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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 glob
import pprint
from func.commonconfig import CMConfig
from func.config import read_config, CONFIG_FILE
import sslclient
import command
import func_command
# ===================================
# 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 CommandAutomagic(object):
"""
This allows a client object to act as if it were one machine, when in
reality it represents many.
"""
def __init__(self, clientref, base):
self.base = base
self.clientref = clientref
def __getattr__(self,name):
base2 = self.base[:]
base2.append(name)
return CommandAutomagic(self.clientref, base2)
def __call__(self, *args):
if not self.base:
raise AttributeError("something wrong here")
if len(self.base) < 2:
raise AttributeError("no method called: %s" % ".".join(self.base))
module = self.base[0]
method = ".".join(self.base[1:])
return self.clientref.run(module,method,args)
# ===================================
class Client(object):
def __init__(self, server_spec, port=DEFAULT_PORT, interactive=False,
verbose=False, noglobs=False, config=None):
"""
Constructor.
@server_spec -- something like "*.example.org" or "foosball"
@port -- is the port where all funcd processes should be contacted
@verbose -- whether to print unneccessary things
@noglobs -- specifies server_spec is not a glob, and run should return single values
@config -- optional config object
"""
self.config = config
if config is None:
self.config = read_config(CONFIG_FILE, CMConfig)
self.server_spec = server_spec
self.port = port
self.verbose = verbose
self.interactive = interactive
self.noglobs = noglobs
self.servers = self.expand_servers(self.server_spec)
# default cert/ca/key is the same as the certmaster ca - need to
# be able to change that on the cli
self.key = '%s/funcmaster.key' % self.config.cadir
self.cert = '%s/funcmaster.crt' % self.config.cadir
# yes, they're the same, that's the point
self.ca = '%s/funcmaster.crt' % self.config.cadir
# -----------------------------------------------
def expand_servers(self,spec):
"""
Given a regex/blob of servers, expand to a list
of server ids.
"""
if self.noglobs:
return [ "https://%s:%s" % (spec, self.port) ]
all_hosts = []
all_certs = []
seperate_gloobs = spec.split(";")
for each_gloob in seperate_gloobs:
actual_gloob = "%s/%s.cert" % (self.config.certroot, each_gloob)
certs = glob.glob(actual_gloob)
for cert in certs:
all_certs.append(cert)
host = cert.replace(self.config.certroot,"")[1:-5]
all_hosts.append(host)
all_urls = []
for x in all_hosts:
all_urls.append("https://%s:%s" % (x, self.port))
if self.verbose and len(all_urls) == 0:
sys.stderr.write("no hosts matched\n")
return all_urls
# -----------------------------------------------
def __getattr__(self, name):
"""
This getattr allows manipulation of the object as if it were
a XMLRPC handle to a single machine, when in reality it is a handle
to an unspecified number of machines.
So, it enables stuff like this:
Client("*.example.org").yum.install("foo")
# WARNING: any missing values in Client's source will yield
# strange errors with this engaged. Be aware of that.
"""
return CommandAutomagic(self, [name])
# -----------------------------------------------
def run(self, module, method, args):
"""
Invoke a remote method on one or more servers.
Run returns a hash, the keys are server names, the values are the
returns.
The returns may include exception objects.
If Client() was constructed with noglobs=True, the return is instead
just a single value, not a hash.
"""
results = {}
for server in self.servers:
conn = sslclient.FuncServer(server, self.key, self.cert, self.ca )
# conn = xmlrpclib.ServerProxy(server)
if self.interactive:
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 self.interactive:
print retval
# pprint.pprint(retval)
except Exception, e:
retval = e
if self.interactive:
sys.stderr.write("remote exception on %s: %s\n" %
(server, str(e)))
if self.noglobs:
return retval
else:
left = server.rfind("/")+1
right = server.rfind(":")
server_name = server[left:right]
results[server_name] = 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.
"""
numbers = []
for x in results.keys():
# faults are the most important
if type(x) == Exception:
return -911
# then pay attention to numbers
if type(x) == int:
numbers.append(x)
# if there were no numbers, assume 0
if len(numbers) == 0:
return 0
# if there were numbers, return the highest
# (presumably the worst error code
max = -9999
for x in numbers:
if x > max:
max = x
return max
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