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Commit ff1012ef authored by Petr Pudlak's avatar Petr Pudlak
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Move Transport from luxi.py to a separate module 

Also create a new module for RPC errors.
This allows it to be reused for other clients as well.
Signed-off-by: default avatarPetr Pudlak <pudlak@google.com>
Reviewed-by: default avatarHelga Velroyen <helgav@google.com>
parent 4869595d
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Showing with 283 additions and 198 deletions
Makefile.am
View file @ ff1012ef
......@@ -465,7 +465,9 @@ server_PYTHON = \
rpc_PYTHON = \
lib/rpc/__init__.py \
lib/rpc/node.py
lib/rpc/errors.py \
lib/rpc/node.py \
lib/rpc/transport.py
pytools_PYTHON = \
lib/tools/__init__.py \
......
lib/luxi.py
View file @ ff1012ef
#
#
# Copyright (C) 2006, 2007, 2011, 2012 Google Inc.
# Copyright (C) 2006, 2007, 2011, 2012, 2013 Google Inc.
#
# 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
......@@ -19,7 +19,7 @@
# 02110-1301, USA.
"""Module for the unix socket protocol
"""Module for the LUXI protocol
This module implements the local unix socket protocol. You only need
this module and the opcodes module in the client program in order to
......@@ -29,18 +29,34 @@ The module is also used by the master daemon.
"""
import socket
import collections
import time
import errno
import logging
from ganeti import serializer
from ganeti import constants
from ganeti import errors
from ganeti import utils
from ganeti import objects
from ganeti import pathutils
from ganeti.rpc import transport as t
from ganeti.rpc.errors import (ProtocolError, ConnectionClosedError,
TimeoutError, RequestError, NoMasterError,
PermissionError)
__all__ = [
# functions:
"ProtocolError",
"ConnectionClosedError",
"TimeoutError",
"RequestError",
"NoMasterError",
"PermissionError",
"ParseRequest",
"ParseResponse",
"FormatRequest",
"FormatResponse",
"CallLuxiMethod",
# classes:
"Client"
]
KEY_METHOD = constants.LUXI_KEY_METHOD
......@@ -73,198 +89,10 @@ REQ_SET_DRAIN_FLAG = constants.LUXI_REQ_SET_DRAIN_FLAG
REQ_SET_WATCHER_PAUSE = constants.LUXI_REQ_SET_WATCHER_PAUSE
REQ_ALL = constants.LUXI_REQ_ALL
DEF_CTMO = constants.LUXI_DEF_CTMO
DEF_RWTO = constants.LUXI_DEF_RWTO
WFJC_TIMEOUT = constants.LUXI_WFJC_TIMEOUT
class ProtocolError(errors.LuxiError):
"""Denotes an error in the LUXI protocol."""
class ConnectionClosedError(ProtocolError):
"""Connection closed error."""
class TimeoutError(ProtocolError):
"""Operation timeout error."""
class RequestError(ProtocolError):
"""Error on request.
This signifies an error in the request format or request handling,
but not (e.g.) an error in starting up an instance.
Some common conditions that can trigger this exception:
- job submission failed because the job data was wrong
- query failed because required fields were missing
"""
class NoMasterError(ProtocolError):
"""The master cannot be reached.
This means that the master daemon is not running or the socket has
been removed.
"""
class PermissionError(ProtocolError):
"""Permission denied while connecting to the master socket.
This means the user doesn't have the proper rights.
"""
class Transport:
"""Low-level transport class.
This is used on the client side.
This could be replace by any other class that provides the same
semantics to the Client. This means:
- can send messages and receive messages
- safe for multithreading
"""
def __init__(self, address, timeouts=None):
"""Constructor for the Client class.
Arguments:
- address: a valid address the the used transport class
- timeout: a list of timeouts, to be used on connect and read/write
There are two timeouts used since we might want to wait for a long
time for a response, but the connect timeout should be lower.
If not passed, we use a default of 10 and respectively 60 seconds.
Note that on reading data, since the timeout applies to an
invidual receive, it might be that the total duration is longer
than timeout value passed (we make a hard limit at twice the read
timeout).
"""
self.address = address
if timeouts is None:
self._ctimeout, self._rwtimeout = DEF_CTMO, DEF_RWTO
else:
self._ctimeout, self._rwtimeout = timeouts
self.socket = None
self._buffer = ""
self._msgs = collections.deque()
try:
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
# Try to connect
try:
utils.Retry(self._Connect, 1.0, self._ctimeout,
args=(self.socket, address, self._ctimeout))
except utils.RetryTimeout:
raise TimeoutError("Connect timed out")
self.socket.settimeout(self._rwtimeout)
except (socket.error, NoMasterError):
if self.socket is not None:
self.socket.close()
self.socket = None
raise
@staticmethod
def _Connect(sock, address, timeout):
sock.settimeout(timeout)
try:
sock.connect(address)
except socket.timeout, err:
raise TimeoutError("Connect timed out: %s" % str(err))
except socket.error, err:
error_code = err.args[0]
if error_code in (errno.ENOENT, errno.ECONNREFUSED):
raise NoMasterError(address)
elif error_code in (errno.EPERM, errno.EACCES):
raise PermissionError(address)
elif error_code == errno.EAGAIN:
# Server's socket backlog is full at the moment
raise utils.RetryAgain()
raise
def _CheckSocket(self):
"""Make sure we are connected.
"""
if self.socket is None:
raise ProtocolError("Connection is closed")
def Send(self, msg):
"""Send a message.
This just sends a message and doesn't wait for the response.
"""
if constants.LUXI_EOM in msg:
raise ProtocolError("Message terminator found in payload")
self._CheckSocket()
try:
# TODO: sendall is not guaranteed to send everything
self.socket.sendall(msg + constants.LUXI_EOM)
except socket.timeout, err:
raise TimeoutError("Sending timeout: %s" % str(err))
def Recv(self):
"""Try to receive a message from the socket.
In case we already have messages queued, we just return from the
queue. Otherwise, we try to read data with a _rwtimeout network
timeout, and making sure we don't go over 2x_rwtimeout as a global
limit.
"""
self._CheckSocket()
etime = time.time() + self._rwtimeout
while not self._msgs:
if time.time() > etime:
raise TimeoutError("Extended receive timeout")
while True:
try:
data = self.socket.recv(4096)
except socket.timeout, err:
raise TimeoutError("Receive timeout: %s" % str(err))
except socket.error, err:
if err.args and err.args[0] == errno.EAGAIN:
continue
raise
break
if not data:
raise ConnectionClosedError("Connection closed while reading")
new_msgs = (self._buffer + data).split(constants.LUXI_EOM)
self._buffer = new_msgs.pop()
self._msgs.extend(new_msgs)
return self._msgs.popleft()
def Call(self, msg):
"""Send a message and wait for the response.
This is just a wrapper over Send and Recv.
"""
self.Send(msg)
return self.Recv()
def Close(self):
"""Close the socket"""
if self.socket is not None:
self.socket.close()
self.socket = None
def ParseRequest(msg):
"""Parses a LUXI request message.
......@@ -380,7 +208,7 @@ class Client(object):
implements data serialization/deserialization.
"""
def __init__(self, address=None, timeouts=None, transport=Transport):
def __init__(self, address=None, timeouts=None, transport=t.Transport):
"""Constructor for the Client class.
Arguments:
......
lib/rpc/errors.py 0 → 100644
View file @ ff1012ef
#
#
# Copyright (C) 2013 Google Inc.
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
"""Module that defines a transport for RPC connections.
A transport can send to and receive messages from some endpoint.
"""
from ganeti.errors import LuxiError
class ProtocolError(LuxiError):
"""Denotes an error in the LUXI protocol."""
class ConnectionClosedError(ProtocolError):
"""Connection closed error."""
class TimeoutError(ProtocolError):
"""Operation timeout error."""
class RequestError(ProtocolError):
"""Error on request.
This signifies an error in the request format or request handling,
but not (e.g.) an error in starting up an instance.
Some common conditions that can trigger this exception:
- job submission failed because the job data was wrong
- query failed because required fields were missing
"""
class NoMasterError(ProtocolError):
"""The master cannot be reached.
This means that the master daemon is not running or the socket has
been removed.
"""
class PermissionError(ProtocolError):
"""Permission denied while connecting to the master socket.
This means the user doesn't have the proper rights.
"""
lib/rpc/transport.py 0 → 100644
View file @ ff1012ef
#
#
# Copyright (C) 2013 Google Inc.
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
"""Module that defines a transport for RPC connections.
A transport can send to and receive messages from some endpoint.
"""
import collections
import errno
import socket
import time
from ganeti import constants
from ganeti import utils
from ganeti.rpc import errors
DEF_CTMO = constants.LUXI_DEF_CTMO
DEF_RWTO = constants.LUXI_DEF_RWTO
class Transport:
"""Low-level transport class.
This is used on the client side.
This could be replace by any other class that provides the same
semantics to the Client. This means:
- can send messages and receive messages
- safe for multithreading
"""
def __init__(self, address, timeouts=None):
"""Constructor for the Client class.
Arguments:
- address: a valid address the the used transport class
- timeout: a list of timeouts, to be used on connect and read/write
There are two timeouts used since we might want to wait for a long
time for a response, but the connect timeout should be lower.
If not passed, we use a default of 10 and respectively 60 seconds.
Note that on reading data, since the timeout applies to an
invidual receive, it might be that the total duration is longer
than timeout value passed (we make a hard limit at twice the read
timeout).
"""
self.address = address
if timeouts is None:
self._ctimeout, self._rwtimeout = DEF_CTMO, DEF_RWTO
else:
self._ctimeout, self._rwtimeout = timeouts
self.socket = None
self._buffer = ""
self._msgs = collections.deque()
try:
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
# Try to connect
try:
utils.Retry(self._Connect, 1.0, self._ctimeout,
args=(self.socket, address, self._ctimeout))
except utils.RetryTimeout:
raise errors.TimeoutError("Connect timed out")
self.socket.settimeout(self._rwtimeout)
except (socket.error, errors.NoMasterError):
if self.socket is not None:
self.socket.close()
self.socket = None
raise
@staticmethod
def _Connect(sock, address, timeout):
sock.settimeout(timeout)
try:
sock.connect(address)
except socket.timeout, err:
raise errors.TimeoutError("Connect timed out: %s" % str(err))
except socket.error, err:
error_code = err.args[0]
if error_code in (errno.ENOENT, errno.ECONNREFUSED):
raise errors.NoMasterError(address)
elif error_code in (errno.EPERM, errno.EACCES):
raise errors.PermissionError(address)
elif error_code == errno.EAGAIN:
# Server's socket backlog is full at the moment
raise utils.RetryAgain()
raise
def _CheckSocket(self):
"""Make sure we are connected.
"""
if self.socket is None:
raise errors.ProtocolError("Connection is closed")
def Send(self, msg):
"""Send a message.
This just sends a message and doesn't wait for the response.
"""
if constants.LUXI_EOM in msg:
raise errors.ProtocolError("Message terminator found in payload")
self._CheckSocket()
try:
# TODO: sendall is not guaranteed to send everything
self.socket.sendall(msg + constants.LUXI_EOM)
except socket.timeout, err:
raise errors.TimeoutError("Sending timeout: %s" % str(err))
def Recv(self):
"""Try to receive a message from the socket.
In case we already have messages queued, we just return from the
queue. Otherwise, we try to read data with a _rwtimeout network
timeout, and making sure we don't go over 2x_rwtimeout as a global
limit.
"""
self._CheckSocket()
etime = time.time() + self._rwtimeout
while not self._msgs:
if time.time() > etime:
raise errors.TimeoutError("Extended receive timeout")
while True:
try:
data = self.socket.recv(4096)
except socket.timeout, err:
raise errors.TimeoutError("Receive timeout: %s" % str(err))
except socket.error, err:
if err.args and err.args[0] == errno.EAGAIN:
continue
raise
break
if not data:
raise errors.ConnectionClosedError("Connection closed while reading")
new_msgs = (self._buffer + data).split(constants.LUXI_EOM)
self._buffer = new_msgs.pop()
self._msgs.extend(new_msgs)
return self._msgs.popleft()
def Call(self, msg):
"""Send a message and wait for the response.
This is just a wrapper over Send and Recv.
"""
self.Send(msg)
return self.Recv()
def Close(self):
"""Close the socket"""
if self.socket is not None:
self.socket.close()
self.socket = None
lib/runtime.py
View file @ ff1012ef
......@@ -32,6 +32,7 @@ import platform
from ganeti import constants
from ganeti import errors
from ganeti import luxi
from ganeti.rpc.errors import NoMasterError
from ganeti import pathutils
from ganeti import ssconf
from ganeti import utils
......@@ -266,7 +267,7 @@ def GetClient(query=True):
# TODO: Cache object?
try:
client = luxi.Client(address=address)
except luxi.NoMasterError:
except NoMasterError:
ss = ssconf.SimpleStore()
# Try to read ssconf file
......
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