X-Git-Url: https://osm.etsi.org/gitweb/?a=blobdiff_plain;f=src%2Femuvim%2Fapi%2Fsonata%2Fdummygatekeeper.py;h=c69fd9a2333ebd204e05316e2f57153446a73cd9;hb=b8d9ecb3e6fc0c477794259b96f76a2ed7049cd5;hp=71fd94c6b30abb2c464685698083bfe80edfc3cd;hpb=786cd5487fb74d3e91bdf8b316c2e64e2fc9c575;p=osm%2Fvim-emu.git diff --git a/src/emuvim/api/sonata/dummygatekeeper.py b/src/emuvim/api/sonata/dummygatekeeper.py index 71fd94c..c69fd9a 100644 --- a/src/emuvim/api/sonata/dummygatekeeper.py +++ b/src/emuvim/api/sonata/dummygatekeeper.py @@ -10,22 +10,30 @@ import os import uuid import hashlib import zipfile +import yaml +from docker import Client as DockerClient from flask import Flask, request import flask_restful as fr +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/") -UPLOAD_FOLDER = "/tmp/son-dummy-gk/uploads/" -CATALOG_FOLDER = "/tmp/son-dummy-gk/catalog/" +# flag to indicate that we run without the emulator (only the bare API for integration testing) +GK_STANDALONE_MODE = False class Gatekeeper(object): def __init__(self): self.services = dict() + self.dcs = dict() + 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): @@ -38,6 +46,10 @@ class Gatekeeper(object): # 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): """ @@ -54,15 +66,11 @@ class Service(object): 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.local_docker_files = dict() self.instances = dict() - LOG.info("Created service: %r" % self.uuid) - - def start_service(self, service_uuid): - # TODO implement method - # 1. parse descriptors - # 2. do the corresponding dc.startCompute(name="foobar") calls - # 3. store references to the compute objects in self.instantiations - pass def onboard(self): """ @@ -72,7 +80,63 @@ class Service(object): # 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() + self._load_docker_files() # 3. prepare container images (e.g. download or build Dockerfile) + self._build_images_from_dockerfiles() + self._download_predefined_dockerimages() + + LOG.info("On-boarded service: %r" % self.manifest.get("package_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) + # iterate over all vnfds that we have to start + 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) + LOG.info("Service started. Instance id: %r" % instance_uuid) + return 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 + docker_name = vnfd.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. do the dc.startCompute(name="foobar") call to run the container + # TODO consider flavors, and other annotations + vnfi = target_dc.startCompute(GK.get_next_vnf_name(), image=docker_name, flavor_name="small") + # 6. store references to the compute objects in self.instances + return vnfi def _unpack_service_package(self): """ @@ -81,9 +145,114 @@ class Service(object): with zipfile.ZipFile(self.package_file_path, "r") as z: z.extractall(self.package_content_path) - def _build_images_from_dockerfile(self): + 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) + LOG.debug("Loaded NSD: %r" % self.nsd.get("ns_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("vnf_name")] = vnfd + LOG.debug("Loaded VNFD: %r" % vnfd.get("vnf_name")) + + 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" % docker_path) + + 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 _download_predefined_dockerimages(self): + """ + If the package contains URLs to pre-build Docker images, we download them with this method. + """ + # TODO implement this if we want to be able to download docker images instead of building them pass - # TODO implement + + 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(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, 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")))) + + +""" +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, dcs): + for name, vnfd in vnfds.iteritems(): + vnfd["dc"] = list(dcs.itervalues())[0] """ @@ -102,6 +271,7 @@ class Packages(fr.Resource): """ try: # get file contents + print(request.files) son_file = request.files['file'] # generate a uuid to reference this package service_uuid = str(uuid.uuid4()) @@ -137,22 +307,28 @@ class Instantiations(fr.Resource): Will return a new UUID to identify the running service instance. :return: UUID """ - # TODO implement method (start real service) + # try to extract the service uuid from the request json_data = request.get_json(force=True) service_uuid = json_data.get("service_uuid") - if service_uuid is not None: - service_instance_uuid = str(uuid.uuid4()) - LOG.info("Starting service %r" % service_uuid) + + # lets be a bit fuzzy here to make testing easier + if service_uuid is None 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} - return None + return "Service not found", 404 def get(self): """ Returns a list of UUIDs containing all running services. :return: dict / list """ - # TODO implement method - return {"service_instance_uuid_list": list()} + return {"service_instance_list": [ + list(s.instances.iterkeys()) for s in GK.services.itervalues()]} # create a single, global GK object @@ -166,7 +342,8 @@ api.add_resource(Packages, '/api/packages') api.add_resource(Instantiations, '/api/instantiations') -def start_rest_api(host, port): +def start_rest_api(host, port, datacenters=dict()): + GK.dcs = datacenters # start the Flask server (not the best performance but ok for our use case) app.run(host=host, port=port, @@ -177,13 +354,32 @@ def start_rest_api(host, port): def ensure_dir(name): if not os.path.exists(name): - os.makedirs(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 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)