root / lib / rpc.py @ b8c160c1
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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 os |
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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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# 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): |
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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:
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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): |
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"""Calculate node addresses using configuration.
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"""
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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))]
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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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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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"""
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results = {} |
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requests = {} |
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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_PUT, str("/%s" % procedure), |
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headers=_RPC_CLIENT_HEADERS, |
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post_data=body, |
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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=None, |
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_req_process_fn=http.client.ProcessRequests): |
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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: string
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@param body: Request body
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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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(results, requests) = \ |
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self._PrepareRequests(self._resolver(hosts), self._port, procedure, |
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str(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 RpcRunner(_generated_rpc.RpcClientDefault, |
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_generated_rpc.RpcClientBootstrap, |
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_generated_rpc.RpcClientConfig): |
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"""RPC runner class.
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"""
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def __init__(self, context): |
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"""Initialized the RPC runner.
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@type context: C{masterd.GanetiContext}
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@param context: Ganeti context
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"""
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# Pylint doesn't recognize multiple inheritance properly, see
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# <http://www.logilab.org/ticket/36586> and
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# <http://www.logilab.org/ticket/35642>
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# pylint: disable=W0233
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_generated_rpc.RpcClientConfig.__init__(self)
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_generated_rpc.RpcClientBootstrap.__init__(self)
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_generated_rpc.RpcClientDefault.__init__(self)
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self._cfg = context.cfg
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self._proc = _RpcProcessor(compat.partial(_NodeConfigResolver,
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self._cfg.GetNodeInfo,
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self._cfg.GetAllNodesInfo),
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netutils.GetDaemonPort(constants.NODED), |
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lock_monitor_cb=context.glm.AddToLockMonitor) |
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def _InstDict(self, instance, hvp=None, bep=None, osp=None): |
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"""Convert the given instance to a dict.
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This is done via the instance's ToDict() method and additionally
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we fill the hvparams with the cluster defaults.
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@type instance: L{objects.Instance}
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@param instance: an Instance object
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@type hvp: dict or None
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@param hvp: a dictionary with overridden hypervisor parameters
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@type bep: dict or None
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@param bep: a dictionary with overridden backend parameters
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@type osp: dict or None
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@param osp: a dictionary with overridden os parameters
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@rtype: dict
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@return: the instance dict, with the hvparams filled with the
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cluster defaults
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"""
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idict = instance.ToDict() |
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cluster = self._cfg.GetClusterInfo()
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idict["hvparams"] = cluster.FillHV(instance)
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if hvp is not None: |
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idict["hvparams"].update(hvp)
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idict["beparams"] = cluster.FillBE(instance)
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if bep is not None: |
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idict["beparams"].update(bep)
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idict["osparams"] = cluster.SimpleFillOS(instance.os, instance.osparams)
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if osp is not None: |
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idict["osparams"].update(osp)
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for nic in idict["nics"]: |
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nic['nicparams'] = objects.FillDict(
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cluster.nicparams[constants.PP_DEFAULT], |
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nic['nicparams'])
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return idict
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def _InstDictHvpBep(self, (instance, hvp, bep)): |
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"""Wrapper for L{_InstDict}.
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"""
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return self._InstDict(instance, hvp=hvp, bep=bep) |
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def _InstDictOsp(self, (instance, osparams)): |
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"""Wrapper for L{_InstDict}.
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"""
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return self._InstDict(instance, osp=osparams) |
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def _Call(self, node_list, procedure, timeout, args): |
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"""Entry point for automatically generated RPC wrappers.
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"""
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body = serializer.DumpJson(args, indent=False)
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return self._proc(node_list, procedure, body, read_timeout=timeout) |
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@staticmethod
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def _MigrationStatusPostProc(result): |
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if not result.fail_msg and result.payload is not None: |
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result.payload = objects.MigrationStatus.FromDict(result.payload) |
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return result
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@staticmethod
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def _BlockdevFindPostProc(result): |
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if not result.fail_msg and result.payload is not None: |
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result.payload = objects.BlockDevStatus.FromDict(result.payload) |
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return result
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@staticmethod
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def _BlockdevGetMirrorStatusPostProc(result): |
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if not result.fail_msg: |
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result.payload = [objects.BlockDevStatus.FromDict(i) |
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for i in result.payload] |
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return result
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@staticmethod
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def _BlockdevGetMirrorStatusMultiPostProc(result): |
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for nres in result.values(): |
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if nres.fail_msg:
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continue
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for idx, (success, status) in enumerate(nres.payload): |
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if success:
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nres.payload[idx] = (success, objects.BlockDevStatus.FromDict(status)) |
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return result
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@staticmethod
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def _OsGetPostProc(result): |
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if not result.fail_msg and isinstance(result.payload, dict): |
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result.payload = objects.OS.FromDict(result.payload) |
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return result
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|
533 |
@staticmethod
|
534 |
def _PrepareFinalizeExportDisks(snap_disks): |
535 |
flat_disks = [] |
536 |
|
537 |
for disk in snap_disks: |
538 |
if isinstance(disk, bool): |
539 |
flat_disks.append(disk) |
540 |
else:
|
541 |
flat_disks.append(disk.ToDict()) |
542 |
|
543 |
return flat_disks
|
544 |
|
545 |
@staticmethod
|
546 |
def _ImpExpStatusPostProc(result): |
547 |
"""Post-processor for import/export status.
|
548 |
|
549 |
@rtype: Payload containing list of L{objects.ImportExportStatus} instances
|
550 |
@return: Returns a list of the state of each named import/export or None if
|
551 |
a status couldn't be retrieved
|
552 |
|
553 |
"""
|
554 |
if not result.fail_msg: |
555 |
decoded = [] |
556 |
|
557 |
for i in result.payload: |
558 |
if i is None: |
559 |
decoded.append(None)
|
560 |
continue
|
561 |
decoded.append(objects.ImportExportStatus.FromDict(i)) |
562 |
|
563 |
result.payload = decoded |
564 |
|
565 |
return result
|
566 |
|
567 |
@staticmethod
|
568 |
def _EncodeImportExportIO((ieio, ieioargs)): |
569 |
"""Encodes import/export I/O information.
|
570 |
|
571 |
"""
|
572 |
if ieio == constants.IEIO_RAW_DISK:
|
573 |
assert len(ieioargs) == 1 |
574 |
return (ieio, (ieioargs[0].ToDict(), )) |
575 |
|
576 |
if ieio == constants.IEIO_SCRIPT:
|
577 |
assert len(ieioargs) == 2 |
578 |
return (ieio, (ieioargs[0].ToDict(), ieioargs[1])) |
579 |
|
580 |
return (ieio, ieioargs)
|
581 |
|
582 |
@staticmethod
|
583 |
def _PrepareFileUpload(filename): |
584 |
"""Loads a file and prepares it for an upload to nodes.
|
585 |
|
586 |
"""
|
587 |
data = _Compress(utils.ReadFile(filename)) |
588 |
st = os.stat(filename) |
589 |
getents = runtime.GetEnts() |
590 |
return [filename, data, st.st_mode, getents.LookupUid(st.st_uid),
|
591 |
getents.LookupGid(st.st_gid), st.st_atime, st.st_mtime] |
592 |
|
593 |
#
|
594 |
# Begin RPC calls
|
595 |
#
|
596 |
|
597 |
def call_test_delay(self, node_list, duration, read_timeout=None): |
598 |
"""Sleep for a fixed time on given node(s).
|
599 |
|
600 |
This is a multi-node call.
|
601 |
|
602 |
"""
|
603 |
assert read_timeout is None |
604 |
return self.call_test_delay(node_list, duration, |
605 |
read_timeout=int(duration + 5)) |
606 |
|
607 |
|
608 |
class JobQueueRunner(_generated_rpc.RpcClientJobQueue): |
609 |
"""RPC wrappers for job queue.
|
610 |
|
611 |
"""
|
612 |
_Compress = staticmethod(_Compress)
|
613 |
|
614 |
def __init__(self, context, address_list): |
615 |
"""Initializes this class.
|
616 |
|
617 |
"""
|
618 |
_generated_rpc.RpcClientJobQueue.__init__(self)
|
619 |
|
620 |
if address_list is None: |
621 |
resolver = _SsconfResolver |
622 |
else:
|
623 |
# Caller provided an address list
|
624 |
resolver = _StaticResolver(address_list) |
625 |
|
626 |
self._proc = _RpcProcessor(resolver,
|
627 |
netutils.GetDaemonPort(constants.NODED), |
628 |
lock_monitor_cb=context.glm.AddToLockMonitor) |
629 |
|
630 |
def _Call(self, node_list, procedure, timeout, args): |
631 |
"""Entry point for automatically generated RPC wrappers.
|
632 |
|
633 |
"""
|
634 |
body = serializer.DumpJson(args, indent=False)
|
635 |
|
636 |
return self._proc(node_list, procedure, body, read_timeout=timeout) |
637 |
|
638 |
|
639 |
class BootstrapRunner(_generated_rpc.RpcClientBootstrap): |
640 |
"""RPC wrappers for bootstrapping.
|
641 |
|
642 |
"""
|
643 |
def __init__(self): |
644 |
"""Initializes this class.
|
645 |
|
646 |
"""
|
647 |
_generated_rpc.RpcClientBootstrap.__init__(self)
|
648 |
|
649 |
self._proc = _RpcProcessor(_SsconfResolver,
|
650 |
netutils.GetDaemonPort(constants.NODED)) |
651 |
|
652 |
def _Call(self, node_list, procedure, timeout, args): |
653 |
"""Entry point for automatically generated RPC wrappers.
|
654 |
|
655 |
"""
|
656 |
body = serializer.DumpJson(args, indent=False)
|
657 |
|
658 |
return self._proc(node_list, procedure, body, read_timeout=timeout) |
659 |
|
660 |
|
661 |
class ConfigRunner(_generated_rpc.RpcClientConfig): |
662 |
"""RPC wrappers for L{config}.
|
663 |
|
664 |
"""
|
665 |
_PrepareFileUpload = \ |
666 |
staticmethod(RpcRunner._PrepareFileUpload) # pylint: disable=W0212 |
667 |
|
668 |
def __init__(self, address_list): |
669 |
"""Initializes this class.
|
670 |
|
671 |
"""
|
672 |
_generated_rpc.RpcClientConfig.__init__(self)
|
673 |
|
674 |
if address_list is None: |
675 |
resolver = _SsconfResolver |
676 |
else:
|
677 |
# Caller provided an address list
|
678 |
resolver = _StaticResolver(address_list) |
679 |
|
680 |
self._proc = _RpcProcessor(resolver,
|
681 |
netutils.GetDaemonPort(constants.NODED)) |
682 |
|
683 |
def _Call(self, node_list, procedure, timeout, args): |
684 |
"""Entry point for automatically generated RPC wrappers.
|
685 |
|
686 |
"""
|
687 |
body = serializer.DumpJson(args, indent=False)
|
688 |
|
689 |
return self._proc(node_list, procedure, body, read_timeout=timeout) |