Adding and Using psutil Dependency

Owned by Stonebranch (Deactivated)
Jul 05, 2023
2 min read

Step 1 - Adding psutil dependency

Open requirements.txt and add psutil==5.9.4 as follows:

requirements.txt
#
# Specify any third-party Python modules that should be bundled with the
# extension. uip-cli will automatically download and bundle the modules
# upon running `uip build` or `uip push`. 
#
# Refer to https://pip.pypa.io/en/stable/reference/requirements-file-format/
# for the expected format.
#

requests==2.28.2
psutil==5.9.4

In addition to modifying requirements.txt, we will also need to modify src/extension.yml as follows:

extension.yml
extension:
  name: ue-task
  version: "1.0.0"
  api_level: "1.4.0"
  requires_python: ">=2.6"
  zip_safe: false
owner:
  name: Stonebranch
  organization: Stonebranch Inc.
comments: |
  Created using ue-task template

On line 6, the zip_safe property was set to false. This must be done, anytime an Extension uses a third party dependency requiring the C runtime (e.g. psutil).

Step 2 - Using the psutil dependency

Open extension.py and modify it as follows:

extension.py
from __future__ import (print_function)
from universal_extension import UniversalExtension
from universal_extension import ExtensionResult
from universal_extension import logger
import requests
import psutil


class Extension(UniversalExtension):
    """Required class that serves as the entry point for the extension
    """

    def __init__(self):
        """Initializes an instance of the 'Extension' class
        """
        # Call the base class initializer
        super(Extension, self).__init__()

    def extension_start(self, fields):
        """Required method that serves as the starting point for work performed
        for a task instance.

        Parameters
        ----------
        fields : dict
            populated with field values from the associated task instance
            launched in the Controller

        Returns
        -------
        ExtensionResult
            once the work is done, an instance of ExtensionResult must be
            returned. See the documentation for a full list of parameters that
            can be passed to the ExtensionResult class constructor
        """

        resp = requests.get(
            'https://httpbin.org/basic-auth/user/pass',
            auth=('user', 'pass')
        )
        print(resp.status_code)

        print(psutil.test())

        # Return the result with a payload containing a Hello message...
        return ExtensionResult(
            unv_output='Hello Extension!'
        )

On line 6, we import the psutil module

On lines 43, we print the result of psutil.test()

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