import uuid
import hashlib
import zipfile
+import yaml
+from docker import Client as DockerClient
from flask import Flask, request
import flask_restful as fr
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):
# lets perform all steps needed to onboard the service
service.onboard()
+ def get_next_vnf_name(self):
+ self.vnf_counter += 1
+ return "sonvnf%d" % self.vnf_counter
+
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):
"""
# 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)
+ self._calculate_placement(FirstDcPlacement)
+ # iterate over all vnfds that we have to start
+ for vnfd in self.vnfds.itervalues():
+ # iterate over all deployment units within each VNFDs
+ for u in vnfd.get("virtual_deployment_units"):
+ # 3. get the name of the docker image to start and the assigned DC
+ docker_name = u.get("vm_image")
+ target_dc = vnfd.get("dc")
+ # 4. 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)
+ # 5. 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
+ self.instances[instance_uuid]["vnf_instances"].append(vnfi)
+ LOG.info("Service started. Instance id: %r" % instance_uuid)
+ return instance_uuid
def _unpack_service_package(self):
"""
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 MANIFEST.MF and store them in dict.
+ :return:
+ """
+ if "package_content" in self.manifest:
+ for df in self.manifest.get("package_content"):
+ if df.get("content-type") == "application/sonata.docker_files":
+ docker_path = os.path.join(
+ self.package_content_path,
+ make_relative_path(df.get("name")))
+ # FIXME: Mapping to docker image names is hardcoded because of the missing mapping in the example package
+ self.local_docker_files[helper_map_docker_name(df.get("name"))] = 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
+ """
+ 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
pass
+
+ def _check_docker_image_exists(self, image_name):
# TODO implement
+ return True
+
+ 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]
"""
"""
# TODO implement method (start real service)
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)
+ service_uuid = list(GK.services.iterkeys())[0] #json_data.get("service_uuid") # TODO only for quick testing
+ if service_uuid in GK.services:
+ 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):
"""
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,
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("/"):
+ return path.replace("/", "", 1)
+ return path
+
+
+def helper_map_docker_name(name):
+ """
+ Quick hack to fix missing dependency in example package.
+ """
+ # TODO remove this when package description is fixed
+ mapping = {
+ "/docker_files/iperf/Dockerfile": "iperf_docker",
+ "/docker_files/firewall/Dockerfile": "fw_docker",
+ "/docker_files/tcpdump/Dockerfile": "tcpdump_docker"
+ }
+ return mapping.get(name)
if __name__ == '__main__':
projects / osm / vim-emu.git / blobdiff