RunlevelAgent.py

   1 #!/usr/bin/python
   2
   3 import xml, xmlrpclib
   4 import logging
   5 import time
   6 import traceback
   7 import sys
   8 import os
   9 import string
  10
  11 CONFIG_FILE="/tmp/source/configuration"
  12 SESSION_FILE="/etc/planetlab/session"
  13
  14 def read_config_file(filename):
  15     ## NOTE: text copied from BootManager.py
  16     # TODO: unify this code to make it common. i.e. use ConfigParser module
  17     vars = {}
  18     vars_file= file(filename,'r')
  19     validConfFile = True
  20     for line in vars_file:
  21         # if its a comment or a whitespace line, ignore
  22         if line[:1] == "#" or string.strip(line) == "":
  23             continue
  24
  25         parts= string.split(line,"=")
  26         if len(parts) != 2:
  27             print "Invalid line in vars file: %s" % line
  28             validConfFile = False
  29             break
  30
  31         name= string.strip(parts[0])
  32         value= string.strip(parts[1])
  33         vars[name]= value
  34
  35     vars_file.close()
  36     if not validConfFile:
  37         print "Unable to read configuration vars."
  38
  39     return vars
  40
  41 try:
  42     sys.path = ['/etc/planetlab'] + sys.path
  43     import plc_config
  44     api_server_url = "https://" + plc_config.PLC_API_HOST + plc_config.PLC_API_PATH
  45 except:
  46     filename=CONFIG_FILE
  47     vars = read_config_file(filename)
  48     api_server_url = vars['BOOT_API_SERVER']
  49
  50
  51 class Auth:
  52     def __init__(self, username=None, password=None, **kwargs):
  53         if 'session' in kwargs:
  54             self.auth= { 'AuthMethod' : 'session',
  55                     'session' : kwargs['session'] }
  56         else:
  57             if username==None and password==None:
  58                 self.auth = {'AuthMethod': "anonymous"}
  59             else:
  60                 self.auth = {'Username' : username,
  61                             'AuthMethod' : 'password',
  62                             'AuthString' : password}
  63 class PLC:
  64     def __init__(self, auth, url):
  65         self.auth = auth
  66         self.url = url
  67         self.api = xmlrpclib.Server(self.url, verbose=False, allow_none=True)
  68
  69     def __getattr__(self, name):
  70         method = getattr(self.api, name)
  71         if method is None:
  72             raise AssertionError("method does not exist")
  73
  74         return lambda *params : method(self.auth.auth, *params)
  75
  76     def __repr__(self):
  77         return self.api.__repr__()
  78
  79 def extract_from(filename, pattern):
  80         f = os.popen("grep -E %s %s" % (pattern, filename))
  81         val = f.read().strip()
  82         return val
  83
  84 def check_running(commandname):
  85         f = os.popen("ps ax | grep -E %s | grep -v grep" % (commandname))
  86         val = f.read().strip()
  87         return val
  88
  89
  90 def main():
  91
  92     f=open(SESSION_FILE,'r')
  93     session_str=f.read().strip()
  94     api = PLC(Auth(session=session_str), api_server_url)
  95         # NOTE: What should we do if this call fails?
  96     api.AuthCheck()
  97
  98     try:
  99         env = 'production'
 100         if len(sys.argv) > 1:
 101             env = sys.argv[1]
 102     except:
 103         traceback.print_exc()
 104
 105     while True:
 106         #print "reporting status: ", os.popen("uptime").read().strip()
 107         try:
 108             # NOTE: here we are inferring the runlevel by environmental
 109                         #               observations.  We know how this process was started by the
 110                         #               given command line argument.  Then in bootmanager
 111                         #               runlevle, the bm.log gives information about the current
 112                         #               activity.
 113                         # other options:
 114                         #   call plc for current boot state?
 115                         #   how long have we been running?
 116             if env == "bootmanager":
 117                                 bs_val = extract_from('/tmp/bm.log', 'Current boot state:').split()[3]
 118                                 ex_val = extract_from('/tmp/bm.log', 'Exception')
 119                                 fs_val = extract_from('/tmp/bm.log', 'mke2fs')
 120                                 bm_val = check_running("BootManager.py")
 121
 122                                 if bs_val in ['diag', 'diagnose', 'safeboot', 'disabled', 'disable']:
 123                         api.ReportRunlevel({'run_level' : 'safeboot'})
 124
 125                                 elif len(ex_val) > len("Exception"):
 126                         api.ReportRunlevel({'run_level' : 'failboot'})
 127
 128                                 elif len(fs_val) > 0 and len(bm_val) > 0:
 129                         api.ReportRunlevel({'run_level' : 'reinstall'})
 130
 131                                 else:
 132                         api.ReportRunlevel({'run_level' : 'failboot'})
 133
 134             elif env == "production":
 135                 api.ReportRunlevel({'run_level' : 'boot'})
 136             else:
 137                 api.ReportRunlevel({'run_level' : 'failboot'})
 138
 139         except:
 140             traceback.print_exc()
 141
 142         # TODO: change to a configurable value
 143         sys.stdout.flush()
 144         time.sleep(60*15)
 145
 146 if __name__ == "__main__":
 147     main()