.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gyexamples/plot_rest_api.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_gyexamples_plot_rest_api.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gyexamples_plot_rest_api.py:


Starts and queries a REST API
=============================

This example starts a :epkg:`waitress` server, creates
a :epkg:`WSGI` application based on :epkg:`falcon`
and queries the REST API. This application
returns the prediction from a model trained
on :epkg:`Iris dataset`.

.. GENERATED FROM PYTHON SOURCE LINES 12-13

Settings.

.. GENERATED FROM PYTHON SOURCE LINES 13-16

.. code-block:: default

    host = '127.0.0.1'
    port = 8096








.. GENERATED FROM PYTHON SOURCE LINES 17-19

Creates a dummy application and starts a server in a different process.
See :func:`dummy_application <lightmlrestapi.testing.dummy_applications.dummy_application>`.

.. GENERATED FROM PYTHON SOURCE LINES 19-28

.. code-block:: default



    def process_server(host, port):
        from lightmlrestapi.testing import dummy_application
        app = dummy_application()

        from waitress import serve
        serve(app, host=host, port=port)








.. GENERATED FROM PYTHON SOURCE LINES 29-31

Saves this code into a file and we start it
from a different process.

.. GENERATED FROM PYTHON SOURCE LINES 31-64

.. code-block:: default



    import os
    import lightmlrestapi

    header = """
    import sys
    sys.path.append(r'{0}')
    """.format(os.path.join(os.path.dirname(lightmlrestapi.__file__), '..'))

    import inspect
    code = "".join(inspect.getsourcelines(process_server)[0])
    code = header + code + "\nprocess_server('{0}', {1})\n".format(host, port)
    dest = os.path.abspath('temp_scripts')
    if not os.path.exists(dest):
        os.mkdir(dest)
    code_file = os.path.join(dest, "_start_server.py")
    print("Write file '{0}'.".format(code_file))
    with open(code_file, "w") as f:
        f.write(code)

    import sys
    from subprocess import Popen
    if sys.platform.startswith('win'):
        cmd = '{0} -u "{1}"'.format(sys.executable, code_file)
        print("Running '{0}'".format(cmd))
        proc = Popen(cmd)
    else:
        cmd = [sys.executable, '-u', code_file]
        print("Running '{0}'".format(cmd))
        proc = Popen(cmd)
    print('Start server, process id', proc.pid)





.. rst-class:: sphx-glr-script-out

 Out:

 .. code-block:: none

    Write file 'somewhere/workspace/lightmlrestapi/lightmlrestapi_UT_39_std/_doc/examples/temp_scripts/_start_server.py'.
    Running '['somewhere/workspace/lightmlrestapi/lightmlrestapi_UT_39_std/_venv/bin/python3.9', '-u', 'somewhere/workspace/lightmlrestapi/lightmlrestapi_UT_39_std/_doc/examples/temp_scripts/_start_server.py']'
    Start server, process id 32383




.. GENERATED FROM PYTHON SOURCE LINES 65-66

Let's wait.

.. GENERATED FROM PYTHON SOURCE LINES 66-69

.. code-block:: default

    from time import sleep
    sleep(3)








.. GENERATED FROM PYTHON SOURCE LINES 70-71

Let's query the server.

.. GENERATED FROM PYTHON SOURCE LINES 71-81

.. code-block:: default


    import requests
    import ujson
    features = ujson.dumps({'X': [0.1, 0.2]})
    try:
        r = requests.post('http://%s:%d' % (host, port), data=features)
        print(r.json())
    except Exception as e:
        print("ERROR: %r" % e)





.. rst-class:: sphx-glr-script-out

 Out:

 .. code-block:: none

    ERROR: ConnectionError(MaxRetryError("HTTPConnectionPool(host='127.0.0.1', port=8096): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fdc2e80e340>: Failed to establish a new connection: [Errno 111] Connection refused'))"))




.. GENERATED FROM PYTHON SOURCE LINES 82-83

Let's stop the server.

.. GENERATED FROM PYTHON SOURCE LINES 83-85

.. code-block:: default

    from pyquickhelper.loghelper import reap_children
    reap_children(subset={proc.pid}, fLOG=print)




.. rst-class:: sphx-glr-script-out

 Out:

 .. code-block:: none

    process psutil.Process(pid=32383, status='terminated', exitcode=<Negsignal.SIGTERM: -15>, started='07:17:18') terminated with exit code -15

    {32383}




.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  3.083 seconds)


.. _sphx_glr_download_gyexamples_plot_rest_api.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download sphx-glr-download-python

     :download:`Download Python source code: plot_rest_api.py <plot_rest_api.py>`



  .. container:: sphx-glr-download sphx-glr-download-jupyter

     :download:`Download Jupyter notebook: plot_rest_api.ipynb <plot_rest_api.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_