Haizea

# -------------------------------------------------------------------------- #

# Copyright 2006-2009, University of Chicago                                 #

# Copyright 2008-2009, Distributed Systems Architecture Group, Universidad   #

# Complutense de Madrid (dsa-research.org)                                   #

#                                                                            #

# 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.                                             #

# -------------------------------------------------------------------------- #

from haizea.common.utils import vnodemapstr

import haizea.common.constants as constants

import haizea.core.enact.actions as actions

from haizea.core.scheduler import EnactmentError

import logging 

class ResourcePool(object):

    def __init__(self, info_enact, vm_enact, deploy_enact):

        self.logger = logging.getLogger("RPOOL")

        self.info = info_enact

        self.vm = vm_enact

        # TODO: Ideally, deployment enactment shouldn't be here, specially since

        # it already "hangs" below the deployment modules. For now,

        # it does no harm, though.

        self.deployment = deploy_enact

        self.nodes = self.info.get_nodes()

    def start_vms(self, lease, rr):

        start_action = actions.VMEnactmentStartAction()

        start_action.from_rr(rr)

        for (vnode, pnode) in rr.nodes.items():

            node = self.get_node(pnode)

            #diskimage = node.get_diskimage(lease.id, vnode, lease.diskimage_id)

            start_action.vnodes[vnode].pnode = node.enactment_info

            #start_action.vnodes[vnode].diskimage = diskimage.filename

            start_action.vnodes[vnode].resources = rr.resources_in_pnode[pnode]

        try:

            self.vm.start(start_action)

        except EnactmentError, exc:

            self.logger.error("Enactment of start VM failed: %s" % exc.message)

            raise

    def stop_vms(self, lease, rr):

        stop_action = actions.VMEnactmentStopAction()

        stop_action.from_rr(rr)

        try:

            self.vm.stop(stop_action)

        except EnactmentError, exc:

            self.logger.error("Enactment of end VM failed: %s" % exc.message)

            raise

    def suspend_vms(self, lease, rr):

        # Add memory image files

        for vnode in rr.vnodes:

            pnode = rr.vmrr.nodes[vnode]

            self.add_ramfile(pnode, lease.id, vnode, lease.requested_resources[vnode].get_quantity(constants.RES_MEM))

        # Enact suspend

        suspend_action = actions.VMEnactmentSuspendAction()

        suspend_action.from_rr(rr)

        try:

            self.vm.suspend(suspend_action)

        except EnactmentError, exc:

            self.logger.error("Enactment of suspend VM failed: %s" % exc.message)

            raise

    def verify_suspend(self, lease, rr):

        verify_suspend_action = actions.VMEnactmentConfirmSuspendAction()

        verify_suspend_action.from_rr(rr)

        self.vm.verify_suspend(verify_suspend_action)

    def resume_vms(self, lease, rr):

        # Remove memory image files

        for vnode in rr.vnodes:

            pnode = rr.vmrr.nodes[vnode]

            self.remove_ramfile(pnode, lease.id, vnode)

        # Enact resume

        resume_action = actions.VMEnactmentResumeAction()

        resume_action.from_rr(rr)

        try:

            self.vm.resume(resume_action)

        except EnactmentError, exc:

            self.logger.error("Enactment of resume VM failed: %s" % exc.message)

            raise

    def verify_resume(self, lease, rr):

        verify_resume_action = actions.VMEnactmentConfirmResumeAction()

        verify_resume_action.from_rr(rr)

        self.vm.verify_resume(verify_resume_action)    

    def refresh_nodes(self):

        new_nodes = self.info.refresh()

        for node in new_nodes:

            self.nodes[node.id] = node

        return new_nodes        

    def get_nodes(self):

        return self.nodes.values()

    # An auxiliary node is a host whose resources are going to be scheduled, but

    # where no VMs are actually going to run. For example, a disk image repository node.

    def get_aux_nodes(self):

        # TODO: We're only asking the deployment enactment module for auxiliary nodes.

        # There might be a scenario where the info enactment module also reports

        # auxiliary nodes.

        return self.deployment.get_aux_nodes()

    def get_num_nodes(self):

        return len(self.nodes)

    def get_node(self, node_id):

        return self.nodes[node_id]

    def add_diskimage(self, pnode, diskimage_id, imagesize, lease_id, vnode):

        self.logger.debug("Adding disk image for L%iV%i in pnode=%i" % (lease_id, vnode, pnode))

        self.logger.vdebug("Files BEFORE:")

        self.get_node(pnode).print_files()

        imagefile = self.deployment.resolve_to_file(lease_id, vnode, diskimage_id)

        img = DiskImageFile(imagefile, imagesize, lease_id, vnode, diskimage_id)

        self.get_node(pnode).add_file(img)

        self.logger.vdebug("Files AFTER:")

        self.get_node(pnode).print_files()

        return img

    def remove_diskimage(self, pnode, lease, vnode):

        node = self.get_node(pnode)

        node.print_files()

        self.logger.debug("Removing disk image for L%iV%i in node %i" % (lease, vnode, pnode))

        node.remove_diskimage(lease, vnode)

        node.print_files()

    def add_ramfile(self, pnode, lease_id, vnode, size):

        node = self.get_node(pnode)

        self.logger.debug("Adding RAM file for L%iV%i in node %i" % (lease_id, vnode, pnode))

        node.print_files()

        f = RAMImageFile("RAM_L%iV%i" % (lease_id, vnode), size, lease_id, vnode)

        node.add_file(f)        

        node.print_files()

    def remove_ramfile(self, pnode, lease_id, vnode):

        node = self.get_node(pnode)

        self.logger.debug("Removing RAM file for L%iV%i in node %i" % (lease_id, vnode, pnode))

        node.print_files()

        node.remove_ramfile(lease_id, vnode)

        node.print_files()

    def get_max_disk_usage(self):

        return max([n.get_disk_usage() for n in self.nodes.values()])

class ResourcePoolNode(object):

    def __init__(self, node_id, hostname, capacity):

        self.logger = logging.getLogger("RESOURCEPOOL")

        self.id = node_id

        self.hostname = hostname

        self.capacity = capacity

        self.files = []

        # enactment-specific information

        self.enactment_info = None

    def get_capacity(self):

        return self.capacity

    def add_file(self, f):

        self.files.append(f)

    def get_diskimage(self, lease_id, vnode, diskimage_id):

        image = [f for f in self.files if isinstance(f, DiskImageFile) and 

                 f.diskimage_id == diskimage_id and 

                 f.lease_id == lease_id and

                 f.vnode == vnode]

        if len(image) == 0:

            return None

        elif len(image) == 1:

            return image[0]

        elif len(image) > 1:

            self.logger.warning("More than one tainted image for L%iV%i on node %i" % (lease_id, vnode, self.id))

            return image[0]

    def remove_diskimage(self, lease_id, vnode):

        image = [f for f in self.files if isinstance(f, DiskImageFile) and 

                 f.lease_id == lease_id and

                 f.vnode == vnode]

        if len(image) > 0:

            image = image[0]

            self.files.remove(image)

    def remove_ramfile(self, lease_id, vnode):

        ramfile = [f for f in self.files if isinstance(f, RAMImageFile) and f.lease_id==lease_id and f.vnode==vnode]

        if len(ramfile) > 0:

            ramfile = ramfile[0]

            self.files.remove(ramfile)

    def get_disk_usage(self):

        return sum([f.filesize for f in self.files])

    def get_diskimages(self):

        return [f for f in self.files if isinstance(f, DiskImageFile)]

    def print_files(self):

        images = ""

        if len(self.files) > 0:

            images = ", ".join([str(img) for img in self.files])

        self.logger.vdebug("Node %i files: %iMB %s" % (self.id, self.get_disk_usage(), images))

    def xmlrpc_marshall(self):

        # Convert to something we can send through XMLRPC

        h = {}

        h["id"] = self.id

        h["hostname"] = self.hostname

        h["cpu"] = self.capacity.get_quantity(constants.RES_CPU)

        h["mem"] = self.capacity.get_quantity(constants.RES_MEM)

        return h

class File(object):

    def __init__(self, filename, filesize):

        self.filename = filename

        self.filesize = filesize

class DiskImageFile(File):

    def __init__(self, filename, filesize, lease_id, vnode, diskimage_id):

        File.__init__(self, filename, filesize)

        self.lease_id = lease_id

        self.vnode = vnode

        self.diskimage_id = diskimage_id

    def __str__(self):

        return "(DISK L%iv%i %s %s)" % (self.lease_id, self.vnode, self.diskimage_id, self.filename)

class RAMImageFile(File):

    def __init__(self, filename, filesize, lease_id, vnode):

        File.__init__(self, filename, filesize)

        self.lease_id = lease_id

        self.vnode = vnode

    def __str__(self):

        return "(RAM L%iv%i %s)" % (self.lease_id, self.vnode, self.filename)

class ResourcePoolWithReusableImages(ResourcePool):

    def __init__(self, info_enact, vm_enact, deploy_enact):

        ResourcePool.__init__(self, info_enact, vm_enact, deploy_enact)

        self.nodes = dict([(id,ResourcePoolNodeWithReusableImages.from_node(node)) for id, node in self.nodes.items()])

    def add_reusable_image(self, pnode, diskimage_id, imagesize, mappings, timeout):

        self.logger.debug("Adding reusable image for %s in pnode=%i" % (mappings, pnode))

        self.logger.vdebug("Files BEFORE:")

        self.get_node(pnode).print_files()

        imagefile = "reusable-%s" % diskimage_id

        img = ReusableDiskImageFile(imagefile, imagesize, diskimage_id, timeout)

        for (lease_id, vnode) in mappings:

            img.add_mapping(lease_id, vnode)

        self.get_node(pnode).add_reusable_image(img)

        self.logger.vdebug("Files AFTER:")

        self.get_node(pnode).print_files()

        return img

    def add_mapping_to_existing_reusable_image(self, pnode_id, diskimage_id, lease_id, vnode, timeout):

        self.get_node(pnode_id).add_mapping_to_existing_reusable_image(diskimage_id, lease_id, vnode, timeout)

    def remove_diskimage(self, pnode_id, lease, vnode):

        ResourcePool.remove_diskimage(self, pnode_id, lease, vnode)

        self.logger.debug("Removing cached images for L%iV%i in node %i" % (lease, vnode, pnode_id))

        for img in self.get_node(pnode_id).get_reusable_images():

            if (lease, vnode) in img.mappings:

                img.mappings.remove((lease, vnode))

            self.get_node(pnode_id).print_files()

            # Keep image around, even if it isn't going to be used

            # by any VMs. It might be reused later on.

            # It will be purged if space has to be made available

            # for other images

    def get_nodes_with_reusable_image(self, diskimage_id, after = None):

        return [n.id for n in self.get_nodes() if n.exists_reusable_image(diskimage_id, after=after)]

    def exists_reusable_image(self, pnode_id, diskimage_id, after):

        return self.get_node(pnode_id).exists_reusable_image(diskimage_id, after = after)

class ResourcePoolNodeWithReusableImages(ResourcePoolNode):

    def __init__(self, node_id, hostname, capacity):

        ResourcePoolNode.__init__(self, node_id, hostname, capacity)

        self.reusable_images = []

    @classmethod

    def from_node(cls, n):

        node = cls(n.id, n.hostname, n.capacity)

        node.enactment_info = n.enactment_info

        return node

    def add_reusable_image(self, f):

        self.reusable_images.append(f)

    def add_mapping_to_existing_reusable_image(self, diskimage_id, lease_id, vnode, timeout):

        for f in self.reusable_images:

            if f.diskimage_id == diskimage_id:

                f.add_mapping(lease_id, vnode)

                f.update_timeout(timeout)

                break  # Ugh

        self.print_files()

    def get_reusable_image(self, diskimage_id, after = None, lease_id=None, vnode=None):

        images = [i for i in self.reusable_images if i.diskimage_id == diskimage_id]

        if after != None:

            images = [i for i in images if i.timeout >= after]

        if lease_id != None and vnode != None:

            images = [i for i in images if i.has_mapping(lease_id, vnode)]

        if len(images)>0:

            return images[0]

        else:

            return None

    def exists_reusable_image(self, imagefile, after = None, lease_id=None, vnode=None):

        entry = self.get_reusable_image(imagefile, after = after, lease_id=lease_id, vnode=vnode)

        if entry == None:

            return False

        else:

            return True

    def get_reusable_images(self):

        return self.reusable_images

    def get_reusable_images_size(self):

        return sum([f.filesize for f in self.reusable_images])

    def purge_oldest_unused_image(self):

        unused = [img for img in self.reusable_images if not img.has_mappings()]

        if len(unused) == 0:

            return 0

        else:

            i = iter(unused)

            oldest = i.next()

            for img in i:

                if img.timeout < oldest.timeout:

                    oldest = img

            self.reusable_images.remove(oldest)

            return 1

    def purge_downto(self, target):

        done = False

        while not done:

            removed = self.purge_oldest_unused_image()

            if removed==0:

                done = True

                success = False

            elif removed == 1:

                if self.get_reusable_images_size() <= target:

                    done = True

                    success = True

        return success

    def print_files(self):

        ResourcePoolNode.print_files(self)

        images = ""

        if len(self.reusable_images) > 0:

            images = ", ".join([str(img) for img in self.reusable_images])

        self.logger.vdebug("Node %i reusable images: %iMB %s" % (self.id, self.get_reusable_images_size(), images))

class ReusableDiskImageFile(File):

    def __init__(self, filename, filesize, diskimage_id, timeout):

        File.__init__(self, filename, filesize)

        self.diskimage_id = diskimage_id

        self.mappings = set([])

        self.timeout = timeout

    def add_mapping(self, lease_id, vnode):

        self.mappings.add((lease_id, vnode))

    def has_mapping(self, lease_id, vnode):

        return (lease_id, vnode) in self.mappings

    def has_mappings(self):

        return len(self.mappings) > 0

    def update_timeout(self, timeout):

        if timeout > self.timeout:

            self.timeout = timeout

    def is_expired(self, curTime):

        if self.timeout == None:

            return False

        elif self.timeout > curTime:

            return True

        else:

            return False

    def __str__(self):

        if self.timeout == None:

            timeout = "NOTIMEOUT"

        else:

            timeout = self.timeout

        return "(REUSABLE %s %s %s %s)" % (vnodemapstr(self.mappings), self.diskimage_id, str(timeout), self.filename)