it using parse function"""
    orientations = base.ORIENTATION_HORIZONTAL
    defaults = [
        ('url', None, 'Url'),
        ('data', None, 'Post Data'),
        ('parse', None, 'Parse Function'),
        ('json', True, 'Is Json?'),
        ('user_agent', 'Qtile', 'Set the user agent'),
        ('headers', {}, 'Extra Headers'),
        ('xml', False, 'Is XML?'),
    ]  # type: List[Tuple[str, Any, str]]

    def __init__(self, **config):
        base.ThreadPoolText.__init__(self, "", **config)
        self.add_defaults(GenPollUrl.defaults)

        self.headers["User-agent"] = self.user_agent
        if self.json:
            self.headers['Content-Type'] = 'application/json'

        if self.data and not isinstance(self.data, str):
            self.data = json.dumps(self.data).encode()

    def fetch(self):
        req = Request(self.url, self.data, self.headers)
        res = urlopen(req)
        charset = res.headers.get_content_charset()

        body = res.read()
        if charset:
            body = body.decode(charset)

        if self.json:
            body = json.loads(body)

        if self.xml:
            body = xmlparse(body)
        return body

    def poll(self):
        if not self.parse or not self.url:
            return "Invalid config"

        try:
            body = self.fetch()
        except URLError:
            return "No network"

        try:
            text = self.parse(body)
        except Exception:
            logger.exception('got exception polling widget')
            text = "Can't parse"

        return text