+"""
+Functions to perform remctls.
+"""
+
+from sipb_xen_database import Machine, Disk, Type, NIC, CDROM, ctx, meta
+import validation
+from webcommon import CodeError, InvalidInput
+import random
+import subprocess
+import sys
+import time
+import re
+
+# ... and stolen from xend/uuid.py
+def randomUUID():
+ """Generate a random UUID."""
+
+ return [ random.randint(0, 255) for _ in range(0, 16) ]
+
+def uuidToString(u):
+ """Turn a numeric UUID to a hyphen-seperated one."""
+ return "-".join(["%02x" * 4, "%02x" * 2, "%02x" * 2, "%02x" * 2,
+ "%02x" * 6]) % tuple(u)
+# end stolen code
+
+def kinit(username = 'tabbott/extra', keytab = '/etc/tabbott.keytab'):
+ """Kinit with a given username and keytab"""
+
+ p = subprocess.Popen(['kinit', "-k", "-t", keytab, username],
+ stderr=subprocess.PIPE)
+ e = p.wait()
+ if e:
+ raise CodeError("Error %s in kinit: %s" % (e, p.stderr.read()))
+
+def checkKinit():
+ """If we lack tickets, kinit."""
+ p = subprocess.Popen(['klist', '-s'])
+ if p.wait():
+ kinit()
+
+def remctl(*args, **kws):
+ """Perform a remctl and return the output.
+
+ kinits if necessary, and outputs errors to stderr.
+ """
+ checkKinit()
+ p = subprocess.Popen(['remctl', 'black-mesa.mit.edu']
+ + list(args),
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE)
+ v = p.wait()
+ if kws.get('err'):
+ return p.stdout.read(), p.stderr.read()
+ if v:
+ print >> sys.stderr, 'Error', v, 'on remctl', args, ':'
+ print >> sys.stderr, p.stderr.read()
+ raise CodeError('ERROR on remctl')
+ return p.stdout.read()
+
+def lvcreate(machine, disk):
+ """Create a single disk for a machine"""
+ remctl('web', 'lvcreate', machine.name,
+ disk.guest_device_name, str(disk.size))
+
+def makeDisks(machine):
+ """Update the lvm partitions to add a disk."""
+ for disk in machine.disks:
+ lvcreate(machine, disk)
+
+def bootMachine(machine, cdtype):
+ """Boot a machine with a given boot CD.
+
+ If cdtype is None, give no boot cd. Otherwise, it is the string
+ id of the CD (e.g. 'gutsy_i386')
+ """
+ if cdtype is not None:
+ remctl('control', machine.name, 'create',
+ cdtype)
+ else:
+ remctl('control', machine.name, 'create')
+
+def registerMachine(machine):
+ """Register a machine to be controlled by the web interface"""
+ remctl('web', 'register', machine.name)
+
+def unregisterMachine(machine):
+ """Unregister a machine to not be controlled by the web interface"""
+ remctl('web', 'unregister', machine.name)
+
+def createVm(user, name, memory, disk, is_hvm, cdrom):
+ """Create a VM and put it in the database"""
+ # put stuff in the table
+ transaction = ctx.current.create_transaction()
+ try:
+ validation.validMemory(user, memory)
+ validation.validDisk(user, disk * 1. / 1024)
+ validation.validAddVm(user)
+ res = meta.engine.execute('select nextval('
+ '\'"machines_machine_id_seq"\')')
+ id = res.fetchone()[0]
+ machine = Machine()
+ machine.machine_id = id
+ machine.name = name
+ machine.memory = memory
+ machine.owner = user.username
+ machine.administrator = user.username
+ machine.contact = user.email
+ machine.uuid = uuidToString(randomUUID())
+ machine.boot_off_cd = True
+ machine_type = Type.get_by(hvm=is_hvm)
+ machine.type_id = machine_type.type_id
+ ctx.current.save(machine)
+ disk = Disk(machine.machine_id,
+ 'hda', disk)
+ open_nics = NIC.select_by(machine_id=None)
+ if not open_nics: #No IPs left!
+ raise CodeError("No IP addresses left! "
+ "Contact sipb-xen-dev@mit.edu")
+ nic = open_nics[0]
+ nic.machine_id = machine.machine_id
+ nic.hostname = name
+ ctx.current.save(nic)
+ ctx.current.save(disk)
+ transaction.commit()
+ except:
+ transaction.rollback()
+ raise
+ registerMachine(machine)
+ makeDisks(machine)
+ # tell it to boot with cdrom
+ bootMachine(machine, cdrom)
+ return machine
+
+def getUptimes(machines=None):
+ """Return a dictionary mapping machine names to uptime strings"""
+ value_string = remctl('web', 'listvms')
+ lines = value_string.splitlines()
+ d = {}
+ for line in lines:
+ lst = line.split()
+ name, id = lst[:2]
+ uptime = ' '.join(lst[2:])
+ d[name] = uptime
+ ans = {}
+ for m in machines:
+ ans[m] = d.get(m.name)
+ return ans
+
+def parseStatus(s):
+ """Parse a status string into nested tuples of strings.
+
+ s = output of xm list --long <machine_name>
+ """
+ values = re.split('([()])', s)
+ stack = [[]]
+ for v in values[2:-2]: #remove initial and final '()'
+ if not v:
+ continue
+ v = v.strip()
+ if v == '(':
+ stack.append([])
+ elif v == ')':
+ if len(stack[-1]) == 1:
+ stack[-1].append('')
+ stack[-2].append(stack[-1])
+ stack.pop()
+ else:
+ if not v:
+ continue
+ stack[-1].extend(v.split())
+ return stack[-1]
+
+def statusInfo(machine):
+ """Return the status list for a given machine.
+
+ Gets and parses xm list --long
+ """
+ value_string, err_string = remctl('control', machine.name, 'list-long',
+ err=True)
+ if 'Unknown command' in err_string:
+ raise CodeError("ERROR in remctl list-long %s is not registered" %
+ (machine.name,))
+ elif 'does not exist' in err_string:
+ return None
+ elif err_string:
+ raise CodeError("ERROR in remctl list-long %s: %s" %
+ (machine.name, err_string))
+ status = parseStatus(value_string)
+ return status
+
+def deleteVM(machine):
+ """Delete a VM."""
+ remctl('control', machine.name, 'destroy', err=True)
+ transaction = ctx.current.create_transaction()
+ delete_disk_pairs = [(machine.name, d.guest_device_name)
+ for d in machine.disks]
+ try:
+ for nic in machine.nics:
+ nic.machine_id = None
+ nic.hostname = None
+ ctx.current.save(nic)
+ for disk in machine.disks:
+ ctx.current.delete(disk)
+ ctx.current.delete(machine)
+ transaction.commit()
+ except:
+ transaction.rollback()
+ raise
+ for mname, dname in delete_disk_pairs:
+ remctl('web', 'lvremove', mname, dname)
+ unregisterMachine(machine)
+
+def commandResult(user, fields):
+ start_time = 0
+ print >> sys.stderr, time.time()-start_time
+ machine = validation.testMachineId(user, fields.getfirst('machine_id'))
+ action = fields.getfirst('action')
+ cdrom = fields.getfirst('cdrom')
+ print >> sys.stderr, time.time()-start_time
+ if cdrom is not None and not CDROM.get(cdrom):
+ raise CodeError("Invalid cdrom type '%s'" % cdrom)
+ if action not in ('Reboot', 'Power on', 'Power off', 'Shutdown',
+ 'Delete VM'):
+ raise CodeError("Invalid action '%s'" % action)
+ if action == 'Reboot':
+ if cdrom is not None:
+ out, err = remctl('control', machine.name, 'reboot', cdrom,
+ err=True)
+ else:
+ out, err = remctl('control', machine.name, 'reboot',
+ err=True)
+ if err:
+ if re.match("Error: Domain '.*' does not exist.", err):
+ raise InvalidInput("action", "reboot",
+ "Machine is not on")
+ else:
+ print >> sys.stderr, 'Error on reboot:'
+ print >> sys.stderr, err
+ raise CodeError('ERROR on remctl')
+
+ elif action == 'Power on':
+ if validation.maxMemory(user, machine) < machine.memory:
+ raise InvalidInput('action', 'Power on',
+ "You don't have enough free RAM quota "
+ "to turn on this machine.")
+ bootMachine(machine, cdrom)
+ elif action == 'Power off':
+ out, err = remctl('control', machine.name, 'destroy', err=True)
+ if err:
+ if re.match("Error: Domain '.*' does not exist.", err):
+ raise InvalidInput("action", "Power off",
+ "Machine is not on.")
+ else:
+ print >> sys.stderr, 'Error on power off:'
+ print >> sys.stderr, err
+ raise CodeError('ERROR on remctl')
+ elif action == 'Shutdown':
+ out, err = remctl('control', machine.name, 'shutdown', err=True)
+ if err:
+ if re.match("Error: Domain '.*' does not exist.", err):
+ raise InvalidInput("action", "Shutdown",
+ "Machine is not on.")
+ else:
+ print >> sys.stderr, 'Error on Shutdown:'
+ print >> sys.stderr, err
+ raise CodeError('ERROR on remctl')
+ elif action == 'Delete VM':
+ deleteVM(machine)
+ print >> sys.stderr, time.time()-start_time
+
+ d = dict(user=user,
+ command=action,
+ machine=machine)
+ return d
+
+def resizeDisk(machine_name, disk_name, new_size):
+ remctl("web", "lvresize", machine_name, disk_name, new_size)
+
+def renameMachine(machine, old_name, new_name):
+ for disk in machine.disks:
+ remctl("web", "lvrename", old_name,
+ disk.guest_device_name, new_name)
+ remctl("web", "moveregister", old_name, new_name)
+
projects / invirt/packages/invirt-web.git / commitdiff
