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# Copyright (c) 2009, 2010 Nicira Networks
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import errno
import getopt
import os
import sys
import ovs.daemon
import ovs.json
import ovs.jsonrpc
import ovs.poller
import ovs.stream
def handle_rpc(rpc, msg):
done = False
reply = None
if msg.type == ovs.jsonrpc.Message.T_REQUEST:
if msg.method == "echo":
reply = ovs.jsonrpc.Message.create_reply(msg.params, msg.id)
else:
reply = ovs.jsonrpc.Message.create_error(
{"error": "unknown method"}, msg.id)
sys.stderr.write("unknown request %s" % msg.method)
elif msg.type == ovs.jsonrpc.Message.T_NOTIFY:
if msg.method == "shutdown":
done = True
else:
rpc.error(errno.ENOTTY)
sys.stderr.write("unknown notification %s" % msg.method)
else:
rpc.error(errno.EPROTO)
sys.stderr.write("unsolicited JSON-RPC reply or error\n")
if reply:
rpc.send(reply)
return done
def do_listen(name):
ovs.daemon.die_if_already_running()
error, pstream = ovs.stream.PassiveStream.open(name)
if error:
sys.stderr.write("could not listen on \"%s\": %s\n"
% (name, os.strerror(error)))
sys.exit(1)
ovs.daemon.daemonize()
rpcs = []
done = False
while True:
# Accept new connections.
error, stream = pstream.accept()
if stream:
rpcs.append(ovs.jsonrpc.Connection(stream))
elif error != errno.EAGAIN:
sys.stderr.write("PassiveStream.accept() failed\n")
sys.exit(1)
# Service existing connections.
dead_rpcs = []
for rpc in rpcs:
rpc.run()
error = 0
if not rpc.get_backlog():
error, msg = rpc.recv()
if not error:
if handle_rpc(rpc, msg):
done = True
error = rpc.get_status()
if error:
rpc.close()
dead_rpcs.append(rpc)
rpcs = [rpc for rpc in rpcs if not rpc in dead_rpcs]
if done and not rpcs:
break
poller = ovs.poller.Poller()
pstream.wait(poller)
for rpc in rpcs:
rpc.wait(poller)
if not rpc.get_backlog():
rpc.recv_wait(poller)
poller.block()
pstream.close()
def do_request(name, method, params_string):
params = ovs.json.from_string(params_string)
msg = ovs.jsonrpc.Message.create_request(method, params)
s = msg.is_valid()
if s:
sys.stderr.write("not a valid JSON-RPC request: %s\n" % s)
sys.exit(1)
error, stream = ovs.stream.Stream.open_block(ovs.stream.Stream.open(name))
if error:
sys.stderr.write("could not open \"%s\": %s\n"
% (name, os.strerror(error)))
sys.exit(1)
rpc = ovs.jsonrpc.Connection(stream)
error = rpc.send(msg)
if error:
sys.stderr.write("could not send request: %s\n" % os.strerror(error))
sys.exit(1)
error, msg = rpc.recv_block()
if error:
sys.stderr.write("error waiting for reply: %s\n" % os.strerror(error))
sys.exit(1)
print ovs.json.to_string(msg.to_json())
rpc.close()
def do_notify(name, method, params_string):
params = ovs.json.from_string(params_string)
msg = ovs.jsonrpc.Message.create_notify(method, params)
s = msg.is_valid()
if s:
sys.stderr.write("not a valid JSON-RPC notification: %s\n" % s)
sys.exit(1)
error, stream = ovs.stream.Stream.open_block(ovs.stream.Stream.open(name))
if error:
sys.stderr.write("could not open \"%s\": %s\n"
% (name, os.strerror(error)))
sys.exit(1)
rpc = ovs.jsonrpc.Connection(stream)
error = rpc.send_block(msg)
if error:
sys.stderr.write("could not send notification: %s\n"
% os.strerror(error))
sys.exit(1)
rpc.close()
def main(argv):
try:
options, args = getopt.gnu_getopt(
argv[1:], 'h', ["help"] + ovs.daemon.LONG_OPTIONS)
except getopt.GetoptError, geo:
sys.stderr.write("%s: %s\n" % (ovs.util.PROGRAM_NAME, geo.msg))
sys.exit(1)
for key, value in options:
if key in ['h', '--help']:
usage()
elif not ovs.daemon.parse_opt(key, value):
sys.stderr.write("%s: unhandled option %s\n"
% (ovs.util.PROGRAM_NAME, key))
sys.exit(1)
commands = {"listen": (do_listen, 1),
"request": (do_request, 3),
"notify": (do_notify, 3),
"help": (usage, (0,))}
command_name = args[0]
args = args[1:]
if not command_name in commands:
sys.stderr.write("%s: unknown command \"%s\" "
"(use --help for help)\n" % (argv0, command_name))
sys.exit(1)
func, n_args = commands[command_name]
if type(n_args) == tuple:
if len(args) < n_args[0]:
sys.stderr.write("%s: \"%s\" requires at least %d arguments but "
"only %d provided\n"
% (argv0, command_name, n_args, len(args)))
sys.exit(1)
elif type(n_args) == int:
if len(args) != n_args:
sys.stderr.write("%s: \"%s\" requires %d arguments but %d "
"provided\n"
% (argv0, command_name, n_args, len(args)))
sys.exit(1)
else:
assert False
func(*args)
def usage():
sys.stdout.write("""\
%s: JSON-RPC test utility for Python
usage: %s [OPTIONS] COMMAND [ARG...]
listen LOCAL listen for connections on LOCAL
request REMOTE METHOD PARAMS send request, print reply
notify REMOTE METHOD PARAMS send notification and exit
""" % (ovs.util.PROGRAM_NAME, ovs.util.PROGRAM_NAME))
ovs.stream.usage("JSON-RPC", True, True, True)
ovs.daemon.usage()
sys.stdout.write("""
Other options:
-h, --help display this help message
""")
sys.exit(0)
if __name__ == '__main__':
main(sys.argv)
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