X-Git-Url: http://xvm.mit.edu/gitweb/invirt/packages/invirt-web.git/blobdiff_plain/49466ab6194ad35f3857e950721252621c3e539d..bc2c23e470e232b2a87cad3c826fcf4c07dc9d62:/templates/main.py

diff --git a/templates/main.py b/templates/main.py
index 4a50e43..984f3b8 100755
--- a/templates/main.py
+++ b/templates/main.py
@@ -13,7 +13,6 @@ import sha
 import hmac
 import datetime
 
-print 'Content-Type: text/html\n'
 sys.stderr = sys.stdout
 sys.path.append('/home/ecprice/.local/lib/python2.5/site-packages')
 
@@ -22,8 +21,33 @@ from sipb_xen_database import *
 import random
 
 class MyException(Exception):
+    """Base class for my exceptions"""
     pass
 
+class InvalidInput(MyException):
+    """Exception for user-provided input is invalid but maybe in good faith.
+
+    This would include setting memory to negative (which might be a
+    typo) but not setting an invalid boot CD (which requires bypassing
+    the select box).
+    """
+    pass
+
+class CodeError(MyException):
+    """Exception for internal errors or bad faith input."""
+    pass
+
+
+
+def helppopup(subj):
+    """Return HTML code for a (?) link to a specified help topic"""
+    return '<span class="helplink"><a href="help?subject='+subj+'&amp;simple=true" target="_blank" onclick="return helppopup(\''+subj+'\')">(?)</a></span>'
+
+
+global_dict = {}
+global_dict['helppopup'] = helppopup
+
+
 # ... and stolen from xend/uuid.py
 def randomUUID():
     """Generate a random UUID."""
@@ -31,23 +55,64 @@ def randomUUID():
     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)
 
-def maxMemory(user, machine=None):
-    return 256
+MAX_MEMORY_TOTAL = 512
+MAX_MEMORY_SINGLE = 256
+MIN_MEMORY_SINGLE = 16
+MAX_DISK_TOTAL = 50
+MAX_DISK_SINGLE = 50
+MIN_DISK_SINGLE = 0.1
+MAX_VMS_TOTAL = 10
+MAX_VMS_ACTIVE = 4
+
+def getMachinesByOwner(owner):
+    """Return the machines owned by a given owner."""
+    return Machine.select_by(owner=owner)
+
+def maxMemory(user, machine=None, on=None):
+    """Return the maximum memory for a machine or a user.
+
+    If machine is None, return the memory available for a new 
+    machine.  Else, return the maximum that machine can have.
+
+    on is a dictionary from machines to booleans, whether a machine is
+    on.  If None, it is recomputed. XXX make this global?
+    """
+
+    machines = getMachinesByOwner(user.username)
+    if on is None:
+        on = getUptimes(machines)
+    active_machines = [x for x in machines if on[x]]
+    mem_usage = sum([x.memory for x in active_machines if x != machine])
+    return min(MAX_MEMORY_SINGLE, MAX_MEMORY_TOTAL-mem_usage)
 
 def maxDisk(user, machine=None):
-    return 10.0
+    machines = getMachinesByOwner(user.username)
+    disk_usage = sum([sum([y.size for y in x.disks])
+                      for x in machines if x != machine])
+    return min(MAX_DISK_SINGLE, MAX_DISK_TOTAL-disk_usage/1024.)
+
+def canAddVm(user, on=None):
+    machines = getMachinesByOwner(user.username)
+    if on is None:
+        on = getUptimes(machines)
+    active_machines = [x for x in machines if on[x]]
+    return (len(machines) < MAX_VMS_TOTAL and
+            len(active_machines) < MAX_VMS_ACTIVE)
 
 def haveAccess(user, machine):
+    """Return whether a user has access to a machine"""
     if user.username == 'moo':
         return True
     return machine.owner == user.username
 
 def error(op, user, fields, err):
+    """Print an error page when a CodeError occurs"""
     d = dict(op=op, user=user, errorMessage=str(err))
-    print Template(file='error.tmpl', searchList=d);
+    print Template(file='error.tmpl', searchList=[d, global_dict]);
 
 def validMachineName(name):
     """Check that name is valid for a machine name"""
@@ -56,7 +121,10 @@ def validMachineName(name):
     charset = string.ascii_letters + string.digits + '-_'
     if name[0] in '-_' or len(name) > 22:
         return False
-    return all(x in charset for x in name)
+    for x in name:
+        if x not in charset:
+            return False
+    return True
 
 def kinit(username = 'tabbott/extra', keytab = '/etc/tabbott.keytab'):
     """Kinit with a given username and keytab"""
@@ -65,7 +133,7 @@ def kinit(username = 'tabbott/extra', keytab = '/etc/tabbott.keytab'):
                          stderr=subprocess.PIPE)
     e = p.wait()
     if e:
-        raise MyException("Error %s in kinit: %s" % (e, p.stderr.read()))
+        raise CodeError("Error %s in kinit: %s" % (e, p.stderr.read()))
 
 def checkKinit():
     """If we lack tickets, kinit."""
@@ -84,10 +152,11 @@ def remctl(*args, **kws):
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
     if kws.get('err'):
+        p.wait()
         return p.stdout.read(), p.stderr.read()
     if p.wait():
-        print >> sys.stderr, 'ERROR on remctl ', args
-        print >> sys.stderr, p.stderr.read()
+        raise CodeError('ERROR on remctl %s: %s' %
+                          (args, p.stderr.read()))
     return p.stdout.read()
 
 def makeDisks():
@@ -143,12 +212,15 @@ def getUptimes(machines):
     value_string = remctl('web', 'listvms')
     lines = value_string.splitlines()
     d = {}
-    for line in lines[1:]:
+    for line in lines:
         lst = line.split()
         name, id = lst[:2]
         uptime = ' '.join(lst[2:])
         d[name] = uptime
-    return d
+    ans = {}
+    for m in machines:
+        ans[m] = d.get(m.name)
+    return ans
 
 def statusInfo(machine):
     """Return the status list for a given machine.
@@ -157,11 +229,11 @@ def statusInfo(machine):
     """
     value_string, err_string = remctl('list-long', machine.name, err=True)
     if 'Unknown command' in err_string:
-        raise MyException("ERROR in remctl list-long %s is not registered" % (machine.name,))
+        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 MyException("ERROR in remctl list-long %s:  %s" % (machine.name, err_string))
+        raise CodeError("ERROR in remctl list-long %s:  %s" % (machine.name, err_string))
     status = parseStatus(value_string)
     return status
 
@@ -180,6 +252,12 @@ def createVm(user, name, memory, disk, is_hvm, cdrom):
     # put stuff in the table
     transaction = ctx.current.create_transaction()
     try:
+        if memory > maxMemory(user):
+            raise InvalidInput("Too much memory requested")
+        if disk > maxDisk(user) * 1024:
+            raise InvalidInput("Too much disk requested")
+        if not canAddVm(user):
+            raise InvalidInput("Too many VMs requested")
         res = meta.engine.execute('select nextval(\'"machines_machine_id_seq"\')')
         id = res.fetchone()[0]
         machine = Machine()
@@ -197,7 +275,7 @@ def createVm(user, name, memory, disk, is_hvm, cdrom):
                     'hda', disk)
         open = NIC.select_by(machine_id=None)
         if not open: #No IPs left!
-            return "No IP addresses left!  Contact sipb-xen-dev@mit.edu"
+            raise CodeError("No IP addresses left!  Contact sipb-xen-dev@mit.edu")
         nic = open[0]
         nic.machine_id = machine.machine_id
         nic.hostname = name
@@ -207,44 +285,49 @@ def createVm(user, name, memory, disk, is_hvm, cdrom):
     except:
         transaction.rollback()
         raise
-    makeDisks()
     registerMachine(machine)
+    makeDisks()
     # tell it to boot with cdrom
     bootMachine(machine, cdrom)
 
     return machine
 
 def validMemory(user, memory, machine=None):
+    """Parse and validate limits for memory for a given user and machine."""
     try:
         memory = int(memory)
-        if memory <= 0:
+        if memory < MIN_MEMORY_SINGLE:
             raise ValueError
     except ValueError:
-        raise MyException("Invalid memory amount")
+        raise InvalidInput("Invalid memory amount; must be at least %s MB" %
+                          MIN_MEMORY_SINGLE)
     if memory > maxMemory(user, machine):
-        raise MyException("Too much memory requested")
+        raise InvalidInput("Too much memory requested")
     return memory
 
 def validDisk(user, disk, machine=None):
+    """Parse and validate limits for disk for a given user and machine."""
     try:
         disk = float(disk)
         if disk > maxDisk(user, machine):
-            raise MyException("Too much disk requested")
+            raise InvalidInput("Too much disk requested")
         disk = int(disk * 1024)
-        if disk <= 0:
+        if disk < MIN_DISK_SINGLE * 1024:
             raise ValueError
     except ValueError:
-        raise MyException("Invalid disk amount")
+        raise InvalidInput("Invalid disk amount; minimum is %s GB" %
+                          MIN_DISK_SINGLE)
     return disk
 
 def create(user, fields):
+    """Handler for create requests."""
     name = fields.getfirst('name')
     if not validMachineName(name):
-        raise MyException("Invalid name '%s'" % name)
+        raise InvalidInput("Invalid name '%s'" % name)
     name = user.username + '_' + name.lower()
 
     if Machine.get_by(name=name):
-        raise MyException("A machine named '%s' already exists" % name)
+        raise InvalidInput("A machine named '%s' already exists" % name)
     
     memory = fields.getfirst('memory')
     memory = validMemory(user, memory)
@@ -254,60 +337,67 @@ def create(user, fields):
 
     vm_type = fields.getfirst('vmtype')
     if vm_type not in ('hvm', 'paravm'):
-        raise MyException("Invalid vm type '%s'"  % vm_type)    
+        raise CodeError("Invalid vm type '%s'"  % vm_type)    
     is_hvm = (vm_type == 'hvm')
 
     cdrom = fields.getfirst('cdrom')
     if cdrom is not None and not CDROM.get(cdrom):
-        raise MyException("Invalid cdrom type '%s'" % cdrom)    
+        raise CodeError("Invalid cdrom type '%s'" % cdrom)    
     
     machine = createVm(user, name, memory, disk, is_hvm, cdrom)
-    if isinstance(machine, basestring):
-        raise MyException(machine)
     d = dict(user=user,
              machine=machine)
     print Template(file='create.tmpl',
-                   searchList=d);
+                   searchList=[d, global_dict]);
 
 def listVms(user, fields):
+    """Handler for list requests."""
     machines = [m for m in Machine.select() if haveAccess(user, m)]    
     on = {}
     has_vnc = {}
     uptimes = getUptimes(machines)
     on = uptimes
     for m in machines:
-        if not on.get(m.name):
-            has_vnc[m.name] = 'Off'
+        if not on[m]:
+            has_vnc[m] = 'Off'
         elif m.type.hvm:
-            has_vnc[m.name] = True
+            has_vnc[m] = True
         else:
-            help_name = 'paravm_console'
-            has_vnc[m.name] = 'ParaVM <span class="helplink"><a href="help?subject=%s&amp;simple=true" target="_blank" onclick="return helppopup(\'%s\')">(?)</a></span>' % (help_name, help_name)
+            has_vnc[m] = "ParaVM"+helppopup("paravm_console")
     #     for m in machines:
     #         status = statusInfo(m)
     #         on[m.name] = status is not None
     #         has_vnc[m.name] = hasVnc(status)
+    max_mem=maxMemory(user, on=on)
+    max_disk=maxDisk(user)
     d = dict(user=user,
-             maxmem=maxMemory(user),
-             maxdisk=maxDisk(user),
+             can_add_vm=canAddVm(user, on=on),
+             max_mem=max_mem,
+             max_disk=max_disk,
+             default_mem=max_mem,
+             default_disk=min(4.0, max_disk),
              machines=machines,
              has_vnc=has_vnc,
              uptimes=uptimes,
              cdroms=CDROM.select())
-    print Template(file='list.tmpl', searchList=d)
+    print Template(file='list.tmpl', searchList=[d, global_dict])
 
 def testMachineId(user, machineId, exists=True):
+    """Parse, validate and check authorization for a given machineId.
+
+    If exists is False, don't check that it exists.
+    """
     if machineId is None:
-        raise MyException("No machine ID specified")
+        raise CodeError("No machine ID specified")
     try:
         machineId = int(machineId)
     except ValueError:
-        raise MyException("Invalid machine ID '%s'" % machineId)
+        raise CodeError("Invalid machine ID '%s'" % machineId)
     machine = Machine.get(machineId)
     if exists and machine is None:
-        raise MyException("No such machine ID '%s'" % machineId)
-    if not haveAccess(user, machine):
-        raise MyException("No access to machine ID '%s'" % machineId)
+        raise CodeError("No such machine ID '%s'" % machineId)
+    if machine is not None and not haveAccess(user, machine):
+        raise CodeError("No access to machine ID '%s'" % machineId)
     return machine
 
 def vnc(user, fields):
@@ -323,9 +413,11 @@ def vnc(user, fields):
     -t nat -A PREROUTING -s ! 18.181.0.60 -i eth1 -p tcp -m tcp --dport 10003 -j DNAT --to-destination 18.181.0.60:10003 
     -t nat -A POSTROUTING -d 18.181.0.60 -o eth1 -p tcp -m tcp --dport 10003 -j SNAT --to-source 18.187.7.142 
     -A FORWARD -d 18.181.0.60 -i eth1 -o eth1 -p tcp -m tcp --dport 10003 -j ACCEPT
+
+    Remember to enable iptables!
+    echo 1 > /proc/sys/net/ipv4/ip_forward
     """
     machine = testMachineId(user, fields.getfirst('machine_id'))
-    #XXX fix
     
     TOKEN_KEY = "0M6W0U1IXexThi5idy8mnkqPKEq1LtEnlK/pZSn0cDrN"
 
@@ -345,9 +437,14 @@ def vnc(user, fields):
              hostname=os.environ.get('SERVER_NAME', 'localhost'),
              authtoken=token)
     print Template(file='vnc.tmpl',
-                   searchList=d)
+                   searchList=[d, global_dict])
 
 def getNicInfo(data_dict, machine):
+    """Helper function for info, get data on nics for a machine.
+
+    Modifies data_dict to include the relevant data, and returns a list
+    of (key, name) pairs to display "name: data_dict[key]" to the user.
+    """
     data_dict['num_nics'] = len(machine.nics)
     nic_fields_template = [('nic%s_hostname', 'NIC %s hostname'),
                            ('nic%s_mac', 'NIC %s MAC Addr'),
@@ -364,6 +461,11 @@ def getNicInfo(data_dict, machine):
     return nic_fields
 
 def getDiskInfo(data_dict, machine):
+    """Helper function for info, get data on disks for a machine.
+
+    Modifies data_dict to include the relevant data, and returns a list
+    of (key, name) pairs to display "name: data_dict[key]" to the user.
+    """
     data_dict['num_disks'] = len(machine.disks)
     disk_fields_template = [('%s_size', '%s size')]
     disk_fields = []
@@ -374,6 +476,7 @@ def getDiskInfo(data_dict, machine):
     return disk_fields
 
 def deleteVM(machine):
+    """Delete a VM."""
     transaction = ctx.current.create_transaction()
     delete_disk_pairs = [(machine.name, d.guest_device_name) for d in machine.disks]
     try:
@@ -393,21 +496,24 @@ def deleteVM(machine):
     unregisterMachine(machine)
 
 def command(user, fields):
+    """Handler for running commands like boot and delete on a VM."""
     print time.time()-start_time
     machine = testMachineId(user, fields.getfirst('machine_id'))
     action = fields.getfirst('action')
     cdrom = fields.getfirst('cdrom')
     print time.time()-start_time
     if cdrom is not None and not CDROM.get(cdrom):
-        raise MyException("Invalid cdrom type '%s'" % cdrom)    
+        raise CodeError("Invalid cdrom type '%s'" % cdrom)    
     if action not in ('Reboot', 'Power on', 'Power off', 'Shutdown', 'Delete VM'):
-        raise MyException("Invalid action '%s'" % action)
+        raise CodeError("Invalid action '%s'" % action)
     if action == 'Reboot':
         if cdrom is not None:
             remctl('reboot', machine.name, cdrom)
         else:
             remctl('reboot', machine.name)
     elif action == 'Power on':
+        if maxMemory(user) < machine.memory:
+            raise InvalidInput("You don't have enough free RAM quota")
         bootMachine(machine, cdrom)
     elif action == 'Power off':
         remctl('destroy', machine.name)
@@ -420,13 +526,38 @@ def command(user, fields):
     d = dict(user=user,
              command=action,
              machine=machine)
-    print Template(file="command.tmpl", searchList=d)
+    print Template(file="command.tmpl", searchList=[d, global_dict])
         
 def modify(user, fields):
+    """Handler for modifying attributes of a machine."""
+    #XXX not written yet
     machine = testMachineId(user, fields.getfirst('machine_id'))
     
+def help(user, fields):
+    """Handler for help messages."""
+    simple = fields.getfirst('simple')
+    subjects = fields.getlist('subject')
+    
+    mapping = dict(paravm_console="""
+ParaVM machines do not support console access over VNC.  To access
+these machines, you either need to boot with a liveCD and ssh in or
+hope that the sipb-xen maintainers add support for serial consoles.""",
+                   hvm_paravm="""
+HVM machines use the virtualization features of the processor, while
+ParaVM machines use Xen's emulation of virtualization features.  You
+want an HVM virtualized machine.""",
+                   cpu_weight="""Don't ask us!  We're as mystified as you are.""")
+    
+    d = dict(user=user,
+             simple=simple,
+             subjects=subjects,
+             mapping=mapping)
+    
+    print Template(file="help.tmpl", searchList=[d, global_dict])
+    
 
 def info(user, fields):
+    """Handler for info on a single VM."""
     machine = testMachineId(user, fields.getfirst('machine_id'))
     status = statusInfo(machine)
     has_vnc = hasVnc(status)
@@ -451,7 +582,7 @@ def info(user, fields):
                       ('memory', 'RAM'),
                       'DISK_INFO',
                       ('state', 'state (xen format)'),
-                      ('cpu_weight', 'CPU weight'),
+                      ('cpu_weight', 'CPU weight'+helppopup('cpu_weight')),
                       ('on_reboot', 'Action on VM reboot'),
                       ('on_poweroff', 'Action on VM poweroff'),
                       ('on_crash', 'Action on VM crash'),
@@ -461,6 +592,7 @@ def info(user, fields):
                       ]
     fields = []
     machine_info = {}
+    machine_info['name'] = machine.name
     machine_info['type'] = machine.type.hvm and 'HVM' or 'ParaVM'
     machine_info['owner'] = machine.owner
     machine_info['contact'] = machine.contact
@@ -477,14 +609,15 @@ def info(user, fields):
     for field, disp in display_fields:
         if field in ('uptime', 'cputime'):
             fields.append((disp, locals()[field]))
-        elif field in main_status:
-            fields.append((disp, main_status[field]))
         elif field in machine_info:
             fields.append((disp, machine_info[field]))
+        elif field in main_status:
+            fields.append((disp, main_status[field]))
         else:
             pass
             #fields.append((disp, None))
-
+    max_mem = maxMemory(user, machine)
+    max_disk = maxDisk(user, machine)
     d = dict(user=user,
              cdroms=CDROM.select(),
              on=status is not None,
@@ -492,18 +625,19 @@ def info(user, fields):
              has_vnc=has_vnc,
              uptime=str(uptime),
              ram=machine.memory,
-             maxmem=maxMemory(user, machine),
-             maxdisk=maxDisk(user, machine),
+             max_mem=max_mem,
+             max_disk=max_disk,
              fields = fields)
     print Template(file='info.tmpl',
-                   searchList=d)
+                   searchList=[d, global_dict])
 
 mapping = dict(list=listVms,
                vnc=vnc,
                command=command,
                modify=modify,
                info=info,
-               create=create)
+               create=create,
+               help=help)
 
 if __name__ == '__main__':
     start_time = time.time()
@@ -512,11 +646,22 @@ if __name__ == '__main__':
         username = "moo"
         email = 'moo@cow.com'
     u = User()
+    if 'SSL_CLIENT_S_DN_Email' in os.environ:
+        username = os.environ[ 'SSL_CLIENT_S_DN_Email'].split("@")[0]
+        u.username = username
+        u.email = os.environ[ 'SSL_CLIENT_S_DN_Email']
+    else:
+        u.username = 'moo'
+        u.email = 'nobody'
     connect('postgres://sipb-xen@sipb-xen-dev/sipb_xen')
     operation = os.environ.get('PATH_INFO', '')
+    #print 'Content-Type: text/plain\n'
+    #print operation
     if not operation:
-        pass
-        #XXX do redirect
+        print "Status: 301 Moved Permanently"
+        print 'Location: ' + os.environ['SCRIPT_NAME']+'/\n'
+        sys.exit(0)
+    print 'Content-Type: text/html\n'
 
     if operation.startswith('/'):
         operation = operation[1:]
@@ -527,7 +672,11 @@ if __name__ == '__main__':
                       lambda u, e:
                           error(operation, u, e,
                                 "Invalid operation '%s'" % operation))
+    if fun not in (help, ):
+        connect('postgres://sipb-xen@sipb-xen-dev/sipb_xen')
     try:
         fun(u, fields)
-    except MyException, err:
+    except CodeError, err:
+        error(operation, u, fields, err)
+    except InvalidInput, err:
         error(operation, u, fields, err)