7 Copyright (C) 2009 Google Inc.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 module Ganeti.HTools.Types
44 -- | The instance index type.
47 -- | The node index type.
50 -- | The type used to hold name-to-idx mappings.
51 type NameAssoc = [(String, Int)]
53 -- | A separate name for the cluster score type.
56 -- | The description of an instance placement.
57 type Placement = ( Idx -- ^ The index of the instance being moved
58 , Ndx -- ^ New primary node
59 , Ndx -- ^ New secondary node
60 , IMove -- ^ The move being performed
61 , Score -- ^ The score of the cluster after this move
64 -- | An instance move definition
65 data IMove = Failover -- ^ Failover the instance (f)
66 | ReplacePrimary Ndx -- ^ Replace primary (f, r:np, f)
67 | ReplaceSecondary Ndx -- ^ Replace secondary (r:ns)
68 | ReplaceAndFailover Ndx -- ^ Replace secondary, failover (r:np, f)
69 | FailoverAndReplace Ndx -- ^ Failover, replace secondary (f, r:ns)
72 -- | Formatted solution output for one move (involved nodes and
74 type MoveJob = ([Ndx], [String])
76 -- | A list of command elements
77 type JobSet = [MoveJob]
79 -- | Connection timeout (when using non-file methods).
83 -- | The default timeout for queries (when using non-file methods).
89 This is similar to the JSON library Result type - *very* similar, but
90 we want to use it in multiple places, so we abstract it into a
99 instance Monad Result where
100 (>>=) (Bad x) _ = Bad x
101 (>>=) (Ok x) fn = fn x
105 -- | Reason for an operation's falure
106 data FailMode = FailMem -- ^ Failed due to not enough RAM
107 | FailDisk -- ^ Failed due to not enough disk
108 | FailCPU -- ^ Failed due to not enough CPU capacity
109 | FailN1 -- ^ Failed due to not passing N1 checks
110 deriving (Eq, Enum, Bounded, Show)
112 -- | List with failure statistics
113 type FailStats = [(FailMode, Int)]
115 -- | Either-like data-type customized for our failure modes
116 data OpResult a = OpFail FailMode -- ^ Failed operation
117 | OpGood a -- ^ Success operation
119 instance Monad OpResult where
120 (OpGood x) >>= fn = fn x
121 (OpFail y) >>= _ = OpFail y
124 -- | A generic class for items that have updateable names and indices.
125 class Element a where
126 -- | Returns the name of the element
127 nameOf :: a -> String
128 -- | Returns the index of the element
130 -- | Updates the name of the element
131 setName :: a -> String -> a
132 -- | Updates the index of the element
133 setIdx :: a -> Int -> a