| """ |
| Copyright (c) 2015 SONATA-NFV and Paderborn University |
| ALL RIGHTS RESERVED. |
| |
| 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. |
| |
| Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION] |
| nor the names of its contributors may be used to endorse or promote |
| products derived from this software without specific prior written |
| permission. |
| |
| This work has been performed in the framework of the SONATA project, |
| funded by the European Commission under Grant number 671517 through |
| the Horizon 2020 and 5G-PPP programmes. The authors would like to |
| acknowledge the contributions of their colleagues of the SONATA |
| partner consortium (www.sonata-nfv.eu). |
| """ |
| """ |
| This module implements a simple REST API that behaves like SONATA's gatekeeper. |
| |
| It is only used to support the development of SONATA's SDK tools and to demonstrate |
| the year 1 version of the emulator until the integration with WP4's orchestrator is done. |
| """ |
| |
| import logging |
| import os |
| import uuid |
| import hashlib |
| import zipfile |
| import yaml |
| import threading |
| from docker import DockerClient, APIClient |
| from flask import Flask, request |
| import flask_restful as fr |
| from collections import defaultdict |
| import pkg_resources |
| from subprocess import Popen |
| from random import randint |
| import ipaddress |
| |
| logging.basicConfig() |
| LOG = logging.getLogger("sonata-dummy-gatekeeper") |
| LOG.setLevel(logging.DEBUG) |
| logging.getLogger("werkzeug").setLevel(logging.WARNING) |
| |
| GK_STORAGE = "/tmp/son-dummy-gk/" |
| UPLOAD_FOLDER = os.path.join(GK_STORAGE, "uploads/") |
| CATALOG_FOLDER = os.path.join(GK_STORAGE, "catalog/") |
| |
| # Enable Dockerfile build functionality |
| BUILD_DOCKERFILE = False |
| |
| # flag to indicate that we run without the emulator (only the bare API for integration testing) |
| GK_STANDALONE_MODE = False |
| |
| # should a new version of an image be pulled even if its available |
| FORCE_PULL = False |
| |
| # Automatically deploy SAPs (endpoints) of the service as new containers |
| # Attention: This is not a configuration switch but a global variable! Don't change its default value. |
| DEPLOY_SAP = False |
| |
| # flag to indicate if we use bidirectional forwarding rules in the automatic chaining process |
| BIDIRECTIONAL_CHAIN = False |
| |
| # override the management interfaces in the descriptors with default docker0 interfaces in the containers |
| USE_DOCKER_MGMT = True |
| |
| def generate_subnets(prefix, base, subnet_size=50, mask=24): |
| # Generate a list of ipaddress in subnets |
| r = list() |
| for net in range(base, base + subnet_size): |
| subnet = "{0}.{1}.0/{2}".format(prefix, net, mask) |
| r.append(ipaddress.ip_network(unicode(subnet))) |
| return r |
| # private subnet definitions for the generated interfaces |
| # 10.10.xxx.0/24 |
| SAP_SUBNETS = generate_subnets('10.10', 0, subnet_size=50, mask=30) |
| # 10.20.xxx.0/30 |
| ELAN_SUBNETS = generate_subnets('10.20', 0, subnet_size=50, mask=24) |
| # 10.30.xxx.0/30 |
| ELINE_SUBNETS = generate_subnets('10.30', 0, subnet_size=50, mask=30) |
| |
| |
| class Gatekeeper(object): |
| |
| def __init__(self): |
| self.services = dict() |
| self.dcs = dict() |
| self.net = None |
| self.vnf_counter = 0 # used to generate short names for VNFs (Mininet limitation) |
| LOG.info("Create SONATA dummy gatekeeper.") |
| |
| def register_service_package(self, service_uuid, service): |
| """ |
| register new service package |
| :param service_uuid |
| :param service object |
| """ |
| self.services[service_uuid] = service |
| # lets perform all steps needed to onboard the service |
| service.onboard() |
| |
| def get_next_vnf_name(self): |
| self.vnf_counter += 1 |
| return "vnf%d" % self.vnf_counter |
| |
| |
| class Service(object): |
| """ |
| This class represents a NS uploaded as a *.son package to the |
| dummy gatekeeper. |
| Can have multiple running instances of this service. |
| """ |
| |
| def __init__(self, |
| service_uuid, |
| package_file_hash, |
| package_file_path): |
| self.uuid = service_uuid |
| self.package_file_hash = package_file_hash |
| self.package_file_path = package_file_path |
| self.package_content_path = os.path.join(CATALOG_FOLDER, "services/%s" % self.uuid) |
| self.manifest = None |
| self.nsd = None |
| self.vnfds = dict() |
| self.saps = dict() |
| self.saps_ext = list() |
| self.saps_int = list() |
| self.local_docker_files = dict() |
| self.remote_docker_image_urls = dict() |
| self.instances = dict() |
| self.vnf_name2docker_name = dict() |
| self.vnf_id2vnf_name = dict() |
| |
| def onboard(self): |
| """ |
| Do all steps to prepare this service to be instantiated |
| :return: |
| """ |
| # 1. extract the contents of the package and store them in our catalog |
| self._unpack_service_package() |
| # 2. read in all descriptor files |
| self._load_package_descriptor() |
| self._load_nsd() |
| self._load_vnfd() |
| if DEPLOY_SAP: |
| self._load_saps() |
| # create dict to translate vnf names |
| self.vnf_id2vnf_name = defaultdict(lambda: "NotExistingNode", |
| reduce(lambda x, y: dict(x, **y), |
| map(lambda d: {d["vnf_id"]: d["vnf_name"]}, |
| self.nsd["network_functions"]))) |
| # 3. prepare container images (e.g. download or build Dockerfile) |
| if BUILD_DOCKERFILE: |
| self._load_docker_files() |
| self._build_images_from_dockerfiles() |
| else: |
| self._load_docker_urls() |
| self._pull_predefined_dockerimages() |
| LOG.info("On-boarded service: %r" % self.manifest.get("name")) |
| |
| def start_service(self): |
| """ |
| This methods creates and starts a new service instance. |
| It computes placements, iterates over all VNFDs, and starts |
| each VNFD as a Docker container in the data center selected |
| by the placement algorithm. |
| :return: |
| """ |
| LOG.info("Starting service %r" % self.uuid) |
| |
| # 1. each service instance gets a new uuid to identify it |
| instance_uuid = str(uuid.uuid4()) |
| # build a instances dict (a bit like a NSR :)) |
| self.instances[instance_uuid] = dict() |
| self.instances[instance_uuid]["vnf_instances"] = list() |
| |
| # 2. compute placement of this service instance (adds DC names to VNFDs) |
| if not GK_STANDALONE_MODE: |
| #self._calculate_placement(FirstDcPlacement) |
| self._calculate_placement(RoundRobinDcPlacementWithSAPs) |
| |
| # 3. start all vnfds that we have in the service (except SAPs) |
| for vnfd in self.vnfds.itervalues(): |
| vnfi = None |
| if not GK_STANDALONE_MODE: |
| vnfi = self._start_vnfd(vnfd) |
| self.instances[instance_uuid]["vnf_instances"].append(vnfi) |
| |
| # 4. start all SAPs in the service |
| for sap in self.saps: |
| self._start_sap(self.saps[sap], instance_uuid) |
| |
| # 5. Deploy E-Line and E_LAN links |
| if "virtual_links" in self.nsd: |
| vlinks = self.nsd["virtual_links"] |
| # constituent virtual links are not checked |
| #fwd_links = self.nsd["forwarding_graphs"][0]["constituent_virtual_links"] |
| eline_fwd_links = [l for l in vlinks if (l["connectivity_type"] == "E-Line")] |
| elan_fwd_links = [l for l in vlinks if (l["connectivity_type"] == "E-LAN")] |
| |
| GK.net.deployed_elines.extend(eline_fwd_links) |
| GK.net.deployed_elans.extend(elan_fwd_links) |
| |
| # 5a. deploy E-Line links |
| self._connect_elines(eline_fwd_links, instance_uuid) |
| |
| # 5b. deploy E-LAN links |
| self._connect_elans(elan_fwd_links, instance_uuid) |
| |
| # 6. run the emulator specific entrypoint scripts in the VNFIs of this service instance |
| self._trigger_emulator_start_scripts_in_vnfis(self.instances[instance_uuid]["vnf_instances"]) |
| |
| LOG.info("Service started. Instance id: %r" % instance_uuid) |
| return instance_uuid |
| |
| def stop_service(self, instance_uuid): |
| """ |
| This method stops a running service instance. |
| It iterates over all VNF instances, stopping them each |
| and removing them from their data center. |
| |
| :param instance_uuid: the uuid of the service instance to be stopped |
| """ |
| LOG.info("Stopping service %r" % self.uuid) |
| # get relevant information |
| # instance_uuid = str(self.uuid.uuid4()) |
| vnf_instances = self.instances[instance_uuid]["vnf_instances"] |
| |
| for v in vnf_instances: |
| self._stop_vnfi(v) |
| |
| if not GK_STANDALONE_MODE: |
| # remove placement? |
| # self._remove_placement(RoundRobinPlacement) |
| None |
| |
| # last step: remove the instance from the list of all instances |
| del self.instances[instance_uuid] |
| |
| def _start_vnfd(self, vnfd): |
| """ |
| Start a single VNFD of this service |
| :param vnfd: vnfd descriptor dict |
| :return: |
| """ |
| # iterate over all deployment units within each VNFDs |
| for u in vnfd.get("virtual_deployment_units"): |
| # 1. get the name of the docker image to start and the assigned DC |
| vnf_name = vnfd.get("name") |
| if vnf_name not in self.remote_docker_image_urls: |
| raise Exception("No image name for %r found. Abort." % vnf_name) |
| docker_name = self.remote_docker_image_urls.get(vnf_name) |
| target_dc = vnfd.get("dc") |
| # 2. perform some checks to ensure we can start the container |
| assert(docker_name is not None) |
| assert(target_dc is not None) |
| if not self._check_docker_image_exists(docker_name): |
| raise Exception("Docker image %r not found. Abort." % docker_name) |
| |
| # 3. get the resource limits |
| res_req = u.get("resource_requirements") |
| cpu_list = res_req.get("cpu").get("cores") |
| if not cpu_list or len(cpu_list)==0: |
| cpu_list="1" |
| cpu_bw = res_req.get("cpu").get("cpu_bw") |
| if not cpu_bw: |
| cpu_bw=1 |
| mem_num = str(res_req.get("memory").get("size")) |
| if len(mem_num)==0: |
| mem_num="2" |
| mem_unit = str(res_req.get("memory").get("size_unit")) |
| if str(mem_unit)==0: |
| mem_unit="GB" |
| mem_limit = float(mem_num) |
| if mem_unit=="GB": |
| mem_limit=mem_limit*1024*1024*1024 |
| elif mem_unit=="MB": |
| mem_limit=mem_limit*1024*1024 |
| elif mem_unit=="KB": |
| mem_limit=mem_limit*1024 |
| mem_lim = int(mem_limit) |
| cpu_period, cpu_quota = self._calculate_cpu_cfs_values(float(cpu_bw)) |
| |
| vnf_name2id = defaultdict(lambda: "NotExistingNode", |
| reduce(lambda x, y: dict(x, **y), |
| map(lambda d: {d["vnf_name"]: d["vnf_id"]}, |
| self.nsd["network_functions"]))) |
| |
| # check if we need to deploy the management ports (defined as type:management both on in the vnfd and nsd) |
| intfs = vnfd.get("connection_points", []) |
| mgmt_intf_names = [] |
| if USE_DOCKER_MGMT: |
| vnf_id = vnf_name2id[vnf_name] |
| mgmt_intfs = [vnf_id + ':' + intf['id'] for intf in intfs if intf.get('type') == 'management'] |
| # check if any of these management interfaces are used in a management-type network in the nsd |
| for nsd_intf_name in mgmt_intfs: |
| vlinks = [ l["connection_points_reference"] for l in self.nsd.get("virtual_links", [])] |
| for link in vlinks: |
| if nsd_intf_name in link and self.check_mgmt_interface(link): |
| # this is indeed a management interface and can be skipped |
| vnf_id, vnf_interface, vnf_sap_docker_name = parse_interface(nsd_intf_name) |
| found_interfaces = [intf for intf in intfs if intf.get('id') == vnf_interface] |
| intfs.remove(found_interfaces[0]) |
| mgmt_intf_names.append(vnf_interface) |
| |
| # 4. generate the volume paths for the docker container |
| volumes=list() |
| # a volume to extract log files |
| docker_log_path = "/tmp/results/%s/%s"%(self.uuid,vnf_name) |
| LOG.debug("LOG path for vnf %s is %s."%(vnf_name,docker_log_path)) |
| if not os.path.exists(docker_log_path): |
| LOG.debug("Creating folder %s"%docker_log_path) |
| os.makedirs(docker_log_path) |
| |
| volumes.append(docker_log_path+":/mnt/share/") |
| |
| |
| # 5. do the dc.startCompute(name="foobar") call to run the container |
| # TODO consider flavors, and other annotations |
| # TODO: get all vnf id's from the nsd for this vnfd and use those as dockername |
| # use the vnf_id in the nsd as docker name |
| # so deployed containers can be easily mapped back to the nsd |
| |
| self.vnf_name2docker_name[vnf_name] = vnf_name2id[vnf_name] |
| |
| LOG.info("Starting %r as %r in DC %r" % (vnf_name, self.vnf_name2docker_name[vnf_name], vnfd.get("dc"))) |
| LOG.debug("Interfaces for %r: %r" % (vnf_name, intfs)) |
| vnfi = target_dc.startCompute( |
| self.vnf_name2docker_name[vnf_name], |
| network=intfs, |
| image=docker_name, |
| flavor_name="small", |
| cpu_quota=cpu_quota, |
| cpu_period=cpu_period, |
| cpuset=cpu_list, |
| mem_limit=mem_lim, |
| volumes=volumes) |
| |
| # rename the docker0 interfaces (eth0) to the management port name defined in the VNFD |
| if USE_DOCKER_MGMT: |
| for intf_name in mgmt_intf_names: |
| self._vnf_reconfigure_network(vnfi, 'eth0', new_name=intf_name) |
| |
| return vnfi |
| |
| def _stop_vnfi(self, vnfi): |
| """ |
| Stop a VNF instance. |
| |
| :param vnfi: vnf instance to be stopped |
| """ |
| # Find the correct datacenter |
| status = vnfi.getStatus() |
| dc = vnfi.datacenter |
| |
| # stop the vnfi |
| LOG.info("Stopping the vnf instance contained in %r in DC %r" % (status["name"], dc)) |
| dc.stopCompute(status["name"]) |
| |
| def _get_vnf_instance(self, instance_uuid, name): |
| """ |
| Returns the Docker object for the given VNF name (or Docker name). |
| :param instance_uuid: UUID of the service instance to search in. |
| :param name: VNF name or Docker name. We are fuzzy here. |
| :return: |
| """ |
| dn = name |
| if name in self.vnf_name2docker_name: |
| dn = self.vnf_name2docker_name[name] |
| for vnfi in self.instances[instance_uuid]["vnf_instances"]: |
| if vnfi.name == dn: |
| return vnfi |
| LOG.warning("No container with name: {0} found.".format(dn)) |
| return None |
| |
| @staticmethod |
| def _vnf_reconfigure_network(vnfi, if_name, net_str=None, new_name=None): |
| """ |
| Reconfigure the network configuration of a specific interface |
| of a running container. |
| :param vnfi: container instance |
| :param if_name: interface name |
| :param net_str: network configuration string, e.g., 1.2.3.4/24 |
| :return: |
| """ |
| |
| # assign new ip address |
| if net_str is not None: |
| intf = vnfi.intf(intf=if_name) |
| if intf is not None: |
| intf.setIP(net_str) |
| LOG.debug("Reconfigured network of %s:%s to %r" % (vnfi.name, if_name, net_str)) |
| else: |
| LOG.warning("Interface not found: %s:%s. Network reconfiguration skipped." % (vnfi.name, if_name)) |
| |
| if new_name is not None: |
| vnfi.cmd('ip link set', if_name, 'down') |
| vnfi.cmd('ip link set', if_name, 'name', new_name) |
| vnfi.cmd('ip link set', new_name, 'up') |
| LOG.debug("Reconfigured interface name of %s:%s to %s" % (vnfi.name, if_name, new_name)) |
| |
| |
| |
| def _trigger_emulator_start_scripts_in_vnfis(self, vnfi_list): |
| for vnfi in vnfi_list: |
| config = vnfi.dcinfo.get("Config", dict()) |
| env = config.get("Env", list()) |
| for env_var in env: |
| var, cmd = map(str.strip, map(str, env_var.split('=', 1))) |
| LOG.debug("%r = %r" % (var , cmd)) |
| if var=="SON_EMU_CMD": |
| LOG.info("Executing entry point script in %r: %r" % (vnfi.name, cmd)) |
| # execute command in new thread to ensure that GK is not blocked by VNF |
| t = threading.Thread(target=vnfi.cmdPrint, args=(cmd,)) |
| t.daemon = True |
| t.start() |
| |
| def _unpack_service_package(self): |
| """ |
| unzip *.son file and store contents in CATALOG_FOLDER/services/<service_uuid>/ |
| """ |
| LOG.info("Unzipping: %r" % self.package_file_path) |
| with zipfile.ZipFile(self.package_file_path, "r") as z: |
| z.extractall(self.package_content_path) |
| |
| |
| def _load_package_descriptor(self): |
| """ |
| Load the main package descriptor YAML and keep it as dict. |
| :return: |
| """ |
| self.manifest = load_yaml( |
| os.path.join( |
| self.package_content_path, "META-INF/MANIFEST.MF")) |
| |
| def _load_nsd(self): |
| """ |
| Load the entry NSD YAML and keep it as dict. |
| :return: |
| """ |
| if "entry_service_template" in self.manifest: |
| nsd_path = os.path.join( |
| self.package_content_path, |
| make_relative_path(self.manifest.get("entry_service_template"))) |
| self.nsd = load_yaml(nsd_path) |
| GK.net.deployed_nsds.append(self.nsd) |
| |
| LOG.debug("Loaded NSD: %r" % self.nsd.get("name")) |
| |
| def _load_vnfd(self): |
| """ |
| Load all VNFD YAML files referenced in MANIFEST.MF and keep them in dict. |
| :return: |
| """ |
| if "package_content" in self.manifest: |
| for pc in self.manifest.get("package_content"): |
| if pc.get("content-type") == "application/sonata.function_descriptor": |
| vnfd_path = os.path.join( |
| self.package_content_path, |
| make_relative_path(pc.get("name"))) |
| vnfd = load_yaml(vnfd_path) |
| self.vnfds[vnfd.get("name")] = vnfd |
| LOG.debug("Loaded VNFD: %r" % vnfd.get("name")) |
| |
| def _load_saps(self): |
| # create list of all SAPs |
| # check if we need to deploy management ports |
| if USE_DOCKER_MGMT: |
| LOG.debug("nsd: {0}".format(self.nsd)) |
| SAPs = [p for p in self.nsd["connection_points"] if 'management' not in p.get('type')] |
| else: |
| SAPs = [p for p in self.nsd["connection_points"]] |
| |
| for sap in SAPs: |
| # endpoint needed in this service |
| sap_id, sap_interface, sap_docker_name = parse_interface(sap['id']) |
| # make sure SAP has type set (default internal) |
| sap["type"] = sap.get("type", 'internal') |
| |
| # Each Service Access Point (connection_point) in the nsd is an IP address on the host |
| if sap["type"] == "external": |
| # add to vnfds to calculate placement later on |
| sap_net = SAP_SUBNETS.pop(0) |
| self.saps[sap_docker_name] = {"name": sap_docker_name , "type": "external", "net": sap_net} |
| # add SAP vnf to list in the NSD so it is deployed later on |
| # each SAP get a unique VNFD and vnf_id in the NSD and custom type (only defined in the dummygatekeeper) |
| self.nsd["network_functions"].append( |
| {"vnf_id": sap_docker_name, "vnf_name": sap_docker_name, "vnf_type": "sap_ext"}) |
| |
| # Each Service Access Point (connection_point) in the nsd is getting its own container (default) |
| elif sap["type"] == "internal" or sap["type"] == "management": |
| # add SAP to self.vnfds |
| sapfile = pkg_resources.resource_filename(__name__, "sap_vnfd.yml") |
| sap_vnfd = load_yaml(sapfile) |
| sap_vnfd["connection_points"][0]["id"] = sap_interface |
| sap_vnfd["name"] = sap_docker_name |
| sap_vnfd["type"] = "internal" |
| # add to vnfds to calculate placement later on and deploy |
| self.saps[sap_docker_name] = sap_vnfd |
| # add SAP vnf to list in the NSD so it is deployed later on |
| # each SAP get a unique VNFD and vnf_id in the NSD |
| self.nsd["network_functions"].append( |
| {"vnf_id": sap_docker_name, "vnf_name": sap_docker_name, "vnf_type": "sap_int"}) |
| |
| LOG.debug("Loaded SAP: name: {0}, type: {1}".format(sap_docker_name, sap['type'])) |
| |
| # create sap lists |
| self.saps_ext = [self.saps[sap]['name'] for sap in self.saps if self.saps[sap]["type"] == "external"] |
| self.saps_int = [self.saps[sap]['name'] for sap in self.saps if self.saps[sap]["type"] == "internal"] |
| |
| def _start_sap(self, sap, instance_uuid): |
| if not DEPLOY_SAP: |
| return |
| |
| LOG.info('start SAP: {0} ,type: {1}'.format(sap['name'],sap['type'])) |
| if sap["type"] == "internal": |
| vnfi = None |
| if not GK_STANDALONE_MODE: |
| vnfi = self._start_vnfd(sap) |
| self.instances[instance_uuid]["vnf_instances"].append(vnfi) |
| |
| elif sap["type"] == "external": |
| target_dc = sap.get("dc") |
| # add interface to dc switch |
| target_dc.attachExternalSAP(sap['name'], sap['net']) |
| |
| def _connect_elines(self, eline_fwd_links, instance_uuid): |
| """ |
| Connect all E-LINE links in the NSD |
| :param eline_fwd_links: list of E-LINE links in the NSD |
| :param: instance_uuid of the service |
| :return: |
| """ |
| # cookie is used as identifier for the flowrules installed by the dummygatekeeper |
| # eg. different services get a unique cookie for their flowrules |
| cookie = 1 |
| for link in eline_fwd_links: |
| # check if we need to deploy this link when its a management link: |
| if USE_DOCKER_MGMT: |
| if self.check_mgmt_interface(link["connection_points_reference"]): |
| continue |
| |
| src_id, src_if_name, src_sap_id = parse_interface(link["connection_points_reference"][0]) |
| dst_id, dst_if_name, dst_sap_id = parse_interface(link["connection_points_reference"][1]) |
| |
| setChaining = False |
| # check if there is a SAP in the link and chain everything together |
| if src_sap_id in self.saps and dst_sap_id in self.saps: |
| LOG.info('2 SAPs cannot be chained together : {0} - {1}'.format(src_sap_id, dst_sap_id)) |
| continue |
| |
| elif src_sap_id in self.saps_ext: |
| src_id = src_sap_id |
| # set intf name to None so the chaining function will choose the first one |
| src_if_name = None |
| src_name = self.vnf_id2vnf_name[src_id] |
| dst_name = self.vnf_id2vnf_name[dst_id] |
| dst_vnfi = self._get_vnf_instance(instance_uuid, dst_name) |
| if dst_vnfi is not None: |
| # choose first ip address in sap subnet |
| sap_net = self.saps[src_sap_id]['net'] |
| sap_ip = "{0}/{1}".format(str(sap_net[2]), sap_net.prefixlen) |
| self._vnf_reconfigure_network(dst_vnfi, dst_if_name, sap_ip) |
| setChaining = True |
| |
| elif dst_sap_id in self.saps_ext: |
| dst_id = dst_sap_id |
| # set intf name to None so the chaining function will choose the first one |
| dst_if_name = None |
| src_name = self.vnf_id2vnf_name[src_id] |
| dst_name = self.vnf_id2vnf_name[dst_id] |
| src_vnfi = self._get_vnf_instance(instance_uuid, src_name) |
| if src_vnfi is not None: |
| sap_net = self.saps[dst_sap_id]['net'] |
| sap_ip = "{0}/{1}".format(str(sap_net[2]), sap_net.prefixlen) |
| self._vnf_reconfigure_network(src_vnfi, src_if_name, sap_ip) |
| setChaining = True |
| |
| # Link between 2 VNFs |
| else: |
| # make sure we use the correct sap vnf name |
| if src_sap_id in self.saps_int: |
| src_id = src_sap_id |
| if dst_sap_id in self.saps_int: |
| dst_id = dst_sap_id |
| src_name = self.vnf_id2vnf_name[src_id] |
| dst_name = self.vnf_id2vnf_name[dst_id] |
| # re-configure the VNFs IP assignment and ensure that a new subnet is used for each E-Link |
| src_vnfi = self._get_vnf_instance(instance_uuid, src_name) |
| dst_vnfi = self._get_vnf_instance(instance_uuid, dst_name) |
| if src_vnfi is not None and dst_vnfi is not None: |
| eline_net = ELINE_SUBNETS.pop(0) |
| ip1 = "{0}/{1}".format(str(eline_net[1]), eline_net.prefixlen) |
| ip2 = "{0}/{1}".format(str(eline_net[2]), eline_net.prefixlen) |
| self._vnf_reconfigure_network(src_vnfi, src_if_name, ip1) |
| self._vnf_reconfigure_network(dst_vnfi, dst_if_name, ip2) |
| setChaining = True |
| |
| # Set the chaining |
| if setChaining: |
| ret = GK.net.setChain( |
| src_id, dst_id, |
| vnf_src_interface=src_if_name, vnf_dst_interface=dst_if_name, |
| bidirectional=BIDIRECTIONAL_CHAIN, cmd="add-flow", cookie=cookie, priority=10) |
| LOG.debug( |
| "Setting up E-Line link. %s(%s:%s) -> %s(%s:%s)" % ( |
| src_name, src_id, src_if_name, dst_name, dst_id, dst_if_name)) |
| |
| |
| def _connect_elans(self, elan_fwd_links, instance_uuid): |
| """ |
| Connect all E-LAN links in the NSD |
| :param elan_fwd_links: list of E-LAN links in the NSD |
| :param: instance_uuid of the service |
| :return: |
| """ |
| for link in elan_fwd_links: |
| # check if we need to deploy this link when its a management link: |
| if USE_DOCKER_MGMT: |
| if self.check_mgmt_interface(link["connection_points_reference"]): |
| continue |
| |
| elan_vnf_list = [] |
| # check if an external SAP is in the E-LAN (then a subnet is already defined) |
| intfs_elan = [intf for intf in link["connection_points_reference"]] |
| lan_sap = self.check_ext_saps(intfs_elan) |
| if lan_sap: |
| lan_net = self.saps[lan_sap]['net'] |
| lan_hosts = list(lan_net.hosts()) |
| sap_ip = str(lan_hosts.pop(0)) |
| else: |
| lan_net = ELAN_SUBNETS.pop(0) |
| lan_hosts = list(lan_net.hosts()) |
| |
| # generate lan ip address for all interfaces except external SAPs |
| for intf in link["connection_points_reference"]: |
| |
| # skip external SAPs, they already have an ip |
| vnf_id, vnf_interface, vnf_sap_docker_name = parse_interface(intf) |
| if vnf_sap_docker_name in self.saps_ext: |
| elan_vnf_list.append({'name': vnf_sap_docker_name, 'interface': vnf_interface}) |
| continue |
| |
| ip_address = "{0}/{1}".format(str(lan_hosts.pop(0)), lan_net.prefixlen) |
| vnf_id, intf_name, vnf_sap_id = parse_interface(intf) |
| |
| # make sure we use the correct sap vnf name |
| src_docker_name = vnf_id |
| if vnf_sap_id in self.saps_int: |
| src_docker_name = vnf_sap_id |
| vnf_id = vnf_sap_id |
| |
| vnf_name = self.vnf_id2vnf_name[vnf_id] |
| LOG.debug( |
| "Setting up E-LAN interface. %s(%s:%s) -> %s" % ( |
| vnf_name, vnf_id, intf_name, ip_address)) |
| |
| if vnf_name in self.vnfds: |
| # re-configure the VNFs IP assignment and ensure that a new subnet is used for each E-LAN |
| # E-LAN relies on the learning switch capability of Ryu which has to be turned on in the topology |
| # (DCNetwork(controller=RemoteController, enable_learning=True)), so no explicit chaining is necessary. |
| vnfi = self._get_vnf_instance(instance_uuid, vnf_name) |
| if vnfi is not None: |
| self._vnf_reconfigure_network(vnfi, intf_name, ip_address) |
| # add this vnf and interface to the E-LAN for tagging |
| elan_vnf_list.append({'name': src_docker_name, 'interface': intf_name}) |
| |
| # install the VLAN tags for this E-LAN |
| GK.net.setLAN(elan_vnf_list) |
| |
| |
| def _load_docker_files(self): |
| """ |
| Get all paths to Dockerfiles from VNFDs and store them in dict. |
| :return: |
| """ |
| for k, v in self.vnfds.iteritems(): |
| for vu in v.get("virtual_deployment_units"): |
| if vu.get("vm_image_format") == "docker": |
| vm_image = vu.get("vm_image") |
| docker_path = os.path.join( |
| self.package_content_path, |
| make_relative_path(vm_image)) |
| self.local_docker_files[k] = docker_path |
| LOG.debug("Found Dockerfile (%r): %r" % (k, docker_path)) |
| |
| def _load_docker_urls(self): |
| """ |
| Get all URLs to pre-build docker images in some repo. |
| :return: |
| """ |
| # also merge sap dicts, because internal saps also need a docker container |
| all_vnfs = self.vnfds.copy() |
| all_vnfs.update(self.saps) |
| |
| for k, v in all_vnfs.iteritems(): |
| for vu in v.get("virtual_deployment_units", {}): |
| if vu.get("vm_image_format") == "docker": |
| url = vu.get("vm_image") |
| if url is not None: |
| url = url.replace("http://", "") |
| self.remote_docker_image_urls[k] = url |
| LOG.debug("Found Docker image URL (%r): %r" % (k, self.remote_docker_image_urls[k])) |
| |
| def _build_images_from_dockerfiles(self): |
| """ |
| Build Docker images for each local Dockerfile found in the package: self.local_docker_files |
| """ |
| if GK_STANDALONE_MODE: |
| return # do not build anything in standalone mode |
| dc = DockerClient() |
| LOG.info("Building %d Docker images (this may take several minutes) ..." % len(self.local_docker_files)) |
| for k, v in self.local_docker_files.iteritems(): |
| for line in dc.build(path=v.replace("Dockerfile", ""), tag=k, rm=False, nocache=False): |
| LOG.debug("DOCKER BUILD: %s" % line) |
| LOG.info("Docker image created: %s" % k) |
| |
| def _pull_predefined_dockerimages(self): |
| """ |
| If the package contains URLs to pre-build Docker images, we download them with this method. |
| """ |
| dc = DockerClient() |
| for url in self.remote_docker_image_urls.itervalues(): |
| if not FORCE_PULL: # only pull if not present (speedup for development) |
| if len(dc.images.list(name=url)) > 0: |
| LOG.debug("Image %r present. Skipping pull." % url) |
| continue |
| LOG.info("Pulling image: %r" % url) |
| # this seems to fail with latest docker api version 2.0.2 |
| # dc.images.pull(url, |
| # insecure_registry=True) |
| #using docker cli instead |
| cmd = ["docker", |
| "pull", |
| url, |
| ] |
| Popen(cmd).wait() |
| |
| |
| |
| |
| def _check_docker_image_exists(self, image_name): |
| """ |
| Query the docker service and check if the given image exists |
| :param image_name: name of the docker image |
| :return: |
| """ |
| return len(DockerClient().images.list(name=image_name)) > 0 |
| |
| def _calculate_placement(self, algorithm): |
| """ |
| Do placement by adding the a field "dc" to |
| each VNFD that points to one of our |
| data center objects known to the gatekeeper. |
| """ |
| assert(len(self.vnfds) > 0) |
| assert(len(GK.dcs) > 0) |
| # instantiate algorithm an place |
| p = algorithm() |
| p.place(self.nsd, self.vnfds, self.saps, GK.dcs) |
| LOG.info("Using placement algorithm: %r" % p.__class__.__name__) |
| # lets print the placement result |
| for name, vnfd in self.vnfds.iteritems(): |
| LOG.info("Placed VNF %r on DC %r" % (name, str(vnfd.get("dc")))) |
| for sap in self.saps: |
| sap_dict = self.saps[sap] |
| LOG.info("Placed SAP %r on DC %r" % (sap, str(sap_dict.get("dc")))) |
| |
| |
| def _calculate_cpu_cfs_values(self, cpu_time_percentage): |
| """ |
| Calculate cpu period and quota for CFS |
| :param cpu_time_percentage: percentage of overall CPU to be used |
| :return: cpu_period, cpu_quota |
| """ |
| if cpu_time_percentage is None: |
| return -1, -1 |
| if cpu_time_percentage < 0: |
| return -1, -1 |
| # (see: https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt) |
| # Attention minimum cpu_quota is 1ms (micro) |
| cpu_period = 1000000 # lets consider a fixed period of 1000000 microseconds for now |
| LOG.debug("cpu_period is %r, cpu_percentage is %r" % (cpu_period, cpu_time_percentage)) |
| cpu_quota = cpu_period * cpu_time_percentage # calculate the fraction of cpu time for this container |
| # ATTENTION >= 1000 to avoid a invalid argument system error ... no idea why |
| if cpu_quota < 1000: |
| LOG.debug("cpu_quota before correcting: %r" % cpu_quota) |
| cpu_quota = 1000 |
| LOG.warning("Increased CPU quota to avoid system error.") |
| LOG.debug("Calculated: cpu_period=%f / cpu_quota=%f" % (cpu_period, cpu_quota)) |
| return int(cpu_period), int(cpu_quota) |
| |
| def check_ext_saps(self, intf_list): |
| # check if the list of interfacs contains an externl SAP |
| saps_ext = [self.saps[sap]['name'] for sap in self.saps if self.saps[sap]["type"] == "external"] |
| for intf_name in intf_list: |
| vnf_id, vnf_interface, vnf_sap_docker_name = parse_interface(intf_name) |
| if vnf_sap_docker_name in saps_ext: |
| return vnf_sap_docker_name |
| |
| def check_mgmt_interface(self, intf_list): |
| SAPs_mgmt = [p.get('id') for p in self.nsd["connection_points"] if 'management' in p.get('type')] |
| for intf_name in intf_list: |
| if intf_name in SAPs_mgmt: |
| return True |
| |
| """ |
| Some (simple) placement algorithms |
| """ |
| |
| |
| class FirstDcPlacement(object): |
| """ |
| Placement: Always use one and the same data center from the GK.dcs dict. |
| """ |
| def place(self, nsd, vnfds, saps, dcs): |
| for name, vnfd in vnfds.iteritems(): |
| vnfd["dc"] = list(dcs.itervalues())[0] |
| |
| |
| class RoundRobinDcPlacement(object): |
| """ |
| Placement: Distribute VNFs across all available DCs in a round robin fashion. |
| """ |
| def place(self, nsd, vnfds, saps, dcs): |
| c = 0 |
| dcs_list = list(dcs.itervalues()) |
| for name, vnfd in vnfds.iteritems(): |
| vnfd["dc"] = dcs_list[c % len(dcs_list)] |
| c += 1 # inc. c to use next DC |
| |
| class RoundRobinDcPlacementWithSAPs(object): |
| """ |
| Placement: Distribute VNFs across all available DCs in a round robin fashion, |
| every SAP is instantiated on the same DC as the connected VNF. |
| """ |
| def place(self, nsd, vnfds, saps, dcs): |
| |
| # place vnfs |
| c = 0 |
| dcs_list = list(dcs.itervalues()) |
| for name, vnfd in vnfds.iteritems(): |
| vnfd["dc"] = dcs_list[c % len(dcs_list)] |
| c += 1 # inc. c to use next DC |
| |
| # place SAPs |
| vlinks = nsd.get("virtual_links", []) |
| eline_fwd_links = [l for l in vlinks if (l["connectivity_type"] == "E-Line")] |
| elan_fwd_links = [l for l in vlinks if (l["connectivity_type"] == "E-LAN")] |
| |
| vnf_id2vnf_name = defaultdict(lambda: "NotExistingNode", |
| reduce(lambda x, y: dict(x, **y), |
| map(lambda d: {d["vnf_id"]: d["vnf_name"]}, |
| nsd["network_functions"]))) |
| |
| # SAPs on E-Line links are placed on the same DC as the VNF on the E-Line |
| for link in eline_fwd_links: |
| src_id, src_if_name, src_sap_id = parse_interface(link["connection_points_reference"][0]) |
| dst_id, dst_if_name, dst_sap_id = parse_interface(link["connection_points_reference"][1]) |
| |
| # check if there is a SAP in the link |
| if src_sap_id in saps: |
| dst_vnf_name = vnf_id2vnf_name[dst_id] |
| # get dc where connected vnf is mapped to |
| dc = vnfds[dst_vnf_name]['dc'] |
| saps[src_sap_id]['dc'] = dc |
| |
| if dst_sap_id in saps: |
| src_vnf_name = vnf_id2vnf_name[src_id] |
| # get dc where connected vnf is mapped to |
| dc = vnfds[src_vnf_name]['dc'] |
| saps[dst_sap_id]['dc'] = dc |
| |
| # SAPs on E-LANs are placed on a random DC |
| dcs_list = list(dcs.itervalues()) |
| dc_len = len(dcs_list) |
| for link in elan_fwd_links: |
| for intf in link["connection_points_reference"]: |
| # find SAP interfaces |
| intf_id, intf_name, intf_sap_id = parse_interface(intf) |
| if intf_sap_id in saps: |
| dc = dcs_list[randint(0, dc_len-1)] |
| saps[intf_sap_id]['dc'] = dc |
| |
| |
| |
| """ |
| Resource definitions and API endpoints |
| """ |
| |
| |
| class Packages(fr.Resource): |
| |
| def post(self): |
| """ |
| Upload a *.son service package to the dummy gatekeeper. |
| |
| We expect request with a *.son file and store it in UPLOAD_FOLDER |
| :return: UUID |
| """ |
| try: |
| # get file contents |
| LOG.info("POST /packages called") |
| # lets search for the package in the request |
| is_file_object = False # make API more robust: file can be in data or in files field |
| if "package" in request.files: |
| son_file = request.files["package"] |
| is_file_object = True |
| elif len(request.data) > 0: |
| son_file = request.data |
| else: |
| return {"service_uuid": None, "size": 0, "sha1": None, "error": "upload failed. file not found."}, 500 |
| # generate a uuid to reference this package |
| service_uuid = str(uuid.uuid4()) |
| file_hash = hashlib.sha1(str(son_file)).hexdigest() |
| # ensure that upload folder exists |
| ensure_dir(UPLOAD_FOLDER) |
| upload_path = os.path.join(UPLOAD_FOLDER, "%s.son" % service_uuid) |
| # store *.son file to disk |
| if is_file_object: |
| son_file.save(upload_path) |
| else: |
| with open(upload_path, 'wb') as f: |
| f.write(son_file) |
| size = os.path.getsize(upload_path) |
| # create a service object and register it |
| s = Service(service_uuid, file_hash, upload_path) |
| GK.register_service_package(service_uuid, s) |
| # generate the JSON result |
| return {"service_uuid": service_uuid, "size": size, "sha1": file_hash, "error": None}, 201 |
| except Exception as ex: |
| LOG.exception("Service package upload failed:") |
| return {"service_uuid": None, "size": 0, "sha1": None, "error": "upload failed"}, 500 |
| |
| def get(self): |
| """ |
| Return a list of UUID's of uploaded service packages. |
| :return: dict/list |
| """ |
| LOG.info("GET /packages") |
| return {"service_uuid_list": list(GK.services.iterkeys())} |
| |
| |
| class Instantiations(fr.Resource): |
| |
| def post(self): |
| """ |
| Instantiate a service specified by its UUID. |
| Will return a new UUID to identify the running service instance. |
| :return: UUID |
| """ |
| LOG.info("POST /instantiations (or /requests) called") |
| # try to extract the service uuid from the request |
| json_data = request.get_json(force=True) |
| service_uuid = json_data.get("service_uuid") |
| |
| # lets be a bit fuzzy here to make testing easier |
| if (service_uuid is None or service_uuid=="latest") and len(GK.services) > 0: |
| # if we don't get a service uuid, we simple start the first service in the list |
| service_uuid = list(GK.services.iterkeys())[0] |
| if service_uuid in GK.services: |
| # ok, we have a service uuid, lets start the service |
| service_instance_uuid = GK.services.get(service_uuid).start_service() |
| return {"service_instance_uuid": service_instance_uuid}, 201 |
| return "Service not found", 404 |
| |
| def get(self): |
| """ |
| Returns a list of UUIDs containing all running services. |
| :return: dict / list |
| """ |
| LOG.info("GET /instantiations") |
| return {"service_instantiations_list": [ |
| list(s.instances.iterkeys()) for s in GK.services.itervalues()]} |
| |
| def delete(self): |
| """ |
| Stops a running service specified by its service and instance UUID. |
| """ |
| # try to extract the service and instance UUID from the request |
| json_data = request.get_json(force=True) |
| service_uuid = json_data.get("service_uuid") |
| instance_uuid = json_data.get("service_instance_uuid") |
| |
| # try to be fuzzy |
| if service_uuid is None and len(GK.services) > 0: |
| #if we don't get a service uuid, we simply stop the last service in the list |
| service_uuid = list(GK.services.iterkeys())[0] |
| if instance_uuid is None and len(GK.services[service_uuid].instances) > 0: |
| instance_uuid = list(GK.services[service_uuid].instances.iterkeys())[0] |
| |
| if service_uuid in GK.services and instance_uuid in GK.services[service_uuid].instances: |
| # valid service and instance UUID, stop service |
| GK.services.get(service_uuid).stop_service(instance_uuid) |
| return "service instance with uuid %r stopped." % instance_uuid,200 |
| return "Service not found", 404 |
| |
| class Exit(fr.Resource): |
| |
| def put(self): |
| """ |
| Stop the running Containernet instance regardless of data transmitted |
| """ |
| list(GK.dcs.values())[0].net.stop() |
| |
| |
| def initialize_GK(): |
| global GK |
| GK = Gatekeeper() |
| |
| |
| |
| # create a single, global GK object |
| GK = None |
| initialize_GK() |
| # setup Flask |
| app = Flask(__name__) |
| app.config['MAX_CONTENT_LENGTH'] = 512 * 1024 * 1024 # 512 MB max upload |
| api = fr.Api(app) |
| # define endpoints |
| api.add_resource(Packages, '/packages', '/api/v2/packages') |
| api.add_resource(Instantiations, '/instantiations', '/api/v2/instantiations', '/api/v2/requests') |
| api.add_resource(Exit, '/emulator/exit') |
| |
| |
| |
| def start_rest_api(host, port, datacenters=dict()): |
| GK.dcs = datacenters |
| GK.net = get_dc_network() |
| # start the Flask server (not the best performance but ok for our use case) |
| app.run(host=host, |
| port=port, |
| debug=True, |
| use_reloader=False # this is needed to run Flask in a non-main thread |
| ) |
| |
| |
| def ensure_dir(name): |
| if not os.path.exists(name): |
| os.makedirs(name) |
| |
| |
| def load_yaml(path): |
| with open(path, "r") as f: |
| try: |
| r = yaml.load(f) |
| except yaml.YAMLError as exc: |
| LOG.exception("YAML parse error") |
| r = dict() |
| return r |
| |
| |
| def make_relative_path(path): |
| if path.startswith("file://"): |
| path = path.replace("file://", "", 1) |
| if path.startswith("/"): |
| path = path.replace("/", "", 1) |
| return path |
| |
| |
| def get_dc_network(): |
| """ |
| retrieve the DCnetwork where this dummygatekeeper (GK) connects to. |
| Assume at least 1 datacenter is connected to this GK, and that all datacenters belong to the same DCNetwork |
| :return: |
| """ |
| assert (len(GK.dcs) > 0) |
| return GK.dcs.values()[0].net |
| |
| |
| def parse_interface(interface_name): |
| """ |
| convert the interface name in the nsd to the according vnf_id, vnf_interface names |
| :param interface_name: |
| :return: |
| """ |
| |
| if ':' in interface_name: |
| vnf_id, vnf_interface = interface_name.split(':') |
| vnf_sap_docker_name = interface_name.replace(':', '_') |
| else: |
| vnf_id = interface_name |
| vnf_interface = interface_name |
| vnf_sap_docker_name = interface_name |
| |
| return vnf_id, vnf_interface, vnf_sap_docker_name |
| |
| if __name__ == '__main__': |
| """ |
| Lets allow to run the API in standalone mode. |
| """ |
| GK_STANDALONE_MODE = True |
| logging.getLogger("werkzeug").setLevel(logging.INFO) |
| start_rest_api("0.0.0.0", 8000) |
| |