root / lib / rpc.py @ 81f7ea25
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#
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# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Inter-node RPC library.
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"""
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# pylint: disable=C0103,R0201,R0904
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# C0103: Invalid name, since call_ are not valid
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# R0201: Method could be a function, we keep all rpcs instance methods
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# as not to change them back and forth between static/instance methods
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# if they need to start using instance attributes
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# R0904: Too many public methods
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import logging |
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import zlib |
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import base64 |
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import pycurl |
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import threading |
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from ganeti import utils |
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from ganeti import objects |
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from ganeti import http |
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from ganeti import serializer |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti import netutils |
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from ganeti import ssconf |
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from ganeti import runtime |
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from ganeti import compat |
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from ganeti import rpc_defs |
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# Special module generated at build time
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from ganeti import _generated_rpc |
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# pylint has a bug here, doesn't see this import
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import ganeti.http.client # pylint: disable=W0611 |
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# Timeout for connecting to nodes (seconds)
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_RPC_CONNECT_TIMEOUT = 5
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_RPC_CLIENT_HEADERS = [ |
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"Content-type: %s" % http.HTTP_APP_JSON,
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"Expect:",
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] |
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# Various time constants for the timeout table
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_TMO_URGENT = 60 # one minute |
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_TMO_FAST = 5 * 60 # five minutes |
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_TMO_NORMAL = 15 * 60 # 15 minutes |
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_TMO_SLOW = 3600 # one hour |
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_TMO_4HRS = 4 * 3600 |
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_TMO_1DAY = 86400
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#: Special value to describe an offline host
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_OFFLINE = object()
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def Init(): |
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"""Initializes the module-global HTTP client manager.
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Must be called before using any RPC function and while exactly one thread is
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running.
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"""
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# curl_global_init(3) and curl_global_cleanup(3) must be called with only
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# one thread running. This check is just a safety measure -- it doesn't
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# cover all cases.
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assert threading.activeCount() == 1, \ |
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"Found more than one active thread when initializing pycURL"
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logging.info("Using PycURL %s", pycurl.version)
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pycurl.global_init(pycurl.GLOBAL_ALL) |
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def Shutdown(): |
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"""Stops the module-global HTTP client manager.
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Must be called before quitting the program and while exactly one thread is
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running.
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"""
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pycurl.global_cleanup() |
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def _ConfigRpcCurl(curl): |
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noded_cert = str(constants.NODED_CERT_FILE)
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curl.setopt(pycurl.FOLLOWLOCATION, False)
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curl.setopt(pycurl.CAINFO, noded_cert) |
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curl.setopt(pycurl.SSL_VERIFYHOST, 0)
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curl.setopt(pycurl.SSL_VERIFYPEER, True)
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curl.setopt(pycurl.SSLCERTTYPE, "PEM")
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curl.setopt(pycurl.SSLCERT, noded_cert) |
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curl.setopt(pycurl.SSLKEYTYPE, "PEM")
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curl.setopt(pycurl.SSLKEY, noded_cert) |
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curl.setopt(pycurl.CONNECTTIMEOUT, _RPC_CONNECT_TIMEOUT) |
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def RunWithRPC(fn): |
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"""RPC-wrapper decorator.
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When applied to a function, it runs it with the RPC system
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initialized, and it shutsdown the system afterwards. This means the
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function must be called without RPC being initialized.
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"""
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def wrapper(*args, **kwargs): |
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Init() |
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try:
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return fn(*args, **kwargs)
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finally:
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Shutdown() |
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return wrapper
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def _Compress(data): |
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"""Compresses a string for transport over RPC.
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Small amounts of data are not compressed.
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@type data: str
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@param data: Data
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@rtype: tuple
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@return: Encoded data to send
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"""
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# Small amounts of data are not compressed
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if len(data) < 512: |
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return (constants.RPC_ENCODING_NONE, data)
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# Compress with zlib and encode in base64
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return (constants.RPC_ENCODING_ZLIB_BASE64,
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base64.b64encode(zlib.compress(data, 3)))
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class RpcResult(object): |
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"""RPC Result class.
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This class holds an RPC result. It is needed since in multi-node
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calls we can't raise an exception just because one one out of many
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failed, and therefore we use this class to encapsulate the result.
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@ivar data: the data payload, for successful results, or None
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@ivar call: the name of the RPC call
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@ivar node: the name of the node to which we made the call
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@ivar offline: whether the operation failed because the node was
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offline, as opposed to actual failure; offline=True will always
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imply failed=True, in order to allow simpler checking if
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the user doesn't care about the exact failure mode
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@ivar fail_msg: the error message if the call failed
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"""
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def __init__(self, data=None, failed=False, offline=False, |
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call=None, node=None): |
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self.offline = offline
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self.call = call
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self.node = node
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if offline:
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self.fail_msg = "Node is marked offline" |
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self.data = self.payload = None |
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elif failed:
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self.fail_msg = self._EnsureErr(data) |
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self.data = self.payload = None |
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else:
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self.data = data
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if not isinstance(self.data, (tuple, list)): |
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self.fail_msg = ("RPC layer error: invalid result type (%s)" % |
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type(self.data)) |
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self.payload = None |
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elif len(data) != 2: |
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self.fail_msg = ("RPC layer error: invalid result length (%d), " |
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"expected 2" % len(self.data)) |
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self.payload = None |
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elif not self.data[0]: |
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self.fail_msg = self._EnsureErr(self.data[1]) |
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self.payload = None |
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else:
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# finally success
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self.fail_msg = None |
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self.payload = data[1] |
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for attr_name in ["call", "data", "fail_msg", |
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"node", "offline", "payload"]: |
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assert hasattr(self, attr_name), "Missing attribute %s" % attr_name |
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@staticmethod
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def _EnsureErr(val): |
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"""Helper to ensure we return a 'True' value for error."""
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if val:
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return val
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else:
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return "No error information" |
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def Raise(self, msg, prereq=False, ecode=None): |
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"""If the result has failed, raise an OpExecError.
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This is used so that LU code doesn't have to check for each
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result, but instead can call this function.
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"""
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if not self.fail_msg: |
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return
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if not msg: # one could pass None for default message |
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msg = ("Call '%s' to node '%s' has failed: %s" %
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(self.call, self.node, self.fail_msg)) |
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else:
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msg = "%s: %s" % (msg, self.fail_msg) |
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if prereq:
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ec = errors.OpPrereqError |
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else:
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ec = errors.OpExecError |
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if ecode is not None: |
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args = (msg, ecode) |
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else:
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args = (msg, ) |
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raise ec(*args) # pylint: disable=W0142 |
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def _SsconfResolver(node_list, _, |
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ssc=ssconf.SimpleStore, |
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nslookup_fn=netutils.Hostname.GetIP): |
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"""Return addresses for given node names.
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@type node_list: list
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@param node_list: List of node names
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@type ssc: class
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@param ssc: SimpleStore class that is used to obtain node->ip mappings
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@type nslookup_fn: callable
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@param nslookup_fn: function use to do NS lookup
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@rtype: list of tuple; (string, string)
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@return: List of tuples containing node name and IP address
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"""
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ss = ssc() |
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iplist = ss.GetNodePrimaryIPList() |
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family = ss.GetPrimaryIPFamily() |
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ipmap = dict(entry.split() for entry in iplist) |
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result = [] |
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for node in node_list: |
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ip = ipmap.get(node) |
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if ip is None: |
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ip = nslookup_fn(node, family=family) |
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result.append((node, ip)) |
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return result
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class _StaticResolver: |
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def __init__(self, addresses): |
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"""Initializes this class.
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"""
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self._addresses = addresses
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def __call__(self, hosts, _): |
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"""Returns static addresses for hosts.
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"""
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assert len(hosts) == len(self._addresses) |
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return zip(hosts, self._addresses) |
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def _CheckConfigNode(name, node, accept_offline_node): |
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"""Checks if a node is online.
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@type name: string
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@param name: Node name
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@type node: L{objects.Node} or None
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@param node: Node object
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"""
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if node is None: |
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# Depend on DNS for name resolution
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ip = name |
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elif node.offline and not accept_offline_node: |
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ip = _OFFLINE |
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else:
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ip = node.primary_ip |
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return (name, ip)
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def _NodeConfigResolver(single_node_fn, all_nodes_fn, hosts, opts): |
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"""Calculate node addresses using configuration.
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"""
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accept_offline_node = (opts is rpc_defs.ACCEPT_OFFLINE_NODE)
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assert accept_offline_node or opts is None, "Unknown option" |
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# Special case for single-host lookups
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if len(hosts) == 1: |
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(name, ) = hosts |
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return [_CheckConfigNode(name, single_node_fn(name), accept_offline_node)]
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else:
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all_nodes = all_nodes_fn() |
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return [_CheckConfigNode(name, all_nodes.get(name, None), |
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accept_offline_node) |
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for name in hosts] |
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class _RpcProcessor: |
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def __init__(self, resolver, port, lock_monitor_cb=None): |
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"""Initializes this class.
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@param resolver: callable accepting a list of hostnames, returning a list
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of tuples containing name and IP address (IP address can be the name or
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the special value L{_OFFLINE} to mark offline machines)
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@type port: int
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@param port: TCP port
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@param lock_monitor_cb: Callable for registering with lock monitor
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"""
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self._resolver = resolver
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self._port = port
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self._lock_monitor_cb = lock_monitor_cb
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@staticmethod
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def _PrepareRequests(hosts, port, procedure, body, read_timeout): |
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"""Prepares requests by sorting offline hosts into separate list.
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@type body: dict
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@param body: a dictionary with per-host body data
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"""
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results = {} |
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requests = {} |
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assert isinstance(body, dict) |
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assert len(body) == len(hosts) |
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assert compat.all(isinstance(v, str) for v in body.values()) |
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assert frozenset(map(compat.fst, hosts)) == frozenset(body.keys()), \ |
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"%s != %s" % (hosts, body.keys())
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for (name, ip) in hosts: |
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if ip is _OFFLINE: |
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# Node is marked as offline
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results[name] = RpcResult(node=name, offline=True, call=procedure)
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else:
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requests[name] = \ |
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http.client.HttpClientRequest(str(ip), port,
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http.HTTP_POST, str("/%s" % procedure), |
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headers=_RPC_CLIENT_HEADERS, |
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post_data=body[name], |
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read_timeout=read_timeout, |
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nicename="%s/%s" % (name, procedure),
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curl_config_fn=_ConfigRpcCurl) |
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return (results, requests)
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@staticmethod
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def _CombineResults(results, requests, procedure): |
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"""Combines pre-computed results for offline hosts with actual call results.
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"""
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for name, req in requests.items(): |
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if req.success and req.resp_status_code == http.HTTP_OK: |
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host_result = RpcResult(data=serializer.LoadJson(req.resp_body), |
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node=name, call=procedure) |
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else:
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# TODO: Better error reporting
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if req.error:
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msg = req.error |
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else:
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msg = req.resp_body |
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logging.error("RPC error in %s on node %s: %s", procedure, name, msg)
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host_result = RpcResult(data=msg, failed=True, node=name,
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call=procedure) |
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results[name] = host_result |
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return results
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def __call__(self, hosts, procedure, body, read_timeout, resolver_opts, |
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_req_process_fn=None):
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"""Makes an RPC request to a number of nodes.
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@type hosts: sequence
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@param hosts: Hostnames
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@type procedure: string
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@param procedure: Request path
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@type body: dictionary
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@param body: dictionary with request bodies per host
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@type read_timeout: int or None
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@param read_timeout: Read timeout for request
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"""
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assert read_timeout is not None, \ |
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"Missing RPC read timeout for procedure '%s'" % procedure
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if _req_process_fn is None: |
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_req_process_fn = http.client.ProcessRequests |
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(results, requests) = \ |
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self._PrepareRequests(self._resolver(hosts, resolver_opts), self._port, |
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procedure, body, read_timeout) |
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_req_process_fn(requests.values(), lock_monitor_cb=self._lock_monitor_cb)
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assert not frozenset(results).intersection(requests) |
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return self._CombineResults(results, requests, procedure) |
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class _RpcClientBase: |
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def __init__(self, resolver, encoder_fn, lock_monitor_cb=None, |
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_req_process_fn=None):
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"""Initializes this class.
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"""
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proc = _RpcProcessor(resolver, |
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netutils.GetDaemonPort(constants.NODED), |
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lock_monitor_cb=lock_monitor_cb) |
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self._proc = compat.partial(proc, _req_process_fn=_req_process_fn)
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self._encoder = compat.partial(self._EncodeArg, encoder_fn) |
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@staticmethod
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def _EncodeArg(encoder_fn, (argkind, value)): |
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"""Encode argument.
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"""
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if argkind is None: |
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return value
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else:
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return encoder_fn(argkind)(value)
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def _Call(self, cdef, node_list, args): |
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"""Entry point for automatically generated RPC wrappers.
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"""
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(procedure, _, resolver_opts, timeout, argdefs, |
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prep_fn, postproc_fn, _) = cdef |
457 |
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if callable(timeout): |
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read_timeout = timeout(args) |
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else:
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read_timeout = timeout |
462 |
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if callable(resolver_opts): |
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req_resolver_opts = resolver_opts(args) |
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else:
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req_resolver_opts = resolver_opts |
467 |
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if len(args) != len(argdefs): |
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raise errors.ProgrammerError("Number of passed arguments doesn't match") |
470 |
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enc_args = map(self._encoder, zip(map(compat.snd, argdefs), args)) |
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if prep_fn is None: |
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# for a no-op prep_fn, we serialise the body once, and then we
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# reuse it in the dictionary values
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body = serializer.DumpJson(enc_args) |
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pnbody = dict((n, body) for n in node_list) |
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else:
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# for a custom prep_fn, we pass the encoded arguments and the
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# node name to the prep_fn, and we serialise its return value
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assert callable(prep_fn) |
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pnbody = dict((n, serializer.DumpJson(prep_fn(n, enc_args)))
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for n in node_list) |
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result = self._proc(node_list, procedure, pnbody, read_timeout,
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req_resolver_opts) |
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if postproc_fn:
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return dict(map(lambda (key, value): (key, postproc_fn(value)), |
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result.items())) |
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else:
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return result
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def _ObjectToDict(value): |
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"""Converts an object to a dictionary.
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@note: See L{objects}.
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"""
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return value.ToDict()
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def _ObjectListToDict(value): |
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"""Converts a list of L{objects} to dictionaries.
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"""
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return map(_ObjectToDict, value) |
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|
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def _EncodeNodeToDiskDict(value): |
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"""Encodes a dictionary with node name as key and disk objects as values.
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"""
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return dict((name, _ObjectListToDict(disks)) |
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for name, disks in value.items()) |
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|
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def _PrepareFileUpload(getents_fn, filename): |
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"""Loads a file and prepares it for an upload to nodes.
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|
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"""
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statcb = utils.FileStatHelper() |
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data = _Compress(utils.ReadFile(filename, preread=statcb)) |
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st = statcb.st |
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if getents_fn is None: |
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getents_fn = runtime.GetEnts |
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getents = getents_fn() |
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return [filename, data, st.st_mode, getents.LookupUid(st.st_uid),
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getents.LookupGid(st.st_gid), st.st_atime, st.st_mtime] |
533 |
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def _PrepareFinalizeExportDisks(snap_disks): |
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"""Encodes disks for finalizing export.
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|
538 |
"""
|
539 |
flat_disks = [] |
540 |
|
541 |
for disk in snap_disks: |
542 |
if isinstance(disk, bool): |
543 |
flat_disks.append(disk) |
544 |
else:
|
545 |
flat_disks.append(disk.ToDict()) |
546 |
|
547 |
return flat_disks
|
548 |
|
549 |
|
550 |
def _EncodeImportExportIO((ieio, ieioargs)): |
551 |
"""Encodes import/export I/O information.
|
552 |
|
553 |
"""
|
554 |
if ieio == constants.IEIO_RAW_DISK:
|
555 |
assert len(ieioargs) == 1 |
556 |
return (ieio, (ieioargs[0].ToDict(), )) |
557 |
|
558 |
if ieio == constants.IEIO_SCRIPT:
|
559 |
assert len(ieioargs) == 2 |
560 |
return (ieio, (ieioargs[0].ToDict(), ieioargs[1])) |
561 |
|
562 |
return (ieio, ieioargs)
|
563 |
|
564 |
|
565 |
def _EncodeBlockdevRename(value): |
566 |
"""Encodes information for renaming block devices.
|
567 |
|
568 |
"""
|
569 |
return [(d.ToDict(), uid) for d, uid in value] |
570 |
|
571 |
|
572 |
#: Generic encoders
|
573 |
_ENCODERS = { |
574 |
rpc_defs.ED_OBJECT_DICT: _ObjectToDict, |
575 |
rpc_defs.ED_OBJECT_DICT_LIST: _ObjectListToDict, |
576 |
rpc_defs.ED_NODE_TO_DISK_DICT: _EncodeNodeToDiskDict, |
577 |
rpc_defs.ED_COMPRESS: _Compress, |
578 |
rpc_defs.ED_FINALIZE_EXPORT_DISKS: _PrepareFinalizeExportDisks, |
579 |
rpc_defs.ED_IMPEXP_IO: _EncodeImportExportIO, |
580 |
rpc_defs.ED_BLOCKDEV_RENAME: _EncodeBlockdevRename, |
581 |
} |
582 |
|
583 |
|
584 |
class RpcRunner(_RpcClientBase, |
585 |
_generated_rpc.RpcClientDefault, |
586 |
_generated_rpc.RpcClientBootstrap, |
587 |
_generated_rpc.RpcClientConfig): |
588 |
"""RPC runner class.
|
589 |
|
590 |
"""
|
591 |
def __init__(self, cfg, lock_monitor_cb, _req_process_fn=None, _getents=None): |
592 |
"""Initialized the RPC runner.
|
593 |
|
594 |
@type cfg: L{config.ConfigWriter}
|
595 |
@param cfg: Configuration
|
596 |
@type lock_monitor_cb: callable
|
597 |
@param lock_monitor_cb: Lock monitor callback
|
598 |
|
599 |
"""
|
600 |
self._cfg = cfg
|
601 |
|
602 |
encoders = _ENCODERS.copy() |
603 |
|
604 |
encoders.update({ |
605 |
# Encoders requiring configuration object
|
606 |
rpc_defs.ED_INST_DICT: self._InstDict,
|
607 |
rpc_defs.ED_INST_DICT_HVP_BEP: self._InstDictHvpBep,
|
608 |
rpc_defs.ED_INST_DICT_OSP: self._InstDictOsp,
|
609 |
|
610 |
# Encoders with special requirements
|
611 |
rpc_defs.ED_FILE_DETAILS: compat.partial(_PrepareFileUpload, _getents), |
612 |
}) |
613 |
|
614 |
# Resolver using configuration
|
615 |
resolver = compat.partial(_NodeConfigResolver, cfg.GetNodeInfo, |
616 |
cfg.GetAllNodesInfo) |
617 |
|
618 |
# Pylint doesn't recognize multiple inheritance properly, see
|
619 |
# <http://www.logilab.org/ticket/36586> and
|
620 |
# <http://www.logilab.org/ticket/35642>
|
621 |
# pylint: disable=W0233
|
622 |
_RpcClientBase.__init__(self, resolver, encoders.get,
|
623 |
lock_monitor_cb=lock_monitor_cb, |
624 |
_req_process_fn=_req_process_fn) |
625 |
_generated_rpc.RpcClientConfig.__init__(self)
|
626 |
_generated_rpc.RpcClientBootstrap.__init__(self)
|
627 |
_generated_rpc.RpcClientDefault.__init__(self)
|
628 |
|
629 |
def _InstDict(self, instance, hvp=None, bep=None, osp=None): |
630 |
"""Convert the given instance to a dict.
|
631 |
|
632 |
This is done via the instance's ToDict() method and additionally
|
633 |
we fill the hvparams with the cluster defaults.
|
634 |
|
635 |
@type instance: L{objects.Instance}
|
636 |
@param instance: an Instance object
|
637 |
@type hvp: dict or None
|
638 |
@param hvp: a dictionary with overridden hypervisor parameters
|
639 |
@type bep: dict or None
|
640 |
@param bep: a dictionary with overridden backend parameters
|
641 |
@type osp: dict or None
|
642 |
@param osp: a dictionary with overridden os parameters
|
643 |
@rtype: dict
|
644 |
@return: the instance dict, with the hvparams filled with the
|
645 |
cluster defaults
|
646 |
|
647 |
"""
|
648 |
idict = instance.ToDict() |
649 |
cluster = self._cfg.GetClusterInfo()
|
650 |
idict["hvparams"] = cluster.FillHV(instance)
|
651 |
if hvp is not None: |
652 |
idict["hvparams"].update(hvp)
|
653 |
idict["beparams"] = cluster.FillBE(instance)
|
654 |
if bep is not None: |
655 |
idict["beparams"].update(bep)
|
656 |
idict["osparams"] = cluster.SimpleFillOS(instance.os, instance.osparams)
|
657 |
if osp is not None: |
658 |
idict["osparams"].update(osp)
|
659 |
for nic in idict["nics"]: |
660 |
nic["nicparams"] = objects.FillDict(
|
661 |
cluster.nicparams[constants.PP_DEFAULT], |
662 |
nic["nicparams"])
|
663 |
return idict
|
664 |
|
665 |
def _InstDictHvpBep(self, (instance, hvp, bep)): |
666 |
"""Wrapper for L{_InstDict}.
|
667 |
|
668 |
"""
|
669 |
return self._InstDict(instance, hvp=hvp, bep=bep) |
670 |
|
671 |
def _InstDictOsp(self, (instance, osparams)): |
672 |
"""Wrapper for L{_InstDict}.
|
673 |
|
674 |
"""
|
675 |
return self._InstDict(instance, osp=osparams) |
676 |
|
677 |
|
678 |
class JobQueueRunner(_RpcClientBase, _generated_rpc.RpcClientJobQueue): |
679 |
"""RPC wrappers for job queue.
|
680 |
|
681 |
"""
|
682 |
def __init__(self, context, address_list): |
683 |
"""Initializes this class.
|
684 |
|
685 |
"""
|
686 |
if address_list is None: |
687 |
resolver = _SsconfResolver |
688 |
else:
|
689 |
# Caller provided an address list
|
690 |
resolver = _StaticResolver(address_list) |
691 |
|
692 |
_RpcClientBase.__init__(self, resolver, _ENCODERS.get,
|
693 |
lock_monitor_cb=context.glm.AddToLockMonitor) |
694 |
_generated_rpc.RpcClientJobQueue.__init__(self)
|
695 |
|
696 |
|
697 |
class BootstrapRunner(_RpcClientBase, _generated_rpc.RpcClientBootstrap): |
698 |
"""RPC wrappers for bootstrapping.
|
699 |
|
700 |
"""
|
701 |
def __init__(self): |
702 |
"""Initializes this class.
|
703 |
|
704 |
"""
|
705 |
_RpcClientBase.__init__(self, _SsconfResolver, _ENCODERS.get)
|
706 |
_generated_rpc.RpcClientBootstrap.__init__(self)
|
707 |
|
708 |
|
709 |
class ConfigRunner(_RpcClientBase, _generated_rpc.RpcClientConfig): |
710 |
"""RPC wrappers for L{config}.
|
711 |
|
712 |
"""
|
713 |
def __init__(self, context, address_list, _req_process_fn=None, |
714 |
_getents=None):
|
715 |
"""Initializes this class.
|
716 |
|
717 |
"""
|
718 |
if context:
|
719 |
lock_monitor_cb = context.glm.AddToLockMonitor |
720 |
else:
|
721 |
lock_monitor_cb = None
|
722 |
|
723 |
if address_list is None: |
724 |
resolver = _SsconfResolver |
725 |
else:
|
726 |
# Caller provided an address list
|
727 |
resolver = _StaticResolver(address_list) |
728 |
|
729 |
encoders = _ENCODERS.copy() |
730 |
|
731 |
encoders.update({ |
732 |
rpc_defs.ED_FILE_DETAILS: compat.partial(_PrepareFileUpload, _getents), |
733 |
}) |
734 |
|
735 |
_RpcClientBase.__init__(self, resolver, encoders.get,
|
736 |
lock_monitor_cb=lock_monitor_cb, |
737 |
_req_process_fn=_req_process_fn) |
738 |
_generated_rpc.RpcClientConfig.__init__(self)
|