Revert "Remove vendored libjuju"

[osm/N2VC.git] / modules / libjuju / docs / readme.rst

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+A Python library for Juju
+=========================
+
+Source code: https://github.com/juju/python-libjuju
+
+Bug reports: https://github.com/juju/python-libjuju/issues
+
+Documentation: https://pythonlibjuju.readthedocs.io/en/latest/
+
+
+Requirements
+------------
+
+* Python 3.5+
+* Juju 2.0+
+
+
+Design Notes
+------------
+
+* Asynchronous - uses asyncio and async/await features of python 3.5
+* Websocket-level bindings are programmatically generated (indirectly) from the
+  Juju golang code, ensuring full api coverage
+* Provides an OO layer which encapsulates much of the websocket api and
+  provides familiar nouns and verbs (e.g. Model.deploy(), Application.add_unit(),
+  etc.)
+
+
+Installation
+------------
+
+.. code:: bash
+
+  pip3 install juju
+
+
+Quickstart
+----------
+Here's a simple example that shows basic usage of the library. The example
+connects to the currently active Juju model, deploys a single unit of the
+ubuntu charm, then exits:
+
+
+.. code:: python
+
+  #!/usr/bin/python3
+
+  import logging
+  import sys
+
+  from juju import loop
+  from juju.model import Model
+
+
+  async def deploy():
+      # Create a Model instance. We need to connect our Model to a Juju api
+      # server before we can use it.
+      model = Model()
+
+      # Connect to the currently active Juju model
+      await model.connect_current()
+
+      try:
+          # Deploy a single unit of the ubuntu charm, using the latest revision
+          # from the stable channel of the Charm Store.
+          ubuntu_app = await model.deploy(
+            'ubuntu',
+            application_name='ubuntu',
+            series='xenial',
+            channel='stable',
+          )
+
+          if '--wait' in sys.argv:
+              # optionally block until the application is ready
+              await model.block_until(lambda: ubuntu_app.status == 'active')
+      finally:
+          # Disconnect from the api server and cleanup.
+          await model.disconnect()
+
+
+  def main():
+      logging.basicConfig(level=logging.INFO)
+
+      # If you want to see everything sent over the wire, set this to DEBUG.
+      ws_logger = logging.getLogger('websockets.protocol')
+      ws_logger.setLevel(logging.INFO)
+
+      # Run the deploy coroutine in an asyncio event loop, using a helper
+      # that abstracts loop creation and teardown.
+      loop.run(deploy())
+
+
+  if __name__ == '__main__':
+      main()
+
+
+More examples can be found in the docs, as well as in the ``examples/``
+directory of the source tree which can be run using ``tox``.  For
+example, to run ``examples/connect_current_model.py``, use:
+
+.. code:: bash
+
+  tox -e example -- examples/connect_current_model.py