## 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
+```
+
+### Install the IM
+
+The pyangbind library, used by the IM to parse the Yang data models does not support Python3 at the moment. Work is being done in coordination with the pyangbind maintainer, and Python3 support is expected to hand in the near future.
+
+In the meantime, we will install and use Python3-compatible branches of pyangbind and the IM module.
+
+```
+sudo apt install libxml2-dev libxslt1-dev build-essential
+
+git clone http://github.com/adamisrael/pyangbind.git
+cd pyangbind
+pip3 install -r requirements.txt
+pip3 install -r requirements.DEVELOPER.txt
+
+sudo python3 setup.py develop
+```
+
+Checkout the IM module and use the proposed branch from Gerrit:
+```bash
+git clone https://osm.etsi.org/gerrit/osm/IM.git
+cd IM
+git fetch https://israelad@osm.etsi.org/gerrit/osm/IM refs/changes/78/5778/2 && git checkout FETCH_HEAD
+sudo python3 setup.py develop
+```
+
+```bash
+git clone https://osm.etsi.org/gerrit/osm/N2VC.git
+cd N2VC
+git fetch https://israelad@osm.etsi.org/gerrit/osm/N2VC refs/changes/70/5870/5 && git checkout FETCH_HEAD
+sudo python3 setup.py develop
+
+```
+
+## 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
+# 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=
+export VCA_PORT=17070
+# You can find these variables in ~/.local/share/juju/accounts.yaml
+export VCA_USER=admin
+export VCA_SECRET=PASSWORD
+```
+
+### 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.
+
+- `GetMetrics` does not work yet. There seems to be
+- 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
+```
projects / osm / N2VC.git / blobdiff