casa6

from casatasks import casalog

from casatools import quanta

import certifi

from datetime import datetime

import json, os, shutil

import ssl

from urllib import request

from urllib.error import HTTPError, URLError

from urllib.parse import urlencode, urlparse

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​

def _is_valid_url_host(url):

    parsed = urlparse(url)

    return bool(parsed.netloc)

​

​

def _query(url):

    myjson = 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:

                myjson = 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 myjson

​

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def getantposalma(

    outfile='', overwrite=False, asdm='', tw='', snr="default", search='both_latest',

    hosts=['tbd1.alma.cl', 'tbd2.alma.cl']

):

    r"""

Retrieve antenna positions by querying ALMA web service.

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[`Description`_] [`Examples`_] [`Development`_] [`Details`_]

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Parameters

   - outfile_ (path='') - Name of output file to which to write retrieved antenna positions.

   - overwrite_ (bool=False) - Overwrite a file by the same name if it exists?

   - asdm_ (string='') - The associated ASDM name. Must be specified

   - tw_ (string='') - Optional time window in which to consider baseline measurements in the database, when calculating the antenna positions.

   - snr_ (float=0) - Optional signal-to-noise.

   - search_ (string='both_latest') - Search algorithm to use.

   - hosts_ (stringVec=['https://asa.alma.cl/uncertainties-service/uncertainties/versions/last/measurements/casa/']) - Priority-ranked list of hosts to query.

​

​

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.. _Description:

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Description

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.. warning:: **WARNING**: This task should be considered experimental