mirror of
https://github.com/GNS3/gns3-server.git
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341 lines
11 KiB
Python
341 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2014 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Base cloud controller class.
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Base class for interacting with Cloud APIs to create and manage cloud
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instances.
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"""
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from collections import namedtuple
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import hashlib
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import os
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import logging
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from io import StringIO, BytesIO
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from libcloud.compute.base import NodeAuthSSHKey
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from libcloud.storage.types import ContainerAlreadyExistsError, ContainerDoesNotExistError, ObjectDoesNotExistError
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from .exceptions import ItemNotFound, KeyPairExists, MethodNotAllowed
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from .exceptions import OverLimit, BadRequest, ServiceUnavailable
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from .exceptions import Unauthorized, ApiError
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KeyPair = namedtuple("KeyPair", ['name'], verbose=False)
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log = logging.getLogger(__name__)
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def parse_exception(exception):
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"""
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Parse the exception to separate the HTTP status code from the text.
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Libcloud raises many exceptions of the form:
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Exception("<http status code> <http error> <reponse body>")
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in lieu of raising specific incident-based exceptions.
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"""
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e_str = str(exception)
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try:
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status = int(e_str[0:3])
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error_text = e_str[3:]
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except ValueError:
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status = None
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error_text = e_str
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return status, error_text
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class BaseCloudCtrl(object):
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""" Base class for interacting with a cloud provider API. """
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http_status_to_exception = {
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400: BadRequest,
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401: Unauthorized,
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404: ItemNotFound,
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405: MethodNotAllowed,
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413: OverLimit,
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500: ApiError,
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503: ServiceUnavailable
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}
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GNS3_CONTAINER_NAME = 'GNS3'
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def __init__(self, username, api_key):
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self.username = username
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self.api_key = api_key
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def _handle_exception(self, status, error_text, response_overrides=None):
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""" Raise an exception based on the HTTP status. """
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if response_overrides:
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if status in response_overrides:
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raise response_overrides[status](error_text)
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raise self.http_status_to_exception[status](error_text)
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def authenticate(self):
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""" Validate cloud account credentials. Return boolean. """
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raise NotImplementedError
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def list_sizes(self):
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""" Return a list of NodeSize objects. """
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return self.driver.list_sizes()
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def list_flavors(self):
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""" Return an iterable of flavors """
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raise NotImplementedError
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def create_instance(self, name, size_id, image_id, keypair):
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"""
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Create a new instance with the supplied attributes.
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Return a Node object.
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"""
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try:
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image = self.get_image(image_id)
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if image is None:
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raise ItemNotFound("Image not found")
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size = self.driver.ex_get_size(size_id)
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args = {
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"name": name,
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"size": size,
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"image": image,
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}
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if keypair is not None:
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auth_key = NodeAuthSSHKey(keypair.public_key)
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args["auth"] = auth_key
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args["ex_keyname"] = name
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return self.driver.create_node(**args)
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except Exception as e:
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status, error_text = parse_exception(e)
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if status:
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self._handle_exception(status, error_text)
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else:
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log.error("create_instance method raised an exception: {}".format(e))
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log.error('image id {}'.format(image))
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def delete_instance(self, instance):
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""" Delete the specified instance. Returns True or False. """
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try:
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return self.driver.destroy_node(instance)
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except Exception as e:
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status, error_text = parse_exception(e)
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if status:
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self._handle_exception(status, error_text)
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else:
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raise e
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def get_instance(self, instance):
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""" Return a Node object representing the requested instance. """
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for i in self.driver.list_nodes():
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if i.id == instance.id:
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return i
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raise ItemNotFound("Instance not found")
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def list_instances(self):
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""" Return a list of instances in the current region. """
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try:
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return self.driver.list_nodes()
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except Exception as e:
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log.error("list_instances returned an error: {}".format(e))
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def create_key_pair(self, name):
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""" Create and return a new Key Pair. """
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response_overrides = {
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409: KeyPairExists
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}
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try:
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return self.driver.create_key_pair(name)
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except Exception as e:
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status, error_text = parse_exception(e)
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if status:
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self._handle_exception(status, error_text, response_overrides)
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else:
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raise e
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def delete_key_pair(self, keypair):
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""" Delete the keypair. Returns True or False. """
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try:
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return self.driver.delete_key_pair(keypair)
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except Exception as e:
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status, error_text = parse_exception(e)
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if status:
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self._handle_exception(status, error_text)
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else:
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raise e
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def delete_key_pair_by_name(self, keypair_name):
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""" Utility method to incapsulate boilerplate code """
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kp = KeyPair(name=keypair_name)
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return self.delete_key_pair(kp)
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def list_key_pairs(self):
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""" Return a list of Key Pairs. """
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return self.driver.list_key_pairs()
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def upload_file(self, file_path, cloud_object_name):
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"""
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Uploads file to cloud storage (if it is not identical to a file already in cloud storage).
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:param file_path: path to file to upload
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:param cloud_object_name: name of file saved in cloud storage
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:return: True if file was uploaded, False if it was skipped because it already existed and was identical
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"""
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try:
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gns3_container = self.storage_driver.create_container(self.GNS3_CONTAINER_NAME)
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except ContainerAlreadyExistsError:
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gns3_container = self.storage_driver.get_container(self.GNS3_CONTAINER_NAME)
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with open(file_path, 'rb') as file:
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local_file_hash = hashlib.md5(file.read()).hexdigest()
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cloud_hash_name = cloud_object_name + '.md5'
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cloud_objects = [obj.name for obj in gns3_container.list_objects()]
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# if the file and its hash are in object storage, and the local and storage file hashes match
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# do not upload the file, otherwise upload it
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if cloud_object_name in cloud_objects and cloud_hash_name in cloud_objects:
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hash_object = gns3_container.get_object(cloud_hash_name)
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cloud_object_hash = ''
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for chunk in hash_object.as_stream():
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cloud_object_hash += chunk.decode('utf8')
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if cloud_object_hash == local_file_hash:
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return False
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file.seek(0)
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self.storage_driver.upload_object_via_stream(file, gns3_container, cloud_object_name)
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self.storage_driver.upload_object_via_stream(StringIO(local_file_hash), gns3_container, cloud_hash_name)
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return True
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def list_projects(self):
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"""
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Lists projects in cloud storage
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:return: Dictionary where project names are keys and values are names of objects in storage
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"""
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try:
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gns3_container = self.storage_driver.get_container(self.GNS3_CONTAINER_NAME)
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projects = {
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obj.name.replace('projects/', '').replace('.zip', ''): obj.name
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for obj in gns3_container.list_objects()
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if obj.name.startswith('projects/') and obj.name[-4:] == '.zip'
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}
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return projects
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except ContainerDoesNotExistError:
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return []
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def download_file(self, file_name, destination=None):
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"""
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Downloads file from cloud storage. If a file exists at destination, and it is identical to the file in cloud
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storage, it is not downloaded.
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:param file_name: name of file in cloud storage to download
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:param destination: local path to save file to (if None, returns file contents as a file-like object)
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:return: A file-like object if file contents are returned, or None if file is saved to filesystem
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"""
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gns3_container = self.storage_driver.get_container(self.GNS3_CONTAINER_NAME)
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storage_object = gns3_container.get_object(file_name)
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if destination is not None:
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if os.path.isfile(destination):
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# if a file exists at destination and its hash matches that of the
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# file in cloud storage, don't download it
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with open(destination, 'rb') as f:
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local_file_hash = hashlib.md5(f.read()).hexdigest()
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hash_object = gns3_container.get_object(file_name + '.md5')
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cloud_object_hash = ''
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for chunk in hash_object.as_stream():
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cloud_object_hash += chunk.decode('utf8')
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if local_file_hash == cloud_object_hash:
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return
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storage_object.download(destination)
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else:
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contents = b''
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for chunk in storage_object.as_stream():
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contents += chunk
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return BytesIO(contents)
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def find_storage_image_names(self, images_to_find):
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"""
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Maps names of image files to their full name in cloud storage
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:param images_to_find: list of image names to find
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:return: A dictionary where keys are image names, and values are the corresponding names of
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the files in cloud storage
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"""
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gns3_container = self.storage_driver.get_container(self.GNS3_CONTAINER_NAME)
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images_in_storage = [obj.name for obj in gns3_container.list_objects() if obj.name.startswith('images/')]
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images = {}
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for image_name in images_to_find:
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images_with_same_name =\
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list(filter(lambda storage_image_name: storage_image_name.endswith(image_name), images_in_storage))
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if len(images_with_same_name) == 1:
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images[image_name] = images_with_same_name[0]
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else:
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raise Exception('Image does not exist in cloud storage or is duplicated')
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return images
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def delete_file(self, file_name):
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gns3_container = self.storage_driver.get_container(self.GNS3_CONTAINER_NAME)
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try:
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object_to_delete = gns3_container.get_object(file_name)
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object_to_delete.delete()
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except ObjectDoesNotExistError:
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pass
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try:
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hash_object = gns3_container.get_object(file_name + '.md5')
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hash_object.delete()
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except ObjectDoesNotExistError:
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pass
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