X-Git-Url: https://osm.etsi.org/gitweb/?p=osm%2FN2VC.git;a=blobdiff_plain;f=n2vc%2Fvnf.py;h=4e467469f800c590ab573d9204171309dc446888;hp=d3ad90cc0b0da65de2ab8fe6ba9d832464f92254;hb=refs%2Ftags%2Frelease-v8.0-start;hpb=5afe05434f65dabf514636eff28cbb2069ccb419;ds=sidebyside diff --git a/n2vc/vnf.py b/n2vc/vnf.py index d3ad90c..4e46746 100644 --- a/n2vc/vnf.py +++ b/n2vc/vnf.py @@ -1,24 +1,44 @@ - +# Copyright 2019 Canonical Ltd. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import asyncio +import base64 +import binascii import logging -import os import os.path import re +import shlex import ssl -import sys -import time - -# FIXME: this should load the juju inside or modules without having to -# explicitly install it. Check why it's not working. -# Load our subtree of the juju library -path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..')) -path = os.path.join(path, "modules/libjuju/") -if path not in sys.path: - sys.path.insert(1, path) +import subprocess +from juju.client import client from juju.controller import Controller -from juju.model import Model, ModelObserver +from juju.errors import JujuAPIError, JujuError +from juju.model import ModelObserver +import n2vc.exceptions +from n2vc.provisioner import SSHProvisioner + +# import time +# FIXME: this should load the juju inside or modules without having to +# explicitly install it. Check why it's not working. +# Load our subtree of the juju library +# path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..')) +# path = os.path.join(path, "modules/libjuju/") +# if path not in sys.path: +# sys.path.insert(1, path) # We might need this to connect to the websocket securely, but test and verify. try: ssl._create_default_https_context = ssl._create_unverified_context @@ -29,6 +49,7 @@ except AttributeError: # Custom exceptions +# Deprecated. Please use n2vc.exceptions namespace. class JujuCharmNotFound(Exception): """The Charm can't be found or is not readable.""" @@ -41,29 +62,37 @@ class N2VCPrimitiveExecutionFailed(Exception): """Something failed while attempting to execute a primitive.""" +class NetworkServiceDoesNotExist(Exception): + """The Network Service being acted against does not exist.""" + + +class PrimitiveDoesNotExist(Exception): + """The Primitive being executed does not exist.""" + + # Quiet the debug logging -logging.getLogger('websockets.protocol').setLevel(logging.INFO) -logging.getLogger('juju.client.connection').setLevel(logging.WARN) -logging.getLogger('juju.model').setLevel(logging.WARN) -logging.getLogger('juju.machine').setLevel(logging.WARN) +logging.getLogger("websockets.protocol").setLevel(logging.INFO) +logging.getLogger("juju.client.connection").setLevel(logging.WARN) +logging.getLogger("juju.model").setLevel(logging.WARN) +logging.getLogger("juju.machine").setLevel(logging.WARN) class VCAMonitor(ModelObserver): """Monitor state changes within the Juju Model.""" + log = None - ns_name = None - applications = {} def __init__(self, ns_name): self.log = logging.getLogger(__name__) self.ns_name = ns_name + self.applications = {} def AddApplication(self, application_name, callback, *callback_args): if application_name not in self.applications: self.applications[application_name] = { - 'callback': callback, - 'callback_args': callback_args + "callback": callback, + "callback_args": callback_args, } def RemoveApplication(self, application_name): @@ -75,43 +104,40 @@ class VCAMonitor(ModelObserver): if delta.entity == "unit": # Ignore change events from other applications - if delta.data['application'] not in self.applications.keys(): + if delta.data["application"] not in self.applications.keys(): return try: - application_name = delta.data['application'] + application_name = delta.data["application"] - callback = self.applications[application_name]['callback'] - callback_args = self.applications[application_name]['callback_args'] + callback = self.applications[application_name]["callback"] + callback_args = self.applications[application_name]["callback_args"] if old and new: - old_status = old.workload_status - new_status = new.workload_status - - if old_status == new_status: - """The workload status may fluctuate around certain events, - so wait until the status has stabilized before triggering - the callback.""" - if callback: - callback( - self.ns_name, - delta.data['application'], - new_status, - new.workload_status_message, - *callback_args) + # Fire off a callback with the application state + if callback: + callback( + self.ns_name, + delta.data["application"], + new.workload_status, + new.workload_status_message, + *callback_args, + ) if old and not new: # This is a charm being removed if callback: callback( self.ns_name, - delta.data['application'], + delta.data["application"], "removed", "", - *callback_args) + *callback_args, + ) except Exception as e: - self.log.debug("[1] notify_callback exception {}".format(e)) + self.log.debug("[1] notify_callback exception: {}".format(e)) + elif delta.entity == "action": # TODO: Decide how we want to notify the user of actions @@ -130,6 +156,7 @@ class VCAMonitor(ModelObserver): pass + ######## # TODO # @@ -138,117 +165,286 @@ class VCAMonitor(ModelObserver): class N2VC: - - # Juju API - api = None - log = None - controller = None - connecting = False - authenticated = False - - models = {} - default_model = None - - # Model Observers - monitors = {} - - # VCA config - hostname = "" - port = 17070 - username = "" - secret = "" - - def __init__(self, - log=None, - server='127.0.0.1', - port=17070, - user='admin', - secret=None, - artifacts=None - ): + def __init__( + self, + log=None, + server="127.0.0.1", + port=17070, + user="admin", + secret=None, + artifacts=None, + loop=None, + juju_public_key=None, + ca_cert=None, + api_proxy=None, + ): """Initialize N2VC - :param vcaconfig dict A dictionary containing the VCA configuration + Initializes the N2VC object, allowing the caller to interoperate with the VCA. + - :param artifacts str The directory where charms required by a vnfd are + :param log obj: The logging object to log to + :param server str: The IP Address or Hostname of the Juju controller + :param port int: The port of the Juju Controller + :param user str: The Juju username to authenticate with + :param secret str: The Juju password to authenticate with + :param artifacts str: The directory where charms required by a vnfd are stored. + :param loop obj: The loop to use. + :param juju_public_key str: The contents of the Juju public SSH key + :param ca_cert str: The CA certificate to use to authenticate + :param api_proxy str: The IP of the host machine :Example: - n2vc = N2VC(vcaconfig={ - 'secret': 'MzI3MDJhOTYxYmM0YzRjNTJiYmY1Yzdm', - 'user': 'admin', - 'ip-address': '10.44.127.137', - 'port': 17070, - 'artifacts': '/path/to/charms' - }) - + client = n2vc.vnf.N2VC( + log=log, + server='10.1.1.28', + port=17070, + user='admin', + secret='admin', + artifacts='/app/storage/myvnf/charms', + loop=loop, + juju_public_key='', + ca_cert='', + api_proxy='192.168.1.155' + ) """ + # Initialize instance-level variables + self.api = None + self.log = None + self.controller = None + self.connecting = False + self.authenticated = False + self.api_proxy = api_proxy + if log: self.log = log else: self.log = logging.getLogger(__name__) + # For debugging + self.refcount = { + "controller": 0, + "model": 0, + } + + self.models = {} + + # Model Observers + self.monitors = {} + + # VCA config + self.hostname = "" + self.port = 17070 + self.username = "" + self.secret = "" + + self.juju_public_key = juju_public_key + if juju_public_key: + self._create_juju_public_key(juju_public_key) + else: + self.juju_public_key = "" + + # TODO: Verify ca_cert is valid before using. VCA will crash + # if the ca_cert isn't formatted correctly. + def base64_to_cacert(b64string): + """Convert the base64-encoded string containing the VCA CACERT. + + The input string.... + + """ + try: + cacert = base64.b64decode(b64string).decode("utf-8") + + cacert = re.sub(r"\\n", r"\n", cacert,) + except binascii.Error as e: + self.log.debug("Caught binascii.Error: {}".format(e)) + raise n2vc.exceptions.N2VCInvalidCertificate("Invalid CA Certificate") + + return cacert + + self.ca_cert = None + if ca_cert: + self.ca_cert = base64_to_cacert(ca_cert) + # Quiet websocket traffic - logging.getLogger('websockets.protocol').setLevel(logging.INFO) - logging.getLogger('juju.client.connection').setLevel(logging.WARN) - logging.getLogger('model').setLevel(logging.WARN) + logging.getLogger("websockets.protocol").setLevel(logging.INFO) + logging.getLogger("juju.client.connection").setLevel(logging.WARN) + logging.getLogger("model").setLevel(logging.WARN) # logging.getLogger('websockets.protocol').setLevel(logging.DEBUG) - self.log.debug('JujuApi: instantiated') + self.log.debug("JujuApi: instantiated") self.server = server self.port = port self.secret = secret - if user.startswith('user-'): + if user.startswith("user-"): self.user = user else: - self.user = 'user-{}'.format(user) + self.user = "user-{}".format(user) - self.endpoint = '%s:%d' % (server, int(port)) + self.endpoint = "%s:%d" % (server, int(port)) self.artifacts = artifacts + self.loop = loop or asyncio.get_event_loop() + def __del__(self): """Close any open connections.""" yield self.logout() - def notify_callback(self, model_name, application_name, status, message, callback=None, *callback_args): + def _create_juju_public_key(self, public_key): + """Recreate the Juju public key on disk. + + Certain libjuju commands expect to be run from the same machine as Juju + is bootstrapped to. This method will write the public key to disk in + that location: ~/.local/share/juju/ssh/juju_id_rsa.pub + """ + # Make sure that we have a public key before writing to disk + if public_key is None or len(public_key) == 0: + if "OSM_VCA_PUBKEY" in os.environ: + public_key = os.getenv("OSM_VCA_PUBKEY", "") + if len(public_key == 0): + return + else: + return + + path = "{}/.local/share/juju/ssh".format(os.path.expanduser("~"),) + if not os.path.exists(path): + os.makedirs(path) + + with open("{}/juju_id_rsa.pub".format(path), "w") as f: + f.write(public_key) + + def notify_callback( + self, + model_name, + application_name, + status, + message, + callback=None, + *callback_args + ): try: if callback: - callback(model_name, application_name, status, message, *callback_args) + callback( + model_name, application_name, status, message, *callback_args, + ) except Exception as e: self.log.error("[0] notify_callback exception {}".format(e)) raise e return True # Public methods - async def CreateNetworkService(self, nsd): - """Create a new model to encapsulate this network service. + async def Relate(self, model_name, vnfd): + """Create a relation between the charm-enabled VDUs in a VNF. - Create a new model in the Juju controller to encapsulate the - charms associated with a network service. + The Relation mapping has two parts: the id of the vdu owning the endpoint, and + the name of the endpoint. - You can pass either the nsd record or the id of the network - service, but this method will fail without one of them. - """ - if not self.authenticated: - await self.login() + vdu: + ... + vca-relationships: + relation: + - provides: dataVM:db + requires: mgmtVM:app - # Ideally, we will create a unique model per network service. - # This change will require all components, i.e., LCM and SO, to use - # N2VC for 100% compatibility. If we adopt unique models for the LCM, - # services deployed via LCM would't be manageable via SO and vice versa + This tells N2VC that the charm referred to by the dataVM vdu offers a relation + named 'db', and the mgmtVM vdu + has an 'app' endpoint that should be connected to a database. - return self.default_model + :param str ns_name: The name of the network service. + :param dict vnfd: The parsed yaml VNF descriptor. + """ - async def DeployCharms(self, model_name, application_name, vnfd, charm_path, params={}, machine_spec={}, callback=None, *callback_args): + # Currently, the call to Relate() is made automatically after the + # deployment of each charm; if the relation depends on a charm that + # hasn't been deployed yet, the call will fail silently. This will + # prevent an API breakage, with the intent of making this an explicitly + # required call in a more object-oriented refactor of the N2VC API. + + configs = [] + vnf_config = vnfd.get("vnf-configuration") + if vnf_config: + juju = vnf_config["juju"] + if juju: + configs.append(vnf_config) + + for vdu in vnfd["vdu"]: + vdu_config = vdu.get("vdu-configuration") + if vdu_config: + juju = vdu_config["juju"] + if juju: + configs.append(vdu_config) + + def _get_application_name(name): + """Get the application name that's mapped to a vnf/vdu.""" + vnf_member_index = 0 + vnf_name = vnfd["name"] + + for vdu in vnfd.get("vdu"): + # Compare the named portion of the relation to the vdu's id + if vdu["id"] == name: + application_name = self.FormatApplicationName( + model_name, vnf_name, str(vnf_member_index), + ) + return application_name + else: + vnf_member_index += 1 + + return None + + # Loop through relations + for cfg in configs: + if "juju" in cfg: + juju = cfg["juju"] + if ( + "vca-relationships" in juju + and "relation" in juju["vca-relationships"] + ): + for rel in juju["vca-relationships"]["relation"]: + try: + + # get the application name for the provides + (name, endpoint) = rel["provides"].split(":") + application_name = _get_application_name(name) + + provides = "{}:{}".format(application_name, endpoint) + + # get the application name for thr requires + (name, endpoint) = rel["requires"].split(":") + application_name = _get_application_name(name) + + requires = "{}:{}".format(application_name, endpoint) + self.log.debug( + "Relation: {} <-> {}".format(provides, requires) + ) + await self.add_relation( + model_name, provides, requires, + ) + except Exception as e: + self.log.debug("Exception: {}".format(e)) + + return + + async def DeployCharms( + self, + model_name, + application_name, + vnfd, + charm_path, + params={}, + machine_spec={}, + callback=None, + *callback_args + ): """Deploy one or more charms associated with a VNF. Deploy the charm(s) referenced in a VNF Descriptor. - :param str model_name: The name of the network service. + :param str model_name: The name or unique id of the network service. :param str application_name: The name of the application :param dict vnfd: The name of the application :param str charm_path: The path to the Juju charm @@ -258,15 +454,20 @@ class N2VC: 'rw_mgmt_ip': '1.2.3.4', # Pass the initial-config-primitives section of the vnf or vdu 'initial-config-primitives': {...} + 'user_values': dictionary with the day-1 parameters provided at + instantiation time. It will replace values + inside < >. rw_mgmt_ip will be included here also } - :param dict machine_spec: A dictionary describing the machine to install to + :param dict machine_spec: A dictionary describing the machine to + install to Examples:: { 'hostname': '1.2.3.4', 'username': 'ubuntu', } :param obj callback: A callback function to receive status changes. - :param tuple callback_args: A list of arguments to be passed to the callback + :param tuple callback_args: A list of arguments to be passed to the + callback """ ######################################################## @@ -274,7 +475,14 @@ class N2VC: ######################################################## if not os.path.exists(charm_path): self.log.debug("Charm path doesn't exist: {}".format(charm_path)) - self.notify_callback(model_name, application_name, "failed", callback, *callback_args) + self.notify_callback( + model_name, + application_name, + "error", + "failed", + callback, + *callback_args, + ) raise JujuCharmNotFound("No artifacts configured.") ################################ @@ -287,9 +495,6 @@ class N2VC: ########################################## # Get the model for this network service # ########################################## - # TODO: In a point release, we will use a model per deployed network - # service. In the meantime, we will always use the 'default' model. - model_name = 'default' model = await self.get_model(model_name) ######################################## @@ -297,55 +502,106 @@ class N2VC: ######################################## app = await self.get_application(model, application_name) if app: - raise JujuApplicationExists("Can't deploy application \"{}\" to model \"{}\" because it already exists.".format(application_name, model_name)) + raise JujuApplicationExists( + ( + 'Can\'t deploy application "{}" to model ' + ' "{}" because it already exists.' + ).format(application_name, model_name) + ) ################################################################ # Register this application with the model-level event monitor # ################################################################ if callback: - self.monitors[model_name].AddApplication( - application_name, - callback, - *callback_args + self.log.debug( + "JujuApi: Registering callback for {}".format(application_name,) ) - - ######################################################## - # Check for specific machine placement (native charms) # - ######################################################## - to = "" - if machine_spec.keys(): - # TODO: This needs to be tested. - # if all(k in machine_spec for k in ['hostname', 'username']): - # # Enlist the existing machine in Juju - # machine = await self.model.add_machine(spec='ssh:%@%'.format( - # specs['host'], - # specs['user'], - # )) - # to = machine.id - pass + await self.Subscribe(model_name, application_name, callback, *callback_args) ####################################### # Get the initial charm configuration # ####################################### rw_mgmt_ip = None - if 'rw_mgmt_ip' in params: - rw_mgmt_ip = params['rw_mgmt_ip'] + if "rw_mgmt_ip" in params: + rw_mgmt_ip = params["rw_mgmt_ip"] - # initial_config = {} - if 'initial-config-primitive' not in params: - params['initial-config-primitive'] = {} + if "initial-config-primitive" not in params: + params["initial-config-primitive"] = {} initial_config = self._get_config_from_dict( - params['initial-config-primitive'], - {'': rw_mgmt_ip} + params["initial-config-primitive"], {"": rw_mgmt_ip} ) - self.log.debug("JujuApi: Deploying charm ({}) from {}".format( - application_name, - charm_path, - to=to, - )) + ######################################################## + # Check for specific machine placement (native charms) # + ######################################################## + to = "" + series = "xenial" + + if machine_spec.keys(): + if all(k in machine_spec for k in ["hostname", "username"]): + + # Allow series to be derived from the native charm + series = None + + self.log.debug( + "Provisioning manual machine {}@{}".format( + machine_spec["username"], machine_spec["hostname"], + ) + ) + + """Native Charm support + + Taking a bare VM (assumed to be an Ubuntu cloud image), + the provisioning process will: + - Create an ubuntu user w/sudo access + - Detect hardware + - Detect architecture + - Download and install Juju agent from controller + - Enable Juju agent + - Add an iptables rule to route traffic to the API proxy + """ + + to = await self.provision_machine( + model_name=model_name, + username=machine_spec["username"], + hostname=machine_spec["hostname"], + private_key_path=self.GetPrivateKeyPath(), + ) + self.log.debug("Provisioned machine id {}".format(to)) + + # TODO: If to is none, raise an exception + + # The native charm won't have the sshproxy layer, typically, but LCM + # uses the config primitive + # to interpret what the values are. That's a gap to fill. + + """ + The ssh-* config parameters are unique to the sshproxy layer, + which most native charms will not be aware of. + + Setting invalid config parameters will cause the deployment to + fail. + + For the moment, we will strip the ssh-* parameters from native + charms, until the feature gap is addressed in the information + model. + """ + + # Native charms don't include the ssh-* config values, so strip them + # from the initial_config, otherwise the deploy will raise an error. + # self.log.debug("Removing ssh-* from initial-config") + for k in ["ssh-hostname", "ssh-username", "ssh-password"]: + if k in initial_config: + self.log.debug("Removing parameter {}".format(k)) + del initial_config[k] + + self.log.debug( + "JujuApi: Deploying charm ({}/{}) from {} to {}".format( + model_name, application_name, charm_path, to, + ) + ) ######################################################## # Deploy the charm and apply the initial configuration # @@ -358,68 +614,113 @@ class N2VC: application_name=application_name, # Proxy charms should use the current LTS. This will need to be # changed for native charms. - series='xenial', + series=series, # Apply the initial 'config' primitive during deployment config=initial_config, - # TBD: Where to deploy the charm to. - to=None, + # Where to deploy the charm to. + to=to, ) + ############################# + # Map the vdu id<->app name # + ############################# + try: + await self.Relate(model_name, vnfd) + except KeyError as ex: + # We don't currently support relations between NS and VNF/VDU charms + self.log.warn("[N2VC] Relations not supported: {}".format(ex)) + except Exception: + # This may happen if not all of the charms needed by the relation + # are ready. We can safely ignore this, because Relate will be + # retried when the endpoint of the relation is deployed. + self.log.warn("[N2VC] Relations not ready") + # ####################################### # # Execute initial config primitive(s) # # ####################################### - primitives = {} + uuids = await self.ExecuteInitialPrimitives( + model_name, application_name, params, + ) + return uuids + + # primitives = {} + # + # # Build a sequential list of the primitives to execute + # for primitive in params['initial-config-primitive']: + # try: + # if primitive['name'] == 'config': + # # This is applied when the Application is deployed + # pass + # else: + # seq = primitive['seq'] + # + # params = {} + # if 'parameter' in primitive: + # params = primitive['parameter'] + # + # primitives[seq] = { + # 'name': primitive['name'], + # 'parameters': self._map_primitive_parameters( + # params, + # {'': rw_mgmt_ip} + # ), + # } + # + # for primitive in sorted(primitives): + # await self.ExecutePrimitive( + # model_name, + # application_name, + # primitives[primitive]['name'], + # callback, + # callback_args, + # **primitives[primitive]['parameters'], + # ) + # except N2VCPrimitiveExecutionFailed as e: + # self.log.debug( + # "[N2VC] Exception executing primitive: {}".format(e) + # ) + # raise - # Build a sequential list of the primitives to execute - for primitive in params['initial-config-primitive']: - try: - if primitive['name'] == 'config': - # This is applied when the Application is deployed - pass - else: - seq = primitive['seq'] + async def GetPrimitiveStatus(self, model_name, uuid): + """Get the status of an executed Primitive. - params = {} - if 'parameter' in primitive: - params = primitive['parameter'] + The status of an executed Primitive will be one of three values: + - completed + - failed + - running + """ + status = None + try: + if not self.authenticated: + await self.login() - primitives[seq] = { - 'name': primitive['name'], - 'parameters': self._map_primitive_parameters( - params, - {'': rw_mgmt_ip} - ), - } + model = await self.get_model(model_name) - for primitive in sorted(primitives): - await self.ExecutePrimitive( - model_name, - application_name, - primitives[primitive]['name'], - callback, - callback_args, - **primitives[primitive]['parameters'], - ) - except N2VCPrimitiveExecutionFailed as e: - self.log.debug( - "[N2VC] Exception executing primitive: {}".format(e) - ) - raise + results = await model.get_action_status(uuid) - async def GetPrimitiveStatus(self, model_name, uuid): + if uuid in results: + status = results[uuid] + + except Exception as e: + self.log.debug( + "Caught exception while getting primitive status: {}".format(e) + ) + raise N2VCPrimitiveExecutionFailed(e) + + return status + + async def GetPrimitiveOutput(self, model_name, uuid): + """Get the output of an executed Primitive. + + Note: this only returns output for a successfully executed primitive. + """ results = None try: if not self.authenticated: await self.login() - # FIXME: This is hard-coded until model-per-ns is added - model_name = 'default' - - model = await self.controller.get_model(model_name) - - results = await model.get_action_output(uuid) - - await model.disconnect() + model = await self.get_model(model_name) + results = await model.get_action_output(uuid, 60) except Exception as e: self.log.debug( "Caught exception while getting primitive status: {}".format(e) @@ -428,18 +729,166 @@ class N2VC: return results + # async def ProvisionMachine(self, model_name, hostname, username): + # """Provision machine for usage with Juju. + # + # Provisions a previously instantiated machine for use with Juju. + # """ + # try: + # if not self.authenticated: + # await self.login() + # + # # FIXME: This is hard-coded until model-per-ns is added + # model_name = 'default' + # + # model = await self.get_model(model_name) + # model.add_machine(spec={}) + # + # machine = await model.add_machine(spec='ssh:{}@{}:{}'.format( + # "ubuntu", + # host['address'], + # private_key_path, + # )) + # return machine.id + # + # except Exception as e: + # self.log.debug( + # "Caught exception while getting primitive status: {}".format(e) + # ) + # raise N2VCPrimitiveExecutionFailed(e) + + def GetPrivateKeyPath(self): + homedir = os.environ["HOME"] + sshdir = "{}/.ssh".format(homedir) + private_key_path = "{}/id_n2vc_rsa".format(sshdir) + return private_key_path + + async def GetPublicKey(self): + """Get the N2VC SSH public key.abs + + Returns the SSH public key, to be injected into virtual machines to + be managed by the VCA. + + The first time this is run, a ssh keypair will be created. The public + key is injected into a VM so that we can provision the machine with + Juju, after which Juju will communicate with the VM directly via the + juju agent. + """ + # public_key = "" + + # Find the path to where we expect our key to live. + homedir = os.environ["HOME"] + sshdir = "{}/.ssh".format(homedir) + if not os.path.exists(sshdir): + os.mkdir(sshdir) - async def ExecutePrimitive(self, model_name, application_name, primitive, callback, *callback_args, **params): + private_key_path = "{}/id_n2vc_rsa".format(sshdir) + public_key_path = "{}.pub".format(private_key_path) + + # If we don't have a key generated, generate it. + if not os.path.exists(private_key_path): + cmd = "ssh-keygen -t {} -b {} -N '' -f {}".format( + "rsa", "4096", private_key_path + ) + subprocess.check_output(shlex.split(cmd)) + + # Read the public key + with open(public_key_path, "r") as f: + public_key = f.readline() + + return public_key + + async def ExecuteInitialPrimitives( + self, model_name, application_name, params, callback=None, *callback_args + ): + """Execute multiple primitives. + + Execute multiple primitives as declared in initial-config-primitive. + This is useful in cases where the primitives initially failed -- for + example, if the charm is a proxy but the proxy hasn't been configured + yet. + """ + uuids = [] + primitives = {} + + # Build a sequential list of the primitives to execute + for primitive in params["initial-config-primitive"]: + try: + if primitive["name"] == "config": + pass + else: + seq = primitive["seq"] + + params_ = {} + if "parameter" in primitive: + params_ = primitive["parameter"] + + user_values = params.get("user_values", {}) + if "rw_mgmt_ip" not in user_values: + user_values["rw_mgmt_ip"] = None + # just for backward compatibility, because it will be provided + # always by modern version of LCM + + primitives[seq] = { + "name": primitive["name"], + "parameters": self._map_primitive_parameters( + params_, user_values + ), + } + + for primitive in sorted(primitives): + try: + # self.log.debug("Queuing action {}".format( + # primitives[primitive]['name'])) + uuids.append( + await self.ExecutePrimitive( + model_name, + application_name, + primitives[primitive]["name"], + callback, + callback_args, + **primitives[primitive]["parameters"], + ) + ) + except PrimitiveDoesNotExist as e: + self.log.debug( + "Ignoring exception PrimitiveDoesNotExist: {}".format(e) + ) + pass + except Exception as e: + self.log.debug( + ( + "XXXXXXXXXXXXXXXXXXXXXXXXX Unexpected exception: {}" + ).format(e) + ) + raise e + + except N2VCPrimitiveExecutionFailed as e: + self.log.debug("[N2VC] Exception executing primitive: {}".format(e)) + raise + return uuids + + async def ExecutePrimitive( + self, + model_name, + application_name, + primitive, + callback, + *callback_args, + **params + ): """Execute a primitive of a charm for Day 1 or Day 2 configuration. Execute a primitive defined in the VNF descriptor. - :param str model_name: The name of the network service. + :param str model_name: The name or unique id of the network service. :param str application_name: The name of the application :param str primitive: The name of the primitive to execute. :param obj callback: A callback function to receive status changes. - :param tuple callback_args: A list of arguments to be passed to the callback function. - :param dict params: A dictionary of key=value pairs representing the primitive's parameters + :param tuple callback_args: A list of arguments to be passed to the + callback function. + :param dict params: A dictionary of key=value pairs representing the + primitive's parameters Examples:: { 'rw_mgmt_ip': '1.2.3.4', @@ -447,43 +896,47 @@ class N2VC: 'initial-config-primitives': {...} } """ + self.log.debug("Executing primitive={} params={}".format(primitive, params)) uuid = None try: if not self.authenticated: await self.login() - # FIXME: This is hard-coded until model-per-ns is added - model_name = 'default' - - model = await self.controller.get_model(model_name) + model = await self.get_model(model_name) - if primitive == 'config': + if primitive == "config": # config is special, and expecting params to be a dictionary await self.set_config( - model, - application_name, - params['params'], + model, application_name, params["params"], ) else: app = await self.get_application(model, application_name) if app: + # Does this primitive exist? + actions = await app.get_actions() + + if primitive not in actions.keys(): + raise PrimitiveDoesNotExist( + "Primitive {} does not exist".format(primitive) + ) + # Run against the first (and probably only) unit in the app unit = app.units[0] if unit: - self.log.debug( - "Executing primitive {}".format(primitive) - ) action = await unit.run_action(primitive, **params) uuid = action.id - await model.disconnect() + except PrimitiveDoesNotExist as e: + # Catch and raise this exception if it's thrown from the inner block + raise e except Exception as e: - self.log.debug( - "Caught exception while executing primitive: {}".format(e) - ) + # An unexpected exception was caught + self.log.debug("Caught exception while executing primitive: {}".format(e)) raise N2VCPrimitiveExecutionFailed(e) return uuid - async def RemoveCharms(self, model_name, application_name, callback=None, *callback_args): + async def RemoveCharms( + self, model_name, application_name, callback=None, *callback_args + ): """Remove a charm from the VCA. Remove a charm referenced in a VNF Descriptor. @@ -491,7 +944,8 @@ class N2VC: :param str model_name: The name of the network service. :param str application_name: The name of the application :param obj callback: A callback function to receive status changes. - :param tuple callback_args: A list of arguments to be passed to the callback function. + :param tuple callback_args: A list of arguments to be passed to the + callback function. """ try: if not self.authenticated: @@ -501,27 +955,126 @@ class N2VC: app = await self.get_application(model, application_name) if app: # Remove this application from event monitoring - self.monitors[model_name].RemoveApplication(application_name) + await self.Unsubscribe(model_name, application_name) - # self.notify_callback(model_name, application_name, "removing", callback, *callback_args) + # self.notify_callback(model_name, application_name, "removing", + # callback, *callback_args) self.log.debug("Removing the application {}".format(application_name)) await app.remove() - # Notify the callback that this charm has been removed. - self.notify_callback(model_name, application_name, "removed", callback, *callback_args) + # await self.disconnect_model(self.monitors[model_name]) + + self.notify_callback( + model_name, + application_name, + "removed", + "Removing charm {}".format(application_name), + callback, + *callback_args, + ) except Exception as e: print("Caught exception: {}".format(e)) self.log.debug(e) raise e - async def DestroyNetworkService(self, nsd): - raise NotImplementedError() + async def CreateNetworkService(self, ns_uuid): + """Create a new Juju model for the Network Service. + + Creates a new Model in the Juju Controller. + + :param str ns_uuid: A unique id representing an instaance of a + Network Service. + + :returns: True if the model was created. Raises JujuError on failure. + """ + if not self.authenticated: + await self.login() + + models = await self.controller.list_models() + if ns_uuid not in models: + # Get the new model + await self.get_model(ns_uuid) + + return True + + async def DestroyNetworkService(self, ns_uuid): + """Destroy a Network Service. + + Destroy the Network Service and any deployed charms. + + :param ns_uuid The unique id of the Network Service + + :returns: True if the model was created. Raises JujuError on failure. + """ + + # Do not delete the default model. The default model was used by all + # Network Services, prior to the implementation of a model per NS. + if ns_uuid.lower() == "default": + return False + + if not self.authenticated: + await self.login() + + models = await self.controller.list_models() + if ns_uuid in models: + model = await self.controller.get_model(ns_uuid) + + for application in model.applications: + app = model.applications[application] + + await self.RemoveCharms(ns_uuid, application) + + self.log.debug("Unsubscribing Watcher for {}".format(application)) + await self.Unsubscribe(ns_uuid, application) + + self.log.debug("Waiting for application to terminate") + timeout = 30 + try: + await model.block_until( + lambda: all( + unit.workload_status in ["terminated"] for unit in app.units + ), + timeout=timeout, + ) + except Exception: + self.log.debug( + "Timed out waiting for {} to terminate.".format(application) + ) + + for machine in model.machines: + try: + self.log.debug("Destroying machine {}".format(machine)) + await model.machines[machine].destroy(force=True) + except JujuAPIError as e: + if "does not exist" in str(e): + # Our cached model may be stale, because the machine + # has already been removed. It's safe to continue. + continue + else: + self.log.debug("Caught exception: {}".format(e)) + raise e + + # Disconnect from the Model + if ns_uuid in self.models: + self.log.debug("Disconnecting model {}".format(ns_uuid)) + # await self.disconnect_model(self.models[ns_uuid]) + await self.disconnect_model(ns_uuid) + + try: + self.log.debug("Destroying model {}".format(ns_uuid)) + await self.controller.destroy_models(ns_uuid) + except JujuError: + raise NetworkServiceDoesNotExist( + "The Network Service '{}' does not exist".format(ns_uuid) + ) + + return True async def GetMetrics(self, model_name, application_name): """Get the metrics collected by the VCA. - :param model_name The name of the model + :param model_name The name or unique id of the network service :param application_name The name of the application """ metrics = {} @@ -532,24 +1085,62 @@ class N2VC: return metrics + async def HasApplication(self, model_name, application_name): + model = await self.get_model(model_name) + app = await self.get_application(model, application_name) + if app: + return True + return False + + async def Subscribe(self, ns_name, application_name, callback, *callback_args): + """Subscribe to callbacks for an application. + + :param ns_name str: The name of the Network Service + :param application_name str: The name of the application + :param callback obj: The callback method + :param callback_args list: The list of arguments to append to calls to + the callback method + """ + self.monitors[ns_name].AddApplication( + application_name, callback, *callback_args + ) + + async def Unsubscribe(self, ns_name, application_name): + """Unsubscribe to callbacks for an application. + + Unsubscribes the caller from notifications from a deployed application. + + :param ns_name str: The name of the Network Service + :param application_name str: The name of the application + """ + self.monitors[ns_name].RemoveApplication(application_name,) + # Non-public methods - async def add_relation(self, a, b, via=None): + async def add_relation(self, model_name, relation1, relation2): """ Add a relation between two application endpoints. - :param a An application endpoint - :param b An application endpoint - :param via The egress subnet(s) for outbound traffic, e.g., - (192.168.0.0/16,10.0.0.0/8) + :param str model_name: The name or unique id of the network service + :param str relation1: '[:]' + :param str relation2: '[:]' """ + if not self.authenticated: await self.login() - m = await self.get_model() + m = await self.get_model(model_name) try: - m.add_relation(a, b, via) - finally: - await m.disconnect() + await m.add_relation(relation1, relation2) + except JujuAPIError as e: + # If one of the applications in the relationship doesn't exist, + # or the relation has already been added, let the operation fail + # silently. + if "not found" in e.message: + return + if "already exists" in e.message: + return + + raise e # async def apply_config(self, config, application): # """Apply a configuration to the application.""" @@ -569,38 +1160,76 @@ class N2VC: """ config = {} for primitive in config_primitive: - if primitive['name'] == 'config': + if primitive["name"] == "config": # config = self._map_primitive_parameters() - for parameter in primitive['parameter']: - param = str(parameter['name']) - if parameter['value'] == "": - config[param] = str(values[parameter['value']]) + for parameter in primitive["parameter"]: + param = str(parameter["name"]) + if parameter["value"] == "": + config[param] = str(values[parameter["value"]]) else: - config[param] = str(parameter['value']) + config[param] = str(parameter["value"]) return config - def _map_primitive_parameters(self, parameters, values): + def _map_primitive_parameters(self, parameters, user_values): params = {} for parameter in parameters: - param = str(parameter['name']) - if parameter['value'] == "": - params[param] = str(values[parameter['value']]) - else: - params[param] = str(parameter['value']) + param = str(parameter["name"]) + value = parameter.get("value") + + # map parameters inside a < >; e.g. . with the provided user + # _values. + # Must exist at user_values except if there is a default value + if isinstance(value, str) and value.startswith("<") and value.endswith(">"): + if parameter["value"][1:-1] in user_values: + value = user_values[parameter["value"][1:-1]] + elif "default-value" in parameter: + value = parameter["default-value"] + else: + raise KeyError( + "parameter {}='{}' not supplied ".format(param, value) + ) + + # If there's no value, use the default-value (if set) + if value is None and "default-value" in parameter: + value = parameter["default-value"] + + # Typecast parameter value, if present + paramtype = "string" + try: + if "data-type" in parameter: + paramtype = str(parameter["data-type"]).lower() + + if paramtype == "integer": + value = int(value) + elif paramtype == "boolean": + value = bool(value) + else: + value = str(value) + else: + # If there's no data-type, assume the value is a string + value = str(value) + except ValueError: + raise ValueError( + "parameter {}='{}' cannot be converted to type {}".format( + param, value, paramtype + ) + ) + + params[param] = value return params def _get_config_from_yang(self, config_primitive, values): """Transform the yang config primitive to dict.""" config = {} for primitive in config_primitive.values(): - if primitive['name'] == 'config': - for parameter in primitive['parameter'].values(): - param = str(parameter['name']) - if parameter['value'] == "": - config[param] = str(values[parameter['value']]) + if primitive["name"] == "config": + for parameter in primitive["parameter"].values(): + param = str(parameter["name"]) + if parameter["value"] == "": + config[param] = str(values[parameter["value"]]) else: - config[param] = str(parameter['value']) + config[param] = str(parameter["value"]) return config @@ -619,7 +1248,6 @@ class N2VC: FormatApplicationName("ping_pong_ns", "ping_vnf", "a") """ - appname = "" for c in "-".join(list(args)): if c.isdigit(): @@ -627,8 +1255,7 @@ class N2VC: elif not c.isalpha(): c = "-" appname += c - return re.sub('\-+', '-', appname.lower()) - + return re.sub("-+", "-", appname.lower()) # def format_application_name(self, nsd_name, vnfr_name, member_vnf_index=0): # """Format the name of the application @@ -653,7 +1280,7 @@ class N2VC: Model names may only contain lowercase letters, digits and hyphens """ - return name.replace('_', '-').lower() + return name.replace("_", "-").lower() async def get_application(self, model, application): """Get the deployed application.""" @@ -668,7 +1295,7 @@ class N2VC: return app - async def get_model(self, model_name='default'): + async def get_model(self, model_name): """Get a model from the Juju Controller. Note: Model objects returned must call disconnected() before it goes @@ -677,14 +1304,37 @@ class N2VC: await self.login() if model_name not in self.models: - print("connecting to model {}".format(model_name)) - self.models[model_name] = await self.controller.get_model(model_name) + # Get the models in the controller + models = await self.controller.list_models() + + if model_name not in models: + try: + self.models[model_name] = await self.controller.add_model( + model_name, config={"authorized-keys": self.juju_public_key} + ) + except JujuError as e: + if "already exists" not in e.message: + raise e + else: + self.models[model_name] = await self.controller.get_model(model_name) + + self.refcount["model"] += 1 # Create an observer for this model + await self.create_model_monitor(model_name) + + return self.models[model_name] + + async def create_model_monitor(self, model_name): + """Create a monitor for the model, if none exists.""" + if not self.authenticated: + await self.login() + + if model_name not in self.monitors: self.monitors[model_name] = VCAMonitor(model_name) self.models[model_name].add_observer(self.monitors[model_name]) - return self.models[model_name] + return True async def login(self): """Login to the Juju controller.""" @@ -696,17 +1346,26 @@ class N2VC: self.log.debug("JujuApi: Logging into controller") - cacert = None - self.controller = Controller() + self.controller = Controller(loop=self.loop) if self.secret: - self.log.debug("Connecting to controller... ws://{}:{} as {}/{}".format(self.endpoint, self.port, self.user, self.secret)) - await self.controller.connect( - endpoint=self.endpoint, - username=self.user, - password=self.secret, - cacert=cacert, + self.log.debug( + "Connecting to controller... ws://{} as {}/{}".format( + self.endpoint, self.user, self.secret, + ) ) + try: + await self.controller.connect( + endpoint=self.endpoint, + username=self.user, + password=self.secret, + cacert=self.ca_cert, + ) + self.refcount["controller"] += 1 + self.authenticated = True + self.log.debug("JujuApi: Logged into controller") + except Exception as ex: + self.log.debug("Caught exception: {}".format(ex)) else: # current_controller no longer exists # self.log.debug("Connecting to current controller...") @@ -717,36 +1376,109 @@ class N2VC: # cacert=cacert, # ) self.log.fatal("VCA credentials not configured.") - - self.authenticated = True - self.log.debug("JujuApi: Logged into controller") - - # self.default_model = await self.controller.get_model("default") + self.authenticated = False async def logout(self): """Logout of the Juju controller.""" if not self.authenticated: - return + return False try: - if self.default_model: - self.log.debug("Disconnecting model {}".format(self.default_model)) - await self.default_model.disconnect() - self.default_model = None - for model in self.models: - await self.models[model].disconnect() + await self.disconnect_model(model) if self.controller: self.log.debug("Disconnecting controller {}".format(self.controller)) await self.controller.disconnect() - # self.controller = None + self.refcount["controller"] -= 1 + self.controller = None self.authenticated = False + + self.log.debug(self.refcount) + except Exception as e: - self.log.fail("Fatal error logging out of Juju Controller: {}".format(e)) + self.log.fatal("Fatal error logging out of Juju Controller: {}".format(e)) raise e + return True + + async def disconnect_model(self, model): + self.log.debug("Disconnecting model {}".format(model)) + if model in self.models: + try: + await self.models[model].disconnect() + self.refcount["model"] -= 1 + self.models[model] = None + except Exception as e: + self.log.debug("Caught exception: {}".format(e)) + + async def provision_machine( + self, model_name: str, hostname: str, username: str, private_key_path: str + ) -> int: + """Provision a machine. + + This executes the SSH provisioner, which will log in to a machine via + SSH and prepare it for use with the Juju model + + :param model_name str: The name of the model + :param hostname str: The IP or hostname of the target VM + :param user str: The username to login to + :param private_key_path str: The path to the private key that's been injected + to the VM via cloud-init + :return machine_id int: Returns the id of the machine or None if provisioning + fails + """ + if not self.authenticated: + await self.login() + machine_id = None + + if self.api_proxy: + self.log.debug( + "Instantiating SSH Provisioner for {}@{} ({})".format( + username, hostname, private_key_path + ) + ) + provisioner = SSHProvisioner( + host=hostname, + user=username, + private_key_path=private_key_path, + log=self.log, + ) + + params = None + try: + params = provisioner.provision_machine() + except Exception as ex: + self.log.debug("caught exception from provision_machine: {}".format(ex)) + return None + + if params: + params.jobs = ["JobHostUnits"] + + model = await self.get_model(model_name) + + connection = model.connection() + + # Submit the request. + self.log.debug("Adding machine to model") + client_facade = client.ClientFacade.from_connection(connection) + results = await client_facade.AddMachines(params=[params]) + error = results.machines[0].error + if error: + raise ValueError("Error adding machine: %s" % error.message) + + machine_id = results.machines[0].machine + + # Need to run this after AddMachines has been called, + # as we need the machine_id + self.log.debug("Installing Juju agent") + await provisioner.install_agent( + connection, params.nonce, machine_id, self.api_proxy, + ) + else: + self.log.debug("Missing API Proxy") + return machine_id # async def remove_application(self, name): # """Remove the application.""" @@ -771,56 +1503,56 @@ class N2VC: if not self.authenticated: await self.login() - m = await self.get_model() - try: - m.remove_relation(a, b) - finally: - await m.disconnect() + # m = await self.get_model() + # try: + # m.remove_relation(a, b) + # finally: + # await m.disconnect() - async def resolve_error(self, application=None): + async def resolve_error(self, model_name, application=None): """Resolve units in error state.""" if not self.authenticated: await self.login() - app = await self.get_application(self.default_model, application) + model = await self.get_model(model_name) + + app = await self.get_application(model, application) if app: - self.log.debug("JujuApi: Resolving errors for application {}".format( - application, - )) + self.log.debug( + "JujuApi: Resolving errors for application {}".format(application,) + ) - for unit in app.units: + for _ in app.units: app.resolved(retry=True) - async def run_action(self, application, action_name, **params): + async def run_action(self, model_name, application, action_name, **params): """Execute an action and return an Action object.""" if not self.authenticated: await self.login() - result = { - 'status': '', - 'action': { - 'tag': None, - 'results': None, - } - } - app = await self.get_application(self.default_model, application) + result = {"status": "", "action": {"tag": None, "results": None}} + + model = await self.get_model(model_name) + + app = await self.get_application(model, application) if app: # We currently only have one unit per application # so use the first unit available. unit = app.units[0] - self.log.debug("JujuApi: Running Action {} against Application {}".format( - action_name, - application, - )) + self.log.debug( + "JujuApi: Running Action {} against Application {}".format( + action_name, application, + ) + ) action = await unit.run_action(action_name, **params) # Wait for the action to complete await action.wait() - result['status'] = action.status - result['action']['tag'] = action.data['id'] - result['action']['results'] = action.results + result["status"] = action.status + result["action"]["tag"] = action.data["id"] + result["action"]["results"] = action.results return result @@ -831,16 +1563,20 @@ class N2VC: app = await self.get_application(model_name, application) if app: - self.log.debug("JujuApi: Setting config for Application {}".format( - application, - )) + self.log.debug( + "JujuApi: Setting config for Application {}".format(application,) + ) await app.set_config(config) # Verify the config is set newconf = await app.get_config() for key in config: - if config[key] != newconf[key]['value']: - self.log.debug("JujuApi: Config not set! Key {} Value {} doesn't match {}".format(key, config[key], newconf[key])) + if config[key] != newconf[key]["value"]: + self.log.debug( + ( + "JujuApi: Config not set! Key {} Value {} doesn't match {}" + ).format(key, config[key], newconf[key]) + ) # async def set_parameter(self, parameter, value, application=None): # """Set a config parameter for a service.""" @@ -855,27 +1591,29 @@ class N2VC: # return await self.apply_config( # {parameter: value}, # application=application, - # ) + # ) - async def wait_for_application(self, name, timeout=300): + async def wait_for_application(self, model_name, application_name, timeout=300): """Wait for an application to become active.""" if not self.authenticated: await self.login() - app = await self.get_application(self.default_model, name) + model = await self.get_model(model_name) + + app = await self.get_application(model, application_name) + self.log.debug("Application: {}".format(app)) if app: self.log.debug( "JujuApi: Waiting {} seconds for Application {}".format( - timeout, - name, + timeout, application_name, ) ) - await self.default_model.block_until( + await model.block_until( lambda: all( - unit.agent_status == 'idle' - and unit.workload_status - in ['active', 'unknown'] for unit in app.units + unit.agent_status == "idle" + and unit.workload_status in ["active", "unknown"] + for unit in app.units ), - timeout=timeout + timeout=timeout, )