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#
# Copyright 2017 Ettus Research (National Instruments)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
Implemented RPC Servers
"""
from __future__ import print_function
from gevent.server import StreamServer
from types import graceful_exit, MPM_RPC_PORT
from mprpc import RPCServer
from six import iteritems
import time
from multiprocessing import Process
class MPMServer(RPCServer):
_db_methods = {}
def __init__(self, state, mgr):
self._state = state
# Instead do self.mboard = periphs.init_periph_manager(args...)
self.periph_manager = mgr
for db_slot, db in iteritems(mgr.dboards):
methods = (m for m in dir(db) if not m.startswith('_') and callable(getattr(db, m)))
for method in methods:
command_name = 'db_'+ db_slot + '_' + method
self._add_command(getattr(db,method), command_name)
db_methods = self._db_methods.get(db_slot, [])
db_methods.append(command_name)
self._db_methods.update({db_slot: db_methods})
# When we do init we can just add dboard/periph_manager methods with setattr(self, method)
# Maybe using partial
# To remove methods again we also have to remove them from self._methods dict (they're cached)
super(MPMServer, self).__init__()
def _add_command(self, function, command):
setattr(self, command, function)
def list_methods(self):
"""
Returns all public methods of this RPC server
"""
methods = filter(lambda entry: not entry.startswith('_'), dir(self)) # Return public methods
methods_with_docs = map(lambda m: (m, getattr(self, m).__doc__), methods)
return methods_with_docs
def ping(self, data=None):
"""
Take in data as argument and send it back
"""
return data
def claim(self, token):
"""
claim `token` - claims the MPM device with given token
"""
if self._state.claim_status.value:
if self._state.claim_token.value == token:
return True
return False
self._state.claim_status.value = True
self._state.claim_token.value = token
return True
def unclaim(self, token):
"""
unclaim `token` - unclaims the MPM device if it is claimed with this token
"""
if self._state.claim_status.value and self._state.claim_token.value == token:
self._state.claim_status.value = False
self._state.claim_token.value = ""
return True
return False
def _rpc_server_process(shared_state, port, mgr):
"""
Start the RPC server
"""
server = StreamServer(('0.0.0.0', port), handle=MPMServer(shared_state, mgr))
try:
server.serve_forever()
except:
server.close()
def spawn_rpc_process(state, udp_port, mgr):
"""
Returns a process that contains the RPC server
"""
p_args = [udp_port, state, mgr]
p = Process(target=_rpc_server_process, args=p_args)
p.start()
return p
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