Synnefo » snf-ganeti

#

#

# Copyright (C) 2010 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Ganeti RAPI client."""

import httplib

import httplib2

import simplejson

import socket

import urllib

from OpenSSL import SSL

from OpenSSL import crypto

HTTP_DELETE = "DELETE"

HTTP_GET = "GET"

HTTP_PUT = "PUT"

HTTP_POST = "POST"

REPLACE_DISK_PRI = "replace_on_primary"

REPLACE_DISK_SECONDARY = "replace_on_secondary"

REPLACE_DISK_CHG = "replace_new_secondary"

REPLACE_DISK_AUTO = "replace_auto"

VALID_REPLACEMENT_MODES = frozenset([

    REPLACE_DISK_PRI, REPLACE_DISK_SECONDARY, REPLACE_DISK_CHG,

    REPLACE_DISK_AUTO

    ])

VALID_NODE_ROLES = frozenset([

    "drained", "master", "master-candidate", "offline", "regular"

    ])

VALID_STORAGE_TYPES = frozenset(["file", "lvm-pv", "lvm-vg"])

class Error(Exception):

  """Base error class for this module.

  """

  pass

class CertificateError(Error):

  """Raised when a problem is found with the SSL certificate.

  """

  pass

class GanetiApiError(Error):

  """Generic error raised from Ganeti API.

  """

  pass

class InvalidReplacementMode(Error):

  """Raised when an invalid disk replacement mode is attempted.

  """

  pass

class InvalidStorageType(Error):

  """Raised when an invalid storage type is used.

  """

  pass

class InvalidNodeRole(Error):

  """Raised when an invalid node role is used.

  """

  pass

class GanetiRapiClient(object):

  """Ganeti RAPI client.

  """

  USER_AGENT = "Ganeti RAPI Client"

  def __init__(self, master_hostname, port=5080, username=None, password=None,

               ssl_cert_file=None):

    """Constructor.

    @type master_hostname: str

    @param master_hostname: the ganeti cluster master to interact with

    @type port: int

    @param port: the port on which the RAPI is running. (default is 5080)

    @type username: str

    @param username: the username to connect with

    @type password: str

    @param password: the password to connect with

    @type ssl_cert_file: str or None

    @param ssl_cert_file: path to the expected SSL certificate. if None, SSL

        certificate will not be verified

    """

    self._master_hostname = master_hostname

    self._port = port

    self._version = None

    self._http = httplib2.Http()

    # Older versions of httplib2 don't support the connection_type argument

    # to request(), so we have to manually specify the connection object in the

    # internal dict.

    base_url = self._MakeUrl("/", prepend_version=False)

    scheme, authority, _, _, _ = httplib2.parse_uri(base_url)

    conn_key = "%s:%s" % (scheme, authority)

    self._http.connections[conn_key] = \

      HTTPSConnectionOpenSSL(master_hostname, port, cert_file=ssl_cert_file)

    self._headers = {

        "Accept": "text/plain",

        "Content-type": "application/x-www-form-urlencoded",

        "User-Agent": self.USER_AGENT}

    if username is not None and password is not None:

      self._http.add_credentials(username, password)

  def _MakeUrl(self, path, query=None, prepend_version=True):

    """Constructs the URL to pass to the HTTP client.

    @type path: str

    @param path: HTTP URL path

    @type query: list of two-tuples

    @param query: query arguments to pass to urllib.urlencode

    @type prepend_version: bool

    @param prepend_version: whether to automatically fetch and prepend the

        Ganeti RAPI version to the URL path

    @rtype:  str

    @return: URL path

    """

    if prepend_version:

      path = "/%d%s" % (self.GetVersion(), path)

    return "https://%(host)s:%(port)d%(path)s?%(query)s" % {

        "host": self._master_hostname,

        "port": self._port,

        "path": path,

        "query": urllib.urlencode(query or [])}

  def _SendRequest(self, method, path, query=None, content=None,

                   prepend_version=True):

    """Sends an HTTP request.

    This constructs a full URL, encodes and decodes HTTP bodies, and

    handles invalid responses in a pythonic way.

    @type method: str

    @param method: HTTP method to use

    @type path: str

    @param path: HTTP URL path

    @type query: list of two-tuples

    @param query: query arguments to pass to urllib.urlencode

    @type content: str or None

    @param content: HTTP body content

    @type prepend_version: bool

    @param prepend_version: whether to automatically fetch and prepend the

        Ganeti RAPI version to the URL path

    @rtype: str

    @return: JSON-Decoded response

    @raises CertificateError: If an invalid SSL certificate is found

    @raises GanetiApiError: If an invalid response is returned

    """

    if content:

      content = simplejson.JSONEncoder(sort_keys=True).encode(content)

    url = self._MakeUrl(path, query, prepend_version)

    try:

      resp_headers, resp_content = self._http.request(url, method,

          body=content, headers=self._headers)

    except (crypto.Error, SSL.Error):

      raise CertificateError("Invalid SSL certificate.")

    if resp_content:

      resp_content = simplejson.loads(resp_content)

    # TODO: Are there other status codes that are valid? (redirect?)

    if resp_headers.status != 200:

      if isinstance(resp_content, dict):

        msg = ("%s %s: %s" %

            (resp_content["code"], resp_content["message"],

             resp_content["explain"]))

      else:

        msg = resp_content

      raise GanetiApiError(msg)

    return resp_content

  def GetVersion(self):

    """Gets the Remote API version running on the cluster.

    @rtype: int

    @return: Ganeti Remote API version

    """

    if self._version is None:

      self._version = self._SendRequest(HTTP_GET, "/version",

                                        prepend_version=False)

    return self._version

  def GetOperatingSystems(self):

    """Gets the Operating Systems running in the Ganeti cluster.

    @rtype: list of str

    @return: operating systems

    """

    return self._SendRequest(HTTP_GET, "/os")

  def GetInfo(self):

    """Gets info about the cluster.

    @rtype: dict

    @return: information about the cluster

    """

    return self._SendRequest(HTTP_GET, "/info")

  def GetClusterTags(self):

    """Gets the cluster tags.

    @rtype: list of str

    @return: cluster tags

    """

    return self._SendRequest(HTTP_GET, "/tags")

  def AddClusterTags(self, tags, dry_run=False):

    """Adds tags to the cluster.

    @type tags: list of str

    @param tags: tags to add to the cluster

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    """

    query = [("tag", t) for t in tags]

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_PUT, "/tags", query)

  def DeleteClusterTags(self, tags, dry_run=False):

    """Deletes tags from the cluster.

    @type tags: list of str

    @param tags: tags to delete

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    """

    query = [("tag", t) for t in tags]

    if dry_run:

      query.append(("dry-run", 1))

    self._SendRequest(HTTP_DELETE, "/tags", query)

  def GetInstances(self, bulk=False):

    """Gets information about instances on the cluster.

    @type bulk: bool

    @param bulk: whether to return all information about all instances

    @rtype: list of dict or list of str

    @return: if bulk is True, info about the instances, else a list of instances

    """

    query = []

    if bulk:

      query.append(("bulk", 1))

    instances = self._SendRequest(HTTP_GET, "/instances", query)

    if bulk:

      return instances

    else:

      return [i["id"] for i in instances]

  def GetInstanceInfo(self, instance):

    """Gets information about an instance.

    @type instance: str

    @param instance: instance whose info to return

    @rtype: dict

    @return: info about the instance

    """

    return self._SendRequest(HTTP_GET, "/instances/%s" % instance)

  def CreateInstance(self, dry_run=False):

    """Creates a new instance.

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    """

    # TODO: Pass arguments needed to actually create an instance.

    query = []

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_POST, "/instances", query)

  def DeleteInstance(self, instance, dry_run=False):

    """Deletes an instance.

    @type instance: str

    @param instance: the instance to delete

    @rtype: int

    @return: job id

    """

    query = []

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_DELETE, "/instances/%s" % instance, query)

  def GetInstanceTags(self, instance):

    """Gets tags for an instance.

    @type instance: str

    @param instance: instance whose tags to return

    @rtype: list of str

    @return: tags for the instance

    """

    return self._SendRequest(HTTP_GET, "/instances/%s/tags" % instance)

  def AddInstanceTags(self, instance, tags, dry_run=False):

    """Adds tags to an instance.

    @type instance: str

    @param instance: instance to add tags to

    @type tags: list of str

    @param tags: tags to add to the instance

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    """

    query = [("tag", t) for t in tags]

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_PUT, "/instances/%s/tags" % instance, query)

  def DeleteInstanceTags(self, instance, tags, dry_run=False):

    """Deletes tags from an instance.

    @type instance: str

    @param instance: instance to delete tags from

    @type tags: list of str

    @param tags: tags to delete

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    """

    query = [("tag", t) for t in tags]

    if dry_run:

      query.append(("dry-run", 1))

    self._SendRequest(HTTP_DELETE, "/instances/%s/tags" % instance, query)

  def RebootInstance(self, instance, reboot_type=None, ignore_secondaries=None,

                     dry_run=False):

    """Reboots an instance.

    @type instance: str

    @param instance: instance to rebot

    @type reboot_type: str

    @param reboot_type: one of: hard, soft, full

    @type ignore_secondaries: bool

    @param ignore_secondaries: if True, ignores errors for the secondary node

        while re-assembling disks (in hard-reboot mode only)

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    """

    query = []

    if reboot_type:

      query.append(("type", reboot_type))

    if ignore_secondaries is not None:

      query.append(("ignore_secondaries", ignore_secondaries))

    if dry_run:

      query.append(("dry-run", 1))

    self._SendRequest(HTTP_POST, "/instances/%s/reboot" % instance, query)

  def ShutdownInstance(self, instance, dry_run=False):

    """Shuts down an instance.

    @type instance: str

    @param instance: the instance to shut down

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    """

    query = []

    if dry_run:

      query.append(("dry-run", 1))

    self._SendRequest(HTTP_PUT, "/instances/%s/shutdown" % instance, query)

  def StartupInstance(self, instance, dry_run=False):

    """Starts up an instance.

    @type instance: str

    @param instance: the instance to start up

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    """

    query = []

    if dry_run:

      query.append(("dry-run", 1))

    self._SendRequest(HTTP_PUT, "/instances/%s/startup" % instance, query)

  def ReinstallInstance(self, instance, os, no_startup=False):

    """Reinstalls an instance.

    @type instance: str

    @param instance: the instance to reinstall

    @type os: str

    @param os: the os to reinstall

    @type no_startup: bool

    @param no_startup: whether to start the instance automatically

    """

    query = [("os", os)]

    if no_startup:

      query.append(("nostartup", 1))

    self._SendRequest(HTTP_POST, "/instances/%s/reinstall" % instance, query)

  def ReplaceInstanceDisks(self, instance, disks, mode="replace_auto",

                           remote_node=None, iallocator="hail", dry_run=False):

    """Replaces disks on an instance.

    @type instance: str

    @param instance: instance whose disks to replace

    @type disks: list of str

    @param disks: disks to replace

    @type mode: str

    @param mode: replacement mode to use. defaults to replace_auto

    @type remote_node: str or None

    @param remote_node: new secondary node to use (for use with

        replace_new_secondary mdoe)

    @type iallocator: str or None

    @param iallocator: instance allocator plugin to use (for use with

        replace_auto mdoe).  default is hail

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    @raises InvalidReplacementMode: If an invalid disk replacement mode is given

    @raises GanetiApiError: If no secondary node is given with a non-auto

        replacement mode is requested.

    """

    if mode not in VALID_REPLACEMENT_MODES:

      raise InvalidReplacementMode("%s is not a valid disk replacement mode.",

                                   mode)

    query = [("mode", mode), ("disks", ",".join(disks))]

    if mode is REPLACE_DISK_AUTO:

      query.append(("iallocator", iallocator))

    elif mode is REPLACE_DISK_SECONDARY:

      if remote_node is None:

        raise GanetiApiError("You must supply a new secondary node.")

      query.append(("remote_node", remote_node))

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_POST,

                             "/instances/%s/replace-disks" % instance, query)

  def GetJobs(self):

    """Gets all jobs for the cluster.

    @rtype: list of int

    @return: job ids for the cluster

    """

    return [int(j["id"]) for j in self._SendRequest(HTTP_GET, "/jobs")]

  def GetJobStatus(self, job_id):

    """Gets the status of a job.

    @type job_id: int

    @param job_id: job id whose status to query

    @rtype: dict

    @return: job status

    """

    return self._SendRequest(HTTP_GET, "/jobs/%d" % job_id)

  def DeleteJob(self, job_id, dry_run=False):

    """Deletes a job.

    @type job_id: int

    @param job_id: id of the job to delete

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    """

    query = []

    if dry_run:

      query.append(("dry-run", 1))

    self._SendRequest(HTTP_DELETE, "/jobs/%d" % job_id, query)

  def GetNodes(self, bulk=False):

    """Gets all nodes in the cluster.

    @type bulk: bool

    @param bulk: whether to return all information about all instances

    @rtype: list of dict or str

    @return: if bulk is true, info about nodes in the cluster,

        else list of nodes in the cluster

    """

    query = []

    if bulk:

      query.append(("bulk", 1))

    nodes = self._SendRequest(HTTP_GET, "/nodes", query)

    if bulk:

      return nodes

    else:

      return [n["id"] for n in nodes]

  def GetNodeInfo(self, node):

    """Gets information about a node.

    @type node: str

    @param node: node whose info to return

    @rtype: dict

    @return: info about the node

    """

    return self._SendRequest(HTTP_GET, "/nodes/%s" % node)

  def EvacuateNode(self, node, iallocator=None, remote_node=None,

                   dry_run=False):

    """Evacuates instances from a Ganeti node.

    @type node: str

    @param node: node to evacuate

    @type iallocator: str or None

    @param iallocator: instance allocator to use

    @type remote_node: str

    @param remote_node: node to evaucate to

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    @raises GanetiApiError: if an iallocator and remote_node are both specified

    """

    query = []

    if iallocator and remote_node:

      raise GanetiApiError("Only one of iallocator or remote_node can be used.")

    if iallocator:

      query.append(("iallocator", iallocator))

    if remote_node:

      query.append(("remote_node", remote_node))

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_POST, "/nodes/%s/evacuate" % node, query)

  def MigrateNode(self, node, live=True, dry_run=False):

    """Migrates all primary instances from a node.

    @type node: str

    @param node: node to migrate

    @type live: bool

    @param live: whether to use live migration

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    """

    query = []

    if live:

      query.append(("live", 1))

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_POST, "/nodes/%s/migrate" % node, query)

  def GetNodeRole(self, node):

    """Gets the current role for a node.

    @type node: str

    @param node: node whose role to return

    @rtype: str

    @return: the current role for a node

    """

    return self._SendRequest(HTTP_GET, "/nodes/%s/role" % node)

  def SetNodeRole(self, node, role, force=False):

    """Sets the role for a node.

    @type node: str

    @param node: the node whose role to set

    @type role: str

    @param role: the role to set for the node

    @type force: bool

    @param force: whether to force the role change

    @rtype: int

    @return: job id

    @raise InvalidNodeRole: If an invalid node role is specified

    """

    if role not in VALID_NODE_ROLES:

      raise InvalidNodeRole("%s is not a valid node role.", role)

    query = [("force", force)]

    return self._SendRequest(HTTP_PUT, "/nodes/%s/role" % node, query,

                             content=role)

  def GetNodeStorageUnits(self, node, storage_type, output_fields):

    """Gets the storage units for a node.

    @type node: str

    @param node: the node whose storage units to return

    @type storage_type: str

    @param storage_type: storage type whose units to return

    @type output_fields: str

    @param output_fields: storage type fields to return

    @rtype: int

    @return: job id where results can be retrieved

    @raise InvalidStorageType: If an invalid storage type is specified

    """

    # TODO: Add default for storage_type & output_fields

    if storage_type not in VALID_STORAGE_TYPES:

      raise InvalidStorageType("%s is an invalid storage type.", storage_type)

    query = [("storage_type", storage_type), ("output_fields", output_fields)]

    return self._SendRequest(HTTP_GET, "/nodes/%s/storage" % node, query)

  def ModifyNodeStorageUnits(self, node, storage_type, name, allocatable=True):

    """Modifies parameters of storage units on the node.

    @type node: str

    @param node: node whose storage units to modify

    @type storage_type: str

    @param storage_type: storage type whose units to modify

    @type name: str

    @param name: name of the storage unit

    @type allocatable: bool

    @param allocatable: TODO: Document me

    @rtype: int

    @return: job id

    @raise InvalidStorageType: If an invalid storage type is specified

    """

    if storage_type not in VALID_STORAGE_TYPES:

      raise InvalidStorageType("%s is an invalid storage type.", storage_type)

    query = [

        ("storage_type", storage_type), ("name", name),

        ("allocatable", allocatable)

        ]

    return self._SendRequest(HTTP_PUT, "/nodes/%s/storage/modify" % node, query)

  def RepairNodeStorageUnits(self, node, storage_type, name):

    """Repairs a storage unit on the node.

    @type node: str

    @param node: node whose storage units to repair

    @type storage_type: str

    @param storage_type: storage type to repair

    @type name: str

    @param name: name of the storage unit to repair

    @rtype: int

    @return: job id

    @raise InvalidStorageType: If an invalid storage type is specified

    """

    if storage_type not in VALID_STORAGE_TYPES:

      raise InvalidStorageType("%s is an invalid storage type.", storage_type)

    query = [("storage_type", storage_type), ("name", name)]

    return self._SendRequest(HTTP_PUT, "/nodes/%s/storage/repair" % node, query)

  def GetNodeTags(self, node):

    """Gets the tags for a node.

    @type node: str

    @param node: node whose tags to return

    @rtype: list of str

    @return: tags for the node

    """

    return self._SendRequest(HTTP_GET, "/nodes/%s/tags" % node)

  def AddNodeTags(self, node, tags, dry_run=False):

    """Adds tags to a node.

    @type node: str

    @param node: node to add tags to

    @type tags: list of str

    @param tags: tags to add to the node

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    """

    query = [("tag", t) for t in tags]

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_PUT, "/nodes/%s/tags" % node, query,

                             content=tags)

  def DeleteNodeTags(self, node, tags, dry_run=False):

    """Delete tags from a node.

    @type node: str

    @param node: node to remove tags from

    @type tags: list of str

    @param tags: tags to remove from the node

    @type dry_run: bool

    @param dry_run: whether to perform a dry run

    @rtype: int

    @return: job id

    """

    query = [("tag", t) for t in tags]

    if dry_run:

      query.append(("dry-run", 1))

    return self._SendRequest(HTTP_DELETE, "/nodes/%s/tags" % node, query)

class HTTPSConnectionOpenSSL(httplib.HTTPSConnection):

  """HTTPS Connection handler that verifies the SSL certificate.

  """

  # pylint: disable-msg=W0142

  def __init__(self, *args, **kwargs):

    """Constructor.

    """

    httplib.HTTPSConnection.__init__(self, *args, **kwargs)

    self._ssl_cert = None

    if self.cert_file:

      f = open(self.cert_file, "r")

      self._ssl_cert = crypto.load_certificate(crypto.FILETYPE_PEM, f.read())

      f.close()

  # pylint: disable-msg=W0613

  def _VerifySSLCertCallback(self, conn, cert, errnum, errdepth, ok):

    """Verifies the SSL certificate provided by the peer.

    """

    return (self._ssl_cert.digest("sha1") == cert.digest("sha1") and

            self._ssl_cert.digest("md5") == cert.digest("md5"))

  def connect(self):

    """Connect to the server specified when the object was created.

    This ensures that SSL certificates are verified.

    """

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    ctx = SSL.Context(SSL.SSLv23_METHOD)

    ctx.set_options(SSL.OP_NO_SSLv2)

    ctx.use_certificate(self._ssl_cert)

    ctx.set_verify(SSL.VERIFY_PEER | SSL.VERIFY_FAIL_IF_NO_PEER_CERT,

                   self._VerifySSLCertCallback)

    ssl = SSL.Connection(ctx, sock)

    ssl.connect((self.host, self.port))

    self.sock = httplib.FakeSocket(sock, ssl)