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#!/usr/bin/python
##
## func command line interface & client lib
##
## Copyright 2007, Red Hat, Inc
## Michael DeHaan <mdehaan@redhat.com>
## +AUTHORS
##
## This software may be freely redistributed under the terms of the GNU
## general public license.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
##
import optparse
import sys
import xmlrpclib
import traceback
# ===================================
# defaults
# TO DO: some of this may want to come from config later
DEFAULT_PORT = 51234
FUNC_USAGE = "Usage: %s [ --help ] [ --verbose ] target.example.org module method arg1 [...]"
# ===================================
class Client():
def __init__(self, server_spec, port=DEFAULT_PORT, verbose=False, silent=False):
"""
Constructor.
server_spec is something like "*.example.org" or "foosball"
everything else optional and mostly self explanatory.
"""
self.server_spec = server_spec
self.port = port
self.verbose = verbose
self.silent = silent
self.servers = self.expand_servers(self.server_spec)
# -----------------------------------------------
def expand_servers(self,spec):
"""
Given a regex/blob of servers, expand to a list
of server ids.
"""
# FIXME: currently globbing is not supported (yet)
# needs knowledge of the tree of certs
# will be done soon
results = []
# FIXME: add SSL
results.append("http://%s:%s" % (spec, self.port))
return results
# -----------------------------------------------
def run(self, module, method, args):
"""
Invoke a remote method on one or more servers.
"""
count = len(self.servers)
results = []
for server in self.servers:
# FIXME: add SSL
conn = xmlrpclib.ServerProxy(server)
if self.verbose:
sys.stderr.write("on %s running %s %s (%s)\n" % (server, module, method, ",".join(args)))
# FIXME: support userland command subclassing only if a module
# is present, otherwise run as follows. -- MPD
try:
# thats some pretty code right there aint it? -akl
# we can't call "call" on s, since thats a rpc, so
# we call gettatr around it.
meth = "%s.%s" % (module, method)
retval = getattr(conn, meth)(*args[:])
if not self.silent:
print retval
except Exception, e:
retval = e
if not self.silent:
sys.stderr.write("remote exception on %s: %s\n" % (server, str(e)))
results.append(retval)
return results
# -----------------------------------------------
def cli_return(self,results):
"""
As the return code list could return strings and exceptions
and all sorts of crazy stuff, reduce it down to a simple
integer return. It may not be useful but we need one.
"""
nonzeros = []
for x in results:
# faults are the most important
if type(x) == Exception:
return -911
# then pay attention to non-zeros
if type(x) == int:
nonzeros.append(x)
if len(nonzeros) > 0:
return nonzeros[1]
return 0
# ===================================================================
class FuncCommandLine():
def __init__(self,myname,args):
"""
Constructor. Takes name of program + arguments.
"""
self.myname = myname
self.args = args
self.verbose = 0
self.server_spec = None
self.port = DEFAULT_PORT
# -----------------------------------------------
def usage(self):
"""
Returns usage string for command line users.
"""
return FUNC_USAGE % self.myname
# -----------------------------------------------
def run(self):
"""
Engages the command line.
"""
rc = self.parse_command_line()
if rc != 0:
return rc
return self.run_command()
# -----------------------------------------------
def parse_command_line(self):
"""
Parses the command line and loads up all the variables.
"""
# parse options
p = optparse.OptionParser()
p.add_option("-v","--verbose",dest="verbose",action="store_true")
p.add_option("-p","--port",dest="port",default=DEFAULT_PORT)
(options, args) = p.parse_args(self.args)
self.args = args
self.verbose = options.verbose
self.port = options.port
# self.help = options.help
# provided for free:
#
#if self.help:
# print self.usage()
# return -411
# process arguments
# a good Klingon program does not have parameters
# it has arguments, and it always wins them.
if len(args) < 3:
print self.usage()
return -411
self.server_spec = self.args[0]
self.module = self.args[1]
self.method = self.args[2]
self.method_args = self.args[3:]
return 0
# -----------------------------------------------
def run_command(self):
"""
Runs the actual command.
"""
client = Client(self.server_spec,port=self.port,verbose=self.verbose)
results = client.run(self.module, self.method, self.method_args)
# TO DO: add multiplexer support
# probably as a higher level module.
return client.cli_return(results)
# ===================================================================
if __name__ == "__main__":
# this is what /usr/bin/func will run
myname, argv = sys.argv[0], sys.argv[1:]
cli = FuncCommandLine(myname,argv)
rc = cli.run()
sys.exit(rc)
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