#
#
-# Copyright (C) 2006, 2007 Google Inc.
+# Copyright (C) 2006, 2007, 2011 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
import collections
import time
import errno
+import logging
+import warnings
from ganeti import serializer
from ganeti import constants
from ganeti import errors
from ganeti import utils
+from ganeti import objects
-KEY_METHOD = 'method'
-KEY_ARGS = 'args'
+KEY_METHOD = "method"
+KEY_ARGS = "args"
KEY_SUCCESS = "success"
KEY_RESULT = "result"
+KEY_VERSION = "version"
REQ_SUBMIT_JOB = "SubmitJob"
REQ_SUBMIT_MANY_JOBS = "SubmitManyJobs"
REQ_CANCEL_JOB = "CancelJob"
REQ_ARCHIVE_JOB = "ArchiveJob"
REQ_AUTOARCHIVE_JOBS = "AutoArchiveJobs"
+REQ_QUERY = "Query"
+REQ_QUERY_FIELDS = "QueryFields"
REQ_QUERY_JOBS = "QueryJobs"
REQ_QUERY_INSTANCES = "QueryInstances"
REQ_QUERY_NODES = "QueryNodes"
+REQ_QUERY_GROUPS = "QueryGroups"
REQ_QUERY_EXPORTS = "QueryExports"
REQ_QUERY_CONFIG_VALUES = "QueryConfigValues"
REQ_QUERY_CLUSTER_INFO = "QueryClusterInfo"
REQ_QUERY_TAGS = "QueryTags"
+REQ_QUERY_LOCKS = "QueryLocks"
REQ_QUEUE_SET_DRAIN_FLAG = "SetDrainFlag"
REQ_SET_WATCHER_PAUSE = "SetWatcherPause"
WFJC_TIMEOUT = (DEF_RWTO - 1) / 2
-class ProtocolError(Exception):
- """Denotes an error in the server communication"""
+class ProtocolError(errors.LuxiError):
+ """Denotes an error in the LUXI protocol."""
class ConnectionClosedError(ProtocolError):
- """Connection closed error"""
+ """Connection closed error."""
class TimeoutError(ProtocolError):
- """Operation timeout error"""
-
-
-class EncodingError(ProtocolError):
- """Encoding failure on the sending side"""
-
-
-class DecodingError(ProtocolError):
- """Decoding failure on the receiving side"""
+ """Operation timeout error."""
class RequestError(ProtocolError):
- """Error on request
+ """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.
class NoMasterError(ProtocolError):
- """The master cannot be reached
+ """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.
except socket.timeout, err:
raise TimeoutError("Connect timed out: %s" % str(err))
except socket.error, err:
- if err.args[0] in (errno.ENOENT, errno.ECONNREFUSED):
+ error_code = err.args[0]
+ if error_code in (errno.ENOENT, errno.ECONNREFUSED):
raise NoMasterError(address)
- if err.args[0] == errno.EAGAIN:
+ 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
"""
if constants.LUXI_EOM in msg:
- raise EncodingError("Message terminator found in payload")
+ raise ProtocolError("Message terminator found in payload")
+
self._CheckSocket()
try:
# TODO: sendall is not guaranteed to send everything
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
- except socket.timeout, err:
- raise TimeoutError("Receive timeout: %s" % str(err))
break
if not data:
raise ConnectionClosedError("Connection closed while reading")
self.socket = None
+def ParseRequest(msg):
+ """Parses a LUXI request message.
+
+ """
+ try:
+ request = serializer.LoadJson(msg)
+ except ValueError, err:
+ raise ProtocolError("Invalid LUXI request (parsing error): %s" % err)
+
+ logging.debug("LUXI request: %s", request)
+
+ if not isinstance(request, dict):
+ logging.error("LUXI request not a dict: %r", msg)
+ raise ProtocolError("Invalid LUXI request (not a dict)")
+
+ method = request.get(KEY_METHOD, None) # pylint: disable-msg=E1103
+ args = request.get(KEY_ARGS, None) # pylint: disable-msg=E1103
+ version = request.get(KEY_VERSION, None) # pylint: disable-msg=E1103
+
+ if method is None or args is None:
+ logging.error("LUXI request missing method or arguments: %r", msg)
+ raise ProtocolError(("Invalid LUXI request (no method or arguments"
+ " in request): %r") % msg)
+
+ return (method, args, version)
+
+
+def ParseResponse(msg):
+ """Parses a LUXI response message.
+
+ """
+ # Parse the result
+ try:
+ data = serializer.LoadJson(msg)
+ except KeyboardInterrupt:
+ raise
+ except Exception, err:
+ raise ProtocolError("Error while deserializing response: %s" % str(err))
+
+ # Validate response
+ if not (isinstance(data, dict) and
+ KEY_SUCCESS in data and
+ KEY_RESULT in data):
+ raise ProtocolError("Invalid response from server: %r" % data)
+
+ return (data[KEY_SUCCESS], data[KEY_RESULT],
+ data.get(KEY_VERSION, None)) # pylint: disable-msg=E1103
+
+
+def FormatResponse(success, result, version=None):
+ """Formats a LUXI response message.
+
+ """
+ response = {
+ KEY_SUCCESS: success,
+ KEY_RESULT: result,
+ }
+
+ if version is not None:
+ response[KEY_VERSION] = version
+
+ logging.debug("LUXI response: %s", response)
+
+ return serializer.DumpJson(response)
+
+
+def FormatRequest(method, args, version=None):
+ """Formats a LUXI request message.
+
+ """
+ # Build request
+ request = {
+ KEY_METHOD: method,
+ KEY_ARGS: args,
+ }
+
+ if version is not None:
+ request[KEY_VERSION] = version
+
+ # Serialize the request
+ return serializer.DumpJson(request, indent=False)
+
+
+def CallLuxiMethod(transport_cb, method, args, version=None):
+ """Send a LUXI request via a transport and return the response.
+
+ """
+ assert callable(transport_cb)
+
+ request_msg = FormatRequest(method, args, version=version)
+
+ # Send request and wait for response
+ response_msg = transport_cb(request_msg)
+
+ (success, result, resp_version) = ParseResponse(response_msg)
+
+ # Verify version if there was one in the response
+ if resp_version is not None and resp_version != version:
+ raise errors.LuxiError("LUXI version mismatch, client %s, response %s" %
+ (version, resp_version))
+
+ if success:
+ return result
+
+ errors.MaybeRaise(result)
+ raise RequestError(result)
+
+
class Client(object):
"""High-level client implementation.
except Exception: # pylint: disable-msg=W0703
pass
- def CallMethod(self, method, args):
- """Send a generic request and return the response.
-
- """
- # Build request
- request = {
- KEY_METHOD: method,
- KEY_ARGS: args,
- }
-
- # Serialize the request
- send_data = serializer.DumpJson(request, indent=False)
-
+ def _SendMethodCall(self, data):
# Send request and wait for response
try:
self._InitTransport()
- result = self.transport.Call(send_data)
+ return self.transport.Call(data)
except Exception:
self._CloseTransport()
raise
- # Parse the result
- try:
- data = serializer.LoadJson(result)
- except Exception, err:
- raise ProtocolError("Error while deserializing response: %s" % str(err))
-
- # Validate response
- if (not isinstance(data, dict) or
- KEY_SUCCESS not in data or
- KEY_RESULT not in data):
- raise DecodingError("Invalid response from server: %s" % str(data))
+ def Close(self):
+ """Close the underlying connection.
- result = data[KEY_RESULT]
+ """
+ self._CloseTransport()
- if not data[KEY_SUCCESS]:
- errors.MaybeRaise(result)
- raise RequestError(result)
+ def CallMethod(self, method, args):
+ """Send a generic request and return the response.
- return result
+ """
+ return CallLuxiMethod(self._SendMethodCall, method, args,
+ version=constants.LUXI_VERSION)
def SetQueueDrainFlag(self, drain_flag):
return self.CallMethod(REQ_QUEUE_SET_DRAIN_FLAG, drain_flag)
break
return result
+ def Query(self, what, fields, filter_):
+ """Query for resources/items.
+
+ @param what: One of L{constants.QR_VIA_LUXI}
+ @type fields: List of strings
+ @param fields: List of requested fields
+ @type filter_: None or list
+ @param filter_: Query filter
+ @rtype: L{objects.QueryResponse}
+
+ """
+ req = objects.QueryRequest(what=what, fields=fields, filter=filter_)
+ result = self.CallMethod(REQ_QUERY, req.ToDict())
+ return objects.QueryResponse.FromDict(result)
+
+ def QueryFields(self, what, fields):
+ """Query for available fields.
+
+ @param what: One of L{constants.QR_VIA_LUXI}
+ @type fields: None or list of strings
+ @param fields: List of requested fields
+ @rtype: L{objects.QueryFieldsResponse}
+
+ """
+ req = objects.QueryFieldsRequest(what=what, fields=fields)
+ result = self.CallMethod(REQ_QUERY_FIELDS, req.ToDict())
+ return objects.QueryFieldsResponse.FromDict(result)
+
def QueryJobs(self, job_ids, fields):
return self.CallMethod(REQ_QUERY_JOBS, (job_ids, fields))
def QueryNodes(self, names, fields, use_locking):
return self.CallMethod(REQ_QUERY_NODES, (names, fields, use_locking))
+ def QueryGroups(self, names, fields, use_locking):
+ return self.CallMethod(REQ_QUERY_GROUPS, (names, fields, use_locking))
+
def QueryExports(self, nodes, use_locking):
return self.CallMethod(REQ_QUERY_EXPORTS, (nodes, use_locking))
def QueryTags(self, kind, name):
return self.CallMethod(REQ_QUERY_TAGS, (kind, name))
+
+ def QueryLocks(self, fields, sync):
+ warnings.warn("This LUXI call is deprecated and will be removed, use"
+ " Query(\"%s\", ...) instead" % constants.QR_LOCK)
+ return self.CallMethod(REQ_QUERY_LOCKS, (fields, sync))
projects / ganeti-local / blobdiff