integrations/python-client/nexuscli/nexuscli_ow.py

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#   http://www.apache.org/licenses/LICENSE-2.0
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"""
This module provides a native python client interface to the NEXUS Livy
webservice API.

Usage:

    from nexuscli import nexuscli_ow
    
    nexuscli_ow.set_target("http://host:port")

    filename = "mycode.py"
    nexuscli_ow.run_file(filename)

    The code in the file passed to run_file must be valid pyspark code.
    Furthermore, it must have a main function that takes exactly one
    argument, the SparkContext.  The code can make use of that SparkContext
    variable, but should not create the SparkContext.

    code = "1+1"
    nexuscli_ow.run_str(code)

    The code passed to run_str can also be a multi-line string containing 
    valid python code.  It can also be a multi-line string containing 
    valid pyspark code.  For pyspark code the variable sc may be used to 
    access the SparkContext,  but it should not create the SparkContext.
"""
import ast

import requests

from nexuscli import nexuscli

session = requests.session()

set_target = nexuscli.set_target


def run_file(fname):
    files = {'file': open(fname, 'rb')}
    response = session.post(nexuscli.target + '/run_file', files=files)
    print(response.text)
    return response.text


def run_str(code):
    response = requests.post(nexuscli.target + '/run_str', data=code)
    ans = ast.literal_eval(response.text)['text/plain']
    for line in ans:
        print(line, end=" ")
    return ans