#!/usr/bin/python2.4

from OpenSSL import SSL
from OpenSSL import crypto
import certgen
import sys, os, socket, getopt, commands, time
#import fcntl, select
import logging, syslog
from SecureXMLRPCClient import SecureXMLRPCClient
import xmlrpclib
import traceback
from pprint import pprint

bind_address = "localhost"
bind_port = 9876
config_dir = "/etc/scire"
sim = False
debug = True
verbose = False
daemon = False
poll_int = 10

# MATT: When job is received, store it in a spool directory (as XML?)
# 	Implemented in scired.py (stub).

# MATT: When the client starts up, it needs to read in any jobs from 
#        the spool. (Potential for indexing here?)
#	Implemented in scired.py (stub).

# MATT: When the job is finished executing, remove it from the spool.
#	Implemented in scired.py (stub).

# MATT: Populate some kind of summary vector to send to the server so 
#       the server won't resend jobs. The vector should consist of 
# 	hashes.

# MATT: What is necessary to make these actions atomic? Is that even
#	possible?

def display_traceback():
        etype, value, tb = sys.exc_info()
        s = traceback.format_exception(etype, value, tb)
        for line in s:
                print line.strip()

def run_jobs(client,jobs):
	# The rcodes dict will contain the results for the
	# execution of each job. It will be returned in its
	# entirety.
	# 0 = Successful
	# 1 = Job execution failed
	# 2 = Sanity check failed
	
	for jobid in jobs:
		job=client.get_job(jobid,True)

		if sim or debug or verbose:
			print "Job %s:" % job['jobid']
			print job
			#for key in job.keys():
			#	if key != "script":
			#		print '	%s:	%s' % (key,job[key])
			#print '	Script %s:' %job['script']['scriptid']
			#for key in job['script'].keys():
			#	print '		%s: %s' % (key,job['script'][key])
			#print ''

		if not sanity_check(job):
			rcodes[jobid] = 2
			continue
	
		# Here is where we run the job. 
		# Do we want to allow binary executables? If so, this might need
		# to be done a bit differently.

		# Here we don't use tmpfile because it would disappear too quickly.
		# The file needs to stick around long enough for us to run it, but
		# we also have to be confident that the file is finished.
		pid = os.getpid()
		scriptfile = '/tmp/'+`pid`+'.'+`job['jobid']`
		if debug:
			print 'scriptfile: %s' % scriptfile
		scriptfd = open(scriptfile,'w')
		scriptfd.writelines(job['script']['script_data'])
		scriptfd.close()
		os.chmod(scriptfile,0755)

		# Is this dangerous?
		rcode = False
		if sim:
			print 'Command not executed (simulation mode):\n%s' % job['script']['script_data']
		else:
			(rcode,output) = run_job(client,job,scriptfile)
			print 'rcode: %s' % str(rcode)
			print 'success code is %s' % str(job['script']['success_code'])
			output = repr(output)
			#print 'Command output to return: %s' % output
			if rcode == 'ScireDepErr':
				success = 'Failed'
				client.job_return(job['jobid'],success,output)
			elif rcode == 'Aborted':
				success = 'Aborted'
				client.job_return(job['jobid'],success)
			elif int(rcode) == int(job['script']['success_code']):
				success = 'Succeeded'
				job['script']['return_output'] = 1;  #FIXME don't hardcode hacks like this. fix the DB/UI
				if job['script']['return_output'] and (job['script']['return_output']== 1):
					client.job_return(job['jobid'],success,output)
				else:
					client.job_return(job['jobid'],success)
				# unspool_job should probably take jobid, not job
				#client.unspool_job(job)
			else:
				success = 'Failed'
				client.job_return(job['jobid'],success,output)
				
		jobs.remove(jobid)
		os.remove(scriptfile)

	return jobs


# Here we execute the command and return the output from the command.
# MATT: We still need to implement failure detection/return codes. 
def run_job(client,job,command):

	jobid = job['jobid']

	if client.job_cancelled(jobid):
		return 'Aborted','Job aborted'

	deps = job['job_dependency']
	if deps != 'None':
		deplist = ()
		deplist = job['job_dependency'].split(',')
		for jobdep in deplist:
			d_status = client.get_jstatus(jobdep)
			print "Dependency for jobid %s: %s. Status: %s" % (jobid,jobdep,d_status)
			if not d_status == 'Succeeded':
				rmsg = "Dependency for jobid %s: %s. Status: %s" % (jobid,jobdep,d_status)
				return 'ScireDepErr',rmsg

	status,output = commands.getstatusoutput(''.join([command,' 2>&1']))

	if debug:
		print 'Command Output:\n %s' % output

	if output:
		# MATT: Right now this is just an arbitrary file.
		# No reason not to use the value provided by the
		# database except for the fact that we will need to
		# change it to use syslog. Here's an idea: if
		# the logfile is defined in the database, write to
		# it, but also always write to syslog.
		# Also, we should timestamp the log entries and
		# deal with file existence.

#		self.conn = adodb.NewADOConnection(config.get("db","type"))
		logfile = job['script']['log_location']
		#if logfile and os.path.isfile(logfile):
		if logfile:
			print 'Writing log to %s' % logfile
			logging.basicConfig(level=logging.INFO,
						format='%(asctime)s %(message)s',
						filename=logfile,
						filemode='a')
			logging.info('Jobid %s: %s', job['jobid'], job['description'])
			logging.info(output)

		syslog.syslog('Jobid %s: %s' %  (job['jobid'], job['description']))
		syslog.syslog(output)

	return os.WEXITSTATUS(status),output
	
						
def sanity_check(job):
	return True

def sys_info():
	client_info = {}
#	defint = os.popen('/sbin/route|grep default').read().split()[7]
	default_interface = commands.getoutput(r"/sbin/route | awk '/^default/ { print $8 }'").strip()

#	cmdstr = '/sbin/ifconfig ' + defint + ' | grep HWaddr'
#	client_info['mac'] = os.popen(cmdstr).read().replace('\n','').split()[4]
	client_info['mac'] = commands.getoutput("/sbin/ifconfig " + default_interface + r" | awk '/HWaddr/ { print $5 }'").strip()

	#cmdstr = "/sbin/ifconfig " + defint + " | grep 'inet '"
	#client_info['ip'] = os.popen(cmdstr).read().replace('addr:','').split()[1]
	client_info['ip'] = commands.getoutput("/sbin/ifconfig " + default_interface + r" | sed -ne '/^[[:space:]]*inet addr:/{s///;s/[[:space:]]\+.*$//p}'").strip()

	try:
		client_info['hostname'] = socket.gethostbyaddr(client_info['ip'])[0]
	except:
		client_info['hostname'] = client_info['ip']

	return client_info

def verify_server_cert(conn, cert, errnum, depth, ok):
	if not os.path.isfile(config_dir + "/known_servers"):
		print "Recording server's cert digest in known_servers"
		known_servers_file = open(config_dir + "/known_servers", "w") 
		known_servers_file.write(cert.digest("sha1") + "\n")
		known_servers_file.close()
	else:
		known_servers_file = open(config_dir + "/known_servers", "r")
		known_servers = [x.strip() for x in known_servers_file.readlines()]
		known_servers_file.close()
		if not cert.digest("sha1") in known_servers:
			return False
	return True

def generate_cert_and_key(keytype="RSA", keylength=1024):
	# Generate server cert/key
	sys.stdout.write("Generating client certificate...")
	#certgen.certgen(keytype, keylength, "Scire Client", config_dir + '/client.key', config_dir + '/client.cert')
	certgen.certgen(keytype, keylength, socket.gethostname(), config_dir + '/client.key', config_dir + '/client.cert')
	print "done"

def scirec_main(client,known_jobs):
	summary = client.gen_summary(known_jobs)
	print 'Summary: ' + str(summary)

	#print client.db_version()
	if verbose: print "Acquiring jobs..."
	jobs = client.get_jobs(summary,known_jobs)

	if jobs == []:
		print 'There are no jobs.'
		leftovers = []
	elif not jobs:
		print 'Problem acquiring jobs. Quitting.'
		sys.exit(1)
	else:
		print 'Jobs: %s' %jobs
		leftovers = run_jobs(client,jobs)
	
	return leftovers

if __name__ == "__main__":
	try:
		opts, args = getopt.getopt(sys.argv[1:], 'sdDvp:h:')
	except getopt.error, msg:
		print msg
		print """usage: python %s [-s] [-d] [-v] [-D] [-h host] [-p port]
		[-s] = Simulation mode.  Doesn't actually run scripts.
		[-d] = Turn on debugging
		[-v] = Turn on verboseness
		[-D] = Run in daemon mode
		[-h host] = Set the host name/ip of the scire server
		[-p port] = Set the port to look for the scire server
		""" % sys.argv[0] 
		sys.exit(2)
	for o, a in opts:
		if o == '-s': sim = True
		elif o == '-d': 
			debug = True
			verbose = True
		elif o == '-D': daemon = True
		elif o == '-h': bind_address = a
		elif o == '-p': bind_port = int(a)
		elif o == '-v': verbose = True
		
	if verbose: print "Starting up...\nChecking for the certificate... ",

	# Check for public/private keypair and generate if they don't exist
	if not os.path.isfile(config_dir + "/client.key") or not os.path.isfile(config_dir + "/client.cert"):
		if verbose: print "No cert found. Generating.\n"
		generate_cert_and_key()

	try: 
		if verbose: print "Loading the certificate...\n"
		certfh = open(config_dir + "/client.cert","r")
	except:
		print 'Could not load certificate'
		sys.exit(1)

	certbuf = certfh.read()
	certfh.close()
	client_cert = crypto.load_certificate(crypto.FILETYPE_PEM,certbuf)

	if verbose: print "Connecting to the server...\n"
	try:
		client = SecureXMLRPCClient(bind_address, bind_port, config_dir + "/client.cert", config_dir + "/client.key", verify_server_cert)
	except:
		print "ERROR: Couldn't connect to server!\n"
		display_traceback()
		
	if debug: print client_cert.digest("sha1")
	
	if verbose: print "Registering client... "
	client_status = client.register_client()

	if not client_status:
		try:
			client_info = sys_info()
			client.add_client(certbuf,client_info)
			print "Client added successfully.  Status is pending.  Will exit now.\n"
		except:
			print "ERROR: Could not add client\n"
			display_traceback()
	else:
		print "Client Status is: %s \n" % client_status

	summary = []
	known_jobs = []

	if daemon:
		if verbose: print "Running in daemon mode.\n"
		while True:
			known_jobs = scirec_main(client,known_jobs)
			time.sleep(poll_int)
	else:
		scirec_main(client,known_jobs)