## Objective
-N2VC aims to be a generic VNF configuration and management (GVNFM) library, allowing OSM modules to interact with any supported GVNFM system.
+The N2VC library provides an OSM-centric interface to the VCA. This enables any OSM module (SO, LCM, osmclient) to use a standard pattern for communicating with Juju and the charms responsible for configuring a VNF.
+
+N2VC relies on the IM module, enforcing compliance with the OSM Information Model.
+
+## Caveats
+
+This library is in active development for OSM Release FOUR. The interface is subject to change prior to release.
+
+## Roadmap
+- Create the N2VC API (in progress)
+- Create a Python library implementing the N2VC API (in progress)
+- Implement N2VC API in SO
+- Implement N2VC API in lcm
+- Add support for N2VC in OSMClient
+
+## Requirements
+
+Because this is still in heavy development, there are a few manual steps required to use this library.
+
+
+```
+# This list is incomplete
+apt install python3-nose
+```
+
+### Install LXD and Juju
+
+In order to run the test(s) included in N2VC, you'll need to install Juju locally.
+
+*Note: It's not necessary to install the juju library via pip3; N2VC uses a version bundled within the modules/ directory.*
+
+```bash
+snap install lxd
+snap install juju --classic
+```
+
+## Metrics
+
+### Limitations
+
+There are currently a few limitations with regard to metrics in Juju.
+1. Metrics are polled by the Controller every five minutes. This interval is not modifiable
+2. The Juju API and CLI only expose the most recently polled metric, so it's necessary to poll the N2VC `GetMetrics` method more often, and discard duplicate values.
+
+
+## Testing
+A basic test has been written to exercise the functionality of the library, and to serve as a demonstration of how to use it.
+
+### Export settings to run test
+
+Export a few environment variables so the test knows where to find the VCA, and the compiled pingpong charm from the devops repository.
+
+```bash
+# The directory where the Juju configuration is stored
+export VCA_PATH=~/.local/share/juju
+
+# You can find the ip of the VCA by running `juju status -m controller` and looking for the DNS for Machine 0
+export VCA_HOST=`juju show-controller --format=json | jq -r '.osm["details"]["api-endpoints"][0]'|awk -F: '{print $1}'`
+export VCA_PORT=17070
+
+# You can find these variables in ~/.local/share/juju/accounts.yaml
+export VCA_USER=admin
+export VCA_SECRET=PASSWORD
+
+export LXD_HOST=`ifconfig lxdbr0 | grep 'inet '| cut -d: -f2 | awk '{ print $2}'`
+export LXD_SECRET=
+```
+
+### Run the test(s)
+
+*Note: There is a bug in the cleanup of the N2VC/Juju that will throw an exception after the test has finished. This is on the list of things to fix for R4 and should not impact your tests or integration.*
+
+```bash
+nosetests3 --nocapture tests/test_python.py
+```
+
+## Known Issues
+
+Many. This is still in active development for Release FOUR.
+
+- An exception is thrown after using N2VC, probably related to the internal AllWatcher used by juju.Model. This shouldn't break usage of N2VC, but it is ugly and needs to be fixed.
+
+```
+Exception ignored in: <generator object WebSocketCommonProtocol.close_connection at 0x7f29a3b3f780>
+Traceback (most recent call last):
+ File "/home/stone/.local/lib/python3.6/site-packages/websockets/protocol.py", line 743, in close_connection
+ if (yield from self.wait_for_connection_lost()):
+ File "/home/stone/.local/lib/python3.6/site-packages/websockets/protocol.py", line 768, in wait_for_connection_lost
+ self.timeout, loop=self.loop)
+ File "/usr/lib/python3.6/asyncio/tasks.py", line 342, in wait_for
+ timeout_handle = loop.call_later(timeout, _release_waiter, waiter)
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 543, in call_later
+ timer = self.call_at(self.time() + delay, callback, *args)
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 553, in call_at
+ self._check_closed()
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 357, in _check_closed
+ raise RuntimeError('Event loop is closed')
+RuntimeError: Event loop is closed
+Exception ignored in: <generator object Queue.get at 0x7f29a2ac6938>
+Traceback (most recent call last):
+ File "/usr/lib/python3.6/asyncio/queues.py", line 169, in get
+ getter.cancel() # Just in case getter is not done yet.
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 574, in call_soon
+ self._check_closed()
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 357, in _check_closed
+ raise RuntimeError('Event loop is closed')
+RuntimeError: Event loop is closed
+Exception ignored in: <coroutine object AllWatcherFacade.Next at 0x7f29a3bd9990>
+Traceback (most recent call last):
+ File "/home/stone/src/osm/N2VC/modules/libjuju/juju/client/facade.py", line 412, in wrapper
+ reply = await f(*args, **kwargs)
+ File "/home/stone/src/osm/N2VC/modules/libjuju/juju/client/_client1.py", line 59, in Next
+ reply = await self.rpc(msg)
+ File "/home/stone/src/osm/N2VC/modules/libjuju/juju/client/overrides.py", line 104, in rpc
+ result = await self.connection.rpc(msg, encoder=TypeEncoder)
+ File "/home/stone/src/osm/N2VC/modules/libjuju/juju/client/connection.py", line 306, in rpc
+ result = await self._recv(msg['request-id'])
+ File "/home/stone/src/osm/N2VC/modules/libjuju/juju/client/connection.py", line 208, in _recv
+ return await self.messages.get(request_id)
+ File "/home/stone/src/osm/N2VC/modules/libjuju/juju/utils.py", line 61, in get
+ value = await self._queues[id].get()
+ File "/usr/lib/python3.6/asyncio/queues.py", line 169, in get
+ getter.cancel() # Just in case getter is not done yet.
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 574, in call_soon
+ self._check_closed()
+ File "/usr/lib/python3.6/asyncio/base_events.py", line 357, in _check_closed
+ raise RuntimeError('Event loop is closed')
+RuntimeError: Event loop is closed
+```
+
+## Modules
+
+To update the libjuju module:
+
+Needs to be fully tested:
+```bash
+git checkout master
+git subtree pull --prefix=modules/libjuju/ --squash libjuju master
+<resolve any merge conflicts>
+git merge --continue
+```
projects / osm / N2VC.git / blobdiff