casa6

from casatools import componentlist, measures, quanta

from casatasks import casalog

import certifi

from datetime import datetime, timedelta

import json

import numbers

import os, re, shutil

import ssl

from urllib import request

from urllib.error import URLError, HTTPError

from urllib.parse import urlparse, quote

​

​

def __is_valid_url_host(url):

    parsed = urlparse(url)

    return bool(parsed.netloc)

​

​

def __query(url):

    components = None

    response = None

    try:

        context = ssl.create_default_context(cafile=certifi.where())

        with request.urlopen(url, context=context, timeout=400) as response:

            if response.status == 200:

                components = json.loads(response.read().decode('utf-8'))

    except HTTPError as e:

        casalog.post(

            f"Caught HTTPError: {e.code} {e.reason}: {e.read().decode('utf-8')}",

            "WARN"

        )

    except URLError as e:

        casalog.post(f"Caught URLError: {str(e)}", "WARN")

    except Exception as e:

        casalog.post(f"Caught Exception when trying to connect: {str(e)}", "WARN")

    return components

​

​

def __getMJD(date_or_mjd, varname):

    if isinstance(date_or_mjd, numbers.Number):

        is_number = True

        mjd = date_or_mjd

    elif isinstance(date_or_mjd, str):

        pattern = "^\d{4}-\d{2}-\d{2}$"

        if re.match(pattern, date_or_mjd):

            is_number = False

            qa = quanta()

            mjd = int(qa.time(date_or_mjd, form="mjd")[0][:5])

        else:

            raise ValueError(

                f"If specified as a string, {varname} must be of the form "

                + "YYYY-MM-DD"

            )

    else:

        raise ValueError(

            f"{varname} must either be a number or a string of the form "

            + "YYYY-MM-DD"

        )

    return mjd

​

​

# function declaration and summary generated by casadocs

def getcalmodvla(outfile='', overwrite=False, source='', direction='', band='', obsdate='0', refdate='0', hosts=['http://obs.vla.nrao.edu/calmodvla']):