1 | #!/usr/bin/python |
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2 | """Main CGI script for web interface""" |
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3 | |
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4 | import base64 |
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5 | import cPickle |
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6 | import cgi |
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7 | import datetime |
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8 | import hmac |
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9 | import sha |
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10 | import simplejson |
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11 | import sys |
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12 | import time |
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13 | import urllib |
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14 | from StringIO import StringIO |
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15 | |
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16 | def revertStandardError(): |
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17 | """Move stderr to stdout, and return the contents of the old stderr.""" |
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18 | errio = sys.stderr |
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19 | if not isinstance(errio, StringIO): |
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20 | return '' |
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21 | sys.stderr = sys.stdout |
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22 | errio.seek(0) |
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23 | return errio.read() |
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24 | |
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25 | def printError(): |
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26 | """Revert stderr to stdout, and print the contents of stderr""" |
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27 | if isinstance(sys.stderr, StringIO): |
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28 | print revertStandardError() |
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29 | |
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30 | if __name__ == '__main__': |
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31 | import atexit |
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32 | atexit.register(printError) |
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33 | |
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34 | sys.path.append('/home/ecprice/.local/lib/python2.5/site-packages') |
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35 | |
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36 | import templates |
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37 | from Cheetah.Template import Template |
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38 | import sipb_xen_database |
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39 | from sipb_xen_database import Machine, CDROM, ctx, connect, MachineAccess, Type, Autoinstall |
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40 | import validation |
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41 | import cache_acls |
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42 | from webcommon import InvalidInput, CodeError, State |
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43 | import controls |
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44 | |
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45 | class Checkpoint: |
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46 | def __init__(self): |
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47 | self.start_time = time.time() |
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48 | self.checkpoints = [] |
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49 | |
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50 | def checkpoint(self, s): |
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51 | self.checkpoints.append((s, time.time())) |
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52 | |
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53 | def __str__(self): |
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54 | return ('Timing info:\n%s\n' % |
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55 | '\n'.join(['%s: %s' % (d, t - self.start_time) for |
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56 | (d, t) in self.checkpoints])) |
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57 | |
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58 | checkpoint = Checkpoint() |
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59 | |
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60 | def jquote(string): |
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61 | return "'" + string.replace('\\', '\\\\').replace("'", "\\'").replace('\n', '\\n') + "'" |
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62 | |
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63 | def helppopup(subj): |
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64 | """Return HTML code for a (?) link to a specified help topic""" |
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65 | return ('<span class="helplink"><a href="help?' + |
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66 | cgi.escape(urllib.urlencode(dict(subject=subj, simple='true'))) |
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67 | +'" target="_blank" ' + |
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68 | 'onclick="return helppopup(' + cgi.escape(jquote(subj)) + ')">(?)</a></span>') |
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69 | |
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70 | def makeErrorPre(old, addition): |
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71 | if addition is None: |
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72 | return |
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73 | if old: |
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74 | return old[:-6] + '\n----\n' + str(addition) + '</pre>' |
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75 | else: |
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76 | return '<p>STDERR:</p><pre>' + str(addition) + '</pre>' |
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77 | |
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78 | Template.sipb_xen_database = sipb_xen_database |
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79 | Template.helppopup = staticmethod(helppopup) |
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80 | Template.err = None |
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81 | |
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82 | class JsonDict: |
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83 | """Class to store a dictionary that will be converted to JSON""" |
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84 | def __init__(self, **kws): |
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85 | self.data = kws |
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86 | if 'err' in kws: |
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87 | err = kws['err'] |
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88 | del kws['err'] |
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89 | self.addError(err) |
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90 | |
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91 | def __str__(self): |
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92 | return simplejson.dumps(self.data) |
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93 | |
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94 | def addError(self, text): |
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95 | """Add stderr text to be displayed on the website.""" |
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96 | self.data['err'] = \ |
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97 | makeErrorPre(self.data.get('err'), text) |
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98 | |
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99 | class Defaults: |
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100 | """Class to store default values for fields.""" |
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101 | memory = 256 |
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102 | disk = 4.0 |
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103 | cdrom = '' |
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104 | autoinstall = '' |
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105 | name = '' |
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106 | type = 'linux-hvm' |
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107 | |
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108 | def __init__(self, max_memory=None, max_disk=None, **kws): |
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109 | if max_memory is not None: |
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110 | self.memory = min(self.memory, max_memory) |
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111 | if max_disk is not None: |
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112 | self.max_disk = min(self.disk, max_disk) |
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113 | for key in kws: |
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114 | setattr(self, key, kws[key]) |
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115 | |
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116 | |
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117 | |
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118 | DEFAULT_HEADERS = {'Content-Type': 'text/html'} |
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119 | |
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120 | def error(op, username, fields, err, emsg, traceback): |
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121 | """Print an error page when a CodeError occurs""" |
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122 | send_error_mail('xvm error on %s for %s: %s' % (op, username, err), |
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123 | 'error on %s for %s: %s\n\n%s\n' |
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124 | % (op, username, err, emsg)) |
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125 | d = dict(op=op, user=username, fields=fields, |
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126 | errorMessage=str(err), stderr=emsg, traceback=traceback) |
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127 | return templates.error(searchList=[d]) |
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128 | |
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129 | def invalidInput(op, username, fields, err, emsg): |
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130 | """Print an error page when an InvalidInput exception occurs""" |
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131 | d = dict(op=op, user=username, err_field=err.err_field, |
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132 | err_value=str(err.err_value), stderr=emsg, |
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133 | errorMessage=str(err)) |
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134 | return templates.invalid(searchList=[d]) |
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135 | |
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136 | def hasVnc(status): |
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137 | """Does the machine with a given status list support VNC?""" |
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138 | if status is None: |
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139 | return False |
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140 | for l in status: |
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141 | if l[0] == 'device' and l[1][0] == 'vfb': |
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142 | d = dict(l[1][1:]) |
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143 | return 'location' in d |
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144 | return False |
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145 | |
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146 | def parseCreate(username, state, fields): |
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147 | kws = dict([(kw, fields.getfirst(kw)) for kw in 'name owner memory disksize vmtype cdrom clone_from'.split()]) |
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148 | validate = validation.Validate(username, state, strict=True, **kws) |
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149 | return dict(contact=username, name=validate.name, memory=validate.memory, |
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150 | disksize=validate.disksize, owner=validate.owner, machine_type=validate.vmtype, |
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151 | cdrom=getattr(validate, 'cdrom', None), |
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152 | clone_from=getattr(validate, 'clone_from', None)) |
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153 | |
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154 | def create(username, state, fields): |
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155 | """Handler for create requests.""" |
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156 | try: |
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157 | parsed_fields = parseCreate(username, state, fields) |
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158 | machine = controls.createVm(username, state, **parsed_fields) |
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159 | except InvalidInput, err: |
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160 | pass |
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161 | else: |
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162 | err = None |
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163 | state.clear() #Changed global state |
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164 | d = getListDict(username, state) |
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165 | d['err'] = err |
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166 | if err: |
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167 | for field in fields.keys(): |
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168 | setattr(d['defaults'], field, fields.getfirst(field)) |
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169 | else: |
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170 | d['new_machine'] = parsed_fields['name'] |
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171 | return templates.list(searchList=[d]) |
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172 | |
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173 | |
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174 | def getListDict(username, state): |
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175 | """Gets the list of local variables used by list.tmpl.""" |
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176 | checkpoint.checkpoint('Starting') |
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177 | machines = state.machines |
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178 | checkpoint.checkpoint('Got my machines') |
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179 | on = {} |
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180 | has_vnc = {} |
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181 | xmlist = state.xmlist |
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182 | checkpoint.checkpoint('Got uptimes') |
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183 | can_clone = 'ice3' not in state.xmlist_raw |
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184 | for m in machines: |
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185 | if m not in xmlist: |
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186 | has_vnc[m] = 'Off' |
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187 | m.uptime = None |
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188 | else: |
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189 | m.uptime = xmlist[m]['uptime'] |
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190 | if xmlist[m]['console']: |
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191 | has_vnc[m] = True |
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192 | elif m.type.hvm: |
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193 | has_vnc[m] = "WTF?" |
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194 | else: |
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195 | has_vnc[m] = "ParaVM"+helppopup("ParaVM Console") |
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196 | max_memory = validation.maxMemory(username, state) |
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197 | max_disk = validation.maxDisk(username) |
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198 | checkpoint.checkpoint('Got max mem/disk') |
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199 | defaults = Defaults(max_memory=max_memory, |
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200 | max_disk=max_disk, |
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201 | owner=username, |
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202 | cdrom='gutsy-i386') |
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203 | checkpoint.checkpoint('Got defaults') |
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204 | def sortkey(machine): |
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205 | return (machine.owner != username, machine.owner, machine.name) |
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206 | machines = sorted(machines, key=sortkey) |
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207 | d = dict(user=username, |
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208 | cant_add_vm=validation.cantAddVm(username, state), |
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209 | max_memory=max_memory, |
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210 | max_disk=max_disk, |
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211 | defaults=defaults, |
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212 | machines=machines, |
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213 | has_vnc=has_vnc, |
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214 | can_clone=can_clone) |
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215 | return d |
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216 | |
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217 | def listVms(username, state, fields): |
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218 | """Handler for list requests.""" |
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219 | checkpoint.checkpoint('Getting list dict') |
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220 | d = getListDict(username, state) |
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221 | checkpoint.checkpoint('Got list dict') |
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222 | return templates.list(searchList=[d]) |
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223 | |
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224 | def vnc(username, state, fields): |
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225 | """VNC applet page. |
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226 | |
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227 | Note that due to same-domain restrictions, the applet connects to |
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228 | the webserver, which needs to forward those requests to the xen |
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229 | server. The Xen server runs another proxy that (1) authenticates |
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230 | and (2) finds the correct port for the VM. |
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231 | |
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232 | You might want iptables like: |
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233 | |
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234 | -t nat -A PREROUTING -s ! 18.181.0.60 -i eth1 -p tcp -m tcp \ |
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235 | --dport 10003 -j DNAT --to-destination 18.181.0.60:10003 |
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236 | -t nat -A POSTROUTING -d 18.181.0.60 -o eth1 -p tcp -m tcp \ |
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237 | --dport 10003 -j SNAT --to-source 18.187.7.142 |
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238 | -A FORWARD -d 18.181.0.60 -i eth1 -o eth1 -p tcp -m tcp \ |
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239 | --dport 10003 -j ACCEPT |
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240 | |
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241 | Remember to enable iptables! |
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242 | echo 1 > /proc/sys/net/ipv4/ip_forward |
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243 | """ |
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244 | machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine |
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245 | |
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246 | TOKEN_KEY = "0M6W0U1IXexThi5idy8mnkqPKEq1LtEnlK/pZSn0cDrN" |
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247 | |
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248 | data = {} |
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249 | data["user"] = username |
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250 | data["machine"] = machine.name |
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251 | data["expires"] = time.time()+(5*60) |
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252 | pickled_data = cPickle.dumps(data) |
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253 | m = hmac.new(TOKEN_KEY, digestmod=sha) |
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254 | m.update(pickled_data) |
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255 | token = {'data': pickled_data, 'digest': m.digest()} |
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256 | token = cPickle.dumps(token) |
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257 | token = base64.urlsafe_b64encode(token) |
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258 | |
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259 | status = controls.statusInfo(machine) |
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260 | has_vnc = hasVnc(status) |
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261 | |
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262 | d = dict(user=username, |
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263 | on=status, |
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264 | has_vnc=has_vnc, |
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265 | machine=machine, |
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266 | hostname=state.environ.get('SERVER_NAME', 'localhost'), |
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267 | authtoken=token) |
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268 | return templates.vnc(searchList=[d]) |
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269 | |
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270 | def getHostname(nic): |
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271 | """Find the hostname associated with a NIC. |
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272 | |
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273 | XXX this should be merged with the similar logic in DNS and DHCP. |
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274 | """ |
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275 | if nic.hostname and '.' in nic.hostname: |
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276 | return nic.hostname |
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277 | elif nic.machine: |
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278 | return nic.machine.name + '.xvm.mit.edu' |
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279 | else: |
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280 | return None |
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281 | |
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282 | |
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283 | def getNicInfo(data_dict, machine): |
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284 | """Helper function for info, get data on nics for a machine. |
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285 | |
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286 | Modifies data_dict to include the relevant data, and returns a list |
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287 | of (key, name) pairs to display "name: data_dict[key]" to the user. |
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288 | """ |
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289 | data_dict['num_nics'] = len(machine.nics) |
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290 | nic_fields_template = [('nic%s_hostname', 'NIC %s Hostname'), |
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291 | ('nic%s_mac', 'NIC %s MAC Addr'), |
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292 | ('nic%s_ip', 'NIC %s IP'), |
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293 | ] |
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294 | nic_fields = [] |
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295 | for i in range(len(machine.nics)): |
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296 | nic_fields.extend([(x % i, y % i) for x, y in nic_fields_template]) |
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297 | if not i: |
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298 | data_dict['nic%s_hostname' % i] = getHostname(machine.nics[i]) |
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299 | data_dict['nic%s_mac' % i] = machine.nics[i].mac_addr |
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300 | data_dict['nic%s_ip' % i] = machine.nics[i].ip |
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301 | if len(machine.nics) == 1: |
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302 | nic_fields = [(x, y.replace('NIC 0 ', '')) for x, y in nic_fields] |
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303 | return nic_fields |
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304 | |
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305 | def getDiskInfo(data_dict, machine): |
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306 | """Helper function for info, get data on disks for a machine. |
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307 | |
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308 | Modifies data_dict to include the relevant data, and returns a list |
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309 | of (key, name) pairs to display "name: data_dict[key]" to the user. |
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310 | """ |
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311 | data_dict['num_disks'] = len(machine.disks) |
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312 | disk_fields_template = [('%s_size', '%s size')] |
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313 | disk_fields = [] |
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314 | for disk in machine.disks: |
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315 | name = disk.guest_device_name |
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316 | disk_fields.extend([(x % name, y % name) for x, y in |
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317 | disk_fields_template]) |
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318 | data_dict['%s_size' % name] = "%0.1f GiB" % (disk.size / 1024.) |
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319 | return disk_fields |
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320 | |
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321 | def command(username, state, fields): |
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322 | """Handler for running commands like boot and delete on a VM.""" |
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323 | back = fields.getfirst('back') |
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324 | try: |
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325 | d = controls.commandResult(username, state, fields) |
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326 | if d['command'] == 'Delete VM': |
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327 | back = 'list' |
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328 | except InvalidInput, err: |
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329 | if not back: |
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330 | raise |
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331 | print >> sys.stderr, err |
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332 | result = err |
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333 | else: |
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334 | result = 'Success!' |
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335 | if not back: |
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336 | return templates.command(searchList=[d]) |
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337 | if back == 'list': |
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338 | state.clear() #Changed global state |
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339 | d = getListDict(username, state) |
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340 | d['result'] = result |
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341 | return templates.list(searchList=[d]) |
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342 | elif back == 'info': |
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343 | machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine |
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344 | return ({'Status': '303 See Other', |
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345 | 'Location': '/info?machine_id=%d' % machine.machine_id}, |
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346 | "You shouldn't see this message.") |
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347 | else: |
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348 | raise InvalidInput('back', back, 'Not a known back page.') |
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349 | |
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350 | def modifyDict(username, state, fields): |
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351 | """Modify a machine as specified by CGI arguments. |
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352 | |
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353 | Return a list of local variables for modify.tmpl. |
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354 | """ |
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355 | olddisk = {} |
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356 | transaction = ctx.current.create_transaction() |
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357 | try: |
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358 | kws = dict([(kw, fields.getfirst(kw)) for kw in 'machine_id owner admin contact name memory vmtype disksize'.split()]) |
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359 | validate = validation.Validate(username, state, **kws) |
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360 | machine = validate.machine |
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361 | oldname = machine.name |
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362 | |
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363 | if hasattr(validate, 'memory'): |
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364 | machine.memory = validate.memory |
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365 | |
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366 | if hasattr(validate, 'vmtype'): |
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367 | machine.type = validate.vmtype |
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368 | |
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369 | if hasattr(validate, 'disksize'): |
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370 | disksize = validate.disksize |
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371 | disk = machine.disks[0] |
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372 | if disk.size != disksize: |
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373 | olddisk[disk.guest_device_name] = disksize |
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374 | disk.size = disksize |
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375 | ctx.current.save(disk) |
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376 | |
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377 | update_acl = False |
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378 | if hasattr(validate, 'owner') and validate.owner != machine.owner: |
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379 | machine.owner = validate.owner |
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380 | update_acl = True |
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381 | if hasattr(validate, 'name'): |
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382 | machine.name = validate.name |
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383 | if hasattr(validate, 'admin') and validate.admin != machine.administrator: |
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384 | machine.administrator = validate.admin |
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385 | update_acl = True |
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386 | if hasattr(validate, 'contact'): |
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387 | machine.contact = validate.contact |
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388 | |
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389 | ctx.current.save(machine) |
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390 | if update_acl: |
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391 | print >> sys.stderr, machine, machine.administrator |
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392 | cache_acls.refreshMachine(machine) |
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393 | transaction.commit() |
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394 | except: |
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395 | transaction.rollback() |
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396 | raise |
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397 | for diskname in olddisk: |
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398 | controls.resizeDisk(oldname, diskname, str(olddisk[diskname])) |
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399 | if hasattr(validate, 'name'): |
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400 | controls.renameMachine(machine, oldname, validate.name) |
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401 | return dict(user=username, |
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402 | command="modify", |
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403 | machine=machine) |
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404 | |
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405 | def modify(username, state, fields): |
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406 | """Handler for modifying attributes of a machine.""" |
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407 | try: |
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408 | modify_dict = modifyDict(username, state, fields) |
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409 | except InvalidInput, err: |
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410 | result = None |
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411 | machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine |
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412 | else: |
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413 | machine = modify_dict['machine'] |
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414 | result = 'Success!' |
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415 | err = None |
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416 | info_dict = infoDict(username, state, machine) |
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417 | info_dict['err'] = err |
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418 | if err: |
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419 | for field in fields.keys(): |
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420 | setattr(info_dict['defaults'], field, fields.getfirst(field)) |
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421 | info_dict['result'] = result |
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422 | return templates.info(searchList=[info_dict]) |
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423 | |
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424 | |
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425 | def helpHandler(username, state, fields): |
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426 | """Handler for help messages.""" |
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427 | simple = fields.getfirst('simple') |
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428 | subjects = fields.getlist('subject') |
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429 | |
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430 | help_mapping = {'ParaVM Console': """ |
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431 | ParaVM machines do not support local console access over VNC. To |
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432 | access the serial console of these machines, you can SSH with Kerberos |
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433 | to console.xvm.mit.edu, using the name of the machine as your |
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434 | username.""", |
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435 | 'HVM/ParaVM': """ |
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436 | HVM machines use the virtualization features of the processor, while |
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437 | ParaVM machines use Xen's emulation of virtualization features. You |
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438 | want an HVM virtualized machine.""", |
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439 | 'CPU Weight': """ |
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440 | Don't ask us! We're as mystified as you are.""", |
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441 | 'Owner': """ |
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442 | The owner field is used to determine <a |
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443 | href="help?subject=Quotas">quotas</a>. It must be the name of a |
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444 | locker that you are an AFS administrator of. In particular, you or an |
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445 | AFS group you are a member of must have AFS rlidwka bits on the |
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446 | locker. You can check who administers the LOCKER locker using the |
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447 | commands 'attach LOCKER; fs la /mit/LOCKER' on Athena.) See also <a |
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448 | href="help?subject=Administrator">administrator</a>.""", |
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449 | 'Administrator': """ |
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450 | The administrator field determines who can access the console and |
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451 | power on and off the machine. This can be either a user or a moira |
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452 | group.""", |
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453 | 'Quotas': """ |
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454 | Quotas are determined on a per-locker basis. Each locker may have a |
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455 | maximum of 512 megabytes of active ram, 50 gigabytes of disk, and 4 |
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456 | active machines.""", |
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457 | 'Console': """ |
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458 | <strong>Framebuffer:</strong> At a Linux boot prompt in your VM, try |
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459 | setting <tt>fb=false</tt> to disable the framebuffer. If you don't, |
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460 | your machine will run just fine, but the applet's display of the |
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461 | console will suffer artifacts. |
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462 | """ |
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463 | } |
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464 | |
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465 | if not subjects: |
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466 | subjects = sorted(help_mapping.keys()) |
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467 | |
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468 | d = dict(user=username, |
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469 | simple=simple, |
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470 | subjects=subjects, |
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471 | mapping=help_mapping) |
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472 | |
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473 | return templates.help(searchList=[d]) |
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474 | |
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475 | |
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476 | def badOperation(u, s, e): |
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477 | """Function called when accessing an unknown URI.""" |
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478 | raise CodeError("Unknown operation") |
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479 | |
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480 | def infoDict(username, state, machine): |
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481 | """Get the variables used by info.tmpl.""" |
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482 | status = controls.statusInfo(machine) |
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483 | checkpoint.checkpoint('Getting status info') |
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484 | has_vnc = hasVnc(status) |
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485 | if status is None: |
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486 | main_status = dict(name=machine.name, |
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487 | memory=str(machine.memory)) |
---|
488 | uptime = None |
---|
489 | cputime = None |
---|
490 | else: |
---|
491 | main_status = dict(status[1:]) |
---|
492 | start_time = float(main_status.get('start_time', 0)) |
---|
493 | uptime = datetime.timedelta(seconds=int(time.time()-start_time)) |
---|
494 | cpu_time_float = float(main_status.get('cpu_time', 0)) |
---|
495 | cputime = datetime.timedelta(seconds=int(cpu_time_float)) |
---|
496 | checkpoint.checkpoint('Status') |
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497 | display_fields = """name uptime memory state cpu_weight on_reboot |
---|
498 | on_poweroff on_crash on_xend_start on_xend_stop bootloader""".split() |
---|
499 | display_fields = [('name', 'Name'), |
---|
500 | ('owner', 'Owner'), |
---|
501 | ('administrator', 'Administrator'), |
---|
502 | ('contact', 'Contact'), |
---|
503 | ('type', 'Type'), |
---|
504 | 'NIC_INFO', |
---|
505 | ('uptime', 'uptime'), |
---|
506 | ('cputime', 'CPU usage'), |
---|
507 | ('memory', 'RAM'), |
---|
508 | 'DISK_INFO', |
---|
509 | ('state', 'state (xen format)'), |
---|
510 | ('cpu_weight', 'CPU weight'+helppopup('CPU Weight')), |
---|
511 | ('on_reboot', 'Action on VM reboot'), |
---|
512 | ('on_poweroff', 'Action on VM poweroff'), |
---|
513 | ('on_crash', 'Action on VM crash'), |
---|
514 | ('on_xend_start', 'Action on Xen start'), |
---|
515 | ('on_xend_stop', 'Action on Xen stop'), |
---|
516 | ('bootloader', 'Bootloader options'), |
---|
517 | ] |
---|
518 | fields = [] |
---|
519 | machine_info = {} |
---|
520 | machine_info['name'] = machine.name |
---|
521 | machine_info['type'] = machine.type.hvm and 'HVM' or 'ParaVM' |
---|
522 | machine_info['owner'] = machine.owner |
---|
523 | machine_info['administrator'] = machine.administrator |
---|
524 | machine_info['contact'] = machine.contact |
---|
525 | |
---|
526 | nic_fields = getNicInfo(machine_info, machine) |
---|
527 | nic_point = display_fields.index('NIC_INFO') |
---|
528 | display_fields = (display_fields[:nic_point] + nic_fields + |
---|
529 | display_fields[nic_point+1:]) |
---|
530 | |
---|
531 | disk_fields = getDiskInfo(machine_info, machine) |
---|
532 | disk_point = display_fields.index('DISK_INFO') |
---|
533 | display_fields = (display_fields[:disk_point] + disk_fields + |
---|
534 | display_fields[disk_point+1:]) |
---|
535 | |
---|
536 | main_status['memory'] += ' MiB' |
---|
537 | for field, disp in display_fields: |
---|
538 | if field in ('uptime', 'cputime') and locals()[field] is not None: |
---|
539 | fields.append((disp, locals()[field])) |
---|
540 | elif field in machine_info: |
---|
541 | fields.append((disp, machine_info[field])) |
---|
542 | elif field in main_status: |
---|
543 | fields.append((disp, main_status[field])) |
---|
544 | else: |
---|
545 | pass |
---|
546 | #fields.append((disp, None)) |
---|
547 | |
---|
548 | checkpoint.checkpoint('Got fields') |
---|
549 | |
---|
550 | |
---|
551 | max_mem = validation.maxMemory(machine.owner, state, machine, False) |
---|
552 | checkpoint.checkpoint('Got mem') |
---|
553 | max_disk = validation.maxDisk(machine.owner, machine) |
---|
554 | defaults = Defaults() |
---|
555 | for name in 'machine_id name administrator owner memory contact'.split(): |
---|
556 | setattr(defaults, name, getattr(machine, name)) |
---|
557 | defaults.type = machine.type.type_id |
---|
558 | defaults.disk = "%0.2f" % (machine.disks[0].size/1024.) |
---|
559 | checkpoint.checkpoint('Got defaults') |
---|
560 | d = dict(user=username, |
---|
561 | on=status is not None, |
---|
562 | machine=machine, |
---|
563 | defaults=defaults, |
---|
564 | has_vnc=has_vnc, |
---|
565 | uptime=str(uptime), |
---|
566 | ram=machine.memory, |
---|
567 | max_mem=max_mem, |
---|
568 | max_disk=max_disk, |
---|
569 | owner_help=helppopup("Owner"), |
---|
570 | fields = fields) |
---|
571 | return d |
---|
572 | |
---|
573 | def info(username, state, fields): |
---|
574 | """Handler for info on a single VM.""" |
---|
575 | machine = validation.Validate(username, state, machine_id=fields.getfirst('machine_id')).machine |
---|
576 | d = infoDict(username, state, machine) |
---|
577 | checkpoint.checkpoint('Got infodict') |
---|
578 | return templates.info(searchList=[d]) |
---|
579 | |
---|
580 | def unauthFront(_, _2, fields): |
---|
581 | """Information for unauth'd users.""" |
---|
582 | return templates.unauth(searchList=[{'simple' : True}]) |
---|
583 | |
---|
584 | def throwError(_, __, ___): |
---|
585 | """Throw an error, to test the error-tracing mechanisms.""" |
---|
586 | raise CodeError("test of the emergency broadcast system") |
---|
587 | |
---|
588 | mapping = dict(list=listVms, |
---|
589 | vnc=vnc, |
---|
590 | command=command, |
---|
591 | modify=modify, |
---|
592 | info=info, |
---|
593 | create=create, |
---|
594 | help=helpHandler, |
---|
595 | unauth=unauthFront, |
---|
596 | errortest=throwError) |
---|
597 | |
---|
598 | def printHeaders(headers): |
---|
599 | """Print a dictionary as HTTP headers.""" |
---|
600 | for key, value in headers.iteritems(): |
---|
601 | print '%s: %s' % (key, value) |
---|
602 | print |
---|
603 | |
---|
604 | def send_error_mail(subject, body): |
---|
605 | import subprocess |
---|
606 | |
---|
607 | to = 'xvm@mit.edu' |
---|
608 | mail = """To: %s |
---|
609 | From: root@xvm.mit.edu |
---|
610 | Subject: %s |
---|
611 | |
---|
612 | %s |
---|
613 | """ % (to, subject, body) |
---|
614 | p = subprocess.Popen(['/usr/sbin/sendmail', to], stdin=subprocess.PIPE) |
---|
615 | p.stdin.write(mail) |
---|
616 | p.stdin.close() |
---|
617 | p.wait() |
---|
618 | |
---|
619 | def getUser(environ): |
---|
620 | """Return the current user based on the SSL environment variables""" |
---|
621 | email = environ.get('SSL_CLIENT_S_DN_Email', None) |
---|
622 | if email is None: |
---|
623 | return None |
---|
624 | if not email.endswith('@MIT.EDU'): |
---|
625 | return None |
---|
626 | return email[:-8] |
---|
627 | |
---|
628 | class App: |
---|
629 | def __init__(self, environ, start_response): |
---|
630 | self.environ = environ |
---|
631 | self.start = start_response |
---|
632 | |
---|
633 | self.username = getUser(environ) |
---|
634 | self.state = State(self.username) |
---|
635 | self.state.environ = environ |
---|
636 | |
---|
637 | def __iter__(self): |
---|
638 | sys.stderr = StringIO() |
---|
639 | fields = cgi.FieldStorage(fp=self.environ['wsgi.input'], environ=self.environ) |
---|
640 | operation = self.environ.get('PATH_INFO', '') |
---|
641 | if not operation: |
---|
642 | self.start("301 Moved Permanently", [('Location', |
---|
643 | self.environ['SCRIPT_NAME']+'/')]) |
---|
644 | return |
---|
645 | if self.username is None: |
---|
646 | operation = 'unauth' |
---|
647 | if operation.startswith('/'): |
---|
648 | operation = operation[1:] |
---|
649 | if not operation: |
---|
650 | operation = 'list' |
---|
651 | print 'Starting', operation |
---|
652 | |
---|
653 | start_time = time.time() |
---|
654 | fun = mapping.get(operation, badOperation) |
---|
655 | try: |
---|
656 | checkpoint.checkpoint('Before') |
---|
657 | output = fun(self.username, self.state, fields) |
---|
658 | checkpoint.checkpoint('After') |
---|
659 | |
---|
660 | headers = dict(DEFAULT_HEADERS) |
---|
661 | if isinstance(output, tuple): |
---|
662 | new_headers, output = output |
---|
663 | headers.update(new_headers) |
---|
664 | print 'MOO2' |
---|
665 | e = revertStandardError() |
---|
666 | if e: |
---|
667 | if isinstance(output, basestring): |
---|
668 | sys.stderr = StringIO() |
---|
669 | x = str(output) |
---|
670 | print >> sys.stderr, x |
---|
671 | print >> sys.stderr, 'XXX' |
---|
672 | print >> sys.stderr, e |
---|
673 | raise Exception() |
---|
674 | output.addError(e) |
---|
675 | output_string = str(output) |
---|
676 | checkpoint.checkpoint('output as a string') |
---|
677 | except Exception, err: |
---|
678 | import traceback |
---|
679 | if not fields.has_key('js'): |
---|
680 | if isinstance(err, CodeError): |
---|
681 | self.start('500 Internal Server Error', [('Content-Type', 'text/html')]) |
---|
682 | e = revertStandardError() |
---|
683 | s = error(operation, self.username, fields, |
---|
684 | err, e, traceback.format_exc()) |
---|
685 | yield str(s) |
---|
686 | return |
---|
687 | if isinstance(err, InvalidInput): |
---|
688 | self.start('200 OK', [('Content-Type', 'text/html')]) |
---|
689 | e = revertStandardError() |
---|
690 | yield str(invalidInput(operation, self.username, fields, err, e)) |
---|
691 | return |
---|
692 | self.start('500 Internal Server Error', [('Content-Type', 'text/plain')]) |
---|
693 | send_error_mail('xvm error: %s' % (err,), |
---|
694 | '%s\n' % (traceback.format_exc(),)) |
---|
695 | yield '''Uh-oh! We experienced an error. |
---|
696 | Sorry about that. We've gotten mail about it. |
---|
697 | |
---|
698 | Feel free to poke us at xvm@mit.edu if this bug is |
---|
699 | consistently biting you and we don't seem to be fixing it. |
---|
700 | |
---|
701 | In case you're curious, the gory details are here. |
---|
702 | ---- |
---|
703 | %s |
---|
704 | ---- |
---|
705 | %s |
---|
706 | ----''' % (str(err), traceback.format_exc()) |
---|
707 | status = headers.setdefault('Status', '200 OK') |
---|
708 | del headers['Status'] |
---|
709 | self.start(status, headers.items()) |
---|
710 | yield output_string |
---|
711 | if fields.has_key('timedebug'): |
---|
712 | yield '<pre>%s</pre>' % cgi.escape(str(checkpoint)) |
---|
713 | |
---|
714 | def constructor(): |
---|
715 | connect('postgres://sipb-xen@sipb-xen-dev.mit.edu/sipb_xen') |
---|
716 | return App |
---|
717 | |
---|
718 | def main(): |
---|
719 | from flup.server.fcgi_fork import WSGIServer |
---|
720 | WSGIServer(constructor()).run() |
---|
721 | |
---|
722 | if __name__ == '__main__': |
---|
723 | main() |
---|