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python jsonrpc: Allow jsonrpc_session to have more than one remote.

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Python IDL implementation doesn't have the support to connect to the
cluster dbs. This patch adds this support. We are still missing the
support in python idl class to connect to the cluster master. That
support will be added in an upcoming patch.

This patch is similar to the commit 8cf6bbb184 which added multiple remote
support in the C jsonrpc implementation.

Acked-by: Mark Michelson <mmichels@redhat.com>
Signed-off-by: Numan Siddique <nusiddiq@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Numan Siddique
2018-08-07 17:08:11 +05:30
committed by Ben Pfaff
parent c1aa16d191
commit 31e434fc98
4 changed files with 114 additions and 13 deletions
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41
python/ovs/jsonrpc.py
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@@ -14,6 +14,7 @@
import codecs
import errno
import os
import random
import sys
import ovs.json
@@ -368,12 +369,17 @@ class Connection(object):
class Session(object):
"""A JSON-RPC session with reconnection."""
def __init__(self, reconnect, rpc):
def __init__(self, reconnect, rpc, remotes):
self.reconnect = reconnect
self.rpc = rpc
self.stream = None
self.pstream = None
self.seqno = 0
if type(remotes) != list:
remotes = [remotes]
self.remotes = remotes
random.shuffle(self.remotes)
self.next_remote = 0
@staticmethod
def open(name, probe_interval=None):
@@ -393,28 +399,38 @@ class Session(object):
feature. If non-zero the value will be forced to at least 1000
milliseconds. If None it will just use the default value in OVS.
"""
reconnect = ovs.reconnect.Reconnect(ovs.timeval.msec())
reconnect.set_name(name)
reconnect.enable(ovs.timeval.msec())
return Session.open_multiple([name], probe_interval=probe_interval)
if ovs.stream.PassiveStream.is_valid_name(name):
@staticmethod
def open_multiple(remotes, probe_interval=None):
reconnect = ovs.reconnect.Reconnect(ovs.timeval.msec())
session = Session(reconnect, None, remotes)
session.pick_remote()
reconnect.enable(ovs.timeval.msec())
reconnect.set_backoff_free_tries(len(remotes))
if ovs.stream.PassiveStream.is_valid_name(reconnect.get_name()):
reconnect.set_passive(True, ovs.timeval.msec())
if not ovs.stream.stream_or_pstream_needs_probes(name):
if not ovs.stream.stream_or_pstream_needs_probes(reconnect.get_name()):
reconnect.set_probe_interval(0)
elif probe_interval is not None:
reconnect.set_probe_interval(probe_interval)
return Session(reconnect, None)
return session
@staticmethod
def open_unreliably(jsonrpc):
reconnect = ovs.reconnect.Reconnect(ovs.timeval.msec())
session = Session(reconnect, None, [jsonrpc.name])
reconnect.set_quiet(True)
reconnect.set_name(jsonrpc.name)
session.pick_remote()
reconnect.set_max_tries(0)
reconnect.connected(ovs.timeval.msec())
return Session(reconnect, jsonrpc)
return session
def pick_remote(self):
self.reconnect.set_name(self.remotes[self.next_remote])
self.next_remote = (self.next_remote + 1) % len(self.remotes)
def close(self):
if self.rpc is not None:
@@ -448,6 +464,8 @@ class Session(object):
self.reconnect.connecting(ovs.timeval.msec())
else:
self.reconnect.connect_failed(ovs.timeval.msec(), error)
self.stream = None
self.pick_remote()
elif self.pstream is None:
error, self.pstream = ovs.stream.PassiveStream.open(name)
if not error:
@@ -490,6 +508,7 @@ class Session(object):
if error != 0:
self.reconnect.disconnected(ovs.timeval.msec(), error)
self.__disconnect()
self.pick_remote()
elif self.stream is not None:
self.stream.run()
error = self.stream.connect()
@@ -499,6 +518,7 @@ class Session(object):
self.stream = None
elif error != errno.EAGAIN:
self.reconnect.connect_failed(ovs.timeval.msec(), error)
self.pick_remote()
self.stream.close()
self.stream = None
@@ -583,3 +603,6 @@ class Session(object):
def force_reconnect(self):
self.reconnect.force_reconnect(ovs.timeval.msec())
def get_num_of_remotes(self):
return len(self.remotes)