Avoid using os.environ in wsgi.

[invirt/packages/invirt-web.git] / code / main.py

diff --git a/code/main.py b/code/main.py
index ce523cb..3d880c1 100755 (executable)
--- a/code/main.py
+++ b/code/main.py
@@ -6,7 +6,6 @@ import cPickle
 import cgi
 import datetime
 import hmac
 import cgi
 import datetime
 import hmac

-import os

 import sha
 import simplejson
 import sys
 import sha
 import simplejson
 import sys

@@ -41,7 +40,7 @@ import sipb_xen_database
 from sipb_xen_database import Machine, CDROM, ctx, connect, MachineAccess, Type, Autoinstall
 import validation
 import cache_acls
 from sipb_xen_database import Machine, CDROM, ctx, connect, MachineAccess, Type, Autoinstall
 import validation
 import cache_acls

-from webcommon import InvalidInput, CodeError, g
+from webcommon import InvalidInput, CodeError, State

 import controls
 
 class Checkpoint:
 import controls
 
 class Checkpoint:

@@ -119,15 +118,15 @@ class Defaults:
 
 DEFAULT_HEADERS = {'Content-Type': 'text/html'}
 
 
 DEFAULT_HEADERS = {'Content-Type': 'text/html'}
 

-def error(op, user, fields, err, emsg):
+def error(op, username, fields, err, emsg):

     """Print an error page when a CodeError occurs"""
     """Print an error page when a CodeError occurs"""

-    d = dict(op=op, user=user, errorMessage=str(err),
+    d = dict(op=op, user=username, errorMessage=str(err),

              stderr=emsg)
     return templates.error(searchList=[d])
 
              stderr=emsg)
     return templates.error(searchList=[d])
 

-def invalidInput(op, user, fields, err, emsg):
+def invalidInput(op, username, fields, err, emsg):

     """Print an error page when an InvalidInput exception occurs"""
     """Print an error page when an InvalidInput exception occurs"""

-    d = dict(op=op, user=user, err_field=err.err_field,
+    d = dict(op=op, user=username, err_field=err.err_field,

              err_value=str(err.err_value), stderr=emsg,
              errorMessage=str(err))
     return templates.invalid(searchList=[d])
              err_value=str(err.err_value), stderr=emsg,
              errorMessage=str(err))
     return templates.invalid(searchList=[d])

@@ -142,49 +141,25 @@ def hasVnc(status):
             return 'location' in d
     return False
 
             return 'location' in d
     return False
 

-def parseCreate(user, fields):
-    name = fields.getfirst('name')
-    if not validation.validMachineName(name):
-        raise InvalidInput('name', name, 'You must provide a machine name.  Max 22 chars, alnum plus \'-\' and \'_\'.')
-    name = name.lower()
+def parseCreate(username, state, fields):
+    kws = dict([(kw, fields.getfirst(kw)) for kw in 'name owner memory disksize vmtype cdrom clone_from'.split()])
+    validate = validation.Validate(username, state, strict=True, **kws)
+    return dict(contact=username, name=validate.name, memory=validate.memory,
+                disksize=validate.disksize, owner=validate.owner, machine_type=validate.vmtype,
+                cdrom=getattr(validate, 'cdrom', None),
+                clone_from=getattr(validate, 'clone_from', None))

 
 

-    if Machine.get_by(name=name):
-        raise InvalidInput('name', name,
-                           "Name already exists.")
-
-    owner = validation.testOwner(user, fields.getfirst('owner'))
-
-    memory = fields.getfirst('memory')
-    memory = validation.validMemory(owner, memory, on=True)
-
-    disk_size = fields.getfirst('disk')
-    disk_size = validation.validDisk(owner, disk_size)
-
-    vm_type = fields.getfirst('vmtype')
-    vm_type = validation.validVmType(vm_type)
-
-    cdrom = fields.getfirst('cdrom')
-    if cdrom is not None and not CDROM.get(cdrom):
-        raise CodeError("Invalid cdrom type '%s'" % cdrom)
-
-    clone_from = fields.getfirst('clone_from')
-    if clone_from and clone_from != 'ice3':
-        raise CodeError("Invalid clone image '%s'" % clone_from)
-
-    return dict(contact=user, name=name, memory=memory, disk_size=disk_size,
-                owner=owner, machine_type=vm_type, cdrom=cdrom, clone_from=clone_from)
-
-def create(user, fields):
+def create(username, state, fields):

     """Handler for create requests."""
     try:
     """Handler for create requests."""
     try:

-        parsed_fields = parseCreate(user, fields)
-        machine = controls.createVm(**parsed_fields)
+        parsed_fields = parseCreate(username, state, fields)
+        machine = controls.createVm(username, state, **parsed_fields)

     except InvalidInput, err:
         pass
     else:
         err = None
     except InvalidInput, err:
         pass
     else:
         err = None

-    g.clear() #Changed global state
-    d = getListDict(user)
+    state.clear() #Changed global state
+    d = getListDict(username, state)

     d['err'] = err
     if err:
         for field in fields.keys():
     d['err'] = err
     if err:
         for field in fields.keys():

@@ -194,15 +169,16 @@ def create(user, fields):
     return templates.list(searchList=[d])
 
 
     return templates.list(searchList=[d])
 
 

-def getListDict(user):
+def getListDict(username, state):

     """Gets the list of local variables used by list.tmpl."""
     checkpoint.checkpoint('Starting')
     """Gets the list of local variables used by list.tmpl."""
     checkpoint.checkpoint('Starting')

-    machines = g.machines
+    machines = state.machines

     checkpoint.checkpoint('Got my machines')
     on = {}
     has_vnc = {}
     checkpoint.checkpoint('Got my machines')
     on = {}
     has_vnc = {}

-    xmlist = g.xmlist
+    xmlist = state.xmlist

     checkpoint.checkpoint('Got uptimes')
     checkpoint.checkpoint('Got uptimes')

+    can_clone = 'ice3' not in state.xmlist_raw

     for m in machines:
         if m not in xmlist:
             has_vnc[m] = 'Off'
     for m in machines:
         if m not in xmlist:
             has_vnc[m] = 'Off'

@@ -215,34 +191,35 @@ def getListDict(user):
                 has_vnc[m] = "WTF?"
             else:
                 has_vnc[m] = "ParaVM"+helppopup("ParaVM Console")
                 has_vnc[m] = "WTF?"
             else:
                 has_vnc[m] = "ParaVM"+helppopup("ParaVM Console")

-    max_memory = validation.maxMemory(user)
-    max_disk = validation.maxDisk(user)
+    max_memory = validation.maxMemory(username, state)
+    max_disk = validation.maxDisk(username)

     checkpoint.checkpoint('Got max mem/disk')
     defaults = Defaults(max_memory=max_memory,
                         max_disk=max_disk,
     checkpoint.checkpoint('Got max mem/disk')
     defaults = Defaults(max_memory=max_memory,
                         max_disk=max_disk,

-                        owner=user,
+                        owner=username,

                         cdrom='gutsy-i386')
     checkpoint.checkpoint('Got defaults')
     def sortkey(machine):
                         cdrom='gutsy-i386')
     checkpoint.checkpoint('Got defaults')
     def sortkey(machine):

-        return (machine.owner != user, machine.owner, machine.name)
+        return (machine.owner != username, machine.owner, machine.name)

     machines = sorted(machines, key=sortkey)
     machines = sorted(machines, key=sortkey)

-    d = dict(user=user,
-             cant_add_vm=validation.cantAddVm(user),
+    d = dict(user=username,
+             cant_add_vm=validation.cantAddVm(username, state),

              max_memory=max_memory,
              max_disk=max_disk,
              defaults=defaults,
              machines=machines,
              max_memory=max_memory,
              max_disk=max_disk,
              defaults=defaults,
              machines=machines,

-             has_vnc=has_vnc)
+             has_vnc=has_vnc,
+             can_clone=can_clone)

     return d
 
     return d
 

-def listVms(user, fields):
+def listVms(username, state, fields):

     """Handler for list requests."""
     checkpoint.checkpoint('Getting list dict')
     """Handler for list requests."""
     checkpoint.checkpoint('Getting list dict')

-    d = getListDict(user)
+    d = getListDict(username, state)

     checkpoint.checkpoint('Got list dict')
     return templates.list(searchList=[d])
 
     checkpoint.checkpoint('Got list dict')
     return templates.list(searchList=[d])
 

-def vnc(user, fields):
+def vnc(username, state, fields):

     """VNC applet page.
 
     Note that due to same-domain restrictions, the applet connects to
     """VNC applet page.
 
     Note that due to same-domain restrictions, the applet connects to

@@ -262,12 +239,12 @@ def vnc(user, fields):
     Remember to enable iptables!
     echo 1 > /proc/sys/net/ipv4/ip_forward
     """
     Remember to enable iptables!
     echo 1 > /proc/sys/net/ipv4/ip_forward
     """

-    machine = validation.testMachineId(user, fields.getfirst('machine_id'))
+    machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine

 
     TOKEN_KEY = "0M6W0U1IXexThi5idy8mnkqPKEq1LtEnlK/pZSn0cDrN"
 
     data = {}
 
     TOKEN_KEY = "0M6W0U1IXexThi5idy8mnkqPKEq1LtEnlK/pZSn0cDrN"
 
     data = {}

-    data["user"] = user
+    data["user"] = username

     data["machine"] = machine.name
     data["expires"] = time.time()+(5*60)
     pickled_data = cPickle.dumps(data)
     data["machine"] = machine.name
     data["expires"] = time.time()+(5*60)
     pickled_data = cPickle.dumps(data)

@@ -280,11 +257,11 @@ def vnc(user, fields):
     status = controls.statusInfo(machine)
     has_vnc = hasVnc(status)
 
     status = controls.statusInfo(machine)
     has_vnc = hasVnc(status)
 

-    d = dict(user=user,
+    d = dict(user=username,

              on=status,
              has_vnc=has_vnc,
              machine=machine,
              on=status,
              has_vnc=has_vnc,
              machine=machine,

-             hostname=os.environ.get('SERVER_NAME', 'localhost'),
+             hostname=state.environ.get('SERVER_NAME', 'localhost'),

              authtoken=token)
     return templates.vnc(searchList=[d])
 
              authtoken=token)
     return templates.vnc(searchList=[d])
 

@@ -339,36 +316,36 @@ def getDiskInfo(data_dict, machine):
         data_dict['%s_size' % name] = "%0.1f GiB" % (disk.size / 1024.)
     return disk_fields
 
         data_dict['%s_size' % name] = "%0.1f GiB" % (disk.size / 1024.)
     return disk_fields
 

-def command(user, fields):
+def command(username, state, fields):

     """Handler for running commands like boot and delete on a VM."""
     back = fields.getfirst('back')
     try:
     """Handler for running commands like boot and delete on a VM."""
     back = fields.getfirst('back')
     try:

-        d = controls.commandResult(user, fields)
+        d = controls.commandResult(username, state, fields)

         if d['command'] == 'Delete VM':
             back = 'list'
     except InvalidInput, err:
         if not back:
             raise
         if d['command'] == 'Delete VM':
             back = 'list'
     except InvalidInput, err:
         if not back:
             raise

-        #print >> sys.stderr, err
+        print >> sys.stderr, err

         result = err
     else:
         result = 'Success!'
         if not back:
             return templates.command(searchList=[d])
     if back == 'list':
         result = err
     else:
         result = 'Success!'
         if not back:
             return templates.command(searchList=[d])
     if back == 'list':

-        g.clear() #Changed global state
-        d = getListDict(user)
+        state.clear() #Changed global state
+        d = getListDict(username, state)

         d['result'] = result
         return templates.list(searchList=[d])
     elif back == 'info':
         d['result'] = result
         return templates.list(searchList=[d])
     elif back == 'info':

-        machine = validation.testMachineId(user, fields.getfirst('machine_id'))
+        machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine

         return ({'Status': '302',
                  'Location': '/info?machine_id=%d' % machine.machine_id},
                 "You shouldn't see this message.")
     else:
         raise InvalidInput('back', back, 'Not a known back page.')
 
         return ({'Status': '302',
                  'Location': '/info?machine_id=%d' % machine.machine_id},
                 "You shouldn't see this message.")
     else:
         raise InvalidInput('back', back, 'Not a known back page.')
 

-def modifyDict(user, fields):
+def modifyDict(username, state, fields):

     """Modify a machine as specified by CGI arguments.
 
     Return a list of local variables for modify.tmpl.
     """Modify a machine as specified by CGI arguments.
 
     Return a list of local variables for modify.tmpl.

@@ -376,28 +353,19 @@ def modifyDict(user, fields):
     olddisk = {}
     transaction = ctx.current.create_transaction()
     try:
     olddisk = {}
     transaction = ctx.current.create_transaction()
     try:

-        machine = validation.testMachineId(user, fields.getfirst('machine_id'))
-        owner = validation.testOwner(user, fields.getfirst('owner'), machine)
-        admin = validation.testAdmin(user, fields.getfirst('administrator'),
-                                     machine)
-        contact = validation.testContact(user, fields.getfirst('contact'),
-                                         machine)
-        name = validation.testName(user, fields.getfirst('name'), machine)
+        kws = dict([(kw, fields.getfirst(kw)) for kw in 'machine_id owner admin contact name memory vmtype disksize'.split()])
+        validate = validation.Validate(username, state, **kws)
+        machine = validate.machine

         oldname = machine.name
         oldname = machine.name

-        command = "modify"

 
 

-        memory = fields.getfirst('memory')
-        if memory is not None:
-            memory = validation.validMemory(user, memory, machine, on=False)
-            machine.memory = memory
+        if hasattr(validate, 'memory'):
+            machine.memory = validate.memory

 
 

-        vm_type = validation.validVmType(fields.getfirst('vmtype'))
-        if vm_type is not None:
-            machine.type = vm_type
+        if hasattr(validate, 'vmtype'):
+            machine.type = validate.vmtype

 
 

-        disksize = validation.testDisk(user, fields.getfirst('disk'))
-        if disksize is not None:
-            disksize = validation.validDisk(user, disksize, machine)
+        if hasattr(validate, 'disksize'):
+            disksize = validate.disksize

             disk = machine.disks[0]
             if disk.size != disksize:
                 olddisk[disk.guest_device_name] = disksize
             disk = machine.disks[0]
             if disk.size != disksize:
                 olddisk[disk.guest_device_name] = disksize

@@ -405,19 +373,20 @@ def modifyDict(user, fields):
                 ctx.current.save(disk)
 
         update_acl = False
                 ctx.current.save(disk)
 
         update_acl = False

-        if owner is not None and owner != machine.owner:
-            machine.owner = owner
+        if hasattr(validate, 'owner') and validate.owner != machine.owner:
+            machine.owner = validate.owner

             update_acl = True
             update_acl = True

-        if name is not None:
+        if hasattr(validate, 'name'):

             machine.name = name
             machine.name = name

-        if admin is not None and admin != machine.administrator:
-            machine.administrator = admin
+        if hasattr(validate, 'admin') and validate.admin != machine.administrator:
+            machine.administrator = validate.admin

             update_acl = True
             update_acl = True

-        if contact is not None:
-            machine.contact = contact
+        if hasattr(validate, 'contact'):
+            machine.contact = validate.contact

 
         ctx.current.save(machine)
         if update_acl:
 
         ctx.current.save(machine)
         if update_acl:

+            print >> sys.stderr, machine, machine.administrator

             cache_acls.refreshMachine(machine)
         transaction.commit()
     except:
             cache_acls.refreshMachine(machine)
         transaction.commit()
     except:

@@ -425,24 +394,24 @@ def modifyDict(user, fields):
         raise
     for diskname in olddisk:
         controls.resizeDisk(oldname, diskname, str(olddisk[diskname]))
         raise
     for diskname in olddisk:
         controls.resizeDisk(oldname, diskname, str(olddisk[diskname]))

-    if name is not None:
-        controls.renameMachine(machine, oldname, name)
-    return dict(user=user,
-                command=command,
+    if hasattr(validate, 'name'):
+        controls.renameMachine(machine, oldname, validate.name)
+    return dict(user=username,
+                command="modify",

                 machine=machine)
 
                 machine=machine)
 

-def modify(user, fields):
+def modify(username, state, fields):

     """Handler for modifying attributes of a machine."""
     try:
     """Handler for modifying attributes of a machine."""
     try:

-        modify_dict = modifyDict(user, fields)
+        modify_dict = modifyDict(username, state, fields)

     except InvalidInput, err:
         result = None
     except InvalidInput, err:
         result = None

-        machine = validation.testMachineId(user, fields.getfirst('machine_id'))
+        machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine

     else:
         machine = modify_dict['machine']
         result = 'Success!'
         err = None
     else:
         machine = modify_dict['machine']
         result = 'Success!'
         err = None

-    info_dict = infoDict(user, machine)
+    info_dict = infoDict(username, machine)

     info_dict['err'] = err
     if err:
         for field in fields.keys():
     info_dict['err'] = err
     if err:
         for field in fields.keys():

@@ -451,7 +420,7 @@ def modify(user, fields):
     return templates.info(searchList=[info_dict])
 
 
     return templates.info(searchList=[info_dict])
 
 

-def helpHandler(user, fields):
+def helpHandler(username, state, fields):

     """Handler for help messages."""
     simple = fields.getfirst('simple')
     subjects = fields.getlist('subject')
     """Handler for help messages."""
     simple = fields.getfirst('simple')
     subjects = fields.getlist('subject')

@@ -494,7 +463,7 @@ console will suffer artifacts.
     if not subjects:
         subjects = sorted(help_mapping.keys())
 
     if not subjects:
         subjects = sorted(help_mapping.keys())
 

-    d = dict(user=user,
+    d = dict(user=username,

              simple=simple,
              subjects=subjects,
              mapping=help_mapping)
              simple=simple,
              subjects=subjects,
              mapping=help_mapping)

@@ -502,11 +471,11 @@ console will suffer artifacts.
     return templates.help(searchList=[d])
 
 
     return templates.help(searchList=[d])
 
 

-def badOperation(u, e):
+def badOperation(u, s, e):

     """Function called when accessing an unknown URI."""
     raise CodeError("Unknown operation")
 
     """Function called when accessing an unknown URI."""
     raise CodeError("Unknown operation")
 

-def infoDict(user, machine):
+def infoDict(username, state, machine):

     """Get the variables used by info.tmpl."""
     status = controls.statusInfo(machine)
     checkpoint.checkpoint('Getting status info')
     """Get the variables used by info.tmpl."""
     status = controls.statusInfo(machine)
     checkpoint.checkpoint('Getting status info')

@@ -577,16 +546,16 @@ def infoDict(user, machine):
     checkpoint.checkpoint('Got fields')
 
 
     checkpoint.checkpoint('Got fields')
 
 

-    max_mem = validation.maxMemory(user, machine, False)
+    max_mem = validation.maxMemory(machine.owner, state, machine, False)

     checkpoint.checkpoint('Got mem')
     checkpoint.checkpoint('Got mem')

-    max_disk = validation.maxDisk(user, machine)
+    max_disk = validation.maxDisk(machine.owner, machine)

     defaults = Defaults()
     for name in 'machine_id name administrator owner memory contact'.split():
         setattr(defaults, name, getattr(machine, name))
     defaults.type = machine.type.type_id
     defaults.disk = "%0.2f" % (machine.disks[0].size/1024.)
     checkpoint.checkpoint('Got defaults')
     defaults = Defaults()
     for name in 'machine_id name administrator owner memory contact'.split():
         setattr(defaults, name, getattr(machine, name))
     defaults.type = machine.type.type_id
     defaults.disk = "%0.2f" % (machine.disks[0].size/1024.)
     checkpoint.checkpoint('Got defaults')

-    d = dict(user=user,
+    d = dict(user=username,

              on=status is not None,
              machine=machine,
              defaults=defaults,
              on=status is not None,
              machine=machine,
              defaults=defaults,

@@ -599,14 +568,14 @@ def infoDict(user, machine):
              fields = fields)
     return d
 
              fields = fields)
     return d
 

-def info(user, fields):
+def info(username, state, fields):

     """Handler for info on a single VM."""
     """Handler for info on a single VM."""

-    machine = validation.testMachineId(user, fields.getfirst('machine_id'))
-    d = infoDict(user, machine)
+    machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine
+    d = infoDict(username, state, machine)

     checkpoint.checkpoint('Got infodict')
     return templates.info(searchList=[d])
 
     checkpoint.checkpoint('Got infodict')
     return templates.info(searchList=[d])
 

-def unauthFront(_, fields):
+def unauthFront(_, _2, fields):

     """Information for unauth'd users."""
     return templates.unauth(searchList=[{'simple' : True}])
 
     """Information for unauth'd users."""
     return templates.unauth(searchList=[{'simple' : True}])
 

@@ -626,85 +595,98 @@ def printHeaders(headers):
     print
 
 
     print
 
 

-def getUser():
+def getUser(environ):

     """Return the current user based on the SSL environment variables"""
     """Return the current user based on the SSL environment variables"""

-    email = os.environ.get('SSL_CLIENT_S_DN_Email', None)
+    email = environ.get('SSL_CLIENT_S_DN_Email', None)

     if email is None:
         return None
     if email is None:
         return None

-    return email.split("@")[0]
+    if not email.endswith('@MIT.EDU'):
+        return None
+    return email[:-8]
+
+class App:
+    def __init__(self, environ, start_response):
+        self.environ = environ
+        self.start = start_response
+
+        self.username = getUser(environ)
+        self.state = State(self.username)
+        self.state.environ = environ
+
+    def __iter__(self):
+        fields = cgi.FieldStorage(fp=self.environ['wsgi.input'], environ=self.environ)
+        print >> sys.stderr, fields
+        operation = self.environ.get('PATH_INFO', '')
+        if not operation:
+            self.start("301 Moved Permanently", [('Location',
+                                                  self.environ['SCRIPT_NAME']+'/')])
+            return
+        if self.username is None:
+            operation = 'unauth'
+        if operation.startswith('/'):
+            operation = operation[1:]
+        if not operation:
+            operation = 'list'
+        print 'Starting', operation
+
+        start_time = time.time()
+        fun = mapping.get(operation, badOperation)
+        try:
+            checkpoint.checkpoint('Before')
+            output = fun(self.username, self.state, fields)
+            checkpoint.checkpoint('After')
+
+            headers = dict(DEFAULT_HEADERS)
+            if isinstance(output, tuple):
+                new_headers, output = output
+                headers.update(new_headers)
+            print 'MOO2'
+            e = revertStandardError()
+            if e:
+                if isinstance(output, basestring):
+                    sys.stderr = StringIO()
+                    x = str(output)
+                    print >> sys.stderr, x
+                    print >> sys.stderr, 'XXX'
+                    print >> sys.stderr, e
+                    raise Exception()
+                output.addError(e)
+            output_string =  str(output)
+            checkpoint.checkpoint('output as a string')
+        except Exception, err:
+            if not fields.has_key('js'):
+                if isinstance(err, CodeError):
+                    self.start('500 Internal Server Error', [('Content-Type', 'text/html')])
+                    e = revertStandardError()
+                    s = error(operation, self.username, fields, err, e)
+                    yield str(s)
+                    return
+                if isinstance(err, InvalidInput):
+                    self.start('200 OK', [('Content-Type', 'text/html')])
+                    e = revertStandardError()
+                    yield str(invalidInput(operation, self.username, fields, err, e))
+                    return
+            self.start('500 Internal Server Error', [('Content-Type', 'text/plain')])
+            import traceback
+            yield '''Uh-oh!  We experienced an error.'
+Please email xvm-dev@mit.edu with the contents of this page.'
+----
+%s
+----
+%s
+----''' % (str(err), traceback.format_exc())
+        self.start('200 OK', headers.items())
+        yield output_string
+        if fields.has_key('timedebug'):
+            yield '<pre>%s</pre>' % cgi.escape(str(checkpoint))

 
 

-def main(operation, user, fields):
-    start_time = time.time()
-    fun = mapping.get(operation, badOperation)
+def constructor():
+    connect('postgres://sipb-xen@sipb-xen-dev.mit.edu/sipb_xen')
+    return App

 
 

-    if fun not in (helpHandler, ):
-        connect('postgres://sipb-xen@sipb-xen-dev.mit.edu/sipb_xen')
-    try:
-        checkpoint.checkpoint('Before')
-        output = fun(u, fields)
-        checkpoint.checkpoint('After')
-
-        headers = dict(DEFAULT_HEADERS)
-        if isinstance(output, tuple):
-            new_headers, output = output
-            headers.update(new_headers)
-        e = revertStandardError()
-        if e:
-            output.addError(e)
-        printHeaders(headers)
-        output_string =  str(output)
-        checkpoint.checkpoint('output as a string')
-        print output_string
-        if fields.has_key('timedebug'):
-            print '<pre>%s</pre>' % checkpoint
-    except Exception, err:
-        if not fields.has_key('js'):
-            if isinstance(err, CodeError):
-                print 'Content-Type: text/html\n'
-                e = revertStandardError()
-                print error(operation, u, fields, err, e)
-                sys.exit(1)
-            if isinstance(err, InvalidInput):
-                print 'Content-Type: text/html\n'
-                e = revertStandardError()
-                print invalidInput(operation, u, fields, err, e)
-                sys.exit(1)
-        print 'Content-Type: text/plain\n'
-        print 'Uh-oh!  We experienced an error.'
-        print 'Please email xvm-dev@mit.edu with the contents of this page.'
-        print '----'
-        e = revertStandardError()
-        print e
-        print '----'
-        raise
+def main():
+    from flup.server.fcgi_fork import WSGIServer
+    WSGIServer(constructor()).run()

 
 if __name__ == '__main__':
 
 if __name__ == '__main__':

-    fields = cgi.FieldStorage()
-
-    if fields.has_key('sqldebug'):
-        import logging
-        logging.basicConfig()
-        logging.getLogger('sqlalchemy.engine').setLevel(logging.INFO)
-        logging.getLogger('sqlalchemy.orm.unitofwork').setLevel(logging.INFO)
-
-    u = getUser()
-    g.user = u
-    operation = os.environ.get('PATH_INFO', '')
-    if not operation:
-        print "Status: 301 Moved Permanently"
-        print 'Location: ' + os.environ['SCRIPT_NAME']+'/\n'
-        sys.exit(0)
-
-    if u is None:
-        operation = 'unauth'
-
-    if operation.startswith('/'):
-        operation = operation[1:]
-    if not operation:
-        operation = 'list'
-
-    if os.getenv("SIPB_XEN_PROFILE"):
-        import profile
-        profile.run('main(operation, u, fields)', 'log-'+operation)
-    else:
-        main(operation, u, fields)
+    main()