source: trunk/packages/invirt-web/code/main.py @ 1706

Last change on this file since 1706 was 1706, checked in by price, 16 years ago

correct reason why you can't walk into a fresh autoinstall by ssh

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1#!/usr/bin/python
2"""Main CGI script for web interface"""
3
4import base64
5import cPickle
6import cgi
7import datetime
8import hmac
9import random
10import sha
11import simplejson
12import sys
13import time
14import urllib
15from StringIO import StringIO
16
17def revertStandardError():
18    """Move stderr to stdout, and return the contents of the old stderr."""
19    errio = sys.stderr
20    if not isinstance(errio, StringIO):
21        return ''
22    sys.stderr = sys.stdout
23    errio.seek(0)
24    return errio.read()
25
26def printError():
27    """Revert stderr to stdout, and print the contents of stderr"""
28    if isinstance(sys.stderr, StringIO):
29        print revertStandardError()
30
31if __name__ == '__main__':
32    import atexit
33    atexit.register(printError)
34
35import templates
36from Cheetah.Template import Template
37import validation
38import cache_acls
39from webcommon import State
40import controls
41from getafsgroups import getAfsGroupMembers
42from invirt import database
43from invirt.database import Machine, CDROM, session, connect, MachineAccess, Type, Autoinstall
44from invirt.config import structs as config
45from invirt.common import InvalidInput, CodeError
46
47def pathSplit(path):
48    if path.startswith('/'):
49        path = path[1:]
50    i = path.find('/')
51    if i == -1:
52        i = len(path)
53    return path[:i], path[i:]
54
55class Checkpoint:
56    def __init__(self):
57        self.start_time = time.time()
58        self.checkpoints = []
59
60    def checkpoint(self, s):
61        self.checkpoints.append((s, time.time()))
62
63    def __str__(self):
64        return ('Timing info:\n%s\n' %
65                '\n'.join(['%s: %s' % (d, t - self.start_time) for
66                           (d, t) in self.checkpoints]))
67
68checkpoint = Checkpoint()
69
70def jquote(string):
71    return "'" + string.replace('\\', '\\\\').replace("'", "\\'").replace('\n', '\\n') + "'"
72
73def helppopup(subj):
74    """Return HTML code for a (?) link to a specified help topic"""
75    return ('<span class="helplink"><a href="help?' +
76            cgi.escape(urllib.urlencode(dict(subject=subj, simple='true')))
77            +'" target="_blank" ' +
78            'onclick="return helppopup(' + cgi.escape(jquote(subj)) + ')">(?)</a></span>')
79
80def makeErrorPre(old, addition):
81    if addition is None:
82        return
83    if old:
84        return old[:-6]  + '\n----\n' + str(addition) + '</pre>'
85    else:
86        return '<p>STDERR:</p><pre>' + str(addition) + '</pre>'
87
88Template.database = database
89Template.config = config
90Template.helppopup = staticmethod(helppopup)
91Template.err = None
92
93class JsonDict:
94    """Class to store a dictionary that will be converted to JSON"""
95    def __init__(self, **kws):
96        self.data = kws
97        if 'err' in kws:
98            err = kws['err']
99            del kws['err']
100            self.addError(err)
101
102    def __str__(self):
103        return simplejson.dumps(self.data)
104
105    def addError(self, text):
106        """Add stderr text to be displayed on the website."""
107        self.data['err'] = \
108            makeErrorPre(self.data.get('err'), text)
109
110class Defaults:
111    """Class to store default values for fields."""
112    memory = 256
113    disk = 4.0
114    cdrom = ''
115    autoinstall = ''
116    name = ''
117    description = ''
118    type = 'linux-hvm'
119
120    def __init__(self, max_memory=None, max_disk=None, **kws):
121        if max_memory is not None:
122            self.memory = min(self.memory, max_memory)
123        if max_disk is not None:
124            self.max_disk = min(self.disk, max_disk)
125        for key in kws:
126            setattr(self, key, kws[key])
127
128
129
130DEFAULT_HEADERS = {'Content-Type': 'text/html'}
131
132def invalidInput(op, username, fields, err, emsg):
133    """Print an error page when an InvalidInput exception occurs"""
134    d = dict(op=op, user=username, err_field=err.err_field,
135             err_value=str(err.err_value), stderr=emsg,
136             errorMessage=str(err))
137    return templates.invalid(searchList=[d])
138
139def hasVnc(status):
140    """Does the machine with a given status list support VNC?"""
141    if status is None:
142        return False
143    for l in status:
144        if l[0] == 'device' and l[1][0] == 'vfb':
145            d = dict(l[1][1:])
146            return 'location' in d
147    return False
148
149def parseCreate(username, state, fields):
150    kws = dict([(kw, fields.getfirst(kw)) for kw in 'name description owner memory disksize vmtype cdrom autoinstall'.split()])
151    validate = validation.Validate(username, state, strict=True, **kws)
152    return dict(contact=username, name=validate.name, description=validate.description, memory=validate.memory,
153                disksize=validate.disksize, owner=validate.owner, machine_type=validate.vmtype,
154                cdrom=getattr(validate, 'cdrom', None),
155                autoinstall=getattr(validate, 'autoinstall', None))
156
157def create(username, state, path, fields):
158    """Handler for create requests."""
159    try:
160        parsed_fields = parseCreate(username, state, fields)
161        machine = controls.createVm(username, state, **parsed_fields)
162    except InvalidInput, err:
163        pass
164    else:
165        err = None
166    state.clear() #Changed global state
167    d = getListDict(username, state)
168    d['err'] = err
169    if err:
170        for field in fields.keys():
171            setattr(d['defaults'], field, fields.getfirst(field))
172    else:
173        d['new_machine'] = parsed_fields['name']
174    return templates.list(searchList=[d])
175
176
177def getListDict(username, state):
178    """Gets the list of local variables used by list.tmpl."""
179    checkpoint.checkpoint('Starting')
180    machines = state.machines
181    checkpoint.checkpoint('Got my machines')
182    on = {}
183    has_vnc = {}
184    xmlist = state.xmlist
185    checkpoint.checkpoint('Got uptimes')
186    can_clone = 'ice3' not in state.xmlist_raw
187    for m in machines:
188        if m not in xmlist:
189            has_vnc[m] = 'Off'
190            m.uptime = None
191        else:
192            m.uptime = xmlist[m]['uptime']
193            if xmlist[m]['console']:
194                has_vnc[m] = True
195            elif m.type.hvm:
196                has_vnc[m] = "WTF?"
197            else:
198                has_vnc[m] = "ParaVM"+helppopup("ParaVM Console")
199    max_memory = validation.maxMemory(username, state)
200    max_disk = validation.maxDisk(username)
201    checkpoint.checkpoint('Got max mem/disk')
202    defaults = Defaults(max_memory=max_memory,
203                        max_disk=max_disk,
204                        owner=username,
205                        cdrom='gutsy-i386')
206    checkpoint.checkpoint('Got defaults')
207    def sortkey(machine):
208        return (machine.owner != username, machine.owner, machine.name)
209    machines = sorted(machines, key=sortkey)
210    d = dict(user=username,
211             cant_add_vm=validation.cantAddVm(username, state),
212             max_memory=max_memory,
213             max_disk=max_disk,
214             defaults=defaults,
215             machines=machines,
216             has_vnc=has_vnc,
217             can_clone=can_clone)
218    return d
219
220def listVms(username, state, path, fields):
221    """Handler for list requests."""
222    checkpoint.checkpoint('Getting list dict')
223    d = getListDict(username, state)
224    checkpoint.checkpoint('Got list dict')
225    return templates.list(searchList=[d])
226
227def vnc(username, state, path, fields):
228    """VNC applet page.
229
230    Note that due to same-domain restrictions, the applet connects to
231    the webserver, which needs to forward those requests to the xen
232    server.  The Xen server runs another proxy that (1) authenticates
233    and (2) finds the correct port for the VM.
234
235    You might want iptables like:
236
237    -t nat -A PREROUTING -s ! 18.181.0.60 -i eth1 -p tcp -m tcp \
238      --dport 10003 -j DNAT --to-destination 18.181.0.60:10003
239    -t nat -A POSTROUTING -d 18.181.0.60 -o eth1 -p tcp -m tcp \
240      --dport 10003 -j SNAT --to-source 18.187.7.142
241    -A FORWARD -d 18.181.0.60 -i eth1 -o eth1 -p tcp -m tcp \
242      --dport 10003 -j ACCEPT
243
244    Remember to enable iptables!
245    echo 1 > /proc/sys/net/ipv4/ip_forward
246    """
247    machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine
248
249    token = controls.vnctoken(machine)
250    host = controls.listHost(machine)
251    if host:
252        port = 10003 + [h.hostname for h in config.hosts].index(host)
253    else:
254        port = 5900 # dummy
255
256    status = controls.statusInfo(machine)
257    has_vnc = hasVnc(status)
258
259    d = dict(user=username,
260             on=status,
261             has_vnc=has_vnc,
262             machine=machine,
263             hostname=state.environ.get('SERVER_NAME', 'localhost'),
264             port=port,
265             authtoken=token)
266    return templates.vnc(searchList=[d])
267
268def getHostname(nic):
269    """Find the hostname associated with a NIC.
270
271    XXX this should be merged with the similar logic in DNS and DHCP.
272    """
273    if nic.hostname and '.' in nic.hostname:
274        return nic.hostname
275    elif nic.machine:
276        return nic.machine.name + '.' + config.dns.domains[0]
277    else:
278        return None
279
280
281def getNicInfo(data_dict, machine):
282    """Helper function for info, get data on nics for a machine.
283
284    Modifies data_dict to include the relevant data, and returns a list
285    of (key, name) pairs to display "name: data_dict[key]" to the user.
286    """
287    data_dict['num_nics'] = len(machine.nics)
288    nic_fields_template = [('nic%s_hostname', 'NIC %s Hostname'),
289                           ('nic%s_mac', 'NIC %s MAC Addr'),
290                           ('nic%s_ip', 'NIC %s IP'),
291                           ]
292    nic_fields = []
293    for i in range(len(machine.nics)):
294        nic_fields.extend([(x % i, y % i) for x, y in nic_fields_template])
295        if not i:
296            data_dict['nic%s_hostname' % i] = getHostname(machine.nics[i])
297        data_dict['nic%s_mac' % i] = machine.nics[i].mac_addr
298        data_dict['nic%s_ip' % i] = machine.nics[i].ip
299    if len(machine.nics) == 1:
300        nic_fields = [(x, y.replace('NIC 0 ', '')) for x, y in nic_fields]
301    return nic_fields
302
303def getDiskInfo(data_dict, machine):
304    """Helper function for info, get data on disks for a machine.
305
306    Modifies data_dict to include the relevant data, and returns a list
307    of (key, name) pairs to display "name: data_dict[key]" to the user.
308    """
309    data_dict['num_disks'] = len(machine.disks)
310    disk_fields_template = [('%s_size', '%s size')]
311    disk_fields = []
312    for disk in machine.disks:
313        name = disk.guest_device_name
314        disk_fields.extend([(x % name, y % name) for x, y in
315                            disk_fields_template])
316        data_dict['%s_size' % name] = "%0.1f GiB" % (disk.size / 1024.)
317    return disk_fields
318
319def command(username, state, path, fields):
320    """Handler for running commands like boot and delete on a VM."""
321    back = fields.getfirst('back')
322    try:
323        d = controls.commandResult(username, state, fields)
324        if d['command'] == 'Delete VM':
325            back = 'list'
326    except InvalidInput, err:
327        if not back:
328            raise
329        print >> sys.stderr, err
330        result = err
331    else:
332        result = 'Success!'
333        if not back:
334            return templates.command(searchList=[d])
335    if back == 'list':
336        state.clear() #Changed global state
337        d = getListDict(username, state)
338        d['result'] = result
339        return templates.list(searchList=[d])
340    elif back == 'info':
341        machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine
342        return ({'Status': '303 See Other',
343                 'Location': 'info?machine_id=%d' % machine.machine_id},
344                "You shouldn't see this message.")
345    else:
346        raise InvalidInput('back', back, 'Not a known back page.')
347
348def modifyDict(username, state, fields):
349    """Modify a machine as specified by CGI arguments.
350
351    Return a list of local variables for modify.tmpl.
352    """
353    olddisk = {}
354    session.begin()
355    try:
356        kws = dict([(kw, fields.getfirst(kw)) for kw in 'machine_id owner admin contact name description memory vmtype disksize'.split()])
357        validate = validation.Validate(username, state, **kws)
358        machine = validate.machine
359        oldname = machine.name
360
361        if hasattr(validate, 'memory'):
362            machine.memory = validate.memory
363
364        if hasattr(validate, 'vmtype'):
365            machine.type = validate.vmtype
366
367        if hasattr(validate, 'disksize'):
368            disksize = validate.disksize
369            disk = machine.disks[0]
370            if disk.size != disksize:
371                olddisk[disk.guest_device_name] = disksize
372                disk.size = disksize
373                session.save_or_update(disk)
374
375        update_acl = False
376        if hasattr(validate, 'owner') and validate.owner != machine.owner:
377            machine.owner = validate.owner
378            update_acl = True
379        if hasattr(validate, 'name'):
380            machine.name = validate.name
381        if hasattr(validate, 'description'):
382            machine.description = validate.description
383        if hasattr(validate, 'admin') and validate.admin != machine.administrator:
384            machine.administrator = validate.admin
385            update_acl = True
386        if hasattr(validate, 'contact'):
387            machine.contact = validate.contact
388
389        session.save_or_update(machine)
390        if update_acl:
391            cache_acls.refreshMachine(machine)
392        session.commit()
393    except:
394        session.rollback()
395        raise
396    for diskname in olddisk:
397        controls.resizeDisk(oldname, diskname, str(olddisk[diskname]))
398    if hasattr(validate, 'name'):
399        controls.renameMachine(machine, oldname, validate.name)
400    return dict(user=username,
401                command="modify",
402                machine=machine)
403
404def modify(username, state, path, fields):
405    """Handler for modifying attributes of a machine."""
406    try:
407        modify_dict = modifyDict(username, state, fields)
408    except InvalidInput, err:
409        result = None
410        machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine
411    else:
412        machine = modify_dict['machine']
413        result = 'Success!'
414        err = None
415    info_dict = infoDict(username, state, machine)
416    info_dict['err'] = err
417    if err:
418        for field in fields.keys():
419            setattr(info_dict['defaults'], field, fields.getfirst(field))
420    info_dict['result'] = result
421    return templates.info(searchList=[info_dict])
422
423
424def helpHandler(username, state, path, fields):
425    """Handler for help messages."""
426    simple = fields.getfirst('simple')
427    subjects = fields.getlist('subject')
428
429    help_mapping = {
430                    'Autoinstalls': """
431The autoinstaller builds a minimal Debian or Ubuntu system to run as a
432ParaVM.  You can access the resulting system by logging into the <a
433href="help?simple=true&subject=ParaVM+Console">serial console server</a>
434with your Kerberos tickets; there is no root password and sshd will
435refuse login.</p>
436
437<p>Under the covers the autoinstaller uses our own patched version of
438xen-create-image, which is a tool based on debootstrap.  If you're
439quick in logging into the serial console, you can see it running.
440""",
441                    'ParaVM Console': """
442ParaVM machines do not support local console access over VNC.  To
443access the serial console of these machines, you can SSH with Kerberos
444to %s, using the name of the machine as your
445username.""" % config.console.hostname,
446                    'HVM/ParaVM': """
447HVM machines use the virtualization features of the processor, while
448ParaVM machines use Xen's emulation of virtualization features.  You
449want an HVM virtualized machine.""",
450                    'CPU Weight': """
451Don't ask us!  We're as mystified as you are.""",
452                    'Owner': """
453The owner field is used to determine <a
454href="help?subject=Quotas">quotas</a>.  It must be the name of a
455locker that you are an AFS administrator of.  In particular, you or an
456AFS group you are a member of must have AFS rlidwka bits on the
457locker.  You can check who administers the LOCKER locker using the
458commands 'attach LOCKER; fs la /mit/LOCKER' on Athena.)  See also <a
459href="help?subject=Administrator">administrator</a>.""",
460                    'Administrator': """
461The administrator field determines who can access the console and
462power on and off the machine.  This can be either a user or a moira
463group.""",
464                    'Quotas': """
465Quotas are determined on a per-locker basis.  Each locker may have a
466maximum of 512 megabytes of active ram, 50 gigabytes of disk, and 4
467active machines.""",
468                    'Console': """
469<strong>Framebuffer:</strong> At a Linux boot prompt in your VM, try
470setting <tt>fb=false</tt> to disable the framebuffer.  If you don't,
471your machine will run just fine, but the applet's display of the
472console will suffer artifacts.
473""",
474                    'Windows': """
475<strong>Windows Vista:</strong> The Vista image is licensed for all MIT students and will automatically activate off the network; see <a href="/static/msca-email.txt">the licensing confirmation e-mail</a> for details. The installer req     uires 512 MB RAM and at least 7.5 GB disk space (15 GB or more recommended).<br>
476<strong>Windows XP:</strong> This is the volume license CD image. You will need your own volume license key to complete the install. We do not have these available for the general MIT community; ask your department if they have one.
477"""
478                    }
479
480    if not subjects:
481        subjects = sorted(help_mapping.keys())
482
483    d = dict(user=username,
484             simple=simple,
485             subjects=subjects,
486             mapping=help_mapping)
487
488    return templates.help(searchList=[d])
489
490
491def badOperation(u, s, p, e):
492    """Function called when accessing an unknown URI."""
493    return ({'Status': '404 Not Found'}, 'Invalid operation.')
494
495def infoDict(username, state, machine):
496    """Get the variables used by info.tmpl."""
497    status = controls.statusInfo(machine)
498    checkpoint.checkpoint('Getting status info')
499    has_vnc = hasVnc(status)
500    if status is None:
501        main_status = dict(name=machine.name,
502                           memory=str(machine.memory))
503        uptime = None
504        cputime = None
505    else:
506        main_status = dict(status[1:])
507        main_status['host'] = controls.listHost(machine)
508        start_time = float(main_status.get('start_time', 0))
509        uptime = datetime.timedelta(seconds=int(time.time()-start_time))
510        cpu_time_float = float(main_status.get('cpu_time', 0))
511        cputime = datetime.timedelta(seconds=int(cpu_time_float))
512    checkpoint.checkpoint('Status')
513    display_fields = """name uptime memory state cpu_weight on_reboot
514     on_poweroff on_crash on_xend_start on_xend_stop bootloader""".split()
515    display_fields = [('name', 'Name'),
516                      ('description', 'Description'),
517                      ('owner', 'Owner'),
518                      ('administrator', 'Administrator'),
519                      ('contact', 'Contact'),
520                      ('type', 'Type'),
521                      'NIC_INFO',
522                      ('uptime', 'uptime'),
523                      ('cputime', 'CPU usage'),
524                      ('host', 'Hosted on'),
525                      ('memory', 'RAM'),
526                      'DISK_INFO',
527                      ('state', 'state (xen format)'),
528                      ('cpu_weight', 'CPU weight'+helppopup('CPU Weight')),
529                      ('on_reboot', 'Action on VM reboot'),
530                      ('on_poweroff', 'Action on VM poweroff'),
531                      ('on_crash', 'Action on VM crash'),
532                      ('on_xend_start', 'Action on Xen start'),
533                      ('on_xend_stop', 'Action on Xen stop'),
534                      ('bootloader', 'Bootloader options'),
535                      ]
536    fields = []
537    machine_info = {}
538    machine_info['name'] = machine.name
539    machine_info['description'] = machine.description
540    machine_info['type'] = machine.type.hvm and 'HVM' or 'ParaVM'
541    machine_info['owner'] = machine.owner
542    machine_info['administrator'] = machine.administrator
543    machine_info['contact'] = machine.contact
544
545    nic_fields = getNicInfo(machine_info, machine)
546    nic_point = display_fields.index('NIC_INFO')
547    display_fields = (display_fields[:nic_point] + nic_fields +
548                      display_fields[nic_point+1:])
549
550    disk_fields = getDiskInfo(machine_info, machine)
551    disk_point = display_fields.index('DISK_INFO')
552    display_fields = (display_fields[:disk_point] + disk_fields +
553                      display_fields[disk_point+1:])
554
555    main_status['memory'] += ' MiB'
556    for field, disp in display_fields:
557        if field in ('uptime', 'cputime') and locals()[field] is not None:
558            fields.append((disp, locals()[field]))
559        elif field in machine_info:
560            fields.append((disp, machine_info[field]))
561        elif field in main_status:
562            fields.append((disp, main_status[field]))
563        else:
564            pass
565            #fields.append((disp, None))
566
567    checkpoint.checkpoint('Got fields')
568
569
570    max_mem = validation.maxMemory(machine.owner, state, machine, False)
571    checkpoint.checkpoint('Got mem')
572    max_disk = validation.maxDisk(machine.owner, machine)
573    defaults = Defaults()
574    for name in 'machine_id name description administrator owner memory contact'.split():
575        setattr(defaults, name, getattr(machine, name))
576    defaults.type = machine.type.type_id
577    defaults.disk = "%0.2f" % (machine.disks[0].size/1024.)
578    checkpoint.checkpoint('Got defaults')
579    d = dict(user=username,
580             on=status is not None,
581             machine=machine,
582             defaults=defaults,
583             has_vnc=has_vnc,
584             uptime=str(uptime),
585             ram=machine.memory,
586             max_mem=max_mem,
587             max_disk=max_disk,
588             owner_help=helppopup("Owner"),
589             fields = fields)
590    return d
591
592def info(username, state, path, fields):
593    """Handler for info on a single VM."""
594    machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine
595    d = infoDict(username, state, machine)
596    checkpoint.checkpoint('Got infodict')
597    return templates.info(searchList=[d])
598
599def unauthFront(_, _2, _3, fields):
600    """Information for unauth'd users."""
601    return templates.unauth(searchList=[{'simple' : True}])
602
603def admin(username, state, path, fields):
604    if path == '':
605        return ({'Status': '303 See Other',
606                 'Location': 'admin/'},
607                "You shouldn't see this message.")
608    if not username in getAfsGroupMembers(config.web.adminacl, 'athena.mit.edu'):
609        raise InvalidInput('username', username,
610                           'Not in admin group %s.' % config.web.adminacl)
611    newstate = State(username, isadmin=True)
612    newstate.environ = state.environ
613    return handler(username, newstate, path, fields)
614
615def throwError(_, __, ___, ____):
616    """Throw an error, to test the error-tracing mechanisms."""
617    raise RuntimeError("test of the emergency broadcast system")
618
619mapping = dict(list=listVms,
620               vnc=vnc,
621               command=command,
622               modify=modify,
623               info=info,
624               create=create,
625               help=helpHandler,
626               unauth=unauthFront,
627               admin=admin,
628               overlord=admin,
629               errortest=throwError)
630
631def printHeaders(headers):
632    """Print a dictionary as HTTP headers."""
633    for key, value in headers.iteritems():
634        print '%s: %s' % (key, value)
635    print
636
637def send_error_mail(subject, body):
638    import subprocess
639
640    to = config.web.errormail
641    mail = """To: %s
642From: root@%s
643Subject: %s
644
645%s
646""" % (to, config.web.hostname, subject, body)
647    p = subprocess.Popen(['/usr/sbin/sendmail', to], stdin=subprocess.PIPE)
648    p.stdin.write(mail)
649    p.stdin.close()
650    p.wait()
651
652def show_error(op, username, fields, err, emsg, traceback):
653    """Print an error page when an exception occurs"""
654    d = dict(op=op, user=username, fields=fields,
655             errorMessage=str(err), stderr=emsg, traceback=traceback)
656    details = templates.error_raw(searchList=[d])
657    exclude = config.web.errormail_exclude
658    if username not in exclude and '*' not in exclude:
659        send_error_mail('xvm error on %s for %s: %s' % (op, username, err),
660                        details)
661    d['details'] = details
662    return templates.error(searchList=[d])
663
664def getUser(environ):
665    """Return the current user based on the SSL environment variables"""
666    user = environ.get('REMOTE_USER')
667    if user is None:
668        return
669   
670    if environ.get('AUTH_TYPE') == 'Negotiate':
671        # Convert the krb5 principal into a krb4 username
672        if not user.endswith('@%s' % config.authn[0].realm):
673            return
674        else:
675            return user.split('@')[0].replace('/', '.')
676    else:
677        return user
678
679def handler(username, state, path, fields):
680    operation, path = pathSplit(path)
681    if not operation:
682        operation = 'list'
683    print 'Starting', operation
684    fun = mapping.get(operation, badOperation)
685    return fun(username, state, path, fields)
686
687class App:
688    def __init__(self, environ, start_response):
689        self.environ = environ
690        self.start = start_response
691
692        self.username = getUser(environ)
693        self.state = State(self.username)
694        self.state.environ = environ
695
696        random.seed() #sigh
697
698    def __iter__(self):
699        start_time = time.time()
700        database.clear_cache()
701        sys.stderr = StringIO()
702        fields = cgi.FieldStorage(fp=self.environ['wsgi.input'], environ=self.environ)
703        operation = self.environ.get('PATH_INFO', '')
704        if not operation:
705            self.start("301 Moved Permanently", [('Location', './')])
706            return
707        if self.username is None:
708            operation = 'unauth'
709
710        try:
711            checkpoint.checkpoint('Before')
712            output = handler(self.username, self.state, operation, fields)
713            checkpoint.checkpoint('After')
714
715            headers = dict(DEFAULT_HEADERS)
716            if isinstance(output, tuple):
717                new_headers, output = output
718                headers.update(new_headers)
719            e = revertStandardError()
720            if e:
721                if hasattr(output, 'addError'):
722                    output.addError(e)
723                else:
724                    # This only happens on redirects, so it'd be a pain to get
725                    # the message to the user.  Maybe in the response is useful.
726                    output = output + '\n\nstderr:\n' + e
727            output_string =  str(output)
728            checkpoint.checkpoint('output as a string')
729        except Exception, err:
730            if not fields.has_key('js'):
731                if isinstance(err, InvalidInput):
732                    self.start('200 OK', [('Content-Type', 'text/html')])
733                    e = revertStandardError()
734                    yield str(invalidInput(operation, self.username, fields,
735                                           err, e))
736                    return
737            import traceback
738            self.start('500 Internal Server Error',
739                       [('Content-Type', 'text/html')])
740            e = revertStandardError()
741            s = show_error(operation, self.username, fields,
742                           err, e, traceback.format_exc())
743            yield str(s)
744            return
745        status = headers.setdefault('Status', '200 OK')
746        del headers['Status']
747        self.start(status, headers.items())
748        yield output_string
749        if fields.has_key('timedebug'):
750            yield '<pre>%s</pre>' % cgi.escape(str(checkpoint))
751
752def constructor():
753    connect()
754    return App
755
756def main():
757    from flup.server.fcgi_fork import WSGIServer
758    WSGIServer(constructor()).run()
759
760if __name__ == '__main__':
761    main()
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